350
Transmitter Fault Finding (25W)
TM8100/TM8200 Service Manual
© Tait Electronics Limited
June 2006
Task 17 —
Shaper and
Level Shifter
If the voltage measured in
is correct but not the current, either the
second PA or the shaper and level shifter for the PA is suspect.
Important
Ensure that the current limit on the DC supply is 2A.
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.
1.
If the
PAF
TOP
can has already been removed, go to
. If it has not,
2.
Enter the CCTM command
32
to place the radio in receive mode.
3.
Remove the
PAF
TOP
can.
4.
Enter the CCTM command
33
to place the radio in transmit mode.
5.
Enter the CCTM command
332
y
(where
y
was recorded in
6.
Check that the voltage at the gate of
Q309
is (see
7.
Enter the CCTM command
32
to place the radio in receive mode.
8.
If the voltage is correct,
Q309
is faulty; replace the board and go to
9.
Check the circuitry between pin 8 of
IC301
and the gate of
Q309
(see
). If a fault is found, repair it, confirm the removal
of the fault, and go to
. If the repair failed
or Q309 itself is faulty, replace the board and go to
gate of Q309: 2 to 5V
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...
