Nokia RM-42 Service Manual

Also see for RM-42: Service manual

Contents

Nokia Customer Care Appendix A: RF TroubleshootingA-114Company ConfidentialCopyright © 2005 Nokia. All rights reserved6.1 WCDMA receiver Bit Error Rate (BER) ok?• This test needs a WCDMA communication tester and if there is no that kind of tester availablecontinue troubleshooting in section 4.2 “Does the phone give realistic RSSI-values?”.• Attach the phone to the product specific test jig and a WCDMA communication tester to theRF-coupler. Coupler attenuation should be also taken into account during measurements. Thismeasurement should be done in an RF shielded box.• Close the shield box hatch.• Make a WCDMA call against the tester• Settings to the tester have to be done according to the 3GPP specifications:- Set base station output level (Îor) to -106.7 dBm / 3.84 MHz- Set DPCH_Ec level to -117 dBm / 3.84 MHz• Bit Error Rate should be less than 0.1 %6.1.1 Does the phone give realistic RSSI-values?• See section 4.2 “Does the phone give realistic RSSI-values?”6.1.2 Hinku (N7500) or RAP3G (D2800) faulty?• RAP3G is not possible to replace6.2 WCDMA TX power and transmit frequency ok?• See section 4.1. “WCDMA TX power and transmit frequency ok?”6.3 WCDMA Transmitter error vector magnitude ok?• This test needs a WCDMA communication tester and if there is no that kind of tester availablecontinue troubleshooting in section 4.3 “WCDMA modulation spectrum and ACLR ok?”• Attach the phone to the product specific test jig and the WCDMA communication tester to theRF-coupler. Coupler attenuation should be also taken into account during measurements. Thismeasurement should be done in an RF shielded box.• Close the shield box hatch.• Make a WCDMA call against the tester• The Error Vector Magnitude shall not exceed 17.5 % with power levels ≥ –20 dBm.• If Error Vector Magnitude is not as expected separate the phone into parts and place to themodule jig (Notice that there are three antenna connectors in the module jig, one for GSM, one forWCDMA and one for Bluetooth. Make sure that all connections are made to the correct RF-connector).