Daewoo 715B Service manual

Service Manual

XGA COLOR MONITOR

Model : 715B

DAEWOO ELECTRONICS CO., LTD.

http : //svc.dwe.co.kr

CONTENTS

SAFETY PRECAUTIONS

GENERAL SAFETY INFORMATION

SERVICING PRECAUTIONS

TECHNICAL INFORMATION

GENERAL INFORMATION

PIN CONNECTOR

CAUTIONS FOR ADJUSTMENT AND REPAIR

OPERATION AND ADJUSTMENT

ALIGNMENT PROCEDURE

TROUBLESHOOTING HINTS

BLOCK DIAGRAM

PCB LAYOUT

SCHEMATIC DIAGRAM

EXPLODED VIEW & MECHANICAL PARTS LIST

INFORMATION OF PART DESCRIPTION

ELECTRICAL PARTS LIST

35

36

37

38

13

15

31

32

8

9

7

8

3

6

1

2

S

AFETY PRECAUTIONS

CAUTION: No modifications of any circuits should be attempted. Service work should be performed only after you are thoroughly familiar with all of the following safety checks and servicing guidelines.

◆ Safety Check

Care should be taken while servicing this analog color display because of the high voltages used in the deflection circuits.

These voltages are exposed in such areas as the associated flyback and yoke circuits.

◆ Fire & Shock Hazard

• Insert an isolation transformer between the analog color display and AC power line before servicing the chassis.

• When servicing, pay close attention to the original lead dress especially in the high voltage circuit area; if a short circuit is found, replace all parts which have been overheated as a result of the short circuit.

• All the protective devices must be reinstalled per original design.

• Soldering must be inspected for possible cold solder points, frayed leads, damaged insulation, solder splashes or sharp solder points. Be certain to remove all foreign materials.

◆ Implosion Protection

Picture tube in this monitor employs integral implosion protection system, but care should be taken to avoid damage and scratching during installation.

Only use same type replacement picture tubes.

IMPORTANT SAFETY NOTICE: There are special components used in this analog color display, which are important for safety. These parts are shaded on the schematic diagram and on the replacement parts list. It is essential that these critical parts should be replaced with manufacturer’s specified parts to prevent X-Ray, shock, fire or other hazards. Do not modify the original design without getting written permission from DAEWOO

ELECTRONICS CO. or this will void the original parts and labor warranty.

◆ X-Ray

WARNING: The only potential source of X-Ray is the picture tube. However when the high voltage circuitry is operating properly, there is no possibility of an X-Ray problem. The basic precaution which must be exercised is to keep the high voltage at the following factory recommended level.

NOTE: It is important to use an accurate, periodically, calibrated high voltage meter.

• To measure the high voltage, use a high-impedance high-voltage meter.

Connect(-) to chassis and (+) to the CRT anode button.

• Turn the Contrast & Brightness Control fully counterclockwise.

• Measure the high voltage. The high voltage meter should indicate the following factory recommended levels.

• If the upper meter indication exceeds the maximum level, immediate service is required to prevent the possibility of premature component failure.

• To prevent X-Ray possibility, it is essential to use the specified picture tube.

• The normal high voltage is 25.5KV or below and must not exceed 29KV at zero beam current at rated voltage.

1

GENERAL SAFETY INFORMATION

◆ Terms in the manual

CAUTION Statements identify conditions or practices that could result in damage to the equipment or other property.

WARNING Statements identify conditions or practices that could result in personal injury or loss of life.

◆ Terms as marked on equipment

CAUTION Statements indicate a personal injury hazard not immediately accessible as one reads the marking or a hazard which is properly included on the equipment itself.

WARNING Statements are clearly concerning indicated personal injury hazards.

◆ Symbols in the manual

The symbols indicate where applicable cautionary or other information is to be found.

◆ Symbols as marked on equipment

Protective GROUND terminal

◆ High Voltage Warning

And Critical Component Warning Label

The following warning label is on the CRT PWB shield case inside the unit.

Warning: This product includes critical mechanical and electrical parts which are essential for x ray protection. For continued safety, replace critical components that are indicated in the service manual with exact replacement parts given in the parts list.

Operating high voltage with this product is 29Kv at minimum brightness. Refer to service manual for measurement procedures and proper service adjustments.

2

SERVICING PRECAUTIONS

CAUTION: Before servicing instruments covered by this service manual, its supplements, and addendum, please read and follow the SAFETY PRECAUTIONS of this manual.

NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 1 of this manual, always follow the safety precautions.

Remember: Safety First.

◆ General Servicing Precautions

1. Always unplug the AC power cord from the AC power source before: a. Removing or reinstalling any component, circuit board, module, or any other instrument assembly.

b. Disconnecting or reconnecting any electrical plug or other electrical connection.

c. Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.

CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in a explosion.

d. Discharging the picture tube anode.

2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM. etc.) equipped with a suitable high voltage probe. Do not test high voltage by “drawing an arc”.

3. Discharge the picture tube anode only by: (a) first connecting one end of an insulated clip lead to the degaussing or line grounding system shield at the point where the picture tube socket ground lead is connected, and then (b) touching the other end of the insulated clip lead to the picture tube anode button, using an insulating handle to avoid personal contact with high voltage.

4. Do not any spray chemicals on or near this instrument, or any of its assemblies.

5. Unless otherwise specified in this service manual, only clean electrical contacts by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick, or comparable nonabrasive applicator: 10% (by volume) Aceton and 90% (by volume) isopropyl alchohol (90%-99% strength).

CAUTION: This is a flammable mixture. Unless specified in this service manual, lubrication of contacts is not required.

6. Do not damage any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped.

7. Do not apply AC power to this instrument and/or any other of its electrical assemblies unless all the solid-state device heat sinks are correctly installed.

8. Always connect the test instrument ground lead to the appropriate instrument chassis ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last.

9. Only use the test fixtures specified in this service manual with this instrument.

CAUTION: Do not connect the test fixture ground strap to any heatsink in this instrument.

3

◆ Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity.

Such components are commonly called Electrostatically Sensitive (ES) Devices.

The typical examples of ES devices are integrated circuits, 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, wipe off any electrostatic charge on your body by touching any 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 testing conditions.

