Pa Unit Alignment; Pre Driver Section Idling Current Alignment; Driver Section Idling Current Alignment - Vertex Standard VX-1700 Series Service Manual

Alignment

PA Unit Alignment

P -D S I
Connect the 50 Ohm Dummy Load to the ANT
jack.
Remove the shorting-plug from J2003 on the PA
Unit, then connect the DC Ammeter to J2003 (pin
1: "–" lead, pin 2: "+" lead).
Set VR2001 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 VR2001 for 300 mA (± 30 mA) on the DC
Ammeter.
Disconnect the DC Ammeter, and replace the
shorting-plug into J2003.
MIC J
TC
2001
TP
2018
14
C A
P
PA U A
D S I
Connect the 50 Ohm Dummy Load to the ANT
jack.
Remove the shorting-plug from J2004 on the PA
Unit, then connect the DC Ammeter to J2004 (pin
1: "–" lead, pin 2: "+" lead).
Set VR2002 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 VR2002 for 300 mA (± 30 mA) on the DC
Ammeter.
Disconnect the DC Ammeter, and replace the
shorting-plug into J2004.
P
C A
TP
2020
TP
2021
J
2004
VR
2003
VR
2002
J
2003
VR
2001