NAD T-532-C Service manual

SERVICE MANUAL

MODELS : T512C/T532C/T512AH/T532AHSERVICE MANUAL

NAD ELECTRONICS INTERNATIONAL TORONTO

T512AH/T532AH

T512C/T532C/

DVD PLAYER

SERVICE MANUAL

T512C/T532C/

T512AH/T532AH

DVD PLAYER

T512C/T532C/

T512AH/T532AH

DVD PLAYER

CONTENTS

SECTION 1 . . . . SUMMARY

SECTION 2 . . . . CABINET & MAIN CHASSIS

SECTION 3 . . . . ELECTRICAL

SECTION 4 . . . . MECHANISM

SECTION 5 . . . . REPLACEMENT PART LIST

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

........................... 1-3

SERVICING PRECAUTIONS .................................................................................................. 1-4

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

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

1-3

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY.

SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER.

WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. LINE SHOCK.

SAFETY CHECKS

AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING.

SUBJECT : FIRE & SHOCK HAZARD

1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP.

2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.

3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.

4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.

5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUNING METAL SURFACES MUST BE AVOIDED.

6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.

SUBJECT: 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 MAG- NITUDE 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.

SUBJECT : X-RADIATION

1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIRABLE LEVELS.

2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR SETS, ALWAYS RE-INSTALL THEM.

3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA TION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE AT YOUR DISTRIBUTOR.

4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGULATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCEDURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON EACH CUSTOMER’S INVOICE.

5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES SIVE VOLTAGE.

6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE USED).

SUBJECT: IMPLOSION

1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.

2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.

SUBJECT : TIPS ON PROPER INSTALLATION

1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.

2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.

3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION.

4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS.

5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED.

6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS.

7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.’S OF THE SAME OR LARGER SCREEN SIZE.

8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

A.C. VOLTMETER

GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC

PLACE THIS PROBE ON EACH EXPOSED METAL PART

1-4

SERVICING PRECAUTIONS

CAUTION : Before servicing the DVD covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publications, always follow the safety precautions.

Remembers Safety First:

General Servicing Precautions

1. Always unplug the DVD AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnection or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an elec-

trolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Do not spray chemicals on or near this DVD or any of its assemblies.

3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required.

4. Do not defeat any plug/socket B+ voltage interlocks with whitch instruments covered by this service manual might be equipped.

5. Do not apply AC power to this DVD and/or any of its electrical assemblies unless all solid-state device heat sinks are cerrectly installed.

6. Always connect test instrument ground lead to the appropriate ground before connection the test instrument positive lead. Always remove the test instrument ground lead last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1 : Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES 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 ES 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 grouned-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protec tive package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally 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 ES device.)

1-5

SPECIFICATIONS

• GENERAL

Power requirements AC 120V, 60Hz(USA), AC 110~220V, 60Hz(EUROPE) Power consumption 14W Dimensions(approx.) 430 x 69 x 230mm (W/h/d) Mass(approx.) 3.4kg Operating temperature 5˚C to 35˚C (41˚F to 95˚F) Operating humidity 5% to 9%

• SYSTEM

Laser Semiconductor laser, wavelength 650nm Signal system NTSC(USA), NTSC/PAL(EUROPE) Frequency response DVD (PCM 96kHz): 2Hz to 44kHz

DVD (PCM 48kHz): 2Hz to 22kHz

CD: 2Hz to 20kHz Signal-to-noise ratio More than 100dB (ANALOG OUT connectors only) Harmonic distortion Less than 0.008% Dynamic range More than 95dB(DVD)

More than 95dB(CD) Wow and flutter Less than detected value (±0.001% W PEAK)

• OUTPUTS

VIDEO OUTPUTS 1V p-p, 75 ohms, sync negative S-V IDEO OUTPUTS (Y)1.0V(p-p), 75Ω, negative sync., Mini DIN 4-pin x 1

(C)0.3V(p-p), 75 ohms(EUROPE) Audio output(digital audio) 0.5V(p-p), 75Ω, RCA jack X 1 (TO TV) Audio output(optical audio) Optical connector x 1 Audio output(analog audio) 2.0Vrms (1kHz, 0dB),

330Ω, RCA jack (L, R) x 1 (TO TV)

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

1. DISASSEMBLY.........................................................................................................................2-2

CABINET DISASSEMBLY ............................................................................................................2-2

CIRCUIT BOARD DISASSEMBLY ...............................................................................................2-3

2. EXPLODED VIEWS ................................................................................................................2-4

1. Cabinet and Main Frame Section ...........................................................................................2-4

2. Packing Accessory Section....................................................................................................2-5

2-2

DISASSEMBLY

CAUTION BEFORE STARTING SERVICING

Electronic parts are susceptible to static electricity and may easily and damaged, so do not forget to take a proper grounding treatment as required. Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a magnetized screw driver in servicing. Several kinds of screws are used and some of them need special cautions. That is, take care of the tapping screws securing molded parts and fine pitch screws used to secure metal parts. If they are used improperly, the screw holes will be easily damaged and the parts can not be fixed.

