We have a Phaser 4510 and when printing two underscore characters it prints as a solid line. When printing the same document on the Pahser 4622 there is a small gap between the underscore which creates a problem with Optiocal Mark Recognition.
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Can you confirm which result is the desired one?
Is the space correct?
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Typically that is a font issue, not a device issue, try changing the driver font setting to this in Start>Devices and printers then right click the printer and choose "Printing preferences"