Daewoo DHC-X250, DHC-X200 Service Manual

DHC-X200/X250

Digital Home Cinema System

1. SAFETY PRECAUTIONS......................................................3/4

2. SPECIFICATIONS....................................................................5

3. LOCATION OF USERS CONTROLS....................................6/8

-. FRONT PANEL.

-. REAR PANEL.

-. DISPLAY.

-. REMOTE CONTROLLER.

4. CONNECTING TO EQUIPMENT.........................................9/11

-. CONNECTING TO TV.

-. CONNECTING TO AUDIO & VIDEO.

-. CONNECTING TO SPEAKER.

-. CONNECTING TO RECORDING EQUIPMENT.

5. TROUBLE SHOOTING GUIDE.........................................12/17

6. DVD PROGRAM DOWNLOAD METHOD.............................18

7. WAVEFORMS OF MAJOR CHECK POINT.....................19/20

-. AUDIO OUT SIGNAL WAVEFORM.

-. DAC OUTPUT SIGNAL WAVEFORM.

-. OPTICAL OUTPUT AUDIO DATA SIGNALFORM.

-. L/R CLOCK DATA WAVEFORM DURING NORMAL PLAY.

-. SERIAL DATA OUTPUT WAVEFORM DURING NORMAL PLAY.

-. Cr OUTPUT DATA WAVEFORM IN COMPONENT OUTPUT.

-. Cb OUTPUT DATA WAVEFORM IN COMPONENT OUTPUT.

-. Y OUTPUT DATA WAVEFORM IN COMPONENT OUTPUT.

8. INTERNAL BLOCK DIAGRAM OF ICs............................21/27

9. IC VOLTAGE CHART.......................................................28/29

10. BLOCK DIAGRAM...............................................................30

11. WIRING DIAGRAM...............................................................31

12. LEVEL DIAGRAM................................................................32

13. SCHEMATIC DIAGRAM.................................................33/39

-. FRONT SCHEMATIC DIAGRAM.

-. DSP SCHEMATIC DIAGRAM.

-. MPEG SCHEMATIC DIAGRAM.

-. MAIN SCHEMATIC DIAGRAM.

-. SCART SCHEMATIC DIAGRAM.

14. PRINTED CIRCUIT DIAGRAM.......................................40/45

-. FRONT PCB.

1) TOP VIEW.

2) BOTTOM VIEW.

-. DSP PCB.

1) TOP VIEW.

2) BOTTOM VIEW.

-. MPEG PCB.

1) TOP VIEW.

2) BOTTOM VIEW.

-. MAIN PCB.

-. SCART PCB.

-. /MIC PCB.

1) TOP VIEW.

2) BOTTOM VIEW.

15. MECHANISM........................................................................46

16. EXPLODED VIEW...........................................................47/51

-. MECHANICAL EXPLODED VIEW

-. MECHANICAL PARTS LIST

-. DISASSEMBLY VIEW

17. ELECTRICAL PARTS LIST............................................52/59

-. CONNECTOR LIST

-. ELECTRICAL PARTS LIST

18. OPTION PARTS LIST..........................................................60

Contents

DIGITAL HOME CINEMA SYSTEM

DHC-X200/X250

1. Safety Precautions

WARNING

: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE

THIS APPLIANCE TO RAIN OR MOISTURE.

CAUTION :

TO REDUCE THE RISK IF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF UNINSULTED "DANGEROUS VOLTAGE"

WITHIN THE PRODUCT'S ENCLOSURE THAT MAY BE

SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK TO PERSONS.

THIS SYMBOL IS INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE APPLIANCE.

CAUTION

TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS POLARIZED AC PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.

LASER SAFETY

THIS UNIT EMPLOYS A LASER. ONLY QUALIFIED SERVICE PERSONNEL SHOULD REMOVE THE COVER OR ATTEMPT TO SERVICE THIS DEVICE DUE TO POSSIBLE EYE INJURY.

CAUTION :

USE OF ANY CONTROLS, ADJUSTMENTS, OR PROCEDURES

OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

CAUTION :

TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF

PLUG TO WIDE SLOT, FULLY INSERT.

ATTENTION :

POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU'AU FOND.

