Nokia 6820a Service Manual 08 nsb 9 trouble

CCS Technical Documentation

NSB-9 Series Transceivers

Troubleshooting Instructions

Issue 1 04/03 Nokia Corporation

NSB-9

Troubleshooting Instructions CCS Technical Documentation

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CCS Technical Documentation Troubleshooting Instructions

RF Troubleshooting

Introduction

This document describes the methods of RF troubleshooting for Iris NSB-9 transceiver. Fault finding charts of the most common fails are included in this document. Arrows are marked with 9 (OK) and 8 (NOT OK), respectively. Measurement equipment is marked as:

DMM Digital Multimeter

OSC Oscilloscope

SA Spectrum Analyzer

Figures of typical signals and voltages at each testpoint are described in Chapter 8.

Location of testpoints are described in Chapters 9 and 10.

EQUIPMENT NEEDED:

NSB-9 module jig MJS-48, power and DAU-9S cables

DC power supply 3.9 VDC >3A

Radio Communication Tester with GSM850/1900 option

Spectrum analyzer and probe with frequency range up to 4 GHz

Digital multimeter (DMM)

Oscilloscope with 10:1 probe

PC with Phoenix software

USEFUL HINTS

Sometimes it is difficult to get reliable measurement results at high frequencies (500...4000 MHz) because of probe properties etc. If measurement results of faulty phone don't correspond to the results shown in this document it may be useful to measure a reference phone and finally, compare the results.

Special attention shall be paid with internal antenna. Visual inspection of antenna module (shape of radiator metal) is needed to verify that antenna is GSM850/1900 antenna not GSM900/1800 used in similar European product. Both antennas behave very similarly in MJF-32 jig so it may be impossible to distinguish them by doing measurements over air interface.

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TROUBLESHOOTING IN CASE OF RF TUNING FAIL

Channel Select Filter Calibration

Calibration is done using internal calibration circuit (UEM sends and receives a test signal to/from Hagar). VCO (G650), RX-bandfilters (Z501, Z551) and TX-filter/balun (Z700, T700) don't have any effect to the Channel Select Filter Calibration. Instead, baseband shall be functional (=VCTCXO G660 is running). Any failure in Hagar, its supply voltages or RX/TX IQ-lines may cause this calibration to be failed.

If baseband works and there are not any visible cause around Hagar (missing or broken components etc.), Hagar shall be replaced at first place.

RX Calibration

The most probably reason for this is lack of gain in receiver chain. Check rx chain according to RX850/1900 fault finding charts. In GSM850 RX, components Z520, V500 and Z501 should be checked. In GSM1900 RX, components Z520, V550 and Z551 should be checked.

If signal seems to pass rx chains with adequate gain, VCO function shall be checked. It is also possible that signal passes rx chain to Hagar and VCO is functional but signal doesn't appear in RX IQ-lines. In this case, Hagar shall be replaced.

RX AM Suppression Calibration

RX AM Suppression Calibration limits (LOPI, LOMI, LOPQ and LOMQ) are so wide that the calibration results can't exceed the limits. Instead, RSSI value measured after tuning may be too high. Also in this case, replacing Hagar may improve the result.

RX Band Filter Response Compensation

If RX Calibration results are ok but this compensation fails, the most probably reason for this is lack of gain (or too big gain) in receiver chain in some frequency. Check rx chain according to RX850/1900 fault finding charts. Retest rx chain also in low and high channels. In GSM850 RX, components Z520 and Z501 should be checked. In GSM1900 RX, components Z520 and Z551 should be checked.

TX Power Level Tuning

The most likely reason for this is lack of gain in transmitter chain. Check tx chain according to TX850/1900 fault finding charts. In GSM850 TX, components Z500, L750, N700 and Z700 should be checked. In GSM1900 TX, components Z500, L750, N700 and T700 should be checked.

If signal seems to pass tx chains with adequate gain, VCO function shall be checked. It is also possible that signal doesn't appear in TX IQ-lines. In this case, baseband shall be checked.

TX IQ Tuning

TX IQ tuning fails, if IQ-spikes in the spectrum can't be tuned low enough. If replacing Hagar doesn't help with this issue, VCO component (G650) and components around it

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shall be checked.

TX 850 Troubleshooting

Phoenix commands

RF Controls ⇒ Band GSM 850 TX ⇒ Burst mode

Channel 190 ⇒ TX Power Level 10

TX PA Mode Free ⇒ TX Data Random

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Figure 1: Fault finding chart, TX850

Check VCTCXO

output signal at TP20

26 MHz

9

Check TX IQ signals

at TP21

9

Check TX modulator

output signal at TP24

836.6 MHz

OSC

SA

8

Check VCTCXO

supply voltage at TP3

2.78 VDC ± 3%

DMM

9

Check VCTCXO

control voltage at

TP13

1.1 VDC ± 200 mV

9

Change VCTCXO

G660

Check SHF VCO

output signal at TP40

3346.4 MHz

DMM

SA

8

Start baseband

troubleshooting (UEM)

Start baseband

troubleshooting (UEM)

Start baseband

troubleshooting (UEM)

8

Check VCO supply

voltage at TP7:

2.78 VDC ± 3%

DMM

9

DMM

Check Hagar ASIC

supply voltages at

TP4, TP5, TP6, TP8:

2.78 VDC ± 3%

TP10: 1.35 VDC ± 2%

TP1: 4.75 VDC ± 3.2%

9

Check VCO control

1.1 VDC ± 200 mV

Change

Hagar ASIC

N600

8

troubleshooting (UEM)

9

voltage at TP41:

DMM

89

Change

8

SHF VCO

G650

Start baseband

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99

Check PA output

signal at TP60

836.6 MHz

9

TP51, SCLK TP52,

8

SA

Check PA control

voltage at TP27

VBATT (∼3.9 VDC)

9

Change PA

N700

Check SDATA at

SLE TP53

9

Change

Hagar ASIC

N600

Check PA supply

voltage at TP9

9

OSC

8

signal at TP23

8

OSC

DMM

8

Check TXC

9

Change

Hagar ASIC

N600

Start baseband

troubleshooting (UPP)

