Samsung SCH-N500 Скачать руководство пользователя страница 36

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Flow Chart of Troubleshooting

SAMSUNG Proprietary-Contents may change without notice

7-8

This Document can not be used without Samsung's authorization

7-1-4 Abnormal Key tone,voice / melody

Abnormal Key tone,voice / melody, ring tone

Key tone,Voice

problem?

Yes

Waveform

exist

@C153,C155

Check U100

Waveform

exist

@U104

pinA2,C2 ?

Check U450 and its

neighboring circuits

Normal

sound ?

Check speaker

connection.

Replace if required

Yes

Is Key press

sensed?

Replace Key

Dome sheet

or Check dust

Yes

END

Waveform

exist

@U105
pin2,6 ?

Check U105 and its

neighboring circuits

Yes

Waveform

exist

@C151,C152

Check U100

Yes

Abnormal Key tone,voice / melody, ring tone

Key tone,Voice

problem?

Yes

Waveform

exist

@C139,C142

Check U100

Waveform

exist

@U103

pin6,10 ?

Check U103 and its

neighboring circuits

Normal

sound ?

Check speaker

connection.

Replace if required

Yes

Is Key press

sensed?

Replace Key

Dome sheet

or Check dust

Yes

END

Waveform

exist

@U105
pin2,6 ?

Check U105 and its

neighboring circuits

Yes

Waveform

exist

@C113,C114

Check U100

Yes

Содержание SCH-N500

Страница 1: ... N500 1 General Introduction 2 Specification 3 Installation 4 Product Support Tools 5 Circuit Description 6 Test Procedure 7 Flow Chart of Troubleshooting 8 Electrical Parts List 9 Exploded Views and Parts List 10 Block Diagram 11 PCB Diagrams ...

Страница 2: ...Ltd Setember 2005 Printed in Korea Code No GH68 08423A BASIC This Service Manual is a property of Samsung Electronics Co Ltd Any unauthorized use of Manual can be punished under applicable International and or domestic law ⓒ ...

Страница 3: ...he Subscriber Unit shall be Single band in compliance with TSB 74 TIA EIA IS 125 Recommended Minimum Performance standards for Digital Cellular Wideband Spread Spectrum Speech Service Option1 TIA EIA IS 126 A Mobile Station Loop back Service Option standard TIA EIA IS 95B Mobile Station Base Station Compatibility Standard for Dual Mode Wideband Spread Spectrum Cellular Systems for the analog air i...

Страница 4: ...SAMSUNG Proprietary Contents may change without notice General Introduction 1 2 This Document can not be used without Samsung s authorization ...

Страница 5: ...l Bandwidth Channel Spacing Number of Channel Duplex Separation Type of Emission In Output Impedance Tx Local Freq Rx Local Freq TCXO freq Freq Stability Operating Temperature 824 64 848 87MHz 869 64 893 37MHz 1 23MHz 30KHz 20FA 45MHz 1M25F9W 50 Ohm 1649 28 1696 74MHz 1739 28 1786 74MHz 19 2MHz FRX 45MHz 300Hz 30deg 60deg Supply Voltage Size and Weight 3 6V STD 57 0 X 37 0 X 5 1mm 20g 800 mAh ...

Страница 6: ...Hz Channel Spacing 30kHz Number of Channels 20FA Duplex Separation 45 MHz Type of Emission 1M25F9W Input Output Impedance 50 ohms Local Frequency Transmitter 1649 28 1696 74MHz Receiver 1739 28 1786 7MHz TCXO Frequency 19 2MHz Frequency Stability FRX 45MHz 300Hz Operation Temperature 30 C 60 C Supply Voltage 3 6V TRANSMITTER Waveform Quality 0 944 or more Open Loop Power Control Range 25dBm 57 5dB...

Страница 7: ...c Range 104dBm FER 0 5 or less 25dBm FER 0 5 or less Conducted Spurious Emission 869 894 MHz 81dBm 824 849 MHz 61dBm All Other Frequencies 47dBm Single Tone Desensitization lower than 1 Rx power level 101dBm Tone power level 30dBm Tone offset from carrier 900KHz Intermodulation Spurious Response Attenuation lower than 1 Tone 1 offset from carrier 900KHz Tone 2 offset from carrier 1 700MHz Test 1 2...

