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File name Ch. PX20030 TDA9377 KA5Q1265.pdf

CONTENTS Safety instruction...1 General instruction...1 Alignment instruction...2 Alignment f low ... ... ...2 A l i g n m e n t m e t h o d ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... . .3 BLOCK DIAGRAM... 8 MAIN IC... 9 Exploded view...13 Part list ...15 Schematic diagram...32 Note: This service manual is only for professional service personnel's reference. Before servicing the unit, please read the following items carefully. 1 safety instruction 1.1 X-RAY radiation precaution 1.1.1 Excessive voltage will cause harmful X-ray. To avoid this radiation hazard, the high voltage should fall within the limitation. The appliance works at AC 120V, 60Hz. The high voltage of zero beam current should be within 29.0kV on condition that the main power (B+) voltage is AC135V. And it should not exceed 30kV in any condition. * Keep the main power voltage at 135V when checking the high voltage. 1.1.2 The primary source of X-RAY RADIATION is the CRT. The CRT of this TV set have gotten the approval of safety authentication inspection. The replacement CRT should be exactly the same type and specification CRT which has gotten a similar safety approval, and check the high voltage according to the HIGH VOLTAGE CHECK procedure. 1.2 safety precaution a. Since the power supply circuit of this receiver is directly connected to the AC power line, an isolation transformer is necessary during dynamic service to avoid possible shock hazard. b. Always discharge the graphite layer conductor when moving the CRT. c. Disconnect the power cord before replacing parts. d. When replacing high-power resistor, keep the resistor 10 mm away from the circuit board. 1.3 Component safety precaution Many electrical and mechanical parts in the chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection. Replacement parts which have these special safety characteristics are identified in this manual and its supplement electrical components having such features are shaded or marked by 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