Nokia NPE-4 Service Manual page 2

Customer Care Europe & Africa
SCCE Training Group
General
-How to use this document
Place the schematics behind this manual.
Now you are able to follow these specifictions with graphical layouts and it is easier for you to find the components and
measuring points.
-General handling
Be very careful when disassembling the NPE-4/NPL-1 while removing the A-Cover from the Back-Cover. Refer to disassembling
instructions at the service manual of NPE-4/NPL-1.
-µBGA components and broken balls
Special attention to µBGA components:
All replaceable µBGAs must be renewed after removing. Reflow using a hot air fan is not allowed.
Check soldering points and remove oxidated solderings (broken balls) carefully by enclosing a few new solders before placing new
components. The only allowed way changing µBGA components is to use µBGA rework maschines, approved from NMP (e.g.
ZEVAC/ OK International). Use recommended Fluxtype and an appropriate amount of it only.
-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.
Do not 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 moistening 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.
-Component charactaristics
Some components contain important data.
Several described steps are practicable only if you are able to reflash/ realign the phone and/ or rewrite IMEI/ SIMlock in certain
cases. Please pay attention to separate notes.
-Realign after repair
Characteristics of replacement parts are different.
To prevent additional faults after repair (RX quality, TX power etc.) it is necessary to retune phone values.
© NMP 2002
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 15.08.2002
Checked by:
SCCE Training Group
2 (25)
Repairhints
Version 1.0 Approved
Approved by:
SCCE