Tait TM8100 mobiles Service Manual page 314

Task 25 —
Shaping Filter
314 Transmitter Fault Finding (>25W)
In this task any faults in the shaping-filter circuitry will be located.
1. With the radio still in transmit mode, measure the voltage at pin 1 of
IC301 (see Figure 11.9
cuit. The voltage should be:
pin 1 of IC301: 4.8 ± 0.5V
Enter the CCTM command 32 to place the radio in receive mode.
2.
3. If the voltage measured in
go to Step 5.
4. Check the components R334 (see
and C319 (see Figure 11.17
5. Check the components between the
IC301 (see Figure 11.9
6. Repair any fault revealed by the checks in
IC301 if none of the other components is faulty.
7. Confirm the removal of the fault and go to
page 163. If the repair failed, replace the board and go to
Tasks" on page
and Figure 11.10) in the shaping-filter cir-
Step 1 is correct, go to
Figure 11.9
and Figure
PWR
and Figure 11.10) and go to
163.
© Tait Electronics Limited November 2007
Step 4. If it is not,
and Figure 11.10)
11.18) and go to Step
test point and pin 1 of
Step 6.
Step 4 and Step 5. Replace
"Final Tasks" on
"Final
TM8100/TM8200 Service Manual
6.