AG Neovo AIC U-17, Руководство по обслуживанию

Страница: 4 / 59

AG Neovo U-17 service manual
Page of 59 4
3. POWER SUPPLY REQUIREMENTS
The external power converter for this display utilizes AC and DC cords. AC cord is detachable,
But DC cord is permanently attached. Any attempt to replace another 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.
4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground. A leakage current tester may be used in the
above hot check, in which case any circuit measured must not exceed 1 milliamp. In the case of a measurement exceeding the 1 milliamp value, a
rework is required to eliminate the chance of a shock hazard.
To Metal Parts
V
AC VOLTMETER
1500 10W
0.15u
.
Earth Ground