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S/M No:OSDMK42001

Model : DM-K 42

Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list.

Dec . 2004
Daewoo DM-K42 Service Manual

Table of Contents
page
General Section ............................................................................ 2
Cautions/Warnings
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 ...................................................................... 28
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 .......................................................................... 36
Power parts list
MEPG parts list
Front panel parts list

Page 1
Daewoo DM-K42 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 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.

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

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Daewoo DM-K42 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

Page 3
Daewoo DM-K42 Service Manual

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 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

Page 4
Daewoo DM-K42 Service Manual

2. Circuit Diagram and Component Layout
2.1. MPEG IC Block Diagrams

Fig. 2-1 ZR36768/762

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Daewoo DM-K42 Service Manual

Fig. 2-2 DRC block diagram

Fig.2-3 CSTP block diagram

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Daewoo DM-K42 Service Manual

Fig.2-4 Vaddis ZR36768/762 block diagram

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Daewoo DM-K42 Service Manual

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Daewoo DM-K42 Service Manual

2.2.Power supply Circuit Diagram and Component Layout

Fig 2-5 Power Supply Circuit Diagram

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Daewoo DM-K42 Service Manual

Fig 2-6 Power Supply Assembly Drawing

Fig 2-7 Power Supply Composite

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Daewoo DM-K42 Service Manual

2.3. MPEG Circuit Diagram and Component Layout
2.3.1. MPEG Circuit Diagram

Fig 2-8 ZR36762/ZR36768&SDRAM

Fig2-9 RF AMPLIFIER&DRIVER

Page 22
Daewoo DM-K42 Service Manual

Fig 2-10 AUDIO&VIDEO FILTER

Fig 2-11 MEMORY

Page 23
Daewoo DM-K42 Service Manual

Fig 2-12 POWER&AV PORT

2.3.3. MPEG Composite (Fig 2-14)

Page 24
Daewoo DM-K42 Service Manual

2.3.2. MPEG Assembly Drawing (Fig 2-13)

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Daewoo DM-K42 Service Manual

2.3.2. MPEG Assembly Drawing (Fig 2-13)

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Daewoo DM-K42 Service Manual

Page 27
Daewoo DM-K42 Service Manual

2.4. Front panel Circuit Diagram and Component Layout

Fig 2-16 Front Panel Circuit Diagram

Fig 2-17 Front Panel Assembly Drawing

Fig 2-18 Front Panel Composite

Page 28
Daewoo DM-K42 Service Manual

3. Servicing Procedures
3.1. Power Supply Trouble Service Flow Chart

Power Supply
Block Trouble

NG
Check F901 Condition Replace F901

Check F901 NG
Pin4/Pin6/ Pin8 Replace F901
Condition

Check on D101/D102/
D103/D104/D105
Output Voltage Condition

Check on Q103 Pin1 NG
Replace Q103
Voltage Condition 2~5V

NG
NG
Replace U302 Replace TR901

OK
OK

Check CON1~4
Output Voltage

Page 29
Daewoo DM-K42 Service Manual

3.2. Read Disc Trouble Service Flow Chart
Read disc problem in a DVD player is a very complicated issue that
may involve complex issues. This problem is not only relation to the
electronic circuit, but also very much relation to the operation
environment.
DVD loading unit is a very complicate part that contains big number of
ESD components, which require specific equipment, tools and
technique to repair; in general, service technician is not suggested to
disassemble the DVD loading unit. It is suggest proving the trouble
and replacing the complete DVD loading unit, instead of repairing the
DVD loading unit in local workshop.
It is suggested to prove the faulty of a DVD loading unit by
replacement by a good DVD loading unit.
Before checking the "NO Disc" Trouble, ensure excluding the
following possibilities:
The test disc is damage.
AC power supply voltage dropped below the minimum required
level.
DVD disc region code and color system is not matching to the
DVD player or system setting.
Moisture condensed inside the unit. (Power on the unit, without
disc loaded, for 1/2 to 2 hours).

Service Flow Chart

Read DISC Trouble

Check DVD LOADER NG
Replace Connector
Connector Condition

Replace DVD Loading Unit

Check the MEPG ATAPI Check the other Parts by

I/F Interface Circuit Replacement Method

Page 30
Daewoo DM-K42 Service Manual

3.3. Video Trouble Service Flow Chart
3.3.1. Composite Video Trouble Service Flow Chart

Composite Video Trouble

NG
Check "SETUP" Item See "User Manual"

OK
NG
Check Y1 Output Signal Replace Y1 Parts

OK
NG
Check C128/R106 Signal Replace C128/U1/R106

OK
NG
Check C130 Signal Replace C130/L9

OK
OK
Check CN8 Pin Signal Check External Set

Replace CN8

Page 31
Daewoo DM-K42 Service Manual

3.3.2. S-Video Trouble Service Flow Chart

Composite Video Trouble

NG
Check "SETUP" Item See "User Manual"

OK
NG
Check Y1 Output Signal Replace Y1 Parts

OK
NG
Check C122/C125 Signal Replace C122/C125 or U1

OK
NG Replace C124/L7/R104
Check C124/C127 Signal
or C127/L8/R105

OK
NG
Check CN17 Signal Check External Set

Replace CN17

Page 32
Daewoo DM-K42 Service Manual

3.4. Composite Analogy Audio Trouble Service Flow Chart

Composite Analogy Audio Trouble

NG
Check R8 Signal Replace U1

OK
NG
Check U10 Pin1~3 Signal Replace U1

OK
NG
Check U10 Pin7 +5V Check Power Supply

OK
NG
Check U10 Pin5/8 Signal Replace U10

OK
NG Check U11 between
Check U11 Pin2/6 Signal
Pin2/6 and Pin3/5 Parts

OK
NG
Check U11 Pin4/8 +/-12V Check Power Supply

OK
NG
Check U11 Pin1/7 Signal Replace U11

Check Q15/Q16 Mute Parts

Page 33
Daewoo DM-K42 Service Manual

3.5. Digital Audio Trouble Service Flow Chart

Digital Audio Trouble

NG
Check "SETUP" Item See "User Manual"

OK
NG
Check U5 Pin9 Signal Replace U1

OK
NG
Check U5 Pin8 Signal ReplaceU5

OK
NG
CheckR130 Signal Check External Set

OK
NG
Check C147 Replace C147

OK
NG
Check R132 Replace R132/R133/C148

Check External Set

Page 34
Daewoo DM-K42 Service Manual

3.6. Front Control Trouble Service Flow Chart

Front Control Trouble

NG
Check between JP2 and CN903 Connection

OK Replace

Check between JP1 and CN2 Connection
NG
OK
NG
Check U2 Pin9/25Voltage See: 3.1

Check U2 OK
OK Replace VFD
SEG Signal

OK
Check U1 Pin1/2/15/16 Voltage Replace U2

Replace U1

Page 35
Daewoo DM-K42 Service Manual

3.7. Remote Control Trouble Service Flow Chart

Remote Control Trouble

NG NG
Check Remote Control Replace Battery Replace Control

OK
NG
Check U3 Pin2 Voltage Check Power Supply

OK
NG
Check U3 Pin3 Output Signal Replace U3

OK
NG
Check U1 Pin201 Input Signal Replace L23

Replace U1

Page 36
Daewoo DM-K42 Service Manual

4. Parts List
4.1. Power parts list
NO. PART NO. DESCRIPTION QTY LOCATION

Carbon Resistor
1 M2R1130330433110 RT14-1/4W-30K

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