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CCS Technical Documentation RH-12/RH-28 Series Transceivers
6(a) - Baseband Troubleshooting Instructions
Issue 1 02/04
Nokia Corporation
RH-12/RH-28 Baseband Troubleshooting Instructions
CCS Technical Documentation
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CCS Technical Documentation Table of Contents
RH-12/RH-28 Baseband Troubleshooting Instructions
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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RH-12/RH-28 Baseband Troubleshooting Instructions
CCS Technical Documentation
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CCS Technical Documentation
RH-12/RH-28 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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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 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 Check: C422, R420, C514, C515, L515, N500 (Helgo), G501 (26MHZ XTAL) and pwb. Check: D200, C295 and pwb Check: D200 and pwb NO Check: B200, C209, C210, D200 and PWB Check: R302, S323 (power key) and pwb Failure in VBAT line: Check X100, L260, L261, L262, L263, L264, L265, L206, C260, C261, C262, C283 and pwb
NO
NO
NO
NO
NO
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RH-12/RH-28 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.
Figure 2: Flash programming does not work
Flash programming does not work
Prommer information is: External RAM test failed. (C108) Yes No Check SDRAM orientation and placement. Placement OK ? Yes Fix the connections if possible. Else scarp the phone. No Check PWB (if possible) and power lines. Connections OK ? Yes Replace the SDRAM
Prommer information is: Phone dose not set Flashbus TXD line high after VCC is switched on. Yes Check J386 - resistor R397/R396 Connections ok ? Yes Try reading MCU ID with Phoenix Reading OK ? Yes Try reading flash ID with Phoenix Reading OK ? Yes Flash again No No No
Re-solder \ Replace componet
Re-solder \ Replace componet
Replace UEME or TIKU
Replace NOR or NAND flash
Yes Flash again
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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 NO D200 (UEME) is faulty Check: X101, F100, C121, V101, C102, C103 and PWB
NO
Display information when charger connected: "Not charging" Yes Recalibrate charger circuitry and retest. Did it work ? 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 Check: R200, D200 (UEME) and pwb Check: BSI: Battery (BL-5C), C100, R203, pwb and R206 BTEMP: R100, C101, R202, pwb and R207
Yes
END
No
No
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RH-12/RH-28 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 Yes Is everything working until phone shuts down after ~32sec No Retest and if phone still doesn't work change whole engine board. Check: D400, D450, D451, Z300, Z301, UI-board, keymat, lightguide and pwb. Check: D200 and pwb Check: C422, R420, C514, C515, L515, N500 (Helgo), G501 (26MHZ XTAL) and pwb. NO Check: B200, C209, C210, D200 and PWB
NO
NO
NO
Yes
Change D200 (UEME)
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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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RH-12/RH-28 Baseband Troubleshooting Instructions
Figure 4: Display Information: "Contact Service"
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RH-12/RH-28 Baseband Troubleshooting Instructions
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Function Failures
Camera Failure
No picture
No picture
Module placed correctly?
No
Remove module
Broken springs etc. in X900?
No
Reposition module
Yes
Yes Change X900
1.8V present at Z901?
No
Check for short circuit of C903, C902 or C291
Short circuits?
No
UEME or PWB FAILURE
Yes
Yes Replace component
2.7V present at Z900?
No
Check for short circuit of C901, C900 or C289
Short circuits?
No
UEME or PWB FAILURE
Yes
Yes Replace component
26 Mhz clock present at R900? Yes
No
Check for short circuit of R900 or R904
Short circuits?
No
PWB or TIKU FAILURE
Yes Replace component
1.8V present at C904
No
Check for short circuit of C904
Short circuit?
No
PWB or TIKU FAILURE
Yes
Yes Replace component
Continue on next page
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RH-12/RH-28 Baseband Troubleshooting Instructions
Data present at R913?
No
Check for short circuit of R913
Short circuits
No
CAMERA or PWB FAILURE
Yes
Yes Replace component
Clock present at R906
No
Check for short circuit of R906
Short circuit?
No
CAMERA or PWB FAILURE
Yes
Yes Replace component
Clock present at R902?
No
Check for short circuit of R902
Short circuit?
No
TIKU or PWB FAILURE
Yes
Yes Replace component
Data present at R901?
No
Check for short circuit of R901
Short circuit?
No
TIKU or PWB FAILURE
Yes Replace component
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RH-12/RH-28 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?
No
Check keyboard with Phoenix
X300 and X301 OK?
No
Replace component
Yes Yes UI- or main PWB FAILURE
R906 = 104MHz clock when pressing select?
No
Check for short circuit of R906
Short circuit?
No
CAMERA FAILURE
Yes
Yes Replace component
Reflash phone
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RH-12/RH-28 Baseband Troubleshooting Instructions
FM-radio Failure
The FM-radio troubleshooting guide is placed in the RF section.
