Checking Straightness, Pincushioning, Centering, And Vertical Linearity - Wyse WY-120 Maintenance Manual

A-4
Checking Straightness and
Pincushioning
Display Inspection with the Reticle
To check straightness and pincushioning, follow these steps:
1 Move the reticle along a horizontal edge of the bezel. Check
the right vertical edge, then the left vertical edge against the
straightness lines etched on the perimeter of the reticle (see
Figure A-3).
Figure A-3 Checking Straightness,
Pincushioning, Centering, and
Reticle
Vertical Linearity
!41-- The dis play must be within
these lines on all corners
Look for 6 1 /2 rows of characters
between each of these lines
(see specification for tolerances)
'
t
t
t
t
Display
Bezel
2 Move the reticle along a vertical edge of the bezel. Check the
top edge, then the bottom edge against the straightness lines
etched on the perimeter of the reticle.
3 Position the upper right corner of the display between the
etched markings on the upper right corner of the reticle. The
display corner edge should fall within the sci:ibed markings on
the corner of the reticle.
4 Repeat the same procedure for the other corners of the
display.
5 If an edge or corner doesn't fall within the markings, adjust
the display (see Section 3).