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LG LM-K3960A Service Manual

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3CD CHANGER
KARAOKE SYSTEM
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
MODEL: LM-K3960A, LMS-K3960V

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  • Page 1 3CD CHANGER KARAOKE SYSTEM SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODEL: LM-K3960A, LMS-K3960V...
  • Page 2 [CONTENTS] ❍ SECTION 1. GENERAL • SERVICING PRECAUTIONS ..........1-2 •...

  • Page 3: Section 1. General

    SECTION 1. GENERAL ❏ SERVICING PRECAUTIONS I 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. Storage in conductive bag Drop impact 2.
  • Page 4 I 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 I 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: Specifications

    ❏ SPECIFICATIONS General Power supply Refer to the main label. Power consumption 70 W (LM-K3960Q/LM-KW3960Q/LM-K3860Q model) 50 W (LM-K3565Q model) 30 W (LM-K3365Q model) Net Weight 6.5 kg External dimensions (W x H x D) 272 X 322 X 354 mm Tuner/Amplifier Tuning Range 87.5 - 108.0 MHz or 65 -74 MHz, 87.5 -108.0 MHz...
  • Page 7 - 1-6 -...

  • Page 8: Section 2. Electrical Section

    SECTION 2. ELECTRICAL SECTION ❏ ELECTRICAL TROUBLESHOOTING GUIDE I MICOM PART CHECK I Refer to SMPS P7904 6PIN P-SENS check Troubleshooting IC101 KIA7042? Check if IC101 KIA7042 input is over 5V IC101 KIA7042 relevant parts check Check if IC101 KIA7042 IC100 78KO/KF2 1 PIN input is over 4.3V Power Check...

  • Page 9: Micom Part Check Ii

    I MICOM PART CHECK II P7904 5PIN 5.6V check Refer to SMPS Troubleshooting D101 1SR35 both terminal power check Output 5V operation check D101 1SR35 relevant parts relevant parts check replacement Q101 EMITTER 5V check and COLLECTO normal Q102 BASE PIN 0.6V HIGH check Check if IC101 KIA7042 output...

  • Page 10: Fld Display Check

    I IC103 KS4CD21CS CHECK IC100 78KOKF2 22,24 PIN Check Refer to MICOM 22 PIN DATA MICOM power 5V check Troubleshooting relevant parts check relevant parts replacement normal normal I FLD DISPLAY CHECK P7904 1,2,3 power check Refer to SMPS Troubleshooting F1+, F2 both terminal: 3.7V and above VKK: power is over 26V P7302 connection status...
  • Page 11 If 5V defective D3191SR35 input and output power check IC100 © IC301 DATA Communication check relevant parts check 75 PIN © 3PIN STB relevant parts 76 PIN © 2PIN DO replacement 77 PIN © 4PIN DI 78 PIN © 1PIN CLK normal IC100 75 PIN ©...
  • Page 12 I PWM ALTERATION PART CHECK Refer to SMPS P7905 9PIN 3.3V check Troubleshooting IC604 PS9829 VDD PIN Power check (3.10.22.29.39.47.56.65.72. 87. 94) X601 12.288MHz operation check relevant parts check X604 12.288MHz relevant parts IC604 PS9829 replacement 86 PIN CLK input check normal R668(470Ω) output check relevant parts...

  • Page 13: Power Amp Part Check

    I POWER AMP PART CHECK P7905 3 PIN+12 13.14.15 PIN 32V Refer to SMPS Troubleshooting Each IC700,701,702,703 34.29.26.21 PIN input power check Each IC 700.701.702.703 1.36.17.18.19 PIN +12V input power check Each LINE resistance output power check IC700:R702.701.726.727.724 IC701:R730.729.750.753.752 IC702:R756.755.768.771.770 IC703:R774.773.794.797.796 PWM MODULATOR input power check Each IC...
  • Page 14 I AUX FUNCTION Check whether JK800 contacts or not IC200 (BU4052)4,11PI N input waveform check IC200 (BU4052)16PINVDD, 8PIN VSS power check IC200 (BU4052)3,13PIN output u-COM (IC301)83PIN,84PIN waveform check Communication check relevant parts replacement IC801 (MC4580) 2,6PIN input waveform check IC801 (MC4580)4PIN VSS,8PIN VDD power check Refer to SMPS Troubleshooting...

  • Page 15: Tuner Function Check

    I TUNER FUNCTION CHECK Tuner module (TU601) operation check TUNER MODUEL power check (2PIN 9Vcheck) IC200(BU4052)1, 12PIN input waveform check IC200 (BU4052)3,13PIN output waveform check IC601(BU4052)2,15PIN input waveform check IC200 (BU4052)16PIN- VDD,8PIN VSS power check IC801 (MC4580)2,6PIN input relevant parts waveform check.

