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0% found this document useful (0 votes)
193 views122 pagesFT 890
Radioaficionado.
Uploaded by
Richard Manuel Movil CujiaCopyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF or read online on Scribd
/ 122
FT-890
Technical Supplement
VERTEX STANDARD CO., LTD.
4-8-8 Nakamoguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A
International Division
8350 N.W. 52nd Terrace, Suite 201, Miami, FL.33166, U.S.A.
YAESU EUROPE B.V.
P.O, Box 75525, 1118 ZN Schiphol, The Netherlands
YAESU UK LTD.
Unit 12, Sun Valiey Business Park, Winnall Close
Winchester, Hampshire, S023 OLB, UK.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hol Bun Road,
Kwun Tong, Kowloon, Hong Kong Contents
Introduction & Chip Component Replacement ...........- eed
Circuit Board Access, Battery & Lamp Replacement, CPU Resetting. .... . . 2
Alignment... . ocd tenet n tence nen ene 3
Block & Interconnection Diagrams ..... 0... 00 e cece e eens 4
PCB Diagrams & Parts Lists ..... Smee erence renee enee eS
Local Unit... ee ee eee eee 5A
RF Unit ...
Display Unit 5
100-W Power Amp (Pa) Unit.
Keyer Unit
Tuner Main Unit . . .
Tuner Control Unit
Carrier (CAR) DDS Unit .. . .
PLL Sub-Loop (SUB) DDS Unit
Notch Unit :
Potentiometer (VR) A, B & Clarifier (CLAR) Units
Headphone (HP), Microphone (MIC) & Potentiometer (VR) C Units .
Potentiometer (VR) D & Keyer Control Units . .
Switch A Unit
Switch B Unit
Switch C Unit
Mechanical Details (Exploded View & Mechanical Parts) . Introduction
This manual provides technical information
necessary for servicing the Yaesu FT-890 HF
Transceiver. It does not include information
on specifications, installation and operation,
which are described in the FT-890 Operating
Manual, provided with each transceiver, or on
FT-890 accessories, which are described in
manuals provided with each.
Servicing this equipment requires expertise
in handling surface mount chip components.
Attempts by non-qualified persons to service
this equipment may result in permanent dam-
age not covered by warranty.
For the major circuit boards, each side of the
board is identified by the type of the majority of,
components installed on that side. In most cases
one side has only chip components, and the
other has either a mixture of both chip and
lead components (trimmers, coils, electrolytic
capacitors, packaged ICs, etc.), or lead compo-
nents only:
While we believe the technical information
in this manual is correct, Yaesu assumes no
liability for damage that may occur as a result
of typographical or other errors that may be
present. Your cooperation in pointing out any
inconsistencies in the technical information
‘would be appreciated.
Yaesu Musen reserves the right to make
changes in this transceiver and the alignment
procedures, in the interest of technological im-
provement, without notification of the own-
ers.
FT-890 Technical Supplement
11 Circuit Board Access
© Turn the transceiver off and disconnect all
cables.
Gi Place the set upside-down on the work sur-
face, with the rear facing you, and remove
the 8 screws affixing the bottom cover (pho-
tos 1 & 2). This exposes the component side
of the RF Unit.
To remove the top cover, disconnect the
light-blue-banded coaxial cable from J2026
near the rear of the exposed RF Unit (photo
3).
Photo 1
Note: the cable must be reconnected to
J2026 during alignment (except for Local
Unit and PA Unit procedures).
Gi Place the transceiver topside-up so the rear
panel is facing you, and remove the 4
screws indicated in photo 4.
© Remove the 4 screws in the shield panel at
the left, as shown in photo 5, to access the
Local Unit.
1 Remove the 11 screws in the shield panel at
the right to access the PA, LPF and Keyer
Units.
Photo 3
FT-890 Technical Supplement
24 Circuit Board Access, Lamp & Battery Replacement
Tuner Control Unit,
Tuner Main Unit Local Unit
Tuner Control Unit
&
‘Tuner Main Unit
LPF Unit
100W PA Unit
Battery & Pilot Lamp Replacement
G1 Disconnect all cables and remove the top
and bottom covers.
C Remove the 4 screws from both sides of the
front panel, as indicated below (for pilot
lamp replacement, the bottom two screws
can be just loosened).
