300 Transmitter Fault Finding (40W/50W) TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
Task 2 4 —
Power Control
In this task any faults in the power-control circuitry will be located:
1. Measure the voltage at pin 8 of IC303 (see Figure 11.8 and
Figure 11.9) in the power-control circuit. The voltage should be:
2. If the voltage is correct, go to Step 3. If it is not, enter the CCTM
command 32 and return to Ta s k 23
.
3. Measure the voltage at pin 10 of IC303 in the power-control circuit.
The voltage should be:
4. If the voltage is correct, go to Step 5. If it is not, go to Ta s k 25
.
5. Enter the CCTM command 32 to place the radio in receive mode.
6. Check C322, C324, R342, R347 (see Figure 11.8 and
Figure 11.9) and R396 (see Figure 11.14 and Figure 11.15) in the
power-control circuit. Repair any fault. Replace IC303 if none of the
other components is faulty.
7. 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.
pin 8 of IC303: 7.4 ± 0.5V
pin 10 of IC303: 4.8 ± 0.5V
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