Stratasys uPrint, Service Manual, Page: 20 / 383

uPrint/uPrint SE Service Manual 2-9
Actuators, Switches & Optical Sensors
The input and output signals are passed through the PDB and then processed by the
controller board. The non-motor actuators on a uPrint system are 24 volt solenoids. The 24
volt power is supplied by the PDB which in turn is controlled by the controller board. The
following is a list of actuators:
• Door solenoid – locks the door to the modeling chamber.
• Carrier latches – holds carriers in the material bays.
• Material bay solenoids – engage the motor that feeds filament from carrier to the
liquefier during auto load.
The controller board reads and updates the remaining material information on the spool e-
prom. This is accomplished through a serial interface to the material bay encryption board.
The material encryption board in turn connects to the e-prom on the carrier/spool via two
pogo pins.
The controller board monitors these switches:
• Z limit switches – upper and lower
• X end of travel (EOT) switch
• Y end of travel (ETO) switch
The controller board monitors the following optical sensors:
• X home (BOT) sensor
• Y home (BOT) sensor
• Top of modeling base sensor
Safety Devices
The controller board monitors the following safety devices:
• Chamber T/C alarm – activated for a bad or missing T/C
• Liquefier T/C alarm – activated for a bad or missing T/C
• Head and chamber “snap” switches
• Two main thermal fuses
• Door open switch
• Door latch solenoid
Controller Board Layout
Figure 2-4. Shows the layout of the controller board connectors with labels indicating where
each of the functions described previously are connected. In addition to those functions, the
figure shows a reset button, a set of dip switches, and the LEDs (D1-D3 and D6-D13).