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20MU11 Dataheets PDF



Part Number 20MU11
Manufacturers Sharp
Logo Sharp
Description COLOR TELEVISION SERVICE MANUAL
Datasheet 20MU11 Datasheet20MU11 Datasheet (PDF)

20MU11 SERVICE MANUAL COLOR TELEVISION Chassis No. SN-80 MODELS 20MU11 In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used. CONTENTS » » » » » » » » » » Page ELECTRICAL SPECIFICATIONS 1 IMPORTANT SERVICE SAFETY PRECAUTION ....

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20MU11 SERVICE MANUAL COLOR TELEVISION Chassis No. SN-80 MODELS 20MU11 In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used. CONTENTS » » » » » » » » » » Page ELECTRICAL SPECIFICATIONS ......................................................................................................... 1 IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2 LOCATION OF USER'S CONTROL ..................................................................................................... 6 INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 7 CHASSIS LAYOUT ............................................................................................................................ 12 BLOCK DIAGRAM ............................................................................................................................. 13 SCHEMATIC DIAGRAMS .................................................................................................................. 14 PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 18 REPLACEMENT PARTS LIST ........................................................................................................... 23 PACKING OF THE SET ..................................................................................................................... 35 ELECTRICAL SPECIFICATIONS POWER INPUT ................................ 120 V AC 60 Hz POWER RATING ............................................. 82 W PICTURE SIZE ....................... 1,194cm2 (185sq inch) CONVERGENCE ........................................ Magnetic SWEEP DEFLECTION ................................ Magnetic FOCUS ........................... Hi-Bi-Potential Electrostatic INTERMEDIATE FREQUENCIES Picture IF Carrier Frequency ................. 45.75 MHz Sound IF Carrier Frequency .................. 41.25 MHz Color Sub-Carrier Frequency ................ 42.17 MHz (Nominal) AUDIO POWER OUTPUT RATING ........... 0.9 W (at 10% distortion) SPEAKER SIZE .................................................. 8 cm (Round) VOICE COIL IMPEDANCE ........... 8 ohm at 400 Hz ANTENNA INPUT IMPEDANCE VHF/UHF ................................ 75 ohm Unbalanced TUNING RANGES VHF-Channels .......................................... 2 thru 13 UHF-Channels........................................ 14 thru 69 CATV Channels ...................................... 1 thru 125 (EIA, Channel Plan U.S.A.) Specifications are subject to change without prior notice. This document has been published to be used for after sales service only. 1 The contents are subject to change without notice. SHARP CORPORATION 20MU11 IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: WARNING 1. For continued safety, no modification of any circuit should be attempted. 2. Disconnect AC power before servicing. 3. Semiconductor heat sinks are potential shock hazards when the chassis is operating. 4. The chassis in this receiver has two ground systems which are separated by insulating material. The nonisolated (hot) ground system is for the B+ voltage regulator circuit and the horizontal output circuit. The isolated ground system is for the low B+ DC voltages and the secondary circuit of the high voltage transformer. To prevent electrical shock use an isolation transformer between the line cord and power receptacle, when servicing this chassis. CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 4A125V FUSE. X-RADIATION AND HIGH VOLTAGE LIMITS 1. Be sure all service personnel are aware of the procedures and instructions covering X-radiation. The only potential source of X-ray in current solid state TV receivers is the picture tube. However, the picture tube does not emit measurable X-Ray radiation, if the high voltage is as specified in the "High Voltage Check" instructions. It is only when high voltage is excessive that Xradiation is capable of penetrating the shell of the picture tube including the lead in the glass material. The important precaution is to keep the high voltage below the maximum level specified. 2. It is essential that servicemen have available at all times an accurate high voltage meter. The calibration of this meter should be checked periodically. 3. High voltage should always be kept at the rated value -no higher. Operation at higher voltages may cause a failure of the picture tube or high voltage circuitry and;also, under certain conditions, may produce radiation in exceeding of desirable levels. 4. When the high voltage regulator is oper.


DTA124XKA 20MU11 C5239


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