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Samsung SGH-N188 Service Manual
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Samsung SGH-N188 Service Manual

Samsung SGH-N188 Service Manual

Dual band mobile cellular phone
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ELECTRONICS
SERVICE
DUAL BAND Mobile Cellular Phone
DUAL BAND Mobile
Cellular Phone
SGH-N188
C
Manual
CONTENTS
1. Exploded Views and Parts List
2. PCB Diagrams
3. Electrical Parts List
4. Block Diagrams
5. Flow chart of trouble shooting

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Summary of Contents for Samsung SGH-N188

  • Page 1 DUAL BAND Mobile Cellular Phone ELECTRONICS SGH-N188 SERVICE Manual DUAL BAND Mobile Cellular Phone CONTENTS 1. Exploded Views and Parts List 2. PCB Diagrams 3. Electrical Parts List 4. Block Diagrams 5. Flow chart of trouble shooting...
  • Page 2 ELECTRONICS Samsung Electronics Co.,Ltd. Printed in Korea 09/2000 Rev 1.0 GH68-01480A...

  • Page 3: Table Of Contents

    1. Exploded Views and Parts List Main Main Parts List Travel Adapter Travel Adapter Parts List Ciger Light Adapter Ciger Light Adapter Parts List Hands Free Kit Test Zig Earphone 1-10 Data Kit 1-11 Desk Top Charger 2. PCB Diagrams Main Top Main Bottom 3.
  • Page 4 1. Exploded Views and Parts List 1-1 Main 1-3-2 1-3-3 1-3-1 1-3-4 1-3-5 13-2 13-1 13-3 13-5 13-4 Exploded Views and Parts List...
  • Page 5 1-2 Main Parts List PARTS NAME SEC CODE COLOR Q`TY REMARK FRONT ASS`Y GH75-00960A DARK GRAY GH75-00960B SILVER GH75-00960C GOLD GH75-00960D BLUE GH72-02146A DARK GRAY GH72-02146B SILVER GH72-02146C GOLD GH72-02146D BLUE EARPIECE DECORATION GH72-01674A FLIP ASS`Y GH75-00959A DARK GRAY GH75-00959B SILVER GH75-00959C GOLD...
  • Page 6 PARTS NAME SEC CODE COLOR Q`TY REMARK GH72-01535G DARK GRAY MAIN LOCKER SPRING 13-5 GH61-00009A REAR COVER 13-6 GH72-01533A GRAY BLACK GH72-01533F LIGHT GRAY GH72-01533G DARK GRAY ANTENNA GH42-00058E GRAY BLACK GH42-00058A DARK GRAY SCREW 6001-001346 LABEL MAIN GH68-01629A TEC&OTHER GH68-01629B BATTERY STANDARD GH43-00285A...

  • Page 7: Travel Adapter

    1-3 Travel Adapter 1-4 Travel Adapter Parts List TYPE SEC CODE REMARK GH44-00119C CHINA GH44-00119A EUROPE GH44-00119B UNITED KINGDOM Gh44-00119D AUSTRALIA Exploded Views and Parts List...

  • Page 8: Ciger Light Adapter

    1-5 Ciger Light Adapter 1-6 Ciger Light Adapter Parts List DESCRIPTION SEC CODE REMARK Ciger Light Adapter Code GH44-00040A BLACK Exploded Views and Parts List...
  • Page 9 Phone Microphone Hands-Free Box Speaker Antenna CAL. S/W Test Jig Cradle Red (Battery (+)) Black (GND) Bracket Orange (ignition) White (Stereo Mute) Bracket...

  • Page 10: Test Zig

    1-8 Test Zig TEST JIG GH80-10508A TEST JIG CABLE GH39-30532A Exploded Views and Parts List...

  • Page 11: Data Kit

    1-9 Earphone EARPHONE GH96-00830A 1-10 Data Kit DATA KIT GH39-30533A Exploded Views and Parts List...

