LG LM-M1030A Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. CD Player
  5. LM-M1030A
  6. Service manual
LG LM-M1030A Service Manual

LG LM-M1030A Service Manual

3cd changer hi-fi system
Hide thumbs Also See for LM-M1030A:
Table of Contents

Advertisement

Quick Links

REVISION
3CD CHANGER
HI-FI SYSTEM
SERVICE MANUAL
MODEL: LM-M1030A/D/X, LMS-M1030

Advertisement

Table of Contents
loading

Related Manuals for LG LM-M1030A

Summary of Contents for LG LM-M1030A

  • Page 1 REVISION 3CD CHANGER HI-FI SYSTEM SERVICE MANUAL MODEL: LM-M1030A/D/X, LMS-M1030...

  • Page 2: Table Of Contents

    CONTENTS SECTION 1. GENERAL • SERVICING PRECAUTIONS • ESD PRECAUTIONS • SPECIFICATIONS SECTION 2. ELECTRICAL • ADJUSTMENTS • TROUBLESHOOTING • WAVEFORMS OF MAJOR CHECK POINT 2-15 • BLOCK DIAGRAM 2-27 • SCHEMATIC DIAGRAMS 2-29 • WIRING DIAGRAM 2-37 • PRINTED CIRCUIT DIARGAMS 2-39 •...

  • Page 3: Section 1. General

    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. Storage in conductive bag Drop 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: Specifications

    ❏ SPECIFICATIONS LM-M1030A/D/X LMS-M1030 - 1-5 -...
  • Page 7 MEMO - 1-6 -...

  • Page 8: Section 2. Electrical

    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 3. RECORD BIAS ADJUSTMENT Deck Mode Test Tape Test Point Adjustment Adjust for ERASE HEAD 60kHz±5kHz (Auto stop) Rec/Pause MTT-5511 L203 WIRE(PN202) 85kHz±5kHz(Auto Reverse) Record/Playback PN202 Frequency Counter Head and Pause Mode Test Tape Unit MTT-5511 Record/Playback head Figure 3. Record Bias Adjustment Connection Diagram - 2-2 -...

