Motorola GP338 Plus User Manual

Troubleshooting Charts 5A-33
IF Signal at
C3200?
No
RF Signal at
T3301?
RF Signal at
R3313?
No
RF Signal at
C3306?
No
RF Signal at
C3302?
No or
Check harmonic filter L3531 & L3532,
C3532 and ant. switches D3521, D3551,
L3551, R3551, C3551, C3552, L3552
Check filter between
C3302 & C3306; program
filter to schematic test freq
and check
varactor voltages.
Inject RF into J3501
Are varactor
voltages OK?
No
Yes
Check RF amp (Q3302)
Stage.
Check filter between C3313
& T3301.
Yes
Check T3301, T3302,
CR3301, R3321, R3322,
R3323
Yes
1st LO O/P
OK?
Locked?
Yes
Check FGU
Yes
Trace IF signal
from C3200 to
Q3200. Check for
bad XTAL filter.
No
Yes
Q3200 collec-
tor OK?
IF signal
present?
Before replacing
U3220, check
U3220 voltages;
trace IF signal
path.
Yes
Check for 2.9
VDC
Is R5 present?
Check Q3721, U3701
(pin 48) voltages and
U247
No
No
No
Check U404 voltage and if
U404 can be selected by MCU
before replacing U404.
Check varactor filter.
No
Yes
Yes
Yes
A
A
B
weak RF
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)

Motorola GP338 Plus Specifications

General

Emergency Button	Yes
IP Rating	IP54
Operating Temperature	-30°C to +60°C
Frequency Range	136-174 MHz, 403-470 MHz
Power Output	5W (VHF), 4W (UHF)
Battery Life	Up to 11 hours
Keypad	Yes
Power Supply	7.5V
Signalling	MDC1200, DTMF, Quick Call II
Channel Capacity	128
Dimensions	137 x 57.5 x 37.5 mm (without antenna)
Weight	350 g (with battery)