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1-1

[CONTENTS]

SECTION 1. GENERAL

• SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

SECTION 2. AUDIO PART

• AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

SECTION 3. DVD & AMP PART

• ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

• DVD PART SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22

SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

SECTION 6. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

Содержание LH-T255SD

Страница 1: ...DVD CD RECEIVER SERVICE MANUAL MODEL LH T255SD LHS 25SDS LHS 25SDW MODEL LH T255SD LHS 25SDS LHS 25SDW SERVICE MANUAL ...

Страница 2: ...PART AUDIO TROUBLESHOOTING GUIDE 2 1 BLOCK DIAGRAM 2 4 SCHEMATIC DIAGRAMS 2 6 WIRING DIAGRAM 2 20 PRINTED CIRCUIT DIARGAMS 2 22 SECTION 3 DVD AMP PART ELECTRICAL TROUBLESHOOTING GUIDE 3 1 DVD PART SCHEMATIC DIAGRAMS 3 22 SECTION 4 EXPLODED VIEWS 4 1 SECTION 5 SPEAKER PART 5 1 SECTION 6 REPLACEMENT PARTS LIST 6 1 ...

Страница 3: ...ser 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 the...

Страница 4: ... 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 ...

Страница 5: ...arges 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...

Страница 6: ... Tuning Range 87 5 108 0 MHz or 65 0 74 0 MHz 87 5 108 0 MHz Intermediate Frequency 10 7 MHz Signal to Noise Ratio 60 dB Mono Frequency Response 140 10 000 Hz AM MW Tuning Range 522 1 620 kHz or 520 1 720 kHz Intermediate Frequency 450 kHz AMPLIFIER Stereo mode 30W 30W 6Ω at 1 kHz THD 10 Surround mode Front 30W 30W THD 10 Center 30W Surround 30W 30W 6Ω at 1 kHz THD 10 Subwoofer 70W 8Ω at 30 Hz THD...

Страница 7: ......

Страница 8: ...2 1 SECTION 2 AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1 POWER SUPPLY CIRCUIT ...

Страница 9: ...2 2 2 FRONT CIRCUIT 1 2 PIN3 PIN4 PIN9 27 5 FL 32 4 VKK 23 7 FL 5 0 CN902 CN902 ...

Страница 10: ...2 3 3 FRONT CIRCUIT 2 2 ...

Страница 11: ......

Страница 12: ...2 4 2 5 BLOCK DIAGRAM NOTES Warning NOTES Parts that are shaded are critical NOTES With respect to risk of fire or NOTES electricial shock ...

Страница 13: ...2 7 SCHEMATIC DIAGRAMS 1 POWER SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T NOTES Warning NOTES Parts that are shaded are critical NOTES With respect to risk of fire or NOTES electricial shock ...

Страница 14: ...2 8 2 9 2 POWER SUB SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Страница 15: ...2 10 2 11 3 MICOM SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Страница 16: ...2 12 2 13 4 FRONT SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Страница 17: ...2 14 2 15 5 DSP AMP SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Страница 18: ...2 16 2 17 6 I O SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Страница 19: ...2 18 2 19 7 MAIN MIC SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...

Страница 20: ...2 20 2 21 NOTES Warning NOTES Parts that are shaded are critical NOTES With respect to risk of fire or NOTES electricial shock WIRING DIAGRAM ...

Страница 21: ...2 22 2 23 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN DVD P C BOARD DIAGRAM TOP ...

Страница 22: ...2 24 2 25 2 MAIN DVD P C BOARD DIAGRAM BOTTOM ...

Страница 23: ...2 26 2 27 3 FRONT P C BOARD ...

Страница 24: ...2 28 2 29 4 SMPS P C BOARD LOCATION GUIDE NOTES Warning NOTES Parts that are shaded are critical NOTES With respect to risk of fire or NOTES electricial shock 5 JACK P C BOARD ...

Страница 25: ......