© Gently pull the front panel away from the
chassis (or just fold it down for pilot lamp
replacement).
reno
ooeen
22
G Pilot lamp location is indicated below. To
change the backup cell, use your fingers to
remove the old cell from its holder (do not
grab it with metal tweezers or pliers, as that
could short it out). Replace only with Sony
lithium type CR2032 (Yaesu part number
Q900564), or equivalent.
FT-890 Technical Supplement CPU Resetting
a
Resetting the Microprocessors
Functional problems involving frequency,
mode and memory selection can sometimes be
resolved simply by resetting the microproces-
sors. There are two ways to reset the micro-
processors in the FT-890, both of which clear
the contents of all memories, leaving them at
the factory defaults.
Soft Reset
This procedure relies on a ROM routine
which should normally suffice to correct most
operating misfunctions. Turn the transceiver
off, then hold both the HAM/GEN button and the
CLAR button while switching the transceiver
back on. If the problem persists, proceed to the
Hard Reset.
Hard Reset
© Tum the transceiver off, and then turn the
Backup switch (inside the hole near the
front center of the bottom cover) off.
Gi Let the transceiver sit for several minutes.
CO Turn the transceiver on, then turn the
Backup switch back on (after the transceiver
has been turned on).
corr Gam on
FT-890 Technical Supplement
23 Alignment
‘The FT-890 is carefully designed to allow
the knowledgeable operator to make nearly all
adjustments required for various station con-
ditions, modes and operator preferences sim-
ply from the controls on the panels, without
opening the case of the transceiver. The FT-890
Operating Manual describes these adjustments,
plus certain internal settings.
The following procedures cover the some-
times critical and tedious adjustments that are
not normally required once the transceiver has
left the factory. However, if damage occurs
and some parts subsequently be replaced, re-
alignment may be required. If a sudden prob-
lem occurs during normal operation, it is
likely due to component failure; realignment
should not be done until after the faulty com-
ponent has been replaced.
We recommend that servicing be performed
only by authorized Yaesu service technicians,
experienced with the circuitry and fully equip-
ped for repair and alignment. So if a fault is
suspected, you should contact the selling
dealer for instructions regarding repair. Auth-
orized Yaesu service technicians have the lat-
est modification information, and realign all
circuits and make complete performance
checks to ensure compliance with factory spe-
cifications after replacing faulty components.
Those who do undertake any of the follow-
ing alignments are cautioned to proceed at
their own risk. Problems caused by unauthor-
ized attempts at realignment are not covered
by the warranty policy. Also, Yaesu must re-
serve the right to change circuits and align-
ment procedures in the interest of improved.
performance, without notifying owners.
Under no circumstances should any align-
ment be attempted unless the normal function
and operation of the transceiver are clearly
understood, the cause of the malfunction has
been clearly pinpointed and any faulty com-
ponents replaced, and the need for realign-
ment determined to be absolutely necessary.
The following test equipment (and thor-
ough familiarity with its correct use) is neces-
sary for complete realignment. Correction of
problems caused by misalignment resulting
341
from use of improper test equipment is not
covered under the warranty policy. While
most steps do not require all of the equipment
listed, the interactions of some adjustments
may require that more complex adjustments
be performed afterwards. Do not attempt to
perform only a single step unless it is clearly
isolated electrically from all other steps
Rather, have all test equipment ready before
beginning, and follow all of the steps in a
section in the order they are presented.
G Digital DC Voltmeter (high-Z, >1 MQ/V)
O DCAmmeter
OD RF Millivoltmeter
O AF Millivoltmeter
C7 RF Standard Signal Generator w/calibrated
output and dB scale, 0 dBy = 0.5 wV
© AF Signal Generator with calibrated output
Gi Spectrum Analyzer or receiver (30 MHz)
GF Oscilloscope
Gi Frequency Counter
50-2 Dummy Load (150 ~ 250 watts)
© 166-2 Dummy Load (>150 W)
© In-Line Wattmeter (150 ~ 250 W, 50-Q)
© Linear Detector
© RF Attenuator (>150-W, 40-dB) or coupler
Alignment Preparation & Precautions
A50-Q dummy load and inline wattmeter
must be connected to the antenna jack in all
procedures that call for transmission, except
where specified otherwise. Correct alignment
is not possible with an antenna.
