Laser Printer SERVICE MANUAL HL-1030, 1240, 1250, 1270N

CHAPTER 5 PERIODIC MAINTENANCE
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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