Samsung 650MX Service Manual - Page 4

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1. Precautions

1-1. Safety Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as

electrical shock.

1-1-1. Warnings

For continued safety, do not attempt to modify the circuit board.

Disconnect the AC power before servicing.

1-1-2. Servicing the LCD Monitor

When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.

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 following safety checks:

Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the

chassis and other metal parts in the monitor.

Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and

compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.

Leakage Current Hot Check (Figure 1-1):

WARNING : Do not use an isolation transformer during this test.

DEVICE

UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

2-WIRE CORD

*ALSO TEST WITH

PLUG REVERSED

(USING AC ADAPTER

PLUG AS REQUIRED)

With the unit completely reassembled, plug the AC line cord directly into AC outlet. With the unit's 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.

1-1-4. Product Safety Notices

Some electrical and mechanical parts have special safetyrelated characteristics which are often not evident from visual

inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage,

wattage, etc. Parts that have special safety characteristics are identified by

replacement that does not have the same safety characteristics as the recommended replacement part might create

shock, fire and/or other hazards. Product safety is under review continuously and new instructions are issued whenever

appropriate.

(READING SHOULD)

NOT BE ABOVE 0.5mA

LEAKAGE

CURRENT

TESTER

EARTH

GROUND

Figure 1-1. Leakage Current Test Circuit

on schematics and parts lists. A substitute

1. Precautions

1-1