Tip from GB: Note: Before beginning the following adjustment procedures, set the
customer picture, sharpness, brightness, and tint controls to midrange and the customer
color control to minimum.
Remove the back cover of the set and the light shield, then turn the set
on and inject an NTSC crosshatch pattern signal into the antenna terminal.
Note: The crosshatch pattern will appear clearer if the front of the screen is
covered with a dark cloth.
Cover two of the CRT output lenses with cardboard pieces (or other
non-conductive opaque material) to observe the magnified reflection of the other picture
tube on the backside of the viewing screen.
Adjust the CRT’s focus control (located on the Screen/Focus Control
Block) for the sharpest raster image.
Confirm correct focus by viewing the screen from the front of the set.
Repeat steps two through four to adjust the focus of the two remaining
CRTs.
Note: Before beginning the following adjustment procedures, set the customer picture,
sharpness, brightness, and tint controls to midrange and the customer color control to
minimum.
