Receiver Troubleshooting; Introduction To Receiver (Rx) Troubleshooting; Gsm Rx Chain Activation For Manual Measurements/Gsm Rssi Measurement - Nokia RM-645 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 section
GSM RSSI measurement (page 4–10 )
measurement (page 4–13 )

GSM RX chain activation for manual measurements/GSM RSSI measurement

Prerequisites
Make the following settings in signal generator and Phoenix service software:
Setting
Phoenix Channel
Signal generator
to antenna
connector
Steps
1. Set the phone to local mode.
2. Activate RSSI reading in Phoenix by selecting Testing → GSM → RSSI reading .
Results
The reading should reflect the level of the signal generator (minus losses) ±5dB.
When varying the level in the range -30 to -102dBm the reading should then follow within ±5dB.
Page 4 – 10
. For a similar test in WCDMA mode, see section
.
GSM850
190
881.66771MHz
(67.71kHz offset)
at -60dBm
Figure 25 Phoenix RSSI Reading window
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GSM RX chain activation for manual measurements/
GSM900
37
942.46771MHz
(67.71kHz offset)
at -60dBm
WCDMA RSSI
GSM1800
700
1842.86771MHz
(67.71kHz offset)
at -60dBm
RM-645
RF Troubleshooting
GSM1900
661
1960.06771MHz
(67.71kHz offset)
at -60dBm
Issue 1