LG LX-M150A Service Manual
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LG LX-M150A Service Manual

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MICRO COMPONENT
SYSTEM
MODEL : LX-M150A/D, LXS-M150

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Summary of Contents for LG LX-M150A

  • Page 1 MICRO COMPONENT SYSTEM MODEL : LX-M150A/D, LXS-M150...

  • Page 2: Table Of Contents

    [CONTENTS] SECTION 1. GENERAL • SERVICING PRECAUTIONS .....................1-2 • ESD PRECAUTIONS........................1-4 • SPECIFICATION .........................1-5 SECTION 2. ELECTRICAL • ADJUSTMENTS ..........................2-1 • WAVEFORMS OF MAJOR CHECK POINT................2-2 • TROUBLESHOOTING ........................2-4 • BLOCK DIAGRAM ........................2-19 • SCHEMATIC DIAGRAMS ......................2-21 • WIRING DIAGRAM ........................2-29 •...

  • 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 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: Specification

    SPECIFICATIONS SECTION MODEL LX-M150A/D/X Power supply Refer to the back panel of the unit Power consumption General Mass External dimensions(WxHxD) 146x238x251mm Frequency Response 40 ~ 18000Hz Signal-to-noise ratio 60dB Dynamic Range 60dB Tuning Range 87.5 ~ 108.0MHz or 65 ~74MHz, 87.5 ~ 108.0MHz Intermediate Frequency 10.7MHz...
  • Page 7 MEMO - 1-6 -...

  • Page 8: Adjustments

    SECTION 2. ELECTRICAL ADJUSTMENTS This set has been aligned at the factory and normally will not require further adjustment. As a result, it is not recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers with the adjustment, realignment may be necessary.

  • Page 9: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT - 2-2 -...
  • Page 10 #4. SPINDLE DRIVE AND MOTOR WAVEFORM #5. TRACK DRIVE AND MOTOR WAVEFORM (IC503 pin6, 12) when TOC reading (TP560, IC503 pin23) during normal play #6. RF, TRACKING AND FOCUS ERROR WAVEFORM (IC502 pin8, 21, 23) during normal play - 2-3 -...

  • Page 11: Troubleshooting

    TROUBLESHOOTING • CD PART CD FUNC. ON CLOSE CHECK CHECK POWER SUPPLY CIRCUIT(PN508) CHECK MICOM INTERFACE CIRCUIT(PN507) CN502 CHECK “ READING ” DISPLAY CHECK CONNECTOR CHECK (PN508, PN507, PN503, PN501) CHECK MICOM INTERFACE CIRCUIT(PN507) READING OK CHECK CONNECTOR CHECK(PN501, PN503) CHECK PICKUP MOVEMENT CHECK SA5810FP (IC503) CHECK MN6627933CG (IC501)
  • Page 12 • “READING” DISPLAY CHECK (= ONLY “CD” DISPLAY) CONNECTOR LOCKING CHECK (PN508, PN507, PN503, PN501 ) CHECK POWER SUPPLY DEFECTIVE CONNECTOR OR PORT( PN508, PN507) MAIN POWER SUPPLAY PN508 PIN 8 = 6.2V, PIN 7 = 5V PN507 PIN 1 = 5V CHECK VOLTAGE THE PIN 2 OF IC505 DEFECTIVE IC505 IC505 PIN2 : 3.3V...
  • Page 13 • READING OK CHECK (= “NO DISC” DISPLAY) CONNECTOR LOCKING CHECK(PN501, CN503) DOES SLED MOVE? CHECK CN503 PIN 3, 4(SL+, SL-) DEFECTIVE PICKUP OR IC503 OR IC501 OR IC502 DOES LENSE MOVE? (= UP & DOWN) CHECK PN501 PIN 13, 16 DEFECTIVE PICKUP OR (FA-, FA+) IC503 OR IC501...
  • Page 14 • READING OK CHECK #A (= “NO DISC” DISPLAY) DOES SL+ WAVEFORM APPEAR AT (IC503 PIN14 AND CN503 PIN3) WAVEFORM #2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT DEFECTIVE IC501 (IC503 PIN 5) WAVEFORM #2 SLED DRIVE WAVE DEFECTIVE IC503 DEFECTIVE CN503 CHECK CN503 CONNECTOR LINE CONNECTOR...
  • Page 15 • READING OK CHECK #B (= “NO DISC” DISPLAY) DOES FA+ WAVEFORM APPEAR AT (IC503 PIN15 AND PN501 PIN16) WAVEFORM #3 FOCUS COIL DRIVE WAVE DOES FAIN- WAVEFORM APPEAR AT DEFECTIVE IC501 (IC503 PIN 26) WAVEFORM #3 FOCUS DRIVE WAVE DEFECTIVE IC503 DEFECTIVE PN501 CHECK PN501 CONNECTOR LINE...
  • Page 16 • READING OK CHECK #C (= “NO DISC” DISPLAY) IS VOLTAGE APPLIED TO PIN10 OF PN501? (LASER SUPPLY VOLTAGE CHECK) IS 3.3 V APPLIED TO PIN3 OF IC502 RF IC SUPPLY VOLTAGE DEFECTIVE IC505 CHECK IS 2.0 V PIN2 OF IC502K DEFECTIVE IC502 LASER CONTROL VOLTAGE CHECK...
  • Page 17 • READING OK CHECK #D (= “NO DISC” DISPLAY) DOES SP+ WAVEFORM APPEAR AT (IC503 PIN12 AND PN503 PIN6) WAVEFORM #4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT DEFECTIVE IC501 (IC503 PIN 6) WAVEFORM #4 SPINDLE DRIVE WAVE DEFECTIVE IC503 DEFECTIVE PN503 CHECK PN503 CONNECTOR LINE...
  • Page 18 • READING OK CHECK # E (= “NO DISC” DISPLAY) DOES TA+ WAVEFORM APPEAR AT (IC503 PIN17 AND PN503 PIN15) WAVEFORM #5 TRACKING COIL DRIVE WAVE DOES TAIN- WAVEFORM APPEAR AT DEFECTIVE IC501 (IC503 PIN 23) WAVEFORM #5 TRACKING DRIVE WAVE DEFECTIVE IC503 DEFECTIVE PN503 CHECK PN503 CONNECTOR LINE...
  • Page 19 • AUDIO PART - 2-12 -...
  • Page 20 - 2-13 -...
  • Page 21 Check the signal input CN201, PN201 check of IC601 pin3, 26 IC201 Pin4, 11 check IC601 pin12, 17 output Check signal input JK602 IC601 pin12, 17 output IC601 pin12, 17 output IC102 pin17, 18 check IC601 pin12, 17 output - 2-14 -...
  • Page 22 - 2-15 -...
  • Page 23 - 2-16 -...
  • Page 24 - 2-17 -...
  • Page 25 Check PN201, Q201 IC201 signal check pin4, 11 PN202 check SW201 check Audio output (PN201 pin8, 9) Check the signal output of IC201 pin4, 11 Check the PN201 pin6, 7 - 2-18 -...

