DAC DNW-552 Service manual

Daewoo DN-W551 Service Manual

Daewoo DN-W552 Service manual

Table of Contents

General Section …………………………………………………………………. 2

Cautions/Warnings

page

Safe Warnings Precautions

Software Upgrade

Circuit Diagram and Component Layout ……………………………………… 5

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 ……………………………………………………………. 22 Power Supply Trouble Service Flow Chart

Read Disc Trouble Service Flow Chart Video Trouble Service Flow Chart Digital Audio Trouble Service Flow Chart Composite Analogy Audio Trouble Service Flow Chart Front Control Trouble Service Flow Chart

Remote Control Trouble Service Flow Chart

Parts List

Power parts list Front panel parts list MEPG parts list

……………………………………………………………….. 30

1. General Section

1.1.

Cautions/Warnings

1.1.1. Product Safety Notice Parts marked with the symbol in the schematic diagram have critical characteristics. 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.

Daewoo DN-W551 Service Manual

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

Daewoo DN-W551 Service Manual

1.2.2. Laser Caution

CAUTION

Adjusting the knobs, switches, and controls, etc. 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 service personnel.

Laser symbol:

THIS IS COMPACT DISC PLAYER IS CLASSIFIED AS A CLASS 1 LASER PRODUCT.

THE LASS 1 LASER PRODUCT LABEL IS LOCATED ON THE REAR EXTERIOR.

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 precision 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.

1.3.2. DVD Loading Unit Precautions when handling 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

Daewoo DN-W551 Service Manual

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’y when the Pickup Block needed to be replaced. 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 when 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 turntable 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’y, you need to short-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-R/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