Except where specified otherwise, the tran-
sceiver should be tuned to 14.2 MHz, USB
mode, and these controls set as indicated:
©) MOx & VOX buttons OFF (m™)
© AGC-F button ON (m)
PROG, IPO, ATT & RPT/T buttons OFF (mm)
O MIC & RF PWR fully cew (minimum)
C7 Aras required, RF fully cw (maximum)
NB 12-0’clock, SQL fully cew
NOTCH & SHIFT to 12-0’clock
FT-890 Technical Supplement Alignment
Sr
After completing one step, read the follow-
ing step to determine whether the same test
equipment will be required. If not, remove the
test equipment (except dummy load and watt-
meter, if connected) before proceeding.
Correct alignment requires that the ambient
temperature be the same as that of the trans-
ceiver and test equipment, and that this tem-
perature be held constant between 20 and 30
°C (68~ 86 °F). If the transceiver is brought
into the shop from hot or cold air it should be
allowed some time for thermal equalization
with the environment before alignment.
Alignments must only be made with oscil-
lator shields and circuit boards firmly affixed
in place. Only one extender board should be
installed ata time for access to the board being
aligned. Also, the test equipment must be thor-
oughly warmed up before beginning,
Note: Signal levels in dB referred to in align-
ment are based on 0 dBu=0.5 pV.
Table note: DC voltages should be within +
10% of those listed in the voltage tables.
Local Unit
Refer to the Local Unit Alignment Diagram on
page 3-10. To prevent PLL unlock from inter-
fering with the Local Unit alignment process,
connect TP1008 to ground. Remember to dis-
connect TP1008 when finished alignment.
Reference Oscillator
© Connect the frequency counter to TP1004.
C7 If the counter frequency differs by more
than 5 Hz from 10.485760 MHz, adjust the
TCXO-3 trimmer (if the TCXO is installed)
or TC1002.
© Replace the counter with the RF millivolt-
meter, and confirm at least 120 mVrms.
70-MHz 2nd Local Oscillator
(J Remove the coaxial plug from J1003 and
connect a 50-2 resistor in parallel with the
frequency counter across the socket.
CF Adjust 1.1002 for 70.0000 MHz + 20 Hz.
GC Replace the counter with the RF millivolt-
meter, and confirm at least 40 mVrms.
C1 Remove the meter and resistor, and replace
the plug in J1003.
Carrier DDS Check
© Tum the mic and RF PWR controls fully cow
(minimum), and connect the frequency
counter to TP1009.
O Select LSB mode, key the transmitter, and
confirm 453.500 kHz on the counter.
Gi Select USB mode, key the transmitter, and
confirm 456.500 KHiz on the counter.
Select CW mode, key the transmitter, and
confirm 455.800 kHz on the counter.
Gy Select AM mode, key the transmitter, and
confirm 455,000 kHz on the counter.
© Connect the RF millivoltmeter to TP1009
and at least 80 mVrms in USB mode.
Sub-Loop: DDS Check
‘Tune the transceiver display to 7.0451 MHz.
Connect the RF millivoltmeter to TP1010
and confirm at least 40 mVims.
Sub-Loop: DDS Check
O Tune the transceiver display to 7.04511
MHz. Connect the frequency counter to
‘TP1007 and adjust L1045, if necessary, for 60
to 60.1 MHz on the counter.
© Connect the RF millivoltmeter to TP1011
and adjust T1002 and T1003 alternately sev-
eral times for maximum RF voltage.
Connect the DC voltmeter to TP1001 and
adjust L1045 for 5.0 + 0.2 V.
Tune the transceiver up 10 Hz to 7.04512
‘MHz and confirm 3.0 + 0.2 V at TP1001.
CO Tune the transceiver to 7.1270 MHz, connect
the RF millivoltmeter to TP1012, and adjust
T1002 and T1003 alternately (again) several
times for maximum RF voltage (at least 10
mVrms).
Main PLL: Local BPF & VCV
© Tune the transceiver to 7.1400 MHz, and
connect the RF millivoltmeter to TP1002
(pin 13 of Q1042),
CO Adjust T1005 and T1006 alternately several
times for peak RF voltage (at least 100
mVrms). Leave the meter at TP1002.
