Motorola GP344 - Troubleshooting Chart for Transmitter

2-6 TROUBLESHOOTING CHARTS
START
No LO?
Tx Carrier?
VCO OK
Check
R3829
TRB = 3.2V?
Pin 10
>1V?
L3831,
L3832,
L3833 O/
C?
Change
L3831, L3832
Change
U3801
AUX 3
High?
Check U3701
Pin 2 for 3.2V
Pin 19
=0V
AUX 3
Low?
Change
U3801
V ctrl 0V
or 13V?
L3821,
L3822,
L3823 Open
Circuit?
Change
U3801
Change
L3821,
L3822,
L3823,L243
Change
U3701
Check for faulty parts or dry
joints of L3812 C3806,
R3806, R3802 & L3801
A
A
No
No
Yes
Yes
Yes
No
No
Yes
Yes
Yes
No
Yes
No
No
Yes
Yes
No
No
Check R3811,
L3811 for dry joint
or faulty
No
Yes
Figure 2-5 Troubleshooting Chart for Transmitter