Check VBATT path

from battery connector

to PA

OSC

Start baseband

8

troubleshooting

(UEM)

Check coupler output

signal at TP61

836.6 MHz

9

Check TX output

signal at TP30

836.6 MHz

9

TX is ok

SA

8

Change

coupler

L750

Check antenna switch control signal at TP62

2.78 V squarewave

OSC

9

Change antenna

switch Z500

8

Change Hagar

ASIC N600

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TX1900 TROUBLESHOOTING

Phoenix commands

RF Controls ⇒ Band GSM 1900 TX ⇒ Burst mode

Channel 661 ⇒ TX Power Level 10

TX PA Mode Free ⇒ TX Data Random

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Figure 2: Fault finding chart, TX1900

Check VCTCXO

output signal at TP20

26 MHz

9

Check TX IQ signals

at TP21

9

Check TX modulator

output signal at TP22

1880 MHz

OSC

SA

8

Check VCTCXO

supply voltage at TP3

2.78 VDC ± 3%

DMM

9

Check VCTCXO

control voltage at

TP13

1.1 VDC ± 200 mV

9

Change VCTCXO

G660

Check SHF VCO

output signal at TP40

3760 MHz

DMM

SA

8

Start baseband

troubleshooting (UEM)

Start baseband

troubleshooting (UEM)

Start baseband

troubleshooting (UEM)

Check VCO supply

voltage at TP7:

2.78 VDC ± 3%

8

DMM

9

DMM

Check Hagar ASIC

supply voltages at

TP4, TP5, TP6, TP8:

2.78 VDC ± 3%

TP10: 1.35 VDC ± 2%

TP1: 4.75 VDC ± 3.2%

9

Check VCO control

voltage at TP41:

2.7 VDC ± 200 mV

89

Change

Hagar ASIC

N600

8

Start baseband

troubleshooting (UEM)

8

9

DMM

Change

SHF VCO

G650

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99

Check PA output

signal at TP25

1880 MHz

9

TP51, SCLK TP52,

8

SA

Check PA control

voltage at TP26

VBATT (∼3.9 VDC)

9

Change PA

N700

Check SDATA at

SLE TP53

9

Change

Hagar ASIC

N600

Check PA supply

voltage at TP9

9

OSC

8

signal at TP23

8

OSC

DMM

8

Check TXC

9

Change

Hagar ASIC

N600

Start baseband

troubleshooting (UPP)

Check VBATT path

from battery connector

to PA

OSC

Start baseband

8

troubleshooting

(UEM)

Check coupler output

signal at TP28

1880 MHz

9

Check TX output

signal at TP30

1880 MHz

9

TX is ok

SA

8

Change

coupler

L750

Check antenna switch control signal at TP29

2.78 V squarewave

OSC

9

Change antenna

switch Z500

8

Change Hagar

ASIC N600

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RX850 troubleshooting

Phoenix commands

RF Controls ⇒ Band GSM 850 RX ⇒ Continuous mode

Channel 190 ⇒ AGC 8 FEG ON + 46 dB

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Figure 3: Fault finding chart, RX850

Apply input signal

881.667 MHz

-50 dBm

9

Check VCTCXO

output signal at TP20

26 MHz

OSC

9

Check RX signal at

antenna switch output

TP63

881.667 MHz

9

Check RX signal at

dual filter output TP64

881.667 MHz

SA

8

Check VCTCXO

supply voltage at TP3

2.78 VDC ± 3%

DMM

9

Check VCTCXO

control voltage at

TP13

1.1 VDC ± 200 mV

DMM

9

Change VCTCXO

G660

8

Start baseband

troubleshooting (UEM)

Start baseband

troubleshooting (UEM)

Change antenna

switch Z500

Change dual filter

Z520

9

Check RX signal at

LNA output TP66

881.667 MHz

9

Check RX signal at

filter output TP68

881.667 MHz

9

SA

Check LNA voltages

8

at TP65 1 VDC

TP67 2.6 VDC

Check LNA V500 and

other components

around it

Change filter Z501

9

DMM

If R501 and R502 are

8

ok, change Hagar

ASIC N600

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9

Apply input signal

881.667 MHz

-90 dBm

9

OSC

Check RX IQ signal at

TP37

9

Start baseband

troubleshooting (UEM)

Check SHF VCO

8

output signal at TP40

3526.4 MHz

Check Hagar ASIC

supply voltages at

TP4, TP5, TP6, TP8:

2.78 VDC ± 3%

TP10: 1.35 VDC ± 2%

TP1: 4.75 VDC ± 3.2%

9

SA

DMM

Start baseband

troubleshooting (UEM)

8

Check VCO supply

voltage at TP7:

2.78 VDC ± 3%

Check VCO control

voltage at TP41:

1.8 VDC ± 200 mV

8 9

Change

Hagar ASIC

N600

8

Start baseband

troubleshooting (UEM)

8

DMM

9

DMM

Change

SHF VCO

G650

9

Check SDATA at

TP51, SCLK TP52,

SLE TP53

9

Change

Hagar ASIC

N600

OSC

8

Start baseband

troubleshooting (UPP)

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RX1900 Troubleshooting

Phoenix commands

RF Controls ⇒ Band GSM 1900 RX ⇒ Continuous mode

Channel 661 ⇒ AGC 8 FEG ON + 46 dB

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Figure 4: Fault finding chart, RX1900

Apply input signal

1960.067 MHz

-50 dBm

9

Check VCTCXO

output signal at TP20

26 MHz

OSC

9

Check RX signal at

antenna switch output

TP31

1960.067 MHz

SA

9

8

Check VCTCXO

supply voltage at TP3

2.78 VDC ± 3%

DMM

9

Check VCTCXO

control voltage at

TP13

1.1 VDC ± 200 mV

DMM

9

Change VCTCXO

G660

8

Start baseband

troubleshooting (UEM)

Start baseband

troubleshooting (UEM)

