Nokia 7110 User manual

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Repairhints
7110
NSE-5
HD 945

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GENERAL
-How to use this document
Put the QUICK REPAIR layouts behind these manuals.
Now you are able to follow these specifications with graphical layouts and it is easier for you to find the
components and measuring points.
-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.
-Underfills, broken balls, µBGA
It is not possible to change underfilled components. The trial will damage PCB surely. All replaceable
µBGA-components must be renewed after removing.
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).
Use only recommended Fluxtype and an appropriate amount of it.
Clean very careful the PCB after every rework and take great pains over the keyboard area. Don´t make any
loose wiring connections anywhere.
If it is necessary to change any item located under the metal shields, remove the shield first,
don´t cut partially or bend it.

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1. INTRODUCTION
IMPORTANT:
This document is intended for use by authorized NOKIA service centers only.
The purpose of this document is to provide some further service information for NOKIA 7110 phones.
It contains a lot of collected tips and hints to find failures and repair solutions easily.
It will also give support to the inexperienced technicians.
Saving process time and improving the repair quality is the aim of using this document.
We have build it up based on fault symptoms (listed in "Contents") followed by detailed description for further
analysis.
It is to be used additionally to the service manual and other service information like Service Bulletins, for that
reason it doesn't contain any circuit descriptions or schematics.
All measurements are made using following equipment:
Nokia repair SW : WinTesla Version 6.43
DLL version : NSE5 version 271.03.00 / 19.07.2000
Nokia Module Jig : MJS-8
Digital multimeter : Fluke 73
Oscilloscope : Hitachi V-1565; Fluke PM 3380A/B
Spectrum Analyzer : Advantest R3361C with an analogue probe
RF-Generator / : Rohde & Schwarz CMD 53
GSM Tester
While every endeavour has been made to ensure the accuracy of this document, some errors may exist. If any errors
are found by the reader, NOKIA should be notified in writing, using following procedure:
Please state:
Title of the Document + Issue Number/Date of publication.
Page(s) and/or Figure(s) in error.
Please send to: Nokia GmbH
Service & Analysis Center Europe
Meesmannstr.103
D-44807 Bochum / Germany
Email: [email protected]

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Contents
GENERAL 2
INTRODUCTION 3
INSERT SIMCARD 5
SIMCARD NOT ACCEPTED 7
PHONE DOESN`T SWITCH ON 9
FLASH UPDATE NOT POSSIBLE 11
CONTACT SERVICE PROBLEMS 13
NOT CHARGING 14
NO SERVICE GSM 900 17
NO SERVICE GSM 1800 18
FAULTY SPECTRUM CHARTS 20
TX FAILURE 21
INTERNAL AUDIO FAILURE 23
EXTERNAL AUDIO FAILURE 24
MICROPHONE DOESN`T WORK 25
ROLLERKEY PROBLEMS 27
SIMLOCKS 29

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INSERT SIMCARD
Insert SIMcard
Check soldering and
contacts of X100
Check signals at X100,
(see next page)
pin1 -SIMclk;
pin2 -SIMrst;
pin3;5 -VSIM;
pin6 -SIMdata
Change N100
Check lines to GND at
C116/129/130/131.
Values must be >100k
Also check R120
D300 or PCB
faulty
Resolder or
change X100
OK
not OK
not OK
OK
not OK

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VSIM after switching on the phone without SIMcard. CCONT pulses up VSIM for four times, the first
time the amplitude is 3 Volt, the next three times it is 5 Volt.
If the phone is switched on with SIMcard, VSIM stays on the level with which the SIMcard works,
expected that SIMcard is not dirty or damaged.
Note that SIMClock and SIMData are only present when SIMcard is active, for example when phone registers to
network.
SIMReset is low-active, that means that the SIMcard will be reseted when SIMReset is 0 Volt. This is the case after
switching on the phone (diagram above). While VSIM is already high, SIMReset keeps low for a few milliseconds – in
this time the card will be reseted.

