Tait TM8100 mobiles Service Manual page 295

Task 14 —
Shaper and
Level Shifter
TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
If the voltage measured in
first PA or the shaper and level shifter for the PA is suspect.
Important
Ensure that the current limit on the DC supply is 3A.
And, when entering the CCTM command 331 x, do not
specify a value x higher than that recorded in
ure to do so may result in the destruction of the PAs.
1. 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.
2.
3. Remove the
PAF TOP
Enter the CCTM command 33 to place the radio in transmit mode.
4.
5. Enter the CCTM command 331 x (where x was recorded in
6. 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.
7.
8. If the voltage measured above is correct, Q310 is faulty; replace the
board and go to
Step 9.
9. Check the circuitry between pin 14 of IC301 and the gate of Q310
(see Figure 11.11). If a fault is found, repair it, confirm the removal
of the fault, and go to
or Q310 itself is faulty, replace the board and go to
page 163.
Task 13 is correct but not the current, either the
can.
"Final Tasks" on page
"Final Tasks" on page
Transmitter Fault Finding (>25W)
Task 12. Fail-
Step 5 If it has not,
Task
Figure 11.11):
163. If it is not correct, go to
163. If the repair failed
"Final Tasks" on
12).
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