Reliability Specifications; Mpbf (Mean Prints Between Failures); Mttr (Mean Time To Repair); Printer Life - Oki B6500 Service Manual

7. Reliability Specifications

The print engine shall meet the following specifications.
:
1. A single sheet shall be defined as two (2) impressions in the duplex mode.
2. Paper shall be flipped over if the feeding performance does not meet with face side.

7.1 MPBF (Mean Prints Between Failures)

MPBF: 300,000 impressions.
MPBF includes all input and output options. For the purpose of MPBF calculations the definition of
"failure" shall be any failure where the print engine does not meet the performance specification.
This value does not include use induced errors. The following failures shall be excluded from failure
count for MPBF.
1. Caused by operation or installation which does not conform to the instructions.
2. Caused by the use of media that is outside of the stated specification limits as represented by the
Baseline, Standard paper and Special Media list.
3. Caused by operation outside the conditions defined in this specification.
4. Caused by use of parts which have gone beyond their stated life.
5. Recoverable failure following replacement of a toner cartridge.
6. Caused by a service engineer error or an error in their instructions.
7. Caused by premature failure (including transportation damage, mfg. defect, improper handling).
8. Caused by ESS controller and MCU firmware conflicts.

7.2 MTTR (Mean Time To Repair)

Average MTTR is expected to be within 15 minutes. 95% of the total repair jobs can be finished within
30 minutes. Failure diagnosis time shall not be included.
: These values are applied to an unpacked engine, not for an engine in a box. These values
are for repairs performed by a trained service engineer.

7.3 Printer Life

7.3.1 Print Engine Life

The print engine life shall be 1,000,000 impressions (Letter SEF) or 5 years from the time the
printer is installed (whichever comes first).

7.3.2 Paper Deck Life

The paper deck life shall conform to the print engine life (Section 7.3.1)
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Chapter 8 Printer Specifications