LG DVD-3230-N Service manual

• Top View..................................................4-1

• Top View(without Tray Disc).................4-1

• Bottom View ...........................................4-1

1. Holder Clamp ....................................4-2

1-1. Clamp Assembly Disc.......................4-2

1-1-1. Plate Clamp..................................4-2

1-1-2. Magnet Clamp ..............................4-2

1-1-3. Clamp Upper.................................4-2

2. Tray Disc...........................................4-2

3. Base Assembly Sled........................4-3

3-1. Gear Assembly Feed........................4-3

3-2. Gear Assembly Middle......................4-3

3-3. Gear Assembly Rack........................4-3

4. Rubber Rear ......................................4-3

5. Frame Assembly Up/Down..............4-4

6. Belt Loading......................................4-4

7. Gear Pulley .......................................4-4

8. Gear Loading....................................4-4

9. Guide Up/Down.................................4-4

10. PWB Assembly Loading................4-4

11. Base Main........................................4-4

1. Tools and Fixtures for SVC.............4-5

2. Install Process..................................4-5

3. Adjustment Process.........................4-6

1. Deck Mechanism Exploded View....4-7

CONTENTS

SECTION 4 MECHANISM

DECK MECHANISM PARTS LOCATIONS

EXPLODED VIEW

DECK MECHANISM ADJUSTMENT

DECK MECHANISM DISASSEMBLY

4-1

DECK MECHANISM PARTS LOCATION

Starting No.

1, 2 1, 2, 3 1, 2, 3, 4 1 1, 6

1, 2, 6

1, 2, 6, 8

1, 2, 6, 8, 9 1, 2, 7 1, 2, 7

1, 2 1, 2 ,13 1, 2, 13, 14 1, 2, 7, 12, 13, 14 1, 2, 13

1, 2, 7, 12, 13, 14, 15, 16, 17

3 4 5 6 7

11 12

13 14 15 16 17

Holder Clamp Clamp Assembly Disc Plate Clamp Magnet Clamp Clamp Upper Tray Disc Base Assembly Sled

Gear Assembly Feed Gear Middle Gear Assembly Rack Rubber Rear Frame Assembly Up/Down Belt Loading Gear Pulley Gear Loading Guide Up/Down PWB Assembly Loading

Base Main

2 Screws, 2 Locking Tabs

4 Screws, 1 Connector

1 Locking Tabs

1 Screw

1 Locking Tab

1 Locking Tab 1 Hook 2Screw 2 Locking Tabs

4-1

4-1 4-1 4-1 4-2 4-3

4-3

4-3 4-4

4-4 4-4 4-4 4-4 4-4

4-4

Bottom

Procedure

Parts Fixing Type

Figure

Disass embly

Note

When reassembling, perform the procedure in reverse order.

The “Bottom” on Disassembly column of above Table indicates the part should be disassembled at the Bottom side.

• Top View (Without Tray)

• Bottom View

• Top View (With Tray)

4-2

DECK MECHANISM DISASSEMBLY

1.Holder Clamp (Fig. 4-1)

1) Release 2 Screws(S1).

2) Unhook 2 Locking Tabs(L1).

3) Lift up the Holder Clamp and then separate it from the Base Main.

1-1. Clamp Assembly Disc

1) Place the Clamp Assembly Disc as Fig. (A)

2) Lift up the Clamp Assembly Disc in direction of arrow(A).

3) Separate the Clamp Assembly Disc from the Holder Clamp.

1-1-1. Plate Clamp

1) Turn the Plate Clamp to counterclockwise direction and then lift up the Plate Clamp.

1-1-2. Magnet Clamp 1-1-3.Clamp Upper

2. Tray Disc (Fig. 4-2)

1) Insert and push a Driver in the emergency eject hole(A) at the right side, or put the Driver on the Lever(B) of the Gear Emergency and pull the Lever(B) in direction of arrow so that the Tray Disc is ejected about 15~20mm.

2) Pull the Tray Disc until it is separated from the Base Main completely.