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RH-12/RH-28 Baseband Troubleshooting Instructions
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Infrared Communication Failure
IrDA Failure Yes
Measure VBAT at C350 = 3,74,2V ? Yes
No Defect PWB
Measure VFLASH1 at C351=2,78V
No
Replace D200
Yes
Measure VIO at C353=1,80V
No
Replace D200
Yes
Measure activity TXD on N350 pin3 ?
No
Replace D400
Yes Replace N350
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RH-12/RH-28 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
No
Replace used test sim-card
Measure VSIM at X386. Is it 3V or 1,8V?
No
Check SIM reader X386
Measure VSIM at C390. Is it 3V? Yes
No
UEME FAILURE
Yes Check SIM power-up sequence (picture of 3V sim card) Should be as picture
Is not as picture
Replace R388
VSIM
Reset
Clock
Data
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RH-12/RH-28 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 = 3,74,2V ?
No
Defect PWB
Yes
The following points can be measured at phone powerup, since the MMC will be initialized here.
Measure VMMC at C913=2,85 V Yes
No
Replace N910
Measure VMMC at X910 pin4 =2,85V Yes
No
Resolder X910
Measure MMC_CMD & MMC_CLK activity on X910 pin 2&5
No
Replace R910
Yes Reflash phone
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RH-12/RH-28 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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Display Failure
Display fails Yes Is display working NO Change display module
Is display working? Yes
NO
Measure Vflash1 @ L302 towards X302 (display connector). Should be ~2,78Vdc Yes Measure VIO @ L301 towards X302 (display connector). Should be ~1,8Vdc
NO
Check: X302, C311, L302, C310, D200 (UEME) and PWB
NO
Check: X302, C309, L301, C308, R307, D200 (UEME) and PWB
Yes
Yes Are LED's working? Measure Vout on C304 = ~13,5V Yes Measure RESX on X302 - pin 24. Should be ~1,8V. Yes Phone should work. If not change engine board. Check: D400 (TIKU) and pwb Check: N300, C304, R308, R312, R306, X302, R305, X300, pwb and UI board
NO
NO
End
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USB Data Transmission Failure
USB failing
Attach phone via DKU-2 cable. Display shows: 'Data enhancement connected' ?
Yes
USB host detected. Retest USB interface
No
Measure Vbus @ C109 Is it ~5 V?
No
Check Pop Port X102 (soldering joints & spring contacts) or Z101, R106 & R108 Retest USB interface
Yes
Measure startup sequence for: Vbus,D+,D- @ C109,J105,J106 Compare to screenshot
Similar startup sequence
Check USB2 ASIP R107,Z101,R106,R108 Retest USB interface
Fail
Ch.1: D+, Ch.2: D-, Ch.3: Vbus
Measure startup sequence for: Vbus,D+,D- @ C109,J110,J109 (1,8 V logic levels) Compare to screenshot
Similar startup sequence
Change NUT N100. Retest USB interface
Fail
Change TikuEdge
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Functional Cover Failure
FCI failing
Fail
Attach FC to phone. Open CCS Phoenix tool. Run 'alive' test
Okay
FCI is working. Retest phone
Fail
Check 'Padextender' (Solder joints and spring contacts). Is it okay?
No
Change the 'padextender'. Retest interface
Yes
Attach FC to phone. Measure Vout Is it ~Vbat ?
No
Change L304,C320. Is it working now?
Yes
Retest interface
No
Change Z310. Is it working now?
Yes
Retest interface
Yes No
TikuEdge interface failing.
Goto FCI failing page 2
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FCI failing page 2
Attach FC to phone. Measure SCL & SDA Can any activity be seen?
No
Change L305,L306. Is it working now?
Yes
Retest interface
No
Change Z310. Is it working now?
Yes
Retest interface
Yes
No
TikuEdge interface failing.
Attach FC to phone. Measure Int High to low transition?
No
Change L307. Is it working now?
Yes
Retest interface
No
Yes
Change Z310. Is it working now?
Yes
Retest interface
No
TikuEdge interface failing.
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RH-12/RH-28 Baseband Troubleshooting Instructions
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Audio Failure
Uplink or downlink failure
Start
uplink
Is problem uplink or downlink
downlink
Is there an audio signal?
No
Go to "Uplink missing audio signal"
Is there an audio signal?
No
Go to "Downlink audio signal missing"
Yes Yes Is audio level sufficient? No Go to "Uplink weak audio signal Is audio level sufficient? Yes Yes Is audio signal undistorted? Go to "Uplink distorted audio signal" Is audio signal undistorted? Yes Yes Is TDMA noise inaudible No Is audio signal free of noise No Go to "Downlink audio signal noise" No Go to "Downlink audio signal distorted" No Go to "Downlink audio signal weak"
No
Go to "Uplink TDMA noise"
Yes
Yes
Is there no acoustical feedback
No
Go to "Acoustical feedback"
Is TDMA noise inaudible
No
Go to "Downlink TDMA noise"
Yes Go to "Acoustical feedback"
Is there no acoustical feedback Yes
No
No Click noise, audio signal too loud or bad picture/ sound synchronization Software error or bad TIKU
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RH-12/RH-28 Baseband Troubleshooting Instructions
Start
Is mute deactivated?
