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Ringo 3
Baseband Block 02
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CELLULAR PHONE 00
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Circuit Diagram of Module UIF
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Circuit Diagram of System Blocks
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General Information 01
22 pgs195.23 Kb0
Installation Guide 64
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Non Serviceable Accessories 08
16 pgs110.18 Kb0
SERVICE SOFTWARE INSTRUCTIONS 05
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Service Tools 07
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Transceiver Variants 04
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Troubleshooting Instructions 06
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Nokia Ringo 3 Troubleshooting Instructions 06

Download
PAMS Technical Documentation
NHX–7 Series Transceiver
Chapter 6
Troubleshooting
Instructions
Original 10/98
NHX–7
PAMS
Troubleshooting Instructions
AMENDMENT RECORD SHEET
Amendment Number
Date Inserted By Comments
Page NS–2
Original 10/98
PAMS
NHX–7
Troubleshooting Instructions

CONTENTS

Introduction NS–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction NS–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Fault NS–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver Fault NS–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter Fault NS–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UI Module Fault NS–9–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Call Set–up Fault NS–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page No
Original 10/98
Page NS–3
NHX–7
PAMS
Troubleshooting Instructions
TROUBLESHOOTING
The purpose of the 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 by as sim­ple measurements 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, you have to go the subbranch.
Required servicing equipment: – PC for Service Software – Power supply (2.0A) – Digital multimeter – Oscilloscope – Signal generator
– Spectrum analyzer – RF cables – Service cables – RF–adapter AAT–7X – Test jig JSU–7 – RS232/MBUS adapter
Page NS–4
Original 10/98
PAMS
NHX–7

