LG XC102 Service Manual
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LG XC102 Service Manual

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MICRO Hi-Fi SYSTEM
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
MODEL : XC102 (XCS102F)
P/NO : AFN32840891
APRIL, 2007

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  • Page 1 MICRO Hi-Fi SYSTEM SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODEL : XC102 (XCS102F) P/NO : AFN32840891 APRIL, 2007...

  • Page 2: Table Of Contents

    CONTENTS SECTION 1 WIRING DIAGRAM ............3-18 BLOCK DIAGRAM.............3-20 GENERAL 1. SMPS BLOCK DIAGRAM.......3-20 SERVICING PRECAUTIONS ........1-2 2. MAIN & FRONT BLOCK DIAGRAM ....3-22 • NOTES REGARDING HANDLING OF THE PICK-UP SCHEMATIC DIAGRAMS .........3-24 • NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1.

  • Page 3: Servicing Precautions

    SECTION 1 GENERAL SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. 2.

  • Page 4: Notes Regarding Compact Disc Player Repairs

    NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.

  • Page 5: Esd Precautions

    ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called electrostatically sensitive devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

  • Page 6: Location Of Users Controls

    LOCATION OF USERS CONTROLS FRONT / BACK PANEL 8. • DEMO (POWER) • TIMER 2. CD • CLOCK 3. • (PLAY/PAUSE) • SET (RDS - OPTIONAL) • (SKIP/SEARCH) (USB connector) TUNE.-/+ 10.PORT.IN jack • (STOP) 11. AUX (PORTABLE) • VOLUME CONTROL KNOB 12.TUNER 4.

  • Page 7: Remote Control

    REMOTE CONTROL DIMMER MUTE POWER • USB • FUNCTION PRESET/FOLDER( VOLUME ( CLOCK SLEEP (PLAY/PAUSE) • (STOP) • • (SKIP/SEARCH) PROGRAM/MEMO TUN.-/+ • D.SKIP REPEAT • RDS (Radio Data System) FUNCTION EQ master • • RDS : OPTIONAL XDSS plus • •...

  • Page 8: Specifications

    SPECIFICATIONS • GENERAL Power supply Refer to the back panel of the unit. Power consumption Refer to the back panel of the unit. Net Weight 3.0kg External dimensions (WxHxD) 174 x 245 x 278mm • TUNER Tuning Range 87.5 ~ 108.0MHz or 65 ~ 74MHz, 87.5 ~ 108.0MHz Intermediate Frequency 10.7MHz Signal to Noise Ratio...
  • Page 9 MEMO...

  • Page 10: Exploded Views

    SECTION 2 EXPLODED VIEWS CABINET EXPLODED VIEW CABLE2 FRONT CABLE3 SMPS MAIN...

  • Page 11: Cd Mechanism Exploded View

    CD MECHANISM (CDM-330) EXPLODED VIEW 012A 012A...

  • Page 12: Speaker Exploded View

    SPEAKER EXPLODED VIEW MODEL : XCS102F A80A WIRE80...
  • Page 13 MEMO MEMO...

  • Page 14: Packing Accessory View

    PACKING ACCESSORY VIEW 808 Battery 824 Antenna Loop (AM) 825 Antenna (FM) 900 Remote Control 801 Instruction Ass'y 803 Packing 803 Packing 804 Bag 802 Box...

  • Page 15: Audio Part Electrical

    SECTION 3 AUDIO PART ELECTRICAL AUDIO ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER (SMPS) POWER (SMPS) Check the fuse Replace the fuse F901 Check the DC V of C905. Check BD901, LF901, 902 If DC V is over 400V Chcek the DC V of C909, C903, Replace IC 901,902 Check IC901, 902 C921 If DC V is in 14~19V...

  • Page 16: P-Sens

    2. P-SENS P-SENS Check the PIN6 of P9702 Check power circuit Trouble shooting If DC V is over 5.6V 3. VKK CHECK VKK check Check the PIN3 of P9702 Check power circuit Trouble shooting If DC V is over -28V ±2 4.

  • Page 17: Micom Part Check Ii

    5. MICOM PART CHECK II MICOM part check II Check if Refer to voltage of P7904_PIN5 SMPS troubleshooting. is 5.6V. Check Check if output of both end voltage of D101(RL104) is 5V. D101 Replace D101. Check D101. Check Check if output of IC101 Check Q102_base Q101_ emitter/collector (KIA7042) is over 4.3V.

  • Page 18: Ic103(Ks4Cd21Cs) Check

    6. IC103(KS4CD21CS) CHECK Check IC100(78KOKF2)_ PIN 22, 24 Refer to PIN22 Check micom micom troubleshooting DATA PIN24 CLK voltage 5V. Replace micom. Check micom.

