Check Components Of Lpf - Tait TM9100 Service Manual

If there are no faults in the final RF signal path up to and including the PIN
Task 35 —
Check Components
switch, then the fault should lie in the LPF. Check the LPF as follows:
of LPF
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
314 Transmitter Fault Finding (50W/40W Radios)
If not already done, remove the
Connect the RF connector to the test set.
Check the capacitors and inductors of the LPF between the PIN
switch and the RF connector. See
open circuits, and faulty components. Repair any fault.
In the case of the B1 band, replace the
Enter the CCTM command 326 5 to set the transmitter power level
to the maximum.
Enter the CCTM command 101 x x 0, where x is the lowest
frequency (in hertz) for maximum power, as given in
(B1 band), Table 11.9 (H5) or
Enter the CCTM command 33 to place the radio in transmit mode.
Measure the RF output power. This should be:
RF output power: more than 70W (B1 band)
more than 60W (H5, H7 bands)
Enter the CCTM command 32 to place the radio in receive mode.
Enter the CCTM command 101 x x 0, where x is the highest
frequency (in hertz) for maximum power, as given in
(B1 band), Table 11.9 (H5) or
Repeat Step 7 to Step 9.
If the power in both the above cases exceeds 70W (B1) or 60W
(H5, H7), the fault has been rectified; go to
page 147. If it does not, the repair failed; replace the main-board
assembly and go to "Final Tasks" on page
can.
LPF TOP
Figure 11.30. Check for shorts,
can before continuing.
LPF TOP
Table 11.8
Table 11.10 (H7).
Table 11.8
Table 11.10 (H7).
"Final Tasks" on
147.
TM9100 Service Manual
© Tait Electronics Limited August 2005