Zenith DVB412 Schematic

CONTENTS

SECTION 1 . . . .SUMMARY

SECTION 2 . . . .CABINET & MAIN CHASSIS

SECTION 3 . . . .ELECTRICAL

SECTION 4 . . . .MECHANISM

SECTION 5 . . . .REPLACEMENT PARTS 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

1-2

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 MAGNITUDE 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 110-240 V , 50/60 Hz

Power consumption: 12W

Dimensions (Approx.): 430 x 39 x 242 mm (W x H x D) without foot

Weight (Approx.): 2.2 kg

Operating temperature: 5 °C to 35 °C (41 °F to 95 °F)

Operating humidity: 5 % to 90 %

• OUTPUTS

VIDEO OUT: 1 Vp-p 75 Ω, sync negative, RCA jack x 1/ SCART (TO TV)

AUDIO OUT: 2.0 Vrms (1 KHz, 0 dB), 600 Ω,

RCA jack (L, R) x 1/ SCART (TO TV)

DIGITAL OUT (COAXIAL): 0.5 V (p-p), 75 Ω, RCA jack x 1

• System

Laser: Semiconductor laser, wavelength 650 nm

Signal system: PAL / NTSC

Frequency response: DVD (PCM 96 kHz): 8 Hz to 44 kHz

DVD (PCM 48 kHz): 8 Hz to 22 kHz

CD: 8 Hz to 20 kHz

Signal-to-noise ratio: More than 100 dB (ANALOG OUT connectors only)

Harmonic distortion: Less than 0.008%

Dynamic range: More than 90 dB (DVD/CD)

• Accessories

Video cable (1), Audio cable (1), Remote control (1), Batteries (2)

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

1. EXPLODED VIEWS ................................................................................................................2-2

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

2. Packing Accessory Section....................................................................................................2-3

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

BCD

250

463

A44

300

465

463

320

467

A46

SCART, 5.1CH MODEL ONLY

463

261

260

A00

463

A47

A41

279

KARAOKE MODEL ONLY

283

A48

261

A43

261

A49

452

261

280

452

A42

2-3

2. Packing Accessory Section

BATTERY

808

PACKING SHEET

804

PACKING

OPTIONAL PARTS

803

806

820

OWNER'S MANUAL

RF CABLE

810

CABLE SET ASS'Y

801

REMOCON

900

BOX CARTON

802

PACKING

803

811

812

PLUG ASS'Y 1WAY(YELLOW)

PLUG ASS'Y 1WAY(BLACK)

PLUG ASS'Y 2WAY

3-1

SECTION 3

ELECTRICAL

CONTENTS

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

1. Power check flow.....................................................................................................................3-2

2. System operation flow ............................................................................................................3-3

3. Test & debug flow ....................................................................................................................3-4

4. KARAOKE Flow (KARAOKE MODEL ONLY).......................................................................3-10

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ....................3-11

1. SYSTEM 27MHz CLOCK, RESET SIGNAL ...........................................................................3-11

2. SDRAM CLOCK......................................................................................................................3-12

3. TRAY OPEN/CLOSE SIGNAL ................................................................................................3-12

4. SLED CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-14

5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-14

6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)............................3-15

7. DISC TYPE JUDGEMENT WAVEFORM ................................................................................3-16

8. FOCUS ON WAVEFORM........................................................................................................3-17

9. SPINDLE CONTROL WAVEFORM(NO DISC CONDITION...................................................3-18

10. TRACKING CONTROL RELATED SIGNAL(System checking).........................................3-19

11. RF WAVEFORM ....................................................................................................................3-20

12. M3355 AUDIO OPTICAL AND COAXIAL OUTPUT(ASPDIF) .............................................3-20

13.M3355 VIDEO OUTPUT WAVEFORM...................................................................................3-21

14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-22

BLOCK DIAGRAMS ..................................................................................................................3-24

1. Overall Block Diagram ..........................................................................................................3-24

2. Power(SMPS) Block Diagram ...............................................................................................3-25

3. SERVO Block Diagram ..........................................................................................................3-26

4. MPEG & MEMORY Block Diagram .......................................................................................3-27

5. VIDEO & AUDIO Block Diagram ...........................................................................................3-28

6. KARAOKE Block Diagram(KARAOKE MODEL ONLY).......................................................3-29

CIRCUIT DIAGRAMS................................................................................................................3-30

1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-30

2. AV/JACK Circuit DIAGRAM...................................................................................................3-32

3. SYSTEM Circuit DIAGRAM ...................................................................................................3-34

4. DRIVER Circuit DIAGRAM.....................................................................................................3-36

5. TIMER Circuit DIAGRAM .......................................................................................................3-38

6. 5.1CH, SCART Circuit DIAGRAM .........................................................................................3-40

7. KARAOKE Circuit DIAGRAM(KARAOKE MODEL ONLY)...................................................3-42

• CIRCUIT VOLTAGE CHART ....................................................................................................3-44

PRINTED CIRCUIT DIAGRAMS ............................................................................................3-50

1. MAIN P.C.BOARD...................................................................................................................3-50

2. KEY P.C.BOARD.....................................................................................................................3-52

3. TIMER P.C.BOARD .................................................................................................................3-53

4. SCART & 5.1CH P.C.BOARD(OPTIONAL PART) .................................................................3-54

5. SMPS P.C.BOARD ..................................................................................................................3-55

3-2

ELECTRICAL TROUBLESHOOTING GUIDE

No 5V_A

No 5.2VA

Is 5.2VA section working?

Is 5.2V present at emitter of Q107?

Replace Q107.

Is there a DC voltage At (+) terminal of BD101?

Is there a DC voltage at R101?

Replace IC101.

