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Nokia RM-4, Troubleshooting Instructions

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Nokia RM-4 Troubleshooting Instructions Download Page 28

 RM-4/RM-5

CCS Technical Documentation

Troubleshooting Instructions

28

COMPANY CONFIDENTIAL

ISSUE 1 02/2004

Copyright © 2003 Nokia. All Rights Reserved.

By measuring with an oscilloscope at RXIP or RXQP on a working GSM 900 receiver this pic-
ture should be seen.

Signal amplitude peak-peak 789 mV

DC offset 1.2 V

Figure 8: RX900 I/Q signal waveform

Summary of Contents for RM-4

Page 1: ...ISSUE 1 02 2004 COMPANY CONFIDENTIAL 1 Copyright 2003 Nokia All Rights Reserved Customer Care Solutions Technical Documentation Troubleshooting Instructions ...

Page 2: ...RM 4 RM 5 CCS Technical Documentation Troubleshooting Instructions 2 COMPANY CONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved This page left intentionally blank ...

Page 3: ...dsfree speaker does not work 19 Charging faults 20 General RF Troubleshooting 23 RF Key component placement 24 General Instructions for GSM900 RX Troubleshooting 26 Troubleshooting Chart for GSM900 Receiver 27 General Instructions for GSM1800 RX Troubleshooting 29 Troubleshooting Chart for GSM1800Receiver 30 Measurement points in the receiver 31 RM 4 RM 5 Transmitter troubleshooting 33 Measurement...

Page 4: ...IDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved TX power tuning GSM 45 TX power tuning PCN 48 I Q tuning 50 RF control 52 Call testing 53 General instructions for RM 4 5 FM radio Troubleshooting 54 Location of testpoints 54 Phoenix control 54 Fault finding guide 56 ...

Page 5: ...on ISSUE 1 02 2004 COMPANY CONFIDENTIAL 5 Copyright 2003 Nokia All Rights Reserved Baseband troubleshooting Baseband testpads Component side PWB backside Figure 1 Component side PWB backside Display connector PWB front side Figure 2 Display connector PWB front side ...

Page 6: ...mentation Troubleshooting Instructions 6 COMPANY CONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved Close up of testpads Production test pads for programming FLASH and service functions J396 RFBUS RF I Q signals ...

Page 7: ...RM 4 RM 5 Troubleshooting Instructions CCS Technical Documentation ISSUE 1 02 2004 COMPANY CONFIDENTIAL 7 Copyright 2003 Nokia All Rights Reserved FLASH CBUS DBUS FBUS MBUS SLEEPX PURX AUDIO SHUTDOWN ...

Page 8: ... VBAT 3 6VDC No Yes Check L260 L261 L262 L263 L264 L265 C260 C261 C262 C263 C264 C265 Check X105 Yes No J402 PURX 1 8VDC 1 sec after power key is pressed L260 L261 L262 L263 L264 L265 C260 C261 C262 C263 C264 C265 Voltage 3 6VDC R426 26 MHz clock min 300mVACpp probe Cin 10 13 pF 10M C227 VR3 2 78VDC J404 Sleep clock is 32 768 kHz 1 8Vpp Check C227 PWB Else defective D200 Check PWB Else defective D...

Page 9: ...o not work Error from prommer Phone doesn t set FBUS_TX line low Yes Check PWB Else defective D200 J409 J410 J411 J412 Voltage level at 1 8VDC Check R108 PWB Yes No No J396 R108 Check connection between pad 1 2 3 on J396 and R108 Try reading MCU ID with Phoenix Reading OK Try reading Flash ID with Phoenix Reading OK Check Replace D450 Check PWB Else defictive D400 Yes Yes No No Yes Reflash phone ...

Page 10: ...run out after approximately 32 seconds and should initiate a reset Power doesn t stay on or phone is jammed J404 Sleep clock 32 768 kHz 1 8Vpp Yes Check D450 Keymat Lightguide PWB Else defective D400 UI functionality and keys react to pressure Check PWB Else defective D200 Yes No No J402 PURX 1 8VDC 1 sec after power key is pressed Check C420 C426 R420 R426 N600 Mjoelner Yes No Yes Reflash phone C...

Page 11: ...al order Use common sense and experience to decide which test case to start error hunting at Display shows Contact Service EarDa MicDa between UPP and UEM Check PWB Else defective D200 or D400 MBUS interface between UPP and UEM AuxDa UEMInt between UPP and UEM Yes No SleepX SleepClk between UPP UEM Key is stucked TXI QD RXI QD SIM interface between UPP UEM Flash checksum y ASIC version vs compilat...

