Maintenance Manual SP 40
Rev. 005
12
Chapter 1
General
1.7 Maintaining Parameters
MTTR
The Mean Time To Repair is the estimated mean time to repair the printer at Optimum Replaceable Unit (ORU)
level.
For this printer the MTTR is 16 minute and includes:
- Identifying the faulty ORU
- Changing the ORU
- Cleaning
- Testing
MTBF / RELIABILITY
Mean Time Between Failure depends on duty cycle rate (D.C.).
For this printer the MTBF is 10.000 hours @ 25% D.C. (excluding print head).
Duty Cycle rate estimated for this printer is calculated as follows:
Paper Movement & Print Time
Duty Cycle = ------------------------------------------------- = 25%
Power on Time
Reference usage of 25% duty cycle is assumed on the basis of the following parameters:
60% column density, 50% line density, 40% character density, 40 hours at week.
LIFE
Unit 5 years
Print Head 400 M Characters (Draft Mode)
Ribbon 4 M Characters (Draft Mode)
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