2. After removing the electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge buildup or exposure to the assembly.

3. Only use a grounded-tip soldering iron to solder or unsolder ES devices.

4. Only use an anti-static type solder removal device. Some solder removal devices not classified as “antistatic” can generate enough electrical charges to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate enough electrical charges to damage ES devices.

6. Do not remove a replacement ES device from its protective 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 replacement ES devices, touch the protective material to the chassis or circuit assembly into which the device will be installed.

CAUTION: Be sure that no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily movements when handling unpackaged replacement ES devices. (Otherwise harmful motion such as the brushing together clothes fabric or the lifting your foot from a carpeted floor can generate enough static electricity to damage ES devices).

◆ General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron with appropriate tip size and shape that will maintain tip temperature between a 550°F-660°F (288°C-316°C) range.

2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.

3. Keep the soldering iron tip clean.

4. Throughly clean the surface to be soldered. Use a small wire-bristle (0.5 inch or 1.25cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners.

5. Use the following soldering technique: a. Allow the soldering iron tip to reach normal temperature (550°F to 660°F or 288°C to 316°C) b. Hold the soldering iron tip and solder strand against the component lead until the solder melts.

c. Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil, and hold it there until the solder flows onto and around both the component lead and the foil.

d. Closely inspect the solder area and remove any excess or splashed solder with a small wire-bristle brush.

CAUTION: Work quickly to avoid overheating the circuit board printed foil.

4

FIGURE 1. USE SOLDERING IRON TO PRY LEADS

◆ IC Removal/Replacement

Some utilized chassis circuit boards have slotted (oblong) holes through which the IC leads are inserted and then bent flat against the circuit foil. When holes are slotted, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 on the page under the title of general soldering guidelines.

◆ Removal

1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.

2. Draw away the melted solder with an anti-static suction-type solder removal device (or with desoldering braid before removing the IC.

◆ Replacement

1. Carefully insert the replacement IC in the circuit board.

2. Carefully bend each IC lead against the circuit foil pad and solder it.

3. Clean the soldered areas with a small wire-bristle brush. (lt is not necessary to reapply acrylic coating to the area).

◆ “Small-Signal” Discrete Transistor Removal/Replacement

1. Remove the defective transistor by clipping its leads as close as possible to the component body.

2. Bend the ends of each of three leads remaining on the circuit board into a “U” shape.

3. Bend the replacement transistor leads into a “U” shape.

4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the “U” with long nose pliers to ensure metal-to-metal contact, then solder each connection.

5

◆ Power IC, Transistor or Devices Removal/Replacement

1. Heat and remove all solders from the device leads.

2. Remove the heatsink mounting screw (if applicable).

3. Carefully remove the device from the circuit board.

4. Insert new device in circuit board.

5. Solder each device lead and then clip off excess lead.

6. Replace heatsink.

◆ Diode Removal/Replacement

1. Remove defective diode by clipping its leads as close as possible to diode body.

2. Bend the two remaining leads perpendicularly to the circuit board.

3. Observing diode polarity, wrap each lead out of the new diode around the corresponding lead on the circuit board.

4. Securely crimp each connection and solder it.

5. Inspect the solder joints of the two “original” leads on the circuit board copper side. If they are not shiny, reheat them and apply additional solder if necessary.

TECHNICAL INFORMATION

CDT Size

Diagonal visible image area

Dot Pitch

Synchronization Horizontal

Vertical

Plug and Play

Power Saving

Power Source

Power Consumption

Dimension-W x H x D

(set with stand)

Weight-unpacked(lbs/Kg)

Operating Temperature

17-inch

16.2-inch

0.28 mm

30 - 70 KHz

50 - 160 Hz

DDC1/2B/CI

EPA, VESA DPMS, Nutek Compliant

100-240 Vac, 50/60Hz (Free Voltage)

95W

420 x 453 x 429mm

33.9/15.4

10 ~ 40°C /50 ~ 104°F

6

GENERAL INFORMATION

This color monitor automatically scans all horizontal frequencies from 30KHz to 70KHz, and all vertical frequencies from 50Hz to 160Hz. This color monitor supports IBM PC, PC/XT, PC/AT, personal

System/2 (PS/2), Apple Macintosh, and compatible users crisp text and vivid color graphics display when using the following graphics adapters : (VGA, 8514/A, Super VGA, VESA and XGA and Apple

Macintosh Video Card). And so, this color monitor has a maximum horizontal resolution of 1280 dots and a maximum vertical resolution of 1024 lines for superior clarity of display.

By accepting analog signal inputs which level is zero to 0.7 Volts. This color monitor can display and unlimited palette of colors depending on the graphics adapter and software being used.

◆ Abbreviations

ADJ

AFC

CRT

Def

D.Y

FBT

H.SYNC

OSC

P.S.U

PWA

R.G.B

V.Sync

Adjustment

Automatic Frequency Control

Cathode Ray Tube

Deflection

Deflection Yoke

Flyback Transformer

Horizontal Synchronization

Oscillator

Power Supply Unit

Printed Circuit Board Wiring Assembly

Red, Green, Blue

Vertical Synchronization

7

PIN CONNECTOR

Pin Signal

12

13

14

15

8

9

10

11

6

7

4

5

1 Red

2 Green

3 Blue

GND

GND

GND - Red

GND - Green

GND - Blue

+5Vdc

GND - H.Sync

GND - V.Sync

Bi-directional Data (SDA)

Horizontal Sync

Vertical Sync (VCLK)

Data Clock (SCL)

1

6

15

10

Arrangement of 15-pin D-sub connector

CAUTIONS FOR ADJUSTMENT AND REPAIR

• Degaussing is always required when adjusting purity or convergence.

• The white balance adjustment has been done by a color analyzer in factroy. The adjustment procedure, described in the service manual is made by a visual check.

• Allow 20 minutes warm-up time for the display before checking or adjusting only electrical specification or function.

• Reform the leadwire after any repair work.

◆ Caution For Servicing

• In case of servicing or replacing CRT, high voltage sometimes remains in the anode of the CRT. Completely discharge high voltage before servicing or replacing CRT to prevent a shock to the serviceman.

