Troubleshooting Flow Chart For Vco - Motorola GP328 Plus Service Manual

5A-36
No
Check R3811, L3811
for dry joint or faulty

Troubleshooting Flow Chart for VCO

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