ADVENT Advent DV2418 service manual free download

File name Advent DV2418_service_manual.pdf

CONTENTS X-RAY RADIATION PRECAUTION...1 SAFETY PRECAUTION...1 PRODUCT SAFETY NOTICE...2 GENERAL INSTRUCTION...2 ALIGNMENT ITEMS AND PROCEDURE...2 FACTORY ADJUSTMENT MODE...4 ADJUSTMENT METHOD...4 CHECKING POINTS...6 OUT-FACTORY MODE PRESET...6 POWER ADAPTABILITY CHECK...7 USA CHANNEL FREQUENCY TABLE (181 CH)...15 WIRING DIAGRAM...17 BLOCK DIAGRAM...18 IC BLOCK DIAGRAM...19 SCHEMATIC DIAGRAM...27 ELECTRICAL PARTS LIST...29 0 CAUTION: THIS SERVICE MANUAL IS ONLY FOR PROFESSIONAL SERVICE PERSONNEL'S REFERENCE. BEFORE SERVICING THIS CHASSIS, PLEASE READ THE FOLLOWING NOTICE ITEMS. 1. SAFETY INSTRUCTION AND GENERAL INSTRUCTION Before servicing and aligning this equipment, please read the following "X-RAY RADIATION PRECAUTION" ,"SAFETY PRECAUTION" and "PRODUCT SAFETY NOTICE". 1.1 X-RAY RADIATION PRECAUTION 1 Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not be above the specified limit. The normal value of the high voltage of this receiver is under 30 kV at zero beam current (minimum brightness) under DC135V main power(B+) , the high voltage must not, under any circumstances, exceed 32 kV. 2 Each time a receiver requires servicing, the high voltage should be checked following the HIGH VOLTAGE CHECK procedure in this manual. It is recommended the reading of the high voltage be recorded as a part of service record. It is important to use an accurate and reliable high voltage meter. * When checking, main power (B+) should be kept at (135 V : for 24", 100V : for 20"). 3 The primary source of X-RAY RADIATION in this TV receiver is the picture tube. For continuous X-RAY RADIATION protection, the replacement tube must be exactly the same type tube as specified