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298 Transmitter Fault Finding (40W/50W) TM8100/TM8200 Service Manual

11. Repair any fault revealed by the above checks. Replace IC303 if none

of the other components is faulty (see Figure 11.8 and

Figure 11.9).

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

page 157. If the repair failed, replace the board and go to “Final

Tasks” on page 157.

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 11.8 and Figure 11.9), C310, R324 and

R327 (see Figure 11.11 and Figure 11.12) 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 11.11 and Figure 11.12).

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

page 157. If the repair failed, replace the board and go to “Final

Tasks” on page 157.

Figure 11.14 Components of concern on the bottom-side of the main board (VHF)

B1 BAND

C319

R396

R341

COPPER PLATE

NB BOT CAN

VCO BOT CAN

D311

D TX INH TEST POINT

Tait TM8110 Service Manual

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