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BJC-2000
5.5 Head Temperature Sensor
The head temperature sensor in the print head is a diode sensor which detects the
head's internal temperature. Temperature changes in the head are detected by the
MPU as voltage-level changes.
The analog value input to the MPU is converted into a digital value by the A-D
converter. This digital value is used for stopping dot ejection if there is an abnormal
temperature increase.
5.6 Waste Ink Amount Detection
Waste ink is discharged during head maintenance and absorbed by the waste ink
absorber.
If the amount of waste ink discharged exceeds the absorption capacity of the waste ink
absorber, ink might leak from the printer.
To prevent ink from leaking, the waste ink absorber capacity is estimated and detected
when full.
The waste ink is discharged during maintenance jet and cleaning. The amount of
waste ink discharged is estimated by counting the number of maintenance jet and
cleaning operations. Then the waste ink amount is calculated taking into consideration
the amount of evaporated ink. When the calculated waste ink amount exceeds the
capacity of the waste ink absorber, a waste ink-full error occurs.
Sensor Function
Paper detection
Paper width detection
Home position detection
Cartridge detection
Ink cartridge detection
Cartridge identification
Waste ink amount detection
TABLE 4-4 LIST OF SENSOR FUNCTIONS
Detected by the paper sensor
Detected by the home position sensor
Detected by the head rank resistance and
head temperature sensor
Identified by the head's ID0, ID1 and INKS2
Calculated with the maintenance jet dot count
4-29
Part 4: Technical Reference
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