204
Diagnosis of Faults on Main Board
TM8100 Mobile Radio
Service Manual
May 2004 © Tait Electronics Limited
Task 5 —
Incorrect RSSI Readings
If the RSSI readings are incorrect, use the calibration application to
check the receiver calibration as follows:
1.
Open the
“Raw Data”
page and click the
“Receiver”
tab. Note the
settings listed in the
“AGC Voltage Cal Pts”
field. The nominal
settings should be as listed in
. If the settings are correct,
go to Step 3. If they are not, recalibrate the receiver and check the
settings again. If they are now correct, go to Step 2. If they are
not, go to Task 1 and check the receiver sensitivity.
2.
Check if the RSSI fault has been removed. If it has, return to
. If it has not, go to Step 3.
3.
Note the settings listed in the
“FE Tune BPF Settings”
field. The
nominal settings should be as listed in
. If the settings are
correct, go to Step 5. If they are not, recalibrate the receiver and
check the settings again. If they are now correct, go to Step 4. If
they are not, go to Task 1 and check the receiver sensitivity.
4.
Check if the RSSI fault has been removed. If it has, return to
. If it has not, go to Step 5.
5.
Note the values listed in the
“RSSI Delta Gain Values”
field. The
values should run gradually from 0 dB to about –3 dB. If they do,
go to Step 7. If they do not, recalibrate the receiver and check the
values again. If they are now correct, go to Step 6. If they are not,
go to Task 1 and check the receiver sensitivity.
6.
Check if the RSSI fault has been removed. If it has, return to
. If it has not, go to Step 7.
7.
Note the values listed in the
“AGC Delta Gain Values”
field. The
values should be between 0 dB and about 35 dB. If they are, go
to Step 9. If they are not, recalibrate the receiver and check the
values again. If they are now correct, go to Step 8. If they are not,
go to Task 1 and check the receiver sensitivity.
8.
Check if the RSSI fault has been removed. If it has, return to
. If it has not, go to Step 9.
9.
In this case all the RSSI calibration settings are correct, but there
is still an RSSI fault; go to Task 1 and check the receiver sensitivity.
Summary of Contents for TM8000 Series
Page 32: ...32 Introduction TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Page 78: ...78 Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Page 106: ...106 General Information TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Page 124: ...124 Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
