Motorola Pro Series Elite - Troubleshooting Flow Chart for VCO

UHF (Band 1 and Band 2) Troubleshooting Charts 3-21
START
No LO?
Tx Carrier?
VCO OK
Check R260
TRB = 5V?
Pin 10 >1V?
L253 O/C?
Change L253
Change U241
AUX 3 High?
Check U201 Pin 2
for 3.2V
Pin 19 =0V
AUX 4 High?
Change Q261
V ctrl 0V or
13V?
L243 Open Cir-
cuit?
Change U241
Change L243
Change U201
Check for faulty parts or dry joints of
L271, L273, C370, C386, R339 & L320
A
A
No
No
Yes
Yes
Yes
No
No
Yes
Yes
Yes
No
Yes
No
No
Yes
Yes
No
No
Check R245 for dry joint or
faulty
No
Troubleshooting Flow Chart for VCO