Tait TM9100 Service Manual page 279

If the voltage measured in
Task 17 —
Shaper and
second 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 16
Ensure that the current limit on the DC supply is 3A.
And, when entering the CCTM command 332 y, do not
specify a value y 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
not, 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 332 y (where y was recorded in
Check that the voltage at the gate of Q309 is (see
Figure 11.14):
gate of Q309: 2 to 5V
Enter the CCTM command 32 to place the radio in receive mode.
If the voltage is correct, Q309 is faulty; replace the main-board
assembly and go to "Final Tasks" on page
Step 9.
Check the circuitry between pin 8 of IC301 and the gate of Q309
(see Figure 11.13 and Figure
confirm the removal of the fault, and go to
page 147. If the repair failed or Q309 itself is faulty, replace the main-
board assembly and go to
Transmitter Fault Finding (50W/40W Radios)
is correct but not the current, either the
Figure 11.13
147. If it is not, go to
11.14). If a fault is found, repair it,
"Final Tasks" on
"Final Tasks" on page 147.
Task 12.
Step 5. If it has
Task 12).
and
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