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Functional Overview
10-7
HP DesignJet CP Series Printers
Stepper Motors
Three six pin connectors connect three stepper motors on the left hand side
to the refill interconnect PCA:
D The Bail stepper motor lifts the bail assembly during paper loading
D During printhead refill the Elevator stepper motor moves the elevator
assembly up and down.
D The Refill stepper motor moves the refill assembly to engage the valves.
Three six pin connectors connect three stepper motors on the right hand
side to the service station interconnect PCA:
D Two stepper motors move the service station forward and backward and
up and down.
D The primer stepper motor drives the primer assembly.
Sensors
Line Sensor
The line sensor is located on the carriage assembly. The functions of the line
sensor are:
D Detect and measure lines when performing the accuracy calibration.
D Detect and measure lines when performing the printhead alignment.
D Detect the media width and skew during media loading.
D Detect the position of the drive roller by reading a mark located on the
side of the drive roller.
D Checks each nozzle is operating correctly.
D Detect the amount of ink that a printhead has to spit in order to reach
the reference colour.
D Performs the X-axis calibration
Other sensors located on the carriage PCA are the temperature and
humidity sensors and the encoder strip sensor.
Cover Sensors
There are two mechanical sensors located on the right hand cover. These
sense the opening and closing of the right hand cover door and the window.
They are connected to the control panel, information is then relayed to the
main PCA in electronics enclosure.
The left hand cover door sensor is mounted on the side plate. It is connected
to the refill interconnect PCA, information is then relayed to the main PCA
in the electronics module.