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If the screen is blank, fill it with characters and
adjust the horizontal width coil (LI01, Figure
5.2) for Sy? inches (21.6 cm) from the left margin
to the right margin of the display characters.
The horizontal linearity is adjusted to correct for
the compression of the display on the left hand
side of the screen. To correct this, loosen the
clamp securing the yoke and slide the cardboard
sleeve in or out to give uniform width to the
characters on the right and left borders of the
display.
Adjust the focus control (R 107, Figure 5-2) for
best overall display focus. It may be necessary to
readjust the contrast control and repeat this step.
Centering of the display is accomplished by rota
ting the small permanent magnets glued behind
the deflection yoke. Magnets should be removed
and reglued with silicone adhesive. If the display
as a whole is tilted, correction may be accomplish
ed by rotating the entire yoke.
Additional descriptions and adjustments can be
found in Appendix A.
5.5
DISASSEMBLY PROCEDURE B100
The 8100 disassembles Into replacable components:
The Keyboard, Monitor Assembly, Logic Board,
and Fan. All Major components can be removed
and replaced quickly. An accompanying diagram
Figure 5-3, shows major assembly sections and
their interrelation. The following explanations
relate to this diagram.
5.5.1
Case Removal
The reinforced fiber case Is one piece and Is fasten
ed to the chassis with six screws and lock washers.
The screws are located: Two on the front of the
case below the keyboard, and four screws In the
back of the case surrounding the black rear panel.
Lift the case straight up for removal.
Assemble in the reverse order.
5.5.2
Logic Board Removal
Place the terminal in an upside down position
on a soft surface to avoid damage. Remove the
5-18
(5) screws and lock washers that secure the
Bottom Plate to the chassis. The Logic Board is
attached to the Bottom Plate with plastic clips
(see Point A, Figure 5-3).
CAUTION:
Do not remove the screws holding
the keyboard.
Carefully lift the Bottom Plate/Logic Board and
notice that there are three wiring harness attach
ment points: One for the keyboard at the front
of the Logic Board (see Point B, Figure 5-3), and
two for the power supply/monitor electronics at
the left rear (if the terminal is viewed from the
bottom) of the Logic Board (see Point C, Figure
5-3). Carefully remove the keyboard strap and
lift the front of the board so that the other plugs
can be removed. The rear plugs have a plastic
spring clip type connector that must be compressed
before removal. The board should be pulled forward
to clear the switches and plugs from their holes in
the rear of the chassis and the board can then be re
moved.
Assemble in the reverse order.
5.5.3
Keyboard Assembly
Remove the case as described above. Remove the
(7) screws and lock washers, (see Point E, Figure 5-3)
from the underneath side of the chassis on the Key
board end. Move the keyboard away from the moni
tor slightly and unplug the wire strap from the logic
board to the Keyboard (see Point F, Figure 5-3).
Remove the Keyboard.
Assemble in the reverse order.
5.5.4
Fan Removal
The Fan is removed by first removing the case (see
above) and removing the four mounting screws at
the back of the terminal (see Point G, Figure 5-3).
Unhook the power cord and remove.
Assemble In the reverse order.
5.5.5
Monitor Assembly Removal
The bottom plate/logic board and case should be re
moved first (see above). Three screws and Ipck was
hers (see Point D, Figure 5.3)) hold the Monitor
Assembly to the chassis. Remove the screws from
the underside of the chassis. The complete Monitor
Assembly can then be removed.
Assemble in the reverse order.
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