Change antenna

switch Z500

Check RX signal at

dual filter output TP32

1960.067 MHz

9

Check RX signal at

LNA output TP33

1960.067 MHz

9

Check RX signal at

filter output TP36

1960.067 MHz

9

SA

8

Check LNA voltages

8

at TP34 2.6 VDC

TP35 0 VDC

Check LNA V550 and

other components

around it

Change filter Z551

9

DMM

Change dual filter

If R551 is ok, change

8

Hagar ASIC N600

Z520

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9

Apply input signal

1960.067 MHz

-90 dBm

9

OSC

Check RX IQ signal at

TP37

9

Start baseband

troubleshooting (UEM)

Check SHF VCO

8

output signal at TP40

3920 MHz

Check Hagar ASIC

supply voltages at

TP4, TP5, TP6, TP8:

2.78 VDC ± 3%

TP10: 1.35 VDC ± 2%

TP1: 4.75 VDC ± 3.2%

9

SA

DMM

Start baseband

troubleshooting (UEM)

8

Check VCO supply

voltage at TP7:

2.78 VDC ± 3%

Check VCO control

voltage at TP41:

3.3 VDC ± 200 mV

89

Change

Hagar ASIC

N600

8

Start baseband

troubleshooting (UEM)

8

DMM

9

DMM

Change

SHF VCO

G650

9

Check SDATA at

TP51, SCLK TP52,

SLE TP53

9

Change

Hagar ASIC

N600

OSC

8

Start baseband

troubleshooting (UPP)

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Figures of signals and voltages in testpoints

Figure 5: TP20: 26 MHz VCTCXO output signal

Figure 6: TP21: TX I/Q signal

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Figure 7: TP22: TX1900 modulator output signal

Figure 8: TP23: TXC signal from UEM ASIC

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Figure 9: TP24: TX850 modulator output signal

Figure 10: TP25: TX1900 PA output signal

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Figure 11: TP 26: TX1900 PA power control signal

Figure 12: TP27: TX850 PA power control signal

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Figure 13: TP 28: TX1900 signal at coupler output

Figure 14: TP29: Antenna switch control signal in TX1900 mode

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Figure 15: TP30: TX850 signal at antenna pad

Figure 16: TP30: TX1900 signal at antenna pad

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Figure 17: TP31: RX1900 signal at antenna switch output

Figure 18: TP32: RX1900 signal at dual SAW filter output

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Figure 19: TP33: RX1900 signal at LNA output

Figure 20: TP34, TP35: RX1900 LNA control signals (Burst mode)

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Figure 21: TP36: RX1900 signal at 2nd band filter output

Figure 22: TP37: RX IQ signal (Burst Mode)

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Figure 23: TP37: RX IQ signal (GSM850, Continuous Mode, Signal level -90 dBm)

Figure 24: TP37: RX IQ signal (GSM1900, Continuous Mode, Signal level -90 dBm)

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Figure 25: TP40: SHF VCO output signal in TX850 mode

Figure 26: TP40: SHF VCO output signal in TX1900 mode

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Figure 27: TP40: SHF VCO output signal in RX850 mode

Figure 28: TP40: SHF VCO output signal in RX1900 mode

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Figure 29: TP51,52,53: SDATA, SCLK and SLE signals in GSM850/1900 mode

Figure 30: TP60: TX850 PA Output Signal

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Figure 31: TP61: TX850 signal at coupler output

Figure 32: TP62: Antenna switch control signal in TX850 mode

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Figure 33: TP 63: RX850 signal at antenna switch output

Figure 34: TP 64: RX850 signal at dual SAW filter output

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TP 65, 67: RX850 LNA control signals (Burst mode)

Figure 35: TP 66: RX850 signal at LNA output

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Figure 36: TP68: RX850 signal at 2nd band filter output

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FM Radio Troubleshooting

Introduction

This document describes the methods of FM radio troubleshooting for Iris NSB-9 transceiver.

EQUIPMENT NEEDED

NSB-9 module jig MJS-48, power and DAU-9S cables

DC power supply 3.9 VDC >3A

Digital multimeter (DMM)

Audio Analyzer

Oscilloscope with 1 MHz 1:1 probe

PC with Phoenix software

Headset (HDB-4 or HDS-3)

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FM RADIO SCHEMATICS

Figure 37: Input signal connection to antenna (headset cable)

Figure 38: Input signal single to differential conversion

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Figure 39: VCO components

Figure 40: Connection to UPP

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Figure 41: Audio signal output

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FM Radio layout

Figure 42: Components

Figure 43: Components on PWB

Note! Components L105, L106, L107, L108, L109, C108, C109, C110, C111, R164, R165, R166, R167, R170 and R171 are not shown in the picture. Components are placed near audio amplifier N150.

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Figure 44: FM radio testpoints

AUDIO AMPLIFIER

HSEAR R

VFLASH2

HSEAR L

J359, FMCLK

J356, FMCTRLDA

J358, FMWREN

J357, FMCTRLCLK

FM RADIO R FM RADIO L

J104, HSEAR P

J105, FM RADIO

ANTENNA INPUT

J103, HSEAR R N

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Figure 45: FM radio fault finding chart

Turn on FM radio in local

mode. Does the radio start?

9

Apply RF input signal

= 98 MHz

f

0

∆f= 75 kHz

f

= 1 kHz

m

level= -90 dBm

Set radio channel to

98 MHz

Set audio volume to

maximum (100%)

9

Check audio signal at audio

amplifier N150 input (C170

and C171).

Is the frequency 1 kHz and

amplitude 0.5…0.8 Vpp?

Check components around

8

FM radio serial bus and

clock signal (C374, C375,

R357 and R361).

Check 32 kHz clock signal

at J359. Does the radio

start now?

9

Replace N356.

Does the radio start

now?

8

Check supply voltages at

TEA5767 (N356) pins 7 and

34 (2.78 VDC).

Does the radio start now?

9

Check N356 soldering

8

(all pins).

Does the radio start

now?

