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MOBILETT XP Digital
SP

Maintenance Instructions
System

incl. DHHS

The protocol SPR8-230.832.30.03.02 is required for

these instructions
01818447

© Siemens AG 2004
The reproduction, transmission or use
of this document or its contents is not
permitted without express written
authority. Offenders will be liable for
damages. All rights, including rights
created by patent grant or registration
of a utility model or design, are
reserved.

Print No.: SPR8-230.831.30.03.02 English

Replaces: SPR8-230.831.30.02.02 Doc. Gen. Date: 11.05
2 Revision / Disclaimer
1Revision / Disclaimer

Document revision level

The document corresponds to the version/revision level effective at the time of system
delivery. Revisions to hardcopy documentation are not automatically distributed.
Please contact your local Siemens office to order current revision levels.

Disclaimer
The installation and service of equipment described herein is to be performed by qualified
personnel who are employed by Siemens or one of its affiliates or who are otherwise
authorized by Siemens or one of its affiliates to provide such services.
Assemblers and other persons who are not employed by or otherwise directly affiliated
with or authorized by Siemens or one of its affiliates are directed to contact one of the
local offices of Siemens or one of its affiliates before attempting installation or service pro-
cedures.

MOBILETT XP Digital SPR8-230.831.30.03.02 Page 2 of 74 Siemens AG

11.05 CS SD 24 Medical Solutions
Table of Contents 3

0 Table of Contents
1 _______ General ________________________________________________________ 5

Performance of work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Special notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Information on product safety and protective measures. . . . . . . . . . . . . . . . . . . . . . . . . . 8
System overview - user . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System overview - Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2 _______ General maintenance information _________________________________ 16

Required documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Required tools, test equipment and aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Material replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Information for the USA only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Explanation of the test items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Information on the protective conductor resistance test . . . . . . . . . . . . . . . . . . . . . . . . . 22
Information on measuring the leakage current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Information on measuring the patient leakage current . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Technical Safety Checks (TSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3 _______ Inspection and maintenance _____________________________________ 36

Visual check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Mechanical inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Back wheels and support rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Front transport wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Brakes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Support arm transport lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Handles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Collimator adjustment knobs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Arm system and single tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Single tank holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Power cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Function inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Operating data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Displaying the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Checking the radiation indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Manual termination of exposure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

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Medical Solutions 11.05 CS SD 24
4 Table of Contents

Collimator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Lamp replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Checking the illuminance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Light field/radiation field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Battery and motor drive inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Motor drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
DAP measuring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Checking the kV/mAs exposure parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
kV accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
mAs accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Reproducibility test (USA only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Checking the image quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Dose measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Contrast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Protective conductor test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Leakage current measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Patient leakage current measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

4 _______ Changes to previous version _____________________________________ 73

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11.05 CS SD 24 Medical Solutions
General 5
1-
1 General

1.1 Performance of work

Any technician duly assigned by the local Siemens office is authorized to perform mainte-
nance and service work.
U Certain tasks may also be performed by other technical personnel (e.g. the customer's
hospital technicians). These tasks are marked by the icon shown here.
In such cases it is absolutely necessary:
• to observe all instructions in the text and graphics;
• to use the specified tools, test equipment and aids.
You can also contact your national Siemens Uptime Service Center for support.

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Medical Solutions 11.05 CS SD 24
6 General

1.2 Special notes

DANGER An immediate danger that will cause death or serious physical in-
jury if disregarded.
¹

WARNING A danger that can cause death or serious physical injury if disre-
garded.
¹

CAUTION A danger that will or can lead to minor or moderate physical injury
and/or damage to property if disregarded.
¹

NOTICE A danger that will or can lead to an undesirable result or state other
than death, physical injury or property damage.
¹

NOTE Information that explains the proper way to use devices or to carry
out a process, i.e., provides pointers and tips.

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11.05 CS SD 24 Medical Solutions
General 7

1.3 Icons

X Warning about ionizing radiation or radioactive substances. Tests and adjustments that
must be performed with the radiation switched on are indicated by this radiation warning
icon.
.
V Dangerous electrical voltage > 25 V~ or > 60 V-.

C Caution! General hazard warning.

E ESD: Warning about electrostatically sensitive components.

P Report icon. Used to indicate entries in certificates.

U Certain tasks can also be performed by other technical personnel (e.g. the customer's
hospital technicians).

Certain sections apply only to the USA. These sections are marked with this icon.

Fig. 1:

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Medical Solutions 11.05 CS SD 24
8 General

1.4 Information on product safety and protective measures

DANGER While performing maintenance and service work
on the MOBILETT XP digital with open covers,
it is possible to come into contact with components under voltage.

Carelessness can result in death or serious bodily injury.

When conducting maintenance and service work, follow:

¹ the product-specific safety information contained in the
technical documentation,
¹ and the general safety information (TD00-000.860.01...).

DANGER Remove or install components only if:

¹ - The system is switched off, and
¹ - The capacitors are discharged, and
¹ - The ESD guidelines are followed, and
¹ - The batteries have been disconnected.

DANGER Releasing radiation:

¹ Checks and settings for which radiation must be
released are to be marked with the radiation warning
symbol.
¹ Radiation protection measures are to be used.

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11.05 CS SD 24 Medical Solutions
General 9

DANGER To avoid electrical shock from components under voltage, also be

aware that:
The capacitors of the capacitor bank can be electrically charged
even when the system is switched off and the power cable is dis-
connected!
In the case of an error, individual capacitors of the capacitor bank
can still be electrically charged when disconnected from the
charging circuit!
Disconnect the battery blocks in the XP Digital prior to mainte-
nance and service work!

Carelessness can result in death or serious bodily injury.

¹ Make sure that no parts or tools fall into the unit;

¹ Do not touch potentially dangerous
components(Fig. 2 / p. 10)
¹ If loose parts must be removed from the unit, use only
insulated tools;
¹ Protect the work area so that no other persons are able
touch the unit while the covers are open!

• Switch the unit off before servicing or maintenance. Always disconnect the power plug
first.
• Ensure that the main switch is turned off.
• The capacitor bank discharges to < 40 V in approx. 15 minutes.
¹ The safety covers can be removed after this period has elapsed.
• Prior to performing any work, it must be verified that areas with dangerous voltage are
voltage-free (Fig. 2 / p. 10).

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Medical Solutions 11.05 CS SD 24
10 General

Fig. 2: Locations with dangerous voltage

V With the housing covers open and safety covers removed:
Back:

CAUTION: DC voltage (440V) at capacitor bank (D927)

CAUTION: DC voltage (300 V) from the battery block to PCB D982!

Always disconnect the battery plug from BK1-BK4.

Left:

CAUTION: DC voltage (440V) directly at the capacitor bank!

Right:

CAUTION: DC voltage (440V) directly at the capacitor bank!

CAUTION: AC voltage (> 100V or > 60V half line voltage) at power supplies
U1 and U2 as long as the power cord is connected.

