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1. Precautions and Notices
1.1 Safety Precautions
1) Observe all cautions and safety related notes located inside the display cabinet and on the display
chassis.
2) Operation of these displays outside the cabinet or with the cover removed involves a shock hazard
from the display power supplies. Work on the display should not be attempted by anyone who is
not thoroughly familiar with precautions necessary when working on high voltage equipment.
3) Do not install, remove or handle the picture tube in any manner unless shatter-proof goggles
are worn. People not equipped should be kept away while handling picture tube.
4) The picture tube is constructed to limit X-RADIATION to 0.5mR/HR at 300 microamperes anode
current. For continued protection, use the recommended replacement tube only, and adjust the
voltage so that the designated maximum rating at the anode will not be exceeded.
5) Before returning a serviced display to the customer, a thorough safely test must be performed to
verify that the display is safe to operate without danger or shock. Always perform an AC leakage
current check on the exposed metallic parts of the cabinet. Proceed as follows :
Connect the monitor power lead to the mains supply, via an isolation transformer, and switch on.
Using the test circuit shown in Fig.1-1, measure the AC leakage current between each pole ( L
and N) of the supply and all accessible metal parts. The earth leakage current must not exceed 3.5
mA.
L
Mains N
Input E
Connectto
ExposedMetal
Parts
MeasuringCircuit
Resistance=2000 ohms
Fig.1-1 AC Leakage Current Test Circuit
mA
