Tait TM9100 Service Manual page 280

If neither the voltage nor the current measured in
Task 18 —
Shaping Filter for
the shaping filter for the power-control circuitry or the CODEC and audio
Power Control
circuitry is suspect.
Important
1.
2.
3.
4.
5.
6.
280 Transmitter Fault Finding (50W/40W Radios)
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.
Use the multimeter to measure the voltage at the
(see Figure 11.11 and Figure
FIN2 test point: 18 ± 2V (initially)
Enter the CCTM command 332 y (where y was recorded in
Check that the voltage changes to:
FIN2 test point: 1.1 to 2.7V (after entry of CCTM 332 y)
Enter the CCTM command 32 to place the radio in receive mode.
If the voltage measured above is correct, go to
to "CODEC and Audio Fault Finding" on page
Check IC301 and the surrounding shaping-filter circuitry
(see Figure 11.11 and Figure
confirm the removal of the fault, and go to
page 147. If the repair failed, replace the main-board assembly and go
to "Final Tasks" on page
Task 16
FIN
11.12). The voltage should be:
Step
371.
11.12). If a fault is found, repair it,
"Final Tasks" on
147.
© Tait Electronics Limited August 2005
is correct, then
Task 12.
2 test point
Task 12).
6. If it is not, go
TM9100 Service Manual