Samsung 740NW free download

File name 740NW.pdf

1 Precautions 1 Precautions Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock. 1-1 Safety Precautions 1-1-1 Warnings 1. For continued safety, do not attempt to modify the circuit board. 2. Disconnect the AC power and DC power jack before servicing. 1-1-2 Servicing the LCD Monitor 1. When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet. 2. It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of this meter periodically. 1-1-3 Fire and Shock Hazard Before returning the monitor to the user, perform the Figure 1-1. Leakage Current Test Circuit following safety checks: 1. Inspect each lead dress to make certain that the leads are 4. With the unit completely reassembled, plug the AC line not pinched or that hardware is not lodged between the cord directly into a 120V AC outlet. With the unit's AC chassis and other metal parts in the monitor. switch first in the ON position and then OFF, measure 2. Inspect all protective devices such as nonmetallic control the current between a known earth ground (metal water knobs, insulating materials, cabinet backs, adjustment pipe, conduit, etc.) and all exposed metal parts, and compartment covers or shields, isolation resistor- including: metal cabinets, screwheads and control shafts. capacitor networks, mechanical insulators, etc. The current measured should not exceed 0.5 milliamp. 3. Leakage Current Hot Check (Figure 1-1): Reverse the power-plug prongs in the AC outlet and repeat the test. WARNING : Do not use an isolation transformer during this test. Use a leakage current tester or a metering system that 1-1-4 Product Safety Notices complies with American National Standards Institute Some electrical and mechanical parts have special safety- (ANSI C101.1, Leakage Current for Appliances), and related characteristics which are often not evident from visual Underwriters Laboratories (UL Publication UL1410, inspection. The protection they give may not be obtained by 59.7). replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by on schematics and parts lists. A substitute