Troubleshooting Flow Chart For Synthesizer - Motorola M11URD6CB1_N Service Manual

Troubleshooting
Troubleshooting Charts
Replace U5700.
Check C5738, C5724,
C5713 and L5709.
Troubleshooting Flow Chart
for Synthesizer
9-4
SYNTHESIZER DEVIATION
Start
Is MOD_IN
No
present
Controller
at C5700?
Is there
212mV on
C5750?
Check synthesizer
loop filter.
SYNTHESIZER PENDULUM
Start
Is 2.1 MHz
present
at R5731?
No
Is 16.8 MHz
present
at U5700-10?
No
Yes
Is 5V present
at U5700-13?
No
Is 5V present
at L5700?
No
Is 5V present
at U5703-2?
No
Is 9.3V
No
present
at U5703-1?
GTX LTR/Privacy Plus 800 MHz Mobile Service Manual
No
Replace U5702.
Yes
Yes
Yes
Replace R5731.
Is 16.8MHz
Yes
present
at U5700-10?
Replace U5702.
Yes
Replace L5700.
Yes
Check L5704.
Yes
Replace U5703.
6880905Z99-O
No
Check C5733
and R5715.
Yes
June, 2000