Tait TP9100 - Page 257

TP9100 Service Manual Receiver Fault Finding 257
© Tait Electronics Limited May 2005
Tas k 6 —
Check Matching
Circuitry
Having excluded the IF amplifier, check the matching circuitry for the
crystal filters.
1. Check all remaining components between T401 (see Figure 11.4)
and IC400 (see Figure 11.1) — these form the matching circuitry
for the crystal filters XF400 and XF401 (see Figure 11.1).
2. If the above check reveals no fault, go to Step 3. If there is a fault,
repair it and go to Step 6.
3. Remove the
RX FE TOP and PA LPF BOT cans.
4. Make a visual check of the components in the receive path of the
PIN switch and LPF circuits.
5. If the visual check reveals an obvious fault, repair it and go to Step 6.
If there is no obvious fault, go to Tas k 7
.
6. Recalibrate the receiver using the calibration application.
7. Confirm the removal of the fault and go to “Final Tasks” on
page 134. If the repair failed, go to Ta sk 7
.
Figure 11.4 Receiver circuitry under the MIXER TOP can (top side)