8

Baseband digital

failure (UPP)

Set radio channel and RF

generator to 88.1 Mhz. Re-

9 Audio amplifier failure

check audio signal level

(0.5…0.8 Vpp at C170 and

C171). Re-check also in

107.9 MHz.

9

(N150)

8

Check RF input

components (C108…C111,

L109, C367, C378, 379 and

L358).

Re-check audio signal at

C170 and C171. Is the

frequency 1 kHz and

amplitude 0.5…0.8 Vpp?

8

9

8

Check VCO components (V356,V357, L356, L357,

C357, C358, C362, R359,

(0.5…0.8 Vpp at C170 and

R360).

Re-check audio signal

C171) in 88.1 MHz and

107.9 MHz.

9

Replace TEA5767

(N356)

Re-check audio signal

(0.5…0.8 Vpp at C170

and C171) in 88.1

MHz and 107.9 MHz.

8

Replace transceiver

NSB-9

9

8

Check audio amplifier

output (R164…R167,

L105…L108).

Check audio signal at J103

and J104. Is the frequency

1 kHz and amplitude

0.015…0.3 Vpp?

9

FM radio is OK

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REFERENCE MEASUREMENT RESULTS

Figure 46: Audio output signal

Signal 1: Audio output signal at PWB test points J103 and J104 (FM test signal, audio volume 100%)

Signal 2: Audio output at FM radio pins 22 and 23 (same signal as in C170 and C171)

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Figure 47: Reference clock signal from UPP

FM radio clock at test point J359 (32 kHz clock signal when radio is turned on)

Figure 48: RF input signal

15:51:49 03 JUL 2002

#AT 0 dBREF -20.0 dBm

PEAK LOG

10 dB/

WA SB

CORR

SC FS

CENTER 98.0000 MHz SPAN 300.0 kHz

#RES BW 10 kHz VBW 10 kHz #SWP 1.00 sec

MKR 97.9280 MHz

-71.03 dBm SWEEP

CONT SGL

FREE RUN

VIDEO

LINE

EXTERNAL

SYNC CRD

TV TRIG

FM modulated test signal at FM radio ASIC pin 37, at the other end of L358

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Figure 49: VCO signal

10:46:24 03 JUL 2002

#AT 10 dBREF .0 dBm

PEAK LOG

10 dB/

WA SB

CORR

SC FS

CENTER 196.450 MHz SPAN 1.000 MHz

#RES BW 10 kHz #VBW 10 kHz #SWP 20.0 msec

MKR

196.440 MHz

-9.40 dB

MEAS UNCAL

SWEEP

CONT SGL

FREE RUN

VIDEO

LINE

EXTERNAL

SYNC CRD

TV TRIG

VCO frequency at FM radio pins 3 and 4, at the other ends of V356 and V357

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Baseband Troubleshooting

PWB Test points

Figure 50: Flash programming testpoints

J101, BSI

J102, BTEMP VBAT

FBUS RX

FBUS TX

GND

MBUS

VPP

J1, RESET

J2, RFBUSDA

J3, RFBUSCLK

J4, RFBUSEN1

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J410, MBUSRX

J412, FBUSRX

J100, VBAT

J409, MBUSTX

J404, SLEEPCLK

J411, FBUSTX

J415, DBUSEN1X

VCORE

VFLASH2

J402, PURX

J403, SLEEPX

VANA

Figure 51: Baseband testpoints

VBATT6

VFLASH1 VIO

VBATT4

VBATT2

VBATT3

VBATT1

VBATT5

J405, UEMINT

J414, DBUSDA

J413, DBUSCLK

J419, FLSCLK

J418, FLS2CSX

J420, FLSCSX

J416, EXTWRX

J417, EXTRDX

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J404, SLEEPCLK

J407, CBUSDA

J402, PURX

Figure 52: SIM testpoints

VIO VSIM

J408, CBUSENX

J406, CBUSCLK

SIMRST

SIMCLK

VSIM

SIMRST

SIMIODA

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Troubleshooting Instructions CCS Technical Documentation

Figure 53: Miscellanous testpoints

EARP EARN

J306 J302

FLIP CLOCK FLIP VBAT FLIP GND FLIP DATA

J305 J301

J304 J308

J303 J307

J153, CLK

J152, ENB

N301 HALL-SENSOR

J154, DATA

Audio amplifier

control lines, some

are placed under

dome sheet

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CCS Technical Documentation Troubleshooting Instructions

J150, IHF -

J151, IHF +

V319 UPPER FLIP VBAT SWITCH

V319 LOWER FLIP VBAT SWITCH

VIBRA VBAT

UEM VIBRA

J331, HALL SENSOR OUTPUT

J106, MICN

J107, MICP

X102

PIN 1

GND VCHAR

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Signal Name Function Test Point Signal Characteristics Notes

FBUS_TX Flash programming data and phone

FBUS_RX Flash programming data and phone

MBUS Flash programming clock and phone

BSI Flash programming startup

VPP Flash programming voltage PRODTP6 1.8V, up to12V during

VR1A Power supply for Hagar PLL charge

VR2 Power supply for TX modulator C706 2.8 V VR3 Power supply for VCTCXO C662 2.8 V Controlled by SLEEPX signal VR4 Power supply for Hagar C601 2.8 V VR5 Power supply for Hagar C603 2.8 V VR6 Power supply for Hagar C605 2.8 V VR7 Power supply for VCO R652 2.8 V

Signal Name Function Test Point Signal Characteristics Notes VSIM Power supply for SIM card C390/conn. 1.8 or 3.0V Level depend on SIM card type SIMRST SIM reset C387/conn. digital signal Level depend on SIM card type SIMIODAO SIM data C386/conn. digital signal Level depend on SIM card type SIMCLKO SIM clock C388/conn. 3.25 MHz digital clock

SLEEPX Sleep mode control J403 1.8-0V, digital signal

PURX Power up reset J402 1.8-0V, digital signal SLEEPCLK Sleep clock J404 1.8-0V, 32 kHz digital

Signal Name Function Test Point Signal Characteristics Notes VBATTO_1 Power supply for VANA,VR3,VR4