FT-890 Technical Supplement
32 Alignment
Et
CJ Connect the DC voltmeter to TP1003. Tune
the display to each adjustment frequency in
the following table and adjust the corre-
sponding trimmer capacitor for 6.0 £0.2 V
on the DC voltmeter. Then retune to the
check frequency and confirm the corre-
sponding check voltage (+ 0.5 V). Repeat at
each listed frequency.
Adjustment | Adj. for6V Check
Freq.(VeOH) | @TP1008 | Freq, | volts |
'30,00000(vO4)_|To1005 | 21.60000 | 18
1.49999 (VCO3) | Tc1006 | 1450000 | 18
1449999 (voo2) | Tcr003_| 7.50000 | 18
7.49999 voor) | Ter001 | 0.10000 [17
G Tune the transceiver to 29.9800 MHz and
again adjust T1005 and 1006 alternately
several times for peak RF voltage (at least
100 mVms) at TP1002.
1st Local Output Level Check
CF Remove the plug from J1001 and connect a
50-0 resistor and RF voltmeter in its place.
Tune to 30.0000 MHz and confirm at least
400 mV ms on the meter. Replace the plug in
Jioo1.
vrsoo1
Final Idling Current
PA Unit (RF Power Amplifier)
Final Idling Current
Make sure the transceiver has been on forat
least several minutes. Connect the DC volt-
meter between TP4001 (+) and TP4002 (—)
on the PA Unit. Key the transmitter in an
SSB mode, and with no microphone input,
adjust VR4001 for 6.0 mV + 0.5 mV.
LPF Unit
CM Coupler Balance
With the50-Q dummy load connected to the
antenna jack, tune the transceiver to 14.2
‘MHz, and select the CW mode. Connect the
DC voltmeter between pins 3 (-) and 4 (+)
of J5006, key the transmitter and adjust
‘TC5001 for minimum on the voltmeter.
Tuner Unit
‘Tuning Capacitor/Motor (Mechanical Check,
Setting & Adjustment)
CJ Loosen all set screws in the shaft coupler,
and turn the coupler by hand to confirm it
moves freely (the motor and capacitor
should not move). If the coupler binds,
check the motor mounting position (it is
‘Te400
Connect +leed of
DC Voltmeter
P4002
‘Connect —lead of
DC Voltmeter
100-W Power Amp (PA) Unit Test & Alignment Points
33
FT-890 Technical Supplement Alignment
15002
Connect to RF Input (J6502)
‘on Tuner Control Unit
to Align Tuner Impedance
TCS001
(CM Coupler Balance
35006
Connect DC Voltmeter
to pind (—) and 4 (+)
(minimum)
LPF Unit Test & Alignment Points
vesoz rosso!
RF Input: Connect to J5002 on LPF Unit \VR6501 Tuner Impedance
{3 odlet Ton npodoee —
=
. iNE
‘ i
e 2 e
ou a OO
~ T ®
5 ty) ©,
B i t o
Pal)
at BOT G ©
7 OO
oe ee Ivce (J6501 Tuner Out:
"mp © ground for Jump to ground for per Out
lignment capacitor Alignment a Connect 50-Q load
Ci. 7 eee 7 56508 for Impedance & Phase
covey Vonmater bewoon 1. Beacon
(Sodje impuamee ond tote 8 L
to adjust phase (OVolts)
Tuner Control Unit Test & Alignment Points
FT-890 Technical Supplement Alignment
a
soldered in place) and the capacitor mount-
ing (screws).
© Tum the power switch off, and jump TP-
6501 to chassis ground.
G Turn the power switch on. The motor
should rotate, and then stop.
Gi Set the capacitor to its maximum capaci-
tance position (plates fully meshed) by
hand, and tighten all shaft coupler set
screws, using care not to disturb the capaci-
tor or motor positions.
(0 Tun the power off, and jumper TP6502 to
chassis ground (along with TP6501).
© Tum the power back on. The motor should
move 180°, and the capacitor should be then
at minimum capacitance (fully unmeshed).
© Remove the grounding jumpers from
‘TP6501 and TP6502.
Tuner Impedance & Phase Detection
Connect the 50- dummy load and watt-
meter to J6501 (the output of the Tuner Con-
trol Unit), and connect J6502 (RF IN) to
J5002 (LPF OUT). Tune the transceiver to
14.000 MHz, CW mode.
GF Connect the DC voltmeter between pins 1
(r") and 2 (“V") of J6508 (either polarity).
