Final Section Idling Current Alignment; Cm Coupler Balance - Vertex Standard VX-1700 Series Service Manual

F S I
Connect the 50 Ohm Dummy Load to the ANT
jack.
Remove the solder jumper which is connected
between TP2020 and TP2021 on the PA Unit, then
connect the "+" lead of the DC Ammeter to
TP2020 and the "–" lead to TP2021.
Set VR2003 on the PA Unit fully counter-clock-
wise.
Tune the radio to 7.500 MHz, USB mode.
Key the transmitter (connect pin 3 of the MIC
jack to GND) with no microphone input, and
adjust VR2003 for 300 mA (± 30 mA) on the DC
Ammeter.
Disconnect the DC Ammeter, and re-connect the
solder jumper between TP2020 and TP2021.
C A CM C B
Connect the 50 Ohm Dummy Load and Inline
Wattmeter to the ANT jack, and connect the CW
keyer to the KEY jack.
Connect the DC voltmeter to TP2018 ("+" lead,
"–" lead: GND) on the PA Unit.
Tune the radio to 29.000 MHz, A1A mode.
Key the transmitter (close the CW key).
Now adjust TC2001 on the PA Unit for minimum
indication on the DC voltmeter.
Alignment
15