Apple Macintosh Performa 577 - Manual (Page 153)

Adjustments Geometric Distortion - 32
±
Warning:
The entire yoke
assembly has very high
voltage. To prevent
electrical shock, do not
touch the yoke assembly, the
anode wire, or the yoke
wires.
3 To determine which
control to adjust,
compare the display with
the distortions shown.
4 Using a hex-head plastic
adjustment tool, adjust
the control (see next
page for control
locations).
Horizontal Bow
Pin Phase
Vertical Angle