Page 12: ...ll during GSM frame call mode Use TXP on C646 as trigger Check C222 C223 C224 C225 C226 C227 PWB Else defective D200 or D400 J421 J422 J423 Check RF serial bus during GSM frame Logic HIGH 1 8VDC Logic LOW 0VDC RFBUSCLK J421 RFBUSDA J422 RFBUSEN1X J423 C222 C223 C224 C225 C226 C227 Voltage 2 78VDC All during GSM frame call mode Use TXP on C646 as trigger No Yes Check PWB Else defective D200 or D400...

Page 13: ...irst check for a 1 8V SIM card and then a 3V SIM card The phone will try this four times whereafter it will display Insert SIM card Check for SIM voltage during power up Ch1 VSIM Ch2 RESET Ch3 CLOCK Ch4 DATA Display shows Insert SIM Card Check X387 R386 PWB Else defective D200 Message can also appear if BSI signal from battery is not present or only working intermittently Please check BSI X387 Ver...

Page 14: ...For reference a picture with normal SIM power up is shown below Normal SIM power up sequence Ch1 VSIM Ch2 RESET Ch3 CLOCK Ch4 DATA Display shows SIM Card Rejected Check R386 PWB Else defective D200 X387 VSIM min 1 6V 1 8V Card VSIM min 2 8V 3V Card See illustration below Yes No Yes SIM Interface OK X387 ATR data can be seen at SIM data pin Check X387 R386 PWB No Yes ...

Page 15: ...ts Reserved Audio related faults Earpiece Speaker mounted in display assy IHF Integrated handsfree Speaker mounted in back cover D cover No sound in earpiece Earpiece do not work Replace Z150 R161 No Defective D200 or PWB error Z150 R161 Check Z150 R161 is working correctly no short open circuit Replace Earpiece Yes Error still present ...

Page 16: ...ot a mechanical problem Check R165 C168 PWB Else defctive D200 No Error still present R165 Check voltage level on R165 towards UEM bias 2 1V Replace Z100 Yes Z100 Check Z100 is working correctly no short open circuit No R153 Check voltage level on R153 towards mic lines bias 1 0V 1 4V Check R152 R153 R155 R157 R164 C151 C152 C153 C154 PWB No C101 C102 C103 Check for short circuit No Replace C101 C...

Page 17: ...roblem Replace R166 and or Z101 Defective D200 R166 Check voltage level on R166 towards UEM bias 2 1V No R154 R156 R160 R162 R168 C172 C170 C173 C174 Z101 Check XMIC line to UEM D200 Check R166 R151 C171 R151 Check voltage level on R151 towards UEM bias 1 0V 1 4V No Yes Yes Error still present Replace Defective component No Headset earpiece do not work Replace R183 and or Z102 C123 C124 Defective ...

Page 18: ...ndsfree speaker do not work Change IHF speaker working reference IHF OK Is there a malfunction or dirt in the switch Insert headset working reference Sound in IHF Check IHF pads on PWB and spring contacts on IHF speaker Clean PWB and IHF speaker contact springs Risk of decreased phone performance if PWB pads are corroded or badly scratched Reliable repair might be impossible Dirty dusty scratched ...

Page 19: ... possible PWB or N180 solder error Check Short circuit of N180 PWB error or D400 make sure IHF is activated in software Check Replace C184 C185 C189 C190 change N180 Check Replace L180 L181 C 189 C190 START input ok Check input on N180 R181 R159 Fig 1 Check VBAT on C182 voltage above 3 2 VDC Check TP J150 Boomer is activated if signal is high Signal high 1 8 VDC Check output on N180 at C184 C185 F...

Page 20: ...AR 2 1VDC No Defective D200 Yes Display info when charger is connected Not charging Check X105 R202 R206 C240 R206 Voltage on R206 towards D200 is 0 8VDC when power is connected BSI must be 75K No Check PWB Yes R207 Voltage use scope on R207 towards D200 is 0 9VDC at peak BSI must be 47K Check X105 R202 R207 C220 No R200 Voltage on R200 towards D200 same as VBAT voltage Check R200 PWB Else defecti...