BASE MAIN

HOLDER CLAMP

CLAMP ASSEMBLY DISC

HOLDER CLAMP

PLATE CLAMP

(S1)

(A)

(L1)

(Fig. A)

MAGNET CLAMP CLAMP UPPER

(B)

LEVER

BOTTOM SIDE VIEW

EMERGENCY EJECT HOLE

(A)

TRAY DISC

BASE MAIN

Fig. 4-1 Fig. 4-2

4-3

DECK MECHANISM DISASSEMBLY

(L2)

(S2)

(C1)

(S2)

(S3)

GEAR ASSEMBLY RACK

PICK UP ASSEMBLY GENERAL

GEAR MIDDLE

GEAR ASSEMBLY FEED

BASE PU(OUTSERT)

RUBBER REAR

GEAR ASSEMBLY FEED

GEAR MIDDLE

GAER ASSEMBLY RACK

MOTOR ASSEMBLY SPINDLE

PICK UP ASSEMBLY GENERAL

MOTOR ASSEMBLY

SPINDLE

3.Base Assembly Sled (Fig. 4-3)

1) Release 4 Screw(S2).

2) Disconnect the FFC Connector(C1)

3-1. Gear Assembly Feed

1) Unhook the Locking Tab(L2) in direction of arrow.

3-2. Gear Middle 3-3. Gear Assembly Rack

1) Release the Scerw(S3)

4. Rubber Rear (Fig. 4-3)

Fig. 4-3

4-4

DECK MECHANISM DISASSEMBLY

(B)

(S5)

(L6)

(L4)

(L5)

(A)

(L3)

(A)

(L6)

(H1)

(C2)

(L6)

FIG. (B)

GUIDE UP/DOWN

BASE MAIN

PWB ASSEMBLY LOADING

GEAR LOADING

BELT LOADING

FRAME ASSEMBLY UP/DOWN

GUIDE UP/DOWN

(A)

(B)

(S4)

FIG. (C)

FIG. (A)

(B)

(C)

GEAR PULLEY

Fig. 4-4

5. Frame Assembly Up/Down

Put the Base Main face down(Bottom Side)

1) Release the Screw(S4)

2) Unlock the Locking Tab(L3) in direction of arrow and then lift up the Frame Assembly Up/Down to separate it from the Base Main.

• When reassembling move the Guide Up/Down in direction of arrow(C) until it is positioned as Fig.(C).

• When reassembling insert (A) portion of the Frame Assembly Up/Down in the (B) portion of the Guide Up/Down as Fig.(B)

6. Belt Loading(Fig. 4-4)

Put the Base Assembly Main on original position(Top Side)

7. Gear pulley (Fig. 4-4)

1) Unlock the Locking Tab(L4) in direction of arrow(B) and

then separate the Gear Pulley from the Base Main.

8. Gear Loading (Fig. 4-4)

9. Guide Up/Down (Fig. 4-4)

1) Move the Guide Up/Down in direction of arrow(A) as Fig.(A)

2) Push the Locking Tab(L5) down and then lift up the Guide Up/Down to separate it from the Base Main.

When reassembling place the Guide Up/Down as Fig.(C) and move it in direction arrow(B) until it is locked by the Locking Tab(L5). And confirm the Guide Up/Down as Fig.(A)

10. PWB Assembly Loading

Put the Base Main face down(Bottom Side)

1) Release 2 Screws(S5)

2) Unkool the Loading Motor Connector (C2) from the Hook (H1) on the Base Main.

3) Unlock 2 Locking Tabs(L6) and separate the PWB Assembly Loading from the Base Main.

