Epson TM-U590 Operator's Manual page 50

Reliability
Life (when printing
alphanumeric
characters):
MICR reader
mechanism (only
when printer is used
with MICR reader):
MTBF:
MCBF:
Mechanism:
Print head:
The printer is defined to have reached the
end of its life when it reaches the
beginning of the Wearout Period.
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.
12,000,000 lines
200 million characters
(when printing Font B)
Reference Information 4-9