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1255 Technical TrainingBaseband Troubleshooting
Presentation
NMP-CDMA; San DiegoJan, 2006
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Disclaimer
Materials current at time of publish and based upon most current R&D Documentation. Please refer to the latest product TB to determine further handset hardware variations if any.
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Introduction
The mobile terminal uses a CDMA single mode engine (Cellular/ 800) with Qualcomm baseband consisting of following ASICs:
• Power Management IC,PM6610(PM) • Mobile Station Modem processor,MSM6000(MSM)• RFT6122 and RFR6122 are RF transmitter and
receiver IC• 32MB Flash memory with 8MB of pSRAM memory
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Functionality Block Diagram
PM6610
Flash Memory & LCDRFR6122
RFT6122
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Power Distribution Block Diagram
PM6610
VREG_RFTX
VREG_TCXO
RFT6122
VREG_MSMP
VREG_RFRX
VREG_MSMA
VREG_MSMC
Duplexer
VREG_RUIM
BATTERY3.7V
MSM6000
RFR6122
PA
Power Detector
KEYPAD
MEMORY
LCD MODULE
MIC
VCTCXO
MICBIAS
LED
HEADSET MIC
AUDIO PA
DC JACK5V
PNP
VIBRATOR
PA TRANSISTOR
RUIM
VPH_PWR
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PWB Bottom Side
Power management IC
RF transmitter
TX saw filter
power amplifier
cell duplexer
RF receiver
RX saw filter
MSM 6000 Flash IC
19.2MHz TCXO
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PWB Overview - Top
LCD_SER_A0
LCD_SER_CS_N
Antenna connector
LCD_SER_DATA
LCD_SER_CLK
Display connector
LCM LEDs
REC_P
REC_N
Keypad LEDs
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Based on the common Qualcomm engine, the major components are:
• Power Management -• MSM6000-Mobile Station Modern• Memory– 32Megabit Flash+8Megabit
SRAM• Audio – Earpiece, microphone, speaker• Display – 96x65 dot matrix FSTN LCD
module• User interfaces
KeypadRUIMAccessory – headset, charger, data
cables etc…
BB7.0 In Detail
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Subsystems within the MSM6000 device include a CDMA processor, a DFM processor, QCT’s QDSP2000™ DSP for voice compression,PLL and an ARM® ARM7TDMI microprocessor. Also integrated in the MSM6000 device are an audio voice codec and analog interfaces for the radioOne RF ASICs.Controllers for an R-UIM, GPIOs, and peripheral interfaces complete the system integration.
MSM6000 Solution General Features• RadioOne™ Zero Intermediate Frequency (ZIF)/Direct Conversion Architecture• CDMA2000 1x Release 0• Supports IS-95-A and IS-95-B compliant CDMA and AMPS subscriber units• Voice Centric (EVRC 8 kbps)• 8x Searcher, plus an independently controlled 16x Searcher• 2-way Short Message Service (SMS)•Supports peak rates of 14.4 kpbs packet data in forward and reverse links simultaneously
Mobile Station Modem
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The PM6610 IC controls the power distribution to the whole mobile terminal through the baseband and RF regulators excluding the power amplifier (RF PA), which has a continuous power rail directly from the battery. The battery feeds power directly to the following parts of the system:
• PM6610
• RF PA
• Vibrator
• Keyboard & LCD backlights
• Audio Amplifier
Universal Energy Management
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The main clock signal for the baseband is generated from the voltage and temperature controlled crystal oscillator VCTCXO. This 19.2 MHz clock signal is generated at the RF and fed to TCXO_IN.
RF Clock – Analog/Digital
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The UPP distributes a 19.2MHz Clock signal to the internal processors, the DSP and MCU, where SW multiplies this clock by seven for the DSP and by two for the MCU.
RF Converter Clk
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The 32.768 kHz crystal oscillator is the primary SLEEP clock source, when TCXO clocks are disabled to conserve power. The 32.768 kHz crystal oscillator signal is generated by an external crystal (plus two shunt capacitors) that supplemented by a PM internal inverter and buffer.
Sleep Clock
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A 9.6 MHz clock signal is used for SBI, which is used by the MSM to transfer data between the PMIC and MSM6000.
The system clock is stopped during sleep mode by disabling the VREG_TCXO. The TCXO is turned off by the PMIC regulator which is from MSM’s TCXO_EN output signal.