  • Page 12: Desk Top Charger

    1-11 Desk Top Charger DESK TOP CHARGER GH44-00163B Exploded Views and Parts List...
  • Page 13 2. PCB Diagrams 2-1 Main Top PCB Diagrams...

  • Page 14: Main Bottom

    2-2 Main Bottom PCB Diagrams...

  • Page 15: Electrical Parts List

    3. Electrical Parts List 3-1 Main Parts List Reference SEC CODE Part Description D303 0401-001033 ÒDIODE-SWITCHING;MCL4154,25V,200mA,M-MELF,TPÓ D431 0402-001329 ÒDIODE-RECTIFIER;STPS140Z,40,1A,SOD-123,TPÓ ÒD402,D410Ó 0402-001331 ÒDIODE-RECTIFIER;CRS04,40V,1A,S-FLAT,TPÓ ÒD406,D427Ó 0406-001083 ÒDIODE-TVS;-,6.1/-/7.2V,150W,SOT-323-5LÓ ÒD407,D408Ó 0406-001104 ÒDIODE-TVS;ESDA6V1-5W6,6.1/-/7.2V,100W,SOT-323-6LÓ ÒD302,D401,D403Ó 0407-001002 ÒDIODE-ARRAY;DAN222,80V,300mA,CA2-3,EM3,TPÓ D304 0407-001007 ÒDIODE-ARRAY;UMN1,80V,25mA,CA4-2,UM5,TRÓ ÒQ301,Q403Ó 0501-000162 ÒTR-SMALL SIGNAL;2SA1576,PNP,200MW,SOT-323,TPÓ Q400 0501-000218 ÒTR-SMALL SIGNAL;2SC4081,NPN,200mW,UMT,TP,180-3Ó...
  • Page 16 Reference SEC CODE Part Description U201 1205-001653 ÒIC-TRANSCEIVER;HD155121F,QFP,48P,-,PLASTIC,4V,400MÓ U414 1205-001881 ÒIC-COMM. CONTROLLER;VP40575,BGA,180P,472MIL,PLASTIÓ U106 1209-001251 ÒIC-PLL/SYNTHESISER;LMX2336LSLB,CSP,20P,-,PLASTIC,5Ó U205 1209-001292 ÒIC-ETC, LINEAR;HD155171NP01EL,QFP,24P,165MIL,PLASTÓ TH400 1404-001005 ÒTHERMISTOR-NTC;47Kohm,5%,4050K,2.0mW/C,TPÓ ÒD305,U311Ó 1405-001018 ÒVARISTOR;14V,-,1.6x0.8mm,TPÓ ÒD306,D415Ó 1405-001019 ÒVARISTOR;5.6V,-,1.6x0.8mm,TPÓ ÒD411,D413,D414,D419Ó 1405-001082 ÒVARISTOR;5.6V,20A,1x0.5x0.6mm,TPÓ ÒD420,D421,D422,D423Ó 1405-001082 ÒVARISTOR;5.6V,20A,1x0.5x0.6mm,TPÓ ÒD425,D426,D429,D430Ó 1405-001082 ÒVARISTOR;5.6V,20A,1x0.5x0.6mm,TPÓ ÒC558,D432Ó 1405-001093 ÒVARISTOR;14V,20A,1x0.5x0.6mm,TPÓ ÒR200,R213,R215,R321Ó...
