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10. Reconnect the monitor power and signal ca-
bles(see Figure 1-2).
11. Use the PLATO Diagnostic disk in the computer
to display the PLATO Touch Grid.
12. Check for alignment between the plastic grid and
the display. Rotational and off-square misalign-
ment must be mechanically corrected which may
require removing the plastic holder (162) to allow
access to the stud bolts (164).
13. Touch squares and check for proper response.
(See Touch Control Alignment and Checkout in
the Servicing chapter.)
NOTE:
Failure of the touch control to respond to touch-
ing squares in the outside rows is an indication of ex-
treme misalignment. Resetting of horizontal centering,
vertical centering, height, and width may be necessary.
This failure may also be caused by misalignment be-
tween an LED board and its collector plate. The design
of the rigid plastic holder (162) with its positive
mechanical mounting for the LED boards and collector
plates, reduces the frequency of these misalignments.
14. Remove the plastic grid and install the cabinet
front.
15. Check for horizontal accuracy while touching
squares with a 0.3 inch device. If there is a re-
sponse to the squares to the right or left of the
square touched, adjust horizontal centering and
width for better accuracy.
NOTE:
It is acceptable for adjacent squares to be acti-
vated when a square is touched after final video align-
ment.
16. Check for vertical accuracy while touching squares
with a 0.3 inch device. If there is a response to
squares above or below the square touched, ad-
just vertical centering and vertical height for better
accuracy.
Page
5-4
Logic Board (65)
1. Remove the back cover (10) and the top cover
(20).
2.
Unplug the video output board from the CRT.
3.
Disconnect all cables from the logic board except
J3 and J4 detector cables.
4.
Remove the two screws (178) which secure the
board stand-ofts (173) to the right chassis CRT
mounting plate (151).
5.
Push the plastic board support (174) toward the
board and out of the hole in the right chassis CRT
mounting plate.
6.
Remove the two screws (35) which secure the
input panel assembly (40) to the right chassis CRT
mounting plate.
7.
Remove the four stand-ofts (175) which secure the
DTE and video input connectors to the input panel.
8.
Remove the two screws (176) which secure the
logic board to the input panel.
9.
Move the logic board toward the center of the mon-
itor until it is beyond the transformer (177) and
then bring it toward the rear to allow access to
the detector connectors J3 and J4.
10. Carefully peal back the copper foil to expose con-
nectors J3 and J4.
11. Disconnect the cable connectors J3 and J4 and
remove the logic board from the monitor.
NOTE:
The detector cables can be interchanged at
the logic board connectors J3 and J4 as these connec-
tors are wired in parallel on the board.
Disassembly/Reassembly
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