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11.05 CS SD 24 Medical Solutions
General 11

1.5 System overview - user

Fig. 3: User overview

(1) Hanger for lead apron (13) Rollers

(2) Articulated arm (14) Console with chassis
(3) Sensor for IR remote control (optional) (15) IR remote control (optional)
(4) DAP display (optional) (16) Holder for IR remote control (optional)
(5) Exposure switch (S27) (17) Potential equalization connector
(6) Control panel and display field (18) Transport safety device
(7) Transport handle/motor control (19) Stand column
(8) Hand/parking brake handle (20) DAP ionization chamber (optional)
(9) Main switch (21) Collimator
(10) Power cable (22) X-ray tube assembly
(11) Brake handle for cable winch (23) Light localizer buttons (two sides)
(12) CXDI-50G detector holder n.a.

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Medical Solutions 11.05 CS SD 24
12 General

1.6 Orientation

Fig. 4: Top view of system_01

System orientation to clarify the technical description

Abbreviations Explanation
Uv User view - back (User view)
L Left side of unit (left)
R Right side of unit (right)
F Front (front)
fw Front wheels (front wheels)
sa Support arm (support arm)
T Tube (single tank)
C Collimator (collimator)
dd DAP display (dose display)

NOTE These orientation indicators are used in all technical documents.

Descriptions are always from the “forward travel” user view. Al-
ways use this perspective when communicating with third parties
(e.g., USC/HSC).

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11.05 CS SD 24 Medical Solutions
General 13

1.7 System overview - Service

Fig. 5: Schematic overview of XP Digital

MOBILETT XP Digital parts

Abbreviations Explanation
D916/D919 CPU board/X-ray interface
D 917 Galvanic separation for S27/DAP/remote
Rcb Remote control board (remote control option)
SW1 Key switch, power ON/OFF
Z1 Line filter
C1 (R1) Capacitor for inverter with discharge resistor (front left side/not
shown here)
C2 (R2) Starter capacitor with discharge resistor
R3-R5, R6 (X9) Capacitor bank discharge resistor (front right side)
Capacitor bank 12 x 10 mF capacitors, mounted on D972
K22 Main relay

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Medical Solutions 11.05 CS SD 24
14 General

D909 X-ray display and keyboard

U1 +5V/± 15V power supply
U2 +24V power supply
D927 Power supply
D952 Capacitor bank charging board (behind D927)
D962 kV inverter (behind D927)
D972 Capacitor bank board (behind D927)
Sa Support arm adjusting spring
lw/rw/sw Support rollers and back wheels
D982 Battery charger
D102 Motor drive control
BK1/BK2 Battery block, left
BK3/BK4 Battery block, right
mr/ml Motor right/motor left
CXDI PC Laptop for the imaging system
CXDI detector CXDI flat detector
Power box Connecting unit between CXDI PC and CXDI detector
U3 DC converter 300V DC/24V DC
U4 Inverter 24V DC/220V AC
U5 Power supply CXDI PC (laptop)
Optional parts for MOBILETT XP Digital (not shown in illustration)
DAP chamber Dose area product measuring chamber
D991 DAP adapter board (within the collimator cover)
DAP display DAP display board (in the lower arm segment cover)

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11.05 CS SD 24 Medical Solutions
General 15

1.8 Cleaning
• Always disconnect the MOBILETT from the power supply and switch it off before clean-
ing or disinfecting it.
• Never use abrasive cleaners or cleaning agents with solvents (e.g. cleaning solutions,
alcohol or spot removers), since they may damage housing surfaces.
• Do not spray anything on or into the unit.
• Wipe off the MOBILETT with a cloth moistened in water or a diluted, lukewarm solution
of water and dishwashing liquid.
For more information, see the Chapter on "Cleaning and disinfection” in the operating
instructions.

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Medical Solutions 11.05 CS SD 24
16 General maintenance information
2-
2 General maintenance information

2.1 Required documents

• General safety information TD00-000.860.01...

• Startup instructions SPR8-230.814.30...
• Quality assurance SPR8-230.820.30...
• Instructions for part replacement SPR8-230.841...
• Troubleshooting instructions SPR8-230.840....
• Wiring diagram SPR8-230.844.30...
• Operator manual SPR8-230.621.30..
• Technical safety checks/protocol* SP00-000.834.01..

* Within the purview of DIN VDE 075-1, we recommend documenting the results of the
maintenance both in the maintenance protocol and in the TSC protocol. The protocols
should be filled out completely and handed over to the client after maintenance is com-
plete.

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11.05 CS SD 24 Medical Solutions
General maintenance information 17

2.2 Required tools, test equipment and aids

• Standard service tool kit

• Measuring device for leakage current and patient leak- 51 38 727 Y0766
age current, e.g.:
• Ground wire tester or e.g.: 51 38 727 Y0766
• 2.1 mm precision copper filter (or alternatively, copper 90 00 598 RV090
filter set 4406 120 RV090)
• Dose meter, e.g.: PTW DIADOS 97 17 612 Y0388
• Densitometer, e.g., DensiX-LE 52003 49 51 286 Y0388
• Digital multimeter, e.g.: Fluke 8060 A 97 02 101 Y4290
• Centering cross 96 60 051 RE999
• mAs meter (e.g.: 81 60 400) or 2-channel storage oscil-
loscope with ± -2.5% accuracy
• kV meter (works with the filter comparison method) or
2-channel storage oscilloscope with +/- 2.5% accuracy
• 2-channel storage oscilloscope with 2.5% accuracy, 73 92 074
e.g.: Fluke Scope Meter 199 CM
• Spring balance for 350 N
• Torque wrench for 8-40 Nm, e.g.: 99 00 846 RE999
• Calibration tool for the "DAP measurement system" op- 65 84 978
tion
• Adjuster for tensioning the drive belt 65 64 301
• Rope (min. length 4 m; min. tensile strength 1000 N)
• Loctite 242
• Viscogen oil
• 2 pieces of wood, approx. 50 x 75 x 500 mm

• Lux meter (USA only)

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Medical Solutions 11.05 CS SD 24
18 General maintenance information

2.3 Material replacement

Material Material no. Interval

Collimator lamp 08392016 12 months
Battery pack (left) BK1/BK2 08392024 24 months
Battery pack (right) BK3/BK4 08392032 24 months
Cable winch complete 06508746 48 months
Option
Remote control batteries 1x9V alkaline 12 months

Replace damaged or missing screws.

NOTE Only replace damaged or missing screws with steel screws.

All Allen screws must have a tensile strength of 8.8.

Materials needed for periodic replacement can be requested from the responsible local
Uptime Service Center.

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11.05 CS SD 24 Medical Solutions
General maintenance information 19

2.4 Log
The maintenance protocol must be completed and signed. Replacement and repair mea-
sures must be listed separately in the protocol under “Work procedures performed”.

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Medical Solutions 11.05 CS SD 24
20 General maintenance information

2.5 Information for the USA only

To ensure compliance with the applicable regulations in the "US Federal Perfor-
mance Standard", the user of the MOBILETT XP Digital is responsible for perform-
ing maintenance procedures at least once each year.
Neither the system manufacturer nor its representatives assume any responsibility
in the event of non-compliance with the above requirements.

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11.05 CS SD 24 Medical Solutions
General maintenance information 21

2.6 Explanation of the test items

Test item Explanation

Abbreviation
SI Safety inspection
SIE Electrical safety inspection
SIM Mechanical safety inspection
PM Preventive Maintenance
PMP Periodic preventive maintenance
PMA Preventive maintenance adjustments
PMF Preventive maintenance function, check operating values
Q Quality check
QIQ Image quality test
QSQ System quality test
SW Software maintenance

The maintenance protocol lists these abbreviations for the test items.

