Reliability; Environmental Conditions - Epson U220B - TM Two-color Dot-matrix Printer Technical Reference Manual

1.6.2 Reliability

Life:
MTBF:
MCBF:
Print head life:
Autocutter life:

1.6.3 Environmental Conditions

Temperature:
Humidity:
Rev. D
Mechanism: 7,500,000 lines
180,000 hours
Failure is defined as a Random Failure occurring at the time
of the Random Failure Period.
18,000,000 lines
This is an average failure interval based on failures relating to
Wearout and Random Failures up to the life of 7.5 million
lines.
150 million characters (using an average of 2 dots/wire per
character). (The printing pattern is EPSON test pattern).
800,000 cuts
End of life is defined as the point at which the printer reaches
the beginning of the wearout period.
During operation: 0 C to 50 C {41 F to 122 F}.
(At 34 C {93 F} or higher, there are humidity restrictions as
listed below. )
During operation:10 to 90% (no condensation)
During storage:10 to 90% (no condensation; excludes paper
and ribbon)
Operating temperature and humidity range
TM-U220 Technical Reference Guide
General Information 1-15