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CONTENTS
SECTION 1. GENERAL
· SERVICING PRECAUTIONS ....................................................................................................... 1-2 · ESD PRECAUTIONS ................................................................................................................... 1-4 · SPECIFICATIONS........................................................................................................................ 1-5 · LOCATION OF CUSTOMER CONTROLS................................................................................... 1-6
SECTION 2. AUDIO PART
· BLOCK DIAGRAM........................................................................................................................ 2-1 · SCHEMATIC DIAGRAMS ............................................................................................................ 2-3 · WIRING DIAGRAM ...................................................................................................................... 2-9 · VOLTAGE SHEET (IC&TR) ........................................................................................................ 2-11 · PRINTED CIRCUIT DIARGAMS ................................................................................................ 2-15
SECTION 3. DVD PART
· ELECTRICAL TROUBLESHOOTING GUIDE ............................................................................. 3-1 · DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ...................................... 3-9 · BLOCK DIAGRAMS .................................................................................................................... 3-22 · DVD PART SCHEMATIC DIAGRAMS ........................................................................................ 3-23 · VOLTAGE SHEET (IC & TR) ...................................................................................................... 3-31 · PRINTED CIRCUIT DIAGRAM ................................................................................................... 3-33
SECTION 4. EXPLODED VIEWS ...................................................................................... 4-1 SECTION 5. SPEAKER PART .......................................................................................... 5-1 SECTION 6. REPLACEMENT PARTS LIST ..................................................................... 6-1
- 1-1 -
SECTION 1. GENERAL PART
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. 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.
NEVER look directly at the laser beam, and don't let contact fingers or other exposed skin.
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.
aPressure Magnet Pressure How to hold the pick-up Cotton swab
Conductive Sheet
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. - 1-2 -
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 (1M) 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.
Armband
Resistor (1 Mohm) Resistor (1 Mohm) Conductive Sheet
- 1-3 -
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.
- 1-4 -
LOCATION OF CUSTOMER CONTROLS
FRONT PANEL
DISPLAY WINDOW
- 1-6 -
REAR PANEL
- 1-7 -
SECTION 3. ELECTRICAL TROUBLESHOOTING GUIDE
1. System check flow
- 3-1 -
2. Power check flow
- 3-2 -
3. Test & debug flow
- 3-3 -
- 3-4 -
- 3-5 -
- 3-6 -
- 3-7 -
- 3-8 -
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL
1) MT1379 main clock is at 27MHz(X501)
2) MT1336 reset is high active
- 3-9 -
3) RS232 waveform during procedure(Downloading)
4) Flash R/W enable signal during download(Downloading)
- 3-10 -
2. SDRAM CLOCK
1) MT1379 main clock is at 27MHz(X501)
3. TRAY OPEN/CLOSE SIGNAL
1) Tray open/close waveform
- 3-11 -
2) Tray close waveform
3) Tray open waveform
- 3-12 -
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)
5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)
- 3-13 -
6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION)
7. DISC TYPE JUDGEMENT WAVEFORM
- 3-14 -
- 3-15 -
8. FOCUS ON WAVEFORM
- 3-16 -
9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)
- 3-17 -
10. TRACKING CONTROL RELATED SIGNAL(System checking)
- 3-18 -
11. RF WAVEFORM
12. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF)
- 3-19 -
13. MT1379 VIDEO OUTPUT WAVEFORM
1) Full colorbar signal(CVBS)
2) Y
- 3-20 -
3) C
14. AUDIO OUTPUT FORM AUDIO DAC
1) Audio related Signal
- 3-21 -
SECTION 5. SPEAKER PART
MODEL: LHS-D6230T
853 862
854 852
861
851 A800
850
- 5-1 -
SECTION 5. SPEAKER PART
MODEL: LHS-D6230W
852
861
854
855
853
851
- 5-2 -
SECTION 2. AUDIO PART
BLOCK DIAGRAM
2-1
2-2
SHEMATIC DIAGRAMS
· MAIN SCHEMATIC DIAGRAM
2-3
2-4
· FRONT SCHEMATIC DIAGRAM
2-5
2-6
· POWER SCHEMATIC DIAGRAM
NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock.
NOTE: 1. Shaded(I) parts are critical for safety.Replace only with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.
2-7
2-8
WIRING DIAGRAM
NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock.
