Tait TP9100 - Page 242

242 Transmitter Fault Finding TP9100 Service Manual
© Tait Electronics Limited May 2005
Task 19 —
Output of
Exciter Circuit
If the synthesizer output is correct, check the output at Q107 (B1 band) or
Q100 (H5, H6) of the exciter circuit.
1. If not already done, remove the
PA BOT can.
2. Enter the CCTM command 326 x, where x defines the power level
selected in Task 18.
3. Enter the CCTM command 101 x x 0, where x is the frequency
selected in Task 18.
4. Enter the CCTM command 33 to place the radio in transmit mode.
5. Use an RFP5401A RF probe or the equivalent to measure the
RF voltage after C146 (B1 band) or C110 (H5, H6) at the exciter
output measuring point in Figure 10.8. The required voltage should
be as given in Table 10.6 (B1), Table 10.7 (H5), or Table 10.8
(H6).
6. Enter the CCTM command 32 to place the radio in receive mode.
7. If the voltage measured above is correct, go to Tas k 19
. If it is not, go
to Step 8.
8. Check the components around Q107 (B1 band) or Q100 and IC100
(H5, H6) (see Figure 10.10).
9. Repair any fault revealed by the above checks.
10. Confirm the removal of the fault and go to “Final Tasks” on
page 134. If the repair failed, replace the main board and go to “Final
Tasks” on page 134.