308 Transmitter Fault Finding (40W/50W) TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
Task 2 8 —
Output of Second
Stage of Exciter
If the output of the first stage of the exciter circuit is correct, check that of
the second stage at C3509:
1. With the radio still in transmit mode, measure the RF voltage after
C3509 (see Figure 11.17). (Use an RFP5401A RF probe or the
equivalent.) The required voltage should be as given in Table 11.8
(B1), Table 11.9 (H5) or Table 11.10 (H7).
2. If the voltage is correct, go to Tas k 30
. If it is not, go to Step 3.
3. Enter the CCTM command 32 to place the radio in receive mode.
4. Check the components around Q3502 (see Figure 11.17).
5. Repair any fault revealed by the above checks. Replace Q3502
(see Figure 11.17) if none of the other components is faulty.
6. 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.
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