11. Base Main(Fig. 4-4)

Note

4-5

DECK MECHANISM ADJUSTMENT

1. Tools and Fixtures for SVC

• For SVC Program Down-Load

• For T-Skew and R-Skew Adjustment

2. Install Process

1. Connect Fig. 1, 2, 3 as Fig. 7.

2. Plug out the Power cord of DVD set.

3. Connect FFC Cable(Fig.2) to the Connector on DVD Set(Fig.8)

4. Connect Printer Cable(Fig.1) to the P.C.Printer Port (LPT1).

5. Plug in the DVD Power cord.

6. Press the Menu key on Remocon.

7. Confirm No.1 LED(RED Color) of Jig board is ON. (Fig.9)

8. Perform The S/W for Down-load at P.C.

9. Open the Program File for Adjusting(Fig.10)

10. Click the Down-load Icon and perform Program Down-load.

11. Displayed remaining time.

12. Confirm LED No.1(RED) and No.2(GREEN) is ON.

13. Plug out the DVD Set Power cord.

14. Disconnect the FFC Cable.

Fig.1. Printer Cable Fig.2. FFC Cable (15 pin) Fig.3. Jig Board

Fig.4. Deviation Disc (0.8mm)

Fig.5. L-Wrench(3mm) Fig.6. RCA Jack Fig.7. Connecting Method

RED

GREEN

RED

Rom Size

File Help

16MBit 6M Bit

LPT1

Manual

953826Bytes

md _bas_ntsc.bin

LPT2

Port

FILE NAME

OPEN

DOWN LOAD

Fig.8. FFC Cable Connecting

Fig.9. Jig Board LED ConditionFig.10. Adjusting Program File Open

MEMO

4-6

DECK MECHANISM ADJUSTMENT

3. Adjustment Procedure

1. Insert Disc(Only Open/Close Key Pressing)

2. Wait Until the Sector Display is about 200,000 (Fig.11)

3. Adjust R-Skew adjusting Point until the Error rate has Minimum rate with L-wrench (3mm).

4. Adjust T-Skew Adjusting Point until the Error rate has Minimum rate.

5. Repeat No. 3, 4 adjusting procedure until the Error rate have Minimum rate.

6. Error rate; SVC-3561 Disc=below 30 and TDV-533 Disc=below 100. If not, Please confirm Play ability on screen.

# You can watch the screen when pressing the Stop key

after the Adjusting is finished, Then perform Play and Scan/Skip operation at Chapter1 and Chapter16 and confirm screen condition, normal or abnormal.

• Please obtain these software for Adjusting through our

Global Cyber Service Center(GCSC).

• The location is http://biz.lgservice.com

& Web Site for End users & Software updates & Product : DVD Player & Search.

R-SKEW ADJUSTING HOLE

T-SKEW ADJUSTING HOLE

Fig.12. Adjusting Method

Fig.11. Adjusting Screen Display

0045

SECTOR : 200145

0065

CURRENT PICK UP POSITION

ERROR RATE SIZE

ERROR RATE (HEXADEAMAL)

AVERAGE ERROR RATE

4-7 4-8

EXPLODED VIEWS

1. Deck Mechanism Exploded View

002

001

003

004

429

026

018

008

009

016

012

430

432

020

430

011

017

014

013

015

431

A01

A02

A03

1-3

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILLNOT ONLY VOID THE W ARRANTY, BUT MAYLEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTYDAMAGE OR USER INJURY.

SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER.

WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. LINE SHOCK.

SAFETY CHECKS

AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED. A CHECK SHOULD BE MADE OF THE FOLLOWING.

SUBJECT : FIRE & SHOCK HAZARD

1. BE SURE THATALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP.

2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.

3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALLLOOSE FOREIGN PARTICLES.

4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS, FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD), AND REPLACE IF NECESSARY. FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.

5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUDING METALSURFACES MUST BE AVOIDED.

6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNATERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.

SUBJECT: GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

SUBJECT : X-RADIATION

1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIRABLE LEVELS.

2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS AN X-RAY SHIELD IN COLOR SETS, ALWAYS RE-INSTALLTHEM.

3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRATION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE ATYOUR DISTRIBUTOR.

4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING CORRECTLY. WE SUGGEST THAT YOU AND YOUR SERVICE ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGULATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCEDURE AND THAT THE HIGH VOLTAGE READING BE RECORDED ON EACH CUSTOMER’S INVOICE.

