Daewoo DHC-X250, DHC-X200 Service Manual

0 (0)

Digital Home Cinema System

DHC-X200/X250

DIGITAL HOME CINEMA SYSTEM

DHC-X200/X250

Contents

1. SAFETY PRECAUTIONS......................................................	3/4	12. LEVEL DIAGRAM................................................................	32
2. SPECIFICATIONS....................................................................	5	13. SCHEMATIC DIAGRAM.................................................	33/39
		-. FRONT SCHEMATIC DIAGRAM.
3. LOCATION OF USERS CONTROLS....................................	6/8	-. DSP SCHEMATIC DIAGRAM.
-. FRONT PANEL.		-. MPEG SCHEMATIC DIAGRAM.
-. REAR PANEL.		-. MAIN SCHEMATIC DIAGRAM.
-. DISPLAY.		-. SCART SCHEMATIC DIAGRAM.

-. 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

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

PORTABLE CART

Figure 2

1. Safety Precautions

WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

CAUTION

RISK OF ELECTRIC SHOCKS

DO NOT OPEN

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 appliance 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.

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.

EXAMPLE OF ANTENNA
GROUNDING		ANTENNA LEAD
GROUNDING		ANTENNA LEAD
GROUND CLAMP		IN WIRE
		IN WIRE



		ANTENNA DISCHARGE UNIT
		(NEC SECTION 810-20)
ELECTRIC		GROUNDING CONDUCTORS
		GROUNDING CONDUCTORS
		(NEC SECTION 810-21)
SERVICE		(NEC SECTION 810-21)
SERVICE
EQUIPMENT		GROUND CLAMPS
		GROUND CLAMPS
	POWER SERVICE GROUNDING
	POWER SERVICE GROUNDING
	ELECTRODE SYSTEM

NEC - NATIONAL ELECTRICAL CODE (NEC ART 250 PART H)

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.

Daewoo DHC-X250, DHC-X200 Service Manual

2. Specifications

DHC-X200/X250

3. Location of Users Controls

-. Front Panel

1) DHC-X200

MIN

MAX

MIN

MAX

1. POWER ON/OFF switch

16. PHONES jack

STANDBY indicator

17.

PAUSE (

) button

STANDBY/ON button

18.

PLAY (

) button

SKIP/SEARCH DOWN (

) button

19.

STOP (

) button

SKIP/SEARCH UP (

) button

20.

Input selector :

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

VIDEO 1, VIDEO 2, TAPE/MD, TV buttons

Remote control sensor

21.

Input selector : DVD buttons

OPEN/CLOSE ( ) button

22.

Input selector : TUNER buttons

Display

23.

MOVE UP(

) button

10.

TUNE/PRESET button

24.

MOVE LEFT(

) button

11. FM MODE button

25. ENTER button

12. MENU button

26. MOVE DOWN(

) button

13.

TONE button

27.

MOVE RIGHT(

) button

14. SURROUND MODE button

28. ECHO LEVEL control(Option)

15.

MASTER VOLUME control

29.

MIC VOL control(Option)

2) DHC-X250

30.

MIC jack(Option)

1. POWER ON/OFF switch

16. MASTER VOLUME control

STANDBY indicator

17.

PHONES jack

3. STANDBY/ON button

18. TUNE/PRESET button

4. SKIP/SEARCH DOWN (

) button

19. FM MODE button

PLAY (

) button

20.

TONE button

6. SKIP/SEARCH UP (

) button

21. SURROUND MODE button

PAUSE (

) button

22.

ENTER button

STOP (

) button

23.

MOVE UP(

) button

DVD/VIDEO

CD/MP3 CD/audio CD disc tray

24.

MOVE LEFT(

) button

10. OPEN/CLOSE (

) button

25. MOVE DOWN(

) button

11.

Remote control sensor

26.

MOVE RIGHT(

) button

12.

Input selector :

27.

MENU button

VIDEO 1, VIDEO 2, TAPE/MD, TV buttons

28.

MIC jack(Option)

13.

Input selector : DVD buttons

29.

ECHO LEVEL control(Option)

14.

Display

30.

MIC VOL control(Option)

15.

Input selector : TUNER buttons

3. Location of Users Controls

DHC-X200/X250

-. Rear Panel

1. FM ANTENNA connector

10. Power cord

2. AM ANTENNA connectors

11. FRONT SPEAKERS connectors

3. DIGITAL INPUT OPTICAL jack

12. CENTER SPEAKER connectors

4. DIGITAL INPUT COAXIAL jack

13. SURROUND SPEAKERS connectors

5. DIGITAL OUTPUT OPTICAL jack

14. SUBWOOFER connectors

6. PRE OUT SUBWOOFER jack

15. TV IN jacks

7. MONITOR OUT jack

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

8. S VIDEO MONITOR OUT jack

17. VIDEO 2 IN jacks

9. COMPONENT VIDEO OUTPUT Y/Cb/Cr jacks

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

or SCART jack(Optional)

-. Display













1.	SURROUND MODE indicator	10.	PRESET indicator
2.	RDS indicator	11.	REPEAT indicator
3.	PROGRAM indicator	12.	RANDOM indicator
4.	STEREO indicator	13.	SLEEP indicator
5.	DYNAMIC RANGE indicator	14.	PLAY indicator
6.	TUNED indicator	15.	DVD/VCD/CD indicator
7.	PBC(Playback Control) indicator	16.	PAUSE indicator
8.	MEMORY indicator	17.	MULTI FUNCTION indicator
9.	MP3 indicator	18.	SPEAKER CONFIGURATION indicator

3. Location of Users Controls

-. Remote Controller

DHC-X200/X250

STANDBY/ON button

16.

