Troubleshooting Flow Chart For Transmitter - Motorola GTX 2000 Service Manual

GTX/GTX LTR/LTS 2000 Portable Radios Service Ma nual
NO
Replace PA
module
1. Check coupler U111
2. Check PIN diodes
3. Check harmonic Þlter
June 1999
Start
power
Is the
LEDÕs red light
on or not?
Is Tx B+
OK?
YES
current
OK?
Is Power Out
of pin 4 at PA
OK
YES
Inspect/repair
TX output
network
No
Inspect:
NO
1) Front cover ßexible circuit
2)Voltage regulator
YES
NO
Is biasing of
Q400 OK?
YES
Is NO
Is control
voltage high
or low?
Is PA drive
OK?
Replace PA
module
68P02945C75-A
Troubleshooting
Troubleshooting Charts
NO
Replace
Q400
YES
LOW
Troubleshoot
Power Control
circuit
HIGH
NO
Troubleshoot
VCO
YES
Troubleshooting Flow Chart
for Transmitter
4-3