Page 1
CCS Technical Documentation
RH-12/RH-28 Series Transceivers
6(a) - Baseband Troubleshooting
Instructions
Issue 1 02/04 Nokia Corporation
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RH-12/RH-28
Baseband Troubleshooting Instructions CCS Technical Documentation
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CCS Technical Documentation Baseband Troubleshooting Instructions
Table of Contents
Page No
Introduction.................................................................................................................... 5
General Failures ............................................................................................................. 6
Phone is dead ...............................................................................................................6
Flash programming doesn’t work ................................................................................7
Charging Failure ..........................................................................................................8
Phone doesn’t stay on, or phone is jammed ................................................................9
Display Information: “Contact Service” ....................................................................10
Function Failures.......................................................................................................... 12
Camera Failure ...........................................................................................................12
No picture................................................................................................................ 12
Viewfinder working but no picture taken when pressing select-key ...................... 14
FM-radio Failure ........................................................................................................15
Infrared Communication Failure ...............................................................................16
SIM Failure ................................................................................................................17
MMC Failure .............................................................................................................18
Bluetooth Failure .......................................................................................................19
Display Failure ...........................................................................................................20
USB Data Transmission Failure ................................................................................21
Functional Cover Failure ...........................................................................................22
Audio Failure .............................................................................................................24
Uplink or downlink failure...................................................................................... 24
Uplink missing audio signal.................................................................................... 25
Uplink weak audio signal........................................................................................ 26
Uplink distorted audio signal .................................................................................. 27
Uplink TDMA noise................................................................................................ 28
Downlink missing audio signal ............................................................................... 29
Downlink weak audio signal ................................................................................... 30
Downlink distorted audio signal ............................................................................. 31
Downlink noise in audio signal............................................................................... 32
Downlink TDMA noise........................................................................................... 33
Various noise problems........................................................................................... 34
BT audio errors........................................................................................................ 35
Vibra errors ............................................................................................................. 36
BackLight Failure ......................................................................................................37
Key Failure ................................................................................................................38
Power Key Failure................................................................................................... 38
Volume Key Failure ................................................................................................ 39
Keypad Failure ........................................................................................................ 40
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Baseband Troubleshooting Instructions CCS Technical Documentation
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CCS Technical Documentation Baseband Troubleshooting Instructions
Introduction
This document describes in overview the different hardware error possibilities for the
RH-12/RH-28 phone.
Not every possible hardware error is described in this document, but only those possible
to correct.
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Baseband Troubleshooting Instructions CCS Technical Documentation
General Failures
Phone is dead
This means that the phone doesn’t use any current at all when supply is connected and/
or power key is pressed.
It is assumed that the voltage supplied is 3,9Vdc. UEME will prevent any functionality at
battery/supply levels below 2,9Vdc and the software will shut the phone down at 3,1Vdc.
Figure 1: Phone is dead
Phone is dead
Yes
Measure voltage on L260, L261,
L262, L263, L264, L265 and L206.
Should be ~3,9V
Yes
Measure voltages on both sides of
R302 when power key is pressed.
Should be ~0V.
Yes
Sleep clock on J401:
~32,768kHz, 1,8Vpp
Yes
Measure voltage on PURX =
1,8Vdc on J404 or N131 pin 3
~1sec after power key is pressed.
Yes
Measure voltage on VR3=2,78Vdc
on C295 pin1
NO
NO
NO
NO
NO
Failure in VBAT line:
Check X100, L260, L261, L262,
L263, L264, L265, L206, C260,
C261, C262, C283 and pwb
Check:
R302, S323 (power key) and pwb
Check:
B200, C209, C210, D200 and
PWB
Check:
D200 and pwb
Check:
D200, C295 and pwb
Yes
Verify that system clock is @
~26MHz, min 300mVACpp on
C422 pin2 towards D400 (TIKU)
with regular probe Cin ~10-13pF /
10M
Yes
Check:
D400 (TIKU) and D450, D451
(Flashes) and D455 SDRAM
NO
C422, R420, C514, C515, L515,
N500 (Helgo), G501 (26MHZ
Check:
XTAL) and pwb.
