Vertex Standard VX-1210 Service Manual page 25

Final Section Idling Current Alignment
r Remove the Solder jumper from JP3501 on the PA Unit,
and connect the DC Ammeter to J3506 (pin 1: "–" lead, pin
2: "+" lead) on the PA Unit.
r Select the "TX IF" channel (10.25000 MHz, USB).
r Key the transmitter with no microphone input, adjust VR3502
on the PA Unit for 100 mA ± 10 mA on the DC Ammeter.
r Disconnect the DC Ammeter, and connect JP3501 by sol-
der jumper.
VR3502
J3506
JP3501
CM Coupler Balance
r Connect the 50 W Dummy Load and Inline Wattmeter to the
ANT jack, then connect the AF Generator to the MIC IN jack
on the MIC Adapter Unit, and adjust the AF Generator to
1500 Hz.
r Connect the DC voltmeter to pin 3 of JP3003 ("+" lead,
"–" lead: GND) on the CNTL Unit.
r Select the "CM BAL" channel (29.9000 MHz, USB).
r Turn the HI/LOW (Transmitter Power) Switch to the "up-
per" position.
r Key the transmitter, then adjust the AF Generator output level
so that the Inline Wattmeter reading is approximately 20 Watts.
r Now, adjust TC3001 for minimum indication on the DC
voltmeter.
PA Unit Alignment Points
Alignment
TC3001
JP3003
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