VR3004 Meter Full-Scale
vR3001
Jw3001
© Press the TUNER and MOX buttons, adjust
the RF PWR control for 50 watts output, and
then adjust TC6501, if necessary, for meter
indication within + 0.08 V of OV.
CF While still transmitting, move the DC volt-
meter to pins 3 (“C”) and 4 (“L") of J6508
(either polarity), and adjust VR6501, if nec-
essary, for meter indication within + 0.02 V
of 0V.
RF Unit Local Signals and Oscillators
O With the RF millivoltmeter, confirm at least
900 mVims at TP2001, and 400 mVims at
TP2002 (see page 3-11).
Notch Oscillator
Connect the frequency counter to TP2004
(pin 7 of Q2020), and with the NOTCH con-
trol at 12 o’clock, adjust L2062 for 8.67 MHz
450 Hz,
© Replace the counter with the RF voltmeter,
and adjust T2032 for maximum voltage (at
least 300 mVrms):
PO Meter Calibration
\VR3002. SWR Motor Calibration
\VR3003. ALC Mater Sensitivity
Jump for TX Carrier Point Alignment
Display Unit Test & Alignment Points
35
Ti
890 Technical Supplement Alignment
a
Receiver Circuits
IF Interstage Transformers (1)
(coarse alignment - only for new IF Unit)
© Connect the RF signal generator to J2024 on
the RF Unit, and inject 100 dBy at 14.200
MHz. Connect the AF millivoltmeter across
and 8-Q load to the EXT SP jack on the rear
panel.
© Preset VR2003 fully clockwise, and adjust
72005, T2009 ~ T2012 and T2014 ~ T2021 in
succession several times peak AF output.
SSB Detector Balance
Inject 40 dBy at 14.200 MHz to the antenna
jack and adjust VR1001 on the Local Unit for
peak AF output.
‘1st Mixer Balance
In LSB mode, tune to the internal hetero-
dyne at 164 KEz, and adjust VR2001 and
‘VR2002 alternately several times for a null
in AF output.
Meter Full Scale
Cl Tum the transceiver off, and hold the ALC,
PO and SWR buttons together while switch-
ing back on (to activate the meter test
mode). Then press the PO button: the dis-
play should show “50”.
OG Adjust VR3004 on the Display Unit so the
meter deflects to the $9440 dB marker on the
S-meter scale.
G1 Press the PO button again to return to nor-
mal operation.
S-Meter Threshold
0 After performing the above full-scale ad-
justment, preset VR2006 on the RF Unit to
the 12 o’clock position.
Turn the SQL control fully clockwise and
adjust VR2005 to the point just before the
S-meter begins to deflect. The return the
SQL control fully counterclockwise.
IF Interstage Transformers (11)
Connect the RF signal generator to the an-
tenna jack, and inject 80 dBy at 14.200 MHz.
© Adjust T2005, T2009 ~ T2012 and T2014 ~
T2021 in succession several times for peak
S-meter indication (adjust the injection level
as necessary to keep the meter around mid
scale).
JE Gain
GF Inject 7 dBp at 14.200 MHz to the antenna
jack, and tune for peak on the S-meter.
CF Adjust VR2003 on the RF Unit forS-1 deflec-
tion.
S-Meter Full-Scale
Gi Inject 100 dBp at 14.200 MHz to the antenna
jack, and tune for peak on the S-meter.
Adjust VR2006 on the RF Unit for $9+60 dB
on the S-meter.
Gi Reduce the injection level so the S-meter
deflects to $9, and confirm the injection is
between 32 and 42 dBy.
Notch Null
Ci Inject 40 dBy at 14.200 MHz from the RF
signal generator to the antenna jack. Select
USB mode, make sure the NOTGH is off, and
tune to 14.20150 MHz (so a 1500-Hz hetero-
dyne is heard),
O Press the NOTCH button and, with the
NOTCH control centered, adjust VR7201 on
the Notch Unit and L2062 on the RF Unit
alternately several times for minimum S-
meter deflection or AF output.
SSB Squelch Threshold
In the USB mode, with no signal at the an-
tenna jack, set the SQL control to the 10-
o'clock position, and adjust VR1002 on the
Local Unit so that the squelch just closes.