  • Page 10: Troubleshooting

    ❏ TROUBLESHOOTING • CD PART TURN ON CD OPEN CLOSE CHECK CONNECTOR CHECK ( PN808,PN807 ) CHECK POWER SUPPLY CIRCUIT( PN808 ) CHECK MICOM INTERFACE CIRCUIT( PN807 ) “ READING ” DISPLAY CHECK CONNECTOR CHECK ( PN808,PN807,PN802,PN801 ) CHECK MICOM INTERFACE CIRCUIT( PN807 ) READING OK CHECK CONNECTOR CHECK(PN801,PN802) CHECK PICKUP MOVEMENT...
  • Page 11 • OPEN CLOSE NG CONNECTOR LOCKING CHECK ( PN808,PN807 ) CHECK POWER SUPPLY CIRCUIT( PN808 ,PN807) DEFECTIVE MAIN PN808 PIN 5 = 6.2V, PIN 7 = 5V POEWR SUPPLY PN807 PIN 1 = 5V DEFECTIVE MICOM CHECK VOLTAGE CHANGE OF OPEN CLOSE , AND BTLMUTE VOLTAGE(= 5V) (PN807 PIN 20:OPEN, 19:CLOSE, 4:BTLMUTE) CHECK VOLTAGE CHANGE LO+, LO- OF IC803...
  • Page 12 • “ READING ” DISPLAY CHECK (= ONLY “CD “DISPLAY) CONNECTOR LOCKING CHECK (PN808,PN807,PN802,PN801 ) CHECK POWER SUPPLY CHECK POWER SUPPLY DEFECTIVE CONNECTOR OR PORT( PN808 ,PN807) PORT( PN808 ,PN807) MAIN POWER SUPPLAY PN808 PIN 5 = 6.2V, PIN 7 = 5V PN808 PIN 5 = 6.2V, PIN 7 = 5V PN807 PIN 1 = 5V PN807 PIN 1 = 5V...
  • Page 13 • READING OK CHECK (= “NO DISC” DISPLAY) CONNECTOR LOCKING CHECK(PN801,PN802) DOES SLED MOVE ? A A A A CHECK PN802 PIN 3,4( SL+,SL-) DEFECTIVE PICKUP OR DEFECTIVE PICKUP OR IC803 OR IC801 OR IC802 IC803 OR IC801 OR IC802 DOES LENSE MOVE ? (= UP &...
  • Page 14 • READING OK CHECK #A (= “NO DISC” DISPLAY) A A A A DOES SL+ WAVEFORM APPEAR AT ( IC803 PIN14 AND PN802 PIN3) WAVEFORM #2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT DEFECTIVE IC801 ( IC803 PIN 5) WAVEFORM #2 SLED DRIVE WAVE DEFECTIVE IC803...
  • Page 15 • READING OK CHECK #B (= “NO DISC” DISPLAY) B B B B DOES FA+ WAVEFORM APPEAR AT ( IC803 PIN15 AND PN801 PIN16) WAVEFORM #3 FOCUS COIL DRIVE WAVE DOES FAIN- WAVEFORM APPEAR AT DEFECTIVE IC801 ( IC803 PIN 26) WAVEFORM #3 FOCUS DRIVE WAVE DEFECTIVE IC803...
  • Page 16 • READING OK CHECK #C (= “NO DISC” DISPLAY) C C C C IS ?V APPLIED TO PIN10 OF PN801 LASER SUPPLY VOLTAGE CHECK IS 3.3 V APPLIED TO PIN3 OF IC802 RF IC SUPPLY VOLTAGE DEFECTIVE IC805 CHECK IS 2.0 V PIN2 OF IC802 DEFECTIVE IC802 LASER CONTROL VOLTAGE CHECK...
  • Page 17 • READING OK CHECK #D (= “NO DISC” DISPLAY) D D D D DOES SP+ WAVEFORM APPEAR AT ( IC803 PIN12 AND PN802 PIN6)WAVEFORM #4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT( IC803 PIN 6) DEFECTIVE IC801 WAVEFORM #4 SPINDLE DRIVE WAVE DEFECTIVE IC803 DEFECTIVE PN802...
  • Page 18 • READING OK CHECK # E (= “NO DISC” DISPLAY) E E E E DOES TA+ WAVEFORM APPEAR AT ( IC803 PIN17 AND PN801 PIN15) WAVEFORM #5 TRACKING COIL DRIVE WAVE DOES TAIN- WAVEFORM APPEAR AT DEFECTIVE IC801 ( IC803 PIN 23) WAVEFORM #5 TRACKING DRIVE WAVE DEFECTIVE IC803...
  • Page 19 • CD PART VOLTAGE SHEET PIN NO. STOP CD-DA PLAY MP3 PLAY PIN NO. STOP CD-DA PLAY MP3 PLAY IC801 MN6627933CG - 2-12 -...
  • Page 20 PIN NO. STOP CD-DA PLAY MP3 PLAY PIN NO. STOP CD-DA PLAY MP3 PLAY IC802 IC803 AN22004A BA5810FP 0 (*CD-RW: 3.0) 0 (*CD-RW: 3.0) 0 (*CD-RW: 3.0) - 2-13 -...
  • Page 21 PIN NO. STOP CD-DA PLAY MP3 PLAY PIN NO. STOP CD-DA PLAY MP3 PLAY IC804 IC805 M12L16161A UTC LD1117A 2 4.77 - 2-14 -...

