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File name sharp LC-20A2M.pdf

LC-20A2M TENTATIVE SERVICE MANUAL S00K2LC-20A2H LCD COLOUR TELEVISION MODEL LC-20A2M Page 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 » » » » » » » » » » » » IMPORTANT SERVICE SAFETY PRECAUTION ... 2 SPECIFICATIONS ... 3 OPERATION MANUAL ... 4 DIMENSIONS ... 5 REMOVING OF MAJOR PARTS ... 6 TROUBLE SHOOTING TABLE ... 9 ADJUSTMENT PROCEDURE ... 12 CHASSIS LAYOUT ... 14 BLOCK DIAGRAM ... 16 DESCRIPTION OF SCHEMATIC DIAGRAM .. 18 SCHEMATIC DIAGRAM ... 19 PRINTED WIRING BOARD ASSEMBLIES ... 29 » PARTS LIST Л ELECTRICAL PARTS ... 34 MAIN UNIT ... 34 Y/C SEPARATION UNIT ... 38 TERMINAL UNIT ... 40 INVERTER UNIT ... 41 OPERATION UNIT ... 42 Л CABINET AND MECHANICAL PARTS ... 42 Л SUPPLIED ACCESSORIES ... 44 Л PACKING PARTS ... 44 » PACKING OF THE SET ... 45 The component parts of this model are partially different depending on their suffix symbols. Before servicing the units, be sure to check the suffix symbol on the model label that is applied on the back of the unit. Example of suffix symbol: LCD COLOUR TV MODEL LC-20A2M 13V 3.7A, 48W SERIAL NO. SHARP CORPORATION MADE IN JAPAN X xxxxxxxxx N1 Suffix "X" for Australlia SHARP CORPORATION 1 LC-20A2M IMPORTANT SERVICE SAFETY PRECAUTION Л Service work should be perfomed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: · Use an AC voltmeter having with 5000 ohm per volt, or higher, sensitivity or measure the AC voltage drop across the resisor. · Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon and etc.) and measure the AC voltage drop across the resistor. All checks must be repeated with the AC cord plug connection reversed. (If necessary, a nonpolarized adaptor plug must be used only for the purpose of completing these checks.) Any reading of 35V peak (this corresponds to 0.7 milliamp. peak AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the monitor to the owner. WARNING 1. For continued safety, no modification of any circuit should be attempted. 2. Disconnect AC power