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CCS Technical Documentation Baseband Troubleshooting Instructions
Flash programming doesn’t work
The flash programming on RH-12/RH-28 boards is only possible via the pads on the PWB.
In case of Flash failure in production (FLALI station), problem is most likely related to
SMD problems. Possible failures could be Short-circuiting of balls under µBGAs (e.g.
UEME, TIKUEDGE, SDRAM, FLASH), missing or misaligned components.
In flash programming error cases the flash prommer (via Phoenix or Darium) can give
some information about the fault. The fault information messages could be:
• Phone doesn't set Flashbus TXD line high after VCC is switch on.
• External RAM test failed.
These errors are some of the most common errors and based on this, a fault finding diagram for flash programming is shown below. Various errors can appear from the prommer when flashing the phone - not all of them can be directly linked to the HW or phone.
Because of the use of uBGA components, it is not possible to verify on the diagram, if
there is a short circuit in control and address/data lines on TIKUEDGE, NOR flash, NAND
flash or SDRAM.
Re-solder \ Replace componet
Fix the connections if possible.
Else scarp the phone.
Figure 2: Flash programming does not work
Prommer information is:
External RAM test failed. (C108)
No
Check SDRAM orientation and placement.
Placement OK ?
No
Check PWB (if possible) and power lines.
Connecti ons OK ?
Replace the SDRAM
Flash again
Flash programming does not work
Prommer information is:
Phone dose not set Flashbus TXD line hi gh after VCC is switched on.
Yes
Yes
Yes
Yes
Yes
Check J386 - resistor R397/R396
Connecti ons ok ?
Yes
Try reading MCU ID with Phoenix
Reading OK ?
Yes
Try reading flash ID with Phoenix
Reading OK ?
Yes
Flash again
No
Re-solder \ Replace componet
No
Replace UEME or TIKU
No
Replace NOR or NAND flash
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Baseband Troubleshooting Instructions CCS Technical Documentation
Charging Failure
Charging fails and no current
drawn from 'charger'
Yes
Measure Vchar voltage on V101.
Is it > 3,0V?
Yes
Recalibrate charger circuitry and
retest. Did it work ?
Yes
END
Display information when charger
connected: "Not charging"
Yes
Recalibrate charger circuitry and
retest. Did it work ?
NO
Check:
X101, F100, C121, V101, C102,
C103 and PWB
D200 (UEME) is faultyNO
ENDYes
No
Verify through Phoenix that BSI =
~75kOhm (BL-5C) and BTEMP =
~47kOhm @ roomtemperature
(~25C)
Yes
Measure voltage on R200 towards
D200. Should be the same as
Vbat voltage
Yes
Phone should work. If not change
whole engine board
No
No
Check:
BSI: Battery (BL-5C), C100, R203,
pwb and R206
BTEMP: R100, C101, R202, pwb
and R207
Check:
R200, D200 (UEME) and pwb
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CCS Technical Documentation Baseband Troubleshooting Instructions
Phone doesn’t stay on, or phone is jammed
If this kind of a failure is presenting itself immediately after FLALI, it is most likely caused
by ASICs missing contact with PWB.
If the MCU doesn’t service the watchdog register within the UEME, the operations
watchdog will run out after approximately 32 seconds. It is not possible to measure this
service routine.
Figure 3: Phone doesn’t stay on, or is jammed
Phone doesn't stay on or phone is
jammed
Yes
Sleep clock on J401:
~32,768kHz, 1,8Vpp
Yes
Verify that system clock is @
~26MHz, min 300mVACpp on
C422 pin2 towards D400 (TIKU)
with regular probe Cin ~10-13pF /
10M
Yes
Measure voltage on PURX =
1,8Vdc on J404 or N131 pin 3
~1sec after power key is pressed.
Yes
UI functionality and keys react to
pressure
NO
NO
NO
NO
Check:
B200, C209, C210, D200 and
PWB
Check:
C422, R420, C514, C515, L515,
N500 (Helgo), G501 (26MHZ
XTAL) and pwb.
