Sharp 20ks100

20K-S100, CK20S10, 21MK50

SERVICE MANUAL
S48O920K-S100

COLOR TELEVISION

Chassis No. SN-80

MODELS

20K-S100 CK20S10/21MK50

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.

Page » ELECTRICAL SPECIFICATIONS......................................................................................................... 1 » IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................ 2 » LOCATION OF USER'S CONTROL ..................................................................................................... 6 » INSTALLATION AND SERVICE INSTRUCTIONS............................................................................... 7 » CHASSIS LAYOUT ............................................................................................................................ 13 » BLOCK DIAGRAM ............................................................................................................................. 14 » SCHEMATIC DIAGRAMS.................................................................................................................. 15 » PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 19 » REPLACEMENT PARTS LIST ........................................................................................................... 23 » PACKING OF THE SET..................................................................................................................... 31

CONTENTS

ELECTRICAL SPECIFICATIONS
POWER INPUT ............................... 120 V AC 60 Hz POWER RATING ............................................... 88 W PICTURE SIZE ....................... 1,240cm2 (192sq 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 1.3W + 1.3W (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 PlanU.S.A.)

Specifications are subject to change without prior notice.

SHARP CORPORATION

This document has been published to be used for after sales service only. 1 The contents are subject to change without notice.

20K-S100, CK20S10, 21MK50

IMPORTANT SERVICE SAFETY PRECAUTION
Service work should be performed only by qualified service technicians who are thoroughly familiar with allsafety 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) groundsystem 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...