Nokia 282 Troubleshooting

PAMS NHA-9

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Technical Documentation Troubleshooting

Troubleshooting Section

Contents

Required Service Equipment ................................................................................................................1

Software & Equipment Set-ups............................................................................................................1

Test Analyser Set Up RX...................................................................................................................1

Wintesla Set Up RX............................................................................................................................2

Test Analyser Set Up TX....................................................................................................................2

Wintesla Setup.....................................................................................................................................2

BB1 - Phone does not power up....................................................................................................3

BB2 (Display / keypad not operating correctly.)..........................................................................4

BB4b (Phone thinks headset accessory is inserted)..................................................................5

BB5 (Phone cannot enter local mode.).........................................................................................5

BB6 (Earpiece or external audio fault)..........................................................................................6

BB7 (Tx audio problems)................................................................................................................7

BB8 Call processing........................................................................................................................8

RX Fault 1..........................................................................................................................................9

TX Fault 1........................................................................................................................................10

RX / Tx Faults 2.............................................................................................................................11

Oscilloscope Readouts..................................................................................................................12

Software & Equipment Set-ups

Test Analyser Set Up RX

Note these setting are for the HP 8920 on a duplex test screen.

Tune Mode – Manual AF generator 1KHz Tone - 8Khz deviation Frequency – 836.52Mhz FM Coupling – AC Input Port – RF IN Audio Out – AC IF Filter – 230kHz AF Anl In – Audio In Ext. TX Key – OFF Filter 1 CCIT or Cmessage / Filter 2 15Khz LPF RF signal gen. to 881.52 MHz De-emphasis – OFF Amplitude at -116dBm Atten Hold – OFF Detector – PK+ - / 2 Output Port – RF Out Power Meter Avg. = 10 SINAD Avg. = 10

Introduction

The purpose of this section is to define module faults down to component level. The flow charts allow simple navigation by following YES /NO routes.

Note; Some flow charts have callout boxes referring to appropriate oscilloscope readouts. If you are reading the PDF version of this document these are hypertext links.

Required Service Equipment

NHA-9 WinTesla Service Software (product code: 8400597) Variable Power Supply Unit Digital Multimeter Oscilloscope NHA-9 Service Accessories (H700PI, 282) MJS-7 Test Frame (PN 0775095)

When the phone is in the Module Repair JIG, the probe must be connected to the test equipment. RS232/MBUS adapter CMT/Marconi HP8920...

Setup the cable loss:

With the HP8920, Configure > RF level offset on/off = on > RF in/out = loss of the cable.

RF Spectrum Analyser AAT-7 RF Probe

Issue 2 03/00 Page 1

PAMS NHA-9

Technical Documentation Troubleshooting

Test Analyser Set Up TX

Wintesla Set Up RX

Note these setting are for the HP 8920 on a TX test screen.

Tune mode – Manual Filter 1 - Cmessage

Set phone to Local mode. Go to Testing Menu enter Quick Testing.

Quicktest set up as follows: Ex. Audio – ON Channel 384 Compressor – ON Select RX TX PA Expander – ON Power Level 7 Volume – MID AFC – OFF

TX Frequency - 836.52Mhz Filter 2 – 15kHz TX Pwr Meas. – Peak De-Emphasis - OFF Input Port – RF IN Detector – PK+ - /2 IF Filter – 230kHz AF Gen. 1 – Freq. 1kHz Ext. TX Key – OFF AF Gen. 1 – 50mV AF Anl in – FM Demod Power Meter Avg. = 10

Wintesla Setup

Set phone to Local mode. Go to Tunings Menu enter TX Power.

Expected results with the above settings: TX Power ≅ 26 to 27.3dBm

Expected results with the above settings: Assembled Sinad between 14 to 50dB Nominal ≅ 19 to 30dB In test fixture Sinad between 14 to 50dB Nominal ≅ 19 to 30dB

Issue 2 03/00 Page 2

PAMS NHA-9

Will phone

Display / Keypad

Does display

headset

" ?

Can phone

mode?

Call setup

OK?

START

END

Perform BB7

PWRKEYX

transists

PWRKEYX transits

Check for broken PCB trace

Faulty power switch

(S2) Replace.

Correct Output

Vrx=2.8V at

Check PCB

trace for

MCUCLK short

D401 CLK falls

Replace EEPROM D402.

BBres goes

Replace R894 and retest.

LoBatt

Rst X

Page 4

Check

N9/1 in =

RegEN goes

BattMon=

Technical Documentation Troubleshooting

BB1 - Phone does not power up

Note: Do not dismantle phone.

power up?

operating correctly?