  • Page 17 Reference SEC CODE Part Description R401 2007-000982 ÒR-CHIP;5.6Kohm,5%,1/16W,DA,TP,1005Ó R105 2007-001244 ÒR-CHIP;91Kohm,5%,1/16W,DA,TP,1005Ó ÒR119,R120,R121,R122Ó 2007-001288 ÒR-CHIP;18ohm,5%,1/16W,DA,TP,1005Ó ÒR123,R126,R211Ó 2007-001288 ÒR-CHIP;18ohm,5%,1/16W,DA,TP,1005Ó R217 2007-001291 ÒR-CHIP;30ohm,5%,1/16W,DA,TP,1005Ó ÒR203,R204,R221,R529Ó 2007-001298 ÒR-CHIP;51ohm,5%,1/16W,DA,TP,1005Ó ÒR202,R230,R234Ó 2007-001301 ÒR-CHIP;68ohm,5%,1/16W,DA,TP,1005Ó R236 2007-001305 ÒR-CHIP;120ohm,5%,1/16W,DA,TP,1005Ó ÒR222,R235Ó 2007-001306 ÒR-CHIP;150ohm,5%,1/16W,DA,TP,1005Ó ÒR107,R214,R218Ó 2007-001307 ÒR-CHIP;180ohm,5%,1/16W,DA,TP,1005Ó R426 2007-001308 ÒR-CHIP;200ohm,5%,1/16W,DA,TP,1005Ó R113 2007-001323 ÒR-CHIP;3Kohm,5%,1/16W,DA,TP,1005Ó...
  • Page 18 Reference SEC CODE Part Description ÒC147,C210,C236,C238Ó 2203-000254 ÒC-CERAMIC,CHIP;10nF,10%,16V,X7R,TP,1005,-Ó ÒC251,C307,C309,C313Ó 2203-000254 ÒC-CERAMIC,CHIP;10nF,10%,16V,X7R,TP,1005,-Ó ÒC314,C319,C325,C326Ó 2203-000254 ÒC-CERAMIC,CHIP;10nF,10%,16V,X7R,TP,1005,-Ó ÒC331,C333,C334,C335Ó 2203-000254 ÒC-CERAMIC,CHIP;10nF,10%,16V,X7R,TP,1005,-Ó ÒC354,C432,C434,C440Ó 2203-000254 ÒC-CERAMIC,CHIP;10nF,10%,16V,X7R,TP,1005,-Ó ÒC449,C536Ó 2203-000254 ÒC-CERAMIC,CHIP;10nF,10%,16V,X7R,TP,1005,-Ó ÒC263,C268,C554Ó 2203-000278 ÒC-CERAMIC,CHIP;0.01nF,0.5pF,50V,NP0,TP,1005Ó ÒC239,C580,C581Ó 2203-000330 ÒC-CERAMIC,CHIP;0.012nF,5%,50V,NP0,TP,1005Ó C212 2203-000359 ÒC-CERAMIC,CHIP;0.15nF,5%,50V,NP0,TP,1005Ó ÒC131,C233,C244Ó 2203-000425 ÒC-CERAMIC,CHIP;0.018nF,5%,50V,NP0,TP,1005Ó ÒC126,C136,C139,C205Ó 2203-000438 ÒC-CERAMIC,CHIP;1nF,10%,50V,X7R,TP,1005,-Ó ÒC207,C209,C211,C221Ó 2203-000438 ÒC-CERAMIC,CHIP;1nF,10%,50V,X7R,TP,1005,-Ó...
