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24211222 Datasheet(PDF) 3 Page - Toshiba Semiconductor |
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24211222 Datasheet(HTML) 3 Page - Toshiba Semiconductor |
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3 / 50 page  – 3 – Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety charac- teristics are identified in this manual and its supplements; electrical components having such features are identified by the international hazard symbols on the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray radia- tion or other hazards. PRODUCT SAFETY NOTICE CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW. Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF, AC type capacitor, between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combi- nation of 1500 ohm resistor and 0.15 µF capacitor. Re- verse the AC plug at the AC outlet and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.3 volts rms. This corresponds to 0.2 milliamp. AC. Any value exceeding this limit consti- tutes a potential shock hazard and must be corrected im- mediately. WARNING : Service should not be attempted by anyone unfa- miliar with the necessary precautions on this receiver. The fol- lowing are the necessary precautions to be observed before servicing this chassis. 1. An isolation Transformer should be connected in the power line between the receiver and the AC line before any serv- ice is performed on the receiver. 2. Always discharge the picture tube anode to the CRT con- ductive coating before handling the picture tube. The pic- ture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter proof goggles and keep picture tube away from the unprotected body while handling. 3. When replacing a chassis in the cabinet, always be cer- tain that all the protective devices are put back in place, such as; non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc. 4. Before returning the set to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, screwheads, metal overlays, control shafts etc. to be sure the set is safe to operate without danger of electrical shock. Plug the AC line cord directly into a 120V AC outlet (do not use a line isolation transformer during this check). Use an AC volt- meter having 5000 ohms per volt or more sensitivity in the following manner: AC VOLTMETER 0.15 µF Good earth ground such as a water pipe, conduit, etc. Place this probe on each exposed metallic part. 1500 ohm 10 watt SAFETY PRECAUTION 1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high volt- age must not be above the specified limit. The nominal value of the high voltage of this receiver is (A) kV at zero beam current (minimum brightness) under a 120V AC power source. The high voltage must not, under any cir- cumstances, exceed (B) kV. Refer to table-1 for high voltage (A), (B). (See SETTING & ADJUSTING DATA on page 17) Each time a receiver requires servicing, the high voltage should be checked following the HIGH VOLTAGE CHECK procedure in this manual. It is recommended that the read- ing of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage meter. 2. This receiver is equipped with a Fail Safe (FS) circuit which prevents the receiver from producing an excessively high voltage even if the B+ voltage increases abnormally. Each time the receiver is serviced, the FS circuit must be checked to determine that the circuit is properly functioning, follow- ing the FS CIRCUIT CHECK procedure in this manual. 3. The only source of X-RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION pro- tection, the replacement tube must be exactly the same type tube as specified in the parts list. 4. Some part in this receiver have special safety-related char- acteristics for X-RAY RADIATION protection. For contin- ued safety, parts replacement should be undertaken only after referring to the PRODUCT SAFETY NOTICE below. X-RAY RADIATION PRECAUTION |
Similar Part No. - 24211222 |
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Similar Description - 24211222 |
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