252
Receiver Fault Finding
TM8100/TM8200 Service Manual
© Tait Electronics Limited
June 2006
Task 11 —
FE Tune BPF Settings
If the AGC voltage calibration is correct, check the FE tune BPF settings.
1.
Note the settings listed in the
“FE Tune BPF Settings”
field.
The nominal settings should be as listed in
2.
If the settings are correct, go to
. If they are not, go to
3.
Recalibrate the receiver and check the settings again.
4.
If the settings are now correct, go to
. If they are not, go to
of
“Faulty Receiver Sensitivity” on page 240
and check the
receiver sensitivity.
5.
Check if the RSSI fault has been removed. If it has, go to
. If it has not, go to
Task 12 —
RSSI Delta Gain
If the FE tune BPF settings are also correct, check the RSSI delta gain
values.
1.
Note the values listed in the
“Rx Delta Gain Values”
field. The values
should be between 0dBm and about –3dBm.
2.
If the values are as expected, go to
. If they are not, go to
3.
Recalibrate the receiver and check the values again.
4.
If the values are now correct, go to
. If they are not, go to
and check the receiver sensitivity.
5.
Check if the RSSI fault has been removed. If it has, go to
. If it has not, go to
Task 13 —
AGC Delta Gain
If the RSSI delta gain values are also correct, check the AGC delta gain
values.
1.
Note the values listed in the
“AGC Delta Gain Values”
field. The values
should run gradually from 0dBm to about 35dBm.
2.
If the values are as expected, go to
. If they are not, go to
3.
Recalibrate the receiver and check the values again.
4.
If the values are now correct, go to
. If they are not, go to
and check the receiver sensitivity.
5.
Check if the RSSI fault has been removed. If it has, go to
. If it has not, go to
6.
In this case all the RSSI calibration settings are correct, but there is
still an RSSI fault. Go to
and check the receiver sensitivity.
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...
