Receiver Troubleshooting; Introduction To Receiver (Rx) Troubleshooting; Gsm Rx Chain Activation For Manual Measurements/Gsm Rssi Measurement - Nokia 6500 SLIDE RM-240 Service Manual

Receiver troubleshooting

Introduction to receiver (RX) troubleshooting

RX can be tested by making a phone call or in local mode. For the local mode testing, use Phoenix service
software.
The main RX troubleshooting measurement is RSSI reading. This test measures the signal strength of the
received signal. For GSM RSSI measurements, see
RSSI measurement . For a similar test in WCDMA mode, see WCDMA RSSI measurement .

GSM RX chain activation for manual measurements/GSM RSSI measurement

Prerequisites
Make the following settings in Phoenix service software and in the signal generator:
Setting
Phoenix Channel
Signal generator
to antenna
connector
Steps
1. Set the phone to local mode.
2. Activate RSSI reading in Phoenix (Testing→GSM→RSSI reading )
Results
Measuring mode set to Sum vector , the reading should reflect the level of the signal generator (-
With the
losses) +/- 5 dB.
When varying the level in the range -30 to -102 dBm the reading should then follow within +/-5 dB.
Now select the measuring mode to
the signal generator level.
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GSM850
190
881.66771 MHz
(67.71kHz offset)
at -60dBm
Q branch and I Branch . In each case the reading should be 3 dB below
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GSM RX chain activation for manual measurements/GSM
GSM900
37
942.46771 MHz
(67.71kHz offset)
at -60dBm
GSM1800
700
1842.86771 MHz
(67.71kHz offset)
at -60dBm
RM-240
RF troubleshooting
GSM1900
661
1960.046771 MHz
(67.71kHz offset)
at -60dBm
Issue 1