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Medical Solutions 11.05 CS SD 24
22 General maintenance information

2.7 Information on the protective conductor resistance test

Observe the instructions in the "Safety Rules for Installation and Repair"
(ARTD-002.731.17 ...).
The protective conductor resistance must be measured, documented, and evaluated dur-
ing maintenance.

NOTE For evaluation purposes, the first measured value and the values
documented during maintenance or safety checks must be com-
pared to the measured values. A sudden or unexpected increase
in the measured values may indicate a defect in the protective con-
ductor connections - even if the limit value of 0.2 ohms is not ex-
ceeded. (Protective conductor or contacts).

The measurement must be performed according to DIN VDE 0751, Part 1 (see ARTD
Part 2). The protective conductor resistance for all touchable conductive parts must be
measured during the normal operating state of the system.
Make sure that control cables or data cables between the components of the system are
not mistaken for protective conductor connections.
During the measurement, move the power cable and additional connection cables with an
integrated protective conductor section by section to detect cable breaks.
The protective conductor resistance must not exceed 0.2 Ohms.

Fig. 1: Measuring circuit for measuring the protective conductor resistance for units that are
disconnected from power, in compliance with DIN VDE 0751-1/2001-10, Fig. C2.
Pos. 1 = System
Pos. 2 = Application part type B (if available)
Pos. 3 = Measurement setup (integrated into measuring device)

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11.05 CS SD 24 Medical Solutions
General maintenance information 23

The values determined, including the measuring points, must be recorded and assessed
in the protective conductor resistance report.
The measuring procedure and the measuring device used (designation and serial num-
ber) must also be documented.

NOTE File the protective conductor resistance report in the "Certificates"

register no. 9 in the system binder.

NOTE A new report must be created if the protective conductor resis-

tance measurements are not documented.
A new protective conductor resistance report can be found in the
startup instructions SPR8-230.814.30.03. Separate this report from
these instructions, fill it out, and file it in the "Certificates" register
no. 9 in the system binder. If values are newly determined, they
must be recorded as first measured values. The evaluation is omit-
ted in this case.

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24 General maintenance information

2.8 Information on measuring the leakage current

NOTE During maintenance, the leakage current measurement must be
conducted and recorded as a repeat measurement.
However, the first measured value must be newly determined and
a new report be must created under the following conditions:
- Lack of documentation for leakage current measurement
- Deviation of the local line voltage from the line voltage document-
ed in the report (e.g., location change/operator change)
- When a different procedure for measuring the leakage current
than the one documented in the report is used.
For the purpose of traceability, reference to the new report must be
written in the old report. The reason for newly determining the first
measured value must be documented and confirmed with a name
and signature.

Observe the instructions in the "Safety Rules for Installation and Repair"
(ARTD-002.731.17 ...).

WARNING Electrical voltage!

Non-compliance can lead to severe injury and even death.
¹ The leakage current measurement may be performed on
systems of protection class I only after the protective
conductor test has been passed.

First measured value

The first measured value has already been determined and documented in the leakage
current report. The measuring procedure was also recorded.
The measurement was performed with the recorded line voltage and with the recorded
measuring equipment.

Measurement
Perform the measurement according to DIN VDE 0751, Part 1 (see ARTD-002.731.17....),
and record the determined value.
The measuring procedure indicated in the report must be used.
If the first measured value has to be newly determined (see previous information), a mea-
suring procedure can be selected (direct measurement or differential measurement).
Measurement of the leakage current according to the differential current method (mea-
surement setup according to (Fig. 2 / p. 25)) must be given preference, since this method
is not dangerous to the person performing the measurement and other persons.

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General maintenance information 25

However, please note the minimum resolution of the leakage current measuring device
and any additional manufacturer information restricting the use of the measuring device.

Fig. 2: Measuring circuit for measuring the system leakage current according to the differential
current method in compliance with DIN VDE 0751-1/2001-10, Fig. C6 for protection
class I.
Pos. 1 = System
Pos. 2 = Application part type B (if available)
Pos. 3 = Measurement setup (integrated into measuring device)

If the direct measurement of the leakage current is used (measurement setup according
to (Fig. 3 / p. 26)), the system must be insulated during the measurement and must not be
touched.

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26 General maintenance information

Fig. 3: Measuring circuit for direct measurement of the system leakage current in compliance
with DIN VDE 0751-1/2001-10, Fig. C5 for protection class I.
Pos. 1 = System
Pos. 2 = Application part type B (if available)
Pos. 3 = Measurement setup (integrated into measuring device)

WARNING Electrical voltage!

Non-compliance can lead to severe injury and even death.
¹ No housing parts of the system may be touched during
direct measurement of the leakage current (measure-
ment setup according to (Fig. 3 / p. 26)).
¹ Third-person access to the system must be prevented.

The system must be switched on during measurement. Measuring devices with auto-
mated measuring sequences must therefore be set to manual measurement.

Enter the highest value in the leakage current report .

This value must not exceed the permissible leakage current values according to DIN VDE
0751-1/2001-10, Table F.1, line "leakage current for devices according to remarks 1 and
3", of 2.5 mA.
Measure and record the current line voltage. If the measured line voltage deviates from
the nominal voltage, correct the measured value to the value corresponding to a mea-
surement at the nominal value of the line voltage. This must also be documented.

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Document the measuring procedure (differential measurement or direct measurement)

and the measuring device used (designation and serial number).

In the case of repeat measurements, the measured value must also be evaluated.

NOTE For evaluation purposes, the first measured value and the values
documented during maintenance or safety checks must be com-
pared to the measured values. A sudden or unexpected increase
in the measured values may indicate that a fault has occurred in
the primary power supply circuit (insulation damage, damage from
moisture, defective interference suppressor, etc.) - even if the limit
value of 2.5 mA is not exceeded.

The evaluation is not necessary in the case of a new determination.

NOTE File the leakage current report in the "Certificates" register no. 9 in
the system binder.

NOTE A new report must be created if the leakage current measurements

are not documented.
A new leakage current report can be found in the startup instruc-
tions SPR8-230.814.30.03. Separate this report from these instruc-
tions, fill it out, and file it in the "Certificates" register no. 9 in the
system binder. If values are newly determined, they must be re-
corded as first measured values. The evaluation is omitted in this
case.

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28 General maintenance information

2.9 Information on measuring the patient leakage current

Observe the instructions in the "Safety Rules for Installation and Repair"
(ARTD-002.731.17 ...).
On systems of protection class I with type B application part, the patient leakage current
must be measured, documented, and evaluated during maintenance on each application
part.
If the application part has a surface of non-conductive material, it must be covered with a
conductive material (such as aluminum foil). The conductive surface must be large
enough to approximate the contact surface of the patient with the application part.
With a flat detector, completely cover the contact surface with aluminum foil.
Hold the aluminum foil securely to the application part to be measured using approx. 0.5
N/cm2 of pressure during the measurement.

WARNING Electrical voltage!