  • Page 19 Reference SEC CODE Part Description ÒC424,C459Ó 2203-001432 ÒC-CERAMIC,CHIP;47nF,+80-20%,16V,Y5V,TP,1005Ó C338 2203-002443 ÒC-CERAMIC,CHIP;0.33nF,10%,50V,X7R,TP,1005Ó C120 2203-002525 ÒC-CERAMIC,CHIP;0.56nF,10%,50V,X7R,TP,1005Ó C589 2203-002687 ÒC-CERAMIC,CHIP;1.2nF,10%,50V,X7R,TP,1005Ó ÒC329,C444,C445,C539Ó 2203-003054 ÒC-CERAMIC,CHIP;0.009nF,0.25pF,50V,NP0,TP,1005Ó ÒC106,C107,C110,C111Ó 2203-005061 ÒC-CERAMIC,CHIP;100nF,+80-20%,16V,Y5V,TP,1005Ó ÒC112,C114,C116,C246Ó 2203-005061 ÒC-CERAMIC,CHIP;100nF,+80-20%,16V,Y5V,TP,1005Ó ÒC301,C308,C316,C317Ó 2203-005061 ÒC-CERAMIC,CHIP;100nF,+80-20%,16V,Y5V,TP,1005Ó ÒC332,C339,C407,C409Ó 2203-005061 ÒC-CERAMIC,CHIP;100nF,+80-20%,16V,Y5V,TP,1005Ó ÒC418,C419,C420,C421Ó 2203-005061 ÒC-CERAMIC,CHIP;100nF,+80-20%,16V,Y5V,TP,1005Ó ÒC423,C427,C458,C461Ó 2203-005061 ÒC-CERAMIC,CHIP;100nF,+80-20%,16V,Y5V,TP,1005Ó ÒC534,C545,C551Ó 2203-005061 ÒC-CERAMIC,CHIP;100nF,+80-20%,16V,Y5V,TP,1005Ó...
  • Page 20 Reference SEC CODE Part Description L211 2703-001722 ÒINDUCTOR-SMD;18nH,5%,1.0x0.5x0.5mmÓ ÒL218,L219,L220Ó 2703-001723 ÒINDUCTOR-SMD;33nH,5%,1.0x0.5x0.5mmÓ L204 2703-001726 ÒINDUCTOR-SMD;27nH,5%,1x0.5x0.5mmÓ ÒL203,L205,L206Ó 2703-001727 ÒINDUCTOR-SMD;22nH,5%,1x0.5x0.5mmÓ ÒL207,L217Ó 2703-001730 ÒINDUCTOR-SMD;15nH,5%,1x0.5x0.5mmÓ ÒL210,L214Ó 2703-001735 ÒINDUCTOR-SMD;3.9nH,10%,1x0.5x0.5mmÓ L400 2703-001740 ÒINDUCTOR-SMD;10uH,20%,6.6x4.45x2.8mmÓ ÒL404,L406Ó 2703-001752 ÒINDUCTOR-SMD;39nH,5%,1.0x0.5x0.5mmÓ L216 2703-001770 ÒINDUCTOR-SMD;3.3NH,0.3NH,1.0X0.5X0.5MMÓ L209 2703-001786 ÒINDUCTOR-SMD;10NH,5%,1.0X0.5X0.5MMÓ L100 2703-001791 ÒINDUCTOR-SMD;15NH,5%,1.8X1.12X1.02MMÓ L202 2703-001794 ÒINDUCTOR-SMD;120NH,2%,1.8X1.12X1.02MMÓ...

