DAEWOO HC-7230UX Service Manual

Digital Home Cinema System

SN: 9CD8305700

Mar. 2008

Model : HC-7230UX Series

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HC-7230UX

Table of Contents

DIGITAL HOME CINEMA SYSTEM

Model : HC-7230UX Series

SAFETY PRECAUTIONS

.............................................

1

SPECIFICATIONS

..........................................................

2

LOCATION OF USERS CONTROLS

.............................

3

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Front Panel

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Display

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Rear Panel

●

Remote Controller

CONNECTING TO EQUIPMENT

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4

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Connecting to TV

●

Connecting to Speaker

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Connecting to Audio & Video

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Connecting the supplied FM antennas (option)

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Connecting the USB device of Fresh memory type (option)

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Connecting the Microphone for KARAOKE

FIRMWARE UPGRADE

..................................................

5

INTERNAL BLOCK DIAGRAM OF ICs

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EXPLODED VIEW AND MECHANICAL PARTS LIST

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Mechanical Exploded View / Parts list

WIRING DIAGRAM

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SCHEMATIC DIAGRAM

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9

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FRONT Section

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POWER + AMP Section 1 : SMPS

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POWER + AMP Section 2 : VR

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POWER + AMP Section 3 : MP 7782

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POWER + AMP Section 4 : MP 7722

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MPEG Section 1 - MPEG Processor

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MPEG Section 2 - Power

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MPEG Section 3 - ROM/FLASH/Memory

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MPEG Section 4 - Motor Driver

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MPEG Section 5 - Video Buffer

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MPEG Section 6 - Audio Filter

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MPEG Section 7 - Tuner

(option)

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MPEG Section 8 - AV Switch

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MPEG Section 9 - External ADC

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MPEG Section 10 - Audio Input

P.C.B PATTERN LAYOUT

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10

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FRONT

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MPEG

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POWER + AMP

Appendix ELECTRICAL PARTS LIST.

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11

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Electrical Parts List

Safety Precautions

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WARNING

: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE

THIS APPLIANCE TO RAIN OR MOISTURE.

CAUTION :

TO REDUCE THE RISK OF 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

Safety Precautions

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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

Specifications

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Power Output at 10% THD(RMS)

THD(Total Harmonic Distortion)

Frequency Response(Analogue)

S/N Ratio, IHF-A Weighted

Subwoofer Turnover Frequency

Channel Separation

At 1 KHz, 8 ohms

At 1 KHz, 1 W

1 W

CD PLAY

1 KHz

30 W

0.5 %

100 Hz ~ 20 KHz

>55 dB

120 Hz

50 dB

General specifications

Front Amp. Section

Front Amp.

Power Output at 10% THD(RMS)

THD(Total Harmonic Distortion)

S/N Ratio, IHF-A Filter

Frequency Response

At 1 KHz, 8 ohms

At 1 KHz, 1 W

Rated Output

1 W

30 W

0.5 %

>55 dB

135 Hz ~ 18 KHz

Center Amp.

Power Output at 10% THD(RMS)

THD(Total Harmonic Distortion)

S/N Ratio, DOLBY Frequency Response

At 1 KHz, 8 ohms

At 1 KHz, 1 W

Rated Output

1 W

30 W

0.5 %

>55 dB

135 Hz ~ 18 KHz

Rear Amp.

Power Output at 10% THD(RMS)

Frequency Response

S/N Ratio, IHF-A Weighted

At 100 Hz, 6 ohms

1 W

50 W

20 Hz ~ 150 Hz

>50 dB

Woofer

Composite 75 ohm

S-Video(Y/C) 75 ohm(DVD only)

Component Out(Y/ Cb/ Cr) :Option

Ref 500KHz

@1MHz

DVD

1.0Vp-p/75 ohm

1Vp-p/ 0.286Vp-p

1Vp-p/0.7Vp-p/0.7Vp-p

45dB 60dB

0.5 dB

5Hz~5.7MHz

40dB

Video Section

Output Level/Impedance

Frequency Response

Crosstalk

S/N Ratio

Tuning Range

Scanning Frequency Interval

Usable Sensitivity, 75 ohms

S/N Ratio @1mV IHF-A FILTER

USA Version

Australia / Europe Version

USA Version

Australia / Europe Version

S/N=30dB, USA Version

S/N=26dB, Australia / Europe Version

Mono USA Version

Mono Australia / Europe Version

Stereo USA Version

Stereo Australia / Europe Version

87.5~108.0MHz

87.5~108.0MHz 100KHz

50KHz 2uV(17.2dBf) 3uV(20.8dBf)

55dB 55dB 50dB 50dB

FM Tuner Section (option)

(FM ANT Impedance : 75 ohms)

Power output at 10%THD(RMS)

Power supply

Operating Voltage ~ 100 V - 240 V, 50/60Hz

(Free Voltage)