Страница 26: ...ion Recieve OPEN CLOSE Key Receive CLOSE Key 1 Stop Playback Open Tray 2 Display tray open message LOGO 1 Execute Pressed Key IR Key 2 Systemoperati on Routi ne Loop 1 Judge whether have disc and disc type 2 Jump to related disc reading procedure SLED at Inner Side 1 8082 initializes SERVO DSP RISC registers 2 Write RISC code to SDRAM 3 Reset RISC SECTION 3 DVD AMP PART ...

Страница 27: ...stem clock 2 Check systemreset circuit 3 Check FLASH R Wenable signal PRD RWR 4 Check FLASH Memory related circuit Check the AC Vol tage Power PCBA 110V or 220V Switch on the Power PCBA Is the DC Voltage outputs OK 34V 9V 36V 5 6V 5V 8V 9V 2 5V 3 3V Are 3 3V and 5V DC outputs normal on main PCBA Update FLASH IC500 successfully Replace FLASH IC500 A ...

Страница 28: ...3 3 A 115 ...

Страница 29: ...3 4 B 1 2 ...

Страница 30: ...3 5 C ES6698 ES6698 ES6698 ...

Страница 31: ...3 6 D ...

Страница 32: ...k connection between IC300 ABCK ALRCK ASDAT Check the related circuit of PWM Check Audio out Pins52 54 55 59 62 68 Normal PWM IC out IC300 PWM IC received correct data stream Check Digital Amp circuit IC301 IC302 ...

Страница 33: ... it appear DVD Error at FLD Refer to SMPS Refer to oscillator Circuit Check IC101 Reset Waveform Check 3 3V line Check Power section Circuit NO Check power part of Main B D Check oscillator of X101 Check if IC101 Pin80 is high Check if IC101 Pin32 51 80 are high 5V Check if IC101 Pin96 is high Replace IC101 NO NO Check if DVD an Audio Micom Insert is OK Check Power YES Check DVD Module YES Check S...

Страница 34: ... DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 ES6698FD main clock is at 27MHz X501 3 8V 27MHz FIG 1 1 2 ES6698FD reset is high active PWR_CTL SYSTEM µ COM IC501 PIN83 5 2VA Power Cord in M_RESET IC501 PIN 207 URST IC501 PIN 188 FIG 1 2 ...

Страница 35: ... 10 2 SDRAM CLOCK 1 ES6698FD main clock is at 27MHz X501 IC503 PIN 38 DCLK 93MHz Vp p 2 2 Vmax 2 7V FIG 2 1 4 Flash R W enable signal during download Downloading FRD IC500 PIN 28 FWR IC500 PIN 11 FIG 1 4 ...

Страница 36: ...LOSE SIGNAL 1 Tray open close waveform OPEN PDM03 PIN7 CLOSE PDM03 PIN8 TROPEN IC402 PIN 4 TRCLOSE IC402 PIN 5 FIG 3 1 2 Tray close waveform OPEN PDM03 PIN7 CLOSE PDM03 PIN8 TROPEN IC402 PIN 4 TRCLOSE IC402 PIN 5 FIG 3 2 ...

Страница 37: ...DISC CONDITION FMSO 2 0V 1 4V 1 0V IC501 PIN 19 STBY 5V IC401 PIN 50 SL 4 7V 3 6V 1 9V IC404 PIN 12 SL 5 3V 3 7V 2 5V IC404 PIN 11 FIG 4 1 3 Tray open waveform OPEN PDM03 PIN7 CLOSE PDM03 PIN8 TROPEN IC402 PIN 4 TRCLOSE IC402 PIN 5 FIG 3 3 ...

Страница 38: ...ION FOSO 1 5V 1 4V 1 3V IC501 PIN 12 F 4 0V 3 6V 3 2V IC404 PIN 14 F 4 0V 3 6V 3 2V IC404 PIN 13 FIG 5 1 6 LASER POWER CONTROL RELATED SIGNAL NO DISC CONDITION MDI1 0V 180mV IC401 PIN 26 LD01 5 0V 3 5V IC401 PIN 20 LD02 5 0V 3 6V IC401 PIN 21 FIG 6 1 ...

Страница 39: ...3 14 F IC404 PIN 14 FE IC401 PIN 40 RFL IC401 PIN 19 FIG 7 2 DVD 7 DISC TYPE JUDGEMENT WAVEFORMS F IC404 PIN 14 FE IC401 PIN 40 RFL IC401 PIN 19 FIG 7 1 DVD ...