Check:
D200 and pwb
Check:
D400, D450, D451, Z300, Z301,
UI-board, keymat, lightguide and
pwb.
Yes
Is everything working until phone
shuts down after ~32sec
No
Retest and if phone still doesn't
work change whole engine board.
Change D200 (UEME)Yes
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Baseband Troubleshooting Instructions CCS Technical Documentation
Display Information: “Contact Service”
When this error appears in the display it means that one or more of the internal baseband tests has failed. The baseband tests (self tests) are performed each time the phone
is powered on. The self tests are divided into those performed while powering up (Start
up tests) and the ones that can be executed with a PC using Phoenix (Runtime tests). The
following Start-up tests are performed during power up:
UEM CBUS IF TEST
SLEEP X LOOP TEST
AUX DA LOOP TEST
EAR DATA LOOP TEST
TX IDP LOOP TEST
TX IQ DP LOOP TEST
SIM CLK LOOP TEST
SIM IO CTRL LOOP TEST
MBUS RX TX LOOP TEST
BACKUP BATT TEST
RADIO TEST
WARRANTY TEST
PA TEMP TEST
SIM LOCK TEST
PPM VALIDITY TEST
KEYBOARD STUCK TEST
LPRF IF TEST
FLASH CHECKSUM TEST
CAMERA IF TEST
EXT RAM DATA BUS TEST
EXT RAM ADDR BUS TEST
NAND FLASH ID TEST
BT WAKEUP TEST
IR IF_TEST
If all these self tests are passed, the phone will start up.
From Phoenix it’s possible to run all the self tests and the additional “Runtime test”. The
test cases can be seen below.
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CCS Technical Documentation Baseband Troubleshooting Instructions
Figure 4: Display Information: “Contact Service”
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Baseband Troubleshooting Instructions CCS Technical Documentation
Function Failures
Camera Failure
No picture
No picture
Module
placed
correctly?
Yes
1.8V
present at
Z901?
Yes
2.7V
present at
Z900?
Yes
26 Mhz
clock
present at
R900?
Yes
Remove
No No
module
Check for
short circuit of
No No
C903, C902
or C291
Check for
short circuit of
No No
C901, C900
or C289
Check for
No No
short circuit of
R900 or R904
Broken
springs etc.
in X900?
Yes
Change X900
Short
circuits?
Yes
Replace
component
Short
circuits?
Yes
Replace
component
Short
circuits?
Yes
Replace
component
Reposition module
UEME or PWB
FAILURE
UEME or PWB
FAILURE
PWB or TIKU
FAILURE
1.8V
present at
C904
Yes
Continue on
next page
Check for
No No
short circuit of
C904
Short
circuit?
Yes
Replace
component
PWB or TIKU
FAILURE
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CCS Technical Documentation Baseband Troubleshooting Instructions
Data
present at
R913?
Yes
Clock
present at
R906
Yes
Clock
present at
R902?
Yes
Check for
No No
short circuit of
R913
Check for
No No
short circuit of
R906
Check for
No No
short circuit of
R902
Short
circuits
Yes
Replace
component
Short
circuit?
Yes
Replace
component
Short
circuit?
Yes
Replace
component
CAMERA or PWB
FAILURE
CAMERA or PWB
FAILURE
TIKU or PWB
FAILURE
Data
present at
R901?
Check for
No No
short circuit of
R901
Short
circuit?
Yes
Replace
component
TIKU or PWB
FAILURE
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Baseband Troubleshooting Instructions CCS Technical Documentation
Viewfinder working but no picture taken when pressing select-key
Viewfinder working but no picture
taken when pressing select-key
Select key
functional?
Yes
R906 = 104MHz
clock when
pressing select?
Yes
Reflash phone
No
No
Check
keyboard with
Phoenix
Check for
short circuit of
R906
X300 and
X301 OK?
Yes
UI- or main
PWB
FAILURE
Short
circuit?
