LG DV286, Service Manual

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PRODUCT SAFETY SERVICING GUIDELINES FOR
DVD
PRODUCTS
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER
PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER’S
APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE
WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING
PROPERTY DAMAGE 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 CORRCTED. A CHECK
SHOULD BE MADE OF THE FOLLOWING.
SUBJECT : FIRE & SHOCK HAZARD
1.BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH AWAY 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 ALL LOOSE 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 PROTRUNING METAL
SURFACES 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, ANTENNA TERMINALS. 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 X-RAY SHIELD IN COLOR SETS,
ALWAYS RE-INSTALL THEM.
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 AT YOUR 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 ASTANDARD SERVICING PROCEDURE. AND THAT THE
HIGH VOLTAGE READING BE RECORDER 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 IS NECESSARY TO
LOCATE THE CAUSE OF EXCES SIVE 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 INTE GRAL
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 A FACTOR, ETC.
3.AVOID PALCEMENT 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
ROLL A 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 A SINGLE OUTLET CAN
LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.