Tait TM8100 mobiles Service Manual page 371

Task 20 —
Biasing of
PA Driver—
test point
SET PWR
TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
If the voltage at the
DRV
point.
1. Check the voltage at the
SET PWR test point: 2 to5V
2. If the voltage is correct, go to
3. If the can has already been removed, go to
PAD TOP
not, go to Step
Enter the CCTM command 32 to place the radio in receive mode.
4.
5. Remove the
PAD TOP
Enter the CCTM command 33 to place the radio in transmit mode.
6.
7. Check the voltage on the gate of Q306 (see
gate of Q306: 2 to 5V
Enter the CCTM command 32 to place the radio in receive mode.
8.
9. If the voltage is correct, replace Q306; confirm the removal of the
fault and go to
test point is correct, check that at the
test point (see
SET PWR
Step 3. If it is not, go to
4.
can.
"Final Tasks" on page
Transmitter Fault Finding (25W)
SET PWR
Figure 12.8):
Task
Step 7. If it has
Figure 12.10):
163. If it is not, go to
test
21.
Task 23.
371