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E l o E n t u i t i v e T o u c h m o n i t o r
Spacing the CRT from the Bezel
The last part of the touchscreen mounting procedure is to determine the
appropriate spacing of the CRT from the bezel, (with the touchscreen attached),
and to reinstall the CRT with the required spacers in place (refer to, Figure 4.1
on page 4-33.) Do not clamp the touchscreen between the bezel and the CRT
without proper spacers as breakage will almost certainly occur. The nominal
thickness of the touchscreen and the two layers of adhesive tape is 3/16-inch
(5 mm). If your installation has a 1/8-inch (3 mm) touchscreen-to-bezel gap,
5/16-inch spacers would be required. If the touchscreen is to be in contact with
the bezel, 3/16-inch (5 mm) nominal spacers would be required.
Because the original CRT face-to-bezel mount is often an interference fit, with
the bezel shape altered slightly to draw it up tightly against the CRT, you should
start with a 1/16-inch (2 mm) thicker spacer than the nominal dimension above.
Two thicknesses of spacers, plus additional washers to use as shims, are
available in the Touchscreen Installation Kit (458095-000).
During the spacer selection process, you may have to install the CRT with the
touchscreen attached in the bezel several times. To prevent the CRT from
dislodging the spacers, temporarily insert plastic tie wraps or toothpicks as
guides in the mounting post holes. After selecting the correct spacers, discard
the guides and fix the spacers more securely in place with the adhesive
"doughnuts" provided in the Touchscreen Installation Kit.
When spacers for the desired gap have been selected, install the CRT. Make
sure you have previously reinstalled the degaussing coil. Select a screw that is
long enough to compensate for the spacer thickness (provides at least three full
turns into the mounting post threads) but not so long as to penetrate the surface
of the bezel. Over-tightening the screws may strip or split the mounting posts.
After the screws have been tightened snugly, examine the clearance between the
bezel and touchscreen. Try to adjust for the clearances suggested unless the
available space is insufficient.
If you are trying for zero clearance between the touchscreen and the monitor
(using a wider inactive region touchscreen), the above process should still be
generally followed. Do not clamp the touchscreen between the bezel and the
CRT with no spacers as breakage will almost certainly occur.
Evaluate the bezel to touchscreen fit carefully. Before selecting spacers, check
the fit by placing the bezel over the touchscreen/CRT combination (using the
plastic waste bucket to hold the CRT), or gently setting the touchscreen/CRT
combination on top of the inverted bezel on the workbench. Look for reasonably
even fit. If the bezel in its relaxed state has a different curvature than the
touchscreen, this method may not work, and you may want to complete the
installation with a gap between the touchscreen and bezel as described earlier.
Содержание AccuTouch 821615-000
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