Check F101

1. Power check flow

No VF+

Is 5.2VA section working?

Replace D102.

Check F102

YES

Replace R101.

YES

Replace BD101.

YES

A. B.

3-3

2. System operation flow

Power on

1.initializes SERVO, DSP and RISC registers

2.write RISC code to SDRAM

3.Reset RISC

Show LOGO

SLED at Inner Side?

SLED Moves to Inner Position

Tray Closed?

Tray Close to closed position

1.Judge whether have disc and disc type

2.Jump to related disc reading procedure

Received

Open/close key?

1.Execute Pressed Key and IR Key

2.System operation on routine loop

1.Stop playback and open tray

2.Display tray open message and LOGO

Receive

close key?

yes

no yes

3-4

3. Test & debug flow

Test

Check the AC Voltage

(110V or 220V)

Switch on the Power PCBA

Check the Power PART

the DC Voltage

Outputs OK? (5.2V,5V,1.8V

,3.3V,8V,12V)

Check the Power PART

3.3V, 1.8V,5V,12V and 8V outputs normal on main

PCB

Check the IC105 or diode

Connect to PC RS232 Cable and

Update the flash memory code

Update

Flash(IC502)

Successfully?

1.Check 27MHz system clock.

2.Check system reset circuit.

3.Check flash R/W enable signal PRD

4.Check RS232 Signals

5.Check flash memory related circuit

Replace flash(IC502)

Yes

yes

Yes

3-5

Show LOGO

yes

Reset or Power on

Flash

Memory operates

Properly?

Check connection on lines between FLASH & M3355 and the FLASH access time whether is suitable or not.

SDRAM

works properly?

Check connection lines between SDRAM(IC503) & M3355 and the SDRAM is damaged.

M3355

VIDEO outputs

properly?

Check the related circuit of M3355. (IC501 PIN 2.3.7.8 check)

Have

TV signal output?

Does

Tray move inside

when it is not at closed

position?

Check the filtering and amp circuit of

TV signal .(IC604)

No No

YES

Normal

TROUT & TRIN

signals?

Check the load OPEN &

CLOSE switch

Normal

TRCLOSE &TROPEN

signal?

Check the Tray control IO pins

on M3355.

Normal

LOAD+ & LOAD

signal

Check the Tray control amplifying

circuit on Motor driver.(IC201)

Check the cable connection between

main PCBA and loader. (MECHA)

Check AV cable

connection to TV set

YES

3-6

Does

the SLED move

to inner side when it is at

outer position

on?

Yes

Motor

Driver DRVSB

Pin is High?

Check the connection line of

DRVSB signal

Motor

Driver DRVSB

Pin is High?

Check the related circuit of

FOCUS.

SLED+

and SLED- output

properly ?

Check the amp circuit on

motor driver.

Check the cable connection

with MECHA.

Optical

Lens has movements

for searching

Focus?

Proper Focus outputs

to motor driver?

Check Focus connection on

M3355 and motor driver.

Proper F+

& F- outputs?

Check the amp circuit on

motor driver.

Check cable connect on with

pick-up head.

yes

Do not put in disc and tray

close.

Yes

3-7

Laser turns on when

reading disc?)

Yes

LD01 or LD02 output

properly?

Check the laser power circuit

on M3355 and connecting to

power transistor. (Q201, Q202)

Collector voltage of power transistor is OK?

( Q201, Q202)

Check the related circuit on

laser power TR

Yes

Check cable connection between

transistor output and pick-up head.

Check the RF connection between MD and M3355.

Put disc in?

Proper RF signal?

Laser off

Check the related circuit

on M3355 RF signal

Does spindle rotate?

Disc ID is correct?

Proper

Spindle signal on

M3355

Check spindle related

circuit on M3355

Proper RF signal?

Check the related circuit

on M3355 RF signal

Check the RF connection between MD and M3355.

Yes

3-8

Focus ON OK?

Yes

Proper

signals on A, B, C,

D of M3355

Check the related circuit

on M3355 SBAD signal .

Check the related circuit

on M3355

.Proper SBAD signal

on M3355?

Check connections between

M3355 and pick-up head.

Track On OK?

Check cable connection on

pick-up head.

Proper tracking signal

on M3355?

Proper

M3355 track signal

on M3355?

Check the related

circuit on M3355

Check the track connection

on M3355 and motor driver.

Yes

. Proper FE signal

on M3355?

Check the related circuit

on M3355 FE signal

Disc is play?

T+ & T- output

properly?

Check the tracking control

amp circuit on motor driver.

Check RF signal waveform.

Yes

3-9

Normal

Audio output

when disc playback?

DAC received

correct data

stream?

Check connection between M3355

& Audio DAC. (Check DAC_RST#,

SER3, BCLK, LRCK,MCLK

Normal

Audio DAC

out? (IC601)

Check the related circuit of

Audio DAC. (Check Audio

out Pin 14, 15,18,19)

Check Audio filter, amplify, mute

circuit. (IC602 Application circuit)?

TEST END

Communications

between IR.VFD Front panel key

& M3355 & Front u-com(IC901)

is normally?

Check communication lines

on M3355.

Check the cable connection

on Front panel.

Yes

Normal

IR. VFD & Front

panel key

functions?

Yes

No No

NoNo

Yes

3-10

Start

Insert the MIC jack

Is the MIC signal at the

IC801 pin3.

Does the MIC

signal input to the IC501

pin213.

Is the MIC signal at the

IC801 pin2.

Replace IC501

Check pattern

Replace the VR801

Replace IC801

Is the MIC signal at the

IC801 pin3 normal?

Replace the mic jack

Yes

4. KARAOKE Flow(KARAOKE MODEL ONLY)

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