User Guide

ISSUE 1 09/2004 COMPANY CONFIDENTIAL 3
Copyright © 2004 Nokia. All Rights Reserved.
RH-53/54
Nokia Customer Care
Table Of Contents
Page No
Baseband Troubleshooting................................................................................ 7
Baseband test points ......................................................................................... 7
Troubleshooting diagrams ................................................................................. 8
Phone is dead.................................................................................................... 9
Flash programming does not work................................................................... 10
Power does not stay on or phone is jammed................................................... 11
Display information : "Contact Service"............................................................ 12
The phone does not register to the network, or the phone cannot make a call 13
Charging troubleshooting................................................................................. 14
Audio troubleshooting 1, 2 ............................................................................... 16
Audio troubleshooting 3: Headset does not work ............................................ 17
Upper block failures.......................................................................................... 18
Introduction to RH-53/54 RF Troubleshooting ............................................... 23
General description of the RF circuits............................................................ 24
Receiver signal path ........................................................................................ 24
Transmitter signal path .................................................................................... 24
PLL................................................................................................................... 25
RF Key component placement......................................................................... 28
Troubleshooting................................................................................................ 29
Common circuit................................................................................................ 29
Power Supply Configuration .......................................................................... 29
General instructions for Synthesizer troubleshooting ...................................... 31
26 MHz Reference Oscillator ( VCXO ) ........................................................... 31
Example Signal Measured at VCXO output (R420) ....................................... 32
VCO ............................................................................................................... 32
Troubleshooting chart for the Synthesizer ....................................................... 33
Measurement points for the Synthesizer ......................................................... 34
Receiver Troubleshooting............................................................................... 37
Front End Module (FEM) control signals ......................................................... 37
Renesa FEM logic .......................................................................................... 37
RFMD FEM logic ............................................................................................ 37
Measurements points....................................................................................... 38
Measurement points for the receiver ............................................................. 38
RH-54 Receiver ............................................................................................... 40
General Instructions for GSM850 RX Troubleshooting .................................. 40
General Instructions for GSM1900 RX Troubleshooting.................................. 43
RH-53 Receiver ............................................................................................... 46
General Instructions for GSM900 RX Troubleshooting .................................. 46