Introduction

The General Troubleshooting chart defines the most likely fault catego­ries.
START
Will turn into local mode ?
Receiver OK ? (SINAD OK)
Troubleshooting Instructions
Logic fault
OK
FAIL
Receiver fault
OK
Transmitter operating (RF power OK) ?
OK
Earphone level/
modulation (nom, max)
OK
Is display/keypad module working ?
OK
FAIL
FAIL
FAIL
Transmitter fault
Earphone level or modulation fault
Display or keypad fault
Original 10/98
END
OK
FAIL
Call set–up faultCall set–up ?
Page NS–5
NHX–7
PAMS
Troubleshooting Instructions
Logic Fault
Logic fault
Power drops off or does not assume local mode
OK
Check clock signal
of CLKMCU ~2.8 Vpp
OK
XRES ~ 0 V
OK
FAIL
FAIL
Check MBUS connection d.c. voltages; – D201/9 TXD – D201/10 RXD – X103/11 M2BUS
Above lines are
2,8 V all the time.
VL, and VA
2,8V only
momentarily on
OK
FAIL
Voltages always 2,8 V
OK
Check; – solderings of PSA N101
– loading of supply voltages
– if OK, change N101
– Check load on VL
and VA lines
Check d.c. voltages of N101; – pin 20 1.845 V if VBAT ~4.1 V – pin 1, 5, 22 ~VBAT
Check; – D201 pins 51 (CLKMCU),
21 and 53 67 and 68, 12, 30, 50 and 58 (GND)
– XPWROFF line load
– If OK, change D201
N101/23 XPWROFF line
at least 1 microsec. pulse to 2,8 V
3 sec. intervals (momentarily)
OK
FAIL FAIL
N101/22 PWRONX
line 0 V pulse (momentarily)
Check; – PWR button – UI connector
contacts
Page NS–6
Original 10/98
PAMS
7
NHX–7
Receiver Fault
Receiver fault
Simplex sens.
(TX off)
OK
FAIL
See earphone level fault
AF signal at
N370/9 (DAF) OK?
OK
FAIL
Troubleshooting Instructions
VRX
OK?
OK
FAIL
Check:
N101/4
TX spectrum
OK
Replace duplex filter Z660
FAIL
Transmitter fault
RX–VCO
oscillating
OK
VCO–freq
OK
FAIL
Check: operating voltage of G530
Check: resistance through N820/3, R521, R522, R523
voltage N820/4,14
FAIL
Connections of R530, C532 VCTCXO operating voltage
and frequency = 14.85 MHz. Check SCLK, SDAT and SLE
lines.
RXINJ
OK at V341 collector
FAIL
OK
at N370/16
FAIL
IF level
after Z350
FAIL
Check: solderings of Z660, Z321, Z350 operation of V320
1. IF
OK?
OK
Check: voltage of N370/4, components C378, R371,C37
Z370, L370, if OK replace N370
OK
Check operation of V380
Check: RXINJ level at V341 collector (5–10 dBm), V341
operating voltage and bias, C341
Original 10/98
Page NS–7
NHX–7
x
PAMS
Troubleshooting Instructions
Transmitter Fault
Check: resistance through N820/17,R421, R422, R423
Transmitter fault
Transmitter frequency
OK
OK
590<Pout<980 mW
(level 0,1,2) 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 V430
output freq. and
spectrum OK (TXE OFF)
OK
Buffer V440
output freq. and
spectrum OK
(TXE ON)
FAIL
FAIL
Check: V430 operating voltage and bias, C440 R440, C443, C444, C442 R444
Check: V440 operating voltage and bias, C450, R455, C454, TXE,
C451, C604
OK
Check Z660 TX–pin soldering. If OK replace Z660
Check: R647, V642,R660 C643, VTX, TXE, TXC
R641, R655, V650, V641, V640, V651
FAIL
FAIL
Vpc N601/8
1.8 – 3.5V (level 0,1,2)
OK
TXINJ level
6–12 dBm at
N601/5
FAIL
OK
OK
N601 freq. and spectrum OK when duplex filt.
not connected
FAIL
Check: C631, C641, C660, C642, C634, C635, C608, C625, C602, C633, C601 If OK, replace N601
OK
Check soldering of duple filter Z660. If OK replace filter.
Replace G430
Page NS–8
FAIL
VCO output
level –3...+3 dBm
OK
Check operation of V430 and V440
Original 10/98
PAMS
NHX–7
Audio Fault
EARPHONE LEVEL / MODULATION LEVEL FAULT SIGNAL LEVELS OF AUDIO CIRCUiT N701
MIC
PIN 46 XMIC
MICAM
50 mVrms
TXMUX+TXAAF
TXATT
MICTRI
ATTO
TXBP
ATTO COMI COMO EMPI EMPO LPIN
COMI
PIN 47 PIN 49 PIN 50 PIN 51 PIN 52 PIN 53
COMPR
COMO
EMPI
50 mVrms 50 mVrms 70 mVrms 70 mVrms 95 mVrms 95 mVrms
Troubleshooting Instructions
EMPO LPIN
LIM1 LIM2
PREEM TXLP
WTRFIL+WPOSFIL
TXTRI+TXPOSTFIL
SUM
MOD PIN 55
170 mVrms
Signal levels are measured by oscilloscope and input signal frequency is 1 kHz. Transmitted signal deviation is 2.3 kHz.
HF CONTROL
VOLI
VOL
RXATT
FILO EXPI EAMPBO EWCI PIN 31 100 mVrms EXPO VOLI EARP EARM XEAR PIN 35 130 mVrms
PIN 27 DAF
RXTRI
125 mVrms
RXAAF EXP
RXMUX+AAFIL
DEEMP+RXFIL
EAMPBO
FILOEXPI
EXPO
EAR
ACC
PIN 28 PIN 29 PIN 30
PIN 32 PIN 34 PIN 38 PIN 37
EARP EARM
EVGND
XEAR
180 mVrms 180 mVrms 100 mVrms
330 mVrms 330 mVrms 120 mVrms 120 mVrms
Signal levels are measured by oscilloscope. Received signal audio frequency is 1 kHz, deviation 5.7 kHz and power level –53dBm.
Original 10/98
Page NS–9
NHX–7
PAMS
Troubleshooting Instructions
UI Module Fault
The UIM can be repaired in service. Use nominal supply and signal val­ues when UIM is under test.