8

OPERATION AND ADJUSTMENT

Control Panel

SELECT A D J U S T MENU

MENU

•

Launch OSD(On-Screen Display) MENU window.

SELECT

•

Select a sub Menu & function.

•

Move a sub Menu & function.

•

Increase the value of any selected function.

•

Adjust the contrast directly when there is no OSD.

•

Move a sub Menu & function.

•

Decrease the value of any selected function.

•

Adjust the brightness directly when there is no OSD.

9

Key Process

MENU

SELECT

MENU

MENU MENU

OSD OFF

•

When you choose the icon on the OSD window, you can exit the OSD screen.

10

OSD Functions

ICON CONTROL FUNCTIONS

H. POSITION Adjust the position of the display horizontally (left or right).

V. POSITION Adjust the position of the display vertically (up or down).

H.SIZE

Adjust the display width (horizontal size).

V.SIZE

Adjust the display height (vertical size).

V. LINEARITY Adjust the vertical linearity.

H. LINEARITY Adjust the horizontal linearity.

PINCUSHION Adjust the left and right margins for more convex or more concave margins.

TRAPEZOID Adjust the trapezoid of the screen by moving the lines inward or outward.

PIN BALANCE Adjust the side balance when the sides of the screen are bowed towards left or right.

PARALLELOGRAM Adjust the parallelogram when the screen is leaning left or right.

T. PIN CORNER Adjust the pin corner top when the top sides of the screen are bowed.

B. PIN CORNER Adjust the pin corner bottom when the bottom sides of the screen are bowed.

T. PIN BALANCE

Adjust the side pin corner balance top when the top sides of the screen are bowed towards left or right.

B. PIN BALANCE

Adjust the side pin corner balance bottom when the bottom sides of the screen are bowed towards left or right.

11

ICON CONTROL FUNCTIONS

COLOR TEMP Choose different preset color temperatures or set your own customized color parameters.

RED GAIN Adjust the red gain.

GREEN GAIN Adjust the green gain.

BLUE GAIN Adjust the blue gain.

RED BIAS Adjust the red bias.

GREEN BIAS

Adjust the green bias.

BLUE BIAS Adjust the blue bias.

LANGUAGE Select language for OSD (5 languages).

DEGAUSS

STATUS

Degaussing keeps the monitor free from unwanted magnetism that can result in color impurity.

Display horizontal & vertical frequency and polarity.

H. MOIRE

V. MOIRE

RECALL

Adjust the horizontal picture moire cancellation.

Adjust the vertical picture moire cancellation.

Reset the screen to the Factory Preset Display Settings.

ROTATION Adjust the rotation when the screen is tilted left or right (Optional).

12

ALIGNMENT PROCEDURE

◆ Standard Adjustment Conditions

1. Power source voltage : AC 120V, 60Hz/AC 220V, 50Hz.

2. Aging : Take at least 20 minutes warm-up time.

3. Signals.

Video : Analog 0.7Vpp 75

Ω terminal positive polarity

Synchronizing : TTL Level Negative/Positive Separate/Composite

Deflection frequency

Horizontal Frequency : 30KHz - 70KHz

Vertical Frequency : 50Hz - 160Hz

◆ Pre-Adjustment

1. High Voltage Adjustment

Adjust 25.8K Vdc between Anode cap and ground at a cross hatch pattern of 60KHz by using VR 601.

2. H.Size Adjustment

(a) Receive a cross hatch pattern of 60KHz

(b) Set the H-Size control to the maximum on OSD menu.

◆ Method to launch the factory mode

Step 1. Push the menu button.

Step 2. Push the menu button and plus control button ( + ) for 5 times in same time.

◆ Main Adjustment

1. Setting the Controls

Set the value of items as following.

Contrast : Max. (OSD value up to 100)

Brightness : Center (Set the OSD value to 50)

2. H.size, V.size, H.phase, V.position, Pincushion, Trapezoid

Receive the cross hatch pattern of Factory preset mode.

H.size, V.size, H.phase, V.position, Pincushion, Trapezoid are adjusted at each mode.

In Factory, Auto Alignment was done at each mode. Therefore, Factory preset mode has it’s own value according to each control.

3. Focus

(a) Set brightness control to center and contrast control to MAX.

(b) Receive all “H” character pattern of 60KHz mode signal.

(c) Adjust the Focus control of FBT to obtain best Focus (static focus and Dynamic focus).

4. Geometric Distortion Adjustment

(a) Receive the cross hatch pattern of VGA mode signal by using the signal generator.

(b) Pin balance, Parallelogram are adjusted the best geometric status.

(c) Repeat the adjustment at each mode.

5. White Balance Adjustment

(a) Receive a full white pattern of 60KHz mode.

(b) Set the bright control and contrast control to the maximum and receive the all black pattern.

(c) Adjust the G1 control in Factory mode to 0.8 Ft/L.

(d) Select the R, G, B Bias on the OSD menu and adjust the +/– key to get the color coordinates in

X=0.281, Y=0.311.

(e) If the screen luminosity is changed, repeat (c) & (d) to get the 0.8 Ft/L screen luminosity.

(f) Set the brightness control to the center and contrast control to the maximum.

(g) Receive a full white pattern.

13

(h) Select the R, G, B gain on the OSD menu and adjust the +/– key to get the color coordinates in

X=0.281±0.02, Y=0.311±0.02.

(i) Adjust the sub contrast (ABL) control to get the screen luminosity to 30.0 Ft/L.

6. Static Convergence Adjustment

(a) Apply a magenta cross hatch pattern on display.

(b) Adjust the focus from the best over all focus on the display.

Also adjust the brightness to the desired condition.

(c) Vertical red and blue lines are converged by varying the angles between the two tabs of the 4-pole magnets.

(d) Horizontal red and blue lines are converged by varying the tabs together keeping the angle between them constant.

(e) Apply a yellow cross hatch pattern on the display.

(f) Vertical green and red lines are converged by varying the angle between the two tabs of the 6-pole magnets.

(g) Horizontal green and red lines are converged by varying the tabs together and keeping the angle between them constant.

