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Functional Overview
10-8
HP DesignJet 5000 Series Printers Service Manual
Air Pressurization System (APS)
The APS is the system that provides and controls the pressurization
of the ink in the Ink Cartridges and is located under the ISS. The key
purpose of this system is to ensure the minimum required ink
pressure at the inlet to each Printhead respectively at the required
print rates. The APS is also used to provide pressure for tube purge
and as part of the blow prime system operation.
The APS pressurizes the ink in the Ink Cartridge bags by
pressurizing the air around them. The Printer controls the air
pressure using the pump with feedback from the sensor; when
required the valve is opened to depressurize the air circuit. This
allows control of the ink pressure at the inlet to the Printheads.
Leak Detect System (LDS)
The purpose of the Leak Detect System (LDS) is to detect the
breakage of any of the Tubes that deliver ink from the Ink
Cartridges to the Printheads.
If a Tube breaks, as the system is pressurized, the ink flows through
the breakage and gets between the Tube and the Tube Carrier, and is
forced to go to the Ink Leak Detector where the leaking ink is
collected. There will be a potential short circuit between the two
metallic pins, and the ink leak will be detected.
Air Tube to Air
Connector and Ink
Cartridges
Cables to ISS PCA
DC motor-driven
air pump
Analog pressure
sensor
Two-way solenoid valve