Related Manuals for Nokia Mobile Phones NHX-4N
Summary of Contents for Nokia Mobile Phones NHX-4N
- Page 1 PAMS Technical Documentation NHX–4N DISASSEMBLY & TROUBLESHOOTING INSTRUCTIONS Copyright E 1998 Nokia Mobile Phones. All rights reserved. Original 01/98...
- Page 2 Disassembly & Troubleshooting Instructions PAMS NHX–4N Technical Documentation AMENDMENT RECORD SHEET Amendment Date Inserted By Comments Number Page 2 Original, 01/98...
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Page 3: Table Of Contents
PAMS Disassembly & Troubleshooting Instructions Technical Documentation NHX–4N CONTENTS Page No Disassembly instructions ....... Page 4 General Trobleshooting . -
Page 4: Disassembly Instructions
Disassembly & Troubleshooting Instructions PAMS NHX–4N Technical Documentation Disassembly instructions 1) Remove the antenna 5) Disconnect: battery connector (1), microphone connector (2), and earphone connector (3) with tweezers 2) Remove screw covers (3 pcs) with screwdriver 6) Remove battery 3) Remove back cover screws (3 pcs) 4) Remove back cover... - Page 5 PAMS Disassembly & Troubleshooting Instructions Technical Documentation NHX–4N 10) Lift display carefullly 8) Remove Remove screws (3 pcs) transceiver module 11) Chassis and module 9) Turn around, can now be separated Loosen the light guide carefully from both sides of the PCB with flat headed tool Original, 01/98 Page 5...
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Page 6: General Trobleshooting
Disassembly & Troubleshooting Instructions PAMS NHX–4N Technical Documentation General Trobleshooting The object of troubleshooting is to define the faulty module block, and then to locate the faulty component. The troubleshooting diagram has been planned so that the fault, whatever it is, can be found as simply as possible. The flow charts give you the overview of the blocks. -
Page 7: General Troubleshooting
PAMS Disassembly & Troubleshooting Instructions Technical Documentation NHX–4N General Troubleshooting The General troubleshooting chart shows START the most common fault areas These seven fault types can be used to define the pos- sible fault. Will turn into Logic fault local mode ? FAIL Receiver OK ? Receiver fault... -
Page 8: Logic Fault
Disassembly & Troubleshooting Instructions PAMS NHX–4N Technical Documentation Logic fault Logic fault Power drops off or does not assume local mode FAIL FAIL VL, VL2, VA and FAIL Check clock signal Voltages always 3.3 V VREF ~3.3 V or only of CLKMCU ~3.3 Vpp momentarily on Check MBUS connection... -
Page 9: Receiver Fault
PAMS Disassembly & Troubleshooting Instructions Technical Documentation NHX–4N Receiver fault Receiver fault See earphone level fault Check: V310, V311 AF signal at FAIL FAIL FAIL VCCR, VREF,VSYN Simplex sens. V313, V314, N370/9 (DAF) OK? (TX off) N101/4 FAIL Transmitter 1. IF TX spectrum Check: voltage of N370/4, fault... -
Page 10: Transmitter Fault
Disassembly & Troubleshooting Instructions PAMS NHX–4N Technical Documentation Transmitter fault Check: resistance through N820/17,R421, R422, R423 Connections of R430, C432.VCTCXO operating Transmitter fault voltage and freq. =14.85 MHz. Check SCLK,SDAT and SLE lines. FAIL TX–VCO Transmitter Check: V430 operating Buffer V430 FAIL FAIL output freq. -
Page 11: Audio Fault
PAMS Disassembly & Troubleshooting Instructions Technical Documentation NHX–4N Audio fault EARPHONE LEVEL / MODULATION LEVEL FAULT SIGNAL LEVELS OF AUDIO CIRCUiT N701 COMO COMI EMPI EMPO LPIN ATTO TXMUX+TXAAF TXATT MICTRI MICAM TXBP LIM1 PREEM LIM2 TXLP COMPR ATTO PIN 47 50 mVrms WTRFIL+WPOSFIL COMI... -
Page 12: Display Or Keyboard Fault
Disassembly & Troubleshooting Instructions PAMS NHX–4N Technical Documentation Display or keyboard fault Display or keypad fault FAIL FAIL D201/29 LIGHTS Check load in lights line Lights OK ? line at + V with (R920, R921, R922, R923, R924) lights on Check operation of switches V43 and V45 KEYBOARD... -
Page 13: Call Set-Up Fault
PAMS Disassembly & Troubleshooting Instructions Technical Documentation NHX–4N Call set–up fault Call set–up fault Phone will not assume SERV – mode FAIL Check subscriber data and country codes and Subscriber data OK ? correct them if needed. FAIL Check RSSI tunings and tune if needed. RSSI operative ? Check N370/12/RSSI–line and the operation Data... - Page 14 Disassembly & Troubleshooting Instructions PAMS NHX–4N Technical Documentation This page intentionally left blank. Page 14 Original, 01/98...