Product Safety Servicing Guidelines For Video Products - NAD T 562 Service Manual

PRPDUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
CAUTION: DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN
ANYWAY. NEVER PERFORM CUSTOMINIZED INSTALLATIONS
WITHOUT MANUFACTURER ' S
MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY
LEAD TO YOUR BEING LIABLE FOR ANY RESULTING 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 POSITIONED 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, COVERS, 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
DETERRIORATION 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
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, HAVING 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 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 MEASURE MUST NOT EXCEED 75 VOLTS R.M.S. THIS
APPROVAL. UNAUTHORIZED
EVIDENCE OF DAMAGE
CORRESPONDS TO 0.5 MILLIAMP A.C. ANY VALUE EXCEEDING THIS
LIMIT CONSTITUTED A POTENTIAL SHOCK HAZARD AND MUST BE
CORRECTED IMMEDIATELY.
SUBJECT: GRAPHIC SYMBOLS
THE LIGHTNING FASH WITH ARROWHEAD SYMBOL, WITHIN AN
EQUILATERAL 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.
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
FACTOR, ETC.
3. AVOID PALCEMNET WHERE DRAPERIES MAY OBSTRUCT
OR
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
MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS
ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN
SPACERS) TO PROVIDE ADEQUATE AIP 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 AGNINST THE MOUNTING OF A
PRDUCT ON SLOPING SHELF OR 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 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
CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS
SPROUTING FROM A SINGAL OUTLET CAN LEAD TO
DISASTROUS CONSEQUENCES TO HOME AND FAMILY.
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INSTRUCTIONS A PRODUCT