  • Page 21: Main Parts List Bottom

    3-2 Main Parts List Bottom Reference SEC CODE Part Description Vendor Part No. BAT301 4301-001031 BACKUP BATTERY RB414II06N BUZ300 3002-001098 BUZZER-SMD BRT-03S C100 2203-000466 C-CHIP, 1pF, 0.25pF, 50V, TP, 1005 GRM36C0G010C50PT C101 2203-000254 C-CHIP, 10nF, 10%, 16V, TP, 1005 GRM36X7R103K25PT C102 2203-000254 C-CHIP, 10nF, 10%, 16V, TP, 1005...
  • Page 22 Reference SEC CODE Part Description Vendor Part No. C146 2203-000233 C-CHIP, 100pF, 5%, 50V, TP, 1005 GRM36COG101J50PT C147 2203-000254 C-CHIP, 10nF, 10%, 16V, TP, 1005 GRM36X7R103K25PT C148 2203-000679 C-CHIP, 27pF, 5%, 50V, TP, 1005 GRM36COG270J50PT C149 2404-001105 CAP-TANTAL, 10uF, 20%, 6.3V, 2012 TESVSPOJ106M8R C150 2404-001101...
  • Page 23 Reference SEC CODE Part Description Vendor Part No. C545 2203-005061 C-CHIP, 100nF, +80-20%, 16V, TP, 1005 GRM36Y5V104Z16PT C552 2203-000872 C-CHIP, 3pf, 1608 CLIOCL30CBNC C554 2203-000278 C-CHIP, 10pF, 5%, 50V, TP, 1005 GRM36COG050C50PT C555 2203-000679 C-CHIP, 27pF, 5%, 50V, TP, 1005 GRM36COG270J50PT C578 2203-000679...
  • Page 24 Reference SEC CODE Part Description Vendor Part No. R117 2007-000140 R-CHIP, 1Kohm, 5%, 1/16W, DA, TP, 1005 ERJ2GEJ102X R118 2007-000242 R-CHIP, 1.5Kohm, 5%, 1/16w, TP, 1005 ERJ2GEJ152X R119 2007-001288 R-CHIP, 18ohm, 5%, 1/16W, DA, TP, 1005 ERJ2GEJ180 R120 2007-001288 R-CHIP, 18ohm, 5%, 1/16W, DA, TP, 1005 ERJ2GEJ180 R121 2007-001288...
  • Page 25 Reference SEC CODE Part Description Vendor Part No. U100 2809-001237 OSCILLATOR-VCTCXO, 13MHz,5ppm,10Kohm//10pF,TP,3V,2mA TCO-9131B 13MHz U101 1203-001701 IC-VOLTAGE REGULATOR,SOT-23,5P LP2982AIM5X-3.0 U102 1203-001454 IC-VOLTAGE REGULATOR, SOT-23, 5P, 59MIL LP2981AIM5X-3.0 U103 1203-001454 IC-VOLTAGE REGULATOR, SOT-23, 5P, 59MIL LP2981AIM5X-3.0 U104 2806-001210 VCO-DUAL 545MHZ,-,-,TP,2.85V,5MA ENFVJ152S20 U105 1201-001583 IC-POWER AMP, 08109,QFP,16P,PLASTIC,8V,-30to+100C,...