Non-compliance can lead to severe injury and even death.
¹ The patient leakage current measurement may be per-
formed on systems of protection class I only after the
protective conductor test has been passed.

First measured value

The first measured values have already been determined and documented in the patient
leakage current report.
The measuring procedure and the measuring device used (designation and serial num-
ber) have been documented as well.

Measurement
The patient leakage current must be measured for each application part.
The measurement must be made according to DIN VDE 0751, Part 1 (see
ARTD-002.731.17...).

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General maintenance information 29

Fig. 4: Measuring circuit for measurement of the patient leakage current in a type B application
part with a protective conductor in compliance with DIN VDE 0751-1/2001-10, Fig. C10.
Pos. 1 = System
Pos. 2 = Application part type B
Pos. 3 = Measurement setup (integrated into measuring device)

The system must be switched on during measurement. Measuring devices with auto-
mated measuring sequences must therefore be set to manual measurement.
The same measuring conditions as in the first measurement apply.
The values determined in the repeat measurement, including the application parts/mea-
suring points, must be recorded and assessed in the patient leakage current report.
The values for each application part may not exceed the permissible leakage current val-
ues according to DIN VDE 0751-1/ 2001-10, table F.1, line "patient leakage current" of
0.01 mA for direct current and 0.1 mA for alternating current.
Document the measuring procedure and the measuring device used (designation and
serial number).
In the case of repeat measurements, the measured values must also be evaluated.

NOTE For evaluation purposes, the first measured value and the values
documented during maintenance or safety checks must be com-
pared to the measured values. A sudden or unexpected increase
in the measured values may indicate a defect in the system (pro-
tective conductor connection damage, insulation damage, dam-
age from moisture, etc.) - even if the limit value of 0.01 mA for
direct current and 0.1 mA for alternating current is not exceeded.

The evaluation is not necessary in the case of a new determination.

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30 General maintenance information

NOTE File the patient leakage current report in the "Certificates" register
no. 9 in the system binder.

NOTE A new report must be created if the patient leakage current mea-
surements are not documented.
A new patient leakage current report can be found in the startup in-
structions SPR8-230.814.30.03. Separate this report from these in-
structions, fill it out, and file it in the "Certificates" register no. 9 in
the system binder. If values are newly determined, they must be re-
corded as first measured values. The evaluation is omitted in this
case.

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General maintenance information 31

2.10 Technical Safety Checks (TSC)

Abbreviation: TSC = Technical Safety Checks

NOTE Within the purview of DIN VDE 0751-1, the operator of medical en-
gineering products has to perform technical safety checks at reg-
ular intervals.
The checks listed in these maintenance instructions include all
technical safety checks required by DIN VDE 0751-1.
A separate protocol with the print number SP00.000.834.01... is
available for each technical safety check.
Within the purview of DIN VDE 0751-1, we recommend document-
ing the maintenance results both in the maintenance protocol and
in the TSC protocol. The protocols should be filled out completely
and handed over to the client after maintenance is complete.
The table below assigns each technical safety check listed in doc-
ument SP00.000.834.01... to the corresponding maintenance work.

Test report/ Maintenance instructions for the

Technical safety checks check/comments

1. Identification data n.a.

2. General checks n.a.
2.1 Visual inspection: Is there any dam- 3.1.1 Damage, checks:
age affecting safety? SIM Covers
SIM Detector/cassette holder
SIM Control and display panel
SIM Release cable
SIM Single tank
SIM Collimator
2.2 Are all cables and cable guides 3.2.9 Power cable, checks:
secure and without any visible damage? SIM Power cable check
SIM General cable winch information
3.2.9.1 Power plug, check:
SIM Power plug check
3.2.7.5 Cable harness for the arm system,
check:
SIM Damage-free

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32 General maintenance information

Test report/ Maintenance instructions for the

Technical safety checks check/comments

2.3 Are undamaged accessories being 3.1.1 Damage, check:

used? SIM DAP (optional)
SIM Remote control (optional)
2.4 System radiation protection devices 3.3.3 Check of the radiation indicator,
present and undamaged? (No on-site checks:
radiation shield) SIE Radiation indicator
SIE Ready indicator
SIE Acoustic signal
3.3.4 Manual termination of exposure,
checks:
SIE "ERR 39" display
SIE Acoustic signals
2.5 Are the required operator documents 3.1 Visual inspection, check:
complete, present and legible? SI Customer documentation
Ask the customer for additional required
operator documents and check them for
completeness, availability, and legibility.
2.6 Are all warning labels in place and 3.1 Visual inspection, check:
recognizable? SIM Signs
2.7 Are the operating symbols, light indi- 3.3.2 Control panel displays, checks:
cators and button labels OK? SIE kV/mAs 7-segment displays
SIE kV/mAs displays according to operating
instructions
3. Electrical checks n.a.
3.1 Measurement of ground wire resis- 3.10 Protective conductor test, check:
tance SIE Protective conductor test
3.2 Leakage current or equivalent leak- n.a.
age current measurement
3.2.1 Leakage current measurement 3.11 Leakage current measurement, check:
SIE Leakage current measurement
3.2.2 Equivalent leakage current mea- n.a.
surement
3.3 Patient leakage current or equivalent n.a.
patient leakage current measurement

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General maintenance information 33

Test report/ Maintenance instructions for the

Technical safety checks check/comments

3.3.1 Patient leakage current measure- 3.12 Patient leakage current measurement,
ment check:
SIE Patient leakage current measurement
3.3.2 Equivalent patient leakage current n.a.
measurement
4. Mechanical checks n.a.
4.1 Are all wall, ceiling and floor mount- n.a.
ings secure and undamaged?
4.2 Are all mechanically moved system 3.2.4 Support arm transport lock, checks:
parts clean and running smoothly (lubri- SIM Transport lock check
cated, if required)?
SIM Locking mechanism
3.2.7.1 Movement of the arm system,
checks:
SIM Movement of the arm system
SIM Movement of the single tank holder
SIM Movement of the single tank
4.3 Cables, chains, belts, and spindles 3.2.1.1 Back wheels, checks:
without signs of wear? SIM Drive belts
4.4 Mobile equipment: Are the wheels, 3.2.1.1 Back wheels, check:
rollers and brakes OK? SIM Brake pad
SIM Secure attachment
SIM Smooth rotation
3.2.1.2 Support rollers, checks:
SIM Secure attachment
SIM Smooth rotation
3.2.2 Front transport wheels, checks:
SIM Secure attachment
SIM Smooth rotation
3.2.3 Brakes, checks:
SIM Uniformity
SIM Braking force
4.5 Is there any unusual noise during 3.2.7.1 Movement of the arm system,
operation (e.g. gearing)? checks:
SIM Movement of the arm system
5. Functional checks n.a.

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34 General maintenance information

Test report/ Maintenance instructions for the

Technical safety checks check/comments

5.1 Function of the emergency-stop n.a.

switch
5.2 Are the warning devices functioning 3.3.3 Check of the radiation indicator,
properly? checks:
SIE Radiation indicator
SIE Ready indicator
SIE Acoustic signal
5.3. Do all system movements stop prop- n.a.
erly in their end positions?
5.4 Does the collision protection device n.a.
stop all system movements properly (e.g.
collision protection)?
5.5. Are all safety distances (wall, floor, n.a.
ceiling) met or ensured by other appropri-
ate measures (such as light barriers)?
5.6. Are the other safety shutdown n.a.
devices functioning properly (e.g. safety
floor plate)?
5.7 Are the positions of the table and sys- n.a.
tem reproducible (e.g. zero positions,
layer height, etc.)?

