TM8100/TM8200 Service Manual
Transmitter Fault Finding (40W/50W)
287
© Tait Electronics Limited
June 2006
Task 15 —
Shaping Filter for
Power Control
If neither the voltage nor the current measured in
is correct, then
the shaping filter for the power-control circuitry or the CODEC and audio
circuitry 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
.
Failure to do so may result in the destruction of the PAs.
1.
Use the multimeter to measure the voltage at the
FIN
1
test point
(see
and
). The voltage should be:
2.
Enter the CCTM command
331
x
(where
x
was recorded in
).
3.
Check that the voltage changes to:
4.
Enter the CCTM command
32
to place the radio in receive mode.
5.
If the voltage measured above is correct, go to
. If it is not, go
to
“CODEC and Audio Fault Finding” on page 381
.
6.
Check
IC301
and the surrounding shaping-filter circuitry
(see
and
). If a fault is found, repair it,
confirm the removal of the fault, and go to
. If the repair failed, replace the board and go to
.
FIN1 test point: 18
±
2mV (initially)
FIN1 test point: 1.1 to 2.7V (after entry of CCTM 331
x
)
Summary of Contents for TM8235
Page 1: ...TM8100 mobiles TM8200 mobiles Service Manual MMA 00005 04 Issue 4 June 2006...
Page 10: ...10 TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 62: ...62 Description TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 148: ...148 Disassembly and Reassembly TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 162: ...162 Servicing Procedures TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 178: ...178 Interface Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 258: ...258 Receiver Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 446: ...446 Spare Parts TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