Replace
component
Yes
No
No
Replace
component
CAMERA
FAILURE
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CCS Technical Documentation Baseband Troubleshooting Instructions
FM-radio Failure
The FM-radio troubleshooting guide is placed in the RF section.
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Infrared Communication Failure
IrDA Failure
Yes
Measure
VBAT at
C350 = 3,7-
4,2V ?
Yes
Measure
VFLASH1 at
C351=2,78V
Yes
Measure VIO
at
C353=1,80V
No
No
No
Defect PWB
Replace
D200
Replace
D200
Yes
Measure
activity TXD
on N350 pin3
?
Yes
Replace N350
No
Replace
D400
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CCS Technical Documentation Baseband Troubleshooting Instructions
SIM Failure
The hardware of the SIM interface from the UEME (D200) to the SIM connector (X386)
can be tested without a SIM card. When the power is switched on, the phone first checks
for a 1,8V SIM card and then a 3V SIM card. The phone will try this four times, whereafter it will display "Insert SIM card".
The error ”SIM card rejected” means that the ATR message received from the SIM card is
corrupted, e.g. data signal levels are wrong. The first data is always ATR and it is sent
from card to phone.
Figure 5: SIM Failure
SIM Fault
Is used sim a
3,0V or 1,8V
card ?
Yes
Measure
VSIM at
X386. Is it 3V
or 1,8V?
Yes
Check SIM power-up
sequence
(picture of 3V sim card)
Should be as
No
Replace used
test sim-card
Check SIM
No No
reader X386
Is not as
picture
picture
Measure
VSIM at
C390. Is it
3V?
Yes
Replace R388
UEME FAILURE
VSIM
Reset
Clock
Data
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Baseband Troubleshooting Instructions CCS Technical Documentation
MMC Failure
The hardware of the MMC interface from the UEME (D200) to the MMC connector
(X910) can’t be tested without a MMC card. To be able to measure the following, solder
wires on respective points.
Figure 6: MMC Failure
MMC Fault
Yes
Measure
VBATBB at
C911 = 3,7-
4,2V ?
Yes
Measure
VMMC at
C913=2,85
V
Yes
Measure
VMMC at
X910 pin4
=2,85V
No
No
Defect PWB
The following points can be
measured at phone
powerup, since the MMC
will be initialized here.
Replace
N910
No
Resolder
X910
Yes
Measure
MMC_CMD &
MMC_CLK
activity on X910
pin 2&5
Yes
Reflash phone
No
Replace
R910
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CCS Technical Documentation Baseband Troubleshooting Instructions
Bluetooth Failure
The Bluetooth troubleshooting guide is placed in the RF section.
When the flash D450 or UEME has been replaced the IMEI has to be reprogrammed. This
will automatically include reprogramming of the BT address.
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Baseband Troubleshooting Instructions CCS Technical Documentation
Display Failure
Display fails
Yes
Is display working
Yes
NO
Yes
Change display
module
Is display
working?
NO
Measure Vflash1 @
L302 towards X302
(display connector).
Should be ~2,78Vdc
Yes
Measure VIO @ L301
towards X302 (display
connector). Should be
~1,8Vdc
Yes
Are LED's working?
Measure Vout on
C304 = ~13,5V
NO
NO
NO
X302, C311, L302, C310,
Check:
D200 (UEME) and PWB
Check:
X302, C309, L301, C308,
R307, D200 (UEME) and
PWB
Check:
N300, C304, R308, R312,
R306, X302, R305, X300, pwb
and UI board
End
Yes
Measure RESX on
X302 - pin 24. Should
be ~1,8V.
Yes
Phone should work. If
not change engine
board.
NO
Check:
D400 (TIKU) and pwb
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CCS Technical Documentation Baseband Troubleshooting Instructions
USB Data Transmission Failure
USB failing
Attach phone via DKU-2
cable. Display shows: 'Data
enhancement connected' ?
No
Measure Vbus @
C109
Is it ~5 V?