FM Squelch Threshold (must be done only
after SSB Squelch Threshold, above)
In the FM mode, with no signal at the an-
tena jack, set the SQL control between the
9- and. 10-o’clock positions, and adjust
‘VR2004 on the RF Unit so that the squelch
just closes.
FT-890 Technical Supplement
36 Alignment
ey
Transmitter
Connect the 50-0 dummy load to the an-
tena jack for all procedures.
ALC Meter Zero Set
Note: Meter Full Scale alignment on the pre-
vious page must be done before this proce-
dure, and Overcurrent ALC Zero Set (below)
and Overcurrent ALC Turndown (also below)
must be done after.
G Select the ALC meter function, and preset
VR1014 on the Local Unit fully counter-
clockwise.
G Select USB mode, key the transmitter, and
with no modulation, adjust VR1017 on the
Local Unit to the point where the ALC me-
ter just begins to deflect.
Overcurrent ALC Zero Set
Note: Overcurrent ALC Turndown (below) must
be done after this procedure.
Gi Preset VRIOM4 on the Local Unit to its center
position, and connect the DC voltmeter be-
tween the anode of D1043 (+) and chassis
ground.
In USB mode, key the transmitter, and with
no modulation, adjust VR1013 on the Local
Unit for 0 V on the meter.
‘Transmitter IF Interstage Transformers
O With the inline wattmeter and 50-0 dummy
load connected to the antenna jack, set the
RF PWR control fully cow (minimum), and
select the ALC meter function.
© Tune to 14.200 MHz in the CW mode, key
the transmitter and adjust T2023 and T2026
~ 72029, several times, for peak on the ALC
meter or on the wattmeter (around 100
watts),
2nd Tx Mixer Balance
O Connect the RF attenuator and spectrum
analyzer to the antenna jack, and set the RF
PWR control fully cew (minimum).
0 Key the transmitter and adjust VR2007 on
the RF Unit for minimum spurious 455 kHz
on either side of 14.2 MHz (13.745 and
14.655 MHz).
Tx Drive
G Connect the DC voltmeter to the cathode of
D1042 on the Local Unit, and set the RF PWR
control fully clockwise.
© Adjust VR1015 on the Local Unit for 3.5 V
on the meter.
Overcurrent ALC Turndown
The Forward ALC (Max RF Output) procedure
below must be done after this.
OF With the inline wattmeter and 50-0. dummy
load connected to the antenna jack, tune to
21.000 MHz, CW mode.
i Preset VR1012 on the Local Unit fully clock-
wise.
O Key the transmitter and adjust the RF PWR
control for 140 watts on the wattmeter, and
confirm at least 130 watts output on each
band.
Forward ALC (Max RF Output)
Perform the previous procedure, and with
the same setup, tune to 14.200 MHz. Key the
transmitter and adjust VR1012 on the Local
Unit for 110 watts on the wattmeter.
Ext, Antenna Tuner Tuning Power
With the transceiver tuned to 14.200 MHz,
CW mode, install a temporary jumper be-
tween TP1005 & TP1006 on the Local Unit.
O With the dummy load and wattmeter on the
antenna jack, set the RF PWR control fully
clockwise.
O Key the transmitter and adjust VR1010 on
the Local Unit for 12 watts on the watt-
meter. Then remove the jumper.
The Meter Full Scale adjustment must be
done before this procedure.
CO With the transceiver tuned to 14.2 MHz,
USB mode, inject 3-mV at 1 kHz from the
AF generator to the microphone jack (pin 8).
0 Key the transmitter, and adjust the MIC gain
so the meter, set to ALC, just begins to de-
flect.
37
FT-890 Technical Supplement Alignment
es
C1 Increase the injection level to 7.5 mV, and
adjust VR3003 on the Display Unit so that
the meter deflects to the top edge of the
ALC zone.
PO Meter Calibration
Gi With the wattmeter and dummy load con-
nected to the antenna jack, tune to 14.200
‘MHz, CW mode, and press the PO meter
selector button.
O Key the transmitter and adjust the RF PWR
control for 100 watts on the wattmeter. Then
adjust VR3001 on the Display Unit so the
PO meter also indicates 100 watts.
Drive
© Connect the DC voltmeter to the cathode of
11042 on the Local Unit, and set the RF PWR.
control fully clockwise (maximum).
©) Adjust VR1015 on the Local Unit for 3.5 V
on the voltmeter.
