Epson PC AX Technical Manual page 235

HEV.A
DIAGRAMS AND REFERENCE MATERIALS
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: Error code
=
508 :
: SCREEN P AGING ERROR
l
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8) Light P en Check
When the light pen check is selected, you must next specify
whether or not to actually perform the check.
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: LIGHT P EN CHECK
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: Enter Y to start light pen check. :
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Enter N to return to the menu. :
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Next, a white block is displayed on the the screen, so press
the light pen on the center of each block. The address that is
read from light pen is checked.
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+---+
: c
i
+---+
+---+
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b
i
+---+
+---+
: a :
+---+
PLACE LIGHT PEN ON CENTER OF WHITE BLOCK
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Check the three blocks in the order of a - b - c.
The program displays an error message if the position where the
block is displayed and the light pen position do not match.
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