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Brother HL-1440 Service Manual page 139

Service manual
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4.
MTBF / MTTR
The meantime between failure (MTBF) and the meantime to repair (MTTR) for this printer are
as follows;
MTBF: Up to 4,000 hours
MTTR: Average 30 minutes
5-7
CHAPTER 5 PERIODIC MAINTENANCE
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This manual is also suitable for:

Hl-1230Hl-1450Hl-1470n

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