  • Page 22: Waveforms Of Major Check Point

    • CD PART WAVEFORMS OF MAJOR CHECK POINT # X. MICOM IN TERFACE WAVEFORM #2. S LED DRIVE AND MOTOR WAVEFORM (PN807 pin XX, X3, X4, X5) d uring normal play (IC803 pin 5, X4) wh en foc us se arch IC803: SLI N PN807: ST AT PN807: MDATA...
  • Page 23 #4. SPINDL E DRIVE AND MOTOR WAVEFORM #5. T RACK DRIVE AND MOTOR WAVEFORM (IC803 pin 6, 2) wh en TOC reading (TP860, IC8 03 pin 23) durin g normal p lay TP 860 IC803: SP IN IC803: T A+ IC803: SP + #6.
  • Page 24 • MAIN SET P-SENS PART Does +5V appear at ZD901(+)? Check the waveform of D913(+). Replace D913 Check the pattern of Check R943 and replace IC301 Pin ZD901 VKK PART Does DC - 33V appear at CN302 Pin Dose -33V appear at ZD902(-) Replace the ZD902 Check Q903...
  • Page 25 Power Circuit Check the Fuse Replace the Fuse Check the AC Output of Check the DC output Replace the Transformer CN901 pin1, 5 of C901(+), C951(-) Replace the D901, D902, D903, D904 Check the DC Output of C903(+) Check the AC Output of Replace the Transformer CN701 PIN 1, 9, 10 Check the output of...
  • Page 26 Muting circuit (MUTE) Refer to IC202 Troubleshooting Dose “Low” appear at (ONLY Q201, Q251) Q602 “B” Check the connector of Q602 “B” & GND Check the “HIGH of” Q601, Q651 “B” MUTE Audio abnormal Check the output of IC601 Pin 24, 25 Refer to “IC601 Troubleshooting”...
  • Page 27 FUNCTION MODE Audio abnormal TAPE Check the signal input of IC601 pin 28, 37 Refer to IC202 Troubleshooting Check the signal input of IC601, pin 29, 36 Check the signal input of JK102 Check the signal input of IC601 pin 31, 34 Check the signal of CN513 pin1, 3 or Refer to CD Troubleshooting Tuner...
  • Page 28 IC301 Troubleshooting Check the power supplying IC301 Pin 31, 32, 51, 88? Refer to Power Circuit Troubleshooting Check the 5V of IC301 pin6 Check the P-SENS Check the oscillation of X301 Replace X301 Check the “Low” © “High” of IC301 pin88 when power supplied Check the RESET circuit Replace IC301...
  • Page 29 IC601 Troubleshooting Check the power supplied to IC601 pin39 Refer to “Power Circuit Troubleshooting” Check the Pulse waveform of IC601 pin21, 22(VOL DIAL) Check the IC301 pin 15, 16, 75, 76 Replace the “IC301 Check the Output of IC601 pin 24, 25 Troubleshooting”...
  • Page 30 Play Check the VCC supply to IC202 pin 18 Refer to Power Circuit Troubleshooting Check the signal output of IC202 pin 5, 20 Check the Deck Mechanism Replace the Deck Check the Muting Circuit Mechanism Replace the IC202 Dubbing(NORMAL or REC // HIGH) Q252, 202 OFF // ON : R273, 223 LOW // HIGH Q253, 203 ON // OFF...
  • Page 31 REC (Q252, Q202 ON / R273, R223 High) Check signal supplied to IC202 pin 11, 14? Check the “Low” of Q253, Q203 “B” Refer to IC203 Troubleshooting Replace Q253, Q203 Check the output of IC202 Pin 9, 16 Check the Vcc power of IC202 Pin18 Check the IC201 pin 6 : 12V and pin 4 : High Check the power or Refer to IC203 Troubleshooting...
  • Page 32 • CD MAIN P.C. BOARD (COMPONENT SIDE) - 2-25 -...
  • Page 33 • CD MAIN P.C. BOARD (SOLDER SIDE) - 2-26 -...

  • Page 34: Block Diagram

    ❏ BLOCK DIAGRAM NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock. 2-25 2-26...

  • Page 35: Schematic Diagrams

    ❏ SCHEMATIC DIAGRAMS NOTE: Warning NOTE: Parts that are shaded are critical With respect Shaded(I) parts are critical for safety.Replace only • MAIN SCHEMATIC DIAGRAM to risk of fire or electrical shock. with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.
  • Page 36 • FRONT SCHEMATIC DIAGRAM 2-29 2-30...
  • Page 37 • TUNER/DECK SCHEMATIC DIAGRAM 2-31 2-32...
  • Page 38 • CDP SCHEMATIC DIAGRAM 2-33 2-34...

  • Page 39: Wiring Diagram

    ❏ WIRING DIAGRAM NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock. 2-35 2-36...

  • Page 40: Printed Circuit Diargams

    ❏ PRINTED CIRCUIT DIAGRAMS • MAIN MIC P.C. BOARD (SOLDER SIDE) 2-37 2-38...
  • Page 41 • MAIN MIC P.C. BOARD (COMPONENT SIDE) 2-39 2-40...
  • Page 42 • FRONT P.C. BOARD(COMPONENT SIDE) 2-41 2-42...
  • Page 43 • FRONT P.C. BOARD(SOLDER SIDE) 2-43 2-44...
  • Page 44 • CD MAIN P.C. BOARD (COMPONENT SIDE) • CD MAIN P.C. BOARD (SOLDER SIDE) 2-45 2-46...
  • Page 45 • POWER P.C. BOARD NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock. 2-47 2-48...