  • Page 26: Main Parts List Top

    3-3 Main Parts List TOP Reference SEC CODE Part Description Vendor Part No. C141 2203-000628 C-CHIP, 22pF, 5%, 50V, TP, 1005 GRM36COG220J50PT C144 2203-000254 C-CHIP, 10nF, 10%, 16V, TP, 1005 GRM36X7R103K16PT C200 2203-000679 C-CHIP, 27pF, 5%, 50V, TP, 1005 GRM36COG270J50PT C202 2301-001197 C-CHIP, 390pF,5%, 16V TP,2012...
  • Page 27 Reference SEC CODE Part Description Vendor Part No. C243 2203-000628 C-CHIP, 22pF, 5%, 50V, TP, 1005 GRM36COG220J50PT C244 2203-000425 C-CHIP, 18pF, 5%, 50V, TP, 1005 GRM36COG180J50PT C246 2203-005061 C-CHIP, 100nF, +80-20%, 16V, TP, 1005 GRM36Y5V104Z16PT C247 2203-001259 C-CHIP, 8pF, 0.5pF, 50V, TP, 1005 GRM36COG080D50PT C249 2404-001210...
  • Page 28 Reference SEC CODE Part Description Vendor Part No. C417 2203-005065 C-CHIP, 1uF, +80-20%, 10V, TP, 1608 GRM39Y5V105Z10PT C418 2203-005061 C-CHIP, 100nF, 1005 CL05F104ZONC C419 2203-005061 C-CHIP, 100nF, 1005 CL05F104ZONC C420 2203-005061 C-CHIP, 100nF, 1005 CL05F104ZONC C421 2203-005061 C-CHIP, 100nF, 1005 CL05F104ZONC C422 2203-005065...
  • Page 29 Reference SEC CODE Part Description Vendor Part No. C560 2203-000679 C-CHIP, 27pF, 5%, 50V, TP, 1005 GRM36COG270J50PT C561 2203-000679 C-CHIP, 27pF, 5%, 50V, TP, 1005 GRM36COG270J50PT C562 2203-000679 C-CHIP, 27pF, 5%, 50V, TP, 1005 GRM36COG270J50PT C563 2203-000679 C-CHIP, 27pF, 5%, 50V, TP, 1005 GRM36COG270J50PT C565 2203-000679...
  • Page 30 Reference SEC CODE Part Description Vendor Part No. J402 3709-001144 SIM CONNECTOR 1318723-6 J403 3710-001633 BÕd CONNECTOR AXK59302005 L200 2703-001685 Inductor, 82nH, 5%, 1608 0603HS-82NXJBC L201 2703-001514 Inductor, 68nH, 5%, 1.8x1.12x1.02mm 0603CS-68NXJBC L202 2703-001794 Inductor, 120nH,10%,1.6x0.8x0.8mm 0603HS-N12XJBC L203 2703-001727 Inductor, 22nH, 5%, 1005 HK1005-22NJ-T L204 2703-001726...
  • Page 31 Reference SEC CODE Part Description Vendor Part No. R213 2007-000138 R-CHIP, 100ohm, 5%, 1/16W, DA, TP, 1005 ERJ2GEJ101X R214 2007-001307 R-CHIP, 180ohm, 5%, 1/16W, DA, TP, 1005 ERJ2GEJ181 R215 2007-000138 R-CHIP, 100ohm, 5%, 1/16W, DA, TP, 1005 ERJ2GEJ101X R216 2007-007132 R-CHIP, 15Kohm, 1%, 1/16W, DA, TP, 1005 RK73H1ETP1502F R217...
  • Page 32 Reference SEC CODE Part Description Vendor Part No. R422 2007-000162 R-CHIP, 100Kohm, 5%, 1/16W, DA, TP, 1005 RC1005J104CS R423 2007-000162 R-CHIP, 100Kohm, 5%, 1/16W, DA, TP, 1005 RC1005J104CS R424 2007-000148 R-CHIP, 10Kohm, 5%, 1/16W, DA, TP, 1005 RC1005J103CS R426 2007-003008 R-CHIP, 200ohm, 5%, 1/16W, DA, TP, 1005 ERJ2GEJ200X R427...
  • Page 33 Reference SEC CODE Part Description Vendor Part No. R559 2007-007771 R-CHIP, 0ohm, 5%, 1/16W, DA, TP, 1005 RC1005J000CS R561 2007-007592 R-CHIP, 270Kohm, 1%, 1/16W, DA, TP, 1005 RK73H1ETP2703F R562 2007-007135 R-CHIP, 18Kohm, 1%, 1/16W, DA, TP, 1005 RK73H1ETP1802F R563 2007-007309 R-CHIP, 12Kohm, 1%, 1/16W, DA, TP, 1005 RK73H1ETP1202F R564...
  • Page 34 Reference SEC CODE Part Description Vendor Part No. C447 N.C POINT C543 N.C POINT C544 N.C POINT C566 N.C POINT C567 N.C POINT C582 N.C POINT R219 N.C POINT R237 N.C POINT R436 N.C POINT R448 N.C POINT L221 N.C POINT R572 N.C POINT C541...
  • Page 35 4. Block Diagrams 4-1 Main Base Band Block Diagrams...

  • Page 36: Main Rf

    4-2 Main RF Block Diagrams...

  • Page 37: Power On

    5. Flow chart of trouble shooting 5-1 Power ON ’POWER ON’ does not work Check the Battery Voltage Charge the Battery is more than 3.2V The node Check U303 and the path from +VBATT between D303 and BAT300 = 3V ? to BAT300 U410 pin 1,4,10 >...
  • Page 38 5-2 Initial Initial Failure Check and repair the important U452 pin 4 = "H" ? signals of U414 as follows The node Check the circult between R312 and C325 related to reset = "H" (RST) R348 = "H" (BOOT) Resolder R348 Check all the other connection by Test S/W R440 = "H"...