Страница 8: ... Nxxxxx SX Pxxx RSSI ECIO Wxx CxxxxR xx SI0 T xx SID SXXXX NID NXXXX Call Processing State SX 1 S1 Init State 2 S2 Idle State 3 S3 VC Init State 4 S4 WFO State 5 S5 WFA State 6 S6 Call State 7 S7 Release State 8 S8 OVHD State 9 S9 Originate State 10 SA Page Res State 11 SB ORD Res State 12 SC Reg State 13 SD MSG State Pilot PN Code RSSI ECIO ECIO Walsh Code Channel Number Protocol Revision Slot Cy...

Страница 9: ...emoving the Battery To install insert the battery into the opening on the back of the phone making sure the plastic tabs on the back are inserted into the matching slots in the phone Press down until the latchsnaps into place To remove make sure the power is off Push the battery release latch up completely Pull and lift the battery away from the phone ...

Страница 10: ...SAMSUNG Proprietary Contents may change without notice Installation This Document can not be used without Samsung s authorization 3 2 ...

Страница 11: ...00 XP EQUIPMENT REQUIRED Make sure you have the following equipment setup 1 Minimum PC configuration 586 CPU 64MB RAM Windows2000 XP 5MB of disk space free for software upgrade 2 PST Software with appropriate cable UART Cable for SAMSUNG phone 3 UART Port 4 Power Supply 3 8 V or Battery INSTALLATION Software 1 Insert the SCH N500 CD ROM into your CD Rom drive 2 Run the file explorer and run the Se...

Страница 12: ...ocedure Service Programming setting correct com port Read Data from File Click Open mmc icon to select the name of a file whose extension is mmc The values will be read from the named file and will initialize the parameter values seen on the Service programming screen Read Data from Phone Click Read from the Phone icon to upload the current programmable parameters of the phone The values are read ...

Страница 13: ...e phone may take up to a minute If there are dependencies in a field you can make all the changes in the proper fields and download the information all together If you intend to use this write to Phone feature it is recommended that you do a Read Data from Phone first and then make the changes so that nothing gets inadvertently overwritten NOTE DO NOT TOUCH THE PHONE WHILE WRITING IS IN PROGRESS S...

Страница 14: ...SAMSUNG Proprietary Contents may change without notice Product Support Tools 4 4 This Document can not be used without Samsung s authorization ...

Страница 15: ...TDMI CPU core FROM U102 K5A3281CTM 32Mbit Flash ROM MCP SRAM U102 K5A3281CTM 8Mbit SRAM MCP CPU U100 MSM6000 208FBGA ARM 7TDMI microprocessor is used for the main processing The CPU controls all the circuitry The MSM6000 derives all of its internal clock sources from two clock inputs TCXO 19 20MHz and XTAL 32 768KHz The clock of 32 768KHz is used for sleep This is equipped with the ARM 7TDMI CPU c...

Страница 16: ...ntegrated CODEC contains all of the required conversion and amplification stages for the audio front end Clock Modem clock 19 20MHz This clock signal is used for ARM 7TDMI Sleep clock 32 768KHz This clock signal is used for sleep RFT6122 RFR6122 AND MSM INTERFACE A CDMA Data Interface TX_IP TX_IM TX_QP TX_QM U400 pins 29 30 27 28 Differential analog input for I and Q component used during CDMA mod...

Страница 17: ...nal from the microphone is inputted to the internal CODEC The voice signal is then amplified by the internal amplifier and is converted to PCM data to be outputted to the MSM as 13bit data This data is then processed by the MSM U100 s internal RX AUDIO PATH The PCM data from the MSM U100 s internal is inputted to the internal CODEC and the data will be decoded by the internal DAC and audio levels ...

Страница 18: ...to deliver the suitable power needed at the input stage of Driver amp Dynamic range is 90dB and its control voltage varies from 0 2V to 2 5V 5 2 2 Receiver For CDMA 800MHz LOW NOISE AMPLIFIER LNA The low noise amplifier included in RFR6122 amplifies a weak signal received from the base station to obtain the optimum signal level RF BAND PASS FILTER RX RF SAW FILTER The RF BPF F300 passes only speci...

