Tait TM9100 Service Manual page 290

In this task any faults in the power-control circuitry will be located:
Task 24 —
Power Control
1.
2.
3.
4.
5.
6.
7.
290 Transmitter Fault Finding (50W/40W Radios)
Measure the voltage at pin 8 of IC303 (see
Figure 11.12) in the power-control circuit. The voltage should be:
pin 8 of IC303: 7.4 ± 0.5V
If the voltage is correct, go to
command 32 and return to
Measure the voltage at pin 10 of IC303 in the power-control circuit.
The voltage should be:
pin 10 of IC303: 4.8 ± 0.5V
If the voltage is correct, go to
Enter the CCTM command 32 to place the radio in receive mode.
Check C322, C324, R342, R347 (see
Figure 11.12) and R396 (see
the power-control circuit. Repair any fault. Replace IC303 if none
of the other components is faulty.
Confirm the removal of the fault and go to
page 147. If the repair failed, replace the main-board assembly and go
to "Final Tasks" on page
Figure 11.11
Step 3. If it is not, enter the CCTM
Task 23.
Step 5. If it is not, go to
Figure 11.11
Figure 11.18 and Figure
"Final Tasks" on
147.
© Tait Electronics Limited August 2005
and
Task 25.
and
11.19) in
TM9100 Service Manual