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Chapter 4 - Component Installation
Chapter 4 - Component Installation
Removing the Back Case
Removing the Back Case
Discharging the CRT
Discharging the CRT
Most display manufacturers connect the major components with detachable cables
Most display manufacturers connect the major components with detachable cables
that have labeled and keyed connectors; these cables are of lengths that will
that have labeled and keyed connectors; these cables are of lengths that will
usually connect to only one place. Also, screws are identifiable by type and size,
usually connect to only one place. Also, screws are identifiable by type and size,
and usually will not fit in the wrong place. The most difficult problem with
and usually will not fit in the wrong place. The most difficult problem with
missing or wrong hardware or connections will be with single ground cables that
missing or wrong hardware or connections will be with single ground cables that
attach to obscure ground points on the metal chassis. When in doubt, make notes
attach to obscure ground points on the metal chassis. When in doubt, make notes
of the connection points.
of the connection points.
Figure 4-1, page 27, shows the typical construction of a 14-inch display. Dis-
Figure 4-1, page 27, shows the typical construction of a 14-inch display. Dis-
assembly usually starts with removal of the back case. For assistance with
assembly usually starts with removal of the back case. For assistance with
disassembly, consult your particular manufacturer's service manual. Carefully lay
disassembly, consult your particular manufacturer's service manual. Carefully lay
the display on its face on the padded work surface and remove the screws that
the display on its face on the padded work surface and remove the screws that
attach the back case to the bezel or frame.
attach the back case to the bezel or frame.
While removing the back case, note the clearance between the inside rear surface
While removing the back case, note the clearance between the inside rear surface
of the case and a small circuit board plugged into a socket on the end of the CRT.
of the case and a small circuit board plugged into a socket on the end of the CRT.
If there is not enough clearance to move the CRT and this circuit board about .25
If there is not enough clearance to move the CRT and this circuit board about .25
inch (6 mm) toward the rear of the case, you may be unable to successfully install
inch (6 mm) toward the rear of the case, you may be unable to successfully install
a touchscreen on the display and completely reinstall the back case. Contact Elo
a touchscreen on the display and completely reinstall the back case. Contact Elo
Technical Support for possible alternatives.
Technical Support for possible alternatives.
After the back case is removed, the CRT is substantially exposed. Use extreme
After the back case is removed, the CRT is substantially exposed. Use extreme
care when working around the CRT.
care when working around the CRT.
Impact or force ag
Impact o
r force against the n
ainst the neck of the
small circuit board is attached, could crack the tube, resulting in loss of vacuum
small circuit board is attached, could crack the tube, resulting in loss of vacuum
or implosion of the tube. Either result destroys the CRT. Implosion (collapse of
or implosion of the tube. Either result destroys the CRT. Implosion (collapse of
the glass inward, caused by the high vacuum inside the tube), followed by the
the glass inward, caused by the high vacuum inside the tube), followed by the
rebound of many glass pieces outward, is potentially lethal to anyone in the
rebound of many glass pieces outward, is potentially lethal to anyone in the
immediate area. Handle the CRT carefully, keep tools away from the CRT, and
immediate area. Handle the CRT carefully, keep tools away from the CRT, and
wear protective clothing including eye protection. See Safety Information,
wear protective clothing including eye protection. See Safety Information,
page 26.
page 26.
Dangerous voltag
Dangero
us voltages may be
es may be present o
very dangerous voltage even after the display has been off for days. Accidental
very dangerous voltage even after the display has been off for days. Accidental
contact with the anode lead or anode button (the small hole in the CRT glass
contact with the anode lead or anode button (the small hole in the CRT glass
where the anode lead is attached) prior to discharge may result in a potentially
where the anode lead is attached) prior to discharge may result in a potentially
lethal shock. Follow the procedure below carefully to avoid injury.
lethal shock. Follow the procedure below carefully to avoid injury.
WARNING
WARNING
eck of the CRT, or the
CRT, or the pins at the
pins at the end wher
WARNING
WARNING
present on the CRT
n the CRT anode. Th
anode. The anode m
end where the
e the
e anode may retain
ay retain a a
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Troubleshooting