Страница 19: ...t is a voltage controlled temperature compensated crystal oscillator with the frequency stability of 19 20MHz 2 0ppm over all useful temperature range The frequency is controlled by the voltage from the MSM6000 considering the ambient temperature TEMPERATURE TO VOLTAGE CONVERTOR The temperature to voltage convertor TH101 detects the peripheral temperature It is used to compensate the variance in c...

Страница 20: ... T_SNDESN_I Send ESN 39 T_BACKLIGHT_ON_I Backlight on 40 T_BACKLIGHT_OFF_I Backlight off 41 T_LAMP_ON_I Lamp on 42 T_LAMP_OFF_I Lamp off 43 T_LCD_CONTRAST_I LCD contrast adjust 45 T_VIBRATOR_ON_I Activate a vibrator 46 T_VIBRATOR_OFF_I Inactivate a vibrator 47 T_DTMFON_I Turn on DTMF 48 T_DTMFOFF_I Turn off DTMF 51 T_BATT_TYPE_I Battery type 52 T_READ_BATT_I Saved low battery value read 53 T_VBATT...

Страница 21: ...and fall setting 154 T_CDMA_LNA_3RISE_I LNA rise and fall setting 155 T_CDMA_LNA_3FALL_I LNA rise and fall setting 156 T_VCO_COARSE_TUNE_TA BLE_I Set VCO table 157 T_RFR_BB_FILTER_I RFR baseband filter 171 T_FAC_RXRAS_ADJ_I Factory RX RAS 172 T_FAC_HIGH_TXRAS_ADJ_I High gain factory TX pwr RAS 173 T_FAC_TXRAS_ADJ_I Low gain factory TX pwr RAS 174 T_FAC_CH_FLATNESS_I Factory TX pwr ch flatness 175 ...

Страница 22: ...SAMSUNG Proprietary Contents may change without notice Circuit Description 5 8 This Document can not be used without Samsung s authorization ...

Страница 23: ...er Supply Test Jig Test Cable CDMA Mobile Station Test Set HP8285A HP8960 CMD 80 etc Spectrum Analyzer include CDMA Test Mode HP8596E 6 2 Configuration of Test CAUTION The test jig and data cable has a voltage drop of 0 15V at Max power output you d better set the DC power supply to 4 15V for normal test condition Nominal voltage of battery is 4 0V at cellular phone ...

Страница 24: ...e 6 2 This Document can not be used without Samsung s authorization 6 3 TEST CABLE CONNECTIONS 6 3 1 TEST CABLE 6 3 2 TEST CABLE CONNECTIONS 1 KMS 510 D 2 RF CABLE 1 4dB Loss for CDMA 3 BNC CONNECTOR RF 4 PLUG CONNECT TO SCH N500 5 DATA CABLE 6 Dsub 18PIN CONNECTOR DATA ...

Страница 25: ... CABLE 1 BACK SIDE DATA DESCRIPTION Dsub CONN PIN NO V_BAT 5 DP_RX_DATA 8 DP_TX_DATA 9 HP_PWR 18 DC_VOLT 24 25 GROUND 3 23 17 6 3 4 CONVERSION TABLE OF FREQUENCY vs CHANNEL T Y P E CHANNEL CONVERSION EQUATION REMARK TX FREQUENCY 1 N 779 990 N 1023 F 0 03 N 825 00 F 0 03 N 1023 825 00 N CH NUMBER F FREQUENCY CDMA RX FREQUENCY 990 N 1023 990 N 1023 F 0 03 N 825 00 F 0 03 N 1023 870 00 ...

Страница 26: ...h behavior in line with existing cell phone END buttons Turns the Phone ON OFF Press for a while about 2 3 sec A dynamically reassigned control with the current action always displayed onscreen LEFT RIGHT Moves on screen focus or list selection LEFT RIGHT changes spin box control selection toggles check box control Faster scrolling SEND Performs a call by a selected phone number CLEAR Cancel or en...

Страница 27: ... You can set channel 2xxxx Example 2 0363 Channel number Mode CDMA and press the right soft key Soft2 key to save mode channel value D To finish the Test Mode You should enter the command 002 6 5 2 Channel selection and Tx power output level control A Enter to Test Mode 4 7 6 8 1 3 5 8 0 B 001 Suspend C 009 0363 Push the right soft key Set to 0363 channel D 007 Carrier On TX On E 014 Spread spectr...