Page 21: ...ISSUE 1 02 2004 COMPANY CONFIDENTIAL 21 Copyright 2003 Nokia All Rights Reserved Phone is ON or OFF battery nominal voltage 3 7VDC and no current from charger when connected Check F100 L100 V100 C100 R200 System connector L100 VCHAR 3 7VDC No Defective D200 or D400 Yes ...

Page 22: ...RM 4 RM 5 CCS Technical Documentation Troubleshooting Instructions 22 COMPANY CONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved This page left intentionally blank ...

Page 23: ...scope The probe used in the following is 10 Mohm 8pF passive probe If using another probe then bear in mind that the voltages displayed may be slightly different Always make sure the measurement set up is calibrated when measuring RF parameters on the antenna pad Remember to include the loss in the module repair jig when realigning the phone Most RF semiconductors are static discharge sensitive So...

Page 24: ...UE 1 02 2004 Copyright 2003 Nokia All Rights Reserved RF Key component placement Figure 3 RF key components Table 1 RF component placement N600 Mjoelner RF IC Z601 PCN RX SAW Z602 EGSM RX SAW Z603 EGSM TX SAW B600 26 MHz crystal G600 VCO 4 0 GHz UHF VCO N700 Power Amplifier PA Z700 RX TX switch ...

Page 25: ... Technical Documentation ISSUE 1 02 2004 COMPANY CONFIDENTIAL 25 Copyright 2003 Nokia All Rights Reserved Refer to the picture below for measuring points at the UEM D200 Figure 4 Supply points at UEM D200 Figure 5 Supply point at Mjoelner N600 ...

Page 26: ...Rights Reserved General Instructions for GSM900 RX Troubleshooting Connect the phone to a PC with the module repair jig Start Phoenix and establish connection to the phone Phoenix commands RF Controls Band GSM 900 RX Continuous mode Channel 37 AGC 8 FEG ON 46 dB The setup should now look like this Figure 6 GSM900 RF Controls window ...

Page 27: ...ntenna conn Oscilloscope at RX i Q signal 588mVpp DC offset 1 35V Freq 67 71kHz YES YES NO NO YES YES EGSM Check RX TX Oscilloscope Check Mjoelner Check chain OK switch at RX900 Z700 56dBm check VC1 and VC2 at Z700 Signal 0V RX TX switch Spectrum analyzer Spectrum analyzer Oscilloscope Check Check EGSM SAW filter Z602 output 65dBm NO YES NO YES NO YES SAW filter Z602 Inductor L603 L602 check signa...

Page 28: ...COMPANY CONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved By measuring with an oscilloscope at RXIP or RXQP on a working GSM 900 receiver this pic ture should be seen Signal amplitude peak peak 789 mV DC offset 1 2 V Figure 8 RX900 I Q signal waveform ...

Page 29: ...ights Reserved General Instructions for GSM1800 RX Troubleshooting Connect the phone to a PC with the module repair jig Start Phoenix and establish connection to the phone Phoenix commands RF Controls Band GSM 1800 RX Continuous mode Channel 700 AGC 8 FEG ON 46 dB The setup should now look like this Figure 9 GSM1800 RF control window ...

Page 30: ... antenna conn Oscilloscope at RX i Q signal 588mVpp DC offset 1 35V Freq 67 71kHz YES YES NO NO YES YES EGSM Check RX TX Oscilloscope Check Mjoelner Check chain OK switch at RX1800 Z700 56dBm check VC1 and VC2 at Z700 Signal 0V RX TX switch Spectrum analyzer Spectrum analyzer Oscilloscope Check Check EGSM SAW filter Z601 output 65dBm NO YES NO YES NO YES SAW filter Z602 Inductor L603 L602 check si...

Page 31: ...NTIAL 31 Copyright 2003 Nokia All Rights Reserved XIP or RXQP on a working GSM 1800 receiver this picture should be seen Signal amplitude peak peak 460 mV DC offset 1 2 V Figure 11 RX1800 I Q signal waveform Measurement points in the receiver Figure 12 RX measurements point at the RX TX Switch Z700 ...

Page 32: ...ntation Troubleshooting Instructions 32 COMPANY CONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved Figure 13 Measurements points at the RX Filters Z601 Z602 Figure 14 RX I Q Signals Baseband shielding can UEM D200 ...

Page 33: ...1 02 2004 COMPANY CONFIDENTIAL 33 Copyright 2003 Nokia All Rights Reserved RM 4 RM 5 Transmitter troubleshooting Measurement points for the transmitter Figure 15 TX measurement points in the PA N700 shielding can Figure 16 TX measurement points in Mjolner N600 shielding can ...