VBATTO_2 Power supply for

VBATTO_3 Power supply for VCORE regulator C262 = VBAT VBATTO_4 Power supply for VR1A,VR1B and

VBATTO_5 Power supply for VR5 and VR6

VBATTO_6 Power supply for VIO regulator C265 = VBAT RFCLK System clock for baseband C420 13 MHz analog signal Requirement > 0.3 Vpp RF_BUSDA Hagar control serial data J2 0 -1.8V, digital signal RF_BUSCLK Hagar control serial clock J3 0 -1.8V, 13 MHz digital

Signal Name Function Test Point Signal Characteristics Notes CBUSCLK Serial clock J406 1.8-0V, 1MHz digital clock

CBUSDA Serial data input/output J407 1.8-0V, digital signal Controlled by MCU

control

signal,battery size indicator, local mode switch, SIM card detection

pump

and VR7 regulators

VFLASH1,VFLASH2 and VSIM regulators

VR2 regulators

regulators

PRODTP2 2.8-0V, digital signal From phone to prommer or PC

PRODTP3 2.8-0V, digital signal From prommer or PC to phone

PRODTP7 2.8-0V, digital signal,

Battery connector and J101

C600 4.75 V

C260 = VBAT

C261 = VBAT

C264 = VBAT

C263 = VBAT

clocks up to 6.5MHz

2.8-0V, analog ADconverter and digital signal

flash programming

signal

clock signal

signal

Bidirectional phone control

2.8V pulse when flashing starts, approx. 1.0V in normal mode and 0V in local mode

Internal programming voltage 1.8V , external 12V

Level depend on SIM card type

Controlled by MCU

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CBUSENX CBUS selection and enable J408 1.8-0V, digital signal

VIO Power supply for LCD, UPP and flash

VFLASH1 Power supply for LCD, IR and flash

VANA Power supply for UEM (AD, RF and

VCORE Power supply for UPP C208 1.0-1.8V programmable 1.8 V used in NHM-4, initial value is 1.5V DLIGHT DC/DC converter control Converter

Signal Name Function Test Point Signal Characteristics Notes RESET Hagar reset J1 0 -1.8V, digital signal RF_BUSEN1 Hagar chip select and latch enable J4 1.8-0V, digital signal XRES LCD reset X300/2 1.8-0V, digital signal SI LCD serial data input X300/3 0 -1.8V, digital signal SCI LCD serial clock input X300/6 0 -1.8V, 3.25 MHz digital

XCS LCD chip select X300/5 1.8-0V, digital signal EXTRDX Flash memory read enable J417 1.8-0V, digital signal FLSCSX Flash memory chip select J420 1.8-0V, digital signal FLSCLK Flash memory clock in burst mode J419

EXTWRX Flash memory write enable J416 1.8-0V, digital signal

Signal Name Function Test Point Signal Characteristics Notes

VBAT Battery voltage for UEM, power

memory

audio codecs)

amplifier, DC/DC converter, IR,

C207 1.8V

C205 2.8V

C206 2.8V

pin8

Battery connector

VBAT

∼∼∼∼

clock signal

0 -1.8V,

35 MHz digital

∼∼∼∼

clock signal

3.6V 3.1V – 4.2V

Controlled by MCU

Burst mode only when read

audio amp, keyboard leds and vibra

BTEMP Battery temperature, test mode

switch

Battery connector

and J102 FBUSRX FBUS from UEM to UPP J412 0 -1.8V, digital signal FBUSTX FBUS from UPP to UEM J411 1.8-0V, digital signal UEMINT Interrupt request for UPP J405 0 -1.8V, digital signal DBUSDA DBUS clock J414 0 -1.8V, digital signal Controlled by DSP DBUSCLK DBUS data input/output J413 0 -1.8V, 13 MHz digital

Controlled by DSP

clock signal DBUSEN1X DBUS selection and enable J415 1.8-0V, digital signal Controlled by DSP MBUSRX MBUS from UEM to UPP J410 1.8-0V, digital signal MBUSTX MBUS from UPP to UEM J409 1.8-0V, digital signal

Issue 1 04/03 Nokia Corporation Page 51

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Troubleshooting Instructions CCS Technical Documentation

Troubleshooting steps

The following hints help to find the problem if the circuitry seems to be faulty. The instructions are divided into following sections:

1. Phone is dead

2. Flash faults

3. Phone is jammed

4. Charging fault

5. Sim card fault

6. Audio faults

7. Display faults

8. Keypad fault

9. FM-radio faults

The first thing to do is to carry out a thorough visual check of the module. Ensure in particular that:

1. there is no any mechanical damages

2. soldered joints are OK

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Main troubleshooting tree

TOP

Phone is

totally dead

o

Flash

programming

doesn´t work

Phone doesn´t

start up or the

phone is

jammed

Yes

Phone

is dead

Flash faults

Phone

is

jammed

Charging

doesn´t work

TOP

2

Yes

Charging

fault

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TOP

2

Phone doesn´t

read SIM card

o

Audio faults

Display or

LED´s doesn´t

work

Yes

SIM card fault

Audio

faults

Display

faults

Keypad

doesn´t work

Yes

Keypad

faults

o

FM Radio

doesn´t work

Yes

FM

Radio

faults

No

END

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NoN

N

NoN

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CCS Technical Documentation Troubleshooting Instructions

Phone is dead

Phone

is

dead

Phone current is

0mA?

o

Phone current is

< 26mA

Phone current is

26-30mA

Yes

Check X100 solder.

Check L260 – L265 and

C260 – C265.

Check all VBAT lines.

Is phone flash

programing

OK?

o

Yes

o

Phone

is

ammed

Flash

fauItIs

Is phone in

LOCAL mode

Yes

Retest

Check BSI line

X100, C114, R202, C240,

R206 Are they

OK?

o

Yes

Change UEM

Change defect part

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Flash faults

The phone does not set FBUSTX

line high after

the startup.

o

The phone does not set FBUSTX line low after the

line has been

high.

