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Nokia Mobile Phones NHX-4N, Инструкции по устранению неисправностей

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PAMS Technical Documentation

Original 01/98

Copyright 

 1998 Nokia Mobile Phones.  All rights reserved.

NHX–4N

DISASSEMBLY &

TROUBLESHOOTING

INSTRUCTIONS

Содержание NHX-4N

Страница 1: ...PAMS Technical Documentation Original 01 98 Copyright 1998 Nokia Mobile Phones All rights reserved NHX 4N DISASSEMBLY TROUBLESHOOTING INSTRUCTIONS...

Страница 2: ...PAMS Technical Documentation NHX 4N Disassembly Troubleshooting Instructions Page 2 Original 01 98 AMENDMENT RECORD SHEET Amendment Number Date Inserted By Comments...

Страница 3: ...age 3 Original 01 98 CONTENTS Page No Disassembly instructions Page 4 General Trobleshooting Page 6 General Troubleshooting Page 7 Logic fault Page 8 Receiver fault Page 9 Transmitter fault Page 10 Au...

Страница 4: ...nal 01 98 Disassembly instructions 2 Remove screw covers 3 pcs with screwdriver 1 Remove the antenna 3 Remove back cover screws 3 pcs 4 Remove back cover 5 Disconnect battery connector 1 microphone co...

Страница 5: ...hooting Instructions Page 5 Original 01 98 8 Remove transceiver module 9 Turn around Loosen the light guide carefully from both sides of the PCB with flat headed tool 10 Lift display carefullly Remove...

Страница 6: ...r it is can be found as simply as possible The flow charts give you the overview of the blocks The purpose is that you proceed through the flow diagram so that if your answer is YES for the asked ques...

Страница 7: ...NAD OK Transmitter fault Transmitter operating RF power OK Earphone level modulation Earphone level or modulation fault END Display or keypad fault Is display keypad module working Call set up fault C...

Страница 8: ...2 M2BUS 3 3 V Above lines are to show Check d c voltages of N101 pin 17 1 75 V if VBAT 4 8 V pin 1 5 22 VBAT Voltages always 3 3 V Check solderings of MUUMI N101 loading of supply voltages if OK chan...

Страница 9: ...llector FAIL OK OK RX VCO oscillating 1 IF at N370 16 OK FAIL OK Check operation of V380 FAIL Check solderings of Z660 Z321 Z350 operation of V320 FAIL IF level after Z350 OK Check voltage of N370 4 c...

Страница 10: ...IL TX VCO freq and spectrum FAIL OK level High at C642 OK TXE OFF Buffer V430 output freq and spectrum OK TXE OFF OK OK Check resistance through N820 17 R421 R422 R423 Connections of R430 C432 VCTCXO...

Страница 11: ...46 PIN 47 PIN 49 PIN 50 PIN 51 PIN 55 MOD FILO EXPI EAMPBO EXPO VOLI PIN 28 PIN 29 PIN 30 PIN 32 PIN 34 XEAR EAR EVGND EARP EARM EARM PIN 38 PIN 37 50 mVrms 50 mVrms 50 mVrms 70 mVrms 70 mVrms 170 mV...

Страница 12: ...f switches V43 and V45 Pulses to 3 3V on COL0 4 lines at 50 ms intervals Check COL0 4 lines from keyboard to D201 ROW0 2 lines are to carry 3 3V and pulses to 0 V at 50 ms intervals when corresponding...

Страница 13: ...SERV mode Subscriber data OK RSSI operative Data detection of N701 operative Replace N701 Check subscriber data and country codes and Check RSSI tunings and tune if needed Inspect the signal path from...

Страница 14: ...PAMS Technical Documentation NHX 4N Disassembly Troubleshooting Instructions Page 14 Original 01 98 This page intentionally left blank...

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