LG LM-M1030D, LM-M1030X, LMS-M1030 Service Manual

SERVICE MANUAL MODEL: LM-M1030A/D/X, LMS-M1030

REVISION

3CD CHANGER HI-FI SYSTEM

SERVICE MANUAL

MODEL: LM-M1030A/D/X, LMS-M1030

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CONTENTS

SECTION 1. GENERAL

• SERVICING PRECAUTIONS 1-2

• ESD PRECAUTIONS 1-4

• SPECIFICATIONS 1-5

SECTION 2. ELECTRICAL

• ADJUSTMENTS 2-1

• TROUBLESHOOTING 2-3

• WAVEFORMS OF MAJOR CHECK POINT 2-15

• BLOCK DIAGRAM 2-27

• SCHEMATIC DIAGRAMS 2-29

• WIRING DIAGRAM 2-37

• PRINTED CIRCUIT DIARGAMS 2-39

• INTERNAL BLOCK DIAGRAM OF IC’s 2-49

• REPAIRS REGARDING CD MECHANISM 2-58

SECTION 3. EXPLODED VIEWS

• CABINET AND MAIN FRAME SECTION 3-1

• TAPE DECK MECHANISM: AUTO STOP DECK(OPTIONAL) 3-3

• TAPE DECK MECHANISM: AUTO REVERSE DECK 3-5

• CD MECHANISM 3-7

SECTION 4. SPEAKER 4-1

SECTION 5. REPLACEMENT PARTS LIST

5-1

❏ 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. Repair notes

1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board.

3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never be touched.

4) Laser beams may damage the eyes! Absolutely never permit laser beams to enter the eyes! Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

5) Cleaning the lens surface If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort this.

6) Never attempt to disassemble the pick-up. Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

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Storage in conductive bag

Drop impact

NEVER look directly at the laser beam, and don’t let contact fingers or other exposed skin.

Magnet

How to hold the pick-up

Pressure

Cotton swab

Conductive Sheet

SECTION 1. GENERAL

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.

2) The pick-up is composed of many optical components and other high-precision components. Care must be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong magnetism is present, or where there is excessive dust.

2. Notes for repair

1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded. When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1MΩ)

6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent static electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

CLEARING MALFUNCTION

You can reset your unit to initial status if malfunction occur(button malfunction, display, etc.). Using a pointed good conductor(such as driver), simply short the RESET jump wire on the inside of the

volume knob for more than 3 seconds. If you reset your unit, you must reenter all its settings(stations, clock, timer)

NOTE: 1. To operate the RESET jump wire, pull the volume rotary knob and release it.

2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord.

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Armband

Conductive Sheet

Resistor (1 Mohm)

VOLUME KNOB

DOWN

VOLUME

RESET jump wire

❏ 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.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive

surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can

generate electrical charges sufficient to damage ESD devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD

devices.

6. Do not remove a replacement ESD device from its protective package until immediately before you are ready

to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive materials).

7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the

protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER

SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion

such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

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❏ SPECIFICATIONS

LM-M1030A/D/X

LMS-M1030

- 1-6 -

MEMO

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TAPE DECK ADJUSTMENT

1. AZIMUTH ADJUSTMENT

Figure 1. Azimuth Adjustment Connection Diagram

CH1 CH2

Speaker Out

Playback Mode

Head

Test Tape MTT-114

L ch

R ch

GND

Dual-trace synchroscope

Electronic Voltmeter

L out

R out

Unit

❏ 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.

IMPORTANT

1. Check Power-source voltage.

2. Set the function switch to band being aligned.

3. Turn volume control to minimum unless otherwise noted.

4. Connect low side of signal source and output indicator to chassis ground unless otherwise specified.

5. Keep the signal input as low as possible to avoid AGC and AC action.

Deck Mode Test Tape Test Point Adjustment Adjust for

A Deck Playback MTT-114 Speaker Out

DECK Screw

Maximum

Azimuth Screw

B Deck Playback MTT-114 Speaker Out Azimuth Screw Maximum

2. MOTOR SPEED ADJUSTMENT

Figure 2. Motor Speed Adjustment Connection Diagram

Head

Playback Mode

Unit

Speaker Out

GND

L out

R out

Record/Playback head

Test Tape MTT-111

Frequency Counter

Deck Mode Test Tape Test Point Adjustment Adjust for Remark

Normal Speed MTT-111 Speaker Out VR501 3kHz ± 1% A Deck HI-Speed MTT-111 Speaker Out more than 5.4kHz HI-Speed Dubbing Mode

SECTION 2. ELECTRICAL

- 2-2 -

3. RECORD BIAS ADJUSTMENT

Head

Unit

PN202

GND

Record/Playback head

Test Tape MTT-5511

Record/Playback and Pause Mode

Frequency Counter

Deck Mode Test Tape Test Point Adjustment Adjust for

Rec/Pause MTT-5511

ERASE HEAD

L203

60kHz±5kHz (Auto stop)

WIRE(PN202) 85kHz±5kHz(Auto Reverse)

