Technical information
FRONT_2.3.2 Maintenance and Installation of CRTs
1. No one shall be permitted to install, adjust, maintain, replace, or
handle high-vacuum CRTs until they have reviewed these instructions.
2. CRTs when received, transported, or otherwise moved from area to area
should be completely enclosed in their original shipping cartons and
sealed.
3. When handling CRTs, personnel must wear safety equipment at all times.
The minimum safety equipment required is:
a. Safety glasses -- IBM part number 5715010.
b. Long-sleeved garment.
4. CRTs under vacuum will not be permitted to remain out of their cartons
unless they are under test or inspection.
5. Do not scratch or bump any part of the CRT because this may weaken the
glass and cause it to implode.
6. Before removing any CRT, discharge all stored potential that may exist
on the CRTs anode button or base socket pins and the capacitor in the
high-voltage supply. The procedures for discharging CRTs are
explained in "High Voltage Discharge Procedure" as part of the steps
in removal and replacement.
Note: Some CRTs contain a conductive coating on both the inside and
outside surfaces to form a capacitor. Within some CRTs, a second
capacitive charge builds up following the original discharge. It is
therefore important to discharge each CRT a second time immediately
before removal.
7. Do not handle CRTs by the neck alone. The neck is the weakest part of
the CRT and is easily broken. Always handle CRTs with two hands. If
the CRT is shipped with a lifting strap, use this strap for removing a
CRT from, and placing a CRT into, the shipping container.
8. When CRTs are inserted or removed from equipment, they must be
supported by the large end while carefully guiding the neck in or out
of position. The lifting strap, if available, can be used in this
process.
9. Do not place the CRT on a table or bench when there is any possibility
of the CRT rolling. If it is necessary to place a CRT anywhere except
in its special carton, a piece of felt or other soft material should
be placed under it to prevent scratching the glass. Place larger CRTs
vertically on their faces, and not on their sides, to prevent the
possibility of rolling.
10. When a CRT is removed from equipment, it should be enclosed in its
shipping container as soon as possible to reduce the chances of
breaking. Cathode ray tubes should each be placed in their cartons
with the large face end up and the neck down. Ensure that the weight
of the CRT is not resting on the neck. The container should be sealed
securely with strong tape and, to prevent tipping, turned over so the
CRT is positioned face down.
PS/2 Displays Maintenance Manual
Maintenance and Installation of CRTs
¦ Copyright IBM Corp. 1993
FRONT_2.3.2 - 1