No
Deactive mute in menu
No
Is problem present both with hand portable and accessory?
Yes
Is problem solved when using accessory?
No
Accessory is defective
Yes No Are any of the bias components defective ? (check R153, C151 and R151 for hand portable and R156, C158, R166, C159 and L152 for accessory) No Replace UEME
Measure mic. bias. Is it close to 2.1 V ?
Yes
Replace defective parts. Is bias close to 2.1 V ?
No
Yes
Are microphone contacts and PWB pads ok ?
No
Clean contacts and pads
Yes Replace microphone
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RH-12/RH-28 Baseband Troubleshooting Instructions Uplink weak audio signal
CCS Technical Documentation
Start
Is microphone opening clean?
No Clean opening
Yes
Measure bias. Is it close to 2.1V?
No
Are any of the bias components defective (check R153, C151 and R151)
No
Replace UEME
Yes
Yes
Replace defective parts. Is bias close to 2.1 V
No
Yes
Are microphone contacts and PWB pads ok?
No
Clean contacts and pads. If tracks are badly corroded it may not be possible to repair phone
Yes
Are any of the components L151, C165, R155, R162 or R157 missing or damaged?
Replace microphone
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CCS Technical Documentation Uplink distorted audio signal
RH-12/RH-28 Baseband Troubleshooting Instructions
Start
Is there no distortion when using accessory?
No Defect accessory
Yes
Measure bias. Is it close to 2.1V? Yes
No
Are any of the bias components defective (check R153, C151 and R151)
No
Replace UEME
Replace defective parts. Is bias close to 2.1 V
No
Yes
Are microphone contacts and PWB pads ok
No
Clean contacts and pads. If tracks are badly corroded it may not be possible to repair phone
Yes
Replace microphone
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RH-12/RH-28 Baseband Troubleshooting Instructions Uplink TDMA noise
CCS Technical Documentation
Start
Is there TDMA noise both in hand portable and when using accessory?
No
Is there only noise in hand portable mode?
No
Defective accessory
Yes
Yes
Replace microphone. Is there still noise?
No
Defective microphone
Yes
Check for loose, missing or damaged shielding cans
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CCS Technical Documentation Downlink missing audio signal
RH-12/RH-28 Baseband Troubleshooting Instructions
Start
Is problem present both in hand portable mode and when using FM radio/music player/ MIDI?
No
Is problem associated with FM radio or music player/ MIDI? FM radio
Music player/MIDI Defective music file
Yes
Is external antenna working? Is problem present both in earpiece, IHF and with accessory? No Yes
No
Accessory is not detected or is defective
FM module is defective
Yes Is problem related to earpiece, IHF or accessory? IHF IHF is defective. Check IHF speaker and connections. Check L155, L156 and C162. Check UEME. Earpiece is defective. Check IHF speaker and connections. Check L155, L156 and C162. Check UEME.
Earpiec e
Accessory
Accessory is defective
Software or UEME is defective
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RH-12/RH-28 Baseband Troubleshooting Instructions Downlink weak audio signal
CCS Technical Documentation
Start
Is IHF opening clogged? Is problem present both in earpiece and IHF? No No
Yes
Clean IHF opening
Yes
Is problem related to earpiece or IHF?
IHF
IHF is defective. Check IHF speaker and connections. Check UEME.
Earpiec e Is IHF opening clogged? No Earpiece is defective. Check earpiece speaker and connections. Check UEME. Yes Clean earpiece opening
Software or UEME is defective
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CCS Technical Documentation Downlink distorted audio signal
RH-12/RH-28 Baseband Troubleshooting Instructions
Start
Is problem present both in earpiece and IHF?
No
Yes
Is problem related to earpiece or IHF?
IHF
IHF is defective. Check IHF speaker and connections. Check UEME.
Earpiec e
Earpiece is defective. Check earpiece speaker and connections. Check UEME.
Software error. Bad music files. Defective FM module. Defective UEME
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RH-12/RH-28 Baseband Troubleshooting Instructions Downlink noise in audio signal
CCS Technical Documentation
Start
Is noise electrical or mechanical?
Mechanical
Loose speaker or other component inside telephone
Electrical
Defective speaker. No
Is noise associated with earpiece/IHF (hand portable mode)?
Yes
Does error occur both in earpiece and IHF?
No
Yes
Software error. Defective or badly tuned antenna.
