UNIDEN 2020
Sid 8 (26)
CAUTION
(1) During transmitter tuning, do not keep the final tube running untuned for a long period
of time. Make quick adjustment of PLATE and LOAD controls.
(2) High voltage is generated especially inside of the final amplifier and also bottom of the
PA compartment. Don’t touch part of them.
2. PA IDLING CURRENT ADJUSTMENT
2-1. Test Equipment Required
(1) None
2-2. Adjustment Procedure.
(1) Set MODE SWITCH to USB.
(2) Set STANDBY SWITCH to MANU
(3) Adjust the BIAS potentiometer, R16 on the rear panel so as to indicate
GREEN TRIANGLE MARK on the meter.
3. GENERATOR UNIT ALIGNMENT
3-1. Test Equipment Required
(1) RF voltage Meter
(2) AF milli-volt Meter (mV)
(3) Audio Generator (AG)
(4) Frequency Counter.
(5) Oscilloscope
3-2. Preparations
Take out Generator Unit (PC-080) and put a SERVICE EXTENSION BOARD
in its place, then connect the GENERATOR UNIT to the EXTENSION
BOARD.
3-3. (1) Connect RF voltage meter the (RF VTVM) to Pin 16 of J18.
(2) Adjust L510 to get maximum meter readings.
(3) Remove RF VTVM and connect frequency counter to Pin 16 of J18.
(4) Set MODE SWITCH to USB, and adjust trimmer capacitor C541 so that the
frequency counter indicates 6,187.000 kHz.
(5) Set MODE SWITCH to TUNE, and adjust trimmer capacitor C542 so that
the counter reading indicates 6,187.750 kHz.
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