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General maintenance information 35

Test report/ Maintenance instructions for the

Technical safety checks check/comments

6. Product-specific checks 3.2.5 Handles, check:

SIM Attachment
3.2.6 Collimator adjustment knobs, check:
SIM Attachment
3.2.7.2 Arm system attachment, check:
SIM Screws and lock nuts
3.2.7.3 Arm connector, check:
SIM Screws and nuts
3.2.7.4 Adjusting screw and cantilever,
checks:
SIM Lock nuts
SIM Attachment of the base
3.2.7.8 Single tank holder, checks:
SIM Holder screw connections
SIM Single tank screw connections
3.6.1 DAP measuring system (optional),
check:
SIE Function of the DAP measuring system
3.6.2 Remote control (optional), check:
SIE Function of the remote control
7. Check results/evaluation: Evaluate the long-term trends of the ground
wire resistance and the leakage current by
comparing the current measuring values to
those of the preceding technical safety
checks. A sudden or unexpected increase in
the measured values may indicate a
safety-related defect - even if the limit val-
ues are not exceeded.
Enter the results of the check.
Have the operator, or a person authorized
by the operator, sign the TSC protocol.
Hand the TSC protocol over to the operator,
or a person authorized by the operator.

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36 Inspection and maintenance
3-
3 Inspection and maintenance

3.1 Visual check

SIM Signs
• Check all signs on the system with the model and serial numbers as well as warnings.
The placement of these signs is described in the operating instructions ("Signs" chap-
ter).
• Verify that all signs are present and legible.
SI Customer documentation
• The customer must be able to provide the following documents. The documents are to
be checked for availability, completeness, and legibility.
- Operating instructions
- Start-up protocol
- Last maintenance protocol
- Quality assurance protocol

- Maintenance records
- Service reports for repairs and adjustments
- DHHS documentation

3.1.1 Damage
• Check the unit for external damage (cracks, breaks, scratches, corrosion etc.).
• Check whether the single tank or the collimator show any signs of mechanical defects
that can impair radiation protection.
• Repair or replace defective parts.
SIM Covers
SIM Detector and detector holder
• Check the condition of the detector side covers and replace them if necessary.
SIM Control panel and display panel
SIM Release cable
SIM Single tank
SIM Collimator
SIM DAP (optional)
• The DAP ionization chamber should not have any scratches.
• No damage to DAP supply line, plug or display
SIM Remote control (optional)
• No damage to remote control

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3.2 Mechanical inspection

WARNING There is a danger of life-threatening electrical shock. It is possible
to come into contact with live parts when the covers are removed.
Carelessness can result in death or serious bodily injury.
¹ Follow the general and product-specific protective mea-
sures.

3.2.1 Back wheels and support rollers

NOTE First perform the following work steps listed in the "Back wheels
and support rollers" section one one side. Then check the other
side in the same manner.

• Elevate one side of the system by placing a piece of wood under the chassis
(Fig. 1 / p. 37).
• Secure the wheel on the other side with 2 blocks. Ensure that the MOBILETT XP Digital
is secure!
• Remove the wheel cap and wheel (Fig. 1 / p. 37).

Fig. 1: Braked wheels

3.2.1.1 Back wheels

SIM Brake pad
• Check the brake pad (Fig. 2 / p. 38). The brake pad must be > 1mm. If worn (pad <
1mm), replace the brake according to the "Replacement of parts" instructions.
SIM Drive belt

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38 Inspection and maintenance

• Check the condition/tension of the drive belt (Fig. 1 / p. 37) (the adjustment procedure
for the drive belt is described in the "Replacement of parts" instructions).

NOTE Under normal operating conditions, the drive belt does not need to
be readjusted during the life of the system.

SIM Secure attachment

• Securely reattach the wheel.
SIM Smooth rotation
• Ensure smooth rotation of the wheel.

Fig. 2: Smooth rotation

3.2.1.2 Support rollers

• Lock the back transport wheels with the parking brake.
• Elevate one side of the system.
SIM Secure attachment
• Ensure attachment of the support rollers (Fig. 3 / p. 39).
SIM Smooth rotation
• Ensure smooth rotation of the rollers (Fig. 3 / p. 39).

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Inspection and maintenance 39

Fig. 3: Rollers
.

3.2.2 Front transport wheels

• Lock the back transport wheels with the parking brake.
• Elevate the front transport wheels with a piece of wood (Fig. 4 / p. 39).
SIM Secure attachment
• Ensure attachment of the wheels.
SIM Smooth rotation
• Ensure smooth rotation of the wheels.

Fig. 4: Raise the front of the system

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40 Inspection and maintenance

Fig. 5: Installing the front transport wheels

3.2.3 Brakes
SIM Uniformity
• The brake pad should not rub during transport.
• Brake the system during transport.
¹ The system should not pull to one side during braking.
SIM Braking force
• Activate the brake.
• Use the spring balance to pull the system forward and backward.
¹ The system should not move under 350N (adjusting the brakes is described in
the "Replacement of parts" instructions).

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Inspection and maintenance 41

Fig. 6: Hand brake

3.2.4 Support arm transport lock

SIM Checking transport lock
• Check the transport lock for mechanical defects. Replace lock, if damaged.
SIM Locking mechanism
• Verify that the support arm handle engages securely in the transport lock.

Fig. 7: Support arm and transport safety lock handle

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42 Inspection and maintenance

3.2.5 Handles
SIM Attachment
• Verify that the support arm and collimator handles are undamaged and securely at-
tached. Tighten screws and replace defective parts as necessary.

Fig. 8: Collimator handle

3.2.6 Collimator adjustment knobs

SIM Attachment
• Verify that the collimator adjustment knobs are properly seated.

3.2.7 Arm system and single tank

3.2.7.1 Moving the arm system

SIM Moving the arm system
• Move the support arm into all the usual positions. The arm should not move up or down
after you release it. (To adjust the friction brakes, refer to the "Replacement of parts" in-
structions).
SIM Moving the single tank holder
• The single tank holder must be easy to turn and maintain any position.
SIM Moving the single tank
• The single tank must be easy to turn and maintain any position.

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Fig. 9: Arm system

3.2.7.2 Arm system attachment

• Remove the top and bottom arm covers from the column.
SIM Screws and lock nuts
• Check that the screws and lock nuts are seated securely (Fig. 10 / p. 44).

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44 Inspection and maintenance

Fig. 10: Arm system attachment

3.2.7.3 Arm connector

• Remove the covers from the bottom arm articulation.

NOTE For easier reassembly, note the disassembly sequence.

SIM Screws and nuts

• Check that the screws and nuts are seated securely .

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3.2.7.4 Adjusting screw and cantilever

WARNING Uncontrolled system movements pose danger of injury.

The support can fall if the adjusting screws are unscrewed incor-
rectly!

¹ Carelessness can result in death or serious bodily injury.