Страница 28: ...UPIED CDMA BANDWIDTH 001 Suspend 009 0363 right soft key Soft2 Set channel to 363 007 Carrier On 014 Spread spectrum 016 280 right soft key Soft2 Set AGC level Measure the bandwidth spec 1 23MHz 4 LIMITATIONS ON EMISSIONS 001 Suspend 009 0363 right soft key Soft2 Set channel to 363 007 Carrier On 014 Spread spectrum 016 280 right soft key Soft2 Set AGC level Measure the spurious at FC 885kHz FC 1 ...

Страница 29: ...END Q202 pin1 2 5 6 3 3volt Check Q202 and its neighboring circuits V_IN Problem No Yes U204 VO2 2 85volt VO1 2 65volt Check U204 and its neighboring circuits V_MSMP V_MSMA Problem No Yes Press PWR button C243 pin 3 3volt Check Battery and its neighboring circuits V_BAT Problem Q203 Pin1 High Check U100 U204 and its neighboring circuits PS_HOLD Problem No No Yes Yes Yes END Q202 pin1 2 5 6 3 3volt...

Страница 30: ...Flow Chart of Troubleshooting SAMSUNG Proprietary Contents may change without notice 7 2 This Document can not be used without Samsung s authorization ...

Страница 31: ...Flow Chart of Troubleshooting SAMSUNG Proprietary Contents may change without notice 7 3 This Document can not be used without Samsung s authorization ...

Страница 32: ... TCXO applied to U104 pin2 Check OSC301 U449 and its neighboring circuits TCXO signal outputted from U104 pin4 Check U104 and its neighboring circuits Replace if required No No Yes Yes Yes END Press PWR button TCXO applied to U104 pin2 Check OSC301 U449 and its neighboring circuits TCXO signal outputted from U104 pin4 Check U104 and its neighboring circuits Replace if required No No Yes Yes Yes EN...

Страница 33: ...Flow Chart of Troubleshooting SAMSUNG Proprietary Contents may change without notice 7 5 This Document can not be used without Samsung s authorization ...

Страница 34: ...00 3 3Volt U200 pin4 Check Battery and its neighboring circuits Replace if required Is the output of U200 pin7 180 volt Check U200 ZD201 EL sheet Replac if required No No No Yes Yes Yes Yes END Press any button on the phone H level U200 pin5 Check U100 3 3Volt U200 pin4 Check Battery and its neighboring circuits Replace if required Is the output of U200 pin7 180 volt Check U200 ZD201 EL sheet Repl...

Страница 35: ...Flow Chart of Troubleshooting SAMSUNG Proprietary Contents may change without notice 7 7 This Document can not be used without Samsung s authorization ...

Страница 36: ...es Yes Yes Is Key press sensed Replace Key Dome sheet or Check dust No Yes END Waveform exist U105 pin2 6 Check U105 and its neighboring circuits No Yes Waveform exist C151 C152 Check U100 No Yes Abnormal Key tone voice melody ring tone Key tone Voice problem Yes No Waveform exist C139 C142 Check U100 Waveform exist U103 pin6 10 Check U103 and its neighboring circuits Normal sound Check speaker co...

Страница 37: ...Flow Chart of Troubleshooting SAMSUNG Proprietary Contents may change without notice 7 9 This Document can not be used without Samsung s authorization ...

Страница 38: ...tice 7 10 This Document can not be used without Samsung s authorization 7 2 Receiver Transmitter Section Start Normal SVC OK Setup Call OK Sensitivity 104dBm Max Power 22dBm Check RX path Check TX path Check RX path in detail Check TX path in detail No No No No Yes Yes Yes END Yes ...

Страница 39: ...8 1786 74MHz exist at C337 Check OSC301 CP_Rxleve at R317 and its neighboring circuits Yes No Check Gain Characteristics Duplexer F401 LNA U303 RF SAW F300 Check RX path RF Local signal 1739 28 1786 74MHz exist at C308 Check OSC301 CP_Rxleve at R317 and its neighboring circuits Yes No Check Gain Characteristics Duplexer F401 LNA U303 RF SAW F300 Check Gain Characteristics Duplexer F401 LNA U303 RF...

Страница 40: ...Flow Chart of Troubleshooting SAMSUNG Proprietary Contents may change without notice 7 12 This Document can not be used without Samsung s authorization ...