14

TROUBLESHOOTING HINTS

1. No Character

No Character

Are the

Contrast &

Brightness Controls maximum

Yes

Is whole screen bright?

Yes

No

No

Change the Contrast &

Brightness control to maximum

No Raster

Refer to

No Raster

Is CRT

Cathode (Rk, Gk, Bk) signal level normal?

No

Is the output signal of the

(pin 21, 24, 26) pre-amp

(IC801, KA2500) normal?

No

Yes

Rk, Gk, Bk

About 45Vpp

Check the peripheral circuit of CRT Board

Yes

Check the video output circuit and IC802 (pin 4, 10, 12) and their ambient circuit

No

Is 12Vdc line normal?

Yes

Is clamping pulse (pin 18 of IC801) normal?

Yes

No

Trouble in 12Vdc line

Check the clamping pulse circuit

No

Is input signal normal?

Yes

Trouble in IC801 and its ambient circuit

Check the signal cable

15

2. No Raster

No Raster

Is CRT heater red-hot?

Yes

Turn the Brightness

& Contrast control to set Maximum

Yes

Is whole screen bright?

Yes

Check

G1 voltage about

-40V?

Yes

Is CRT

G2 (screen) voltage about 500V?

Yes

Is 100Vdc line normal?

Yes

Does

the Brightness control make screen bright?

Yes

Trouble in FBT

No

No

No

No

No

No

Is Heater

Voltage (CRT PWB) about 6V?

Yes

Trouble in

CRT

No

Trouble in power supply circuit

Refer to trouble in power supply unit.


Trouble in G1 line

Trouble in FBT or its pin 4 ambient circuit

Trouble in 100Vdc line of power supply unit

High Voltage trouble in FBT

Refer to trouble in P.S.U

16

3. A Missing Color

One color is missing

0.7Vpp

Is input signal normal?

Yes

Is the output of pre-amp

(IC801, KA2500) pin 21, 24, 26 all normal?

Yes

No

No

Check video signal cable or video card.

Trouble in IC801 or its ambient circuit

CRT

Cathode (Rk, Gk, Bk) is normal?

No

RK, GK, BK

About 40V p-p

Yes

Is video output IC802 waveform normal?

Yes

No

Trouble in video output circuit, IC802 or ambient

Each grid (G1, G2) voltage normal?

Yes

Replace CRT

No

Trouble in 100Vdc line

Trouble in G1,G2 line

17

4. Abnormal OSD Font

Abnormal OSD Font * If menu key selected.

Is menu key selected?

Is OSD Font exist?

Yes

One color is missing

Yes

Is the output of IC803

(pin 12,13, 14) normal?

No Is Heater

Voltage about 6V?

Yes

Troubie in

IC803 or its ambient circuit

No

Trouble in

Heater voltage line.

Refer to trouble in P.S.U

No

Trouble in IC803 and its ambient circuit

Yes

Refer to Missing Color

18

5. Horizontal Output Circuit

11V

0V

10V

0V

66V

Trouble in Horizontal output circuit

(No Raster)

Is the

B+line voltage over 175V?

Yes

No

Trouble in 175V line.

Is the H-out waveform of IC501 normal?

Yes

No

Trouble in IC501

Is the Gate wave form of

Q553 normal?

Yes

No

Trouble in Q551, Q552

Is the Drain waveform of

Q553 normal?

Yes

Trouble in Q554 and its ambient circuit.

No

Trouble in Q553

19

6. Unstable Picture

6-1. Horizontal

Unstable picture

Is H.Sync

input pin of IC501 correct?

Yes

Trouble in IC501

No

Check H.Sync Out of

Micom or its ambient circuits.

20

6-2. Vertical

45Vp-p

Unstable or

Abnormal picture

Is

– 13V DC line correct?

Yes

No

Is the output waveform of IC401

(pin 5) normal?

Yes

Check PWR – 13V ambient circuit.

Check V.DY and ambient circuit.

No

Is the output pulse of IC501 (pin 4) normal?

No

Trouble in V.Sync line or IC501 failure.

Yes

Check the IC401 or ambient circuit.

21

7. Focus

Monitor remains unfocused

Check

Focus VR in

FBT

Is focus acceptable?

No

Trouble in Focus circuit (FBT)

Yes

OK

22

7-1. Dynamic Focus

F

VH

F

VV

ORION : 300V 150V

F

VH

Focus is poor

F

DF waveform

VV

Is the waveform of the

DF pin in FBT correct?

No

Is the cathode voltage of the D705 about 700V?

2V

0V

4.5V

Yes

Is the base voltage of the Q703 about

12V?

Yes

DF waveform

Is the waveform of the pin 8 in IC501 correct?

Yes

0.8V


Yes

No

No

No

* Check after adjusting the static focus

finely by VR in FBT

1. Check the CRT socket

or connector wire

2. Trouble in FBT or CRT

1. Check the waveform of

the pin 4 of FBT.

2. Check D705

1. Check the 12V DC line.

2. Check Q703, Q704

Trouble in IC501 or C523

23

8. Convergence

Poor convergence

Is convergence on the center area bad?

No

Yes

Is convergence on the fringe area bad?

Yes

Adjust static convergence

Adjust D.Y

Location

Refer to

Adjustment procedure of convergence

24

9. Abnormal Picture

9-1. Horizontal Size

Abnormal

H.Size

Is the HV 25.8KV?

No

Adjust the HV VR601

Yes

Check the IC501 and R503, C507

25

9-2. Vertical Size

Abnormal

V.Size

Is changeable the

DC voltage of

IC401 pin 1?

Yes

No

Is the 3.5Vdc of pin

4 of the IC501?

Yes

Check the IC401 and its ambient circuit

No

Trouble V.OSC/

Deflection Circuit

Refer to V.OSC/Deflection circuit

Check the IC501 and its ambient circuit

26

10. High Voltage Output Circuit

Trouble in H.V circuit

(No Raster)

Is

175V line voltage normal?

Yes

Is Q601

Gate waveform normal?

No

Is Q604, Q603

Base waveform normal?

No

Is IC601 pin 10 normal?

Yes

Is the

IC601 pin5 H.trigger

correct?

