Vertex Standard VX-1700 Series, Service Manual

Page: 15 / 116

15
F
INAL
S
ECTION
I
DLING
C
URRENT
A
LIGNMENT
ˆ
Connect the 50 Ohm Dummy Load to the ANT
jack.
ˆ
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.
ˆ
Set VR2003 on the PA Unit fully counter-clock-
wise.
ˆ
Tune the radio to 7.500 MHz, USB mode.
ˆ
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 Amme-
ter.
ˆ
Disconnect the DC Ammeter, and re-connect the
solder jumper between TP2020 and TP2021.
CM C
OUPLER
B
ALANCE
ˆ
Connect the 50 Ohm Dummy Load and Inline
Wattmeter to the ANT jack, and connect the CW
keyer to the KEY jack.
ˆ
Connect the DC voltmeter to TP2018 (“+” lead,
“–” lead: GND) on the PA Unit.
ˆ
Tune the radio to 29.000 MHz, A1A mode.
ˆ
Key the transmitter (close the CW key).
ˆ
Now adjust TC2001 on the PA Unit for minimum
indication on the DC voltmeter.
Alignment