Figure 3. Record Bias Adjustment Connection Diagram

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❏ TROUBLESHOOTING

TURN ON CD

CONNECTOR CHECK ( PN808,PN807 )

CHECK POWER SUPPLY CIRCUIT( PN808 )

CHECK MICOM INTERFACE CIRCUIT( PN807 )

CONNECTOR CHECK(PN801,PN802)

CHECK PICKUP MOVEMENT

CHECK BA5810FP (IC803)

CHECK MN6627933CG (IC801)

CHECK AN22004 (IC802)

CONNECTOR CHECK (PN808)

CONNECTOR CHECK

( PN808,PN807,PN802,PN801 )

OPEN CLOSE CHECK

“ READING ”

DISPLAY CHECK

READING OK CHECK

IF PLAY, AUDIO

OUTPUT CHECK

YES

• CD PART

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• OPEN CLOSE NG

CONNECTOR LOCKING CHECK ( PN808,PN807 )

DEFECTIVE MAIN

POEWR SUPPLY

DEFECTIVE MICOM

DEFECTIVE IC803

DEFECTIVE

MECHANISM

CHECK POWER SUPPLY CIRCUIT( PN808 ,PN807)

PN808 PIN 5 = 6.2V, PIN 7 = 5V

PN807 PIN 1 = 5V

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

(PN807, PIN OPEN:20, CLOSE:19)

YES

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• “ READING ” DISPLAY CHECK

(= ONLY “CD “DISPLAY)

CONNECTOR LOCKING CHECK

(PN808,PN807,PN802,PN801 )

DEFECTIVE CONNECTOR OR

MAIN POWER SUPPLAY

DEFECTIVE IC805

DEFECTIVE MICOM OR

CONNECTOR

DEFECTIVE MICOM OR

CONNECTOR

DEFECTIVE IC801

CHECK VOLTAGE THE PIN 2 OF IC805

IC805 PIN2 : 3.3V

CHECK RESET SIGNAL OF PN807

PN807 PIN12 : 5V

CHECK POWER SUPPLY

PORT( PN808 ,PN807)

PN808 PIN 5 = 6.2V, PIN 7 = 5V

PN807 PIN 1 = 5V

CHECK POWER SUPPLY

PORT( PN808 ,PN807)

PN808 PIN 5 = 6.2V, PIN 7 = 5V

PN807 PIN 1 = 5V

CHECK MICOM INTERFACE

CIRCUIT( PN807 )

PN807 PIN 11,13,14,15 SIGNAL CHECK

(11: STAT, 13: MDATA, 14:MCLK, 15:MLD)

CHECK THE WAVE FORM #1

YES

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• READING OK CHECK (= “NO DISC” DISPLAY)

AAAA

BBBB

CCCC

DDDD

EEEE

CONNECTOR LOCKING

CHECK(PN801,PN802)

DOES SLED MOVE ?

CHECK PN802 PIN 3,4( SL+,SL-)

DEFECTIVE PICKUP OR

IC803 OR IC801 OR IC802

DEFECTIVE PICKUP OR

IC803 OR IC801 OR IC802

DEFECTIVE PICKUP OR

IC803 OR IC801

DEFECTIVE PICKUP OR

IC802

DEFECTIVE PICKUP OR

IC803

DEFECTIVE PICKUP OR

IC803 OR IC801 OR IC802

CHECK PN802 PIN 10( LD )

CHECK PN801 PIN 14,15

(TA- ,TA+)

CHECK PN802 PIN

5,6( SP+,SP-)

CHECK PN801 PIN 13,16

( FA-, FA+)

DOES LENSE MOVE ?

(= UP & DOWN)

DOES LASER LIGHT ?

DOES SPINDLE ROTATE ?

IS READING OK ?

YES

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CHECK PN802 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN802

CONNECTOR

DEFECTIVE PICKUP

SLED MOTOR

• READING OK CHECK #A (= “NO DISC” DISPLAY)

AAAA

DOES SL+ WAVEFORM APPEAR AT

( IC803 PIN14 AND PN802 PIN3)

WAVEFORM #2

SLED MOTOR WAVE

DOES SLIN WAVEFORM

APPEAR AT

( IC803 PIN 5)

WAVEFORM #2

SLED DRIVE WAVE

YES

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CHECK PN801 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN801

CONNECTOR

DEFECTIVE PICKUP

FOCUS ACTUATOR

• READING OK CHECK #B (= “NO DISC” DISPLAY)

BBBB

DOES FA+ WAVEFORM APPEAR AT

( IC803 PIN15 AND PN801 PIN16)

WAVEFORM #3

FOCUS COIL DRIVE WAVE

DOES FAIN- WAVEFORM

APPEAR AT

( IC803 PIN 26)

WAVEFORM #3

FOCUS DRIVE WAVE

YES

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CHECK PN801 CONNECTOR LINE

DEFECTIVE IC805

DEFECTIVE IC802

DEFECTIVE Q801 OR

D811

DEFECTIVE PN801

CONNECTOR

DEFECTIVE PICKUP

LASER PART

• READING OK CHECK #C

(= “NO DISC” DISPLAY)

