Motorola GP328 Detailed Service Manual

6E-30 Troubleshooting charts
Level >
+2 dBm
Check signal at
collector of Q201
No
Yes
Check L204, L211, L212,
L215, C221, C228, C229,
C230,C231, C235,C297,
R204, R234, R238
Troubleshooting Flow Chart for VCO
Check signal at
collector of Q201
No RX LO or No
signal at U205 Pin
32 in RX
No TX LO or No
signal at U205 Pin
32 in TX
Level >
+10 dBm?
Check signal at
drain of Q203
Level >
-3 dBm?
Check signal at
drain of Q202
and Q204
Level >
+7 dBm?
No
Yes
Replace Q201
Yes
Yes
Done
Check DC volt-
age across R203
Problem
fixed?
Replace Q203
Check C215, C216,
L207, L208, L209,
U203
Level >
500 mV ?
Check C200, C202, C203,
C222, C223, L201, L203,
TR201, CR202
Replace Q202
and Q204
Yes
Yes
No
No
NoNo

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)