Nokia 8310 Repair Hints page 2

Customer Care Europe & Africa
SCCE Training Group
© 2002 Nokia Mobile Phones
GENERAL
-about Phoenix
When changing the phone mode with Phoenix, note that it is not possible to activate local mode directly from normal mode –
change to test mode first! In normal mode the phone works as it would be supplied by the normal phone battery. In local mode
the watchdog is disabled while in test mode only MCU-software is working without loading the PPM-file.
Using JBV-1 it is possible to change to local mode by suppling JBV-1 with +12VDC. If JBV-1 is supplied with +4VDC you have to
change the phone mode manually with Phoenix.
When using service jig MJS-46 take care not to supply more than +12VDC – the jig will surely be damaged!
-Component characteristics
Some components contain important data.
Several described steps are only practicable if you are able to reflash/ realign the phone and/or rewrite IMEI/SIMlock in certain
cases. Please pay attention to separate notes.
-Broken balls, µBGA
All replaceable µBGA-components must be renewed after removing. Reflow with hot air fan is not allowed!
Check soldering points, remove oxidated solderings (broken balls) carefully by enclosing few new solder before placing new
components.
µBGA must be soldered only with NMP approved µBGA-rework machines (e.g. Zevac/OK International).
Only use recommended Fluxtype and an appropriate amount of it.
-PCB handling & cleaning
To avoid damages of PCB and/or components through electrostatic discharging, handle the module in
ESD-suitable cases only. Always wear ESD-bracelets, which must be connected to earth bonding point.
Don´t make any loose wiring connections or do some other unqualified rework anywhere.
For cleaning use appropriate materials only, do not use scratching or rubbing tools.
Because of organic surface protection (OSP), cleaning must only be done with a lint-free cloth which may be moisten with DI-
water. IPA or other solvent like ethanol should only be used to clean gold pads for spring contacts without affecting the
surrounding copper layers.
-Realign after repair
Characteristics of replacement parts are different.
To prevent additional faults after repair (eg. low standby time, loosing network etc.) it is necessary
to retune phone values after repair.
© NMP 2002
CONFIDENTIAL
NHM-7
Date 28.02.2002
Checked by:
SCCE Training Group
2 (18)
Repairhints
Version 1.0 Approved
Approved by:
SCCE