Oki POS 425S - Manual (Page 90)

90 OKIPOS 425S
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5.10 Ribbon Specifications
Genuine Oki Data cartridge ribbon
Ink color: Black
Ribbon life: Approximately 3 million characters (when 1 character = 14 dots)
5.11 Reliability
1 MTBF (mean time between failures)
10,000 hours of power-on time at 25% duty cycle. Page density: 35%
2 Printhead life
200 million characters (average) in Utility Print Quality mode.
3 Printer life
5 years of power-on time at 10 hours/day, 365 days/year.
4 MTTR (mean time to repair)
15 minutes, major sub-assembly level.