SIM Lock nuts

• Verify that the lock nuts on the adjusting screw are properly seated (Fig. 11 / p. 45).
SIM Attaching the base
• Verify that the base attachment in the chassis is secure (Fig. 11 / p. 45).

Fig. 11: Adjusting screw and cantilever attachment

3.2.7.5 Cable harness for the arm system

SIM Undamaged
• Check all support arm cabling for damage (stretching, twisting, insulation cracks). Pay
special attention to the stress points of moving elements (Fig. 12 / p. 46).
• Replace any damaged cables.

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46 Inspection and maintenance

Fig. 12: Cable stress points

3.2.8 Single tank holder

SIM Holder screw connections
• Verify that the screw connections on the support arm holder are secure.
SIM Single-tank screw connections
• Verify that the four screws on the single tank are secure.
¹ Completely remove any loose screw connections and screw them in again using
LOCTITE 242.

Fig. 13: Holder and single tank attachment

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3.2.9 Power cable

NOTE Replacement of cable winch including cable:

MOBILETT XP Digital every 4 years

PMP Cable winch replacement

• If the replacement interval has been reached, replace the cable winch according to the
"Replacement of parts" instructions.
SIM Checking the power cable
• Pull the entire power cable (6m) out of the cable winch. Check the cable for damage.
SIM General cable winch information
• Pull the entire power cable (6 m) out of the cable winch. Hold the cable while coiling and
move it up and down until the cable is fully coiled. Verify that the cable winch and the
brake work properly.
PMP Cleaning
• Clean the power cable with a cloth. Dampen the cloth with a mixture of lukewarm water
and household cleaner.

3.2.9.1 Power plug

SIM Checking the power plug
• Check the power plug for proper functioning.
• Open the plug and check the terminals and strain relief.
¹ The ground wire has to be slightly longer than the other wires (applies to all plug
types).

Fig. 14: Ground wire

3.2.10 Lubrication
PMP Pull-bar slide bushing

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48 Inspection and maintenance

Lubricate the pull bar of the side bushing (Fig. 15 / p. 48).

Fig. 15: Lubrication point

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3.3 Function inspection

3.3.1 Operating data

Activating service programs
• Switch off the system, unplug the power plug, remove the top cover and place it side-
ways on a table or the like. Do not disconnect any cables.
• Move service switch SW2B into position 2 (service) board D916 (CPU) (Fig. 16 / p. 49).
• - Switch the system on.
¹ "Pr 1" is displayed on the control panel.
• Use the mAs+/mAs- buttons to select the desired service program.

NOTE The X-ray function is deactivated during an active service pro-

gram.
For detailed information, see Troubleshooting Instructions
SPR8-230.840...

Fig. 16: CPU D916

3.3.1.1 Reading out the operating information

PMF Exposure counter
• Select ServiceProgram 02 and record the "exposure" counter status in the protocol.
PMF Error memory
• Select ServiceProgram 03 and read out the error memory. If a defective component
message is displayed, check it according to the troubleshooting instructions. Reset the
memory in service program 04.
• Switch off the system.
• Return service switch SW2B D916 (CPU) to position 1 (user).

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50 Inspection and maintenance

3.3.2 Displaying the control panel

PMF Mains display
• The yellow line voltage control LED must be lit when the line voltage plug is plugged in
(3/Fig. 17 / p. 50).
• System ON.
PMF kV/mAs default values
SIE kV/mAs segment displays
• The kV/mAs default values must display and be completely legible (take the default val-
ues from the start-up protocol).
PMF Ready indicator
• The green ready LED (2/Fig. 17 / p. 50) should light up within 15 seconds of "system
ON".
SIE kV/mAs displays according to operating instructions
• Select all kV/mAs values.

3.3.3 Checking the radiation indicator

Fig. 17: Control and display

SIE Radiation indicator
SIE Ready indicator
SIE Acoustic signal
• System is switched on.
• Set 81 kV and 10 mAs.
X • Initiate an exposure.
The radiation indicator (1/Fig. 17 / p. 50) lights up during the exposure; at the same
time an acoustic signal sounds and the "ready" light goes out.

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• The "ready" light (2/Fig. 17 / p. 50)goes on again within a maximum of 15 seconds.

3.3.4 Manual termination of exposure

The user must be able to cancel an exposure at any time.
SIE “ERR 39” display
SIE Acoustic signals
• System is switched on.
• Set a midrange kV value (e.g., 70 kV) and the highest possible mAs value.
X • Release an exposure and interrupt it immediately.
¹ The display then reads "ERR 39" and several short acoustic signals are emitted
("ERR 39 = exposure aborted). Acknowledge the error message with the "colli-
mator light" key on the control panel.

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3.4 Collimator

3.4.1 Lamp replacement

PMP Annual replacement of the collimator lamp

The collimator lamp should be replaced every 12 months.
U Tools and auxiliary materials required
- Rope for securing the support arm (approx. 4m long)
- Allen wrench set
- Screw driver set 1-6 (Phillips head and slotted head screws)
24V/100W lamp - Siemens order no.: 08392016

NOTE Do not touch the lamp with bare hands. Touch the bulb only with a
clean, dry cloth.

Required work steps:

• Switch off the system and possibly disconnect the power plug.
• Use a rope or tightening belt to secure the system support arm against lifting
(B/Fig. 18 / p. 53).
¹ The single tank should rest securely on a table or the like.
• Remove the two adjustment knobs of the collimator (2 mm Allen wrench)
(C/Fig. 19 / p. 53).
¹ Note the position of the knobs during removal.
• Disconnect the plug of the DAP measurement chamber (if present).
• Open the collimator cover (1/Fig. 20 / p. 54).
¹ Turn the cover and remove the connections: DAP plug; light switch, ground wire
(Fig. 21 / p. 54).
• Remove the protective cover from the lamp (4/Fig. 22 / p. 54).
• Replace the lamp (6/Fig. 23 / p. 55).
¹ The light filament of the lamp must be positioned directly over the rectangular
light aperture.
• To reassemble, repeat the above steps in reverse order.

PMF Light localizer function

• Turn the system ON and test the function of the light for all 3 light localizer buttons.

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Fig. 18: Single-tank service position

Fig. 19: Collimator rotary knobs

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Fig. 20: Collimator cover

Fig. 21: Terminals in the cover

Fig. 22: Lamp socket

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Fig. 23: Collimator lamp

3.4.2 Checking the illuminance

Required measuring instrument:

- Lux meter

PMF Illuminance
• Log the illuminance.
If the light localizer is switched on for illuminating the radiation field, the average illumi-
nance must be at least 180 Lux at a distance of 100 cm. The average illuminance is deter-
mined in that measurements are performed approximately in the center of each of the four
light field quadrants (Fig. 24 / p. 55).

Fig. 24: Illuminance

3.4.3 Light field/radiation field

Checking the light and radiation field
• Place the detector (35 cm x 43 cm) on the tabletop.

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• Set the central beam so that it is vertical.

• Set a vertical SID of 100 cm.
¹ Use the tape measure in the collimator to measure to the top surface of the
detector.
• Switch on the light localizer and adjust a light field of approx. 30x30 cm on the detector.
• Place the lead ruler (centering cross) centered on the detector.
• Measure the light field and make a note of the dimensions (Fig. 25 / p. 56).
• Position a washer as a side marker.