Serial Bus Interface (SBI) Clock
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Troubleshooting
First, carry out a through visual check of the module. Ensure in particular that:
• There are no mechanical damages
• Soldered joints are okay
• ASIC orientations are okay
Troubleshooting instructions are divided into the following sections:
• "Mobile Terminal is Totally Dead"
• "Flash Programming Does Not Work"
• "Power Does Not Stay on or the Mobile Terminal is Jammed"
• "Charger Faults"
• "Audio Faults"
• "Display Faults"
• "Keypad Faults"
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Mobile is dead
Is the mobile terminal current is zero or too
high?
Is the currentU<U 60 mA?
Check RESIN_N signals. Is it high (2.8V)?
Reflow orchange
MSM6000
Reflow/ change PM6610.
Is flashprogramming OK?
Check PS_HOLD signals. Is it high (2.9V)?
Reflow orchange
MSM6000
Reflow orchangePM6610
YES
NO
Check the “BSI” line atJ700, C714, R709.
Are they OK?
YES YES
YES
NO
NO
YES
NO
Mobile Terminal is
Dead
Mobile Terminal is
Jammed
FlashFaults
♦If current is zero, check L101, Q700, R710 and check the power on sequence. If there is no power output, reflow or change PM6610.♦If current is too high, check for shorts.♦Make sure all BB regulators are at their respective voltage levels (VREG_MSMA, VREG_MSMP, VREG_MSMC, VREG_TCXO). Reflow/ change PM6610 if necessary.
NO NO
YES
Check ROM_CS_N (TP423). Is it toggling after
RESIN_N goes high?YES
NO
Reflow orchange
the memory IC
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Current Limitations
Regulator MaximumCurrent
(mA)
Vout
(V)
Notes
VREG_MSMC 150 2.75 Enabled always except during power-off mode
VREG_MSMP 150 2.95 Enabled always except during power-off mode
VREG_MSMA 150 2.6 Enabled only when the system is powered on (Off during sleep and power-off modes)
VREG_TCXO 50 2.85 Enabled only when the system is powered on (Off during sleep and power-off modes)
VREG_RUIM 150 3.0 Enabled only when RUIM card is used
VREG_RFRX 150 2.65 Enabled when the receiver is on
VREG_RFTX 150 2.65 Enabled when the transmitter is on
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Current Test Points
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Current @ Zero/Too High?
1.) Measure BB regulator voltage levels: VREG_MSMC – 2.75V, VREG_MSMP – 2.95V, VREG_MSMA – 2.6V, VREG_TCXO – 2.85V
2.) Voltage here should be the same as the one from power supply
3.) Voltage here should be 3.3V ~ 4.2V
RESIN_N
PS_HOLD
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Start-up Sequence
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Start-up Timing (1/2)
13ms<TRESET1<30ms
VREG_TCXO
RESIN_N
PS_HOLD
PWR_ON_SENSE_N
TREG1 < 10ms
VREG_MSMA
VREG_TCXO
PWR_ON_SENSE_N
VREG_MSMP
VREG_MSMC
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Start-up Timing (2/2)
TPSHOLD<133ms
VREG_TCXO
RESIN_N
PS_HOLD
PWR_ON_SENSE_N
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The BSI Line
If all of the above checks pass, then check whether terminal jammed or if flash faults exist.
1.) BSI Line @ J700
2.) BSI Line @ C714
3.) BSI Line @ R709
4.) VREG_TCXO – 2.85V
Note: The BSI line must < 1.8V for proper operation
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RXD = Data to Phone
TXD = Data to PC
VREG_MSMP = 2.95V
When flash programming, the Flash Adatper uses the above signals to connect to the Phone. All logic voltage levels are 2.95V. Power is supplied to the phone using the battery contacts.
Flash Interface/Signals
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Flash Faults FlashFaults
Measure 19.2MHz RF CLK at testpoint. Is it OK? NO
Measure the 19.2MHz CLK coming from the TCXO. Is it
OK?NO
Check/ change VREG_TCXO, Y702, R703, C704, C724, R714, C712, C722, R704, R413, and
C403
YES
YES Reflow or change MSM6000
Can the mobile terminal connect to PC via UART? NO
YES
Mobile Terminal is Jammed
Reflow or change the memory IC
Reflow or change the memory IC.Is it work?
NO
YES
ENDYES
Check ROM_CS_N (TP423) and WR_N (TP429). Are they
toggling during programming?
NO Reflow or change MSM6000
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Flash…
19.2MHz System Clock
VREG_TCXO – 2.85V
ROM_CS_N
WR_N
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Jammed TerminalMobile
Terminal is Jammed
Measure VREG_MSMP, VREG_MSMC,
VREG_MSMA, and VREG_TCXO voltages. Are
they OK?