General UI Troubleshooting

What is the
problem?
Start
Mechanical
?
Audio
Troubleshooting
Troubleshooting
Keyboard
Audio
Other
?
Other
?
Other
The problem is not on UIM
A
Is the problem corrected?
?
A
Yes
Display
BacklightingKeyboard
No
Mechanical
Troubleshooting
Display
Troubleshooting
Backlight
Troubleshooting
Replace the UIM with new one. Test does it works. If not then the problem can not be on UIM.
Page NS–10
End
Original 10/98
PAMS
NHX–7

Mechanical Troubleshooting

In mechanical failures it better to replace whole unit or module than try to fix it in service. This kind of module is LCD module which is better to re­place with new one when mechanical error is occurred.
What is the
problem?
Springs of the earpiece or the support ring is damaged
Replace the Earpiece or support ring
Replace the UI Module
Start
?
PCB is damaged
Troubleshooting Instructions
Display is cracked or other part of the LCD module is damaged
Replace the LCD Module
Update Ser­vice Data­base
End
Original 10/98
Page NS–11
NHX–7
PAMS
Troubleshooting Instructions

Audio Troubleshooting

Earpiece
Can the control sig­nal to be measured from earpiece con­necting pads. See schematic..
YesNo
?
Problem might be some randomize behavior or unclean contacts on UIM. Check if resistors (R950,R951,R952) or ferrites (Z1, Z2) are dam­aged. Clean contacts or replace with new UIM.
Buzzer might be dam­aged. Replace the buzz­er and test again
Earpiece is damaged. Replace it and test again.
Can signal be measure from R903, V902
Yes
Is V902 OK?
Yes No
?
V902 is damaged. Re­place it and test again.
Start
What is the
problem?
?
No
?
V901 is damaged. Re­place it and test again.
Buzzer
Can Battery Voltage be measured from connection point of R904, V904 and positive pin of B904. See schematic.
Yes
Can the control sig­nal to be measured from V901, R901, R902
Yes No
Problem is not on UIM.
?
Can the control signal be measured from b–t–b on mother board
No
No
?
Can the battery voltage be measured from b–t–b on mother board
Yes
?
Yes
?
Problem might be some randomize behavior or unclean contacts on UIM. Clean contacts or replace with new UIM.
Problem is not on UIM.
No
Page NS–12
Update Ser­vice Database
End
Original 10/98
PAMS
NHX–7

Display Troubleshooting

Display shown unexpected characters
Is display soldered properly on its place
YesNo
?
Solder display back its place and test again. If it still not work correctly re­place it with new one and try again.
Start
What is the
problem?
?
Display does not work
Can Vout signal be measured from C910. See sche­matic.
Yes No
Is display soldered properly on its place
Yes
?
Troubleshooting Instructions
No
?
Solder display back its place and test again. If it still not work correctly re­place it with new one and try again.
Can the logic voltage to be measured from b–t–b on mother board
Display driver might be damaged. Replace the LCD module and test again.
Problem might be some randomize behavior or unclean contacts on UIM. Clean contacts or replace with new UIM.
Can the control sig­nal to be measured from connecting pads of display
?
Can the control signal be measured from b–t–b on mother board
NoYes
NoYes
?
A
Update Ser­vice Database
End
Yes
Problem might be some randomize behavior or unclean contacts on UIM. Clean contacts or replace with new UIM.
A
Problem is not on UIM.
No
?

Keyboard Troubleshooting

If the scanning signal can not be measured from UIM measure it from board to board connector on mother board. If scanning can be measured from connector, clean contacts and if that not help then replace UIM. See schematic.
Original 10/98
Page NS–13
NHX–7
PAMS
Troubleshooting Instructions

Backlight Troubleshooting

If one or more of LEDs are dim then replace LED itself. If the keyboard or LCD LEDs are dim please check if the control signal can be measured from R920 or R932. If control signal is on but battery voltage is missing from LED, check if that is missing from board to board connector. If the control signal or the battery voltage can not be measured from the con­nector the problem is not on UIM, otherwise replace UIM and test again. See schematic.

Module Repairing at Service

UIM can be repaired at service but LCD module should not be repaired. It is better to replace whole LCD module than just try to replace one part of it because LCD cell or some other parts might be also damaged.
Page NS–14
Original 10/98
PAMS
NHX–7
Call Set–up Fault
Call set–up fault
Phone will not assume SERV – mode
OK
Subscriber data OK ?
FAIL
Troubleshooting Instructions
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.
Original 10/98
D0000123
Page NS–15
NHX–7
PAMS
Troubleshooting Instructions
This page intentionally left blank.
Page NS–16
Original 10/98
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