13.8V Power Supply - Tait TM9100 Service Manual

First check the power supply from the power connector.
Task 1 —

13.8V Power Supply

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
TM9100 Service Manual
© Tait Electronics Limited August 2005
Obtain a needle probe to use for measurements of the power supply
at the PA driver and PAs. If none is available, remove the
cans.
PAD TOP
Set the DC power supply to 13.8V, with a current limit of 10A.
Program the radio with the highest frequency in the radio's frequency
band: Enter the CCTM command 101 x x 0, where x is the frequency
in hertz. The required values for the different frequency bands are
given in Table 11.2.
Enter the CCTM command 326 5 to set the radio to maximum
power.
Attempt to place the radio in transmit mode. Enter the CCTM
command 33.
If the radio enters the transmit mode, continue with
a C03 error is displayed in response to the command 33, go to
in "Transmitter RF Power" on page
Measure the voltage at the point on L310 shown in
(B1 band) or Figure 11.3
common drain of Q309 and Q310, and should be:
common drain of Q309 and Q310: more than 13V DC
Also measure the voltage at the point on L306 shown in
(B1 band) or Figure 11.5
drain of Q306, and should be:
drain of Q306: more than 13V DC
Enter the CCTM command 32 to place the radio in receive mode.
If the power supply measured in
to Task 2. If it is, go to Task
Transmitter Fault Finding (50W/40W Radios)
262.
(H5, H7 bands). This is the supply at the
(H5, H7 bands). This is the supply at the
Step 7 and Step 8 is not correct, go
3.
and
PAF TOP
Step 7. If instead
Task 7
Figure 11.2
Figure 11.4
249