Yes

Measure BSI

pulse during

Flash

programming.

Is it OK ?

Yes

Measure FBUSTX

line during Flash

programming from

testpoint J411. Is

it ~1.8V

Yes

Check BSI line. X100,

C114, C240,

R202, R206

Check R109

if OK,

Change

UEM

Change

UPP

Change

UPP

o

Flash faults

page 2

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Flash faults

page 2

Wrong manufactor ID and Device ID

o

Is the phone

totally dead?

Phone doesn´t

start up or the

phone is

jammed?

Yes

Change

FLASH

Phone

is dead

Phone

is

jammed

Retest

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Phone is jammed

Phone

is

ammed

Measure VIO,

VCORE, FLASH1,

VANA, VR3 voltages.

Are they OK?

Yes

Measure 32.6kHz

Sleep CLK from

testpoint J404. Is it

OK?

Yes

Measure 13MHz

RFClk from R420. Is it

OK?

Yes

Check VBATT 1-6

VIO, VCORE,

FLASH1, VANA,

VR3 lines. Are they

OK?

Yes

Measure 32.6kHz

Sleep Clk from B200. Is it OK?

Yes

o

Measure 26MHz

RFClk from C660.

Is it OK?

Yes

Check L260-L265

C260-C265

BSI/BTEMP lines and

VBATT lines

Check BSI/BTEMP

lines. If OK and UEM

regulators are not working. Change

UEM

Check B200, C209,

Check R661, C661,

R660, C660 and

VR3 line. If OK,

change G660.

Check R420, C420. If

OK change N600

C210

Change UEM

Measure PURX signal

from testpoint J402.Is it

high (~1.8V)?

Yes

Jammed

page2

o

Change UEM

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OK?

CCS Technical Documentation Troubleshooting Instructions

Jammed

page2

Phone shutdown

after 30s

o

Measure DBUSClk

1 Mhz signal from testpoint J413. Is it

Yes

Read phone info.

Is it OK?

Yes

No

Measure watchdog

signal CBUSDA

from testpoint J407

Is it OK?

o

Measure FBUSRX

signal during

phone info read

from testpoint 412.

Is it OK?

Yes

o

Yes

Change UPP

Change UEM

Retest

Measure FBUSTX

signal during phone

info read from

testpoint J411. Is it

Yes

o

Change UPP

Change UEM

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Charging fault

Charging

fault

Connect

ACP

(

charger

-7)

Battery bar doesn´t

work (scroll)

Yes

Measure voltage

over V100 Is it > 3.0

Vdc?

Yes

Read BTEMP value.

(Compare it to

ambient temperature)

Is it ~25 C (0319)?

Retest

o

Check X101, X102, F100, L100, V100, C100, C101

and charger line.

Check X100, C114, R202,

C220, R207 and

line. Are they OK?

Yes

Change defected part

Re-calibrate BTEMP and

retest.

Yes

Measure charger

current through F100.

Is it ~350...390mA

with ACP-7?

-

Yes

Retest

o

Check R200. Is

it OK?

Yes

Change defect , re-calibrate and

retest

Change UEM

o

Change defected part,

recalibrate charge

current/voltage.

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CCS Technical Documentation Troubleshooting Instructions

SIM card fault

SIM card

Insert SIM or

Card rejected

fault

Yes

Check X386. Is

it OK?

Yes

Try to set

phone in local

mode. Is it OK?

Yes

Measure VSIM

voltage at X386. Is it

~3.0V

Change defected

part

Check BSI-line

including X100,

C100, C240, R202

and R206. If OK,

change UEM

Check VSIM line

X386, C390, C203.

If OK, change

R388. If still fail,

change UEM.

Yes

Retest

Check SIM

power-up

sequence. Is it

OK?

Yes

Check SIM lines

X386. If OK,

change R388. If still

fail, change UEM.

Change UPP

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Audio faults

Audio

faults 1

Is the earpiece

working ?

Yes

Try to change the

earpiece. Is it working now?

o

Set phone to LOCAL mode. Set routing

EXT IN, HP OUT by using phoenix

“Audio Routing and Test Signals” test

Measure DC offset

voltage from earpiece

pads (against GND).

Is it ~1.36V ?

Yes

Measure MICB2 voltage

from XMICP (X102 /

pin10). Is it ~1.9V with

headset?

Yes

Check L150, C180,

C181, R152, R153

and line. If OK ->

change UEM

Check L103, R161,

o

C163, C162, R156, R157, C158, C152,

C159 and line. If OK

-> change UEM

Retest

Yes

Audio

faults 2

Earpiece 2

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Earpiece

2

Connect external 1kHz (sine

200mVpp) audio signal in XMICP

line and ground line to XMICN

line.

Measure

differential sine

signal from

earpiece pads. Is

it ~190mVpp?

Yes

Retest

No

Measure signal

from C152,

(XMICP). Is it

~110mVpp?

o

Check L150,

Yes

Check L103, L104, R161,

C163, C162, R156, R157,

C158, C152, C159 and

corresponding componenets

from XMICN line.

R152, R153,

C180, C181 If

still fail, change

UEM

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Troubleshooting Instructions CCS Technical Documentation

Audio

faults 2

Is the IHF

speaker

working?

Yes

Change

defected part

and retest

o

Set phone in LOCAL mode. Use

Phoenix “Audio Routing and Test

Signals” test. Set output path as IHF

Measure DC

offset voltage

from speaker

pads (J150 / J151

to GND). Is it

~1.9V?

Check IHF

speaker

connections.

Is it OK?

speaker

(1

Yes

o

Try to change

IHF speaker.

Is it working

now?

Check L151, L152, R162,

C172 and

line. OK?

Yes

Retest

o

Change defected

parts

Yes

Check data

communication of

audio amp. control

lines J152, J153,

J154. Is it OK?

Audio

faults 3

IHF 2

Yes

Change N150

1) If not working set first “All outputs off” and after that “IHF speaker”

Check lines if OK

o

change UPP.

