Nokia 8210, 8850 Service Manual NSM 23_1

CONFIDENTIAL 1 (35)

NSM-2/3
Service & Analysis Center Europe Repairhints Version 2.0 Approved
SACE CC Training Group 2000-10-16

Repair-Hints

8210/8850

NSM-2/3

HD 914/916

© 2000 NMP

Checked by:

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NSM-2/3
Service & Analysis Center Europe Repairhints Version 2.0 Approved
SACE CC Training Group 2000-10-16

GENERAL

-How to use this document

Put the QUICK REPAIR layouts behind this manual.
Now you are able to follow these specifications with graphical layouts and it is easier for you to find the
components and measurepoints.

-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 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.

-Realign after repair

Characteristics of spare 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.

© 2000 NMP

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Service & Analysis Center Europe Repairhints Version 2.0 Approved
SACE CC Training Group 2000-10-16

Contents

GENERAL 2

INTRODUCTION 4

PHONE DOES NOT SWITCH ON 5

LOW STANDBY TIME 9

CONTACT SERVICE 11

PHONE SWITCHES OFF 12

NOT CHARGING 13

SIMCARD FAULTS 15

NO SERVICE 18

FREQUENCY LIST 27

INTERNAL AUDIO 28

USER INTERFACE 30

CLOCK TIME PROBLEMS 31

SIMLOCKS 32

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Service & Analysis Center Europe Repairhints Version 2.0 Approved
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INTRODUCTION

IMPORTANT:

This document is intended for use by authorised NOKIA service centers only.

The purpose of this document is to provide some further service information for NOKIA 8210/8850 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 built 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 : NSM2 03.11.00- 25.05.2000
Nokia Module Jig : MJS 9
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: [e-mail]

© 2000 NMP

Checked by:

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NSM-2/3
Service & Analysis Center Europe Repairhints Version 2.0 Approved
SACE CC Training Group 2000-10-16

PHONE DOES NOT SWITCH ON

Check current consumption

OFFSTATE: 0-1mA SLEEPMODE: 1-4mA

Call mode: 130-400mA. If too high continue

with section "low standby/operation mode

time"

Check Vb~4V at C129

OK

Check if PWRONX at S330 drops to 0V

during pressing the powerswitch

OK

Check 32,768kHz at J228 3,2Vpp

squarewave

OK

Check Vbb 2,8V at C107

OK

Check Vxo 2,8V at C152

OK

Check Vref 1,5V at C106

nOK

nOK

nOK

nOK

nOK

nOK

Check X101 if bend or soiled, also

check L103

Check/change S330,R118

Check/change B100, R100/102/154,

C101/102/113

Check resistance of line to GND,

value should ~60k, if line ok, change

Check resistance of line to GND,

value should ~45k, if line ok, change

Check resistance of line to GND,

value should ~50k, if line ok, change

N100

N100

N100

nOK

Change N100

Check PURX 2.8V at J227 after pressing

Check 13MHz REFCLK at C213,~800mVpp

© 2000 NMP

OK

Check SLEEPX 2,8V at J226

OK

powerswitch

OK

OK

Try to flash the phone

nOK

nOK

nOK

nOK

MAD is faulty in all probability.

Swap, because MAD is not

changeable

Change N100

Check Values around G830, N505

Continue with section "Flash update

and V800

not possible

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Battery connector

Check if bent or soiled.
Clean pads of connector on PCB if soiled.

Power on/off switch S330 faulty

Check that PWRONX at S330 decreases to 0V during pressing the powerswitch.

B100

Check voltage at B100, both 1.6V DC.
Check 32.768kHz sinewave at C102, 700mVpp.
Check parts around B100- like R100, R102, R154, C101, C102.
Check sleepclock 32.768kHz squarewave at J228, 3.2Vpp.

G830 Reference oscillator faulty

Check Vcc 2.7V at C831 and Vcon (varies between 0.3V and 2.3V) at C832.
Check 26MHz Clk-frequency at C830, 900mVpp.
Check 13MHz Clk-frequency at C829, 300mVpp. If not ok, check values around N505.
Check 13MHz Clk-frequency at C213, 800mVpp. If not ok, check values around V800.

N100 CCONT faulty

Check Vb 3.6V at C129.
Check that PWRONX decreases to 0V at S330 when powerswitch is pressed. Also check R118.
Check 32.768kHz squarewave 3.2Vpp at J228.
Check 13MHz Clk-frequency at C213.
Check Vbb 2.8V at C107.
Check Vxo 2.8V at C152.
Check Vref 1.5V at C106.
Check SLEEPX 2.8V at J226.
Check PURX 2.8V at J227.

Probably broken solderings under CCONT N100. Replace CCONT with µBGA rework machine.
Note that it is necessary to run energy management calibration after changing CCONT!

D200 MAD faulty.

Check 32.768kHz squarewave at J228.
Check 13MHz Clk-frequency at C213.
Check Vbb 2.8V at C201.
Check SLEEPX 2.8V at J226.
Check PURX 2.8V at J227.
MAD is probably faulty, swap the unit, because MAD is not changeable.

