Tait TM9100 Service Manual page 339

If the voltage measured in
Task 14 —
Shaper and
first PA or the shaper and level shifter for the PA is suspect.
Level Shifter
Important
1.
2.
3.
4.
5.
6.
7.
8.
9.
TM9100 Service Manual
© Tait Electronics Limited August 2005
Task 13
Ensure that the current limit on the DC supply is 2A.
And, when entering the CCTM command 331 x, do not
specify a value x higher than that recorded in
Failure to do so might result in the destruction of the PAs.
If the can has already been removed, go to
PAF TOP
go to Step 2.
Enter the CCTM command 32 to place the radio in receive mode.
Remove the can.
PAF TOP
Enter the CCTM command 33 to place the radio in transmit mode.
Enter the CCTM command 331 x (where x was recorded in
Check that the voltage at the gate of Q310 is (see
gate of Q310: 2 to 5V
Enter the CCTM command 32 to place the radio in receive mode.
If the voltage measured above is correct, Q310 is faulty; replace the
main-board assembly and go to
correct, go to Step 9.
Check the circuitry between pin 14 of IC301 and the gate of Q310
(see Figure 12.10). If a fault is found, repair it, confirm the removal
of the fault, and go to "Final Tasks" on page
or Q310 itself is faulty, replace the main-board assembly and go to
"Final Tasks" on page 147.
Transmitter Fault Finding (25W Radios)
is correct but not the current, either the
Step
Figure
"Final Tasks" on page
147. If the repair failed
Task 12.
5. If it has not,
Task 12).
12.10):
147. If it is not
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