Epson TM-U590/U590P Operator's Manual page 47

MICR reader
mechanism (only
when the printer is
used with the MICR
reader):
MTBF:
MCBF:
240,000 passes
The MICR reader is defined to have
reached the end of its life when it reaches
the beginning of the Wearout Period.
180,000 hours
Failure is defined as Random Failure
occurring at the time of the Random
Failure Period.
29,000,000 lines
This is an average failure interval based on
failures relating to wearout and random
failures up to the life of 12 million lines.
Reference Information 4-9