Motorola MTP700 - Page 121

TRANSCEIVER 400 MHz MTP700 Portable Radio / Detailed Service Manual 4.1 - 87
Synthesizer & VCO Troubleshooting (Cont.)
Unit testing is complete.
Check Loop filter:
Check for opens
or shorts.
Possible VCO problem.
Check for opens or shorts
in the VCO circuit.
A
Whether the
problem found
and fixed?
YES
NO
Check buffer:
Check for opens
or shorts.
Whether the
problem found
and fixed?
YES
NO
Unit testing is complete.
Whether the
problem found
and fixed?
YES
NO
Unit testing is complete.
WPIC
Problem
Check for the following:
2.45Vdc on R3006.
Confirm that the resonator tab is
properly soldered.
Confirm that the Varicap is in the
right direction.