Motorola GP68 Service Manual page 55

GP68 Portable Radios Service Manual
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair
TX Output
Network
Is
Power
OK?
Done
When using the (81-80377E77) housing elimi-
nator for Level III analysis, the power level
needs to be set at "minimum" on the power level
setting to avoid any damage to the radio. This
can be performed by either the STS (RVN-
4159A) transmit power tuning field, or by the
low power setting on the radio keypad. The
transmitter alignment procedures cannot be per-
formed with the housing eliminator.
March, 1997
YES
NO
YES
Troubleshoot
VCO
NOTE
Start
No
Power
Is
NO
+5vTX and TXB+
OK?
YES
Is
NO
current
OK?
VCTL
High or Low?
Check Pin
to Q101
NO
Pin
OK?
6881086C09-O
Troubleshooting Charts
Check
U303, Q152
&
U151
Is
Check
LOW
Voltages in
Power Control
Circuit
HIGH
Check
Is
YES
Voltages in
PA Line-up
Troubleshooting Flow Chart
Troubleshooting
for Transmitter
5-3