Brother HL-5040 - Mtbf; Mttr

HL-5030/5040/5050/5070N SERVICE MANUAL
5-17
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 except the periodical maintenance parts (the Paper Feeding Kit)
and the printer control boards whose MTTR is average 10 minutes.