TM8100/TM8200 Service Manual
Transmitter Fault Finding (40W/50W)
315
© Tait Electronics Limited
June 2006
Task 32 —
Repair Circuitry
If the RF output power measured in
is low, there is a fault in the
circuit between the common drain of the PAs and the test capacitor.
1.
If not already done, remove the
PAF
TOP
can.
2.
Check for faulty, shorted or misplaced components in the circuit
between the test capacitor and the common drain of
Q309
and
Q310
(see
3.
Repair any fault revealed by the above checks and go to
. If no
fault could be found, go to
.
4.
Remove the test lead and test capacitor, resolder the coupling
capacitors
C348
,
C349
and
C350
in position (see
),
and go to
.
5.
With the test lead still connected to the test set, enter the CCTM
command
326 5
to set the transmitter power level to the maximum.
6.
Enter the CCTM command
101
x x
0
, where
x
is the lowest
frequency (in hertz) for maximum power, as given in
(B1),
(H7).
7.
Enter the CCTM command
33
to place the radio in transmit mode.
8.
Measure the RF output power. This should be:
9.
Enter the CCTM command
32
to place the radio in receive mode.
10.
Enter the CCTM command
101
x x
0
, where
x
is the highest
frequency (in hertz) for maximum power, as given in
(B1),
(H7).
11.
Repeat
12.
Remove the test lead and test capacitor, and resolder the coupling
capacitors
C348
,
C349
and
C350
in position (see
).
13.
If the power in both the above cases is now correct, the fault has been
rectified; go to
. If it is not, the repair
failed; replace the board and go to
RF output power: more than 70W (VHF)
more than 60W (UHF)
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...
