Synthesizer Troubleshooting (Cont.) - Motorola MTH500 Service Manual

Troubleshooting

Synthesizer Troubleshooting (Cont.)

A
Possible VCO problem:
Check for opens or
shorts in the VCO circuit.
Whether the
problem found
and fixed ?
Yes
Unit testing
is complete
3 - 24
Check for the following:
2.4Vdc on R934 and on R923.
Confirm that the resonator tab
is prperly soldered.
Confirm that the Varicap is in
the right direction.
Check Loop filter:
NO
Check for opens
or shorts .
Whether the
problem found
and fixed ?
Yes
Unit testing
is complete
Check buffer:
NO
Check for opens
or shorts .
Whether the
problem found
and fixed ?
Yes
Unit testing
is complete
NO
WPIC Problem
68P02963C70-O