  • Page 16: Tape Play Part Check

    I TAPE PLAY PART CHECK P2707:4 PIN © 12V Refer to SMPS Troubleshooting IC201 (HA12237)16 PIN 12V input waveform check IC201:5.26 PIN Signal Output check DECK HEAD input check HEAD WIRE or Mecha replacement DECK HEAD input IC201 32.39 PIN check relevant parts check IC20114 PIN MUTE operation check...

  • Page 17: Tape Rec Part Check

    I TAPE REC PART CHECK IC604 PS9829 #49,#52 PWM Refer to PWM modulation output check part Q601 Collector waveform check P7207 #2.#4 output check Board to Board cantact check P2707 #5.#7 input check IC203 MC4580 #1,#7 check IC203 8 PIN +12V check Refer to SMPS IC201 7.24 PIN REC input Troubleshooting...
  • Page 18 I SMPS POWER CIRCUIT *MAIN PART Check the fuse F901 Replace the fuse Check the DC V of C905. Check BD901, LF901,902 If DC V is over 400V Chcek the DC V Of C909, Check IC901 ,902 Replace IC 901,902 C903,C921 If DC V is in 14~19V and it is steady.
  • Page 19 *P-SENS PART Check the PIN6 OF P9702 Check power circuit Trouble If DC V is over 5.6V shooting *VKK PART Check the PIN3 OF P9702 Check power circuit If DC V is over -28V ±2 Trouble shooting - 2-12 -...

  • Page 20: Internal Block Diagram Of Ics

    ❏ INTERNAL BLOCK DIAGRAM of ICs • TAS5142 BLOCK DIAGRAM - 2-13 -...
  • Page 21 • U1739EJ2V1UD00/KF2_E BLOCK DIAGRAM - 2-14 -...
  • Page 22 • HA12237F BLOCK DIAGRAM - 2-15 -...
  • Page 23 • STR-S6757IF1905 BLOCK DIAGRAM • PS9829B BLOCK DIAGRAM - 2-16 -...

  • Page 24: Block Diagram

    • ES6838 BLOCK DIAGRAM GPIO TV-Encoder 32-Bit Display SRAM/ROM VDAC RISC OSD / SPU Interface Processor Controller Scaler 16 K Cache DeIntelacer Audio ADC HDMI I/F Serial Audio Interface Gateway Audio DAC Controller Huffman Descrambler Decoder T ransport Servo Controller / RF Video Processor A T API...
  • Page 25 • PT6324 BLOCK DIAGRAM - 2-18 -...
  • Page 26 ❏ BLOCK DIAGRAM OVERALL AV BLOCK DIAGRAM LC6324 DECK/AD 9.8304MHz MAIN BOARD AMP BOARD TAS5152_PDN MODE A.B VFD DATA.CLK HALF A.B SOL"A" 12.288 TAS5152_SD EXP CLK REC F.R SOL"B" DATA MOTER PS9829A HIGH/NO 9829_DAT AUDIO FL+/-, FR+/- DECK TAS5142 MICOM Power Amp MODUL RL+/-, RR+/-...

  • Page 27: Main Schematic Diagram

    ❏ SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM AUDIO VIDIO JACK A_MUTE PWM/DAC SPDIF OUT DECK MECHANISM SPDIF IN UART MICOM A,B,C,D,E,F,R CDMDI, DVDMDI P/UP CDDVDCT, VRDVD,VRD MMA[0..1MB]B[0..15] LDO1,LDO2 DSCK#,CKE,CSo#,RAS0 SDRAM CAS#,WE#,DQMX OPEN/CLOSE MPEG FOCUS/SLED MOTOR LA[0..21], LD[0..7] SLED±, F±,T± DRIVE SPINDLE/TACKING FLASH ESS6838...
  • Page 28 • MAIN SCHEMATIC DIAGRAM 2-23 2-24...
  • Page 29 • MAIN AMP SCHEMATIC DIAGRAM 2-25 2-26...

  • Page 30: Front Schematic Diagram

    • FRONT SCHEMATIC DIAGRAM 2-27 2-28...

  • Page 31: Smps Schematic Diagram

    • SMPS SCHEMATIC DIAGRAM 2-29 2-30...

  • Page 32: Deck Schematic Diagram

    • DECK SCHEMATIC DIAGRAM 2-31 2-32...
  • Page 33 • JACK & IO SCHEMATIC DIAGRAM 2-33 2-34...

