LG LX-U250A Service Manual Download Page 8

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- 2-1 -

CD PART

❏

TROUBLESHOOTING GUIDE

SECTION 2. ELECTRICAL

TURN ON CD

OPEN CLOSE CHECK

“ READING ”

DISPLAY CHECK

READING OK CHECK

IF PLAY, AUDIO

OUTPUT CHECK

CONNECTOR CHECK (PN806)

CHECK LC78690W (IC801)

CHECK AM5810FP (IC802)

CHECK PICKUP MOVEMENT

CONNECTOR CHECK(PN801,PN802)

CHECK MICOM INTERFACE CIRCUIT( PN805 )

CONNECTOR CHECK ( PN802, PN804, PN806 )

CHECK MICOM INTERFACE CIRCUIT( PN805 )

CHECK POWER SUPPLY CIRCUIT( PN806 )

CONNECTOR CHECK ( PN804, PN806 )

Summary of Contents for LX-U250A

Page 1: ...MICRO COMPONENT SYSTEM SERVICE MANUAL P N 3829RAP005X NOVEMBER 2005 MODEL LX U250A LXS U250 SERVICE MANUAL MODEL LX U250A LXS U250 ...

Page 2: ...MAKOR CHECK POINT 2 10 INTERNAL BLOCK DIAGRAM of ICs 2 22 BLOCK DIAGRAM 2 29 SCHEMATIC DIAGRAMS 2 33 WIRING DIAGRAM 2 45 PRINTED CIRCUIT DIAGRAMS 2 47 SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3 1 SINGLE DECK MECHANISM 3 3 CD MECHANISM 3 5 SECTION 4 SPEAKER SECTION MODEL LXS U250 4 1 SECTION 5 REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST 5 1 ...

Page 3: ...aser beams may damage the eyes Absolutely never permit laser beams to enter the eyes Also NEVER switch ON the power to the laser output part lens etc of the pick up if it is damaged 5 Cleaning the lens surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When cleaning the lens surface th...

Page 4: ...tive bag do not place the pick up on the bag This is because there is the possibility of damage by static electricity 4 To prevent AC leakage the metal part of the soldering iron should be grounded 5 Workers should be grounded by an armband 1M Ω 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to prevent sta tic electricity changes in the clothing to...

Page 5: ...harges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparabl...

Page 6: ... 1 5 SPECIFICATIONS NOTE Specification are subject to change without notice in the course of product improvement ...

Page 7: ... 1 6 ...

Page 8: ... CHECK IF PLAY AUDIO OUTPUT CHECK OK CONNECTOR CHECK PN806 CHECK LC78690W IC801 CHECK AM5810FP IC802 CHECK PICKUP MOVEMENT CONNECTOR CHECK PN801 PN802 CHECK MICOM INTERFACE CIRCUIT PN805 CONNECTOR CHECK PN802 PN804 PN806 CHECK MICOM INTERFACE CIRCUIT PN805 CHECK POWER SUPPLY CIRCUIT PN806 CONNECTOR CHECK PN804 PN806 ...

Page 9: ...K POWER SUPPLY CIRCUIT PN805 PN806 PN 806 PIN 4 12V PIN 5 6 2V PN805 PIN 1 5V CHECK VOLTAGE CHANGE OF OPEN CLOSE AND IC802 INPUT VOLTAGE PIN 7 8 20 6 2V PN805 PIN 2 BTL_MUTE 14 OPEN 15 CLOSE DEFECTIVE MAIN POEWR SUPPLY DEFECTIVE MICOM DEFECTIVE MECHANISM ...

Page 10: ...OR CONNECTOR DEFECTIVE MICOM OR CONNECTOR DEFECTIVE IC801 CHECK VOLTAGE THE PIN 2 OF IC804 IC804 PIN 2 3 3V CHECK RESET SIGNAL OF PN805 PN805 PIN 4 3V CHECK POWER SUPPLY PORT PN805 PN806 PN 806 PIN 4 12V PIN 5 6 2V PN805 PIN 12 5V CHECK MICOM INTERFACE CIRCUIT PN805 PN805 PIN 3 4 5 6 7 8 9 SIGNAL CHECK 3 WRQ 4 RESET 5 DO 6 DI 7 CL 8 CE 9 FSEQ CHECK THE WAVE FORM 1 ...