NO
Check VPH_PWR, VREG_MSMP, VREG_MSMC, VREG_MSMA, and
VREG_TCXO capacitors. Are they OK?NO
Repair capacitors, reflow/ change TCXO/
PM6610
YES
YESCheck “BSI” line and
VPH_PWR line. Are they OK?
NO Reflow or changePM6610
YES
Measure 32kHz Sleep CLK from testpoint. Is it OK? NO Measure the 32 kHz clock
crystal. Is it OK?NO Change Y700
YES
YES Reflow or change PM6610
Measure 19.2MHz RF CLK at testpoint. Is it
OK?
NOMeasure the 19.2MHz CLK coming from the
TCXO. Is it OK?NO
Check/ reflow/ change VREG_TCXO, Y702,
R703, C704, C724, R714, C712, C722, R704, R413,
and C403YES
YES Reflow or change MSM6000
Measure RESIN_N. Is it high (2.8V)?
NO Reflow or change PM6610
YES
Change MSM6000
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Jammed Terminal
1.) Measure BB regulator voltage levels: VREG_MSMC – 2.75V, VREG_MSMP – 2.95V, VREG_MSMA – 2.6V, VREG_TCXO – 2.85V
VPH_PWR, it should be 3.3V ~ 4.2V
BSI Line @ J700 BSI Line @
C714
BSI Line @ R709
3.) Measure 19.2MHzSystem Clock output
2.) Measure 32kHzSleep Clock output
4.) Measure RESIN_N. Is it high (2.8V)
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Charging Circuitry
The PM6610 IC charge control is dependent on the charger type and the battery size. The charger’s DC input is through the dc-jack connector. This phone supports AC-3/AC-4 & DC-4 chargers.
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Charging Circuitry
Connecting a charger, it creates a voltage on the VCHG input of the PM6610. Charging starts when the PM6610 detects the VCHG input voltage level above 3.3V. The algorithm basically consists of the following three steps:
• Check that the system current (the collector current of PNP transistor) is within safety limits (<0.6A).
• Check the power consumption of PNP transistor is within safety limits (<1W).
• Check that the charger is within the charger window (voltage and current).
If the charger is accepted and identified, the appropriate charging algorithm is initiated.
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Battery Circuit
The 1255 uses a Lithium-Ion cell battery. MSM6000 reads the resistor inside the battery pack on the BSI line to identify the battery size. Different charging algorithm will be used for different battery sizes. The resistors is connected to the BSI pin inside the battery connector.
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Charger Faults ChargerFaults
Connect the charger and make sure the battery is
connected.
Check the “BSI” line. Is it about 75k Ohm or 81k
Ohm?
NOCheck/ change DC jack,
C714, C709 and VREG_TCXO.
YES
Measure voltage at D1006.
Is it >4.5V?
NOCheck/ change DC jack, L101,
D1006, C1030, R700, C717 and Q700.
YES
Read MOBILE TERMINAL_THERM value.
Is it room temperature?NO Check NTC R606 and
R605. Are they OK?NO Replace NTC
or R605
YES YES
Measure voltage between pin#1 and pin#3 of Q700. Is it
>0.7V
NO
Reflow or change MSM6000
YES
Change Q700
Check R708.Is it OK?
NO Reflow/ change R708
YES
Reflow or change PM 6610
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Charger Faults
1.) Check the “BSI” line of battery. Is it about 75K Ohm or 81k Ohm to GND?
2.) Measure voltage at D1006. Is it > 4.5V
VREG_TCXO, it should be 2.85V
Check NTC (R606) and R605 Are they OK?
3.) Read PHONE_THERM value. Is it about the room temperature?
1
3
4.) Measure voltage between pin#1 and pin#3 of Q700. Is it > 0.7V
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The audio control and processing is provided by the MSM which contains the audio codec, the MCU and DSP block. These blocks handle and process the audio data signals. The baseband supports two microphone inputs and three receiver/ speaker outputs.
The two microphone inputs: MIC1+ & MIC1- : input of 1255 schematic are used for the mobile terminal’s internal microphone.JACK_MIC+ & JACK_MIC- : input are used for headsets.
Every microphone input can have either a differential or single-ended AC connection to MSM circuit: The internal microphone (MIC1+) andexternal headset microphone (JACK_MIC) are both differential signal which come from different sources and are connected to separate inputs at the MSM.
The MICBIAS output is used for MIC1 to provide 1 mA of current at 1.8 Volts DC. VDD_MSMP (2.85V) regulated voltage from PMIC is used for JACK_MIC (external headset).
Audio Control
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Audio Faults
Retest
AudioFaults 1
Is the onboard receiver working?