Страница 41: ...h Yes TX signal 824 64 848 37MHz exist at U400 pin23 Check U400 pin12 and its neighboring circuits No Yes Check Gain Characteristics RFT6122 U400 RF SAW F400 Power Amp U447 Duplexer F401 Check TX path Yes TX signal 824 64 848 37MHz exist at U400 pin23 Check U400 pin12 and its neighboring circuits No Yes Check Gain Characteristics RFT6122 U400 RF SAW F400 Power Amp U447 Duplexer F401 ...

Страница 42: ...Flow Chart of Troubleshooting SAMSUNG Proprietary Contents may change without notice 7 14 This Document can not be used without Samsung s authorization ...

Страница 43: ... 005061 C117 C CER CHIP 2203 005061 C118 C CER CHIP 2203 001405 C119 C CER CHIP 2203 001405 C120 C CER CHIP 2203 001405 C121 C CER CHIP 2203 001405 C122 C TA CHIP 2404 001352 C123 C CER CHIP 2203 005482 C124 C CER CHIP 2203 006399 C125 C CER CHIP 2203 005061 C126 C TA CHIP 2404 001105 C127 C CER CHIP 2203 005061 C128 C CER CHIP 2203 005061 C129 C CER CHIP 2203 005061 C130 C CER CHIP 2203 005061 C1...

Страница 44: ...000885 C212 C CER CHIP 2203 006399 C213 C CER CHIP 2203 006399 C214 C CER CHIP 2203 006399 C229 C CER CHIP 2203 005061 C231 C CER CHIP 2203 005061 C232 C CER CHIP 2203 000233 C233 C CER CHIP 2203 000995 C234 C CER CHIP 2203 005061 C235 C CER CHIP 2203 000438 C236 C CER CHIP 2203 000438 C237 C CER CHIP 2203 000438 C238 C CER CHIP 2203 006201 C239 C CER CHIP 2203 000254 C240 C CER CHIP 2203 006201 C...

Страница 45: ...05482 C311 C CER CHIP 2203 006399 C312 C CER CHIP 2203 000550 C313 C CER CHIP 2203 005482 C314 C CER CHIP 2203 006105 C315 C CER CHIP 2203 000233 C317 C CER CHIP 2203 000233 C318 C CER CHIP 2203 000233 C319 C CER CHIP 2203 005057 C320 C CER CHIP 2203 005057 C321 C CER CHIP 2203 000438 C322 C CER CHIP 2203 006105 C323 C CER CHIP 2203 000233 C324 C CER CHIP 2203 005482 C325 C CER CHIP 2203 000254 C4...

Страница 46: ...CHIP 2203 001033 C436 C CER CHIP 2203 000940 C437 C CER CHIP 2203 005061 C438 C CER CHIP 2203 000233 CN200 CONNECTOR INTERFACE 3710 001611 CN201 CONNECTOR SOCKET 3710 001105 CN202 CONNECTOR BATTERY 3711 005781 CN204 JACK EAR PHONE 3722 002104 D100 DIODE TVS 0406 001203 D101 DIODE TVS 0406 001203 D200 DIODE SCHOTTKY 0404 001157 D201 DIODE ARRAY 0407 001002 D202 DIODE TVS 0406 001203 D203 DIODE TVS ...

Страница 47: ...01 LED 0601 001094 LED202 LED 0601 001094 LED203 LED 0601 001094 LED204 LED 0601 001094 LED205 LED 0601 001094 LED206 LED 0601 001094 LED207 LED 0601 001094 LED208 LED 0601 001094 LED209 LED 0601 001094 LED210 LED 0601 001094 LED211 LED 0601 001094 LED212 LED 0601 001094 OSC101 CRYSTAL SMD 2801 003747 OSC301 OSCILLATOR VCTCXO 2809 001280 Q200 TR DIGITAL 0504 000168 Q201 TR DIGITAL 0504 000168 Q202...

Страница 48: ... 007107 R130 R CHIP 2007 007312 R131 R CHIP 2007 007312 R132 R CHIP 2007 000138 R133 R CHIP 2007 000162 R134 R CHIP 2007 000775 R135 R CHIP 2007 000775 R136 R CHIP 2007 007313 R137 R CHIP 2007 007313 R138 R CHIP 2007 001308 R201 R CHIP 2007 000171 R202 R CHIP 2007 000171 R204 R CHIP 2007 000157 R205 R CHIP 2007 000690 R206 R CHIP 2007 000162 R207 R CHIP 2007 000163 R208 R CHIP 2007 000138 R209 R C...

