Motorola GP344 Detailed Service Manual page 256

2-6
No
Check R245 for dry
joint or faulty
No
Yes
L253 O/C?
Yes
Yes
Pin 10
>1V?
A
Yes
Pin 19
=0V
Check for faulty parts or dry
No
joints of L271, L273, C370,
AUX 4
High?
Yes
Change
Q261
Figure 2-5 Troubleshooting Chart for Voltage Controlled Oscillator
Change
U241
Change
L253
No
TRB = 5V?
No
AUX 3
High?
No
Check U201
Pin 2 for 3.2V
V ctrl 0V
or 13V?
No
C386, R339 & L320
No
Change
U201
TROUBLESHOOTING CHARTS
START
No LO?
No
Tx Carrier?
Yes
VCO OK
Check
R260
Change
L243
Yes
Yes
L243 Open
Circuit?
Yes
A
No
Change
U241