314
Transmitter Fault Finding (>25W)
TM8100/TM8200 Service Manual
© Tait Electronics Limited
November 2007
Task 25 —
Shaping Filter
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
and
Figure 11.10
) in the shaping-filter cir-
cuit. The voltage should be:
2.
Enter the CCTM command
32
to place the radio in receive mode.
3.
If the voltage measured in
Step 1
is correct, go to
Step 4
. If it is not,
go to
Step 5
.
4.
Check the components
R334
(see
Figure 11.9
and
Figure 11.10
)
and
C319
(see
Figure 11.17
and
Figure 11.18
) and go to
Step 6
.
5.
Check the components between the
PWR
test point
and pin 1 of
IC301
(see
Figure 11.9
and
Figure 11.10
) and go to
Step 6
.
6.
Repair any fault revealed by the checks in
Step 4
and
Step 5
. Replace
IC301
if none of the other components is faulty.
7.
Confirm the removal of the fault and go to
“Final Tasks” on
page 163
. If the repair failed, replace the board and go to
“Final
Tasks” on page 163
.
pin 1 of IC301: 4.8
±
0.5V
Summary of Contents for TM8100 mobiles
Page 1: ...TM8100 mobiles TM8200 mobiles Service Manual MMA 00005 05 Issue 5 November 2007...
Page 10: ...10 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 12: ...12 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 20: ...20 Introduction TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 64: ...64 Description TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 106: ...106 TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 134: ...134 General Information TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 168: ...168 Servicing Procedures TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
Page 464: ...464 Spare Parts TM8100 TM8200 Service Manual Tait Electronics Limited November 2007...
