Preventive Maintenance

MAINTENANCE INSTR.
Copyright

© Ericsson AB 2006 – All Rights Reserved

Disclaimer

No part of this document may be reproduced in any form without the written
permission of the copyright owner.

The contents of this document are subject to revision without notice due to
continued progress in methodology, design and manufacturing. Ericsson shall
have no liability for any error or damage of any kind resulting from the use
of this document.

18/1541-LZA 701 0001 Uen A 2006-11-08

 Preventive Maintenance

Contents

1 Introduction 1

2 Determining Preventive Maintenance Intervals 1

3 Maintaining Antenna Systems 2

3.1 Checking Antenna Systems 2

4 Maintaining Batteries 4
4.1 Checking the batteries 4

5 Replacing Fans 5

6 Cleaning the HEX 5

18/1541-LZA 701 0001 Uen A 2006-11-08

Preventive Maintenance

18/1541-LZA 701 0001 Uen A 2006-11-08

 Preventive Maintenance

1 Introduction

This document describes how to perform preventive maintenance. The process

causes a minimum of interruption to the operation of the RBS.

During normal use, parts of the RBS become dirty or worn. To prevent a fault in
the RBS, regularly scheduled cleaning or replacement of parts is necessary.

Preventive Maintenance Process

Determining Preventive
Maintenance Intervals

Maintaining
Antenna Systems

Maintaining Batteries

Replacing Fans

Cleaning the HEX

P015858B

Figure 1 Preventive Maintenance Process

2 Determining Preventive Maintenance

Intervals

The table below shows how to determine which routines to perform. The
routines are always performed in the order they appear in the table.

Note: The interval between inspections at each RBS site can vary depending
on the environmental conditions found there.

18/1541-LZA 701 0001 Uen A 2006-11-08 1

Preventive Maintenance

Table 1 Preventive Maintenance Intervals

Action Interval
Antenna system maintenance Once a year
(1)
Battery maintenance Every 5 years
(1) (2)
Replace batteries Every 5 years
Replace fans Every 10 years
(3)
Cleaning heater exchanger Once a year
Checklist ‘‘Before Leaving the Site’’ Every site visit
(1) It is recommended that batteries are purchased locally. Refer to information supplied by the
manufacturer for the correct inspection and replacement intervals.
(2) This procedure is included in Section 4 on page 3.
(3) The interval for cleaning the Heater Exchanger (HEX) can very depending on the
environmental conditions.

3 Maintaining Antenna Systems

This section contains a checklist for the antenna system and actions to take if
faults are found.

No performance check for the antenna system is recommended for first-line

maintenance.

Warning!

Risk for falling objects, work at height in progress. Falling objects can cause
serious injury or even be fatal. Always wear a helmet and avoid standing in
the danger area.

Note: Local safety regulations sometimes require all maintenance on antenna

or antenna towers to be performed by individuals who are certified to
climb antenna poles and masts.

3.1 Checking Antenna Systems

The following checklist is not mandatory but is strongly recommended. Local
procedures and safety regulations must be evaluated and included in this

2 18/1541-LZA 701 0001 Uen A 2006-11-08

 Preventive Maintenance

checklist. If any of the statements in the checklist cannot be complied with,

instructions to rectify the situation follow the checklist.

Table 2 Antenna Checklist

Ensure that: Yes
1 The poles are in a safe condition, that is, free of cracks, bends or
loose connections
2 The lightning protection system is secure and functional
3 All TMAs are firmly mounted and in good condition
4 All cables have labels
5 Cables are secured to poles (about once every 0.6 m)
6 The cable seals at the entry point into the cabinet are in good condition
7 All cables are free from abrasions, cuts, and cracks
8 All cable connector seals are in good condition
9 All cable ducts are dry and the seals in good condition
10 Antenna towers and legs are not corroded
11 Antenna towers are not bent or bowed
12 Aircraft warning lights are operational
13 Support foundations show no signs of wear or cracks
14 Guy wires are not excessively corroded
15 Guy wires show no signs of loosening
16 Guy wires have no broken strands
17 Antennas are correctly oriented
18 Antennas are firmly mounted
19 The RBS transmission path is free of obstructions (no new buildings,
towers, and so on blocking it since installation)
Signature:
Date:

Actions

1. Tighten loose connections.

2. Replace defective Radio Frequency (RF) cables in the cabinet.

3. Contact the supervisor to inform them of any other faults found when filling
in the checklist, as further repair activities may require field technicians who
are trained and certified to climb towers.

18/1541-LZA 701 0001 Uen A 2006-11-08 3

Preventive Maintenance

4 Maintaining Batteries

There is no specific performance check for the battery system for first line
maintenance.

Note: Read the Safety instructions regarding handling and connecting

batteries in the documents Personal Health and Safety Information
and System Safety Information.

Note: It is recommended that batteries are purchased locally. Refer to

information supplied by the manufacturer for the correct inspection
and replacement interval.

Caution!

Improper handling of batteries can result in the batteries short-circuiting, which

can result in serious injury due to high energy levels. Exercise the necessary
care when working with batteries.

4.1 Checking the batteries

The checklist and instructions for battery preventive maintenance in this section
are general. For specific instructions and actions to correct faults in batteries,
see the manufacturer’s documentation.

The following checklist is not mandatory but is strongly recommended. Local

procedures and safety regulations must be evaluated and included in this
checklist. If any of the statements in the checklist cannot be complied with,
instructions to rectify the situation follow the checklist.

Table 3 Battery Checklist

Ensure that: Yes
1 The batteries and battery box are not dirty, excessive greasy,
oxidized, or corroded
2 All cables are firmly connected and in good condition
3 The battery casings are not discolored or deformed
4 The battery terminals are not bent or excessively cut
5 The batteries are still within their replacement date
6 No batteries are leaking (acid)

4 18/1541-LZA 701 0001 Uen A 2006-11-08

 Preventive Maintenance

Ensure that: Yes

Signature:
Date:

Actions

1. See the manufacturer’s documentation.

2. Contact the supervisor to inform them of any other faults found when filling
in the checklist, as repair activities will require replacement of the batteries.

5 Replacing Fans

Note: The only preventive maintenance included in this procedure is

replacement.

1. When replacement is necessary for preventive maintenance, replace all

three fans. See document Replacing Fans and Climate Units.

6 Cleaning the HEX

This section describes how to clean the Heater Exchanger (HEX).

To clean the HEX, do the following:

1. Remove the HEX according to the instructions in Replacing Fans and

Climate Units.

18/1541-LZA 701 0001 Uen A 2006-11-08 5

Preventive Maintenance

2. Clean the HEX on both sides as

follows:
• Use a spray bottle or soft brush
with degreasing agent
• Use compressed air to blow out
any dirt
• Spray with soap solution to
remove any grease
• Use the compressed air to dry
the HEX.

P016752A

3. Put back the HEX according the instructions in document Replacing Fans
and Climate Units.

6 18/1541-LZA 701 0001 Uen A 2006-11-08