Xerox 6100BD - Phaser Color Laser Printer, Fundamentals

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Document processing
Generic MICR Fundamentals Guide 5-11
If the document is badly damaged, or if the processing center
does not have an automated repair station, a document carrier
envelope may be used. This is a check-sized, translucent
envelope designed to fully enclose a check while adding a new
MICR clear band and encoding area at the bottom.
In most cases, processing banks do not encode the full MICR
line on transit items. Instead, they encode only the routing
number and amount information that they need in order to pass
the document on. This means that when the issuing bank
receives the repaired document, it must remove the repair strip
and repeat the repair process with all fields encoded.
The reject repair process results in the issuing bank incurring
costs for rejects on any bank’s equipment, and is a factor in any
MICR quality issues that the bank raises due to high reject rates.