Repair Receive Vco - Tait TM9100 Service Manual

If either or both the minimum and maximum receive frequencies are
Task 19 —

Repair Receive VCO

incorrect, the receive VCO circuitry is faulty.
1.
2.
3.
4.
5.
6.
TM9100 Service Manual
© Tait Electronics Limited August 2005
Remove the can.
VCO TOP
Check the receive VCO. The circuitry is based on Q504
(see Figure 9.9).
If a fault is found, repair it and go to
to Step 6.
Repeat the frequency measurements in
If the frequencies are now correct, resolder R542 in position
(see Figure 9.9), and go to
still not correct, go to Step
Resolder R542 in position (see
board assembly and go to
Step 4. If no fault is found, go
Step 2 and
"Final Tasks" on page
6.
Figure 9.9). Replace the main-
"Final Tasks" on page 147.
Frequency Synthesizer Fault Finding
Step 4 of Task 17.
147. If they are
197