(A)

Top Case

(A)

Tray Door

Disc Tray

Stopper

Front Panel

CABINET DISASSEMBLY

1. Top Case

1. Release 7 screws (A). (See Fig. 2-1)

2. Lift the top case with holding the back of it, and remove it in the direction of the arrow

Fig. 2-1

Fig. 2-2

Fig. 2-3

3. Front Panel

1. Eject the disc tray. (See Fig. 2-2)

2. Remove the tray door. (See Fig. 2-2)

3. Pull the front panel toward you while pressing 7 stoppers to disengage, and remove the front panel. (See Fig. 2-3)

2.Tray Door

1.Eject the disc tray.

2.Lift up the tray door in the direction of the arrow.

2-3

Interface Board

Main Circuit Board

(B)

(C)

Key Circuit Board

(D)

Fig. 2-4

Fig. 2-5

1. Disassembling of Main Circuit Board and Interface Board

1. Remove the top case.(See Fig. 2-1)

2. Remove 14 screw (B).

3. Remove the Deck from Main Circuit Board.

4. Remove Main Circuit Board from Interface Board.

5. Remove 2 screw (C).

6. Remove Interface Board from the chassis.

CIRCUIT BOARD DISASSEMBLY

Note: Before removing the main circuit board, be sure to shortcircuit the laserdiode output land.

After replacing the main circuit board, open the land after inserting the flexible connector. (Refer to Mechanism Disassembly)

2. Digitron and Key Circuit Board

1. Remove the front panel.(See Fig. 2-3)

2. Release 3 screws (D), and remove the digitron circuit board.

2-4

EXPLODED VIEWS

1. Cabinet and Main Frame Section

463

A48

463

A46

250

300

A43

283

280

452

465

467

275

A00

332

260

PBT00

NOTES) Warning

NOTES) Parts that are shaded are critical NOTES) With respect to risk of fire or NOTES) electricial shock.

BCD

2-5

2. Packing Accessory Section

BATTERY

808

PACKING SHEET

804

PACKING

OPTIONAL PARTS

803

806

813

OWNER'S MANUAL

RF CABLE

810

CABLE SET ASS'Y

801

REMOCON

900

BOX CARTON

802

PACKING

803

811

812

PLUG ASS'Y 1WAY

PLUG ASS'Y 2WAY

3-1

SECTION 3

ELECTRICAL

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE......................................................................3-2

1. Power(SMPS) Circuit ...............................................................................................................3-2

2. µ-com Circuit............................................................................................................................3-3

3. MPEG Circuit............................................................................................................................3-6

4. Front Circuit(Digitron & Key) ................................................................................................3-7

5. RF/Servo Circuit ......................................................................................................................3-8

BLOCK DIAGRAMS ..................................................................................................................3-12

1. Overall Block Diagram ..........................................................................................................3-13

2. Power (SMPS) Block Diagram ..............................................................................................3-14

3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................3-14

4. Audio Block Diagram ............................................................................................................3-15

5. MPEG & MEMORY Block Diagram .......................................................................................3-16

CIRCUIT DIAGRAMS................................................................................................................3-17

1. Power (SMPS) Circuit Diagram ............................................................................................3-17

2. DVD DSP Circuit Diagram.....................................................................................................3-19

3. Drive & RF Circuit Diagram ..................................................................................................3-21

4. MPEG Circuit Diagram ..........................................................................................................3-23

• WAVEFORMS ...........................................................................................................................3-25

5. Audio Circuit Diagram...........................................................................................................3-27

6. MEMORY Circuit Diagram.....................................................................................................3-29

7. FRONT Circuit Diagram.........................................................................................................3-31

8. A/V JACK Circuit Diagram ....................................................................................................3-33

• CIRCUIT VOLTAGE CHART ....................................................................................................3-35

PRINTED CIRCUIT DIAGRAMS ............................................................................................3-39

1. MAIN P.C.BOARD ...................................................................................................................3-39

2. POWER,A/V,FRONT P.C.BOARD ..........................................................................................3-41

3. KEY P.C.BOARD.....................................................................................................................3-43

3-2

ELECTRICAL TROUBLESHOOTING GUIDE

No 5V_D or 5V_A .

No 5.2VA.

Is 5.2VA section working?

Is oscillation present at the Base of Q108?

Replace Q108.

Check L103.

Replace BD101.

(Bridge rectifier)

Check Fuse(F101).

Is 5.2V applied to IC102 Pin 1?

Is there a DC voltage at the

(+) terminal of BD101?

Replace IC101.

Check R127, 128.

(SHUTDOWN CKT)

1. Power(SMPS) Circuit

No VF+

Is 5.2VA section working?

Replace D109.

Is oscillation present at the anode of D109?

YES

A. B.

3-3

Replace IC301.

Refer to Front Part

Check short

Reconnect it.

2. µ-COM Circuit

A. No Power

Does Logo appear

on the screen?

