Motorola GM Series Service Information

Chapter 3
TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
START
Audio at
pin 8 of
U3101 ?
Check Controller
(in the case of no audio)
OR ELSE go to “B”
Ye s
No
Spray or inject 44.85MHz
into XTAL Filter FL3101
Audio heard ?
B
Ye s
No
Check 2nd LO
(44.395MHz) at C3135
LO present ?
B
Ye s
Check voltages on
U3101
Biasing OK ?
No
No
A
Ye s
Check Q3102 bias
for faults
Replace Q3102
Go to B
Ye s
No
Check circuitry
around U3101.
Replace
U3101 if defect
Check circuitry around Y3101 Re-
place Y3101 if defect
Voltages
OK?

Motorola GM Series Specifications

General

Brand	Motorola
Model	GM Series
Category	Radio
Language	English