Acer AL718 Посібник з експлуатації - Сторінка 4

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SAFETY PRECAUTIONS

1. CAUTION:

No modification of any circuit should be attempted.

Service work should only be performed after you

are throughly familiar with all of the following safety

checks and servicing guide lines.

2. SAFETY CHECK

Care should be taken while servicing this LCD

display.

Because of the high voltage used in the

inverter circuit. These voltage are exposed in such

areas as the associated transfomer circuits.

3. POWER SUPPLY REQUIREMENTS

The external powr converter for this display

utilizes AC and DC cords ,

detachable , but DC cord is permanently

attached . Any attempt to

adapter could result in serious problem on the

display.

4. LEAKAGE CURRENT HOT CHECK

4-1 Plug the AC cord directly into the AC outlet.

Do not use an isolation transformer during this

check.

4-2 Connect a

1500 ohm , 10 watt resistor ,

paralleled by a 0.15uF capacitor between each

metallic part and a good earth ground.

4-3 Use an AC voltmeter with 1000 ohm / volt or

more sensitivity and measure the AC voltage

across the combination 1500 ohm resistor

and 0.15uF capacitor.

4-4 Move the resistor connection to each exposed

metallic part and measure the voltage.

4-5 Reverse the polarity of the AC plug in the AC

outlet and repeat the above measurement.

AL718

AC cord is

replace another

4-6 Voltage measured must not exceed 1.5 vol

RMS, from any exposed metallic part to th

ground. A leakage current tester may be

used in the above hot check, in which case

any circuit measured must not exceed 1.0

miliamp. In the case of a measurement

exceeding the 1.0 miliamp value, a rework i

required to eliminate the chance of a shock

hazard.

AC VOLTMETER

To Metal Parts

1500

0.15u

10W

Earth Ground

B-1