If NOK change

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IHF 2

Use Phoenix “Audio Routing and

Test Signals” test. Use internal

sine wave generator and set

signal frequency to 1kHz and

peak level to 4000 Hex

Measure

differential sine

signal from IHF

speaker pads

J150, J151. Is it

~810mVpp?

o

Check C174,

C179, C178, R163

and XAUDIO(7)

line. Are they OK?

o

Change defect part and retest

Yes

Retest

Yes

Change UEM

and retest

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Audio

faults 3

Is the

External

Audio out

working?

Yes

Change defected

part and retest

o

Set phone in LOCAL mode. Use Phoenix

“Audio Routing and Test Signals” test. Set

output path as HP speaker. Insert headset to

Measure DC offset

voltage from

HSEAR P&N and

HSEAR R P&N

lines. Is it ~2.0V?

Check system

connector and

soldering. Are

they OK?

route audio to HSEAR

(2

o

Check X102 L103 - L106, C108 C111, C115 - C118, R111 - R114, C165,

C167, R164 - R167

and line. OK?

o

Change defected

parts

Audio

faults 4

Yes

communication of

audio pa control lines

J152, J153, J154. Is

Ext. audio

out 2

Yes

Check data

it OK?

Yes

Change N150

Check lines if OK

change UPP.

o

If NOK change

radio module

TB9

2) If not working set first “All outputs off” and after that “HP speaker”, after that insert headset again

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Ext.

audio out

2

Yes

Use Phoenix “Audio Routing and

Test Signals” Test. Use internal

sine wave generator and set

signal frequency to 1kHz and

peak level to 4000 Hex

Measure differential

sine signal from

HSEAR P&N and

HSEAR R P&N

speaker pads. Is it

~60mVpp?

Yes

Retest

o

Check C174,

C169 and

XAUDIO(7) line.

Are they OK?

o

Change defect part and retest

Yes

Change UEM

and retest

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Audio

faults 4

Is internal

microphone

working ?

Yes

Check microphone connector. Is it OK

o

Try to change

microphone. Is it

working now?

o

Set phone in LOCAL mode. Use Phoenix

“Audio Routing and Test Signals” Test. Set

Connect external 1kHz (sine 30mVpp)

audio signal in MICP line and ground line

routing HP in Ext out

Yes

Measure MICB1 voltage

from MICP (J107). Is it

~2.1V ?

Yes

to MICN line

(3

Yes

Change defect part and

Check L110, C153,

o

R155, C154 and

line. If OK -> change

retest

Retest

UEM

Audio

faults 5

Measure sine signal

from HSEAR and

HSEAR R lines. Is it

~160mVpp with

headset?

Yes

Retest

o

Check R154, C150

and line. If OK ->

change UEM

3) If you don’t get such a small signal out from signal generator, use resistor network to attenuate

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Audio

faults 5

Is external

microphone

working ?

Yes

o

Set phone in LOCAL mode. Use Phoenix

“Audio Routing and Test Signals” Test. Set

Connect external 1kHz (sine 200mVpp)

audio signal in XMICP line and ground line

Check if external

audio device is OK?

Yes

Check system

connector X102. Is

it OK ?

Yes

routing Ext in HP out

Yes

Measure MICB2 voltage from XMICP (X102 / pin

10). Is it ~2.0V with headset?

Yes

to XMICN line.

(4

o

C162, R157, C158 and line. If

Retest with

undamaged ext. audio

device.

Change defect part and

retest

Check L103, R161, C163,

OK -> change UEM

Check C159 If OK, change

UEM

Yes

Measure sine signal

from EARP and EARN

lines. Is it ~190mVpp?

END

Yes

Retest

4) If not working set “Loops Off” and after that “Ext in HP out” again

o

Check L103, R161, C163, C162, R156,

R157, C158, C152, C159 and also

corresponding componenets from

XMICN line line. Change defect part.

Measure signal from C152. Is it

~110mVpp?

o

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Troubleshooting Instructions CCS Technical Documentation

Display faults

Display

faults

Set phone in LOCAL mode.

Start Display test with Phoenix

Try to change

display module.

Is it working now?

Yes

Retest

Are the display

module LED´s

turned ON?

Yes

Display faults 2

o

Measure signal from

X300 pin 10.

Is it 10 – 14V?

Check R306. If OK

measure VBAT from

N300 pin 1.

Is it OK?

Yes

Check LED driver

control signal from

N300 pin 8.

Is it high?

Yes

Check

X300

Yes

Check X300

Check C300 and

VBAT line

o

Check N300, C301, V300,

L300, C302, R318 and

change defect componenet

Check control

signal line. If OK

change UEM.

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Display faults 2

Does the display

start?

Yes

o

Measure

VDD (2.78V) and

VDDI (1.8V).

Are they OK?

Yes

Try to chance the

display module. Is it

working now?

o

Check X300

o

Yes

Retest

Check C305, C306

and lines. If OK,

change UEM.

Measure XRES,

XCS, SI. Are

voltage levels

~1.8V?

o

Check X300 and

lines.

If OK, change UPP.

Yes

END

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Troubleshooting Instructions CCS Technical Documentation

Keypad faults

Keypad

faults

Is the power

key working?

Yes

Measure

voltage from

S336 when

key is pressed.

Is it high?

Measure voltage

from S336. Is it

high?

Yes

Check S336.

Yes

Is it OK?

Check R317,

C311, S336 and

line.

If OK change

UEM.

Yes

Phone

is dead

o

Change S336

Keypad

faults 2

Phone

is

jammed

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CCS Technical Documentation Troubleshooting Instructions

Keypad

faults 2

Are flip T9

keys

working?

o

Check flip poco pins, engine contact pads.

and spring contacts

between A-cover and

engine module. Are

they OK?

Yes

o

Change defected part, either flip or A-cover.

Yes

Change flip. Is it OK

o

Measure Flip VBAT

voltage between J301

and J307 (Should be

same as engine

VBAT voltage).

Yes

Measure voltage

levels from flip data

(J303) and clock

(J305). Is it ~1.8V

Yes

Check with oscilloscope that data is flowing, data shape

and levels are OK.

