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DS20424 Dataheets PDF



Part Number DS20424
Manufacturers Sanyo
Logo Sanyo
Description Remote Control Color TV Service Manual
Datasheet DS20424 DatasheetDS20424 Datasheet (PDF)

AS FILE NO. SERVICE MANUAL Remote Control Color Television DS20424 (U.S.A.) (CANADA) ORIGINAL VERSION Chassis No. 20424-00 NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service Manual. If the Original Version Service Manual Chassis No. does not match the unit’s, additional Service Literature is required. You must refer to “Notices” to the Original Service Manual prior to servicing the unit. AS Contents Safety Instructions . . . . . . . . . . . . . . . . .

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AS FILE NO. SERVICE MANUAL Remote Control Color Television DS20424 (U.S.A.) (CANADA) ORIGINAL VERSION Chassis No. 20424-00 NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service Manual. If the Original Version Service Manual Chassis No. does not match the unit’s, additional Service Literature is required. You must refer to “Notices” to the Original Service Manual prior to servicing the unit. AS Contents Safety Instructions . . . . . . . . . . . . . . . . . . 2 Service Adjustments . . . . . . . . . . . . . 3 - 10 Service Hints . . . . . . . . . . . . . . . . . . . . . . 11 Mechanical Disassemblies. . . . . . . . . . . 12 Chassis Electrical Parts List . . . . . . 13 - 19 Cabinet Parts List . . . . . . . . . . . . . . . . . . 20 Component and Test Point Locations . . . . . . . . . . . . . . . . . . . 21 - 24 Schematic Insert . . . . . . . . . . . . . . . 25 - 32 Schematic Notes . . . . . . . . . . . . . . . . . 25 Pin Layouts . . . . . . . . . . . . . . . . . . . . . 25 Capacitor and Resistor Codes . . . . . . 25 Block Diagram . . . . . . . . . . . . . . . 26 - 27 Voltage Charts . . . . . . . . . . . . . . . 26 - 27 Waveforms. . . . . . . . . . . . . . . . . . . . . . 28 Schematic Diagrams . . . . . . . . . . 29 - 32 Specifications Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz 65W (Avg), 1.4A (Max) Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω UHF/VHF/CATV Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF), 14 - 69 (UHF), 01, 14-94, 95-125 (CATV) Remote Ready . . . . . . . . . . 24 Key Remote Control Sound Output . . . . . . . . . . . . . . . . . . . . . . 1.0 W/CH Intermediate Frequency Picture IF Carrier . . . . . . . . . . . . . . . . . . 45.75MHz Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz Picture Tube . . . . . . . . . . . . . . . . . A51QDX993X001 Semiconductors Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . . 8 Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Except within Tuner and RC Pre-Amp. Cabinet Dimensions Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 588mm Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 466mm Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493mm DS20424, G8TGM, PRODUCT CODE 111367886 REFERENCE No. SM780099 SAFETY INSTRUCTIONS SAFETY PRECAUTIONS WARNING: The chassis of this receiver has a floating ground with the potential of one half the AC line voltage in respect to earth ground. Service should not be attempted by anyone not familiar with the precautions necessary when working on this type of equipment. The following precautions must be observed: 1. An isolation transformer must be connected in the power line between the receiver and the AC line before any service is performed on the receiver. 2. Comply with all caution and safety-related notes provided on the side of the cabinet, inside the cabinet, on the chassis, and the picture tube. 3. When replacing a chassis in the cabinet, always be certain that all the protective devices are installed properly, such as control knobs, adjustment covers, shields and barriers. DO NOT OPERATE THIS TELEVISION RECEIVER WITHOUT THE PROTECTIVE SHIELD IN POSITION AND PROPERLY SECURED. 4. Before replacing the back cover of the set, thoroughly inspect the inside of the cabinet to see that no stray parts or tools have been left inside. Before returning any television to the customer, the service technician must perform the following safety checks to be sure that the unit is completely safe to operate without danger of electrical shock. AC OUTLET READING SHOULD NOT EXCEED 750 mV. AC VOLTMETER (5000 ohms per volt or more sensitivity) TELEVISION RECEIVER 1500 ohm 10 watt Good earth ground such as a water pipe, conduit, etc. 0.15 F 150V AC To be touched to all of exposed metal parts. Voltmeter Hook-up for Leakage Current Check. X-RADIATION PRECAUTION The primary source of X-RADIATION in solid-state receivers is the picture tube. The picture tube is specially constructed to limit X-Ray emission. For continued X-RADIATION protection, the replacement tube must be the same type as the original (including the suffix letter in the part numbers). Excessive high voltage may produce potentially hazardous X-RADIATION. To avoid such hazards, the high voltage must be maintained within specific limits. Refer to the X-RADIATION WARNING NOTE on the CHASSIS SCHEMATIC in this service manual for specific high voltage limits. If the high voltage exceeds specified limits, check the components specified on the chassis schematic diagram and take the necessary corrective action. Carefully follow the instructions for the +B Voltage Check and the High Voltage Check to maintain the high voltage within the specified limits. ANTENNA COLD CHECK Remove AC plug from the 120 VAC outlet and place a jumper across the tw.


IRFZ34L DS20424 18F45K80


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