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TM9100 Service Manual Transmitter Fault Finding (25W Radios) 351

13. Confirm the removal of the fault and go to “Final Tasks” on

page 147. If the repair failed, replace the main-board assembly and go

to “Final Tasks” on page 147.

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 12.9), C310, R324 and R327

(see Figure 12.11) 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 12.11).

3. Confirm the removal of the fault and go to “Final Tasks” on

page 147. If the repair failed, replace the main-board assembly and go

to “Final Tasks” on page 147.

Tait TM9100 Service Manual

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