  • Page 34: Wiring Diagram

    ❏ WIRING DIAGRAM P4004 P0401 P9702 DVD BLOCK IO JACK BLOCK SMPS BLOCK P9701 P5701 P4703 P7501 P7905 CD/DVD /AMP Power TO CD/DVD POWER FRONT 130Wx2 P7403 PS9829 Center/Surrd X3 60W P7904 Sub WooferX180W P3702 FRONT BLOCK P7302 P7709 P7206 P7207 P2706 P2707...

  • Page 35: Printed Circuit Diagrams

    ❏ PRINTED CIRCUIT DIAGRAMS • MAIN P.C. BOARD 2-37 2-38...
  • Page 36 • MAIN P.C. BOARD 2-39 2-40...

  • Page 37: Front P.c. Board

    • FRONT P.C. BOARD 2-41 2-42...

  • Page 38: Smps P.c. Board

    • SMPS P.C. BOARD • DECK P.C. BOARD 2-43 2-44...

  • Page 40: Section 3. Dvd Part Electrical

    SECTION 3. DVD PART ELECTRICAL ❏ DVD ELECTRICAL TROUBLESHOOTIHG GUIDE I POWER CHECK GUIDE POWER ON POWER ON PUSH KARAOKE DVD BUTTON DOES DVD/CD DOES AUX,FM 87.5 APPEAR AT FLD? APPEAR AT FLD? DOES IT DOES DISK1 APPEAR DVD APPEAR AT FLD? ERROR AT FLD? CHECK DOES NO DISC OR...
  • Page 41 I TEST &DEBUG FLOW POWER ON CHECK CONNECTION LINES BETWEEN FLASH FLASH &ES8381 OR THE FLASH ACCESS SHOW LOGO? MEMORY OPERATES PROPERLY? TIME WHETHER IS SUITABLE OR NOT. CHECK CONNECTION LINES BETWEEN SDRAM WORKS SDRAM (IC502)&ES8381 OR THE PROPERLY? SDRAM IS DAMAGED. CHECK THE RELATED CIRCUIT OF ES8381 VIDEO ES6698FD (IC501)PIN...
  • Page 42 DOES THE SLED LIMIT SW SIGNAL MOVE TO INNER SIDE CHECK THE MD ON P4407 IS LOW? WHEN IT IS AT OUTER POSITION? CHECK THE RELATED CIRCUIT OF SLED SIGNAL IS OK? SLED AND MOTOR DRIVER IC (IC401) CHECK THE CABLE CONNECTION WITH MECHA.
  • Page 43 CHECK THE LASER POWER CIRCUIT LASER TURNS ON DVDLD OR CDLD BETWEEN ES8381 AND POWER TRANSIS- WHEN READING OUTPUT PROPERLY? TOR. (Q405,Q406) DISC? COLLECTOR CHECK THE RELATED CIRCUIT OF VOLTAGE OF POWER LASER POWER TRANSISTOR. TRANSISTOR IS OK? (Q405,Q406) CHECK CABLE CONNECTION BETWEEN PDM01 AND PICK-UP HEAD.
  • Page 44 CHECK THE CONNECTIONS BETWEEN PROPER SIGNAL ON FOCUS ON OK? PDM01 AND PICK-UP HEAD. A,B,C,D FROM MD? CHECK THE RELATED CIRCUIT OF ES8381 PROPER FOO SIGNAL FOCUS SIGNAL. ON IC401? CHECK CABLE CONNECTION BETWEEN PDM01 AND MD. CHECK THE RELATED CIRCUIT BETWEEN PROPER TRO SIGNAL IC401 AND ES8381 TRACKING OK?
  • Page 45 OUTPUTS ARE OK CHECK THE CONNECTIONS BETWEEN AUDIO SIGNAL DATA ON DURING PLAYING ES8381 AND P4703 P4703 IS OK? DISK ? CHECK THE MAIN PCB FOR EXAMPLE COMPOSITE VIDEO , PICTURE CHECK THE VIDEO MUTE TR (Q411), SIGNAL DATA ON ES8381 OUTPUT OF VIDEO BUFFER IC (IC407)AND IS OK? ES8381 VIDEO SIGNAL DATA...