Replace the receiver. Is it
working now?
Use CCS SoftwareTestingStereo
Audio/VibraReceiver Mobile terminal Receiver Loop Back Test
command
Is the signal coming out of the MSM6000
on EAR10+ and EAR10- ?
Change the receiver.
NO
Check/ change C506, C507, c508. If OK, change the
MSM6000 .
Audio Faults Page 2
YES
YES
YES
NO
NO
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Is Audio signal present at EAR10+ & EAR10-?
If ok, replace the earpiece.
If not ok, check c506,c507,c508,d501,d502 component.
C508C506 C507
Audio Faults
D501
D502
EAR10+
EAR10-
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Audio Faults 2 AudioFaults 2
Is onboard microphone working?
Replace the microphone. Is it
working now?Retest
Audio Faults Page 3
Measure MICBIAS voltage from MIC1+ pads. Is it 1.6V~ 1.95V?
Check/ change R500,C528. If OK, change MSM6000.
Check/ change C509, C510, R501 If OK, change MSM6000.Is the signal going to the MSM6000 at
MIC1+ and MIC1- at C503?
NO YES
NOYES
NO
YES
NO
YES
Retest
Use CCS SoftwareTesting Stereo Audio/Vibra
MicrophoneMobile terminal Microphone Test command
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1.) Does MICN @ MICP read ~1.95v?
If not, check: R500, R501.
If ok, go to step 2.
2.) Is signal going to UPP @ MICP and MICN @GM500
If not, check connections at: R500, R509,R510,R501, C503, C509, C510, and C528,D504,D503.
If ok, change Microphone.
Audio Faults 2
MICN
MICP
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Audio Faults 3 AudioFaults
3
Check/ change R1029,R1030,R1031,R1032.,R501 If OK, change
MSM6000.
Audio Faults Page
4
Select a ring tone and measure signals at L1003 and L1004. Are the signals OK?
Change IHF
Measure FF_SPKR_EN. Is it OK (2.9V)? And U1001
Vcc = VPH_PWR
ChangeMSM 6000 and
PM6610
Use CCS SoftwareTesting Stereo Audio/Vibra
SpeakerMobile terminal Speaker control Test command
Is the internal handsfree speaker
(IHF) working?NO
YES
NO
YES
NO
NO
YES
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L1003
L1004
1.) Check L1003 & L1004.
If not ok, go to step 2.
If ok, change IHF.
3.)Use SoftwareTesting Stereo Audio/Vibra SpeakerMobile terminal Speaker control Test command
If not, check or change R1029,R1030,R1031,R1032,R501.
If OK, change MSM6000.
Audio Faults 3
R1029
R1030
R1031
R1032
R501
2.) Measure 2.9V @ FF_SPKR_EN and U1001=VPH_PWR.
If ok, go to step 3.
If not ok, change MSM6000 and PM6610.
U1001
FF_SPKR_EN
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Audio Faults 4 AudioFaults 4
Is the vibrator working?
Measure VBATT voltage pin 1 on the vibrator. Is it
OK?
Check VPH_PWR line. Is it OK?
Reflow/ change battery, CR700,
C726
END
Use CCS SoftwareTesting Stereo Audio/Vibra
Vibrator Control Test Command vibrator should work.
Measure the PM 6610 signal on
pin 2 on the vibrator. Is the
signal OK?
Change the vibrator
Change the PM 6610, CR700, C726
NO
YES
NO
NO
YES
NO
YES
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1.) Measure PM6610 signal at Vibra Pin 2.
If not ok, replace PM6610.
3.) Measure VPH_PWR voltage at Vibrator(Vibra).
If not ok, check VPH_PWR line. If ok, change PM6610.
If not, repair.
2.) Via the User’s menu, test a vibrator to determine Vibra functionality.
4.) Replace Vibra.
Audio Faults 4
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Display Faults
Measure battery voltage at DNI700 pin1. Is it okay?
Check/ change battery and
VPH_PWR line
Measure the voltage at Q1_pin2. Is it change to low?
Measure the driver signal at Q1_pin1. Is
the signal okay?
Replace Q1
Check R206, R207. Does the voltage across resistor is
okay?
Check LEDs DS200 and DS201. Are they
okay?
Check resistor soldering / Replace
R206, R207
Reflow/ change any bad component DS200, DS201
Retest
Do the keyboard LEDs turned on when the mobile terminal is
turned on or when making a call?
DisplayFaults 2
DisplayFaults
Reflow/ change MSM6000
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
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Q1
R207
DS200
C2404
4.) Check LEDs DS200 and DS201
If ok, retest again
If not ok, reflow/change DS200, DS201.