Fig. 25: Centering cross

• Create a test patient.
• Select an organ program from the "TEST" area with approx. 60 kV, 4mAs.
¹ "Exposure ready" appears in the top right corner on the monitor.
X • Initiate exposure.

Evaluation: Light field to radiation field

QSQ Deviation ((A + C) / SID)
QSQ Deviation ((B + D) / SID)
• Evaluate the deviations (A, C and B, D) between the recorded light field and the radia-
tion field edges on all four sides using the centering cross (Fig. 26 / p. 57). Use the
zoom function as necessary.
¹ The total permissible deviation (disregarding the prefix) amounts to a maximum
of 1.7% of the SID. If the deviation is > 1.7%, the collimator must be adjusted
(see the "Replacement of Parts" instructions).
Log the deviation.

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Fig. 26: Light field/radiation film

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3.5 Battery and motor drive inspection

3.5.1 Batteries

NOTE The life of battery packs BK1-BK4 is estimated at 12-24 months.

There is no acceptable measuring procedure to determine the bat-
tery quality.
Battery life is dependent on the charging and discharging times
which are largely determined by the user.
The user must provide the charge/discharge time ratio.

The longest charging time is approx. 12 hrs. The three LEDs light up yellow on the control
panel (3/Fig. 27 / p. 58).
One discharge cycle allows for 80 exposures with maximum kV/mAs values and transport
operation of approx. 3,000 m.
Realistic statement: The MOBILETT does not need to be charged during the 12-hour
workday.
If the minimum battery charge is reached in < 5 hrs., the battery must be replaced.

Fig. 27: Battery status display

PMF Charging performance
• Ask operating personnel about the charging cycles.
¹ If necessary, replace the batteries as described in the "Replacement of parts"
instructions.

3.5.2 Motor drive

NOTE Completely reassemble the system and attach all the covers for
the following work procedures.

PMF Forward/backward
PMF Slow/fast
• Turn the system ON and release the hand brake.
• Check the transport movements according to the operating instructions.

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3.6 Options

3.6.1 DAP measuring system

Measuring device for dose area product (Dose Area Product).
The DAP measuring device is used to measure the kerma area product (kerma = kinetic
energy released in matter) during an X-ray examination. It is primarily used to record the
radiation dose a patient has been exposed to.
The DAP is calibrated at the factory.
SIE Function of the DAP measuring system
• System is switched on.
• Press the Test button on the DAP display.
¹ The subsequently displayed value must be between 80-120 µGym2 (DAP reso-
lution range 0.1 µGym) or 8-12µGym (DAP resolution range 0.01µGym) for a
high-resolution chamber.
¹ If the display is incorrect, the measuring device must be calibrated. See the
"Replacement of parts" instructions (SPR8-230.841...).
X • Verify the function of the DAP measuring system by releasing an exposure.
¹ A measured value is displayed in the DAP display as a function of the object in
the beam path.

3.6.2 Remote control

PMP Battery replacement for remote control (yearly)
• Replace the battery (9V alkaline).
SIE Remote control function
• Check the function of the remote control.
• Switch on the light localizer of the collimator.
X • Initiate an exposure.

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3.7 Checking the kV/mAs exposure parameters

3.7.1 kV accuracy

Requirement:
The measured kV values must be within the limit values, see tables.
One of two measuring methods can be used:
1.) kV meter procedure:

- kV meter based on the filter comparison method (e.g. PTW Nomex)

Use the correction factor given in the kV meter operating instructions for
non-invasive kV measurements.

2.) Oscilloscope method:

- Storage oscilloscope with a measuring accuracy of ± 2.5%

kV meter method:

NOTE The inherent filtration (AL equivalent) of MOBILETT XP Digital is

3.1mmAl (single tank plus collimator).
An installed DAP measurement chamber increases the inherent fil-
tration by 0.4 mm AL.

• System is switched on.

• Select the analog operating mode.
• Prepare the kV meter for the measurement according to the operating instructions.
• Place the measuring detector on a suitable surface and center the single tank with re-
spect to the measuring detector (Fig. 28 / p. 61).
• Set the source-image distance to the value specified in the kV meter operating instruc-
tions.
• Use the light localizer to collimate to the measuring detector.

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Fig. 28: kV measurement

X • Set the following exposure parameters and initiate an exposure after each setting:

kV meter Exposure parameters

Limit values
Select
52 kV 50 mAs 49.0 - 55.0 kV
DC voltage 81 kV 20 mAs 77.0 - 85.0 kV
133 kV 12.5 mAs 126.4 - 139.6 kV

PMF kV accuracy 52 kV, 50 mAs

PMF kV accuracy 81 kV, 20 mAs
PMF kV accuracy 133 kV, 12.5 mAs
Record the measured values.

Oscilloscope method:
"KVS" measuring point for the nominal value and “KV” measuring point for the actual
value. The measuring ratio is 30 kV/V.
• Open the top system cover and place the cover sideways on a table or the like. Do not
disconnect any cables.

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• Connect the oscilloscope to the measuring points of the (CPU) D916 TP ”KV” and
“KVS” (also see the troubleshooting instructions). Oscilloscope setting: Channel 1 = TP
KV 1V/div, channel 2 TP KVC 2V/div, trigger channel 2, trigger stage 2.5 V, 2V/div, 50
ms/div (oscilloscope setting: Channel 1 = TP KV 1V/div, channel 2 TP KVC 2V/div, trig-
ger channel 2, trigger stage 2.5 V, 2V/div, 50 ms/div)
¹ Oscilloscope setting: Channel 1 = TP "KV" 1V/div, channel 2 TP "KVS" 2V/div,
trigger channel 2, trigger stage 2.5 V, 50 ms/div
• Follow the same procedure as described in “kV meter method”.

3.7.2 mAs accuracy

Requirement:
The measured mAs values must be within the limit values, see tables.
One of two measuring methods can be used:
1.) mAs meter method:

- mAs meter (e.g., MAS meter 8160400 with a measuring accuracy of 1 % ± 1

decimal place)

2.) Oscilloscope method:

- Storage oscilloscope with a measuring accuracy of ± 2.5%

Oscilloscope method:
• Open the top cover of the MOBILETT XP Digital and place it sideways on a table or the
like. Do not disconnect any cables.
• Connect the oscilloscope to the "JR" and "GND" measuring points on CPU D916.
• Switch on the MOBILETT XP Digital.
• Select the analog operating mode.
¹ After switching the unit on, wait approx. 5 minutes for it to stabilize.
X • Release exposures according to the table.

Parameter setting Allowable mAs value

kV mAs
40 5 4.7 - 5.3
81 2 1.9 - 2.1
133 10 9.5 - 10.5

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The mAs value can be calculated with the help of the oscilloscope display.

Calculating the mAs value (example):

Fig. 29: mAs calculation

Surface "A" corresponds to the mAs value.

mAs = Tube current x Exposure time

mAs = 340 mA x 0.006 s = 2.0 mAs

PMF kV accuracy 40 kV, 5 mAs

PMF kV accuracy 81 kV, 2 mAs
PMF kV accuracy 133 kV, 10 mAs
• Calculate and record the mAs values.

mAs meter method:

Use of the mAs jumper on PCB D907 directly on the single tank.
• Remove the cover from single tank and connect the mAs meter to D907
(1/Fig. 30 / p. 64).
• Follow the same procedure as described in the “Oscilloscope method” section.
For more information on the measuring technique, refer to the user manual for the mAs
meter.

