Nokia Ringo2 Troubleshooting

After Sales Technical Documentation

NHN–3N

TROUBLESHOOTING

INSTRUCTIONS

Original, 47/96 NMP Part No. 0275258

Troubleshooting Instructions

After Sales

NHN–3N

Amendment
Number

Technical Documentation

AMENDMENT RECORD SHEET

Date Inserted By Comments

Page 2

Original, 47/96

After Sales

Troubleshooting Instructions

Technical Documentation

1 General

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 sub­branch.

Required servicing equipment:
– PC for Service Software
– Power supply (2.0A)
– Digital multimeter
– Oscilloscope
– Signal generator
– Spectrum analyzer

NHN–3N

– RF cables
– Service cable SCN–3
– RF–adapter AAT–2N
– Test jig JBS–3N
– RS232/MBUS adapter

2 General Troubleshooting

The General Troubleshooting chart shows the most common fault areas. These
seven fault types can be used to define the possible fault.

Original, 47/96

Page 3

Troubleshooting Instructions

After Sales

NHN–3N

START

Will turn into
local mode ?

OK

Receiver OK ?
(SINAD OK)

OK

Transmitter operating
(RF power OK) ?

Technical Documentation

Logic fault

FAIL

Receiver fault

FAIL

Transmitter fault

OK

Earphone level/

modulation (nom, max)

OK

Is display/keypad
module working ?

OK

OK

FAIL

FAIL

FAIL

Earphone level or
modulation fault

Display or keypad fault

Call set–up faultCall set–up ?

Page 4

END

Original, 47/96

After Sales

Troubleshooting Instructions

Technical Documentation

2.1 Logic fault

Logic fault

Power drops off or does
not assume local mode

OK

Check clock signal

of CLKMCU ~3.3 Vpp

FAIL

VL, VL2, VA and
VREF ~3.3 V or only

momentarily on

NHN–3N

FAIL

Voltages always 3.3 V

OK

XRES ~ 0 V

FAIL

OK

Check d.c. voltages
of N101;
– pin 17 ~1.75 V if
VBAT ~4.8 V
– pin 1, 5, 22 ~VBAT

Check;
– D201 pins 51 (CLKMCU), 21 and 53
(VL2), 67 and 68 (VREF), 12, 30,

50 and 58 (GND)

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

to 3.3V all the time.

N101/14 XPWROFF line

at least 1 microsec. pulse to 3.3 V

3 sec. intervals (momentarily)

OK

OK

OK

FAIL FAIL

N101/13 PWRONX

line 0 V pulse (momentarily)

Check;
– solderings of MUUMI N101

– loading of supply voltages
– if OK, change N101

– Check load on VL2,

VA and VREF lines

Check;
– PWR button
– V930

– ROW0

– XPWROFF line (COL0) load

– If OK, change D201

Original, 47/96

Page 5

Troubleshooting Instructions

After Sales

NHN–3N

2.2 Receiver fault

Receiver fault

Simplex sens.

(TX off)

OK

TX spectrum

OK

FAIL

FAIL

See earphone level fault

OK

AF signal at

N370/9 (DAF) OK?

Transmitter
fault

FAIL

VCCR, VREF,VSYN

OK

OK at V341
collector

FAIL

OK?

RXINJ

Technical Documentation

FAIL

OK

Check: V310, V311

V313, V314, V312

RXE, N101/4

1. IF

at N370/16

OK?

FAIL

OK

Check voltage of
N370/4, components
C378, R371, C377,
L370, if OK replace
N370

Replace duplex
filter Z700

RX–VCO

oscillating

OK

VCO–freq

OK

Check: RXINJ level at V341
collector (5–10 dBm), V341
operating voltage and bias, C341

FAIL

FAIL

Check: operating voltage of
G530

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 SCLK, SDAT and SLE

lines.

IF level

after Z350

FAIL

Check: solderings of
Z660, Z321, Z350
operation of V320
Check AGC

OK

Check operation
of V380

Page 6

Original, 47/96

After Sales

Troubleshooting Instructions

Technical Documentation

2.3 Transmitter fault

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

Transmitter fault

Transmitter
frequency

OK

OK

500<Pout<600 mW

(level High) at C642

Connections of R430, C432.VCTCXO operating
voltage and freq. =14.85 MHz. Check SCLK,SDAT
and SLE lines.

