Akai DVP-4797-KDMC Service Manual

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DVD PLAYER

Model:

DV P4797KDMC

SERVICE MANUAL

www.akai.ru

Daewoo DA Service Manual
Table of Contents
	Page
General Section..........................................................................................	2-5
Caution/Warnings
Safe Warnings
Precautions
Software Upgrade
Circuit Diagram and Component Layout.......................................................	6-26
MPEG IC Block Diagrams
Power supply Circuit Diagram and Component Layout
MPEG Circuit Diagram and Component Layout
Front panel Circuit Diagram and Component Layout
Servicing Procedures..............................................................................	27-33
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.............................................................................. ..................	34-37
Power Part List
MPEG Part List
Front Panel Part List
Karaoke Panel Part List

Page 1

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 batteries 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 chassis to either side of the power cord is less than 240 K ohms, the unit is defective.

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

Page 2

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.

CAUTIONINVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED AVOID EXPOSURE TO BEAM.

VORSICHTIUNSICHTBARE LASERSTRAHLUNG TRITT AUS. WENN DECKEL GEOFFNET UND WENN SICHERHEITSVERRIEGELUNG uBERBRuCKT IST. NICHT DEM STRAHL AUSSETZENI

VARNINGOSYNLIG 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 (moving 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 grounded 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 whose metal part is grounded since the laser diode or not resistant to static electricity.

Page 3

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 replace the Traverse Ass s when the Pickup Block needed to be replace . Do not touch the lens or lens holder of the Pickup Block.