Important Safety Instructions

- All the safety and operating instructions should be read before

the appliance is operated.

- The safety and operating instructions should be retained for

future reference.

- All warnings on the appliance and in the operating instructions

should be adhered to.

- All operating and use instructions should be followed.

1. Water and Moisture - The appliance should not be used near

water - for example, near a bathtub, washbowl, kitchen sink,

laundry tub, in a wet basement, or near a swimming pool, and the like.

2. Carts and Stands - The appliance should be used only with a cart or stand that is recommended by th manufacturer.

3. An appliance and cart combination should be moved with care. Quick stops, excessive force, and uneven

surfaces may cause the appliance and cart combination to overturn.

4. Wall or Ceiling Mounting - The appli-

ance should be mounted to a wall or

ceiling only as recommended by the manufacturer.

5. Ventilation - The appliance should be situated so that its location or position does not interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air

through the ventilation openings.

6. Heat - The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including amplifiers) that produce heat.

7. Power Sources - The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance.

8. Grounding or Polarization - The precautions that should be taken so that the grounding or polarization means of an

appliance is not defeated.

9. Power - Cord Protection - Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.

10.Protective Attachment Plug - If the appliance is equipped with an attachment plug having overload protection. This is a safety feature. See Instruction Manual for replacement or resetting of protective device. If replacement of the plug is required, be sure the service technician has used a replacement plug specified by the manufacturer that has the

same overload protection as the original plug.

11.Cleaning - The appliance should be cleaned only as recommended by the manufacturer.

12.Power Lines - An outdoor antenna should be located away from power lines.

CAUTION

RISK OF ELECTRIC SHOCKS

DO NOT OPEN

PORTABLE CART

Figure 2

1. Safety Precautions

13.Outdoor Antenna Grounding - If an outside antenna is connected to the receiver be sure the antenna system is

grounded so as to provide some protection against voltage surges and built-up static charges. Article 810 of the National Electrical Code, ANSI/NFPA 70, provides information with regard to proper grounding of the mast and supporting

structure, grounding of the lead-in wire to an antenna-dis charge unit, size of grounding conductors,location of antennadischarge unit, connection to grounding electrodes and requirements for the grounding electrode. See Figure 1.

14.Non-use Periods - The power cord of the appliance should be unplugged from the outlet when left unused for a long period

of time.

15.Object and Liquid Entry - Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.

16.Damage Requiring Service - The appliance should be serviced by qualified service personnel when:

a) The power-supply cord or the plug has been damaged; or b) Objects have fallen, or liquid has been spilled into the

appliance; or c) The appliance has been exposed to rain; or

d) The appliance does not appear to operate normally or exhibits a marked change in performance; or e) The appliance has been dropped, or the enclosure

damaged.

17.Servicing - The user should not attempt to service the appliance beyond that described in the operating instructions.

All other servicing should be referred to qualified service personnel.

ANTENNA DISCHARGE UNIT (NEC SECTION 810-20)

ANTENNA LEAD IN WIRE

POWER SERVICE GROUNDING ELECTRODE SYSTEM (NEC ART 250 PART H)

GROUND CLAMP

ELECTRIC SERVICE EQUIPMENT

GROUNDING CONDUCTORS (NEC SECTION 810-21)