Page 11: ...SL SL A B C D E CHECK PN801 PIN 13 16 FA FA CHECK PN801 PIN 10 LD CHECK PN802 PIN 5 6 SP SP CHECK PN801 PIN 14 15 TA TA DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802OR IC801 DOES LASER LIGHT DOES SPINDLE ROTATE IS READING OK ...

Page 12: ...VEFORM APPEAR AT IC802 PIN 13 AND PN 802 PIN 3 WAVEFORM 2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT IC802 PIN 5 WAVEFORM 2 SLED DRIVE WAVE CHECK PN802 CONNECTOR LINE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP SLED MOTOR ...

Page 13: ... APPEAR AT IC802 PIN 16 AND PN801 PIN 13 WAVEFORM 3 FOCUS COIL DRIVE WAVE DOES FAIN WAVEFORM APPEAR AT IC802 PIN 25 WAVEFORM 3 FOCUS DRIVE WAVE CHECK PN801 CONNECTOR LINE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN801 CONNECTOR DEFECTIVE PICKUP FOCUS ACTUATOR ...

Page 14: ...LY VOLTAGE CHECK CHECK PN801 CONNECTOR LINE IS 3 3 V APPLIED TO PIN30 36 39 41 61 68 75 OF IC801 RF IC SUPPLY VOLTAGE CHECK IS 2 3 V PIN18 OF IC801 LASER CONTROL VOLTAGE CHECK DEFECTIVE IC804 DEFECTIVE IC801 DEFECTIVE Q801 OR D801 DEFECTIVE PN801 CONNECTOR DEFECTIVE PICKUP LASER PART ...

Page 15: ...APPEAR AT IC802 PIN 11 AND PN802 PIN 5 WAVEFORM 4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT IC802 PIN 6 WAVEFORM 4 SPINDLE DRIVE WAVE CHECK PN802 CONNECTOR LINE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICKUP SPINDLE MOTOR DEFECTIVE PN802 CONNECTOR ...

Page 16: ...DRIVE WAVE CHECK PN802 CONNECTOR LINE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP OR IC801 DEFECTIVE PICKUP OR IC801 DOES ARF SIGNAL APPEAR IC801 PIN 2 WAVEFORM 6 DOES FE TE SIGNAL APPEAR IC801 PORT FE 10 TE 16 WAVEFORM 6 DOES TAIN WAVEFORM APPEAR AT IC802 PIN 22 WAVEFORM 5 TRACKING DRIVE WAVE ...

Page 17: ...MICOM INTERFACE WAVEFORM PN805 PIN 3 4 5 6 during normal play PIN 6 DI PIN 5 DO PIN 4 RESET PIN 3 WRQ 1 MICOM INTERFACE WAVEFORM PN805 PIN 7 8 9 during power on PIN 9 FSEQ PIN 8 CE PIN 7 CL 1 MICOM INTERFACE WAVEFORM PN805 PIN 7 8 9 during normal play PIN 9 FSEQ PIN 8 CE PIN 7 CL WAVEFORMS OF MAKOR CHECK POINT ...

Page 18: ...AND MOTOR WAVEFORM IC802 PIN 25 IC802 PIN 16 IC802 PIN 25 IC802 PIN 16 When focus search failed or there is no disc on tray There is disc on tray and focus search success PIN 5 SLIN PIN 13 SL PIN 25 FAO PIN 16 FA 2 SLED DRIVE AND MOTOR WAVEFORM IC802 PIN 5 13 during normal play PIN 5 SLIN PIN 13 SL PIN 25 FAO PIN 16 FA ...

Page 19: ...22 IC802 PIN 17 during normal play 4 SPINDLE DRIVE AND MOTOR WAVEFORM IC802 PIN 6 11 when TOC reading PIN 6 SPIN PIN 11 SP PIN 22 TAO PIN 17 TA 6 RF FOCUS AND TRACKING ERROR WAVEFORM IC801 PIN 2 10 16 during normal play PIN 2 RFOUT PIN 10 FE PIN 16 TE ...

Page 20: ... READING OK CHECK OK CONNECTOR CHECK PN805 PN806 PN810 CHECK POWER SUPPLY CIRCUIT PN806 CHECK MICOM INTERFACE CIRCUIT PN805 CHECK PN810 1 PIN 5V CHECK PN810 PIN 2 D 3 D CHECK OTI6888 IC805 CHECK LC78690W IC801 CONNECTOR CHECK PN806 IF PLAY AUDIO OUTPUT CHECK ...