Is noise associated with FM tuner or with Music Player?
Music Player Bad music file
FM radio
Is noise associated with accessory?
No Defective FM module
Yes
Defective accessory. Repair or Replace accessory
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CCS Technical Documentation Downlink TDMA noise
RH-12/RH-28 Baseband Troubleshooting Instructions
Start
Is there TDMA noise both in hand portable and when using accessory?
No
Is there only noise in hand portable mode?
No
Defective accessory
Yes
Yes
Replace battery. Is there still noise?
No
Defective battery.
Yes
Check for loose, missing or damaged shielding cans. Mistuned antenna. Missing/bad components. Check that problem is not related to uplink TDMA noise.
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RH-12/RH-28 Baseband Troubleshooting Instructions Various noise problems
CCS Technical Documentation
Start
Sound level too loud? No
Yes
Software error
Click noise
Yes
Software error
No
Picture/sound synchronisation
Yes Bad TIKU
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RH-12/RH-28 Baseband Troubleshooting Instructions
Start
Accessory working?
No
Replace or repair accessory
Yes
Software working?
No
Flash with new software
Yes
Defective BT module or antenna. Defective TIKU
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RH-12/RH-28 Baseband Troubleshooting Instructions Vibra errors
CCS Technical Documentation
Start
Is there any vibration?
No
Yes
Wrong setting or software error. Contact problem. Mechanical problem - counterweight is blocked Defective or missing vibra. Defective UEME.
Is there sufficient vibration? Yes
No
Software error Contact problem. Defective vibra. Defective UEME.
Vibra is constantly switched on? No
Yes
Software error. Defective UEME. Short circuit.
Intermittent vibration?
Yes
Bad connection. Defective vibra.
No Acoustical noise? Yes
Defective vibra. Mechanical problem - counterweight hits D-cover/PWB. Loose parts in phone.
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RH-12/RH-28 Baseband Troubleshooting Instructions
BackLight Failure
Start
Are the display LED's working?
Try to change display. Are the LED's working now?
No
Retest failed display
Yes
Check X302 (Solder joints). Is it OK?
No
Change X302
Yes
Yes
Measure VLED+ ~ 13.5V when the LED driver is enabled. Is this OK?
No
Check N300, L303, C304, C304, R308. If not OK, Change defect part.
Are the keyboard LED's working?
No
Change UI PWB. Are the LED's working now?
No
Retest the failed UI PWB
Yes
Check X301 (Solder joints). Is it OK?
No
Change X301
Yes
Yes
Measure VLED+ ~ 8V when the LED driver is enabled. Is this OK?
No
Check R304, R303 & all LED's on UI PWB. If not OK, Change defect part.
Yes
End
Retest
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Key Failure
Power Key Failure
Keypad fault
Power key Ok ?
No
Measure voltage from S323. Is it high?
No
Check R302,C302,S323 and line. If Okay UEME failure
Yes
Measure voltage from S323 when pressed. Is it high?
Yes
Check S323. Is it Okay?
Yes
Phone is dead
No No
Phone is jammed
Change S323
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RH-12/RH-28 Baseband Troubleshooting Instructions
Volume Up key working?
Measure Row4 line from S320 Is it ~1,8 V?
No
Check S320 and Row4 line. If Ok, change Z300. If it still fails, change TikuEdge
Yes
Measure Col1 from S320 when pressed. Is there a 50 u pulse?
No
Check S320 and Col1 line. If Ok, change Z300. If it still fails, change TikuEdge
Yes
Change TikuEdge
Volume Down key working?
Measure Row4 line from S321 Is it ~1,8 V?
No
Check S321 and Row4 line. If Ok, change Z300. If it still fails, change TikuEdge
Yes
Measure Col2 from S321 when pressed. Is there a 50 u pulse?
No
Check S321 and Col2 line. If Ok, change Z300. If it still fails, change TikuEdge
Yes
Change TikuEdge
Issue 1 02/04
Nokia Corporation
Page 39
RH-12/RH-28 Baseband Troubleshooting Instructions UI module keys working
Try to change UI PWB. Are the keys working now ?
CCS Technical Documentation
UI-module keys working
No
Yes
Retest UI module
No
Check X300 & X301 (Soldering and spring contacts). Is it okay? Yes
No
Change X300 and/ or X301
Measure Row0-Row4, UP, DOWN and SELECT lines from X301. Are voltage levels ~1,8 V?
No
Yes Yes Measure SleepX signal (J403), when key is pressed. Is voltage level ~1,8 V? Check lines Row0-Row4, UP, DOWN,and SELECT from X300. If Ok, change Z300 and/or Z301. If it still fails, change TikuEdge
No
Yes
When keypad is pressed, are the LED's lit?
No
End
Illumination fault
Page 40
Nokia Corporation
Issue 1 02/04