No

Trouble in H.trigger

No

Yes

Yes

No

Yes


Trouble in Q601 or FBT


12V Line

Trouble in IC601

Trouble in IC601 ambient circuit.

27

11. Side-Pincushion Circuit

Side-Pincusion distortion is excessive or barrel

Select the side-pincushion icon on OSD menu, and adjust acceptable position.

No

Is the pin 5 waveform of IC501 correct

No

Trouble in IC501

Yes

O.K

Yes

Check IC501 or their ambient circuit

(pin 13, 14)

28

12. Power Supply Unit (P.S.U)

Trouble in P.S.U

400Vpp (620Vpp)

Is power switch on?

Yes

Is fuse F001

O.K?

Yes

Is voltage of T001 pin 8 130V

(370V)?

Yes

Is the waveform of Q002

Drain pin correct?

Yes

Is voltage of C104

175Vdc?

Yes

Is voltage of C101

100Vdc?

Yes

Is voltage of C110

7.0Vdc?

A

No

Switch on

No Check the power cord outlet and diode D001, D002,

D003, D004

No Trouble in D001, D002,

D003, D004, C004 and

TH001.

No

Trouble in T001, IC001,

IC101, IC002 and D007 etc.

No

Trouble in D102 or its ambient circuit

No

Trouble in D101 or

Video Part

No

Trouble in D104

29

A

Is voltage of C117 14.3Vdc?

Yes

Is

voltage of C643

-15Vdc?

Yes

Is voltage of C112

25Vdc?

Yes

P.S.U O.K

No

No

No

Trouble in D103 or horizontal Part.

Trouble in D643 or vertical

Part.

Trouble in D105

30

BLOCK DIAGRAM

31

SCHEMATIC DIAGRAM

35

EXPLODED VIEW & MECHANICAL PARTS LIST

36

INFORMATION OF PART DESCRIPTION

Important Safety Notice

Components identified with the International Symbol have special characteristics important for safety.

When replacing any components, use only manufacturer’s specified parts.

Abbreviation of Description

RESISTOR Description

F

J

K

M

G

Allowance

± 1%

± 5%

± 10%

± 20%

± 2%

Example:

Fig &

Index

R101

R102

Part No Description

Resistors

RD-4Z820J

RD-4Z201J

Carbon: 82J

Carbon1/4W-200J

CAPACITOR Description

C

D

F

J

K

P

Z

Allowance

± 0.25pF

± 0.5%

± 1pF

± 5%

± 10%

± 100% ~ 0%

± 80% ~ –

Example:

Fig &

Index

Part No Description

Capacitors

C102 CCXF1H104Z Ceramic 50V 0.1µF Z

C402 CCXB1H331K Ceramic 50V 330PF K

C105 CMXM 2A224J MYLAR 100V 0.22µF J

37

ELECTRICAL PARTS LIST

The components identified by mark ! have special characteristics important for safety and x-ray radiation.

These should be replaced only with the types specified in the parts list.

LOC PART-CODE PART-NAME PART-DESC

B001 5PB13890-COIL BEAD




B005M 5PB14865-COIL BEAD







B2

B3

5PB13890-COIL BEAD

5PB13890-COIL BEAD





BXX1 5PB13890-COIL BEAD

BXX2 5PB13890-COIL BEAD

BI3890

BI3857(AXIAL)

BI3857(AXIAL)

BI3857(AXIAL)

BI-4865(5TS)

BI3890

BI3890

BI3857(AXIAL)

BI3857(AXIAL)

BI3857(AXIAL)

BI3890

BI3890

BI3890

BI3857(AXIAL)

BI3857(AXIAL)

BI3857(AXIAL)

BI3857(AXIAL)

BI3890

BI3890

!

C001 CL1UC3104M C LINE ACROSS WORLD AC250V 0.1UF M R.47

!

C004 CH1FDF472M C CERA AC 2.5KV 4700PF M AC250V

!

C005 CEYP2G221Z C ELECTRO 400V SMH 220MF (25.4*40)

C006 CCXE3D103P C CERA HIKE 2KV 0.01MF P

C007 CEXF1E101V C ELECTRO

C009 CMXL2A334J C MYLAR

C010 CMXM2A332J C MYLAR

C011 CXCH1H101J C CERA


C013 CCXB3A331K C CERA



C016 CCZF1H104Z C CERA

!

C017 CH1FDF472M C CERA AC

C018 CEXF1H109V C ELECTRO

C101 CEXF2C680D C ELECTRO






C112 CEXF1H331C C ELECTRO


C116 CEXF2E220D C ELECTRO



C201 CCXB1H181K C CERA

C202 CEXF1C101V C ELECTRO


25V RSS 100MF (6.3X11) TP

MEU 100V 0.33MF J

100V 3300PF J (TP)

50V CH 100PF J (TAPPING)

100V 1500PF J (TP)

1KV B 330PF K (TAPPING)

100V 6800PF J (TP)

100V 1000PF J (TP)

50V HIKF 0.1MF Z

2.5KV 4700PF M AC250V

50V RSS 1MF (5X11) TP

160V RMU 68MF(12.5*25)


250V RSS 100MF 16X31.5

25V RSS 100MF (6.3X11) TP

16V RMU 1000MF(10*16) TP

25V RSS 220MF (8X11.5) TP

50V RUS 330MF(10*20) TP

50V HIKF 0.1MF Z

250V RMU 22MF (10*20)

25V RMU 1000MF (10*20)

160V RMU 33MF(10*20)

50V B 180PF K (TAPPING)

16V RSS 100MF (6.3X11) TP




C205 CCXF1H103Z C CERA

C207 CCZB1H181K C CERA







C302 CCXF3A223Z C CERA















C507 CMXD2A102GC MYLAR














C523 CEXD1H100F C ELECTRO






C535 CMXF2G154J C MYLAR

C536 CMXF2D184J C MYLAR




50V F 0.01MF Z (TAPPING)

50V B 180PF K AXIAL

50V HIKF 0.1MF Z



50V B 180PF K AXIAL

50V B 180PF K AXIAL


HIKF 1KV 0.022MF Z

100V 5600PF J (TP)

100V 1000PF J (TP)

RSS 250V 0.47MF 6.3X11

100V 0.039MF J (TP)

