Vitek VT-4006 Service manaul

VT-4006 Service Manual

CUSTOMER MODEL: VT-4006

VT-4006 Service Manual

Table of Contents

Page

General Section..........................................................................................2-4

Caution/Warnings

Safe Warnings

Precautions

Software Upgrade

Circuit Diagram and Component Layout.......................................................5-27

MPEG IC Block Diagrams

Power supply Circuit Diagram and Component Layout

MPEG Circuit Diagram and Component Layout

Front panel Circuit Diagram and Component Layout

Out Board Circuit Diagram and Component Layout

Servicing Procedures..............................................................................28-34

Power Supply Trouble Service Flow Chart

Read Disc Trouble Service Flow Chart

Video Trouble Service Flow Chart

Composite Analogy Audio Trouble Service Flow Chart

Digital Audio Trouble Service Flow Chart

Front Control Trouble Service Flow Chart

Remote Control Trouble Service Flow Chart

Parts List.............................................................................. ..................35-39

Power Part List

MPEG Part List

Front Panel Part List

Out Board Part List

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VT-4006 Service Manual

1. General Section

1.1 Cautions/Warnings

1.1.1 Product Safety Notice

Parts marked with the symbol in the schematic diagram have critical char-

acteristics.

Use ONLY replacement pares recommended by the manufacturer.

It is recommended that the unit be operated from a suitable DC supply or batter-

ies during initial check out procedures.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

WARNING HIGH VOLTAGE INSIDE TO PREVENT

ELECTRICAL SHOCK DO NOT REMOVE ANY CO-

VER OR SCREW. REFER ALL SERVICING TO QU-

ALIFIED SERVICE PERSONNEL. DO NOT ALLOW

THIS PRODUCTION BE EXPOSED TO RAIN OR

MOISTURE. DISCONNECT THIS MAINS PLUG

FROM THE SUPPLY SOCKET WHEN NOT IN

USE.

1.1.2 Leakage Current Check/Resistance Check

Before returning the unit to the customer, make sure you make either (1) a

leakage current check or (2) a line to insulated resistance check.

If the leakage current exceeds 0.5 milliamps , or if the resistance from chas-

sis to either side of the power cord is less than 240 K ohms, the unit is defec-

tive.

WARNING: DO NOT return the unit to the customer until the problem or loca-

ted and corrected.

1.2. Safe Warnings

1.2.1. Protection of Eyes from Laser Beam

To protect eyes from invisible laser beam during servicing

DO NOT LOOK AT THE LASER BEAM

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VT-4006 Service Manual

1.2.2 Laser Caution CAUTION

Adjusting the knobs, switches, and controls , ect. Or taking actions not specified herein may result in a harmful emission of laser beams. This CD Changer must be adjusted and repaired only by qualified serv ice personnel.

CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED AVOID EXPOSURE TO BEAM. VORSICHTI- UNSICHTBARE LASERSTRAHLUNG TRITT AUS. WENN DECKEL GEOFFNET UND WENN SICHERHEITSVERRIEGELUNG uBERBRuCKT IST. NICHT DEM STRAHL AUSSETZENI VARNING- OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD OCH SPARR AR URKOPPLAD STRALEN AR FARLIG. ADVARSEL-USYNLIG LASERSTRALING VED ABNING NAR SIKKERHEADSAFBRYDERE ER UDE AF FUNKTION. UNDGA UDSAETTELSE FOR STRALING.

CLASS 1 LASER PRODUCT LUOKAN 1 LASERLAITE KLASS 1 LASERAPPARAT

THIS IS COMPACT DISC PLAYER IS CLASSIFIED AS A CLASS LASER PRODUCT. THE LASS 1 LASER PRODUCT LABEL IS LOCATED ON THE REAR EX TERIOR.

1.3. Precautions

1.3.1. ESD Precautions in Repairing

1.3.1.1 Do not apply excessive pressure on the mechanical parts (movi ng pares), including the Pickup Block, as extremely high mechanical pre cision or required in these parts.

1.3.1.2 When soldering the microprocessor and signal processing IC s, use a ceramic soldering iron or a soldering iron whose metal part is grou nded since they are not resistant to static electricity.

1.3.1.3 When removing the solder or soldering the laser shorting lands for the Pickup Block, use a ceramic soldering iron or a soldering iron wh ose metal part is grounded since the laser diode or not resistant to static electricity.

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VT-4006 Service Manual

1.3.2. DVD Loading Unit Precautions When handing the Mechanism Block

1.3.2.1 Do not loosen any screws in the Pickup Block.

1.3.2.2 Do not adjust any screws in the Mechanism Block except for Tilt Adjust Screws , as they are adjusted precisely at the factory.

1.3.2.3 Replacement of the Pickup Block is impossible. Always repl ace the Traverse Ass s when the Pickup Block needed to be replace . Do not touch the lens or lens holder of the Pickup Block.

1.3.2.4 The Guide Rails of the Pickup Block are greased. Take care wh en handing.

1.3.2.5 When you try to slide the Pickup Block, do not press or pull it directly, Always turn the dive gears with your fingers.

1.3.2.6 Be sure that the anti-slipping rubber on the turnable or clean. If there is dust or it is greasy,clean the part with the liquid that contains 50% each of alcohol and water.

1.3.2.7 When removing the Mechanism P.C.B. Ass s, you need to sho rt-circuit the laser diode shorting lands beforehand.

1.4. Software Upgrade

You can upgrade DVD player using the software we provide as following step:

Creating a software upgrade CD

Use only a new CD-R/CD-RW(not an erased one)

Give the CD a name of your choice(e.g. Version and unit name)

Burn the unpacked documents on the CD-D/CD-RW.

The root directory(uppermost level)of the software upgrade CD.

Attention: If a failure should occur during the software upgrade(e.g a mains failure),

it may happen that the units function and a restart of the upgrade function are no

longer possible.If this should be the case,you must replace the intergraded FLASH

ICs with preprogrammed ICs (see corresponding spare parts list).

Insert the upgrade CD (see corresponding spare parts list) and observe the

hints on the display and on the screen of the TV set.

Carry out an initialization of the set.

Displaying the Software Version Number

Press one after the other the STOP and EJECT buttons on the unit.

Press the OSD with the remote control.

Using the cursor buttons on the remote control ,select the software version

MICRO Version or CUSTOMER VERSION .The respective software version

number then is displayed.

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VT-4006 Service Manual

2. Circuit Diagram and Component Layout

2.1 MPEG IC Block Diagrams

Page 5

Table1: MT1389D Pin Description

VT-4006 Service Manual

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