CARRIAGE UNIT
SM 6-11 J001/J003
Detailed
Descriptions
6.3.6 INK OUT
Two sensor pins [A.] monitor air in the print head tank. These pins detect changes
in the voltage differential on the surface of the ink inside the print head tank.
When these terminals detect air in the tank:
• The air release solenoid [B] energizes and opens the air release valve [C] so air
can escape from the ink reservoir.
• This allows more ink to enter the tank.
This is a continuous operation. The sensor pin reading signals the ink-out condition
when:
• The ink near-end alert has been issued.
• The amount of air detected in the tank indicates that no ink remains in the tank.
Also, as a backup measure, the firmware counts up for the amount of ink
consumed after every near end occurrence. When this count reaches the value
prescribed for the ink cartridge, this will also signal an ink-out condition.
G707D912.BMP
G707D913.BMP
[A] [C]
[B]
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