Page 21: ...C 27V CHECK OK ZD900 VOLTAGE CHECK 5V IC301 26PIN PATTERN CHECK ZD901 27V CHECK D912 WAVE CHECK D912 CHANGE YES YES NO NO YES Q900 TURN ON CHECK C921 27V UNDER VOLT CHECK YES NO D907 D906 CHANGE OK VOLTAGE CHECK LIST YES NO Q900 CHANGE YES NO ...

Page 22: ... AND CHANGE Transformer CHANGE YES CN901 7 Pin DC VOLTOUTPUT CHECK YES NO NO IC903 Output DC VOLT CHECK 6 2V D908 12V CHECK AND CHANGE IC901 CHANGE YES D909 D910 VOLT CHECK YES YES NO NO SECTION CHECK YES NO IC904 CHANGE Q500 CHECK AND CHANGE YES IC904 1PIN High CHECK NO NO Muting CIRCUIT Troubleshooting MUTE CONDITION Q201 Q251 Q600 Q650 Base High IC201Troubleshooting CHECK ONLY Q201 Q251 YES NO ...

Page 23: ...IEW YES NO IC905 INPUT CHECK FUNK BLOCK INPUT CHECK Muting troubleshooting VIEW YES NO RY700 CONTROL CHECK OK SPK Relay Troubleshooting ONLY LX W550 s D503 12V CHECK VOLTAGE CHECK LIST YES NO RELAY CHANGE RY700 YES NO Q511 Collector Low CHECK IC204 Troubleshooting YES NO Q511 CHANGE Q511 Base High YES NO OUTPUT SOUND CHECK OK ...

Page 24: ...g YES YES TUNER IC905 2 37 PIN INPUT SIGNAL CHECK IC102 Troubleshooting YES YES DAB L BAND DAB L IC905 6 33 PIN INPUT SIGNAL CHECK IC102 Troubleshooting YES YES CD IC905 4 35 PIN INPUT SIGNAL CHECK CD Troubleshooting YES YES AUX IC905 5 34 PIN INPUT SIGNAL CHECK JK600 INPUT CHECK YES YES ...

Page 25: ... CHECK P SENS SECTION CHECK YES NO X301 CHECK X301 CHANGE YES NO IC301 17Pin VOLT INPUT Low High OK RESET SECTION CHECK YES NO IC204 16Pin INUT VOLT CHECK VOLTAGE CHECK LIST YES NO IC204 2 3 Pin CLK Data CHECK IC301 3 4Pin Data CHECK CD TAPE FUNCTION MODE YES NO CONTROLL FUNC CHECK OK IC204 CHANGE YES NO IC301 CHANGE IC301 IC204 pattern check YES YES NO ...

Page 26: ...8 9 PIN CLOCK DATA CHECK OK YES YES NO TUN600 CHANGE NO IC301 Troubleshooting YES IC905 Troubleshooting FUNC CLOCK DATA 19 20PIN CHECK VOLTAGE CHECK LIST YES 21 PIN VOLT CHECK EACH FUNC MODE INPUT SIGNAL CHECK 17 22 Pin OUTPUT SIGNAL CHECK YES NO FUNC Troubleshooting EACH FUNC MODE INPUT SIGNAL CHECK YES NO SPK Relay SECTION CHECK YES NO ...

Page 27: ...03 2 8Pin INPUT SIGNAL CHECK Q202 Q252 Base Low CHECK YES NO IC203 3 7 Pin OUT IC202 6 12V 4 Pin High check IC203 6Pin VCC volt check YES NO IC203 Troubleshooting NO Q202 Q252 CHANGE YES L201 2 3PIN check Power Check IC202 Troubleshooting YES NO VOLTAGE CHECK LIST NO DECK CHANGE C227 INPUT VOLT CHECK YES NO Q205 Base 0 6V CHECK YES IC203 Troubleshooting NO Q205 Collector Low YES Q205 CHANGE NO Q20...

Page 28: ...AB600L 4PIN 3 3V INPUT CHECK VOLTAGE CHECK LIST ONLY DAB series MODEL YES NO DAB600 DAB600L 11 13PIN PIN CLOCK DATA CHECK DAB600 DAB600L 6 8PIN OUTPUT CHECK IC301 75 76 PIN CLOCK DATA CHECK YES NO OK DAB600 DAB600L CHANGE YES NO IC301 Troubleshooting YES ...