Power consumption Operating 60 Watt

Dimensions (W x D x H) / Weight 430 x 316 x 52 mm / 3.24 kg

Model

HC-7230UX

Front / Center / Rear

30 W, 8 ohm

Woofer

50 W, 6 ohm

Location of Users Controls

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Front Panel

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HC-7230UX

1. DVD indicator

2. CD/VCD/S VCD indicator

3. AM(MW) indicator (option)

4. FM indicator (option)

5. STEREO indicator

6. PLAY/PAUSE indicator

7. MEMORY indicator

8. DOLBY DIGITAL indicator

9. MP3 indicator

10. RDS indicator(option)

11. Multi-Function Information Displaying Area

1. *LINE OUTPUT Jacks

2. Region Code

3. AUX INPUT jacks

4. COAXIAL OUTPUT Jack

5. COMPONENT VIDEO OUTPUT (Y, Cb/Pb,Cr/Pr) jacks

6. VIDEO OUT jack

7. S VIDEO OUT jack

8. FM ANTENNA connector (option)

9. AM(MW) ANTENNA connectors (option)

10. *SCART jack (option)

11. SPEAKER connectors

12. Power cord

1. POWER ON/OFF push button

2. MIC 1 / MIC 2 jacks

3. MIC 1 / MIC 2 VOLUME Controls

4. DISC Tray

5. Remote Control Sensor

6. USB Port

7. Display

8. MASTER VOLUME Control

9. OPEN/CLOSE ( ) button

10. FUNCTION button

11. PLAY/PAUSE ( ) button

12. STOP ( )/BAND button

13. PREV ( ) button

14. NEXT ( ) button

* Choose stereo in DOWNMIX in speaker setup when using LINE OUTPUT or SCART Jack (option)

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Rear Panel

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Display

Location of Users Controls

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1. POWER ON/STANDBY button

2. MUTE button

3. OPEN/CLOSE button

4. PBC button

5. RETURN button

6. STEP button

7. SLOW button

8. DISPLAY button

9. PROGRESSIVE/INTERLACE Scan button

10. TV SYSTEM(PAL/NTSC: DVD only) button

11. R/L button

12. Number(1~10, 10+) buttons

13. PROGRAM button

14. ANGLE button

15. LANGUAGE button

16. DOLBY PRO LOGIC II MODE button

17. REPEAT button

18. RDS/SUBTITLE button

19. FUNCTION button

20. AUTO MEMORY/SEARCH button

21. FM MODE/A-B REPEAT button

22. SETUP button

23. MENU button

24. Enter button

25. Direction( ) button

26. Direction( ) button

27. Direction( )/TUNING - button

28. Direction( )/TUNING + button

29. ZOOM button

30. TITLE button

31. SKIP PREV ( ) button

32. SKIP NEXT ( ) button

33. FAST REVERSE ( ) button

34. FAST FORWARD ( ) button

35. PLAY/PAUSE ( ) button

36. STOP ( )/BAND button

37. VOLUME - buttons

38. VOLUME + buttons

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+10

MUTE

REPEAT

PBC RETURN STEP SLOW

PREV NEXT REV FWD

ZOOM TITLE

SETUP MENU

ENTER

PLAY/PAUSE STOP/BAND

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VOLUME

DISPLAY

PROG

ANGLE

LANGUAGE

DPLIIMODE

FUNCTION

RDS

SUBTITLE

AUTO/MEMORY

SEARCH

FM MODE

A-B

P/I SCAN P/N R/L

TUNING+TUNING-

POWER

OPEN/CLOSE

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Remote Controller

Connecting to Equipment

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Connecting to TV

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

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SCART Specification : Composite and Component Video output(DVD, Video)Audio L/R Output(DVD only)

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Connecting speakers

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To prevent damage to circuits, never short-circuit the positive (+) and negative (-) speaker wires.

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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.

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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.

◆

Before connecting

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This machine is designed to reproduce optimum sound quality when speakers with the specified impedance below are connected. Please check the

following information and choose speakers with appropriate impedance for the connections.

Front speakers / Center speaker / Surround Speakers : 6 ohms min. per speaker Woofer speaker : 4 ohms min.

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To prevent damage to circuits, never short-circuit the positive (+) and negative (-) speaker wires.

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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.

for EU version: optional

Surround speakerSurround speaker

Center speaker

Woofer speaker

Front speaker

Left ch.

Front speaker

Right ch.

Left ch.Right ch.

White

Black

Connecting to Equipment

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Connecting the supplied FM/MW(AM) antennas (option)

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Adjusting the position of the FM antenna

While listening to an FM program, extend the antenna and move it in various directions until the clearest signal is received, then secure the antenna with push pins in the position with the least distortion.

◆

Before connecting

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Refer also to the instruction manual of each USB Device to be connected.

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Before using the USB devices, make sure there is no disc on the machine.

USB function works only under the condition that the display shows “NO DISC” at DVD function mode.

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Connect the plugs securely.

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Connecting the USB device of Fresh memory type (option)

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Connecting the Microphone for KARAOKE

Firmware Upgrade

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Preparing the Firmware Upgrade

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Activating the Firmware Upgrade

1. Write a disc to Update file by PC Writing Program.

2. A size of dummy folder is more than 10M bite. (ex : font_dw, attached picture)

3. Put Firmware file (DVDROM.BIN) in a disc.

1. Open the Door of DVD Receiver.

2. Insert the Update Disc into the Disc Tray.

3. Close the Door, then DVD Receiver reads the disc, and Update the Firmware itself.

DISC LOADING

Internal Block Diagram of ICs

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74HC4052

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74L24

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EL817

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NJM4558M

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TL431

Internal Block Diagram of ICs

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MP7722

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CE2826

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LD1117ADT-R

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M29W800DB

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MP7782