Xerox ColorQube 9303 Series Service Manual page 1765

Low Pressure Reservoir
The low pressure reservoir is a thermally conductive part with four chambers, each of which
has four outlets at the bottom for a total of sixteen outlets. Ink travels out at the bottom of the
chamber, and each outlet orifice also houses a disk valve. A wire mesh filter is placed inside of
each low pressure chamber to remove contaminants.
High Pressure Reservoir
The high pressure reservoir is a thermally conductive part with sixteen chambers, four per
color. Features in the dividing walls of the chamber act to stop the disk valve in its open posi-
tion. Upon actuation, pressurized air enters the opening at the top of the chamber, and ink is
forced against the disk valve, which causes it to close and directs the ink through an exit path
opposite the disk valve.
Normally Open Disk Valve
The normally open disk valve is 7 mm in diameter. The contact seat is an 'O' shaped flat
around the outlet orifice of the low pressure ink reservoir.
Figure 17 Check valves
ColorQube® 9303 Family
Figure 17.
February 2013
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Ink Reservoir Heater
Figure 18. Sandwiched between the manifold plate and the high pressure reservoir, the reser-
voir heater maintains the set point temperature. The ink reservoir is brought to and maintained
at temperature by two rod type AC heaters which are thermally protected from overheat.
Figure 18 Ink reservoir heaters
Manifold Plate
The manifold plate routes ink from the 16 high pressure reservoir chamber outlets to the umbil-
icals. The manifold plate channels the ink into four rows, each row containing CYMK. Each
channel has an outlet, which passes through a small boss on the other side of the plate. This
boss acts as a seat for a normally-closed check valve.
Umbilical Connector Plate
The connector plate completes ink routing to the umbilicals. The start of each ink channel
houses a spring and provides a recess for the normally closed check valve. The outlet of each
channel is a through hole where the tube fitting will be pressed in.
Normally Closed Check Valves
The normally closed check valves press against the top of the boss on the manifold using a
spring that acts on the metal side. The pressure applied to the high pressure ink reservoir in
order to deliver ink will act to overcome the spring force and open the valve.
Ink Level Sense
Ink level detection, Figure 19 is provided by one of two capacitive sensor assemblies. Each
assembly has two capacitive sensor probes that sit in the low pressure reservoir and monitor
ink level for two colors (1 probe in each ink reservoir). One set monitors the black and yellow
while the other set monitors magenta and cyan.
Principles of Operation