CCCC

IS ?V APPLIED TO PIN10 OF

PN801

LASER SUPPLY VOLTAGE CHECK

IS 3.3 V APPLIED TO

PIN3 OF IC802

RF IC SUPPLY VOLTAGE

CHECK

IS 2.0 V PIN2 OF IC802

LASER CONTROL VOLTAGE CHECK

YES

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CHECK PN802 CONNECTOR LINE

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN802

CONNECTOR

DEFECTIVE PICKUP

SPINDLE MOTOR

• READING OK CHECK #D

(= “NO DISC” DISPLAY)

DDDD

DOES SP+ WAVEFORM APPEAR AT

( IC803 PIN12 AND PN802

PIN6)WAVEFORM #4

SPINDLE MOTOR DRIVE WAVE

DOES SPIN WAVEFORM

APPEAR AT( IC803 PIN 6)

WAVEFORM #4

SPINDLE DRIVE WAVE

YES

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EEEE

CHECK PN802 CONNECTOR LINE

DOES ARF SIGNAL APPEAR?

(IC802 PORT 8)

WAVEFORM #6

DOES FE, TE SIGNAL APPEAR?

(IC802 PORT FE:23, TE:21)

WAVEFORM #6

DEFECTIVE IC801

DEFECTIVE IC803

DEFECTIVE PN802

CONNECTOR

DEFECTIVE PICKUP OR

IC802

DEFECTIVE PICKUP OR

IC802

DEFECTIVE IC801

• READING OK CHECK # E

(= “NO DISC” DISPLAY)

DOES TA+ WAVEFORM APPEAR AT

( IC803 PIN17 AND PN801 PIN15)

WAVEFORM #5

TRACKING COIL DRIVE WAVE

DOES TAIN- WAVEFORM

APPEAR AT

( IC803 PIN 23)

WAVEFORM #5

TRACKING DRIVE WAVE

YES

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• CD PART VOLTAGE SHEET

IC PIN NO. STOP CD-DA PLAY MP3 PLAY IC801 1 0 0 3.3 MN6627933CG 2 0 0 3.3

3 0 0 3.3 4 0 0 3.3 5 3.3 3.3 3.3 6 0 0 3.3 700 0 8 0 0 3.3 9 0 0 3.3 10 0 0 3.3 11 0 0 3.3 12 0 0 3.3 13 0 0 3.3 14 3.3 3.3 3.3 15 3.3 3.3 3.3 16 3.3 3.3 3.3 17 3.3 3.3 3.3 18 3.3 3.3 3.3 19 0 0 3.3 20 0 0 3.3 21 0 0 3.3 22 0 0 3.3 23 3.3 3.3 3.3 24 0 0 0 25 0 0 3.3 26 0 0 0 27 0 0 0 28 1.5 1.5 1.5 29 1.6 1.5 1.6 30 3.3 0 3.3 31 1.6 1.6 1.6 32 0 0 0 33 0 0 0 34 0 0 0 35 1.6 1.6 1.6 36 0 0 0 37 1.6 1.7 1.7 38 0 0 0 39 3.3 3.3 3.3 40 1.6 1.6 1.6 41 1.6 1.6 1.6 42 1.6 1.6 1.6 43 1.6 1.6 1.6 44 2.3 2.3 2.3 45 1.5 1.5 1.5 46 0 3.3 3.3 47 3 0 0 48 0 0 0 49 0 0 0 50 3.3 3.3 3.3

IC PIN NO. STOP CD-DA PLAY MP3 PLAY

51 0.8 0.8 0.8 52 1.6 1.6 1.6 53 1.6 1.6 1.6 54 3.3 3.3 3.3 55 1 1.4 1 56 1 1.4 1 57 0 0 0 58 1.6 1.6 1.6 59 0 0 0 60 1.6 1.6 1.6 61 3.3 3.3 3.3 62 0 0 0 63 0 0 0 64 0 0 0 65 0 0 0 66 0 0 0 67 1.5 1.5 1.5 68 0 0 0 69 0 0 0 70 0 0 0 71 1.1 1.1 1.1 72 2.8 2.8 2.8 73 0 0 0 74 2.9 2.9 2.9 75 0 0 0 76 0 0 0 77 0 0 0 78 0 0 0 79 1.6 1.6 1.6 80 0 0 3.3 81 2.9 2.9 2.9 82 3.3 3.3 3.3 83 0 0 0 84 1.6 1.5 1.5 85 1.6 1.6 1.6 86 3.3 3.3 3.3 87 1.5 1.5 1.5 88 0 0 3.3 89 0 0 3.3 90 0 0 3.3 91 0 0 3.3 92 0 0 3.3 93 0 0 3.3 94 0 0 3.3 95 0 0 3.3 96 0 0 3.3 97 0 0 3.3 98 3.3 3.3 3.3 99 0 0 3.3 100 0 0 3.3

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