310 Transmitter Fault Finding (>25W) TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
Task 2 3 —
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 11.9 and Figure 11.10), C310, R324 and
R327 (see Figure 11.13 to Figure 11.15) between the power-con-
trol 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 11.13 to Figure 11.15).
3. Confirm the removal of the fault and go to “Final Tasks” on
page 163. If the repair failed, replace the board and go to “Final
Tasks” on page 163.
Figure 11.17 Components of concern on the bottom-side of the main board (VHF)
B1 BAND
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