Precautions - Kortek KT-2914F Service Manual

1.Precautions

1-1. Safety precautions
Warnings :
The followings are the necessary precautions to be observed before servicing.
1) For continued safety, do not attempt to modify the circuit board.
2) Disconnect the AC power before servicing.
3) When the chassis is operating, semiconductor heat sinks are potential
1-1-1 Servicing the high voltage volume are CRT Warnings
A High Voltage volume replaced in the wrong direction may cause excessive
X-Ray emissions.
1) Adjust in order to 26KV with signal at Anode.
2)
3)
4)
5) The CRT is especially designed to prohibit X-ray emission. To ensure
6) Handle the CRT only when wearing shatterproof goggles and after completely.
7) Do not lift the CRT by the neck.
Service should not be attempted by anyone unfamiliar with the
necessary on this Monitor.
shock hazards.
When the troubleshooting a monitor with excessively High Voltage, avoid
being unnecessarily close to the monitor. Do not operate the monitor for
longer than is necessary to locate the cause of excessive voltage.
Excessive High Voltage can produce potentially hazardous X-Ray RADIA-
TION. To avoid such hazards, the high voltage must be above the
specified limit. The nominal value of the High voltage of this Monitor is
26KV ¡¾ 0.3KV at zero beam current(minimum brightness) under a 120V
AC power source. The High Voltage must not (under any circumstances)
exceed 29KV. Each time a monitor requires servicing, the High Voltage
should be checked following the High Voltage check procedure on this
manual. It is recommended the reading of the voltage be recorded as a
part of the service record. It is important to use an accurate and reliable
High Voltage meter.
When the High Voltage regulator is operating properly, there is no possib-
ility of an X-Ray problem.
continued X-ray protection, replace the CRT only with one that is the
same or equivalent type as the original.