Apple color classic Manual Do Serviço

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 Adjustments
Geometry - 6
 
Vertical Size
 
Using a hex-head plastic 
adjustment tool, adjust the 
vertical height control until 
the raster height is 4.9 
inches (± 1/16 inch) or 
124.5 mm (± 1.5 mm).
Verify this height. If it is 
off, repeat the vertical size 
adjustment and, if 
necessary, the vertical 
center adjustment.
All-White Screen
Vertical Height