  • Page 19: Fld Display Check

    7. FLD DISPLAY CHECK FLD display check Check Refer to SMPS P7904_PIN1, 2, 3 voltage input. Check if both end votage of F1, F2 are over 3.7V. VKK : over 26V. Check WF31 connection and power. Check WF31 connection. Pin1 : FL-22 Pin2 : FL+26 Pin3 : VKK- over 26V.

  • Page 20: Pwm Modulation Part Check

    8. PWM MODULATION PART CHECK PWM modulation part check Refer to P7905_PIN9 SMPS troubleshooting. 3.3V checking Check X601 Replace X601. Check IC604(PS9829) 12.288MHz. VDD PIN voltage(3, 7, 8, 10, 22, 29, 39, 47, 56, 65, 72, 94). Check X601_PIN2 3.3V. Check Check FB614 Check IC605_...

  • Page 21: Power Amp Part Check

    9. POWER AMP PART CHECK Power AMP part check P7905_3PIN : +12V, Refer to SMPS troubleshooting. PIN13, 14, 15 : 35V. Check IC700 PIN21, 26, 29, 34 input voltage. Check Check each LINE registor output voltage. IC700 PIN1,17, 18, 19, 36 IC700 : R701, 702, 726, 727 +12V input.

  • Page 22: Aux Function Check

    10. AUX FUNCTION CHECK AUX function check Check JK800 connection. Check Check IC200(BU4052)_ Check µ-COM(IC301)_ IC200(BU4052)_PIN16 PIN4, 11 input PIN83, 84 commucation. VDD, PIN8 VSS waveform. power. Replace IC200 Check IC200(BU4052)_ PIN3, 13 output waveform. Check Check Refer to IC801(MC4580)_PIN4 IC801(MC4580)_PIN 2, 6 SMPS troubleshooting.

  • Page 23: Tuner Function Check

    11. TUNER FUNCTION CHECK TUNER function check Check TUNER Check TUNER module voltage(PIN2 : 9V). module(TU601) operation. Check IC200(BU4052)_PIN1, 12 input waveform. Check IC200(BU4052)_PIN3, 13 Check IC200(BU4052)_ output waveform and IC601 PIN16 VDD, PIN8 VSS power. (BU4052)_PIN2,15 input waveform. Replace IC200. Replace IC200.

  • Page 24: Portable In Function Check

    12. PORTABLE IN FUNCTION CHECK PORTABLE IN function check Check JK32 connection. Check Check IC200(BU4052)_ Check µ-COM(IC301)_ IC200(BU4052)_PIN16 PIN5, 14 input PIN83, 84 commucation. VDD, PIN8 VSS waveform. power. Replace IC200 Check IC200(BU4052)_ PIN3, 13 output waveform. Check Check Refer to IC801(MC4580)_PIN4 IC801(MC4580)_PIN 2, 6 SMPS troubleshooting.

  • Page 25: Internal Block Diagram Of Ics

    INTERNAL BLOCK DIAGRAM OF ICs 1. AK5358 AGND VD DGND MCLK Clock Divider Decimation AINL Filter Modulator LRCK SCLK Decimation AINR Filter Modulator Serial I/O SDTO Interface VCOM Voltage Reference CKS2 CKS1 CKS0 2. BU4052 3-11...

  • Page 26: Lc78692Nw

    3. LC78692NW CLOCK DOUT PLL2 EFMIN LRSY GENERATOR Control RFOUT DATACK Audio Output 8FS DIGITAL Control 1 Bit DATA FILTER SLICE DEEMPHASIS PHLPF LEVEL TEST1 Stream CONTROL Control & STDATA ATTENUATION CONTROL STCK DECODER SIGNAL STREQ PROCESSOR Bass-Boost TEST0 Memory I/F MONITOR SLCISET CONT0...

  • Page 27: Ps9829B

    4. PS9829B MBCK MLRCK Input Serial Audio MSDIN[0:3] & Output Output Interface SBCK SLRCK SSDIN[0:3] DMIX_MCLK Serial OLRCK Down Audio OBCK Sample Output Mixer Rate DMIX_SDOUT Interface Converter Automatic Gain PWM1_P/M Limiter Input PWM2_P/M Mapper PWM3_P/M PWM4_P/M Trim 4 Band Bass Main Mixer...

  • Page 28: Str-W6753

    6. STR-W6753 DRIVE Protection latch Reg& Iconst Delay Burst Start Control Stop Burst MaxON OCP/BD Bottom Selector Soft Start SS/OLP Counter 3-14...