Страница 49: ... R240 R CHIP 2007 000140 R241 R CHIP 2007 000148 R246 R CHIP 2007 008404 R248 R CHIP 2007 007315 R249 R CHIP 2007 003004 R250 R CHIP 2007 003004 R301 R CHIP 2007 001156 R302 R CHIP 2007 000138 R303 R CHIP 2007 001156 R304 R CHIP 2007 001156 R305 R CHIP 2007 001156 R306 R CHIP 2007 002796 R307 R CHIP 2007 000171 R309 R CHIP 2007 008964 R310 R CHIP 2007 003010 R311 R CHIP 2007 000171 R312 R CHIP 200...

Страница 50: ...OS LOGIC 0801 000306 U105 IC ANALOG MULTIPLEX 1001 001161 U200 IC EL DRIVER 1003 001395 U203 IC VOLTAGE COMP 1202 001036 U204 IC POWER SUPERVISOR 1203 003040 U206 DIODE TVS 0406 001187 U208 DIODE TVS 0406 001187 U209 IC POSI FIXED REG 1203 003650 U300 IC RECEIVER 1205 002549 U400 IC TRANSMITTER 1205 002548 U401 IC POWER AMP 1201 002228 U402 TR ARRAY 0506 001004 V201 VARISTOR 1405 001082 V202 VARIS...

Страница 51: ... Proprietary Contents may change without notice 9 1 This Document can not be used without Samsung s authorization 9 1 Exploded Views QMW01 QRF03 QFR01 QKP01 QME01 QLC01 QMP01 QMI01 QSH01 QCR12 QRE01 QIF01 QCR20 QBA19 QBA00 QRF01 QSP01 QMO01 ...

Страница 52: ...CHN500 MODULE WD G1206W7 6WEOi GH07 00739A QME01 ㅤ UNIT METAL DOME SCH N500 SSM5017P083 GH59 02239A QMI01 ㅤ MICROPHONE ASSY SCHN380 2 130 500uA GH30 00174A QMO01 ㅤ MOTOR DC SCHN380 MOTOR DMJBRK12BQ SC GH31 00150A QMP01 ㅤ PBA MAIN SCHN500 SCH N500 EU INDA PB GH92 02271A QMW01 ㅤ PCT MAIN WINDOW SCH N500 ACRYL TRP GH72 24175A QRE01 ㅤ MEC REAR CASE SCH N500 TATA GH75 07755A QRF01 ㅤ RMO RF COVER SCH N5...

Страница 53: ...M GH68 03459A MANUAL QUICK GUIDE SCH N500 RELIANCE GH68 07504A MANUAL QUICK GUIDE SCH N500 RELIANCE GH68 07765A LABEL R MRP TAT SCH N500 TAT POLYE GH68 08148A LABEL R MAIN TAT SCH N500 TAT POLY GH68 08157A CUSHION CASE MAIN SCH N380 HIPS T0 6 GH69 02737A BOX P SCHN500 TATA SCH N500 SC300 GH69 03260A ICT SHIELD FRONT SCH N500 STS 0 3 GH70 00723A MPR WINDOW BOHO VINYL B SCH N356 ST GH74 08753B MPR T...

Страница 54: ...ange without notice 9 4 This Document can not be used without Samsung s authorization 9 3 Test Jig GH80 10502C 9 3 1 RF Test Cable GH39 00261A 9 3 2 Test Cable GH39 00122A 9 3 3 Serial Cable 9 3 4 Power Supply Cable 9 3 5 DATA CABLE GH39 00221A 9 3 6 TA GH44 00902A ...

Страница 55: ...10 Block Diagrams 10 1 SAMSUNG Proprietary Contents may change without notice This Document can not be used without Samsung s authorization ...

Страница 56: ...SAMSUNG Proprietary Contents may change without notice 11 PCB Diagrams 11 1 This Document can not be used without Samsung s authorization 11 1 Main PCB Top Diagram ...

Страница 57: ...SAMSUNG Proprietary Contents may change without notice PCB Diagrams 11 2 This Document can not be used without Samsung s authorization 11 2 Main PCB Bottom Diagram ...

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