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1 - 4 PRPDUCT SAFETY SERVICING GUIDELINES F
OR VIDEO PRODUCTS
CAUTION: DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN
ANYWAY. NEVER PERFORM CUSTOMINIZED INSTALLATIONS
WITHOUT MANUFACTURER S APPROVAL. UNAUTHORIZED
MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY
LEAD TO YOUR BEING LIABLE FOR ANY RE SULTING PROPERTY
DAMAGE OR USER INURY.
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE
THOROUGHLY FAMILIAR WITH ALL OF THE FOLOWING SAFETY
CHECKS AND SERVICING GUIDELINS. 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 POS ITIONED IN SUCH A
WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONET 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, C OVERS, SHIELDS, STRAIN
RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE
BEEN REINSTALLED PERORIGINAL DESIGN. BE SURE THAT THE
SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN
DEFEATED.
3. SOLDERING MUST BE INSPECTED TO DISVCOVER 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
DETERRIORATION TO PARTS AND COMPONENTS. FOR FRAYED
LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD).AND
REPLACE IF NE CESSARY 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
AROUD PROTRUNING METAL SURFACES MUST BE AVOIDED.
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPRO OF
RESISTORS, CAPAICTORS, ETC. MUST BE REPLACED WITH EXACT
FACTORY TYPES. DO NOT USE REPLACEMENT COMPONETS
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 ADN SCREWS) TO BE SURE THE SET IS SAFET TO
OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE
A LINE ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C.
VOLTMETER, HAV ING 5000 OHMS PER VOLT OR MORE SENSITIVITY,
IN THE FOLLOWING MANNER; CONNECT A 1500OHM 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 EXPPOSED METALLIC PARTS, ONE A T 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 MEASURE MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPON
DS TO 0.5 MILLIAMP A.C. ANY VALUE EXCEEDING THIS
LIMIT CONSTITUTED A POTENTIAL SHOCK HAZARD AND MUST BE
CORRECTED IMMEDIATELY.
SUBJECT: GRAPHIC SYMBOLS
SUBJECT: T IPS 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 WHER E DEW IS A FACTOR,
NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS
FACTOR, ETC.
3. AVOID PALCEMNET 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 AN D 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 E QUIVALENT THICKNESS IN
SPACERS) TO PROVIDE ADEQUATE AIP FL OW 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 AGNINST THE MOUNTING OF A
PRDUCT ON SLOPING SHELF OR TILTED POSITION, UNLESS
THE PRODUCT IS PRO PERLY 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 POLE CARPETS.
7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR
STAAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS
LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC
MODEL OF THELVISION RECEIVER OR GENERICALLY
APPROVED FOR USE WITH T.V. S OF THE SAME OR LARGER
SCREEEN SIZE.
8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION
C ORDS, EXPLAIN THAT A FOREST OF EXTENSIONS
SPROUTING FROM A SINGAL OUTLET CAN LEAD TO
DISASTROUS CONSEQUENCES TO HOME AND FAMILY. THE LIGHTNING FASH WITH ARROWHEAD SYMBOL, WITHIN AN
EQUILATE RAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THE
PRESENCE OF UNINSULATED
DANGEROUS VOLTAGE WITHIN THE
PRODUCT
S ENCLOSURE THAT MAY BE OF SUFFCIENT MAGNITUDE TO
CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCELAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS
INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORANT
OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE
LITERATURE ACCOMPANYING THE APPLIANCE.
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1 - 5 SERVICING PRECAUTIONS
CAUTION:
Before servicing the DVD player covered by this service
data and its supplements and addends, 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.
Remembers Safety First:
Gen eral Servicing Precautions
1. Always unplug the DVD player 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) Connection a test substitute in parallel with an
electrolytic 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 player 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,
cottontipped swab, or comparable soft app licator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks
with which instruments covered by this service manual
might be equipped.
5. Do not apply AC power to this DVD player and/or any
of its electrical assemblies unless all solid -state device
heat sinks are correctly 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 bla de of the attachment plug. The
insulat ion resistance between each blade of the
attachment plug and accessible conductive parts (Note 1)
should be more than 1M -ohm.
Note 1: Accessible Conductive Parts including Metal
panels, Input terminals, Earphone jacks, etc.
Electrostatically Sensiti ve (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 handing any semiconductor
component or semiconductor equipped assembl y, 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
an aluminum foil, to prevent electrostatic charge buildup
or exposure of the assembly.
3. Use only a grounded -tip soldering iron t o solder or
unsolder ES devices.
4. Use only an antistatic solder removal device. Some
solder removal devices not classified an antistati c can
generate electric charges sufficient to damage ES
devices.
5. Do not use freonpropelled chemicals. These can
generate electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protect
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 wi ll 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 handing 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.)