Reverse ALC (SWR Turndown)
Connect the inline wattmeter and a 16.6-0
dummy load (or three 50-Qs in parallel) to
the antenna jack, and set the RF PWR control
fully clockwise (maximum).
G With the transceiver set to the CW mode on
14.200 MHz, key the transmitter and adjust
VR1008 on the Local Unit for 40+2 watts on
the wattmeter.
SWR Meter Calibration
GF With the 16.6-2 dummy load (or three 50-
Qs in parallel) connected to the antenna jack,
and the RF PWR control set fully clockwise
(maximum), tune to 3.500 MHz, CW mode,
and press the SWR meter selector button.
Gi Key the transmitter and adjust VR3002 on
the Display Unit so the meter indicates 3.0
SWR.
SSB Modulator Balance
O With the transceiver tuned to 14.2 MHz,
USB mode, connect the 50-dB attenuator
and spectrum analyzer (or 50-2 dummy
load and sampling coupler) to the antenna
jack. Alternatively, a separate receiver can
be used, with the transceiver connected to
the dummy load.
Set the MIC control fully cew (minimum),
key the transmitter, and adjust VR1020 on
the Local Unit for minimum power output
(carrier leakage, should be less than —50.
dB) as indicated on the analyzer or external
receiver.
AM Carrier Level
© Tune the transceiver to 3.5 MHz, AM mode,
and connect the wattmeter and 50-Q
dummy load to the antenna jack.
Set the RF PWR control fully cew (mini-
mum), key the transmitter, and with no
modulation, adjust VR1018 on the Local
Unit for 5 watts on the wattmeter.
©) Tum the RF PWR control fully clockwise,
press the ALC meter selector button, key
the transmitter and confirm that the ALC
meter deflects.
Speech Processor Check
With the wattmeter and dummy load con-
nected to the antenna jack and the RF PWR
control fully clockwise, tune to 14.200 MHz,
USB mode. Inject 2 mV at 1 KHz from the AF
generator to the microphone jack.
© Set the MIC gain and COMP controls to their
12 o'clock positions, and press the PROC
button. Then key the transmitter and con-
firm 100 watts on the wattmeter.
FM Carrier Frequency
O With the dummy load connected to the an-
tenna jack, connect the frequency counter to
TP2005 on the RF Unit. Tune to 14.200 MHz,
FM mode, and set the RF PWR control fully
cew (minimum).
G Key the transmitter and adjust L2082 on the
RF Unit for 70.455 MHz +50 Hz on the
counter.
FM & CTCSS Deviation
© Connect the attenuator and linear detector
to the antenna jack.
Gi Tune to 29.200 MHz, FM mode. Select the
(default) 88.5-Hz subaudible tone, and
FT-890 Technical Supplement Alignment
Te!
press the RPT/T switch to activate CTCSS
operation.
O Key the transmitter and, with no micro-
phone modulation, adjust VR2009 on the
RF Unit for + 0.7-kHz deviation (+ 100 Hz).
Gi Inject 10 mV at 1 kHz from the AF generator
to pin 8 of the microphone jack, key the
transmitter, and adjust VR2008 on the RF
Unit for +2.3-KHz deviation (+ 100 Hz).
GJ Press the RPT/T switch again to turn it off.
FM Mic Gain
G With the attenuator and linear detector con-
nected to the antenna jack, and with the
transceiver tuned to 29.000 MHz, FM mode,
inject 1.5 mV at 1 kHz from the AF gener-
ator to pin 8 of the microphone jack.
O Key the transmitter and adjust VR1022 on
the Local Unit for +1.75-kz deviation (t
100 Hz).
‘Transmitter Carrier Point
© Temporarily solder across split pad JW3001
on the Display Unit.
© Connect the AF signal generator to pin 8 of
the microphone jack, and set for 3 mV injec-
tion at 1 kHz. Set the transceiver to 14.200
MHz, USB mode.
C7 Press the FAST and USB buttons at the same
time to activate the carrier-point-setting
mode.
3-9
C7 Set the MIC gain and RF PWR controls fully
clockwise (maximum), and press the ALC
meter selector button.
O Key the transmitter and adjust the AF injec-
tion frequency for maximum output power,
and then adjust the injection level to just
above the point where the ALC meter indi-
cation no longer rises.
