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LG LAC-M7600 Service Manual

Car cd/mp3/wma receiver
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CAR CD/MP3/WMA Receiver
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
MODELS:LAC-M7600R/LAC-M7600
P/N : AFN30086098
APRIL, 2006

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  Summary of Contents for LG LAC-M7600

  • Page 1 CAR CD/MP3/WMA Receiver SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODELS:LAC-M7600R/LAC-M7600 P/N : AFN30086098 APRIL, 2006...
  • Page 2 [CONTENTS] ❍ SECTION 1.GENERAL • SERVICING PRECAUTIONS ..........1-2 •...
  • Page 3: Section 1. Summary

    SECTION 1. SUMMARY ❏ SERVICING PRECAUTIONS ❶ Always disconnect the power source before: 1) Removing or reinstalling any component, circuit board, module or any other instrument assembly. 2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection. 3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.
  • Page 4: 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 5: Specifications

    ❏ SPECIFICATIONS MP3/WMA Disc compatibility with this unit is limited as follows: 1. Sampling Frequency/8 - 48kHz (MP3) 22.05 - 48kHz (WMA) 2. Bit rate/within 8 - 320kbps (include VBR) (MP3) 32 - 320kbps (WMA) 3. CD-R/CD-RW file system should be “ISO 9660” 4.
  • Page 6: Section 2. Electrical

    SECTION 2. ELECTRICAL ❏ ELECTRICAL TROUBLESHOOTING GUIDE 1. No Power. Any Key power on. Check power supply circuitry. Q722, Q727, IC702, Q723, Q805, Is power turnd on? Q806, Q720, Q719, IC701 Check loading supply circuitry. DISC loading? Q701, Q702, Q703, Q704, PN503, Q503, IC508 Check laser circuitry.
  • Page 7 2. VFD light abnornal. Any Key power on. (without DISC) Power supply circuitry defective. Check voltage in the power Do display VFD then light? Q601, Q602, IC602, T901 supply circuitry. Is u-com IC102 reset circuit • Reset circuit defective. normal? IC102-74Pin IC903 Surrounding circuit defective.
  • Page 8 3. Initial reading is not carried out. Defective Check the Voltage change of Slide motor moves connector CN503 PN502 Pin1 (6.4~6.8V) (With disc) Check the Voltage IC506 Defective IC506 Pin23 (1.4V~1.8V) Spindle motor turns Check the Data transmission WAVEFORM #1 from IC510 (58, 72, 70) Defective MICOM DSP WAVEFORM #5...
  • Page 9: Open Close

    When laser does not light. Is “2.4V~3.4V” applied to pin42 of IC506? ➀ 3.4V ➁ 2.4V) Did pickup return to Is data transferred Defective MICOM (IC510) innermost circular? from IC510 Does voltage appear at Defective IC506. IC504 Pin 13, 14? Defective slide motor and/or connector.
  • Page 10 When laser light. Laser lights Check the signal FOCUS Defective IC506 SEARCH of IC506 Pin25 WAVEFORM #3 Check the signal of IC504 Pin 15, 16 Defective IC506 WAVEFORM #3 Degraded laser diode Defective PICK-UP When SPINDLE motor dose not turn Check the change for SPDO Voltage Defective IC506...
  • Page 11: Waveforms Of Major Check Point

    ❏ WAVEFORMS OF MAJOR CHECK POINT #1. SPINDLE DRIVE AND MOTOR WAVEFORM #2. RF WAVEFORM IC501(21), IC502(12) during TOC reading IC506(45), IC506(49) during TOC reading #3. FOCUS DRIVE AND MOTOR WAVEFORM IC506(25), IC504(15) • When focus search failed or there is no disc on tray •...
  • Page 12: Internal Block Diagram Of Ics

    ❏ INTERNAL BLOCK DIAGRAM of ICs FRONT 1) MICOM PIN Assignment - 2-7 -...
  • Page 13: Pin Descriptions

