PAGE 13 (28) Approved 2.0
Nokia Mobile Phones Customer Care E&A
SQX 00288-en MWy
Technical Services Repair Concepts
Confidential
01.10.2001
5. TROUBLESHOOTING
5.1 LAYOUTS
o In this section you will get some general hints how to repair the 8310.
o When cleaning the pads you have to use a soft cloth and isopropanol. It is not allowed to use a glass fiber
pencil because it scratches the surface and will lead later on to corrosion.
o The 3 switches and the RTC-Battery have to be desoldered with two solder irons.
o Soldering with hot air gun is totally forbidden because of the very sensitive µBGA components and µVia
technology.
o Note: 5V SIM cards are no longer supported by NHM–7 baseband.
bottom side UI module LK5
bottom side radio module LA5
top side radio module LA5
LCD contact pads
Speaker Item 005
Board to Board contact pads
SIM reader X386
System Connector pads
Battery Connector X101
RTC Backup Battery G300
Board to Board Connector X303
Power Switch S300
LCD Connector X300
olume Switches S301, S302
Service Manual 8310 Level 2 Copyright 2001 © Nokia Mobile Phones
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