MEU 100V 0.47MF J

16V RSS 470MF (10X12.5)TP

100V MEU 0.22MF J

50V RSS 100MF (8X11.5) TP

100V MEU 0.22MF J

50V HIKF 0.1MF Z

100V MEU 0.033MF J (TP)


100V 0.033MF J (TP)

50V HIKF 0.1MF Z

KD 100V 1000PF G

16V RSS 100MF (6.3X11) TP






50V RSS 2.2MF (5X11) TP

16V RSS 470MF (10X12.5)TP

50V B 180PF K AXIAL

50V B 180PF K AXIAL

50V HIKF 0.1MF Z


1KV B 470PF K (T)

50V RND 10MF (8X11.5) TP

50V HIKF 0.1MF Z


100V 0.1MF J (TP)



MPP 400V 0.15MF J

MPP 200V 0.18MF J (TP)

200V MPP 0.36MF J (TP)


38

LOC






C553 CMXL2E104J C MYLAR


C556 CMXH3C272J C MYLAR












C609 CEXD1H109F C ELECTRO




C613 CMXM2A562G C MYLAR



C618 CMXL2E223J C MYLAR





C641 CEXF2A100V C ELECTRO

C642 CEXF2D220V C ELECTRO



















PART-CODE PART-NAME PART-DESC LOC


MPP 400V 0.15MF J

MPP 400V 0.1MF J

50V RSS 100MF (8X11.5) TP

100V 0.1MF J (TP)

MEU 250V 0.1MF J

MEU 100V 0.15MF J

BUP 1.6KV 2700PF J (TP)

BUP 1.6KV 2700PF J (TP)


HIKB 1KV 2200PF K

100V 0.01MF J (TP)

MEU 100V 0.33MF J


100V MEU 0.22MF J


















BUP 1.6KV 600PF J

100V 0.047MF J (TP)

16V RSS 100MF (6.3X11) TP

50V RND 1MF (5X11) TP

16V RSS 100MF (6.3X11) TP

50V HIKF 0.1MF Z


100V 5600PF G (TP)

50V B 820PF K

250V RSS 22MF (13X20) TP

MEU 250V 0.022MF J(TP)

250V RMU 22MF (10*20)

HIKF 1KV 0.022MF Z

25V RMU 1000MF (10*20)

50V F 0.1MF Z

100V RSS 10MF (6.3X11) TP

200V RSS 22MF (10X20)

16V RSS 1000MF (10X20) TP



CA801 9970780032 CONN AS

!

CT301 9979300008 SOCKET CRT

!

CT302 9979617037 CDT

CT303 9970710241 CRT GND AS

CW301 9979220009 CONN WAFER

CW801 485923272S CONN WAFER

CW802 485923282S CONN WAFER

CXX1 CCXF1H104Z C CERA

!

D001 DRL205---DIODE

!

D002 DRL205---DIODE

!

D003 DRL205---DIODE

!

D004 DRL205---DIODE

D005 DER206---DIODE

D006 DRU1P----DIODE

D007 DZN4148--DIODE

D008 DZN4148--DIODE

50V RSS 3.3MF (5X11) TP



50V F 0.01MF Z



RSS 16V 22MF 5*11

50V HIKF 0.1MF Z

50V HIKF 0.1MF Z

HIKF 1KV 0.022MF Z

50V HIKF 0.1MF Z



50V HIKF 0.1MF Z

50V HIKF 0.1MF Z



D101 DRU1P----DIODE

D102 DRG4C----DIODE

D103 DER206---DIODE

D104 DER206---DIODE

D105 DER206---DIODE

D201 DZN4148--DIODE

D202 DZN4148--DIODE

D231 DZN4148--DIODE

D232 DZN4148--DIODE

D401 DZN4148--DIODE

D402 D1N4002A-DIODE

D550 DTVR1G---DIODE

D551 DZN4148--DIODE

D553 DRK36----DIODE

D554 DDTV32F--DIODE

D601 DZN4148--DIODE

D602 DRU3C----DIODE

PART-CODE PART-NAME PART-DESC

1N4148 AUTO 52MM

1N4148 AUTO 52MM

RU 1P (TAPPING)

RG4C LF-L1

ER206

ER206

ER206

1N4148 AUTO 52MM

1N4148 AUTO 52MM

1N4148 AUTO 52MM

1N4148 AUTO 52MM

1N4148 AUTO 52MM

1N4002

TVR1G TPA1

1N4148 AUTO 52MM

RK36

DTV32F

1N4148 AUTO 52MM

RU 3C

50V HIKF 0.1MF Z


50V HIKF 0.1MF Z


50V HIKF 0.1MF Z


50V F 0.1MF Z

50V F 0.1MF Z

50V F 0.1MF Z

50V F 0.1MF Z

50V HIKF 0.1MF Z

50V HIKF 0.1MF Z

50V HIKF 0.1MF Z


50V HIKF 0.1MF Z

50V B 270PF K

50V B 390PF K

HIKF 500V 0.01MF Z

SMH250+51088+20379#28=250

033 0 7700 44

M41KXU100XX021 (5X10(5))

0.12*5*24+BL101NG*2=660

SMW250-08

5267-06A STICK TYPE

5267-07A STICK TYPE

50V F 0.1MF Z

RL205

RL205

RL205

RL205

ER206

RU 1P (TAPPING)

39

LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC

D603 DZN4148--DIODE

D605 DER206---DIODE

D607 DZN4148--DIODE

D608 DRU3C----DIODE

D641 D1A5G----DIODE

D642 D1N4007--DIODE

D643 DER206---DIODE

D701 DZN4148--DIODE

D702 DZN4148--DIODE

D703 DZN4148--DIODE

D704 DZN4148--DIODE

D705 DRU1P----DIODE

D802 DZN4148--DIODE

D804 DZN4148--DIODE

D806 DZN4148--DIODE

D831 DZN4148--DIODE

1N4148 AUTO 52MM

ER206

1N4148 AUTO 52MM

RU 3C

1A5G

IN4007

ER206

1N4148 AUTO 52MM

1N4148 AUTO 52MM

1N4148 AUTO 52MM

1N4148 AUTO 52MM

RU 1P (TAPPING)

1N4148 AUTO 52MM

1N4148 AUTO 52MM

1N4148 AUTO 52MM

1N4148 AUTO 52MM

D832 DZN4148--DIODE 1N4148 AUTO 52MM

D833 DZN4148--DIODE 1N4148 AUTO 52MM

!