    2) Pin Descriptions - 2-8 -...
  • Page 14 - 2-9 -...
  • Page 15 3) Pin Descriptions - 2-10 -...
  • Page 16 TB2903HQ 1) Block Diagram OUT1 (+) PW-GND1 OUT1 ( ) OUT2 (+) PW-GND2 OUT2 ( ) AC-GND OUT3 (+) PW-GND3 OUT3 ( ) OUT4 (+) PW-GND4 OUT4 ( ) PRE-GND Off-set STBY MUTE PLAY MUTE : PRE-GND : PW-GND - 2-11 -...
  • Page 17 78K0/KF2 1) Block Diagram - 2-12 -...
  • Page 18: Pin Layout

    2) Pin Lay Out 80 79 78 77 76 75 7473 72 71 70 69 68 67 66 65 6463 62 61 P120/INTPO/EXLVI AVSS AVREF P10/SCK10/TXD0 P11/SI10/RXD0 P12/SO10 80pin QFP RESET P13/TXD6 P124/XT2/EXCLKS P14/RXD6 P123/XT1 P15/TOH0 IC/FLMD0 P16/TOH1/INTP5 P122/X2/EXCLK P17/TI50/TO50 P121/X1 P30/INTP1 REGC...
  • Page 19: Pin Function

    3) Pin Function - 2-14 -...
  • Page 20 AM5810 1) Block Diagram - 2-15 -...
  • Page 21 3) Pin Function - 2-16 -...
  • Page 22 MN6627954 1) Pin Lay Out 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 DVDD2 ARFFB IOVDD1 ARFOUT DVSS2 ARFDC NTEST2 AVDO2 RF IN RFOUT MTEST RFENV...
  • Page 23 2) Block Diagram NTEST2 NTEST TIMING MICRO COMPUTER DSL / PLL / VCO NSRVMONON * TXTCK GENERATOR INTERFACE [DSLPLL] [GEN] NRST [MCIF] * TXTD * DQSY SPINDLE SUBCODE EFM DEMODULATION AVDD2 (SBCK) SERVO INTERFACE AVSS2 SYNC INTERPOLATION [SPD] (SUBC) [DEMECC] A,B,C,D,E,F CIRC ECC CDROM ECC...
  • Page 24 3) Pin Function Pin no. Symbol Function Adress signal output for DRAM11 Adress signal output for DRAM9 Adress signal output for DRAM8 Adress signal output for DRAM7 Adress signal output for DRAM6 Adress signal output for DRAM5 Adress signal output for DRAM4 Writing enable signal output for DRAM NCAS CAS control signal output for DRAM...
  • Page 25 TDA7416 1) pin description 44 43 42 41 38 37 36 35 34 N.C. ACINR N.C. ACOUTL AUXR ACINL PDL+ VREFOUT AC2INL N.C. AC2OUTL PDR+ FILOL N.C. OUTLF OUTLR N.C. N.C. 12 13 14 15 16 18 19 20 21 22 TQFP44 - 2-20 -...
  • Page 26: Block Diagram

    ❏ BLOCK DIAGRAM 2-21 2-22...
  • Page 27: Schematic Diagrams

    ❏ SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM 2-23 2-24...
  • Page 28 • MAIN-2 SCHEMATIC DIAGRAM 2-25 2-26...
  • Page 29 • MAIN-3 SCHEMATIC DIAGRAM 2-27 2-28...
  • Page 30 • MAIN-4 SCHEMATIC DIAGRAM 2-29 2-30...
  • Page 31 • FRONT SCHEMATIC DIAGRAM 2-31 2-32...
  • Page 32 • CD SCHEMATIC DIAGRAM 2-33 2-34...
  • Page 33 • TRIM SCHEMATIC DIAGRAM 2-35 2-36...
  • Page 34: Printed Circuit Board Diagrams

    ❏ PRINTED CIRCUIT BOARD DIAGRAMS • MAIN P.C. BOARD DIAGRAM 2-37 2-38...
  • Page 35 • MAIN P.C. BOARD DIAGRAM 2-39 2-40...
  • Page 36 • FRONT/TRIM P.C. BOARD DIAGRAM • TRIM P.C. BOARD 2-41 2-42...
  • Page 37 • CD P.C. BOARD 2-43 2-44...
  • Page 38: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS ❏ CABINET AND MAIN FRAME SECTION *Accessory...
  • Page 39: Mechanism (Pick-Up)

    ❏ MECHANISM (PICK-UP)

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Lac-m7600r