  • Page 29: Tas5142

    7. TAS5142 System Microcontroller TAS5508 BST_A Bootstrap Capacitors BST_B RESET_AB VALID RESET_CD PWM_A OUT_A -Order L-C Left- Output Output Filter Input Channel H-Bridge 1 for Each HúBridge 1 OUT_B Output PWM_B Half-Bridge 2-Channel H-Bridge BTL Mode OUT_C PWM_C -Order L-C Output Right- Output Filter...

  • Page 30: U1739Ej2V1Ud00/Kf2_E

    8. U1739EJ2V1UD00/KF2_E TO00/TI010/P01 16-bit timer/ event counter 00 TI000/P00 Port 0 P00 to P06 RxD6/P14 (LINSEL) TO01/TI011/P06 16-bit timer/ Port 1 P10 to P17 event counter 01 TI001/P05 Port 2 P20 to P27 8-bit timer H0 TOH0/P15 Port 3 P30 to P33 TOH1/P16 8-bit timer H1 Port 4...

  • Page 31: Utc Mc4580

    9. UTC MC4580 9-1. PIN CONFIGURATION 9-2. TEST CIRCUIT 3-17...

  • Page 32: Wiring Diagram

    WIRING DIAGRAM [Total CNT Q'ty : 10ea] 2 CH SPK TERMINAL JACK 1. SMPS MAIN : 2ea 2. MAIN CD : 2ea 3. MAIN FRONT : 1ea SMPS PCB 1 CD SINGLE MD 4. FRONT CD : 1ea 5. CD MD : 3ea CD PCB 5P P...

  • Page 33: Block Diagram

    BLOCK DIAGRAMS 1. SMPS BLOCK DIAGRAM RECTIFICATION Switch SMOOTHING IC # 1 CIRCUIT AMP (+) 3 1.5V P9701 ZNR & FEED BACK FILTER 3.5V (278R35) 12V (78R12) 5V(P-SEN S) MAIN AC INPUT Switch 6.1V (KIA278R05) IC # 2 P9702 -12V -31.

  • Page 34: Main & Front Block Diagram

    2. MAIN & FRONT BLOCK DIAGRAM XC102 : 2 CH (50W X 2Ch) W/O DECK XC62 : 2 CH (30W X 2Ch ) W /SINGLE DECK FLD (DISPLAY) VFD DR DRIVE IVE IC XC62 62 ON ONLY PT632 PT6324 DECK/ HD...

  • Page 35: Schematic Diagrams

    BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter FROM THE LG CORPORATION. ALL COMPONENTS IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. SHOULD...

  • Page 36: Main Schematic Diagram

    2. MAIN SCHEMATIC DIAGRAM 3-26 3-27...

  • Page 37: Amp Schematic Diagram

    3. AMP SCHEMATIC DIAGRAM 3-28 3-29...

  • Page 38: Front Schematic Diagram

    4. FRONT SCHEMATIC DIAGRAM 3-30 3-31...

  • Page 39: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) 3-32 3-33...
  • Page 40 MAIN P.C.BOARD (BOTTOM VIEW) 3-34 3-35...