GROUND CLAMPS

EXAMPLE OF ANTENNA GROUNDING

NEC - NATIONAL ELECTRICAL CODE

2. Specifications

DHC-X200/X250

3. Location of Users Controls

MIN

MAX

MIN

MAX

1. POWER ON/OFF switch

2. STANDBY indicator

3. STANDBY/ON button

4. SKIP/SEARCH DOWN ( ) button

5. SKIP/SEARCH UP ( ) button

6. DVD/VIDEO CD/MP3 CD/audio CD disc tray

7. Remote control sensor

8. OPEN/CLOSE ( ) button

9. Display

10. TUNE/PRESET button

11. FM MODE button

12. MENU button

13. TONE button

14. SURROUND MODE button

15. MASTER VOLUME control

16. PHONES jack

17. PAUSE ( ) button

18. PLAY ( ) button

19. STOP ( ) button

20. Input selector : VIDEO 1, VIDEO 2, TAPE/MD, TV buttons

21. Input selector : DVD buttons

22. Input selector : TUNER buttons

23. MOVE UP( ) button

24. MOVE LEFT( ) button

25. ENTER button

26. MOVE DOWN( ) button

27. MOVE RIGHT( ) button

28. ECHO LEVEL control(Option)

29. MIC VOL control(Option)

30. MIC jack(Option)

-. Front Panel

1) DHC-X200

2) DHC-X250

1. POWER ON/OFF switch

2. STANDBY indicator

3. STANDBY/ON button

4. SKIP/SEARCH DOWN ( ) button

5. PLAY ( ) button

6. SKIP/SEARCH UP ( ) button

7. PAUSE ( ) button

8. STOP ( ) button

9. DVD/VIDEO CD/MP3 CD/audio CD disc tray

10. OPEN/CLOSE ( ) button

11. Remote control sensor

12. Input selector : VIDEO 1, VIDEO 2, TAPE/MD, TV buttons

13. Input selector : DVD buttons

14. Display

15. Input selector : TUNER buttons

16. MASTER VOLUME control

17. PHONES jack

18. TUNE/PRESET button

19. FM MODE button

20. TONE button

21. SURROUND MODE button

22. ENTER button

23. MOVE UP( ) button

24. MOVE LEFT( ) button

25. MOVE DOWN( ) button

26. MOVE RIGHT( ) button

27. MENU button

28. MIC jack(Option)

29. ECHO LEVEL control(Option)

30. MIC VOL control(Option)

3. Location of Users Controls

DHC-X200/X250

-. Rear Panel

-. Display

1. SURROUND MODE indicator

2. RDS indicator

3. PROGRAM indicator

4. STEREO indicator

5. DYNAMIC RANGE indicator

6. TUNED indicator

7. PBC(Playback Control) indicator

8. MEMORY indicator

9. MP3 indicator

10. PRESET indicator

11. REPEAT indicator

12. RANDOM indicator

13. SLEEP indicator

14. PLAY indicator

15. DVD/VCD/CD indicator

16. PAUSE indicator

17. MULTI FUNCTION indicator

18. SPEAKER CONFIGURATION indicator

1. FM ANTENNA connector

2. AM ANTENNA connectors

3. DIGITAL INPUT OPTICAL jack

4. DIGITAL INPUT COAXIAL jack

5. DIGITAL OUTPUT OPTICAL jack

6. PRE OUT SUBWOOFER jack

7. MONITOR OUT jack

8. S VIDEO MONITOR OUT jack

9. COMPONENT VIDEO OUTPUT Y/Cb/Cr jacks or SCART jack(Optional)

10. Power cord

11. FRONT SPEAKERS connectors

12. CENTER SPEAKER connectors

13. SURROUND SPEAKERS connectors

14. SUBWOOFER connectors

15. TV IN jacks

16. TAPE/MD PLAY(IN)/REC(OUT) jacks

17. VIDEO 2 IN jacks

18. VIDEO 1 PLAY(IN)/REC(OUT) jack

3. Location of Users Controls

DHC-X200/X250

-. Remote Controller

1. STANDBY/ON button

2. DVD FUNCTION button

3. TUNER FUNCTION button

4. SPEAKER SETUP button

5. INPUT SELECTOR: TV/TAPE/VIDEO 1 /VIDEO 2 button

6. SET UP button

7. SEARCH button

8. MENU/PBC RETURN button

9. Number buttons

10. CLEAR button

11. PLAY ( ) button

12. PAUSE ( ) button

13. VOLUME buttons

14. FAST REWIND(FR) ( ) button

15. FAST FORWARD(FF) ( ) button

16. SUBTITLE button

17. GAME button

18. ZOOM button

19. DISPLAY button

20. D-RANGE(Dynamic Range) button

21. FM MODE button

22. DIMMER button

23. TEST TONE button

24. REPEAT/PTY button

25. RANDOM/RDS button

26. TUNER PRESET buttons

27. CH LEVEL button

28. MOVE /ENTER buttons

29. DELAY TIME button

30. TONE button

31. MEMORY button

32. TITLE button

33. PLAY MODE button

34. STOP( ) button

35. OPEN/CLOSE button

36. SKIP/SEARCH DOWN ( ) button

37. SKIP/SEARCH UP ( ) button

38. AUDIO button

39. SLOW button

40. ANGLE button

41. A-B REPEAT button

42. PAL/NTSC button

43. SURROUND MODE button

44. SLEEP button

45. MUTING button

46. PBC/RT button

47. MPX button

/ / /

4. Connecting to Equipment

DHC-X200/X250

-. Connecting to TV

If the TV or monitor is equipped with an S video

input, make the S video connection in addition to the normal video connection. The S video connection will provide higher quality picture playback.

