Tait TM8115 Service Manual

252 Receiver Fault Finding TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
Task 1 1 —
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 Table 10.2.
2. If the settings are correct, go to Tas k 12
. If they are not, go to Step 3.
3. Recalibrate the receiver and check the settings again.
4. If the settings are now correct, go to Step 5. If they are not, go to
Tas k 1
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 “Final
Tasks” on page 157. If it has not, go to Tas k 1 2
.
Task 1 2 —
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 Tas k 13
. If they are not, go to
Step 3.
3. Recalibrate the receiver and check the values again.
4. If the values are now correct, go to Step 5. If they are not, go to
Tas k 1
and check the receiver sensitivity.
5. Check if the RSSI fault has been removed. If it has, go to “Final
Tasks” on page 157. If it has not, go to Tas k 1 3
.
Task 1 3 —
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 Step 6. If they are not, go to
Step 3.
3. Recalibrate the receiver and check the values again.
4. If the values are now correct, go to Step 5. If they are not, go to
Tas k 1
and check the receiver sensitivity.
5. Check if the RSSI fault has been removed. If it has, go to “Final
Tasks” on page 157. If it has not, go to Step 6.
6. In this case all the RSSI calibration settings are correct, but there is
still an RSSI fault. Go to Tas k 1
and check the receiver sensitivity.

Tait TM8115 Specifications

General

Brand	Tait
Model	TM8115
Category	Radio
Language	English