Yes

Retest

Flip

faults 1

Check R300, R302,

o

Z300, genio17/18 lines

and R319 pull-up to VIO

(~1.8V). If ok change

UPP

Yes

Keypad

faults 3

Retest

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Troubleshooting Instructions CCS Technical Documentation

Keypad faults 3

Check flip poco pins, engine contact pads.

and spring contacts

between A-cover and

engine module. Are

they OK?

o

Change defected part, either flip or A-cover.

Are flip

QWERTY

keys

working?

Yes

o

Yes

Change flip. Is it OK

now?

o

Measure Flip VBAT

voltage between J302

and J308 (Should be

same as engine

VBAT voltage).

Yes

Measure voltage

levels from flip data

(J304) and clock

(J306). Is it ~1.8V

Yes

Retest

Flip

faults 2

Check L310, L312,

R300, R302, Z300,

genio17/18 lines and R319 pull-up to VIO

(~1.8V). If ok change

UPP

Keypad faults 4

Check with oscilloscope that data is flowing, data shape

and levels are OK.

Yes

Retest

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CCS Technical Documentation Troubleshooting Instructions

Keypad

faults 4

Are engine

QWERTY

keys

working?

Yes

Is it a S306 that is

not working (SHIFT

key)

o

Measure voltage of

keypad ROW

where faulty key is

located. Is it ~1.8V

Yes

o

Check switch S306,

R316, Genio 19 line

and VIO voltage at

R316 ~1.8V. OK?

Yes

Change

UPP

Check keypad

switch and lines,

R330, R331, R315.

Are they OK?

Yes

Check switch and lines of

faulty key. If OK change

Z301. If still not OK

change UPP.

o

Change

defect part

o

Change

defect part

Keypad

faults 5

Check keypad COLUMN where faulty key is located. Is there

a pulse sequency every 50ms when

faulty key is pressed

down

Yes

Change

UPP

Check switch and lines of

faulty key. In case of column

4 or 5 check also R330,

R331, R315. If OK change

Z301. If still not OK change

UPP.

Issue 1 04/03 Nokia Corporation Page 75

NSB-9

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No N

N

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N

Troubleshooting Instructions CCS Technical Documentation

Flip faults

1

Check VBAT

voltage from

V320/pin5. Is it OK?

Yes

Check componenets

R326, R327, R301.

Are they OK?

Yes

Check V320

control voltage levels (pin 4). Flip closed -> ~2.75V. Flip open -> ~0V.

OK?

Yes

Change V320 and

retest

o

Check VBAT line, C201, C202.

If not OK, change defect part

and retest

o

Change defect part and retest

Check voltage

N301/pin3. Flip

closed ->

~2.75V. Flip

open -> ~0V.

OK?

Yes

Check line

between

N301/pin3 and

V320/pin5. Is it

OK?

o

Check

voltage

N301/pin1 is

it ~2.75V?

Yes

Check R202 and

KEYB1 line.

Are they OK?

Yes

Change N301 if

not still OK

change UEM

o

Change defect

part and retest.

Check R309,

C309, C205

and VFLASH1

Yes

Check

VFLASH1

voltage is it

~2.75V?

Yes

Change

N301

o

Change

UEM

Change

defect

part

Yes

Retest

Change TB9

module

Page 76 Nokia Corporation Issue 1 04/03

NSB-9

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No N

N

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N

CCS Technical Documentation Troubleshooting Instructions

Flip faults

2

Check VBAT voltage from

V319/pin5. Is it OK?

Yes

Check componenets

R321, R323, R328,

L311, L313 and

lines. Are they OK?

Yes

Check V319

control voltage

levels (pin 4). Flip

closed -> ~0V.

Flip open ->

~2.75V. OK?

Yes

Change V319 and

retest

o

Check VBAT line, C201, C202.

If not OK, change defect part

and retest

o

Change defect part and retest

Check voltage

N301/pin3. Flip

closed ->

~2.75V. Flip

open -> ~0V.

OK?

Yes

Check line

between

N301/pin3 and

UEM KEYB1

line. Is it OK?

o

Check

voltage

N301/pin1 is

it ~2.75V?

Yes

Check R202 and

UEM KEYB1

line. Are they

OK?

Yes

Change N301 if

not still OK

change UEM

o

Change defect

part and retest.

Check R309,

C309, C205

and VFLASH1

Yes

Check

VFLASH1

voltage is it

~2.75V?

Yes

Change

N301

o

Change

defect

part

Change

UEM

Yes

Retest

Change TB9

module

Issue 1 04/03 Nokia Corporation Page 77

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Troubleshooting Instructions CCS Technical Documentation

FM Radio doesn’t work

See page 35, FM Radio troubleshooting.

Page 78 Nokia Corporation Issue 1 04/03

Nokia 6820a Service Manual 08 nsb 9 trouble

Specifications and Main Features

Frequently Asked Questions

User Manual

Troubleshooting Instructions

Table of Contents

RF Troubleshooting

Introduction

EQUIPMENT NEEDED:

USEFUL HINTS

TROUBLESHOOTING IN CASE OF RF TUNING FAIL

Channel Select Filter Calibration

RX Calibration

RX AM Suppression Calibration

RX Band Filter Response Compensation

TX Power Level Tuning

TX IQ Tuning

TX 850 Troubleshooting

Phoenix commands

TX1900 TROUBLESHOOTING

Phoenix commands

RX850 troubleshooting

Phoenix commands

RX1900 Troubleshooting

Phoenix commands

Figures of signals and voltages in testpoints

FM Radio Troubleshooting

Introduction

EQUIPMENT NEEDED

FM RADIO SCHEMATICS

FM Radio layout

REFERENCE MEASUREMENT RESULTS

Baseband Troubleshooting

PWB Test points

Troubleshooting steps

Main troubleshooting tree

Phone is dead

Flash faults

Phone is jammed

Charging fault

SIM card fault

Audio faults

Display faults

Keypad faults

Flip faults

FM Radio doesn’t work