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Fig. 30: mAs jumper D907

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3.8 Reproducibility test (USA only)

Requirement:
The coefficient of variation for the radiation dose for any combination of exposure param-
eters does not exceed 0.045. This requires operation at the line voltage compliant with
Siemens specifications.

NOTE In the following test, 10 sequential exposures are taken within one
hour.
The exposure parameters should be briefly set to different values
following each measurement.

Required measuring instrument:

- Dosimeter

Procedure:
• After switching the system on, wait until its temperature has stabilized. The unit is ready
for these measurements after 15 minutes.
X • Initiate the number of exposures with the specified exposure data:
- 85 kV, 1.0 mAs, 10 exposures.
• Measure the dose for each exposure.
• Reset the display prior to each new measurement.

Calculations:Coefficient of variation C
Coefficient of variation C is determined for a series of 10 dose measurements with the fol-
lowing formula:

Fig. 31:

s = Standard deviation resulting from the measurements

_
x = Average measurement of the series
xi = i. measurement of series
n = Number of individual measurements in series

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The following shows an example of the procedure. Follow this procedure and record the
result in the protocol.
Coefficient of variation C must be ≤ 0.045.
If the value obtained is > 0.045, locate and correct the cause according to the trouble-
shooting instructions.
QSQ Determine coefficient of variation C.
Example for determining coefficient of variation C:
Step 1)
• 10 exposures with recorded measurements (fictitious measured values).

Exposure Measured val-

(n=10) ues
(xi)
1 1.01
2 1.02
3 1.03
4 1.04
5 1.03
6 1.02
7 1.02
8 1.01
9 1.03
10 1.04

Step 2)
• Addition of measured values:
∑ = 1.01 + 1.02 + 1.03 + 1.04 + 1.03 + 1.02 + 1.02 + 1.01 + 1.03 + 1.04 = 10.25

Fig. 32:
Step 3)
Calculation of the standard deviation:

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Fig. 33:

Fig. 34:

Fig. 35:
Step 4)
• Calculation of the coefficient:

Fig. 36:
In this example, the generator complies with the specification:
C = 0.0105, hence it is ≤ 0.0450.

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3.9 Checking the image quality

In the course of maintenance, the image quality must be checked and documented in
accordance with the document "Quality assurance, SPR8-230.820.30...”. File the com-
pleted quality assurance report in the "Certificates" register no. 9 in the system binder.

3.9.1 Dose measurement

QIQ Dose measurement
• See “Quality assurance, SPR8-230.820.30...”.

3.9.2 Resolution
QIQ Resolution
• See “Quality assurance, SPR8-230.820.30...”.

3.9.3 Contrast
QIQ Contrast
• See “Quality assurance, SPR8-230.820.30...”.

3.9.4 Hardcopy
Only necessary when a hardcopy camera is configured.
QIQ Hardcopy
• See “Quality assurance, SPR8-230.820.30...”.

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3.10 Protective conductor test

SIE Protective conductor test
Observe the protective conductor resistance test information in these instructions.
• Perform the protective conductor test with all covers closed, according to
ARTD-002.731.17....
The protective conductor resistance must not exceed 0.2 Ohms.
• The values determined, including the measuring points, must be recorded and as-
sessed in the protective conductor resistance report.
• The measuring procedure and the measuring device used (designation and serial num-
ber) must also be documented.

NOTE File the protective conductor resistance report in the "Certificates"

register no. 9 in the system binder.

NOTE A new report must be created if the protective conductor resis-

tance measurements are not documented.
A new protective conductor resistance report can be found in the
startup instructions SPR8-230.814.30.03. Separate this report from
these instructions, fill it out, and file it in the "Certificates" register
no. 9 in the system binder. If values are newly determined, they
must be recorded as first measured values. The evaluation is omit-
ted in this case.

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3.11 Leakage current measurement

SIE Leakage current measurement
Observe the leakage current measurement information in these instructions.
• Perform the leakage current measurement with all covers closed, according to
ARTD-002.731.17....
The measuring procedure indicated in the report must be used. If the first measured
value has to be newly determined, a measuring procedure can be selected (direct
measurement or differential measurement).
The limit value of 2.5 mA may not be exceeded.

WARNING Electrical voltage!

Non-compliance can lead to severe injury and even death.
¹ No housing parts of the system may be touched during
direct measurement of the leakage current .
¹ Third-person access to the system must be prevented.

• The system must be switched on during measurement. Measuring devices with auto-
mated measuring sequences must therefore be set to manual measurement.
• Document the measuring procedure (differential measurement or direct measurement)
and the measuring device used (designation and serial number).
• Measure and record the current line voltage. If the measured line voltage deviates from
the nominal voltage, correct the measured value to the value corresponding to a mea-
surement at the nominal value of the line voltage. This must also be documented.
• The highest value must be entered in the leakage current report and evaluated.

NOTE File the leakage current report in the "Certificates" register no. 9 in
the system binder.

NOTE A new report must be created if the leakage current measurements

are not documented.
A new leakage current report can be found in the startup instruc-
tions SPR8-230.814.30.03. Separate this report from these instruc-
tions, fill it out, and file it in Register 9, "Certificates", in the system
binder. If values are newly determined, they are to be recorded as
first measured values. The evaluation is omitted in this case.

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3.12 Patient leakage current measurement

SIE Patient leakage current measurement
Observe the patient leakage current measurement information in these instructions.
• Perform the patient leakage current measurement with all covers closed, according to
ARTD-002.731.17....
• Measure the patient leakage current at the flat detector.
• The limit values of 0.01 mA for direct current and 0.1 mA for alternating current may not
be exceeded.
• The system must be switched on during measurement. Measuring devices with auto-
mated measuring sequences must therefore be set to manual measurement.
• Document the measuring procedure and the measuring device used (designation and
serial number).
• The value determined must be entered in the patient leakage current report and evalu-
ated.

NOTE File the patient leakage current report in the "Certificates" register
no. 9 in the system binder.

NOTE A new report must be created if the patient leakage current mea-
surements are not documented.
A new patient leakage current report can be found in the startup in-
structions SPR8-230.814.30.03. Separate this report from these in-
structions, fill it out, and file it in the "Certificates" register no. 9 in
the system binder. If values are newly determined, they must be re-
corded as first measured values. The evaluation is omitted in this
case.

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3.13 Cleaning
PMP Cleaning
• Dampen a cloth with a mixture of lukewarm water and regular household cleaner. Clean
the entire system.

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4-
4 Changes to previous version
Section Paragraph Revision
General maintenance infor- Information on the protec- New paragraph added
mation tive conductor resistance
test
General maintenance infor- Information on measuring New paragraph added
mation the leakage current
General maintenance infor- Information on measuring New paragraph added
mation the patient leakage current
Inspection and maintenance Protective conductor test Completely rewritten
Inspection and maintenance Leakage current measure- Completely rewritten
ment
Inspection and maintenance Patient leakage current New paragraph added
measurement

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