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Alignment
O 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.
for 6 V
Freq. (VCO#) | @TP1003
© Tune the transceiver to 29.9800 MHz
and
again adjust T1005 and T1006 alternately
several times for peak RF voltage (at least
1st Local Output Level Check
O Remove the plug from J1001 and connect a
50- resistor and RF voltmeter in its place.
©} Tune to 30.00000 MHz and confirm at least
400 mVrms on the meter. Replace the plug in
J1001.
VR4001
Final Idling Current
PA Unit (RF Power Amplifier)
Final Idling Current
Make sure the transceiver has been on for at
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 mY + 0.5 mV.
LPF Unit
CM Coupler Balance
With the 50-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)
©) 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
TP4001
Connect +Jlead of
DC Voltmeter
TP4002
Connect —jead of
DC Volimeter
100-W Power Amp (PA) Unit Test & Alignment Points
FT-890
Technical Supplement
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