NEC Confidential & Proprietary
3.8. No camera
3.9. Problem in reading SIM
3.10. Keypad no function
Try to change a new upper
board, still the same fault ?
Replace the upper board
IC401(Helen) is dead or bad
contact
Yes
No
Check contacts of Z291 SIM
connector, OK ?
Clean or replace SIM
connector
Insert a good SIM and then
switch on the mobile
IC251 is dead or bad contact
Check IC251 #60 (VSIM)
=3V ?
Check IC251#64(SIM_DATA),
#65(SIM_CLOCK), #66
(SIM_RESET) , OK?
IC301 (Trident 2) is dead or
bad contact
IC251 is dead or bad contact
Yes
Yes
Yes
No
No
No
Reinsert Key FPC to J621,
OK ?
Change a new key PCB, OK?
IC401 (Helen1) is dead or
bad contact
No
No
Replace key PCB
Yes
Содержание N8
Страница 1: ...N8 Service Manual Level 3 ...
Страница 3: ...NEC Confidential Proprietary Next Section Main Menu Section 1 Precautions for Repair Work 1 ...
Страница 8: ...NEC Confidential Proprietary Previous Section Next Section Main Menu Section 2 Unit Specifications 2 ...
Страница 24: ...NEC Confidential Proprietary PROGRAMMING CABLE Picture ...
Страница 29: ...NEC Confidential Proprietary KEY SHEET ASSEMBLY ...
Страница 30: ...NEC Confidential Proprietary INTER CONNECTION ...
Страница 31: ...NEC Confidential Proprietary RF BLOCK DIAGRAM ...
Страница 36: ...NEC Confidential Proprietary Mixer and IF Ref 26MHz from TCXO 880 915MHz 1710 1785MHz 1850 1910MHz ...
Страница 52: ...NEC Confidential Proprietary DATA CABLE ...
Страница 55: ...NEC Confidential Proprietary SIMPLE HANDSFREE DESKTOP CHARGER Input 5 3V 0 51A Two charge slots ...
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Страница 69: ...NEC Confidential Proprietary 8 Key Sheet Assy LOWER KEY SHEET ASSY INTO FRONT COVER M ...
Страница 84: ...NEC Confidential Proprietary Previous Section Next Section Main Menu Section 6 Troubleshooting 6 ...
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Страница 105: ...NEC Confidential Proprietary Previous Section Next Section Main Menu Section 7 Device Information 7 ...
Страница 106: ...NEC Confidential Proprietary IC121 MAY YC0059 T001 HD155148TF BLOCK DIAGRAM ...
Страница 107: ...NEC Confidential Proprietary OUTLINE DIAGRAM TOP VIEW ...
Страница 110: ...NEC Confidential Proprietary IC251 MAY YB0002 T001 PSC2011CHRS DT BLOCK DIAGRAM ...
Страница 111: ...NEC Confidential Proprietary OUTLINE DIAGRAM TOP SEE THROUGH ...
Страница 112: ...NEC Confidential Proprietary PIN INFORMATION ...
Страница 113: ...NEC Confidential Proprietary PIN INFORMATION CONTINUED ...
Страница 114: ...NEC Confidential Proprietary PIN INFORMATION CONTINUED ...
Страница 115: ...NEC Confidential Proprietary IC301 MAY YB0003 B001 TR09BFTGB17IN2B DB BLOCK DIAGRAM ...
Страница 116: ...NEC Confidential Proprietary OUTLINE DIAGRAM TOP SEE THROUGH ...
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Страница 124: ...NEC Confidential Proprietary OUTLINE DIAGRAM PIN INFORMATION 1 VDD 2 VSS 3 N C 4 VOUT 2 4 3 1 ...
Страница 126: ...NEC Confidential Proprietary OUTLINE DIAGRAM TOP SEE THROUGH ...
Страница 129: ...IC421 MAY YA0017 A001 MPD89064K9 001 4AA OUTLINE DIAGRAM ...
Страница 130: ...NEC Confidential Proprietary IC854 MAY YC0068 T001 MM1612FN BLOCK DIAGRAM OUTLINE DIAGRAM PIN INFORMATION ...
Страница 133: ...NEC Confidential Proprietary U111 MAY YY0020 T001 RF3110 BLOCK DIAGRAM OUTLINE DIAGRAM ...
Страница 134: ...NEC Confidential Proprietary PIN INFORMATION ...
Страница 135: ...NEC Confidential Proprietary Previous Section Next Section Main Menu Section 8 Circuit Diagrams 8 ...
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Страница 153: ...NEC Confidential Proprietary Previous Section Next Section Main Menu Section 10 Parts List 10 ...
Страница 172: ...NEC Confidential Proprietary Previous Section Main Menu Section 11 Glossary of Terms 11 ...