Nokia Mobile Phones NHX-4N Guía

PAMS Technical Documentation

NHX–4N

DISASSEMBLY &

TROUBLESHOOTING

INSTRUCTIONS

PAMS

Technical Documentation

NHX–4N

Disassembly & Troubleshooting Instructions

Page 2 Original, 01/98

AMENDMENT RECORD SHEET

Amendment

Number Date Inserted By Comments

PAMS

Technical Documentation NHX–4N

Disassembly & Troubleshooting Instructions

Page 3

Original, 01/98

CONTENTS

Page No

Disassembly instructions Page 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Trobleshooting Page 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Troubleshooting Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Logic fault Page 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver fault Page 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmitter fault Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audio fault Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display or keyboard fault Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Call set–up fault Page 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PAMS

Technical Documentation

NHX–4N

Disassembly & Troubleshooting Instructions

Page 4 Original, 01/98

Disassembly instructions

2) Remove screw

covers (3 pcs) with

screwdriver

1) Remove the

antenna

3) Remove back

cover screws (3 pcs)

4) Remove

back cover

5) Disconnect:

battery connector (1),

microphone connector (2),

and earphone connector (3)

with tweezers

6) Remove

battery

7) Remove

chassis screws

PAMS

Technical Documentation NHX–4N

Disassembly & Troubleshooting Instructions

Page 5

Original, 01/98

8) Remove

transceiver

module

9) Turn around,

Loosen the light guide carefully

from both sides of the PCB with

flat headed tool

10) Lift display carefullly

Remove screws (3 pcs)

11) Chassis and module

can now be separated

PAMS

Technical Documentation

NHX–4N

Disassembly & Troubleshooting Instructions

Page 6 Original, 01/98

General Trobleshooting

The object of troubleshooting is to define the faulty module block, and then to

locate the faulty component. The troubleshooting diagram has been planned so

that the fault, whatever it is, can be found as simply as possible.

The flow charts give you the overview of the blocks. The purpose is that you

proceed through the flow diagram so that, if your answer is YES for the asked

question, go straight to the next level, but if your answer is NO, go the sub-

branch.

Required servicing equipment:

– PC for Service Software

– Power supply (2.0A)

– Digital multimeter

– Oscilloscope

– Signal generator

– Spectrum analyzer

– RF cables

– Service cable SCN–3

– RF–adapter AAT–4X

– Test jig JBS–3N

– RS232/MBUS adapter

PAMS

Technical Documentation NHX–4N

Disassembly & Troubleshooting Instructions

Page 7

Original, 01/98

General Troubleshooting

START

Logic fault

Receiver fault

Will turn into

local mode ?

Receiver OK ?

(SINAD OK)

Transmitter fault

Transmitter operating

(RF power OK) ?

Earphone level/

modulation Earphone level or

modulation fault

END

Display or keypad fault

Is display/keypad

module working ?

Call set–up faultCall set–up ?

FAIL

The General troubleshooting chart shows

the most common fault areas These seven

fault types can be used to define the pos-

sible fault.

(nom, max)

PAMS

Technical Documentation

NHX–4N

Disassembly & Troubleshooting Instructions

Page 8 Original, 01/98

Logic fault

Check clock signal

of CLKMCU ~3.3 Vpp

XRES ~ 0 V

Check;

– D201 pins 51 (CLKMCU), 21 and 53

(VL2), 67 and 68 (VREF), 12, 30,

50 and 58 (GND)

– XPWROFF line (COL0) load

– If OK, change D201

Check MBUS connection

d.c. voltages;

– D201/9 TXD ~3.3 V

– D201/10 RXD ~3.3 V

– X100/2 M2BUS ~3.3 V

Above lines are to show

Check d.c. voltages

of N101;

– pin 17 ~1.75 V if

VBAT ~4.8 V

– pin 1, 5, 22 ~VBAT

Voltages always 3.3 V

Check;

– solderings of MUUMI N101

– loading of supply voltages

– if OK, change N101

– Check load on VL2,

VA and VREF lines

Power drops off or does

not assume local mode

VL, VL2, VA and

VREF ~3.3 V or only

momentarily on

N101/14 XPWROFF line

at least 1 microsec. pulse to 3.3 V

3 sec. intervals (momentarily)

Check;

N101/13 PWRONX

line 0 V pulse (momentarily) – PWR button

– V930

– ROW0

to 3.3V all the time.

FAIL

FAIL FAIL

FAIL

PAMS

Technical Documentation NHX–4N

Disassembly & Troubleshooting Instructions

Page 9

Original, 01/98

Receiver fault

TX spectrum

Replace duplex

filter Z660

AF signal at

N370/9 (DAF) OK?

Transmitter

fault

Simplex sens.

(TX off)

Receiver fault See earphone level fault

FAIL

Check: V310, V311

V313, V314,

N101/4

FAIL FAIL

VCCR, VREF,VSYN

OK?

RXINJ

OK at V341

collector

FAIL

RX–VCO

oscillating

1. IF

at N370/16

OK?

FAIL

Check operation

of V380

FAIL

Check: solderings of

Z660, Z321, Z350

operation of V320

FAIL

IF level

after Z350 OK

Check: voltage of N370/4,

components C378, R371,C377,

if OK replace N370

Check: operating voltage of

G530

VCO–freq FAIL

Check: resistance through

N820/3, R521, R522, R523

voltage N820/4,14

Connections of R530, C532

VCTCXO operating voltage

and frequency = 14.85 MHz.

Check: RXINJ level at V341

collector (5–10 dBm), V341

operating voltage and bias, C341

Check SCLK, SDAT and SLE

lines.

Z370, L370,

PAMS

Technical Documentation

NHX–4N

Disassembly & Troubleshooting Instructions

Page 10 Original, 01/98

Transmitter fault

Transmitter

frequency

590<Pout<980 mW

Check Z660 TX–pin

soldering. If OK replace

Z660

FAIL

FAIL Power OK after

tuning OK

Vpc N601/1

FAIL

2.5–3.5 V (level 1,2,3)

FAIL

TXINJ level

6–12 dBm after

Z601

FAIL

Check: R647, V642,R660

C643, VTSYN, TXE, TXC

R641, R655, R649, R640,

V650, V641, V640

VCO output

level –3...+3 dBm OK

Replace G430

FAIL TX–VCO

freq and spectrum

FAIL

(level High) at C642

OK (TXE OFF)

Buffer V430

output freq. and

spectrum OK

(TXE OFF)

Check: resistance through N820/17,R421, R422, R423

Connections of R430, C432.VCTCXO operating

voltage and freq. =14.85 MHz. Check SCLK,SDAT

and SLE lines.

FAIL

N601 freq.

and spectrum OK

when duplex filt.

not connected

Check: V430 operating

voltage and bias, C440

R440, C443

OK Check soldering of duplex

filter Z660. If OK replace

filter.

FAIL

Check: C631, C641, C660

C642, C634, C635, C608

C625, C602. If Ok

replace N601.

FAIL

Buffer V440

output freq. and

spectrum OK

(TXE ON)

Check: V440 operating

voltage and bias, C450,

R455, C454, TXE

Check operation of V430

and V440

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