200 Frequency Synthesizer Fault Finding TP9100 Service Manual
© Tait Electronics Limited May 2005
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 9.15).
2. Remove the
VCO BOT can.
3. Check the components R567, C589, C590, and L5000
(see Figure 9.17) and IC503 (see Figure 9.15).
4. Confirm that the fault in the radio has been removed. If it has, go to
“Final Tasks” on page 134. If it has not, replace the main board and
go to “Final Tasks” on page 134.
Figure 9.17 Synthesizer circuitry under the VCO BOT can (VHF radio, bottom side)
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