Yes
Measure startup sequence for:
,D+,D- @ C109,J105,J106
V
bus
Compare to screenshot
Yes
No
Similar startup sequence
USB host detected.
Retest USB interface
Check Pop Port X102
(soldering joints & spring
contacts) or Z101, R106 &
R108
Retest USB interface
Check USB2 ASIP
R107,Z101,R106,R108
Retest USB interface
Fail
Measure startup sequence for:
Vbus,D+,D- @ C109,J110,J109
(1,8 V logic levels)
Compare to screenshot
Fail
Change TikuEdge
Similar startup sequence
Ch.1: D+, Ch.2: D-, Ch.3: V
Change NUT N100.
Retest USB interface
bus
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Baseband Troubleshooting Instructions CCS Technical Documentation
Functional Cover Failure
FCI failing
Fail
Attach FC to phone.
Open CCS Phoenix
tool. Run 'alive' test
Fail
Check 'Padextender'
(Solder joints and spring
contacts). Is it okay?
Yes
Attach FC to phone.
Measure V
Is it ~V
out
?
bat
Okay
No
No
FCI is working.
Retest phone
Change the
'padextender'.
Retest interface
Change
L304,C320. Is it
working now?
Retest interfaceYes
No
Change Z310. Is it
working now?
Yes
No
TikuEdge interface
failing.
Goto FCI failing
page 2
Retest interfaceYes
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FCI failing
page 2
Attach FC to phone.
Measure SCL & SDA
Can any activity be
seen?
Yes
No
Change
L305,L306. Is it
working now?
No
Change Z310. Is it
working now?
No
TikuEdge interface
failing.
Retest interfaceYes
Retest interfaceYes
Attach FC to phone.
Measure Int High to low
transition?
Yes
No
Change L307. Is it
working now?
No
Change Z310. Is it
working now?
No
TikuEdge interface
failing.
Retest interfaceYes
Retest interfaceYes
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Baseband Troubleshooting Instructions CCS Technical Documentation
Audio Failure
Uplink or downlink failure
Start
Is there an
audio
signal?
Yes
Is audio
level
sufficient?
Yes
Is audio
signal
undistorted?
Yes
Is TDMA
noise
inaudible
uplink
No
No
No
No
missing audio
Go to "Uplink
signal"
Go to "Uplink
weak audio
signal
Go to "Uplink
distorted
audio signal"
Go to "Uplink
TDMA noise"
Is problem
uplink or
downlink
Is there an
audio
signal?
Yes
Is audio
level
sufficient?
Yes
Is audio
signal
undistorted?
Yes
Is audio
signal free
of noise
downlink
No
No
No
No
Go to
"Downlink
audio signal
missing"
Go to
"Downlink
audio signal
weak"
Go to
"Downlink
audio signal
distorted"
Go to
"Downlink
audio signal
noise"
Yes
Is there no
acoustical
feedback
No
Go to
"Acoustical
feedback"
Yes
Is TDMA
noise
inaudible
Yes
Is there no
acoustical
feedback
Yes
Click noise, audio
signal too loud or
bad picture/
sound
synchronization
No
No
No
Go to
"Downlink
TDMA noise"
Go to
"Acoustical
feedback"
Software
error or bad
TIKU
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Uplink missing audio signal
Start
No
Is mute
deactivated?
Is problem
present both with
hand portable
and accessory?
Is problem
solved when
using
accessory?
Yes
Measure
mic. bias. Is
it close to
2.1 V ?
Yes
No
No
No
Deactive
mute in menu
Accessory is
defective
Are any of the bias
components defective ?
(check R153, C151 and
R151 for hand portable
and R156, C158, R166,
C159 and L152 for
No
Replace
UEME
accessory)
Replace
defective parts.
Is bias close to
2.1 V ?
Yes
Are microphone
contacts and
PWB pads ok ?
Yes
Replace
microphone
No
Yes
No
Clean
contacts and
pads
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Uplink weak audio signal
Start
Is
microphone
opening
clean?
Yes
Measure
bias. Is it
close to
2.1V?
