TM9100 Service Manual Transmitter Fault Finding (50W/40W Radios) 291
© Tait Electronics Limited August 2005
Task 25 —
Shaping Filter
In this task any faults in the shaping-filter circuitry will be located.
1. With the radio still in transmit mode, measure the voltage at pin 1 of
IC301 (see Figure 11.11 and Figure 11.12) in the shaping-filter
circuit. The voltage should be:
2. Enter the CCTM command 32 to place the radio in receive mode.
3. If the voltage measured in Step 1 is correct, go to Step 4. If it is not,
go to Step 5.
4. Check the components R334 (see Figure 11.11 and Figure 11.12)
and C319 (see Figure 11.18 and Figure 11.19) and go to Step 6.
5. Check the components between the
PWR test point and pin 1 of
IC301 (see Figure 11.11 and Figure 11.12) and go to Step 6.
6. Repair any fault revealed by the checks in Step 4 and Step 5. Replace
IC301 if none of the other components is faulty.
7. Confirm the removal of the fault and go to “Final Tasks” on
page 147. If the repair failed, replace the main-board assembly and go
to “Final Tasks” on page 147.
pin 1 of IC301: 4.8 ± 0.5V
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