FAIL

FAIL

FAIL

TX–VCO

freq and spectrum

OK (TXE OFF)

Power OK after

tuning

OK

OK

OK

Buffer V440

output freq. and

spectrum OK
(TXE OFF)

OK

N601 freq.

and spectrum OK

when duplex filt.

not connected

NHN–3N

FAIL

OK

Check: V440 operating
voltage and bias, C440
R442, C443, C604, C442

Check soldering of duplex
filter Z660. If OK replace
filter.

OK

Check Z660 TX–pin
soldering. If OK replace
Z660

Check: R647, V642,R660
C643, VREF, TXC, TXE,
R657, R656, V640, V651,
V650, V653

Replace N601

FAIL

OK

FAIL

Vpc N601/1

2.5–3.5 V (level High)

OK

TXINJ level

6–12 dBm after

Z601

FAIL

FAIL

Check: C631, C641, C660
C642, C634, C635, C608
C625, C602. If Ok
replace N601.

Replace G430

Original, 47/96

FAIL

VCO output

level –4–+2 dBm

Check operating voltage

OK

and bias of V440. Check
C440, R442,C604. If OK
replace V440.

Page 7

Troubleshooting Instructions

After Sales

NHN–3N

2.4 Audio fault

EARPHONE LEVEL / MODULATION LEVEL FAUL T

SIGNAL LEVELS OF AUDIO CIRCUiT N701

MIC

XMIC

MICAM

XMIC

TXMUX+TXAAF

PIN 46 PIN 47

220mVrms 205mVrms

TXATT

TXBPO
COMI
COMO
EMPI

MICTRI

TXBP

PIN 49
PIN 50
PIN 51

TXBPO

COMI

COMPR

205mVrms
145mVrms
145mVrms

CWCI

COMO

Technical Documentation

EMPI

PREEM AGC LIM

TXTRI+TXPOSTFIL

TXLP

WTRFIL+WPOSFIL

SUM

PIN 55

MOD

178mVrms

Signal levels are measured by oscilloscope and input signal frequency is 1 kHz, deviation 3kHz and generator voltage level 260mV.

HF CONTROL

DAF

DAF

RXTRI

PIN 27

RXAAF EXP

54mVrms

RXMUX+AAFIL

DEEMP+RXFIL

EAMPBO

FILOEXPI

FILO
EXPI
EAMPBO
EXPO
VOLI

PIN 28
PIN 29
PIN 30
PIN 32
PIN 34

EXPO

VOL

VOLI

114mVrms
114mVrms
80mVrms
160mVrms
160mVrms

RXATT

EARP
EARM

EAR

ACC

PIN 38
PIN 37

EARP
EARM

EVGND

EARM

315mVrms
318mVrms

Signal levels are measured by oscilloscope and received signal audio frequency is 1 kHz, deviation 3kHz and power level –53dBm.

Page 8

Original, 47/96

After Sales

Troubleshooting Instructions

Technical Documentation

2.5 Display or keyboard fault

Display or keypad fault

FAIL

Lights OK ?

OK

KEYBOARD
FAULT

Display does’nt work

D201/29 LIGHTS
line at + V with
lights on

OK

Check operation of
switches V43 and V45

Pulses to 3.3V
on COL0–4 lines at
~50 ms intervals

FAIL

FAIL

NHN–3N

Check load in lights line

(R920, R921, R922, R923, R924)

Check COL0–4 lines from
keyboard to D201

OK

Check pins

Pin 33 V5OUT ~–6.5 V

Pin 38 VCI ~3.3V

OK

Check pin

Pin 31 V5 ~–5.0V

OK

ROW0–2 lines are to carry 3.3V
and pulses to 0 V at ~50 ms
intervals when corresponding
key depressed

FAIL

clock signals

Pin 37 C1+ 3.3V/7.2kHz

Pin 35 C2+ 6.6V/7.2kHz

Check soldered joints of D100

FAIL

Check R901–904 and C902, C903

OK

OK

FAIL

Check components;
– C900, C901

Original, 47/96

Check;
Display foil solder joints;
D100/40/LCDRES 3.3V

Page 9

Troubleshooting Instructions

After Sales

NHN–3N

2.6 Call set–up fault

Call set–up fault

Phone will not
assume SERV – mode

OK

Subscriber data OK ?

FAIL

Technical Documentation

Check subscriber data and country codes and
correct them if needed.

OK

RSSI operative ?

OK

Data
detection of N701
operative ?

OK

Replace N701

FAIL

FAIL

Check RSSI tunings and tune if needed.
Check N370/12/RSSI–line and the operation

Inspect the signal path from test point DAF
to N701/27
Check also other lines to N701.

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Original, 47/96

After Sales

Troubleshooting Instructions

Technical Documentation

NHN–3N

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Original, 47/96

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