  • Page 26: Block Diagram

    BLOCK DIAGRAM - 2-19 - - 2-20 -...
  • Page 27 SCHEMATIC DIAGRAMS • FRONT/POWER SCHEMATIC DIAGRAM - 2-21 - - 2-22 -...

  • Page 28: Schematic Diagrams

    • MAIN/DECK SCHEMATIC DIAGRAM - 2-23 - - 2-24 -...
  • Page 29 • TUNER SCHEMATIC DIAGRAM - 2-25 - - 2-26 -...
  • Page 30 • CDP SCHEMATIC DIAGRAM - 2-27 - - 2-28 -...

  • Page 31: Wiring Diagram

    WIRING DIAGRAM - 2-29 - - 2-30 -...

  • Page 32: Printed Circuit Diagrams

    PRINTED CIRCUIT DIAGRAMS • FRONT/POWER P.C. BOARD (Top View) • FRONT/POWER P.C. BOARD (Bottom View) - 2-31 - - 2-32 -...
  • Page 33 • MAIN/DECK P.C. BOARD (Top View) - 2-33 - - 2-34 -...
  • Page 34 • MAIN/DECK P.C. BOARD (Bottom View) - 2-35 - - 2-36 -...
  • Page 35 • CDP P.C. BOARD - 2-37 - - 2-38 -...

  • Page 36: Internal Block Diagram Of Ics

    INTERNAL BLOCK DIAGRAM OF ICs IC300 LC87F73C8A 1) Pin Assignment - 2-39 -...
  • Page 37 IC601 TDA7468D 1) BLOCK DIAGRAM - 2-40 -...
  • Page 38 2) PIN CONNECTION - 2-41 -...
  • Page 39 IC301 BU1923 1) BLOCK DIAGRAM - 2-42 -...
  • Page 40 IC102LA1837 1) BLOCK DIAGRAM 2) Test Circuit Diagram - 2-43 -...
  • Page 41 IC103 LC72131D 1) Pin Assignments - 2-44 -...
  • Page 42 IC201 AN7312 1) BLOCK DIAGRAM IC701 LA4631 1) BLOCK DIAGRAM - 2-45 -...
  • Page 43 IC504 M12L16161A 1) Synchronous DRAM • PIN Definitions NAME INPUT FUNCTION System Clock Active on the positive going edge to sample all inputs. Chip Select Disables or enables device operation by masking or enabling all inputs except CLK, CKE and L(U)DQM. Clock Enable Masks system clock to freeze operation from the next clock cycle.

  • Page 44: Cabinet And Main Frame Section

    SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION NOTE) Refer to “SECTION 5 REPLACEMENT PARTS LIST” in order to look for the part number of each part. T901 - 3-1 - - 3-2 -...
  • Page 45 MEMO MEMO - 3-3 - - 3-4 -...

  • Page 46: Section 4. Speaker

    SECTION 4. SPEAKER SECTION MODEL: LXS-M150 - 4-1 -...
  • Page 47 MEMO - 4-2 -...

This manual is also suitable for:

Lx-m150dLxs-m150

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