DG001 5MG0000062 COIL DEGAUSSING DG-710B

DZ001 DGDZJ18C-DIODE ZENER GDZJ 18C

DZ002 DGDZJ18C--

DZ231 DDZ5R1B---

DZ232 DDZ5R1B---

DZ233 DDZ5R1B---

DZ234 DDZ5R1B---

DZ235 DDZ5R1B---

DZ501 DDZ5R1B---

DZ601 DDZ5R1B---

DZ602 DGDZJ18C--

DZ603 DDZ5R1B---

DZ604 DZ200A----

DZ605 DZ300A----

DIODE ZENER

DIODE ZENER

DIODE ZENER

DIODE ZENER

DIODE ZENER

DIODE ZENER

DIODE ZENER

DIODE ZENER

DIODE ZENER

DIODE ZENER

DIODE

DIODE

DZ701 DDZ7R5BM-- DIODE ZENER

DZ702 DDZ15BM--- DIODE ZENER

!

F001 5F3CB3122L FUSE CERA

F001A 4857415001 CLIP FUSE

GDZJ 18C

DZ-5.1B

DZ-5.1B

DZ-5.1B

DZ-5.1B

DZ-5.1B

DZ-5.1B

DZ-5.1B

GDZJ 18C

DZ-5.1B

Z200A

Z300A

DZ7.5BM

DZ15BM

SEMKO TL 3.15AH 250V MF51

PFC5000-0702

F001B 4857415001 CLIP FUSE PFC5000-0702

I102A 1KA78R12-IC REGULATOR KA78R12

I401A 1TDA9302H- IC VERTICAL TDA9302H

I802A 1TDA9532-IC VIDEO OUTPUT TDA9532

IC001 1KA3842B-IC POWER KA3842B

IC101 1KA78L05AZ IC REGULATOR KA78L05AZ

IC201 1KS88P6232 IC MICOM

IC202 124C08---IC EEPROM

KS88P6232N

24C08

IC203 1KA7542--IC VOTAGE DETECTOR KA7542

IC501 1UPC1888CT IC H/V OSC UPC1888CT

IC601 1KA7500B-IC

IC801 1KA2500--IC

KA7500B

KA2500

IC803 1DW0SD10-- IC OSD

JXX2 9970710238 CONN AS

KS2508-02

1007#24+SOLDER=80

L501 5CPZ680K03 COIL PEAKING 68UH K (AXIAL 7MM)

L531 5MH0000075 COIL H-LINEARITY TRL-715B

L801 5CPZ101K02 COIL PEAKING 100UH K (AXIAL 3.5MM)


L803 5CPZ338K02 COIL PEAKING 0.33UH K (AXIAL 3.5MM)





LED01 DSD50GYW-- LED

!

P001 9979500023 RECEPTACLE

P804A 9970710226 CONN AS

PCB1 9979800515 PCB MAIN

!

PR001 DECPAC140M POSISTOR

!

Q001A T2SK2101-FET

Q002 TZTC3198YTR

Q101 TZTC3206YTR

SD50GYW(GREEN/AMBER)

BNS-02AB2L-3

35068+1015#18+BL101NG=250

T=1.6*246*330

ECPAC140M290

2SK2101

KTC3198Y-(1815Y) (AUTO)

KTC3206Y (2229Y)

Q103 TKTA1273Y- TR

Q104 TZTC3198YTR

Q105 TKSB546Y-TR

Q231 TZTC3198YTR

Q232 TZTC3198YTR

Q233 TZTC3198YTR

Q401 TZTC3198YTR

Q501 TZTC3202YTR

Q502 TZTA1270Y- TR

Q506 T2N3904--TR

Q507 TZTC3198YTR

Q531 TKSC2383Y- TR

Q532 T1RF630A-FET

Q533 TZTC3198YTR

Q534 T2SK2522-FET

Q535 TZTC3198YTR

Q536 T2SK2522-FET

Q537 TZTC3198YTR

Q540 TZTC3198YTR

Q551 TZTC3202YTR

Q552 TZTA1270Y- TR

Q553 T1RF630A-FET

Q554A T2SC5387-TR H.OUT

Q554D 9970710234 CONN AS

Q601 T2SK2101-FET

Q602 TZTC3207-TR

Q603 TZTA1270Y- TR

Q604 TZTC3202YTR

Q605A T2SJ449--TR

Q642 TZTA1270Y- TR

Q643 TZTA1024Y- TR

Q651 TZTC3198YTR

Q701 T2N3904--TR

Q702 T2N3904--TR

Q703 TKSC5042FTR

KTA1273-Y

KTC3198Y-(1815Y) (AUTO)

KSB546-Y

KTC3198Y-(1815Y) (AUTO)

KTC3198Y-(1815Y) (AUTO)

KTC3198Y-(1815Y) (AUTO)

KTC3198Y-(1815Y) (AUTO)

KTC3202Y (AUTO)(1959Y)

KTA1270Y(AUTO)(562Y)

2N3904

KTC3198Y-(1815Y) (AUTO)

KSC 2383-Y

IRF630A

KTC3198Y-(1815Y) (AUTO)

2SK2522-01MR

KTC3198Y-(1815Y) (AUTO)

2SK2522-01MR

KTC3198Y-(1815Y) (AUTO)

KTC3198Y-(1815Y) (AUTO)



IRF630A

2SC5387

0.12*6*16+35068+35750=170

2SK2101

KTC3207 (AUTO)



2SJ449


KTA1024Y (949Y)

KTC3198Y-(1815Y) (AUTO)

2N3904

2N3904

KSC5042F

40


Q704 TKSC5042FTR KSC5042F

!