  • Page 39: Charging Part

    5-3 Charging Part Abnormal charging part Check the J401 pin 14, 15 9 V ? Replace TA Resolder Check the U441 pin 14, 15 9 V ? C569, C410, FB400, FB401 U409 pin 2 = "L" ? Resolder R420 Resolder components around Check the U441 pin 10 4.1V ? U441...

  • Page 40: Sim Part

    5-4 Sim Part Phone can’t access SIM card Check the circuit related to U308 Q402 pin4 = 3V ? Replace the PBA Q402 pin5 = "H" ? Replace Q402 Q402 pin2,3 = 3V ? Resoldering J402 and check open J402 pin1,7 = 3V ? connection from Q402 to J402 After Power ON, Check SIMCLK Signal on J402 pin 3...

  • Page 41: Microphone Part

    5-5 Microphone Part Microphone does not work Check Resolder J403 pin 3, 4 and the connection D413, D414, R567, R568 from J403 pin 3, 4 Check the circuit related to U308 U413, U415 pin 2 (AVCC) 3.0V? Check the circuit Resolder the R444, R445, R446, from U414 to U413, U415 R447, C446, C450 and C451...

  • Page 42: Speaker Part

    5-6 Speaker Part Speaker does not work Check the depression of Modify the SPK pins the SPK pins Replace the Speaker Is Speaker working? Flow chart of trouble shooting...

  • Page 43: Key Data Input

    5-7 Key Data Input Check Initial operation the pin 12, 13, 14 and 15 Replace the PBA of J403 low? When one of the keys is pushed, Resolder pin 12,13,14 and 15 one of pin 12,13,14 and 15 of J403 of J403 is high ? Key PCB is OK ?

  • Page 44: Alert Tone

    5-8 Alert tone Abnormal Alert tone Is there alert wave form on the ALERT by Test S/W R305 during alert tone test? Is there alert wave form on the Check the circuit related to Q300 Q300 pin 3 during alert tone test? U303 pin 5 3.3V? Check the circuit related to U303...

  • Page 45: Ring Indicator

    5-9 Ring Indicator Ring Indicator LED does not work GPO2 by Test S/W U400 pin 2 = "H" ? Between D300 and R300 = "H" ? Replace D300 Check the LED Resolder R300, U400 Flow chart of trouble shooting...

  • Page 46: Back Light

    5-10 Back Light Backlight does not work Backlight "ON" mode Select backlight "ON" mode in the menu? Between R306 and GPO1 by test S/W R310 = "H" ? LCD BACKLIGHT KEY PCB LED Check the U305 pin 7 210~230 VAC ? L300, U305, R306, Q301, C314, C315, C316 Resolder CON1 pin 37, 38...

  • Page 47: Gsm Receiver

    5-11 GSM Receiver Rx On RF input : CH center freq. + 67.7 kHz Amp. : -50 dBm U208 Check IF connector Pin 2 - > resolder -65 dBm Check U208 Resolder & VC1 : L U208 Pin 9 Pin 9 VC2 : L -65 dBm -65 dBm...

  • Page 48: Gsm Transmit

    5-12 GSM Transmit Tx On (level : 5) U208 Resolder Pin 2 J401 pin 20 30 dBm Check U208 VC1 : H Change or Resolder Pin 7 VC2 : L U208 30 dBm VC3 : L Check Ant. S/W, Control Circuit U206 Resolder Pin 4...

  • Page 49: Dcs Receiver

    5-13 DCS Receiver Rx On RF input : CH center freq. + 67.7 kHz Amp. : -50 dBm U208 Check IF connector Pin 2 - > resolder -65 dBm Check U208 Resolder & VC1 : L U208 Pin 16 Pin 16 VC2 : L -65 dBm -65 dBm...

  • Page 50: Dcs Transmit

    5-14 DCS Transmit Tx On (level : 0) U208 Resolder Pin 2 J401 pin 20 25 dBm Check U208 VC1 : L Change or Resolder Pin 13 VC2 : H U208 25 dBm VC3 : L Check Ant. S/W, Control Circuit U207 Resolder Pin 4...

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