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

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

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"

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.

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