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5.4.2 Display Assembly
Removal and Replacement
Never remove the CRT from the assembly box
it is mounted in.
1.
Preparation for removal:
I
DANGER
12,000 Volts
a. Power down.
b. Ground both the CRT high voltage
anode and the anode wire to the frame.
This is done by grounding a screwdriver
against the display assembly box, then
inserting the tip of the screwdriver
under the protective cap and touching
the tip of the screwdriver to the anode
cap and wire
Ii
Note:
The display unit is safely grounded
only if the mounting screws
Il
are tight.
c. If the anode wire is disconnected from
the CRT, touch the shorting tool against
the anode wire connector to ground it
again.
2.
Disconnect the signal cable
11
3.
Disconnect the brightness control leads
from pins 9, 10, and 11
B
on the dis-
play PC board.
4.
Loosen the mounting screws
m .
If replace-
ment of the assembly is required, retain the
mounting screws for installation of the new
assembly.
5.
Remove the display unit from the machine.
6.
To replace, reverse the above procedure.
BR
5.4.3 Yoke Adjustment
The objective is to align and center the display
. in the viewing mirror.
I
DANGER
-
12,000 Vdc and 400 Vdc in the display unit.
1.
Power down.
2.
Ground the CRT anode
Ii
3.
Loosen the clamping screw and slide the
yoke
II
into contact with the fat part
of the CRT.
4.
Orient the yoke with the wires away from
the display PC board.
5.
Using just your fingers on the screwdriver
handle, tighten the clamping screw. Then
tighten the screw 1/8 of a turn more. The
yoke can now be rotated around the CRT
neck, but stays in any position.
6.
Turn the power on.
7.
Adjust the brightness control on the CE
control panel to get a raster that is clearly
visible but is not too bright and is not
enlarged.
8.
Rotate the yoke to straighten the display
on the viewing mirror.
Note:
The voltage on the yoke is 12 Vdc.
9.
Rotate the centering rings
m
in relation to
each other to center the display on the view-
ing mirror.
Note:
Sit in the operator's chair to observe
the display screen. The center of the view-
ing mirror can be judged only when seen
from the operator's view.
f
I
I
I
"
1.-/
CRT
Anode and anode wire
12,000 Vdc
screw
Intensity
Control On
CE Panel
Display Unit
.5-7
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