Page 29: ... 2 22 INTERNAL BLOCK DIAGRAM of ICs NJW1190 BLOCK DIAGRAM ...

Page 30: ... 2 23 PIN FUNCTION SSOP44 ...

Page 31: ... 2 24 PIN FUNCTION QFP48 P1 ...

Page 32: ...ION GPIOA 7 GPIOA 6 NC NC NC NC gnd vdd LED1_out NC GPIOA 5 GPIOA 4 1 2 3 4 5 6 7 8 9 10 11 12 25 26 27 28 29 30 31 32 33 34 35 36 GPIOB 2 NC GPIOB 0 sda scl NC vdd xtal2 xtal1 gnd reset_b NC GPIOA 0 GPIOA 1 NC NC NC vdd gnd NC NC NC GPIOA 2 GPIOA 3 NC SIC REQ SID NC vdd DPLS_IO DMNS_IO gnd GPIOB 1 ext_int5 GPIOB 3 13 14 15 16 17 18 19 20 21 22 23 24 37 38 39 40 41 42 43 44 45 46 47 48 ...

Page 33: ...4 GPIOB 6 ex_romdata 2 ex_romdata 3 txd1 ex_romdata 7 ex_romdata 6 SIC REQ SID vdd DPLS_IO DMNS_IO gnd GPIOB 1 host_dev_sel gnd ex_romaddr 15 ex_romaddr 14 ex_romaddr 13 ex_romaddr 0 ex_romaddr 1 gnd sda scl vdd xtal2 xtal1 gnd reset_b mode0 ex_romdata 0 ex_romdata 1 ex_romaddr 2 ex_romaddr 3 rxdi1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 3...

Page 34: ...ONFIGURATION VO2 FWD REV IN2 VO2 BIAS OPIN4 OPIN4 MUTE GND VO3 VO3 OP OUT4 OPIN3 OPIN3 OPOUT3 POWVCC34 VO4 VO4 LDCONT PS INÅå PR EVCC VOL VOL 22 21 20 19 18 17 16 15 23 24 25 26 27 12 14 10 11 9 7 6 5 4 3 2 1 8 28 AM5810 POWVCC12 VO1 VO1 13 ...

Page 35: ... 2 28 PIN DESCRIPTION ...

Page 36: ... BLOCK DIAGRAM 2 29 2 30 ...

Page 37: ...2 31 2 32 WMA USB BLOCK DIAGRAM ...

Page 38: ...2 33 2 34 SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAM ...

Page 39: ...2 35 2 36 FRONT SCHEMATIC DIAGRAM ...

Page 40: ...2 37 2 38 POWER SCHEMATIC DIAGRAM ...

Page 41: ...2 39 2 40 DECK SCHEMATIC DIAGRAM ...

Page 42: ...2 41 2 42 CD SCHEMATIC DIAGRAM ...

Page 43: ...2 43 2 44 USB SCHEMATIC DIAGRAM ...

Page 44: ...2 45 2 46 WIRING DIAGRAM ...

Page 45: ...2 47 2 48 PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD ...

Page 46: ...2 49 2 50 FRONT P C BOARD ...

Page 47: ... CDP P C BOARD COMPONENT SIDE 2 51 2 52 ...

Page 48: ...2 53 2 54 CDP P C BOARD SOLDER SIDE ...

Page 49: ...2 55 2 56 LINEAR POWER ...

Page 50: ...250 252 254 253 258 256 255 257 259 450 261 262 305 A47 450 263 A46 A26 A41 260 A43 A00 301 SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION ...

Page 51: ...A00 028 026 013 037 008 504 039 505 038 007 002 003 031 032 001 006 030 029 027 011 025 503 502 024 009 012 018 023 503 019 404 020 403 501 033 504 034 005 036 035 004 402 014 401 015 016 017 SINGLE DECK MECHANISM ...

Page 52: ...3 3 3 4 CD MECHANISM 430 A26 430 026 A01 429 004 003 001 002 429 430 012 012 012 012 A03 020 011 430 018 014 013 017 015 431 430 A02 ...

Page 53: ...3 5 3 6 ...

Page 54: ... 4 1 MODEL LXS U250 850 851 860 852 857 856 855 854 853 861 SECTION 4 SPEAKER SECTION ...

Page 55: ... 4 2 ...

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