Yes
No
No
Clean
opening
Are any of the bias
components
defective (check
R153, C151 and
R151)
Yes
Replace
defective parts.
Is bias close to
2.1 V
Yes
No
Replace
UEME
No
Are microphone
contacts and
PWB pads ok?
Yes
Are any of the
components L151,
C165, R155, R162
or R157 missing or
damaged?
Replace
microphone
Clean contacts and pads. If
No
tracks are badly corroded it
may not be possible to
repair phone
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Uplink distorted audio signal
Start
Is there no
distortion when
using
accessory?
Yes
Measure
bias. Is it
close to
2.1V?
Yes
No
No
Are any of the bias
defective (check
R153, C151 and
defective parts.
Is bias close to
Defect
accessory
components
R151)
Replace
2.1 V
No
Replace
UEME
No
Yes
Are microphone
contacts and
PWB pads ok
Yes
Replace
microphone
Clean contacts and pads. If
No
tracks are badly corroded it
may not be possible to
repair phone
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Uplink TDMA noise
Start
Is there TDMA
noise both in hand
portable and when
using accessory?
Yes
Replace
microphone. Is
there still noise?
Yes
Check for loose,
missing or damaged
shielding cans
No
No
Is there only
noise in hand
portable
mode?
Yes
Defective
microphone
No
Defective
accessory
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Downlink missing audio signal
Start
Is problem present
both in hand
portable mode and
when using FM
radio/music player/
MIDI?
Yes
Is problem
present both in
earpiece, IHF
and with
accessory?
Yes
No
No
earpiece, IHF or
associated with
Is problem
related to
accessory?
Is problem
FM radio or
music player/
MIDI?
FM
radio
Is external
antenna
working?
Yes
No
IHF
Music
player/MIDI
Defective
music file
Accessory is
not detected
or is defective
FM module is
defective
IHF is defective.
Check IHF speaker
and connections.
Check L155, L156
and C162.
Check UEME.
Earpiec
e
Accessory
Earpiece is
defective. Check
IHF speaker and
connections. Check
L155, L156 and
C162.
Check UEME.
Accessory is
defective
Software or
UEME is
defective
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Downlink weak audio signal
Start
Is problem
present both in
earpiece and
IHF?
Yes
No
Is problem
related to
earpiece or IHF?
Earpiec
e
Is IHF
opening
clogged?
No
IHF
Is IHF
opening
clogged?
Yes
Yes
IHF is defective.
Check UEME.
Clean
opening
Check IHF
speaker and
connections.
Clean
earpiece
opening
IHF
No
Earpiece is
defective. Check
earpiece speaker
and connections.
Check UEME.
Software or
UEME is
defective
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Downlink distorted audio signal
Start
Is problem
present both in
earpiece and
IHF?
Yes
No
Is problem
related to
earpiece or IHF?
Earpiec
e
IHF
IHF is defective.
Check IHF
speaker and
connections.
Check UEME.
Earpiece is
defective. Check
earpiece speaker
and connections.
Check UEME.
Software error.
Bad music files.
Defective FM
module.
Defective UEME
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Downlink noise in audio signal
Start
Is noise
electrical or
mechanical?
Electrical
Is noise
associated with
earpiece/IHF
(hand portable
mode)?
No
Is noise
associated with
FM tuner or with
Music Player?
Mechanical
Yes
Music Player
Loose speaker or
other component
inside telephone
No
Does error
occur both in
earpiece and
IHF?
Yes
Defective
speaker.
Software error.
Defective or badly
tuned antenna.
Bad music file
FM radio
Is noise
associated with
accessory?
Yes
No
Defective FM
module
Defective
accessory. Repair
or Replace
accessory
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Downlink TDMA noise
Start
Is there TDMA
noise both in hand
portable and when
using accessory?
Yes
Replace battery.
Is there still
noise?
Yes
No
No
Is there only
noise in hand
portable
mode?
Yes
Defective
battery.
Check for loose,
missing or damaged
shielding cans.
Mistuned antenna.
Missing/bad
components.