21-Pin SCART Cable(not included) to 21-pin SCART input terminal on TV

Component, SCART terminal is optional.(Exclusive) SCART Specification :

Composite Video output(DVD, Video 1, Video 2) Audio L/R Output(DVD only)

for America version: optional

SCART Jack : For Europe

optional

or American version:

Optional

4. Connecting to Equipment

-. Connecting to AUDIO & VIDEO

DHC-X200/X250

This connection is only for equipment with a digital optical audio input. Digital recording is not always possible; therefore, also connect to the analog TAPE/MD OUT(REC) jacks.

Remove the protective caps before making connections. When not in use, be sure to replace them.

The OPTICAL INPUT connector is for equipment with a digital audio output such as a satellite tuner which is to be connected to analog VIDEO 1 connectors instead of a VCR. To connect to the OPTICAL INPUT connector, use an optical fiber connection cable. If the equipment doesn't have recording functions, you may leave the analog DIGITAL OUT OPTICAL connectors disconnected.

SCART Jack : For Europe

optional

4. Connecting to Equipment

-. Connecting to Speaker

-. Connecting to Recording Equipment

DHC-X200/X250

Surround speakers

Right ch. Left ch.

Press and hold the lever.

Insert the stripped end of the cord.

Release the lever to replace it.

+ +

Front speakers

Right ch.

Left ch.

RED

BLACK BLACK

BLACK

Center speaker

BLACKBLUE

Subwoofer speaker

BROWN

BLACK

WHITE WHITE

Active subwoofer

[USER Optional]

Audio Input

To prevent damage to circuits, never short-

circuit the positive (+) and negative (-) speaker wires.

Do not connect the speaker cable to the L

and R connectors at the same time and do not connect more than one speaker to the same speaker connectors.

5. Trouble Shooting Guide

DHC-X200/X250

1. Basic Operating

Is STANDBY LED on?

Push power on.

Is POWER on?

Does initial read work

Turn Power on.

Does it play?

Does it output audio?

Yes

Check AUDIO circuit.

Check tracking SERVO

circuit.

Check LASER circuit.

Check focus circuit.

Check disc.

Check protect circuit.

Check power supply circuit.

Check POWER SUPPLY

circuit.

Check connection CN906.

2. Front Micom Circuit

Replace IC904

Yes

Check if IC904 Pin38

is HIGH ?

Check IC904 reset waveform

Check if IC904 Pin44

is High(+5.0V) ?

Check +5.0V line.

Check if IC904 Pin4

is Low(0 V) ?

Check Power down line.

Check if IC904 Pin18

is High ?

Yes

Check Protection circuit.

Does DVD appear

at VFD ?

Push power on.

Does loading appear

at VFD ?

Yes

Does no DISC or

time appear at VFD ?

Yes

Check if DVD an Audio Micom

Interface is OK.

Yes

Does Video1/2,

MD/TAPE, TV, FM 87.5kHz

appear at VFD ?

Yes

Check from Micom

to DVD Interface

Check Power

Check Loader.

Check MPEG PCB

Yes

Check Power Supply circuit

Does it not appear

DVD Display at VFD ?

Yes

Does it apear PCM

96kHz Stereo at VFD ?

Yes

Check connector

CN901 if is normally

Yes

Check power supply

circuit of Main PCB

Yes

Refer to Power Supply Circuit.

Check Oscillator of X901

Yes

Replace X901

Check if IC401 Pin65

is work ?

Yes

Check DVD Reset control

Check if Connector

CN901 Pin4 is work ?

Yes

Check Connector

(CP901,CP903) if is

normally.

Yes

Reconnect it.

-. Audio Part

+ 27 hidden pages