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File name:DP15HS_DP17LS.pdf
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File name DP15HS_DP17LS.pdf

COLOR MONITOR DP15HS/HT DP17LS/LT SERVICE COLOR MONITOR Manual CONTENTS 1. Precautions 2. Product Specifications 3. Disassembly & Reassembly 4. Alignment & Adjustments 5. Troubleshooting 6. Exploded View & Parts List 7. Electrical Parts List 8. Block Diagram EXIT MENU 9. Wiring Diagram 10. Schematic Diagrams Samsung Electronics Co., Ltd. May 1999 Printed in Korea Code No.: BH68-00129A Copyright © 1999 by Samsung Electronics Co., Ltd. All rights reserved. This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of Samsung Electronics Co., Ltd. DP15H*/DP17L* Service Manual First edition May 1999. Printed in Korea. Trademarks Samsung is a registered trademark and DP15H*/DP17L* and MacMaster Cable Adapter are trademarks of Samsung Electronics Co., Ltd. Macintosh, Centris, Quadra, Duo Dock, and Power Macintosh are trademarks of Apple Computer, Inc. All other trademarks are the property of their respective owners. ii DP15H*/DP17L* 1 Precautions 1-1 Safety Precautions WARNINGS 1. For continued safety, do not attempt to modify the circuit board. 2. 3. Disconnect the AC power before servicing. When the chassis is operating, semiconductor heatsinks are potential shock hazards. 3. 2. Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc. Leakage Current Hot Check (Figure 1-1): WARNING: Do not use an isolation transformer during this test. Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7). With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unitŐs AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test. (READING SHOULD NOT BE ABOVE 0.5mA) 1-1-1 Servicing the High Voltage VR and CRT : WARNING:A high voltage VR replaced in the wrong direction may cause excessive X-ray emissions. Caution: When replacing the high voltage adjustment VR, it must be fixed by a soldering iron after it is properly set. 1. When servicing the high voltage system, remove the static charge by connecting a 10 kohm resistor in series with an insulated wire (such as a test probe) between the chassis and the anode lead. If the HV VR requires adjustment, (a) Replace the VR and adjust the high voltage to the specification. (b) Use a soldering iron to melt the adjustment cap on the HV VR to prevent any movement. When

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