Motorola GP344 - Page 170

2-8 TROUBLESHOOTING CHARTS
START
No Power
Is There B+
Bias for Ant
switch
Check
Q3561
Is Current
OK?
Is Control Voltage
High or Low
Check PCIC
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx.
Output Network
Is Power
OK?
Done
Check Drive to
Module
Is Drive
OK?
Troubleshoot
VCO
Inspect PA Network/
Check Power Out of
U3501 at Cap C3512
Is Power
OK?
Replace U3501
Is Power
OK?
Replace Q3501
Done
Done
No
Yes
Yes
No
No
Yes
Low
High
No
Yes
Yes
No
Yes
No
Figure 2-7 Troubleshooting Chart for Voltage Control Oscillator