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SIMCARD NOT ACCEPTED
"SIMCard not accepted" appears on
LCD
Use WinTesla to open
"QuickInfo"- window.
Compare shown SIMlock data with the
listed entries of the respective product code
Rewrite SIMlock settings with NOKIA
SECURITY PASSWORD or send phone to
SACE. If SIMlock is corrected or inactive, but
fault stays on- change COBBA* and rewrite
SIMlock data.
SIMlock is OK.
If the MSIN data field is closed to a special IMSI
number range, only the operator is authorized to
open the SIMlock.
See General SB 065
OK
notOK
*NOTE: If COBBA or D301 was changed, SIMlock & IMEI
data must be rewrite.
Also realign RX/TX values, especially TX I/Q !
Change D301 if is
permitted to you to
rewrite IMEI
Send Phone to SACE if
it is not permitted to
you to rewrite the IMEI
notOK notOK

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X100 SIMcard Reader
-Check solderings of connector.
-Check if bend or soiled, change if necessary.
SIM lines shorts to GND
-Check resistance of SIM lines to GND at C116, C129, C130, C131,- value should be higher than
100kOhm.
-Check also R120.
N100 CCONT faulty
-Check SIMClock, SIMData, SIMReset and VSIM.
-It´s also possible that broken solderings under CCONT N100 are the reason for this fault. Remove CCONT,
tinplate oxidized pads carefully with only a little bit of flux and solder, replace CCONT with µBGA
rework machine.
N200 COBBA faulty
-If “SIM card not accepted” appears on LCD, but SIMlock-settings are ok or no SIMlock is set, it is
necessary to change COBBA N200.
Note that you have to rewrite SIMlock-data and tune Rx/Tx-values of the phone after changing the
COBBA,

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PHONE DOESN`T SWITCH ON
Phone doesn`t switch on
Check VB 3,6VDC at C134
PWRON at R413 drops to 0V while
pressing PWR Button
32,768kHz squarewave at C150
~3,5Vpp.
V_BB 2,8VDC at C139
V_XO 2,8VDC at C112
V_REF 1,5VDC at C140
PURX 2,8VDC at R147
13MHz RFCLK at R301
Change X101/102 if bend or
soiled.
Check L102
Change display assy.
Check R413
Change N100
Check V_BB line for shorts to
GND. No shorts- change N100
Check V_XO line for shorts to
GND. No shorts- change N100
Check V_REF line for shorts to
GND. No shorts- change N100
Change N100
Check values around G701.
Change G701, use code
4510217, not 4510229
Try to flash the phone Continue with section "FLASH
NOT POSSIBLE"
OK
OK
notOK
OK
OK
OK
OK
OK
OK
notOK
notOK
notOK
notOK
notOK
notOK
notOK

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Battery connector X101, X102
-Check solderings of X101, X102.
-Check if connectors are bend or soiled.
Power on/off switch faulty
-Check that PWRON at R413 decreases to 0V during pressing the powerswitch.
-Check display connector X400, change display assy if necessary.
B100 problems
-Check voltage at B100, both Pins 1,6VDC.
-Check 32,768kHz sinewave signal level at C104.( 700mVpp).
-Check parts around B100 like R117, R118, R121, R135, C103, C104, C149.
-Check 32,768kHz squarewave at J318 (3,3Vpp).
G701 Reference oscillator faulty
-Check Vcc 2,8V at G701.
-Check Vcont ( may vary between 1 and 3.5V ).
-note that it is necessary to change G701 if frequency error is higher than 50Hz.
N100 CCONT faulty
-Check Vb 3,6Vat C134.
-Check that PWRON decreases to 0V at R413 when powerswitch is pressed.
-Check 32,768kHz squarewave at J318.
-Check 13MHz Clk-frequency at R301.
-Check Vbb 2,8V at C139.
-Check Vxo 2,8V at C112.
-Check Vref 1,5V at C140.
-Check PURX 2,8V at R147.
-Probably broken solderings under CCONT. Try to tinplate the oxidized pads careful with only a little bit
of flux and solder.
D300 MAD faulty
-Check 32,768kHz squarewave at J318.
-Check 13MHz Clk-frequency at R301.
-Check Vbb 2,8V at C139.
-Check PURX 2,8V at R147.
-MAD is probably faulty, swap the phone because MAD is not changeable.