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2-4 HIGH VOLTAGE WARNING
Operation of monitor outside of cabinet or with back removed may cause a serious shock hazard. Work on this model should only be
performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment.
Exercise care when servicing this chassis with power applied. Many B plus and high voltage terminals are exposed which, if carelessly
contacted, can cause serious shock or result in damage to the chassis. Maintain interconnecting ground lead connections between chassis
and picture tube dag when operating chassis.
Certain HV failures can increase X-ray radiation. Monitor should not be operated with HV
levels exceeding
the specified rating for
the chassis type. The maximum operating HV specified for the chassis used in this monitor is
24.5KV
±
1KV
with a line voltage of 120/240 VAC. Higher voltage may also increase possibility of failure in HV supply.
It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere else in the monitor
that could cause a rise in high voltage or operating supply voltages. No changes should be made to the original design of the monitor.
Components shown in the shaded areas on the schematic should be replaced with exact factory replacement parts. The use of
unauthorized substitute parts may create a shock, fire or other hazard.
To determine the presence of high voltage, use an accurate, high impedance, HV meter connected between second anode lead and CRT
dag grounding device. When servicing the High Voltage System, remove static charge from it by connecting a 10K ohm resistor in series
with an insulated wire (such as a test probe) between picture tube dag and 2nd anode lead.(AC line cord disconnected from AC power
outlet.)
The picture tube used in this monitor employs integral implosion protection. Replace with tube of the same type number for continue
safety. Do not lift picture tube by the neck. Handle the picture tube only after discharging the high voltage completely.
Page
6
of
59
4V SERIES MANUAL
05.06.2002
file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V
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C551.htm