Nokia RM-42 Service Manual

Also see for RM-42: Service manual

Contents

Nokia Customer Care Appendix A: RF TroubleshootingA-116Company ConfidentialCopyright © 2005 Nokia. All rights reserved6.3.5.2 Replace balun T75036.3.6 VCTCXO frequency and output level correct?• Measurement can be done with an oscilloscope and a probe.• Connect the probe to C7529 (or C7582)• The frequency of the VCTCXO should be quite exactly 38.4 MHz and level about 0.5 - 0.9 Vpp.Example of the correct VCTCXO output signal is presented in figure 6.5.1 "VCTCXO Output (DC Offset1.24 V)".6.3.6.1 VXO-voltage ok? (=Vdig).• Measurement can be done with an oscilloscope and a probe• Connect the probe to C7560 (or C7526, C7513)• VXO-voltage should be about 2.5 V6.3.6.1.1 C7560, C7513, C7526 and C2214 ok?• Check that components are in place and solder joints are ok• Disconnect the power supply from the phone and use an ohmmeter to find out if the VXO-line isshort-circuited to the ground. If short-circuit is found replace C7560, C7513, C7526 and C2214. Ifreplacing does not help then go to the next steps.6.3.6.1.2 Replace Retu6.3.6.1.3 Replace Hinku (N7500) or Vinku (N7501) or VCTCXO (G7501) or all three components6.3.6.2 BB AFC-voltage ok?• See section "BB AFC-voltage ok?"6.3.6.3 Replace VCTCXO G75016.4 WCDMA modulation spectrum and ACLR ok?• See section 4.3 “WCDMA modulation spectrum and ACLR ok?”