Page 34: ... should be connected to measurement equipment or to at least a 10 dB attenuator otherwise the PA may be damaged Start Phoenix Service Software and establish a connection to the phone e g FBUS Select File and Product Select Maintenance Testing and RF Controls Band GSM 900 Active Unit TX Tx Power Level 19 Tx Data Type All 1 Your screen should look like Figure 17 GSM900 RF controls window Measure the...

Page 35: ...RM 4 RM 5 Troubleshooting Instructions CCS Technical Documentation ISSUE 1 02 2004 COMPANY CONFIDENTIAL 35 Copyright 2003 Nokia All Rights Reserved Figure 18 VPCTRL_G and TXC signal ...

Page 36: ...nal act as normal RF cable should be connected to measurement equipment or to at least a 10 dB attenuator otherwise the PA may be damaged Start Phoenix Service Software and establish a connection to the phone e g FBUS Phoenix commands RF Controls Band GSM 1800 RX Continuous mode Channel 700 AGC 14 FEG ON 24 dB Your screen should look like Figure 19 RF controls window Measure the output power of th...

Page 37: ...uency for the PLL synthesizer and as the system clock for BaseBand The 26MHz signal is divided by 2 to achieve 13MHz inside the UPP IC D400 The 26 MHz signal from the VCXO can be measured by probing R425 must be measured on the UPP side of R425 i e the end not connected to C425 The level at this point is approx 700mVpp Frequency of this oscillator is adjusted by changing the AFC register inside th...

Page 38: ...Technical Documentation Troubleshooting Instructions 38 COMPANY CONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved Troubleshooting diagram for PLL Synthesizer Figure 21 PLL Troubleshooting diagram ...

Page 39: ... be that the 26MHz system clock signal is not getting to the UPP clock input in BaseBand In this case check the following 1 Turn on the phone and check 2 VCXO Power supply C620 2 7V 3 VCXO output R420 end not connected to C425 is 26MHz and approx 700mVpp If this is not the case check the reference crystal B600 and Mjolner N600 as well as R420 R426 C420 C426 Measurement points at the VCXO Figure 22...

Page 40: ...5 CCS Technical Documentation Troubleshooting Instructions 40 COMPANY CONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved Measurement points at the PLL VCO Figure 22 Measurement point for PLL ...

Page 41: ...GSM900 and 700 for GSM1800 The alignments and calibrations must be performed in the or der shown to give reliable results The way to save data to the phone and to load data from the phone is made different in the various tunings Always look what is shown in the windows regarding these issues and act ac cordingly To vary a selected parameter you can use and key or in some cases directly type the ne...

Page 42: ...data in the phone is shown 2 Calibrate and the new data is shown 3 Stop and the little window pops up where you can select to save or not 4 Select GSM1800 in the top bar and repeat at channel 700 Figure 24 GSM1800 RX calibration window 1 The existing data in the phone is shown 2 Calibrate and the new data is shown 3 Stop and the little window pops up where you can select to save or not ...

Page 43: ...Reserved RX channel select filter 1 Select Maintenance Tuning Rx Channel Select Filter Calibration 2 Press Start and you can select to load values from the phone or not 3 Press AutoTune 4 Press Stop and you can select to save values to the phone or not to Figure 25 RX channel selection window Note This calibration requires no input signal ...

Page 44: ...t to load values from the phone or not 3 Press Manual Tuning 4 Set the Signal generator according to the pop up windows 5 When finished press Stop Write to PM area and you can select to save values to the phone or not 6 Repeat for GSM1800 Figure 26 RX Band filter response window Note This calibration requires a lot of different frequencies from the generator If you have a signal generator with a f...

Page 45: ...a All Rights Reserved Tx Power tuning Select Maintenance Tuning Tx Power Level Tuning TX power tuning GSM 1 Select edge off GSM 900 Figure 27 TX power tuning window1 2 Press Start and select from where to load values It is best to have PC saved data from a good phone The data from a good phone can be saved to PC for use later ...

Page 46: ... power level tuning window 2 1 Select the modulation 1 0 or random in Tx Data Type Select random if a GSM tester is used Then it can synchronise to the burst 2 Select Tx PA Mode High 3 Tune the highlighted values to the wanted power Use average burst power 4 Tune base level to 28dBm Close to lowest level CMD55 can keep synchronisa tion 5 Calculate coefficients ...