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FLASH UPDATE NOT POSSIBLE

Check fault code

from prommer

MCU boot failure,

serial clock line failure, serial

data line failure

YES

Connect "watchdog disable"

R118 to GND

OK

Check Vbb 2.8V at C107, Vxo

2.8V at C152

OK

Check SLEEPX 2.8V

at J226

OK

nOK

nOK

NO

Algorithm code fail,

alias ID missing

Update FPS4 box

with latest flash

device list, try to

update again.

Continue with

section "phone does

not switch on"

MAD faulty

nOK

NO

External RAM failure

YESYES

Check values at D200, if OK,­Swap, Combo Memory should

be the reason

© 2000 NMP

Check PURX 2.8V at

J227

OK

Check 13MHz RFCLK

at C213, ~800mVpp

OK

Check Mbus/Fbus lines

(J101-J103) for shorts to

GND. Also check

R109/201/203/215

OK

If error persists, PCB

or MAD should be

the reason.

nOK

nOK

Change CCONT

(N100)

Check values around

G830, N505, V800

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Mbus / Fbus lines faulty

Check that there´s no short at J101- J103 to GND, resistance of lines should be between 60kOhm and 220kOhm.

ComboMemory

If “algorithm code / alias ID missing from prommer box” appears while flashing, make sure that your FPS4 box is updated
with the latest flash device list.

Contact service

If “contact service” appears while flashing, change C205 from 1µF to 2.2µF (Code 2610203) to stabilize flash programming
voltage.

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NSM-2/3
Service & Analysis Center Europe Repairhints Version 2.0 Approved
SACE CC Training Group 2000-10-16

Low standby / operation mode time

Check power

consumption of

phone

Off state 0-1mA

OK

Sleepmode 1-4mA

OK

Check charging circuit, run

energy management calibration

nOK nOK

Lift L103

OK

Check capacitors in Vb line

or change

N100/101/220/310/401 if

necessary

nOK

Check resistance of output

voltage lines of CCONT to GND

nOK

OK

Change CCONT

nOK

Continue with section "not

charging"

Check capacitors

C702-704, C754/755

nOK

Change N702

Check components in

corresponding lines

Please note that standby time also depends

(Paging-Repeat-Period), signal strengh

(min.-98dBm), location updates and not at

© 2000 NMP

OK

Calibrate RX/TX values of the

phone

OK

on network side, like PRP

least users handling of phone.

nOK

Continue with section "RX/TX

faults"

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Check the current consumption in different operation modes:

Funktion mode Minimum current in mA Maximum current in mA
Off state 0 1
Sleep mode 1 4
Call mode GSM 900 140 400
Call mode GSM 1800 130 370

Off state current fail

Lift L103 to define the fault if off state current is not ok.
If current is still not ok, lift C702/703/704 and C754/755 one by one.
If fault remains, change power amplifier N702, which is the reason in most cases.
If current is ok after removing L103, resolder it. After that you have to check capacitors in Vb line
(C100,C105,C129,C142,C165…).
If fault remains, change N100, N101, N220, N310 or N401. In most cases CCONT (N100) is responsible for this fault.

Sleep mode current fail

Check resistance of every output voltage line of CCONT (N100) to GND. The values should be higher than 10kOhm,
except Vsyn1 ( 3kOhm ) and Vsyn2 ( 0.9kOhm ).
If resistance of any line is not ok, check/change parts of this line.
If resistance of all lines is ok, change CCONT (N100).

If the standby/operation mode time is still not ok, check the charging circuit and run the energy management calibration.
It can also be necessary to calibrate the RX/TX values of the phone.

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Service & Analysis Center Europe Repairhints Version 2.0 Approved
SACE CC Training Group 2000-10-16

CONTACT SERVICE

This fault means that the phone software is able to run and thus the watchdog of CCONT (N100) can be served.
Selftest functions run when power is switched on and software is executed from ComboMemory.
If any selftest fails, a “Contact Service“ text is shown on LCD.

Possible failures:

MCU ROM Checksum failed

Try to flash the phone. If not ok after flashing, probably ComboMemory is faulty, which is not changeable.

CCONT Interface failed

Probably broken solderings under CCONT (N100).
If CCONT is not underfilled, replace it with µBGA rework machine.
If not ok after reworking the CCONT, probably MAD or PCB faulty.
Note that you have to run energy management calibration after changing CCONT!

COBBA parallel/serial failed

Check Vbb 2.8V at C201 and VCOBBA 2.8V at C248.
Check COBBAClk at J252.

Probably broken solderings under COBBA (N250) – replace COBBA. If fault remains, MAD or PCB faulty.
Note: IMEIdata and SIMlock must be rewritten after COBBA- change, also retune RF-values.

DSP alive test failed.

In most of all DSP alive selftest failures MAD is faulty, which is not changeable.

Eeprom tune checksum failed

Use WinTesla to check if phonedata like Imei, product-code or PSN are corrupted.
If phone data is ok, try to reset the phone. If phone data is not ok or fault remains after reset, ComboMemory is faulty
in all probability.

RTC Battery failed

First try to charge RTC battery by switching on the phone for 10 to 15 minutes.
If fault remains, check contact springs of battery, bend them if nessecary.
(Also see NSM-2 Service Bulletin 20).
In some cases it can be necessary to change RTC battery and/or CCONT (N100).

© 2000 NMP

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