  • Page 46: Usb Part

    I USB PART TURN ON USB “SEARCHING ”OR CHECK THE POWER SUPPLY CIRCUIT. “USB ”DISPLAY CHECK (CHECK P5701) CHECK THE HRST#SIGNAL CHECK THE USB PART AND DVD PART LINE. CHECK THE USB JACK POWER SUPPLY. READING OK CHECK (CHECK P4302) CHECK THE USB DATA LINE.(P4302) CHECK THE IC405 (UBI9021).(CHECK DATA LINE PIN 14~17,20~23)

  • Page 47: When Power On,Reset &Data Etc Waveform

    I WAVEFORM WHEN POWER ON,RESET &DATA ETC WAVEFORM 1.RESET(DVD) 2.RX 3.TX 4.LCS3#(FLASH) Playing at USB function 1.HRST# 2.5V 3.D- 4.D+ - 3-8 -...

  • Page 48: Open/Close Waveform At Power On

    OPEN/CLOSE WAVEFORM AT POWER ON 1.Limit SW 2.OPEN 3.CLOSE STARTING ACTION WAVEFORM IN MD DEVICE 1.SLO (from MPEG) 2.SLED- 3.SLED+ (At Power on ) - 3-9 -...

  • Page 49: Focus Waveform (At Cd)

    FOCUS WAVEFORM (AT CD) 1.FDO 2.F+ 3.F- (INSERT CD ) FOCUS WAVEFORM (AT DVD) (INSERT DVD ) 1.FDO 2.F+ 3.F- - 3-10 -...

  • Page 50: At Power On ,Spindle Signal At Md Deck

    AT POWER ON ,SPINDLE SIGNAL AT MD DECK 1.Spind 2.Spin+ 3.Spin- AT FIRST ACTION,FOCUS SIGNAL A,B,C,D - 3-11 -...

  • Page 51: Tracking Signal

    TRACKING SIGNAL 1.Tro 2.Tr- 3.Tr+ RF WAVEFORM - 3-12 -...

  • Page 52: Disk Type Jugement Waveform

    DISK TYPE JUGEMENT WAVEFORM (DVD) 1.F+ 2.FDO 3.SVRRF (CD) - 3-13 -...
  • Page 53 - 3-14 -...

  • Page 54: Dvd Schematic Diagrams

    ❏ DVD SCHEMATIC DIAGRAMS • MPEG SCHEMATIC DIAGRAM 3-15 3-16...

  • Page 55: Rf & Servo Schematic Diagram

    • RF & SERVO SCHEMATIC DIAGRAM 3-17 3-18...

  • Page 56: Interface Schematic Diagram

    • INTERFACE SCHEMATIC DIAGRAM 3-19 3-20...

  • Page 57: Usb Schematic Diagram

    • USB SCHEMATIC DIAGRAM 3-21 3-22...
  • Page 58 ❏ PRINTED CIRCUIT DIAGRAMS • DVD P.C. BOARD 3-23 3-24...
  • Page 59 • DVD P.C. BOARD 3-25 3-26...

  • Page 60: Section 4. Exploded Views

    SECTION 4. EXPLODED VIEWS ❏ CABINET AND MAIN FRAME SECTION...
  • Page 61 ❏ TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION 6720AG0013A DECK,AUDIO CWN42FR605 TOKYO PIG 6768RZUP01A DECK MECHANISM PARTS 50-093-4XXXX PIGEON UNIT PC 6768R-EP05A DECK MECHANISM PARTS 50-093-41234 PIGEON HEAD ASSY 6768RZBP04A DECK MECHANISM PARTS 02-083-4266 ÄPIGEON BELT/FEC...

  • Page 62: Tape Deck Mechanism (A/R & A/S : Right A/R Deck)

    ❏ TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION 6720AG0013A DECK,AUDIO CWN42FR605 TOKYO PIG 6768RZHP02A DECK MECHANISM PARTS ASSY B-DECK PIGEON HEAD 6768R-PP03A DECK MECHANISM PARTS 33-160-4309 PIGEON PRESS CASSE 6768RZGP03A...
  • Page 63 ❏ DECK MECHANISM EXPLODED VIEWS LOCA. NO. PART NO. DESCRIPTION SPECIFICATION 4405RCS007E MECHANISM ASSEMBLY DVM-H1523(DP-9 SS P/UP)DVD 3 3041RBD003H BASE ASSEMBLY PU (DVM-H1533 DP-10 SS P/UP) H 5040R-0110A RUBBER DVD REAR DP8 RIGHT 20 OTHER BL 012A 5040R-0110A RUBBER DVD REAR DP8 RIGHT 20 OTHER BL 4681R-B009C MOTOR ASSEMBLY DECK/MECHA DP-10 FEEDING...

  • Page 64: Section 5. Speaker Section

    SECTION 5. SPEAKER SECTION ❏ MODEL: LMS-K3960V RIGHT LEFT - 5-1 -...
  • Page 65 - 5-2 -...

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