  • Page 41: Smps P.c.board

    2. SMPS P.C.BOARD 3-36 3-37...

  • Page 42: Front P.c.board

    3. FRONT P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-38 3-39...
  • Page 43 MEMO MEMO 3-40 3-41...

  • Page 44: Cd Part Electrical

    SECTION 4 CD PART ELECTRICAL CD ELECTRICAL TROUBLESHOOTING GUIDE 1. CD PART TROUBLESHOOTING Turn on CD OPEN CLOSE check Connector check (PN804) Check voltage CN806 PIN1 : 12, PIN2 : 6.3V Check voltage PN805 PIN22 : CLOSE, PIN23 : OPEN Connector check “Reading”...
  • Page 45 1-1. OPEN CLOSE NG Connector locking check (PN804) Check power supply circuit (PN805, CN806) Defective main power supply CN806 PIN1 : 12V, PIN2 : 6.3V PN805 PIN8 : +5V_AD Check voltage change of OPEN CLOSE IC803 INPUT voltage PIN6 : 12V, Defective micom PIN7:6.3V (PN805 PIN2 : BTL_MUTE, 23 : OPEN,...
  • Page 46 1-2. “READING” DISPLAY CHECK (= ONLY “CD” DISPLAY) Conector locking check (PN802, PN804, PN805, CN806) Check power supply port (PN805, CN806) Defective connector or main power supply CN806 PIN1 : 12V, PIN2 : 6.3V, PIN4 : 5V PN805 PIN8 = 5V_AD Check voltage The PIN2 of IC804 Defective IC804...
  • Page 47 1-3. READING OK CHECK (= “NO DISC” DISPLAY) Connector locking check (PN801, PN802) Check PN802 Defective pick up or Does sled move? PIN3, 4 (SL+, SL-) IC802 or IC801 Check PN801 Defective pick up or Does lense move? PIN13, 16 (FA+, FA-) IC802 or IC801 (= UP &...
  • Page 48 1-4. READING OK CHECK #A (= “NO DISC” DISPLAY) Does Does slin SL+ waveform waveform appear at appear at (IC802 PIN13 (IC802 PIN5) Defective IC801 and PN802 PIN3) waveform #2 waveform #2 sled drive sled motor wave wave Defective IC802 Check PN802 connector line Defective PN802 connector Defective pick up sled motor...
  • Page 49 1-6. READING OK CHECK #C (= “NO DISC” DISPLAY) Is 3.3V Is ?V applied applied to to PIN10 of PN801 PIN30, 36, 39, 41, 61, Defective IC804 laser supply voltage 68, 75 of IC801 RF IC check supply voltage check Is 2.3V PIN18 (LDO) of IC801 Defective IC801...
  • Page 50 1-7. READING OK CHECK #D (= “NO DISC” DISPLAY) Does Does SP+ waveform spin waveform appear at (IC802 appear at (IC802 PIN6) Defective IC801 PIN11 and PN802 PIN5) waveform #4 waveform #4 spindle spindle drive motor drive wave wave Defective IC802 Check PN802 connector line Defective PN802 connector Defective pick up...
  • Page 51 1-8. READING OK CHECK #E (= “NO DISC” DISPLAY) Does Does TA+ waveform tain - waveform appear at (IC802 PIN17 appear at (IC802 PIN22) Defective IC801 and PN801 PIN14) waveform #5 waveform #5 tracking tracking drive coil drive wave wave Defective IC802 Check PN802 Defective PN802 connector...

  • Page 52: Usb Part Troubleshooting

    2. USB PART TROUBLESHOOTING Turn on USB “Checking” or Connector check “USB” display check (PN805, CN806, PN810 ) Check power supply circuit (CN806) Check micom interface circuit (PN805) PIN13 : RX (IC805 PIN49 : TXD) PIN14 : TX (IC805 PIN33 : RXD) Reading OK check Check PN810 1PIN : 5V Check PN810 PIN2(D-), 3(D+)

  • Page 53: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT #1.MICOM INTERFACE WAVEFORM #1.MICOM INTERFACE WAVEFORM (PN805 PIN26, 19, 3, 15) during power on (PN805 PIN26, 19, 3, 15) during normal play PIN26 : WRQ PIN26 : WRQ PIN19 : RESET PIN19 : RESET PIN3 : DI (IC801 PIN46 DATA OUT) PIN3 : DI (IC801 PIN46 DATA OUT) PIN15 : DO (IC801 PIN45 DATA IN) PIN15 : DO (IC801 PIN45 DATA IN)

  • Page 54: Sled Drive And Motor Waveform

    #2.SLED DRIVE AND MOTOR WAVEFORM #2.SLED DRIVE AND MOTOR WAVEFORM (IC802 PIN5, 13) when focus search (IC802 PIN5, 13) during normal play PIN5 : SLIN PIN5 : SLIN PIN13 : SL+ PIN13 : SL+ #3.FOCUS DRIVE AND MOTOR WAVEFORM #3.FOCUS DRIVE AND MOTOR WAVEFORM (IC802 PIN25, IC802 PIN16) (IC802 PIN25, IC802 PIN16) •...

  • Page 55: Spindle Drive And Motor Waveform

    #4.SPINDLE DRIVE AND MOTOR WAVEFORM #5.TRACK DRIVE AND MOTOR WAVEFORM (IC802 PIN6, 11) when TOC reading (IC802 PIN22, IC802 PIN17) during normal play PIN22 : TAO PIN6 : SPIN PIN11 : SP+ PIN17 : TA+ #6.RF, FOCUS AND TRACKING ERROR WAVEFORM (IC801 PIN2, 10, 16) during normal play PIN2 : RFOUT PIN 16 : TE...

  • Page 56: Schematic Diagrams

    SCHEMATIC DIAGRAMS 1. CD SCHEMATIC DIAGRAM 4-13 4-14...

  • Page 57: Usb Schematic Diagram

    2. USB SCHEMATIC DIAGRAM 4-15 4-16...

  • Page 58: Printed Circuit Board Diagram

    PRINTED CIRCUIT BOARD DIAGRAM CD P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 4-17 4-18...
  • Page 59 MEMO MEMO 4-19 4-20...

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