Results
By measuring with an oscilloscope at RXIP or RXQP on a working GSM850 receiver this picture should be seen.
Signal amplitude 114mVp-p. DC offset 1.0V.
Figure 58 850 RX I/Q signal waveform
General instructions for GSM1900 RX troubleshooting
Steps
1. Connect the phone to a PC with the module repair jig.
2. Start Phoenix and establish a connection to the phone with the data cable e.g. FBUS.
3. Select File and Scan product.
4. Wait a while for the PC to read the information from the phone.
5. Select Testing and RF Controls.
6. Set the parameters as follows:
i Active Unit: RX
ii Band: GSM 1900
iii Operation Mode: Continuous mode
iv RX/TX Channel 661
v AGC: 8: FEG_ON + DTOS_ON+BB_6=Vgain_36
Results
The setup should now look like this:
RM-258; RM-259
RF Troubleshooting Instructions
Issue 1 COMPANY CONFIDENTIAL Page 4 –31
Copyright © 2007 Nokia. All rights reserved.
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