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5.4.0 MAINTENANCE
5.4.1 CRT Safety
I
DANGER
All persons handling tubes or in the vicinity
of exposed CRTs under vacuum must wear
safety glasses.
To ensure personal safety and the safety of co-
workers, each CE should make it a practice to
observe safety precautions at all times.
The CE must be especially aware of the danger-
ous voltages present and the
pot~ntial
hazard
presented by an unprotected cathode ray tube
(CRT); thus, the following DANG E R notice
appears here:
DANGER
12,000 Vdc. Exercise extreme caution when
working in the area of the high-voltage power
supply and CRTs. Do not remove the high-
voltage lead from the CRT following power-
off until the high voltage lead and anode
have been grounded.
All CEs should become familiar with the general
safety practices and the procedures for applying
artificial respiration that are outlined in CE
Safety Practices (Form S229-1264). In addition,
each CE should review general safety CEM No. 45
on CRT safety.
Protective Equipment
Persons handling or working with or near unpro-
tected CRTs must wear safety glasses.
Cathode Ray Tubes - Safe Handling
Cathode ray tubes contain a high vacuum and
are subject to implosion. Such an implosion can
propel flying glass, thus presenting a source of
personal injury. Therefore, when handling CRTs,
exercise extreme caution.
Transportation Handling
1.
Cathode ray tubes must be enclosed when
received, transported, or otherwise moved
from area to area. If they are shipped in
a carton, they must be in the original car-
ton or one of equivalent strength and
securely sealed to prevent accidental
opening. Also, original or equivalent
packing materials and/or forms must be
placed inside the carton to properly
support and protect the tube. If tubes
are transported in a piece of equipment,
the equipment must be able to contain
the glass fragments if an implosion occurs.
2.
Each CRT carton must be identified with
a
DANGER Cathode Ray Tube Implosion
Hazard label.
Storage
1.
Tubes must be kept in the carton or unit
except when exposure is required for
inspection or test.
2.
Adequate storage area must be provided
for all CRTs. Tubes should be stacked in
such a manner that they cannot easily be
tipped over and will not be difficult to
handle when removed from the stack. It
is recommended that the storage area be
away from the normal flow of internal
trucking and pedestrian traffic.
Testing
Personnel involved in testing CRTs must be in-
structed in the hazards involved and precautions
to be observed.
Defective CRT Disposition
No attempt should be made to repair defective
CRTs in the field. A defective CRT should be
properly packed and disposed of in accordance
with CRT disposition procedures.
Display Unit
5-5
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