  • Page 46: Internal Block Diagram Of Ics

    ❏ INTERNAL BLOCK DIAGRAM OF ICs I BA5810FP (IC803) - 2-49 -...
  • Page 47 I KIA 78R12 PI (IC903) 4 TERMINAL LOW DROP VOLTAGE REGULATOR The KIA78RXX Series are Low Drop Voltage Regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220 4 termainal lead full molded PKG. The Regulator has multi function such as over current protection, overheat protection and ON/OFF control.
  • Page 48 Block Diagram I KIA7805AP/API (IC901) THREE TERMINAL POSITIVE VOLTAGE REGULATORS 5V, 6V, 8V, 9V, 10V, 12, 15V, 18V, 24V. EQUIVALENT CIRCUIT - 2-51 -...
  • Page 49 Block Diagram I KIA7805AP/API (IC901) THREE TERMINAL POSITIVE VOLTAGE REGULATORS 5V, 6V, 8V, 9V, 10V, 12, 15V, 18V, 24V. EQUIVALENT CIRCUIT - 2-52 -...
  • Page 50 I BA3126N (IC201) 2-channel head switch for radio cassette recorders - 2-53 -...
  • Page 51 I BU2090F (IC501) 12-bit, Serial IN, Parallel OUT driver Block diagram Control circuit DATA 12-bit shift register CLOCK Latch Output buffer (open drain) PIN DESCRIPTION Pin No. Pin name Function BU2090/F/FS BU2092/F BU2092/FV DATA Serial data input CLOCK Data shift clock input Data latch clock input parallel data output parallel data output...
  • Page 52 I KIA4558P/S (IC602) BIPOLAR LINEAR INTEGRATED CIRCUIT - 2-55 -...
  • Page 53 I KA3082 (IC804) Bi-Directional DC Motor Driver Description The KA3082 is a monolithic integrated circuit designed for driving bi-directional DC motor with braking and speed control. - 2-56 -...
  • Page 54 I KIA7812API (IC902) BIPOLAR LINEAR INTEGRATED CIRCUIT FEATURES • Suitable for C-MOS, TTL, the Other Digital IC’s Power Supply • Internal Thermal Overload Protection. • Internal Short Circuit Current Limiting - 2-57 -...

  • Page 55: Repairs Regarding Cd Mechanism

    ❏ REPAIRS REGARDING CD MECHANISM I IMPROVED METHOD - WHEN THE TRAY GEARS WERE DISTORTED BASE MAIN GEAR PU DOWN GEAR MAIN GEAR CAM TRAY LOADING PICK UP 1. How to open the tray ➀ ➁ Push two hooks (H) of the BASE MAIN, and open the TRAY LOADING 2.

  • Page 56: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS NOTE) Refer to “SECTION 5 REPLACEMENT PARTS LIST” in order to look for the ❏ CABINET AND MAIN FRAME SECTION part number of each part. TUNER...
  • Page 57 • TAPE DECK MECHANISM DOUBLE AUTO REVERSE DECK (RIGHT) 037R LOCA.NO PART NO. SPECIFICATION 6720AG0003C CWM42RR48 TOKYO PIGEON L-DOUBLE 6768R-UP03D 50-093-4895 PIGEON PWB UNIT CW 6768R-BP03D 02-083-4254 PIGEON BELT/FELT C 002L 6768R-BP03F 02-083-4232 PIGEON BELT/FELT C 002R 6768R-BP03E 02-083-4256 PIGEON BELT/FELT C 6768R-PP03A 33-160-4309 PIGEON PRESS CASSE 6768R-QP03C...
  • Page 58 • TAPE DECK MECHANISM: DOUBLE AUTO REVERSE DECK (LEFT) 037L LOCA.NO PART NO. SPECIFICATION 6720AG0003C CWM42RR48 TOKYO PIGEON L-DOUBLE 6768R-UP03D 50-093-4895 PIGEON PWB UNIT CW 002L 6768R-BP03D 02-083-4254 PIGEON BELT/FELT C 002L 6768R-BP03F 02-083-4232 PIGEON BELT/FELT C 002R 6768R-BP03E 02-083-4256 PIGEON BELT/FELT C 6768R-PP03A 33-160-4309 PIGEON PRESS CASSE 6768R-QP03C...

  • Page 59: Cd Mechanism

    ❏ CD MECHANISM LOCA.NO. PART NO DESCRIPTION SPECIFICATION 4405RCE008C MECHANISM ASSEMBLY CDM-H1503 3 CD CHANGER 3041RB0002C BASE ASSEMBLY PU(SPRING DAMPER) 6717RCA001A PICK UP ASSY KSM-213VSCM SONY FRONT LOADING 3390RB0002A TRAY DISC(CDM-H1503) 4470RB0005A GEAR TRAY (CDM-H1503) 4681RBA001A MOTOR ASSEMBLY TRAY (CDM-H1503) 6871RF9211A PWB(PCB) ASSEMBLY,FRONT 1503 T/D SENSOR 3390RB0001A TRAY...

  • Page 60: Section 4. Speaker

    SECTION 4. SPEAKER SECTION ❏ MODEL: LMS-M1030 - 4-1 -...
  • Page 61 MEMO - 4-2 -...

This manual is also suitable for:

Lm-m1030dLm-m1030xLms-m1030

Table of Contents