5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IT IS NECESSARYTO LOCATE THE CAUSE OF EXCESSIVE VOLTAGE.

6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE USED).

SUBJECT: IMPLOSION

1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTEGRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.

2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.

SUBJECT : TIPS ON PROPER INSTALLATION

1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE, OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.

2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS AFACTOR, ETC.

3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION.

4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL MOUNTING KIT, MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS. A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM. BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS.

5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED.

6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYING TO ROLLA CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS.

7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.’S OF THE SAME OR LARGER SCREEN SIZE.

8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS. EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM ASINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

A.C. VOLTMETER

GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC

PLACE THIS PROBE ON EACH EXPOSED METALPART

1-4

SERVICING PRECAUTIONS

CAUTION : Before servicing the DVD covered by this service data and its supplements and ADDENDUMS, read and follow the

SAFETY PRECAUTIONS. NOTE

: if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publications, always follow the safety precautions.

Remember Safety First:

General Servicing Precautions

1. Always unplug the DVD AC power cord from the AC

power source before: (1)Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2)Disconnection or reconnecting any internal electrical

plug or other electrical connection.

(3)Connecting a test substitute in parallel with an elec-

trolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Do not spray chemicals on or near this DVD or any of

its assemblies.

3. Unless specified otherwise in this service data, clean

electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required.

4. Do not defeat any plug/socket B+ voltage interlocks with

whitch instruments covered by this service manual might be equipped.

5. Do not apply AC power to this DVD and/or any of its

electrical assemblies unless all solid-state device heat sinks are cerrectly installed.

6. Always connect test instrument ground lead to the

appropriate ground before connection the test instrument positive lead. Always remove the test instrument ground lead last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1 : Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and 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, drain off any electrostatic charge on your body by touching a 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 test.

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

3. Use only a GROUNDED-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices.

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

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

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

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)

2-2

DISASSEMBLY

CAUTION BEFORE STARTING SERVICING

Electronic parts are susceptible to static electricity and may easily damaged, so do not forget to take a proper grounding treatment as required. Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a magnetized screw driver in servicing. Several kinds of screws are used and some of them need special cautions. That is, take care of the tapping screws securing molded patrs and fine pitch screws used to secure metal parts. If they are used improperly , the screw holes will be easily damaged and the parts can not be fixed.

Top Case

(A)

Tray Door

Disc Tray

Front Panel

Stopper

(B)

CABINET DISASSEMBLY

1. Top Case

1. Release 7 screws (A). (See Fig. 2-1)

2. Lift the top case with holding the back of it, and remove it in the direction of the arrow

Fig. 2-1

Fig. 2-2

Fig. 2-3

3. Front Panel

1. Eject the disc tray. (See Fig. 2-2)

2. Remove the tray door. (See Fig. 2-2)

3. Release 2 screws (B).

4. Pull the front panel toward you while pressing 7 stoppers to disengage, and remove the front panel. (See Fig. 2-3)

2.Tray Door

1.Eject the disc tray.

2. Lift up the tray door in the direction of the arrow.

2-3

Main Circuit Board

(C)

Power Code

Interface Board

(D)

Key Circuit Board

(E)

Fig. 2-4

Fig. 2-5

1. Disassembling of Main Circuit Board and Interface Board

1. Remove the top case.(See Fig. 2-1)

2. Remove 12 screw (C).

3. Remove the deck from Main Circuit Board.

4. Remove Main Circuit Board from Interface Board.

5. Remove 2 screw (D).

6. Remove Interface Board from the chassis.

CIRCUIT BOARD DISASSEMBLY

Note: Before removing the main circuit board, be sure to shortcircuit the laserdiode output land.

After replacing the main circuit board, open the land after inserting the flexible connector. (Refer to Mechanism Disassembly)

2. Digitron and Key Circuit Board

1. Remove the front panel.(See Fig. 2-3)

2. Release 4 screws (E), and remove the digitron circuit board.

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