Motorola GP328 Detailed Service Manual

6E-28 Troubleshooting charts
START
No Power
Is Current
~2A?
Is control voltage
at U101 Pin 1 > 5
Check PCIC
1. Check Pin Diodes
2. Check Harmonic Filter
3. Check PA Bias
Inspect/Repair Tx.
Output Network
Is Power
OK?
Done
Check input to
U101, Pin 16
Is voltage
>1Vpp?
Troubleshoot
VCO
Check level
U101, Pin 6
Is level
>5 Vpp?
Is Power
OK?
Replace
Q101
Yes
No
No
Yes
No
Yes
No
Yes
Yes
No
Yes
No
Troubleshooting Flow Chart for Transmitter
Check components
around U101
Is Power
OK?
Done
Replace
U101
No
Check components
around Q100
Yes
Done

Motorola GP328 Specifications

General

Channel Capacity	16 channels
Operating Temperature	-30°C to +60°C
Sealing	IP54
Frequency Range	136-174 MHz (VHF), 403-470 MHz (UHF)
Power Output	1-5W (VHF), 1-4W (UHF)
Dimensions	137 x 57.5 x 37.5 mm
Power Supply	7.5V
Battery Life	8 hours (High Power), 11 hours (Low Power) with standard NiMH battery
Weight	420g (with standard battery)