Prology dvd 557 service manual
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PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS CAUTION: DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WA Y AND NEVER SUBJECT: X-RADIATION PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUF ACTURER'S APPROVAL. NAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY , BUT MAY LEAD TO 1.BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL COVER THE\ YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY . SUBJECT OF X-RADIATION. THE ONL Y POTENTIAL SOURCE OF X-RAYS IN CURRENT T .V. RECEIVERS IS THE PICTURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RYS WH\ EN THE SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY F AMILIAR HIGH VOLTAGE IS AT THE F ACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO \ APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USE\ R . THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND , UNDER CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIRABLE LEVELS. .WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. \ LINE SHOCK. 2. ONLY FACTORY SPECIFIED C.R.T ANODE CONNECTORS MUST BE USED DEGAUSSING SHIELDS ALSO SERVE AS AN X-RAY SHIELD IN COLOR SETS, SAFETY CHECKS ALWAYS RE-INSTALL THEM. AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED, A CHECK SHOULD BE\ 3. IT IS ESSENTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND MADE OF THE FOLLOWING. 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. SUBJECT: FIRE & SHOCK HAZARD 4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY, THERE IS NO 1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS TO AVOID \ POSSIBILITY OF AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRATION OF POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT O\ N THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, THOSE MODULES WITCH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP . SUCH AS THE ONE AVAILABLE AT YOUR DISTRIBUTOR . 2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS INSULATO\ RS , 5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT WITH A\ BARRIERS, COVERS, SHIELDS, STRAIN RELIEF S, POWER SUPPLY CORDS, AND OTHER PROBLEM OF EXCESSIVE HIGH VOLTAGE AVOID BEING UNNECESSARIL Y CLOSE TO THE HARDWARE HAVE BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAF\ ETY PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY DO NOT OPERATE THE PRODUCT LONGER PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED. THAN IT IS NECESSARY TO LOCATE THE CAUSE OF EXCESSIVE VOLTAGE. 3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, \ 6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE APPROPRIATE SCHEMATIC AND DIAGRAMS(WHERE USED). FOREIGN PARTICLES. 4. CHECK FOR PHYSICAL EVIDENCE DF DAMAGE OR DETERIORATION TO PARTS AND SUBJECT: IMPLOSION COMPONENTS, FOR FRAYED LEADS AND DAMAGED INSULATION (INCLUDING A .C. CORD), AND REPLACE IF NECESSARY FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND\ 1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTEGRAL IMPLOSI\ ON DRESS. PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID SCRA TCHING THE TUBE. IF SCRATCHED REPLACE IT . 5. NO LEAD OR COMPONENT SHOULD TOUCH A RECEIVING TUBE OR A RESISTOR RATE\ D AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUDING MET AL SURFACES MUST BE 2. USE ONLY RECOMMENDED FACT ORY REPLACEMENT TUBES. AVOIDED. SUBJECT: TIPS ON PROPER INSTALLATION 6. ALL CRITICAL COMPONENTS SUCH AS FUSES. FLAMEPROOF RESISTORS, CAP ACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES , DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS. CUBBYHOLE OR CLOSEL Y MODIFICATIONS. FITTING SHELF SPACE, OVER OR CLOSE T O HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW. 7. AFTER RE-ASSEMBLY OF THE SET, AL WAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET , (THE CHANNEL SELECTOR KNOB, ANTENNA 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS TERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERA TE WITHOUT WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURI\ NG ETC. THIS TEST, MAKE SURE TO USE AN A.C . VOLTMETER. HAVING 5000 OHMS PER VOL T OR MORE SENSITIVITY, IN THE FOLL OWING MANNER; CONNECT A 1500 OHMS 10 WATT 3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER RESISTOR, P ARALLELED BY A.15 MFD. 150V A.C. TYPE CAP ACITOR BETWEEN A KNOWN SHOULD ALSO AVOID THE USE OF DECORA TIVE. SCARVES OR OTHER COVERINGS WHICH GOOD EARTH GROUND (WATER PIPE, CONDUIT, ET C.) AND THE EXPOSED METALLIC PARTS, MIGHT OBSTRUCT VENTILATION. ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMB INATION OF 1500 OHM 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL MOUNTING KIT, RESISTOR AND 15 MFD CAPACITOR . REVERSE THE A.C. PLUG AND REPEAT A.C. ANY MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS. A PRODUCT VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE MUST NOT EXCEED 75 VOLTS R .M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C. ANY EQUIVALENT THICKNESS IN SPACERS). T O PROVIDE ADEQUATE AIR FLOW ACROSS THE VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE BOTTOM. BOLTS OR SCREWS USED FOR F ASTENERS MUST NOT TOUCH ANY PARTS OR CORRECTED IMMEDIATELY . 