TB7100 Service Manual Transmitter Fault Finding (50W/40W) 327
© Tait Electronics Limited October 2005
Task 28 —
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 14.21 and Figure 14.22). (Use an RFP5401A
RF probe or the equivalent.) The required voltage should be as given
in Table 14.8 (B1 band), Table 14.9 (H5) or Table 14.10 (H7).
2. If the voltage is correct, go to Task 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 14.21 and
Figure 14.22).
5. Repair any fault revealed by the above checks. Replace Q3502
(see Figure 14.21 and Figure 14.22) if none of the other
components is faulty.
6. Confirm the removal of the fault and go to “Final Tasks” on
page 123. If the repair failed, replace the main-board assembly and go
to “Final Tasks” on page 123.
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