Страница 40: ...3 15 F IC404 PIN 14 FE IC401 PIN 40 RFL IC401 PIN 19 FIG 7 3 CD F IC404 PIN 14 FE IC401 PIN 40 RFL IC401 PIN 19 FIG 7 4 CD ...

Страница 41: ...3 16 FE IC401 PIN 40 FOSO IC501 PIN12 F IC404 PIN 14 F IC404 PIN 13 FIG 8 2 CD 8 FOCUS ON WAVEFORMS FE IC401 PIN 40 FOSO IC501 PIN12 F IC404 PIN 14 F IC404 PIN 13 FIG 8 1 DVD ...

Страница 42: ... NO DISC CONDITION DMSO 1 4V 1 8V IC501 PIN 18 SP 3 6V 2 4V IC404 PIN 18 SP 3 6V 4 8V IC404 PIN 17 FIG 9 1 10 TRACKING CONTROL RELATED SIGNAL System checking TE IC401 PIN 39 TRSO IC501 PIN 13 T IC404 PIN 16 T IC404 PIN 15 FIG 10 1 DVD ...

Страница 43: ...3 18 11 RF WAVEFORM RFOP 2 3V 1 1V IC401 PIN 55 RFON 0 8V 2 0V IC401 PIN 57 FIG 11 1 TE IC401 PIN 39 TRSO IC501 PIN 13 T IC404 PIN 16 T IC404 PIN 15 FIG 10 2 CD ...

Страница 44: ...3 19 12 ES6698FD VIDEO OUTPUT WAVEFORMS 1 Full colorbar signal COMPOSIT IC501 PIN 110 FIG 12 1 2 Y IC501 PIN 113 FIG 12 2 ...

Страница 45: ...3 20 1 Audio L R FIG 13 1 13 AUDIO OUTPUT FROM PWM IC IC300 PIN 68 49 2 Audio related Signal ASDAT0 IC501 PIN 117 ABCK IC501 PIN 123 ALRCK IC501 PIN 116 ASDATA3 FIG 13 2 ...

Страница 46: ...3 21 1 R315 FRONT L 2 R310 FRONT R 3 R316 REAR 4 R324 REAR 5 R303 CENTER 6 R317 WOOFER 14 DVD AMP WAVEFORMS ...

Страница 47: ......

Страница 48: ...A B C D E F G H I J K L M N O P Q R S T 3 22 3 23 DVD PART SCHEMATIC DIAGRAMS 1 DVD MPEG DSP SCHEMATIC DIAGRAM ...

Страница 49: ...A B C D E F G H I J K L M N O P Q R S T 3 24 3 25 2 RF SERVO SCHEMATIC DIAGRAM ...

Страница 50: ...3 FRONT MIC SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T 3 26 3 27 ...

Страница 51: ......

Страница 52: ...3 463 351 463 463 463 A26 283 452 A41 274 274 452 A50 261 261 261 OPTIONAL PART NOTES THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE 4 1 4 2 SECTION 4 EXPLODED VIEWS ...

Страница 53: ...EMBLY DECK MECHA LOADING DP 9 SH 015A 4680R E008A MOTOR MECH FEEDING RF 300EA 1D390 MABUCHI NSP 015B 4560R 0008A PULLEY MOTOR 016 6871R 9294A PWB PCB ASSEMBLY TOTAL DP 9C LOADING 017 4470R 0176A GEAR DVD DP 9 LOADING MOLD 018 4974R 0067A GUIDE DVD DP 9C UP DOWN MOLD 019 3210R M008A FRAME DP 9C UP DOWN MOLD 020 3040R M066A BASE MAIN DP 9T MOLD NSP 021 4681R B009B MOTOR ASSEMBLY DECK MECHA DP9 FEEDI...

Страница 54: ...5 1 SECTION 5 SPEAKER SECTION MODEL LHS 25SDS 852 853 851 850 854 A800 ...

Страница 55: ...5 2 MODEL LHS 25SDW A900 953 954 955 956 958 957 950 ...

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