Gi Adjust the MIC gain control for 80 watts on
the wattmeter.
© Tune the AF generator to 370 Hz, and adjust
the transceiver frequency so that 20 watts
output is obtained.
© Unkey the transmitter, press the USB mode
button, and confirm that the display has
returned to normal.
© Select LSB mode, and retune, if necessary, to
14.200 MHz. Then press the FAST and USB
buttons at the same time to activate the car-
rier-point-setting mode again.
© Return the MIC gain control to maximum
position, and return the injection level to 3
mV.
O Beginning with the 5th step above (“Key the
transmitter...”), repeat the same adjust-
ments while the transmitter is keyed. After
unkeying the transmitter, press the LSB
mode button, and confirm that the display
has returned to normal.
Gi Remove the solder from JW3001.
FT-890 Technical Supplement Alignment
RF Unit Alignment Diagram
P2001
Ist LO: RF Voltmeter (>900mV)
a Ist Mixer Balance Connect DC Voltmeter for NB
029
TX IF transformer
——
vR2001 vR2002 P2005 FM Carrier Frequency (70.455MHz)
2002
2nd LO: RF Voltmeter (>400mV)
THM RX input: Sian! Gonrator
RX IF transformers,
— 72005 ——
i
1 12009 |
L ra010 12082 FM Carrier Frequency
aa R208 FM Deviation
—_]
R209. CTCSS Deviation
L 2012 —__|
R205 S-Meter Threshold
me 'VR2006 S-Meter Full-Scale
L 2024
VR2004 FM Squach The
AX IF transformers 12014 5 Saveleh Threshold
T2015 = a ae ee 8 'VR2003 RX IF Gain
‘| lef
L roo16 TX1F wartormers 3h
L yao17
Fd Mixer Balance o . 72020 72021 RX IF transformers
e200
Notch 05c: Counter & TF ranforar
(8.67MHz, >300mV) 2018 aad ‘2062 Notch Frequency
ROC IF transformers: (— 2032 Notch LO level
VRI201_ Notch Null
FT-890 Technical Supplement 10 Alignment
Local Unit Alignment Diagram
P1009
Carrier DDS Chack:
Connect Counter & RF Voltmeter
(>80mV)—L1018 in Lots <5
i042
TX Drive: DC Voltmeter
to cathode (3.5)
P1008
Ground this post
while aligning
e102 Local Unit
Rof. OSC. Frequency
‘TPI004
Ref, OSC.:
Connact Counter & RF Voltmeter
(10.48576MHz, >120mV)
|
TP1002 Main Loop IF: RF Voltmeter (>100mV)
—
re Main Loop VCV: DC Voltmeter
TC1003 Main Loop (vco2)
TC1004 Main Loop (VCO3)
TCI001 Main Loop (VCO!)
TC1005 Main Loop (VCO4)
J1001 Ist LO: Connect RF Voltmeter across 60-Q load (>400mV)
‘Sub-Loop VCO
TPI010 Sub-Loop DDS Check: RF Voltmeter (>40mV)
P1007 Sub-Loop DDS Check: Counter (60—60.1MHz)
TP1001 Sub-Loop VCV: DC Voltmeter (5V//3V)
TPIOI| Sub-Loop IF: RF Voltmeter (peak)
TP1012 Sub-Loop IF: RF Voltmeter (>10mV)
ries
stow are
‘T1002
ee
L1002_70-MHz 2nd LO: Connect Counter & RF Voltmeter
‘across 50-Q load (70MHz, >40mV)
TP1005
‘re1006—]
Jump togethor for Ext. Tuner Power
1043 Overcurrent ALC Zero:
DC Voltmeter to anode (OV)
Or
veto08
\VRI002 $88 Squelch Threshold
\VRIO22 FM Mic Gain
\VRI020 SSB MOD Balance VRI010 Ext. Tuner Power
VRIOI8 AM Carrier Level VRIOI2. Forward ALC (PO)
YVRIO01 $88 DET Balance VRI008 Reverse AL@ (SWR Turndown)
VRIOIS. TX Drive VRIOI7 ALC Meter Threshold
VRIOI3 Overcurrent ALC Zero Set VRIOI4 Overcurrent ALC.
a
FT-890 Technical Supplement Block Diagram
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FT-890 Technical Supplement Interconnection Diagram
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