SUBTITLE button

32.

TITLE button

2. DVD FUNCTION button

17. GAME button

33. PLAY MODE button

TUNER FUNCTION button

18.

ZOOM button

34.

STOP(

) button

4. SPEAKER SETUP button

19. DISPLAY button

35. OPEN/CLOSE button

INPUT SELECTOR: TV/TAPE/VIDEO 1

20.

D-RANGE(Dynamic Range) button

36.

SKIP/SEARCH DOWN (

) button

/VIDEO 2 button

21.

FM MODE button

37.

SKIP/SEARCH UP (

) button

SET UP button

22.

DIMMER button

38.

AUDIO button

SEARCH button

23.

TEST TONE button

39.

SLOW button

8. MENU/PBC RETURN button

24. REPEAT/PTY button

40. ANGLE button

Number buttons

25.

RANDOM/RDS button

41.

A-B REPEAT button

10.

CLEAR button

26.

TUNER PRESET buttons

42.

PAL/NTSC button

11. PLAY (

) button

27. CH LEVEL button

43. SURROUND MODE button

12.

PAUSE (

) button

28.

MOVE / / / /ENTER buttons

44.

SLEEP button

13.

VOLUME

/ buttons

29.

DELAY TIME button

45.

MUTING button

14.

FAST REWIND(FR) (

) button

30.

TONE button

46.

PBC/RT button

15. FAST FORWARD(FF) (

) button

31. MEMORY button

47. MPX button

4. Connecting to Equipment

-. Connecting to TV

DHC-X200/X250

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)

SCART Jack

: For Europe

for America version:

optional

For American version: Optional

4. Connecting to Equipment

-. Connecting to AUDIO & VIDEO

DHC-X200/X250

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.

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

SCART Jack

: For Europe

optional

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.

4. Connecting to Equipment

-. Connecting to Speaker

DHC-X200/X250

Front speakers			Center speaker			To prevent damage to circuits, never short-
Front speakers			Center speaker	Active subwoofer		circuit the positive (+) and negative
				Active subwoofer
				[USER Optional]
Right ch.				[USER Optional]		(-) speaker wires.
	Left ch.
	Left ch.
						Do not connect the speaker cable to the L
					Audio Input	and R connectors at the same time and do
						not connect more than one speaker to the
+	+	+				not connect more than one speaker to the
+	+	+				same speaker connectors.
						same speaker connectors.

	RED
BLACK	BLUE	BLACK
BLACK	BLACK
			BLACK	BROWN
	WHITE	BLACK	WHITE
					Press and hold	Insert the stripped	Release the lever to
	+			+	the lever.	end of the cord.	replace it.
					the lever.	end of the cord.	replace it.

Right ch.

Surround speakers

Subwoofer speaker

-. Connecting to Recording Equipment

5. Trouble Shooting Guide

-. Audio Part

DHC-X200/X250

1. Basic Operating

Push power on.

Is STANDBY LED on?

Yes

Turn Power on.

Yes

Is POWER on?

Yes

Does initial read work

Yes

Does it play?

Yes

Check POWER SUPPLY circuit.

Check connection CN906.

Check power supply circuit.

Check LASER circuit. Check focus circuit.

Check disc. Check protect circuit.

Check tracking SERVO circuit.

Does it output audio?			No
Does it output audio?			No



	Yes

	OK	Check AUDIO circuit.

2. Front Micom Circuit

Push power on.

Does DVD appear

at VFD ?

Does Video1/2,

Yes

MD/TAPE, TV, FM 87.5kHz

appear at VFD ?

Does loading appear

at VFD ?

Yes

Does no DISC or

time appear at VFD ?

Yes

Check if DVD an Audio Micom

Interface is OK.

Does it not appear

DVD Display at VFD ?

Does it apear PCM 96kHz Stereo at VFD ?

Yes

Check Connector No (CP901,CP903) if is

normally.

Reconnect it.

Check connector

CN901 if is normally

Reconnect it.

Yes

Check power supply

circuit of Main PCB

Refer to Power Supply Circuit.

Yes

Check Oscillator of X901		No
Check Oscillator of X901		No

Replace X901

Yes

Check if IC401 Pin65

is work ?

Check DVD Reset control

Yes

Check if Connector

CN901 Pin4 is work ?

			Check from Micom
Yes			Check from Micom
Yes			to DVD Interface

Check Power

Yes

Check Loader.

Check MPEG PCB

Yes

Check if IC904 Pin38 is HIGH ?

Check if IC904 Pin44 is High(+5.0V) ?

Check if IC904 Pin4 is Low(0 V) ?

Check if IC904 Pin18 is High ?

Yes

Replace IC904

Check Power Supply circuit

Check IC904 reset waveform

Check +5.0V line.

Check Power down line.

Check Protection circuit.

+ 27 hidden pages