R001 RC-2Z105JR CARBON COMP 1/2 1M OHM J SR37

R002 RS01Z333JR M-OXIDE FILM 1W 33K OHM J (TAPPING)






R008 RD-AZ102JR CARBON FILM 1/6 1K OHM J


R010 RD-AZ472JR CARBON FILM 1/6 4.7K OHM J



R013 RN-AZ1502F R METAL FILM 1/6 15K OHM F


R015 RD-AZ391JR CARBON FILM 1/6 390 OHM J


R017 RW01Z278JN R WIRE WOUND 1W 0.27 OHM J NON-INDUCT



R020 RD-4Z560JR CARBON FILM 1/4 56 OHM J

R101 RS01Z100JR M-OXIDE FILM 1W 10 OHM J (TAPPING)









R116 RS01Z129JR M-OXIDE FILM 1W 1.2 OHM J (TAPPING)





























R301 RD-4Z102JR CARBON FILM 1/4 1K OHM J




R305 RD-4Z472JR CARBON FILM 1/4 4.7K OHM J

R401 RN-AZ9091F R METAL FILM 1/6 9.09K OHM F







R408 RD-4Z159JR CARBON FILM 1/4 1.5 OHM J
































41



































R611 RW01Z188JN R WIRE WOUND 1W 0.18 OHM J NON-INDUCT






R617 RD-2Z229JR CARBON FILM 1/2 2.2 OHM J










R630 RN-4Z4701F R METAL FILM 1/4 4.70K OHM F

























R670 RX10V829JR CEMENT 10W 8.2 OHM J VERTICAL








R706 RS02Z184JR M-OXIDE FILM 2W 180K OHM J





















42















R829 RD-AZ106JR CARBON FILM 1/6 10M OHM J

R830 RD-AZ106JR CARBON FILM 1/6 10M OHM J

R831 RF-4Z101JR FUSIBLE 1/4 100 OHM J

R833 RF-4Z101JR FUSIBLE




1/4 100 OHM J

1/4 100 OHM J

1/4 91 OHM J

1/4 91 OHM J





!

RL001 5SC0101006 SW RELAY KI-S-112M 1C-1P(HR-CR313)

SC 9970800038 CABLE SIGNAL AS 15P+1C/DDC=1.5M(GY-286A)

SC001 9970710201 CONN AS BL101NG+35740-9002=350

SG301 4SG0D00104 SPARK GAP


S-23 1.5KV

S-23 1.5KV


SW001 5S50101Z01 SW TACT



S-23 1.5KV

KPT-1115VM 1C-1P

KPT-1115VM 1C-1P

KPT-1115VM 1C-1P



!

T001 5RM0000102 TRANS SMPS

!

T002 5RY0000004 TRANS SYNC

KPT-1115VM 1C-1P

KPT-1115VM 1C-1P

DWT-715B

DST-710C

T501 5RD0000050 TRANS DRIVE

!

T601 5RH0000124 FBT

T602 5R50000037 TRANS BUCK

!

TH001 DTP8D13--THERMISTOR

VR001 RV6421502P R SEMI FIXED

VR601 RV6421503P R SEMI FIXED

DDT-715B

FFA79013U

DT-715B

TP8D13

CCT 065AT 5K OHM B TAP

CCT 065AT 50K OHM B TAP

VR602 RV6421503P R SEMI FIXED CCT 065AT 50K OHM B TAP

X201 5XE12R000E CRYSTAL QUARTZ HC-49/U 12.00000MHZ 30PPM

43

DAEWOO ELECTRONICS CO., LTD

686, AHYEON-DONG MAPO-GU

SEOUL, KOREA

C.P.O. BOX 8003 SEOUL, KOREA

TELEX : DWELEC K28177-8

CABLE : "DAEWOOELEC"

E-mail : [email protected]

PRINTED DATE : APRIL, 2000

Daewoo 715B Service manual

Service Manual

XGA COLOR MONITOR

Model : 715B

DAEWOO ELECTRONICS CO., LTD.

http : //svc.dwe.co.kr

CONTENTS

AFETY PRECAUTIONS

◆ Safety Check

◆ Fire & Shock Hazard

◆ Implosion Protection

◆ X-Ray

GENERAL SAFETY INFORMATION

◆ Terms in the manual

◆ Terms as marked on equipment

◆ Symbols in the manual

◆ Symbols as marked on equipment

◆ High Voltage Warning

SERVICING PRECAUTIONS

◆ General Servicing Precautions

◆ Electrostatically Sensitive (ES) Devices

◆ General Soldering Guidelines

◆ IC Removal/Replacement

◆ Removal

◆ Replacement

◆ “Small-Signal” Discrete Transistor Removal/Replacement

◆ Power IC, Transistor or Devices Removal/Replacement

◆ Diode Removal/Replacement

TECHNICAL INFORMATION

GENERAL INFORMATION

◆ Abbreviations

PIN CONNECTOR

CAUTIONS FOR ADJUSTMENT AND REPAIR

◆ Caution For Servicing

OPERATION AND ADJUSTMENT

Control Panel

Key Process

•

OSD Functions

ALIGNMENT PROCEDURE

◆ Standard Adjustment Conditions

◆ Pre-Adjustment

◆ Method to launch the factory mode

◆ Main Adjustment

TROUBLESHOOTING HINTS

1. No Character

2. No Raster

3. A Missing Color

4. Abnormal OSD Font

5. Horizontal Output Circuit

6. Unstable Picture

6-1. Horizontal

6-2. Vertical

7. Focus

7-1. Dynamic Focus

8. Convergence

9. Abnormal Picture

9-1. Horizontal Size

9-2. Vertical Size

10. High Voltage Output Circuit

11. Side-Pincushion Circuit

12. Power Supply Unit (P.S.U)

BLOCK DIAGRAM

SCHEMATIC DIAGRAM

EXPLODED VIEW & MECHANICAL PARTS LIST

INFORMATION OF PART DESCRIPTION

Important Safety Notice

Abbreviation of Description

ELECTRICAL PARTS LIST

DAEWOO ELECTRONICS CO., LTD

686, AHYEON-DONG MAPO-GU

SEOUL, KOREA

C.P.O. BOX 8003 SEOUL, KOREA

TELEX : DWELEC K28177-8

CABLE : "DAEWOOELEC"

E-mail : [email protected]

PRINTED DATE : APRIL, 2000

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