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If the phone is dead and you cannot perform the self tests, go to
Dead or jammed device troubleshooting
in
Chapter 3, BB Troubleshooting and Manual Tuning Guide.
Note:
Self tests are recommended to be made when phone is in jig and a 50Ω load connected to
the RF connector. Otherwise power tests may fail depending on antenna load.
Troubleshooting flow
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 RX chain activation for manual measurements/
GSM RSSI measurement (page 4–7 )
. For a similar test in WCDMA mode, see section
GSM RX chain activation for manual measurements/GSM RSSI measurement
Prerequisites
Make the following settings in signal generator and Phoenix service software:
Setting
GSM850
GSM900
GSM1800
GSM1900
Phoenix Channel
190
37
700
661
Signal generator
to antenna
connector
881.46771MHz
(67.71kHz offset)
at -60dBm
942.46771MHz
(67.71kHz offset)
at -60dBm
1842.86771MHz
(67.71kHz offset)
at -60dBm
1960.06771MHz
(67.71kHz offset)
at -60dBm
RM-721; RM-722
RF Troubleshooting
Issue 1
COMPANY CONFIDENTIAL
Page 4 – 7
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