2-9
2-10
VOLTAGE SHEET (IC&TR)
LOC. IC650 PART LC8767XX PIN NUM. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 STOP 0 0 0 4.54 0 0 5 0 4.7 X 4.84 X X 0 2.34 2.45 4.86 4.84 0.57 X 1.65 4.88 4.88 0 2.2 4.37 0 2.77 4.83 -25.2 -25.2 -25.2 -25.2 -25.2 -25.2 -25.2 -25.2 -25.2 0 -25.2 -9.52 -15.3 -9.4 -18.1 -24.2 4.9 -18.1 -15.3 -24.1 -24.1 -27.5 -26.6 DVD PLAY 0 0 0 4.54 0 0 5 0 4.7 X 4.84 X X 0 2.34 2.45 4.86 4.84 0.57 X 1.65 4.88 4.88 0 2.2 4.37 0 2.77 4.83 -25.2 -25.2 -25.2 -25.2 -25.2 -25.2 -25.2 -25.2 -25.2 0 -25.2 -9.52 -15.3 -9.4 -18.1 -24.2 4.9 -18.1 -15.3 -27 -24.1 -27.5 -27 LOC. PART PIN NUM. 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 STOP -15.1 -26.7 -26.7 -26.7 -17.7 -26.7 -26.7 -26.7 X X X X X X X X X X 0 4.9 0 0 0 0 0 0 0 0 0 X X X 3.8 0 X X 0 4.86 X 0 0 0 4.86 0.75 0.75 4.5 4.9 2.5 DVD PLAY -15.2 -27 -27 -27 -18 -27 -27 -27 X X X X X X X X X X 0 4.9 0 0 0 0 0 0 0 0 0 X X X 3.8 0 X X 0 4.85 X 0 0 0 4.86 0.75 0.75 4.5 4.9 2.5 LOC. IC500 PART KIA7808 PIN NUM. 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 4 1 2 3 1 2 3 ANODE CATHODE ANODE CATHODE 1 2 3 4 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 STOP 11.9 0 8 18.4 0 11.9 0 -18.6 -9 18.4 0 9 8.4 3.3 0 8.4 10.3 0 5 5.6 0.6 10.6 -0.2 10.5 -0.2 10.5 -18.6 0 0 18.4 4.5 4.5 4.5 0 4.5 4.5 4.5 9 1.4 1.6 1.6 1.5 2.2 0 5 2.2 0 0 0 0 0 0 DVD PLAY 11.9 0 8 18.4 0 11.9 0 -18.6 -9 18.4 0 9 8.4 3.3 0 8.4 10.3 0 5 5.6 0.6 10.6 -0.2 10.5 -0.2 10.5 -18.6 0 0 18.4 4.5 4.5 4.5 0 4.5 4.5 4.5 9 1.4 1.6 1.6 1.5 2.2 0 5 2.2 0 0 0 0 0 0
IC501
KIA7812
IC502
KIA7909
IC503
KA7809
IC504
KA78R33
IC505
KIA7805
IC507
KIA7805
D507 D511 BD501
D5402 D5402 KBU6G
IC101
KIA4558
IC102
CS5331A
IC103
4052
2-11
2-12
LOC.
PART
IC450
KIA4558
IC601
M60446AFP
IC200
TDA7265
IC250
TDA7265
IC300
TDA7265
PIN NUM. 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 5 30 42 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11
STOP -4.5 0 0 0 0 0 0 0 0 4.5 0 0 0 -9 0 0 0 9 5.2 -5.3 5 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0
DVD PLAY -4.5 0 0 0 0 0 0 0 0 4.5 0 0 0 -9 0 0 0 9 5.2 -5.3 5 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0 -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0
LOC. IC400
PART TDA7265
PIN NUM. 1 2 3 4 5 6 7 8 9 10 11
STOP -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0
DVD PLAY -18.7 0 18.6 0 9.3 -18.6 0 0 0 0 0
2-13
2-14
PRINTED CIRCUIT DIAGRAMS
· MAIN/POWER/JACK P.C BOARD (SOLDER SIDE)
2-15
2-16
· MAIN/POWER/JACK P.C BOARD (COMPONENT SIDE)
2-17
2-18
· FRONT P.C. BOARD (SOLDER SIDE)
· FRONT P.C. BOARD (COMPONENT SIDE)
2-19
2-20
DVD PART SCHEMATIC DIAGRAMS
· MPEG SCHEMATIC DIAGRAM
3-23
3-24
· SERVO SCHEMATIC DIAGRAM
3-25
3-26
· AUDIO SCHEMATIC DIAGRAM
3-27
3-28
· INTERFACE SCHEMATIC DIAGRAM
3-29
3-30
VOLTAGE SHEET (IC&TR)
3-31
3-32
PRINTED CIRCUIT DIAGRAM
· DVD P.C. BOARD(SOLDER SIDE)
3-33
3-34
· DVD P.C. BOARD (COMPONENT SIDE)
3-35
3-36
SECTION 4. EXPLODED VIEWS
· CABINET AND MAIN FRAME SECTION
458 267
NOTE) Refer to "SECTION 6 REPLACEMENT PARTS LIST" in order to look for the part number of each part.
351 A46
FAN
263
454
250 252
A43
264 A26
454
A48 261 454
459 301 262 A41 A47
265
305
302
303
4-1
4-2
· Deck Mechanism Exploded View
4-3
4-4