Tait TM8100 mobiles Service Manual page 310

Task 23 —
Power Control
for PA Driver
Figure 11.17 Components of concern on the bottom-side of the main board (VHF)
COPPER PLATE
VCO BOT CAN
B1 BAND
310 Transmitter Fault Finding (>25W)
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
R327 (see Figure 11.13
trol circuit and Q306.
2. Repair any fault revealed by the checks in
above-mentioned components is faulty, replace Q306
(see Figure 11.13
3. Confirm the removal of the fault and go to
page 163. If the repair failed, replace the board and go to
Tasks" on page
D311
NB BOT CAN
Figure 11.9 and Figure
to Figure 11.15) between the power-con-
to Figure 11.15).
163.
C319
D TX INH TEST POINT
© Tait Electronics Limited November 2007
11.10), C310, R324 and
Step 1. If none of the
"Final Tasks" on
"Final
R396
TM8100/TM8200 Service Manual