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3-8
3.5 Reliability
MTBF: 8,000 hours using a 25% duty cycle, 25% page density, and three hours of power-on
operation per day.
MTTR: 0.5 hours
Printer service life: 5 million lines or 5 years
Consumables Print head 300 million strokes for each wire (90% confidence level)
This corresponds to about 110 million characters for draft quality or 70
million characters for letter quality.
Ribbon 5.0 million characters for draft quality (black ribbon cartridge)
3.6 Protection and Restrictions
3.6.1 Protection
To protect the print head, controller, and power supply, the printer checks for the following conditions:
• High temperature of the print head
• Damage to the carriage motor driver and the line feed motor driver or a short circuit in the motors
• Overvoltage of +34 V
To ensure printing quality, the 24 dot wires of the print head are divided into three groups and 3-pass
unidirectional printing is done when one of the following overload conditions is detected:
• +34 V power falls below the predetermined voltage.
• The print head’s thermal sensor detects a high temperature.
• Image data has a dot density higher than the prescribed printing duty.
Note:
No overload condition occurs when the printing load is smaller than printing 66 lines at 33% duty.