Insert MBUS cable with AUDIO EXT enabled on switch box.

say "Remove

YES

BB1

BB2

BB4b

Dismantle phone in correct fashion and place in diagnostic jig

VL=2.8 V ?

YES

Check D400 and N7 pins.

See Readout

from 2.8V to 0V when power key is pressed?

(Pin 73 of D400)

YES

high?

YES

Vbatt

from 2.8V to 0V when

power key is pressed?

(S2/3 or D400/73)

YES

Check/ replace N8 & C869

Check/ replace N9 & C839

YES

between power key and D400.

enter local

RF RX OK?

RF TX OK?

(Testing TX audio.)

BB5

Rx Fault 1

(Earphone level fault.)

Tx Fault 1

BB8

See Readout

From main OSC

G1 ?

YES

burst at pin 20

D401 when power

key pressed?

VBATT/2

YES

approx 2.8V

YES

osc G1?

YES

Replace osc G1.

Retest and if still faulty replace D400

after approx

14s?

shorts/open circuit.

Replace D401.

YES

Issue 2 03/00 Page 3

Check R850, C405, V822 & N9.

high?

Replace D401.

YES

Replace D400

PAMS NHA-9

Do keys appear

Dismantle phone and place in diagnostic jig with new

Operate all keys on pad.

Replace 'A' cover

R912 &

Check for electrical shorts on C857, C858 & C859.

Replace

Replace resistors and

Return to

front page

Replace

Replace faulty component(s)

Replace 'A' cover and

Keypad

Dismantle phone and place in

Keypad

Check/ replace

Replace 'A' cover

Visible damage

Replace S1

Technical Documentation Troubleshooting

BB2 (Display / keypad not operating correctly.)

OSCOUT

Operate all keys on phone pad.

MCUCLK

and cinch

connector.

and retest

YES

on display?

cinch connector.

Do the numbers appear on

the display?

YES

to reed Switch

S1 ?

YES

backlight

OK ?

YES

diagnostic jig with new cinch connector.

backlight

OK ?

R869, R870,

V814, R868, V815,

R867, OK?

Check / Replace D401

YES

and cinch

connector.

recheck phone.

and retest.

cinch connector.

Check R912 & 922 approx 2K2 ohm.

Replace Lid Module with known working unit.

YES

R922 OK?

OK?

D400

OK?

YES

checks.

YES

Issue 2 03/00 Page 4

D401

OK?

SCRAP.

PAMS NHA-9

Acc_ID indicates

Check headset socket in 'B'

cover

Check alignment of socket legs.

Lift cradle of jig and test outer

Check / Replace D401, R927 & R897

Visually inspect spark gaps under system

Remove spacer PCB.

Unit functions

Replace ESD device V824.

Unit still

Dismantle phone and place in diagnostic jig.

With oscilloscope, probe MBUS at system connector whilst

Scope trace

Data pulses

Data pulses at

R891 biasing

Check for short/foreign material at

Mbus spark

Is data line

Short on

Check PCB

trace from V812

to system connector.

R892

approx

See Readout

Check replace

Technical Documentation Troubleshooting

BB4b (Phone thinks headset accessory is inserted.)

Dismantle the phone and place engine in diagnostic jig.

Power up phone and call TESTIN>ADC READING from Wintesla.

"HEADSET" ?

YES

two pins of spacer PCB.

YES

Shorted?

for shorts (X359)

If in doubt, replace socket.

and retest.

BB5 (Phone cannot enter local mode.)

Power up phone.

calling VIEW>PHONE_IDENTITY from Wintesla.

10K ohm?

YES

remains low?

YES

Page 6

Replace R892 and retest.

gap under system connector. Check for shorted ESD device V824.

YES

connector X360 with microscope for shorts.

Short found?

YES

Recall ADC READINGS from Wintesla.

indicates

"Headset"?

YES

correctly?

Remove short and retest.

Check for excess solder and replace

R927, C866,

R891, OK?

Replace D401 and retest.

at pin 10 of

D401?

YES

at pin 9 of

D401?

YES

R892? (One

side is VL)

base of V812

correctly?

YES

Replace V812.

YES

Replace R891.

Check R865 approx 10K ohm.

constantly

pulled high?

YES

V812?

Replace V812

Replace D401.

Return to front page checks.

Issue 2 03/00 Page 5

YES

+ 9 hidden pages

Nokia 282 Troubleshooting

Specifications and Main Features

Frequently Asked Questions

User Manual

Software & Equipment Set-ups

BB1 - Phone does not power up

BB2 (Display / keypad not operating correctly.)

BB4b (Phone thinks headset accessory is inserted.)

BB5 (Phone cannot enter local mode.)