2.) Measure driver signal @ Q1
If ok, go to step 3.
If not, reflow/change MSM6000.
DNI700
1.) Measure battery voltage @ DNI700.
If ok, go to step 2.
If not, check/change battery and VPH_PWR line.
3.) Check the voltage @ R206,R207.
If ok, go to step 4.
If not ok, soldering/change R206, R207
DS201
R206
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Display Faults 2
Check LCD supply voltage at J401 pin9. Is it okay?
Change PM6610
Check LCD signals: LCD_SER_CLK(J401_pin4),
LCD_SER_DATA(J401_pin5), LCD_SER_A0(J401_pin6),
LCD_SER_CS_N(J401_pin7). Are the signals okay?
Change LCD module
Does the display start?
DisplayFaults Page2
Check/ change MSM6000
END
NO
YES
NO
YES
NO
YES
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LED Driver
The mobile terminal uses light-emitting diodes (LEDs) for liquid crystal display (LCD) and keypad illumination. There is two white LEDs for the LCD and six LEDs for the keypad. BACKLIGHT is the signal used to drive the LED driver for the LCD and keyboard.
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Signals and levels:
• LCD bus : LCD_SER_CLK, LCD_SER_DATA, LCD_SER_A0, LCD_SER_CS_N
• VREG_MSMP : 2.95v for LCD digital logic
• RSOUT_N : for LCD reset
LCD Interface
The mobile terminal uses a monochromatic LCD. The interface uses a serial bus to transfer the Command/ Data between MSM and LCD.The panel for 1255 is a 96x65 dot matrix FSTN LCD module. It has a FSTN panel composed of 96 segments and 65 commons. The LCD interface uses 4-lines for controlled Command/ Data with 9-bit data.
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Keypad Faults 1
NO
YES
KeypadFaults
Is the power key working?
Measure voltage atSw9 PIN2 (2.8V).
Is it high?
Change the PM6610
Measure voltage at SW9 when power key is pressed. Is it Low?
Retest
Keypad Faults Page 2
Change the PM6610
NO
YES
NO
YES
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2.) Is UEM Pin8 Voltage Low when Power key depressed?
If ok, see Mobile Terminal is Dead troubleshooting.
If not ok, check SW9 line.
Keypad Faults 1
1.) Is UEM Pin8 Voltage high?
If ok, go to step 2.
If not, check:
UEM VDD Voltage
If ok, replace UEM.
If not, check VPH_PWR Voltage.
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Keypad Faults 2
NO
Keypad Faults Page
2
Are the UI module keys working?
NOChange keypad module.
Is it working? YES Retest
YES
Measure KEYSENSE(1~4)_N signals between MSM6000 and keypad at every
outer dome key. Are they ~2.9V? NO
Make sure there are no shorts on KEYSENSE(1~4)_N. If OK, change MSM6000.
Otherwise, remove the short.
YES
END
Measure KYPD_(9,11,15,13) signals between MSM6000 and
keypad on every inner dome Key. Are they about 0V?
NO
Make sure there are no shorts on KYPD_(9,11,15,13). If OK, change
MSM6000. Otherwise, remove the short.
YES
Change the MSM6000
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1.) Measure signals KEYSENSE(1~4)_N between the UPP any keypad @ every dome key. Do they read ~2.9V?
If not, make sure there are no shorts . If ok, replace UPP.
2.) Measure signals KYPD_(9,11,13,15)between the UPP and keypad @ every dome key. Do they read ~0V?
If not, make sure there are no shorts . If ok, replace UPP.
Keypad Faults 2
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The 1255 supports following accessories.
Pop-port bottom connector pin out . The pin out on the 1255 connector is as follows: • DC Charger Input Blue • Headset Jack Input Green • Mic Input Purple You can perform the following in 1255 accessories: • Charging • Audio interface headset mic and receiver
Accessory Detection
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Headset Detection
The phone support Nokia standard 2.5mm mono headset. The headset insertion to the phone is detected through pin 3 (HS_DET) of the headset Jack, J1001. HS_DET (“JACK_SENSE” pin in 1255 schematic) is low when headset not inserted. It becomes high when headset is inserted.
Headset Detection Circuit
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The 1255 Series phone supports UIM. Use the waveform in the Figure to verify that:
UIM_DATA,
UIM_CLK,
UIM_REST, and
VREG_RUIM signals are activated in the correct sequence at power up.
This image may be observed when the UIM is installed on the phone and functioning normally.
SIM Interface/Signals
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Questions??? Thank You for your attention!
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