Repair Pll Feedback; Synthesizer Circuitry Under The Vco Bot Can - Tait TM9100 Service Manual

If both the minimum and maximum receive frequencies are correct, the
Task 18 —

Repair PLL feedback

PLL feedback is suspect.
1.
2.
3.
4.
5.
Figure 9.10
196 Frequency Synthesizer Fault Finding
Resolder R542 in position (see
Remove the can.
VCO BOT
Replace the components C567, R574 (see
(see Figure 9.9).
Also check the second stage of the receive buffer amplifier based on
IC5100 (see Figure 9.10). Repair any fault.
Confirm that the fault in the radio has been removed. If it has, go to
"Final Tasks" on page 147. If it has not, replace the main-board
assembly and go to "Final Tasks" on page
Synthesizer circuitry under the
(UHF radio, bottom side)
Q5001
Figure 9.9).
Figure 9.10) and IC503
147.
can
VCO BOT
TM9100 Service Manual
© Tait Electronics Limited August 2005