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 T O 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 BE\ EN GOOD EARTH GROUND LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MO\ DEL OF SUCH AS THE WATER TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH TV'S OF THE SAM\ E OR PIPE, CONDUIT, ETC . 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 DISASTRO\ US SUBJECT GRAPHIC SYMBOLS CONSEQUENCES TO HOME AND FAMILY. The lightening flash 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 sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to aler\ t the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.\ PLACE THIS PROBE ON EACH EXPOSED METAL P ART 0015
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CAUTION : Before servicing the DVD covered by this service Electrostatically Sensitive (ES) Devices data and its supplements and ADDENDUMS, read and Some semiconductor (solid state) devices can be follow the SAFETY PRECAUTIONS NOTE : if unforeseen damaged easily by static electricity. Such components circumstances create conflict between the following commonly are called Electrostatically Sensitive (ES) Devices. servicing precautions and any of the safety precautions in Examples of typical ES devices are integrated circuits and this publications, always follow the safety Precautions. some field effect transistors and semiconductor chip Remember Safety First: components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. General Servicing Precautions 1. Immediately before handling any emiconductor 1. Always unplug the DVD DC power cord from the DC component or semiconductor-equipped assembly, drain power source before: off any electrostatic charge on your body by touching a (1) Removing or reinstalling any component, circuit board, known earth ground. Alternatively, obtain and wear a module, or any other assembly . commercially available discharging wrist strap device, (2) Disconnection or reconnecting any internal electrical which should be removed for potential shock reasons plug or other electrical connection. prior to applying power to the unit under test. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an 2. After removing an electrical assembly equipped with ES explosion hazard. devices, place the assembly on a conductive surface such as aluminum toil, to prevent electrostatic charge 2. Do not spray chemicals on or near this DVD or any of its buildup or exposure of the assembly. assemblies. 3. Use only a GROUNDED-tip soldering iron to solder or 3. Unless specified otherwise in this service data, clean unsolder ES devices. electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, 4. Use only an anti-static solder removal device. Some cotton-tipped swab, or comparable soft applicator . solder removal devices not classified a "anti-static" can Unless specified otherwise in this service data, lubrication generate electrical charges sufficient to damage ES of contacts is not required. devices. 4. Do not defeat any plug/socket B+ voltage interlocks with 5. Do not use freon-propelled chemicals. These can which instruments covered by this service manual might generate electrical charge sufficient to damage ES be equipped. devices. 5. Do not apply AC power to this DVD and/or any of its 6. Do not remove a replacement ES device from its electrical assemblies unless all solid-state device heat protective package until immediately before you are sinks are correctly installed ready to install it. (Most replacement ES devices are . packaged with leads electrically shorted together by 6. Always connect test instrument ground lead to the conductive foam, aluminum foil, or comparable appropriate ground before connection the test conductive material.) instrument positive lead. Always remove the test instrument ground lead last. 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 Insulation Checking Procedure which the device will be installed. Disconnect the attachment plug trom the AC outlet and Caution : Be sure no power is applied to the chassis or turn the power on. Connect an insulation resistance circuit, and observe all other safety precautions. meter(500V) to the blades of the attachment plug. The insulation resistance between each blade of the 8. Minimize bodily motions when handling unpackaged attachment plug and accessible conductive parts (Note 1) replacement ES devices. (Normally harmless motion should be more than 1M ohm. such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can Note 1 : Accessible Conductive Parts including Metal generate static electricity sufficient to damage an ES panels, input terminals, Earphone jacks , etc. device.) SERVICING PRECAUTIONS 0016