Samsung 02 Precaution free download

File name 02_Precaution.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 4. With the unit completely reassembled, plug the AC are not pinched or that hardware is not lodged between line cord directly into a 120V AC outlet. With the the chassis and other metal parts in the monitor. unit's AC switch first in the ON position and then 2. Inspect all protective devices such as nonmetallic OFF, measure the current between a known earth control knobs, insulating materials, cabinet backs, ground (metal water pipe, conduit, etc.) and all adjustment and compartment covers or shields, exposed metal parts, including: metal cabinets, isolation resistor-capacitor networks, mechanical screwheads and control shafts. The current measured insulators, etc. should not exceed 0.5 milliamp. Reverse the power- 3. Leakage Current Hot Check (Figure 1-1): plug prongs in the AC outlet and repeat the test. WARNING: Do not use an isolation transformer during 1-1-4 Product Safety Notices this test. Some electrical and mechanical parts have special Use a leakage current tester or a metering system that safety-related characteristics which are often not evident complies with American National Standards Institute from visual inspection. The protection they give may not (ANSI C101.1, Leakage Current for Appliances), and be obtained by replacing them with components rated for Underwriters Laboratories (UL Publication UL1410, higher voltage, wattage, etc. Parts that have special safety 59.7). characteristics are identified by on schematics and parts