Is oscillation of

X501 normal?

Are IC503 Pins 193, 80

and 81 normal?

Does no DISC appear?

Does Hello

appear at FLD?

Is P5901

connected normally?

Is P5901 Pin 23 normal?

The waveform

on AD(00~21) of IC501

normal?

Are IC301 Pins 5, 26 normal?

Replace Main B/D.

Check the oscillation

Check short.

Replace IC501

Check power.

(Refer to power)

If power is normal

POWER ON

YES

NONO

B. Audio abnormal

D. Open/Close abnormal

Check the

connection of P5901.

Check IC301 Pins 3, 4.

Check Audio jack.

YES (If OK)

YES

(If OK)

YES

(If OK)

YES (If OK)

Check MPEG_CLK Signal of MPEG part.

Refer to Audio part.

Refer to MPEG part.

Replace B/D.

Check Front.

Reconnect it.

Refer to SERVO part.

Check the connection of MD.

AUDIO ABNORMAL

OPEN/CLOSE ABNORMAL

C. Video abnormal

Check Video jack.

YES (If OK)

Refer to Video part.

Refer to MPEG part.

Replace B/D.

VIDEO ABNORMAL

3-4

3-5

E. Picture abnormal

Check the disc.

If OK

YES (If OK)

Refer to Servo part

Check MPEG_CLK Signal of MPEG part

Check DSP

Check MPEG

YES (If OK)

Replace B/D

PICTURE ABNORMAL

F. Disc Error

Check Disc

YES (If OK)

Refer to Servo part

Replace B/D

DISC ERROR

Power is on

Does Logo appear

on the screen?

Does the

moving picture of the DVD Disc

play on the screen

normally?

Is MPEG data signal normal?

Is error signal normal?

Is MPEG data signal normal?

Is Clock normal?

Does the audio

sound output from MPEG

decoder?

Does the

moving picture of the video

CD play on the screen

normally?

Does the audio sound

output normally?

END

Check power & clock.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check CD/DVD DSP output

signal.

Check MPEG Decoder input

signal.

Check clock signal

YES

3. MPEG Circuit

_ OPTION

_ If included VCD function.

3-6

3-7

START

Does remote control

work normally?

Do all the

buttons work

normally?

Check waveform of

IC901 Pin 14.

Check waveform

of IC901 Pin 18, 19.

Is Digitron on normally?

LED ON?

Check waveform

of IC901 Pin 7.

Is oscillation of

X901 normal?

Is waveform of IC901

Pin 21 normal?

Check waveform

of IC901 Pin 14.

Does pulse

waveform of RC901 Pin 1

appear?

Is IC901

Pin 17 connected to

RC901 Pin 1 ?

Is RC901 Pin 2 5V?

Power on.

Check and replace R903,R912, R904, R905, R941, R906, R907.

Solder defective parts again.

Solder defective parts

Replace IC901.

Solder Key part.

Check Power.

Replace IC902.

Replace IC901.

Replace LED913.

Replace RC901.

Re-solder.

Recheck

Replace IC901.Complete repairing Front B/D.

NONONO

YES

YES YES

YES

YES YES

YES

4. Front Circuit (Digitron & key)

3-8

Does signal pulse

input to IC201 Pins 53, 54 when

the power is on?

Does signal goes

"High" to IC201 Pin186 when the

power is on?

Does

TTL pulse output to

IC201 Pin 156?

Does

33.8688MHz clock input to IC201 Pin 59?

Is IC201

Pins 79, 80, 84, 88 voltage

about 2.2V?

Replace IC201

(IC206 soldering or IC defect).

Check power circuit.

Check "2.µ-COM Part".

Replace X201 or IC206

(33MHz clock defect)

CHECK POINT(General)

5. RF/Servo Circuit

END

NO NO

YES

YESYES

YES

3-9

Does tray open or close?

Does the pick-up

slide inner or outer

track?

Fig.1. SLED Driver waveform

Fig.2. Focus Driver waveform

Does

the voltage change

at PMD03 Pins 7, 8 more than

2V on the basis of

3.8V?

Pressing

the open/close key

repeatedly, check the voltage of IC2M1

Pins 14, 15 change

0V to 5V

Does

PMD03 Pin 10 change

high to low?

Does

the pick-up lens move up

and down?

Check Focus Driver output.

(IC201 Pin 88, IC2M1 Pins 37, 38)

Check SLED Driver output.

IC201 Pin 80 IC2M1 Pins 28, 29.

IC201 Pin 80 no output : IC201 is defective IC2M1 Pins 26, 27 no output : IC2M1 is defective

IC201 Pin 88 no output : IC201 is defective IC2M1 Pins 37, 38 no output : IC2M1 is defective

DECK assembly is defective.

Slide the pick-up to

inner track.

.Power on

Check loading Part.

Push Pick-up to inner track to

the end by hand.

DECK assembly is defective.

(Limit sw)

check µ-COM Part.

Replace IC2M1.

No disc

END

YES

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