Page 47: ... values 2 The base level coefficient is taken from the high mode Do not change it 3 Calculate and select Stop Figure 30 Stop TX power level tuning dialogue If you are satisfied with the coefficients and the power then save to the Permanent memory You can also save the table to the PC so that you can load it to an other phone Or you can select not to do anything by removing both ticks Only way to e...

Page 48: ...ONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved TX power tuning PCN Figure 31 PCN GSM1800 TX power tuning window Figure 32 Start TX power level tuning dialogue 1 Select GSM 1800 band PCN 2 Start 3 Select where to get values from Normally Permanent Memory 4 OK ...

Page 49: ... tuning window 1 Select the wanted modulation Random if a GSM tester is used so that you can synchronise the burst 2 Only high mode is possible 3 Tune the highlighted values to the wanted power 4 Tune base level to 27dBm 5 Stop Figure 34 Stop TX power level tuning dialogue 6 Select where to save the values one both or no one can be selected 7 Yes That s the only way to end tuning ...

Page 50: ...ct Maintenance Tuning Tx IQ tuning Set CMD55 to Narrow Spectrum on the same band as the phone Selected in the top menu Figure 35 I Q tuning window 1 Select where to get values Normally select Load From Product 2 Start 3 Tune offset values to lowest carrier Use Side arrows or 4 Tune Amplitude and phase to lowest sideband 5 Check eventually with other modulation 0 ...

Page 51: ...2003 Nokia All Rights Reserved Figure 36 TX I O tuning window Note Remember to tick Save to Product if you want to save the values in the phone 1 Stop to end the tuning with the selected save option 2 Same procedure for PCN as for GSM 3 Remember to tick Save To Product 4 Stop Ends tuning and does what you have ticked ...

Page 52: ...e receiver or transmitter without going in call It works very much like a call but you have control via the PC and not via the tester The TX mode GSM900 can select between Free High and low mode It changes the PA mode but changes also the power level if a level is selected that is not supported in that mode If you want to tune at other channels than the default then you must select it first in RF ...

Page 53: ...orking a call is the ultimate test of the phone Set CMD55 or similar tester to manual test and switch the phone to normal if it was in local Remember to have a test sim card in the phone When the phone has made a registration a call can be made and it is possible to let the phone answer via Phoenix In the Autocaller Maintenance Testing you can answer by ticking Answer when button pushed and then p...

Page 54: ...hts Reserved General instructions for RM 4 5 FM radio Troubleshooting Location of testpoints Phoenix control Connect the phone to a PC with the module repair jig Start Phoenix and establish connection with the phone Select FM Radio Control in the Testing menu The setup should look like this C372 R362 R362 N360 R385 C367 R360 R385 C360 ...

Page 55: ...MPANY CONFIDENTIAL 55 Copyright 2003 Nokia All Rights Reserved Turn on the FM radio through the key marked Power and select Tuning The setup should look like this It is now possible to tune the radio for the wanted frequency The troubleshooting guide requires that the radio is turned on ...

Page 56: ...7 5 MHz Yes No Replace D200 No Yes Check R363 Replace N360 No Fail OK Yes No Check R362 Replace D400 No Yes Yes Replace N360 OK Voltmeter at C367 2 6 Vdc 2 9 Radio does not work Voltmeter at C372 2 7 Vdc 2 9 Voltmeter at R360 Vflash2 2 7 Vdc 2 86 Osciloscope at R362 N360 13 MHz signal amplitude 1 3Vpp Check R360 Replace R360 Fail Osciloscope at R362 13 MHz signal amplitude 1 8Vpp A ...

Page 57: ...lace N360 OK Apply signal from generator 88 MHz 50 kHz deviation level 60 dBm at C360 Set radio for 107 MHz Apply signal from generator 107 MHz 50 kHz deviation level 60 dBm at C360 Yes Check C360 C361 R371 L360 L361 No Replace N360 OK Check C360 C361 R371 L360 L361 Replace N360 Fail OK Radio OK OK Voltmeter at C373 0 7 Vdc 1 2 A Voltmeter at C373 1 6 Vdc 2 2 Measure audio level at R385 480mVpp Va...

Page 58: ...RM 4 RM 5 CCS Technical Documentation Troubleshooting Instructions 58 COMPANY CONFIDENTIAL ISSUE 1 02 2004 Copyright 2003 Nokia All Rights Reserved This page left intentionally blank ...

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