228 Frequency Synthesizer Fault Finding TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
Task 29 —
Repair PLL feedback
If both the maximum and minimum VCO frequencies are correct, then the
PLL feedback is suspect.
1. Resolder R542 in position (see Figure 9.14).
2. Remove the
VCO BOT can.
3. Replace the components L510 (see Figure 9.15) and IC503
(see Figure 9.14).
Note On A4 band radios there is no L510. Replace L5010 instead.
4. Confirm that the fault in the radio has been removed. If it has, go to
“Final Tasks” on page 163. If it has not, replace the board and go to
“Final Tasks” on page 163.
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