TB7100 Service Manual Transmitter Fault Finding (25W) 255
© Tait Electronics Limited October 2005
13. Confirm the removal of the fault and go to “Final Tasks” on
page 123. If the repair failed, replace the main-board assembly and go
to “Final Tasks” on page 123.
Task 23 —
Power Control
for PA Driver
In this task any faults in the path between the power-control circuit and the
PA driver will be located, as well as any fault with the PA driver.
1. Check for short circuits at the gate of the PA driver Q306. Check
R333, R336 (see Figure 13.9), C310, R324 and R327
(see Figure 13.11) between the power-control circuit and Q306.
2. Repair any fault revealed by the checks in Step 1. If none of the
above-mentioned components is faulty, replace Q306
(see Figure 13.11).
3. Confirm the removal of the fault and go to “Final Tasks” on
page 123. If the repair failed, replace the main-board assembly and go
to “Final Tasks” on page 123.
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