Xerox 6100BD - Phaser Color Laser Printer, Fundamentals

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Quality control
6-14 Generic MICR Fundamentals Guide
Figure 6-10. Examples of voids
Extraneous ink spots
Extraneous ink spots are unwanted bits of ink that result from
unavoidable splatter and smear of the magnetic printing inks.
These spots, which may be invisible to the unaided eye, can
affect the wave patterns of MICR characters, depending upon
their size, quantity, and position.
According to ANSI standards, any number of spots may be
present within the clear band, if they are contained in a 0.003 by
0.003 inch/0.08 by 0.08 mm square. Random spots that are
contained within a 0.004 by 0.004 inch/0.10 by 0.10 mm square
are also permissible, but they are limited to one spot per
character space and no more than five in any one field.
There is one exception to this rule. On the back side of the page,
any number of spots can be present within the clear band area, if
they do not exceed a 0.006 by 0.006 inch/0.15 by 0.15 mm
square.
Single voids
Not acceptable
Acceptable
Trail edge deletion (Note: This depends on the check printing orientation.)