Check that problem is
not related to uplink
TDMA noise.
No
Defective
accessory
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Various noise problems
Start
Sound
level too
loud?
No
Click noise
No
Picture/sound
synchronisation
Yes
Yes
Yes
Software
error
Software
error
Bad TIKU
Page 34 Nokia Corporation Issue 1 02/04
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BT audio errors
Start
Accessory
working?
Yes
Software
working?
Yes
Defective BT
module or antenna.
Defective TIKU
No
No
Replace or
repair
accessory
Flash with
new software
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Vibra errors
Start
Wrong setting or
software error.
Contact problem.
No
Is there any
vibration?
Yes
Mechanical problem
- counterweight is
blocked
Defective or missing
vibra.
Defective UEME.
Is there
sufficient
vibration?
Yes
Vibra is
constantly
switched
on?
No
Intermittent
vibration?
No
Acoustical
noise?
No
Yes
Yes
Yes
Software error
Contact problem.
Defective vibra.
Defective UEME.
Software error.
Defective UEME.
Short circuit.
Bad connection.
Defective vibra.
Defective vibra.
Mechanical problem
- counterweight hits
D-cover/PWB.
Loose parts in
phone.
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BackLight Failure
Start
Are the display LED's
working?
Yes
Are the keyboard LED's
working?
Try to change display.
Are the LED's working
now?
Yes
Check X302 (Solder joints).
No No
Is it OK?
Yes
Measure VLED+ ~ 13.5V
when the LED driver is
enabled. Is this OK?
Change UI PWB. Are the
LED's working now?
No
No
No
Retest failed display
Change X302
Check N300, L303, C304,
C304, R308. If not OK,
Change defect part.
Retest the failed UI PWB
Yes
Yes
End
Check X301 (Solder joints).
Is it OK?
Yes
Measure VLED+ ~ 8V when
the LED driver is enabled.
Is this OK?
Yes
Retest
No
No
Change X301
Check R304, R303 & all
LED's on UI PWB. If not
OK, Change defect part.
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Key Failure
Power Key Failure
Keypad fault
Power key Ok
?
No
Measure voltage
from S323. Is it
high?
Yes
Measure voltage
from S323 when
pressed. Is it high?
No
No
Yes
Check
R302,C302,S323
and line. If Okay
UEME failure
Check S323. Is it
Okay?
No
Change S323Phone is jammed
Yes
Phone is dead
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Volume Key Failure
Volume Up key
working?
Measure Row4
line from S320 Is it
~1,8 V?
Yes
Measure Col1 from
S320 when pressed. Is
there a 50 u pulse?
No
No
Check S320 and Row4
line. If Ok, change Z300. If
it still fails, change
TikuEdge
Check S320 and Col1 line.
If Ok, change Z300. If it
still fails, change TikuEdge
Change TikuEdgeYes
Volume Down
key working?
Measure Row4
line from S321 Is it
~1,8 V?
Yes
Measure Col2 from
S321 when pressed. Is
there a 50 u pulse?
No
No
Check S321 and Row4
line. If Ok, change Z300. If
it still fails, change
TikuEdge
Check S321 and Col2 line.
If Ok, change Z300. If it
still fails, change TikuEdge
Change TikuEdgeYes
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UI module keys working
UI-module
keys working
Try to change UI
No
PWB. Are the
keys working now
Check X300 & X301
(Soldering and spring
contacts). Is it okay?
Measure Row0-Row4,
UP, DOWN and SELECT
lines from X301. Are
voltage levels ~1,8 V?
?
No
Yes
Yes
Yes
No
Retest UI module
Change X300 and/
or X301
No
Yes
End
Measure SleepX
signal (J403), when key is
pressed. Is voltage level
~1,8 V?
Yes
When keypad is
pressed, are the
LED's lit?
No
Illumination fault
No
Check lines Row0-Row4,
UP, DOWN,and SELECT
from X300.
If Ok, change Z300 and/or
Z301. If it still fails, change
TikuEdge
Page 40 Nokia Corporation Issue 1 02/04
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