Open Hardware
Assembly Instructions

1x- [PP-GP0435] Flexy LCD Knob
2x- [HD-MS0336] Black Adhesive-Back Bumper, Square
1x- Control Box Assembly - untested
1x- Control Box Test Stand

Place the flashed unit to be tested to the left of the Control Box Test Stand

  | Extruder  
  |  
  | X motor  
  | X Min  
  |   
  | Bed Thermistor  
  | Bed Ground  
  | Bed Power  
  |  
  | Z max  
  | Z left motor  
  | Y Motor    
  | Y Endstop  
  | Z right motor    
  | Ground

Connect all of the external connectors of the Control Box to the Control Box Test Stand:
Extruder Connector – 20 pin Molex Microfit connector
Z Motors – JST connectors; one short one long from bottom of interconnect
X Motor – JST connector; second harness exiting from top of interconnect
X Endstop - 2 purple Quick Connects at the end of the X Harness
Y Motor – JST connector; middle length of 3 cables at bottom of interconnect
Y Endstop - 3 pin connector at end of Y Motor Harness
Bed Power – Anderson connector
Bed Ground – 3 pin Molex SL connector
Bed Thermistor – 2 pin Molex SL connector
Z Max – 2 pin Molex SL connector located at interconnect housing
Ground - clip gator clip to Hi-Pot testing screw at bottom of interconnect housing

Begin by powering on the connected unit to be tested and the Control Box Test Stand

The following checks must be performed BEFORE starting the test gcode:
1. Check thermistor values:
Hot End 1 should read 211C
Hot End 2 should read 190C
If the values listed above are reversed or no value is shown (0) the unit has failed testing and must be reworked. In this case, the two thermistor connectors inside the unit are connected incorrectly. Return the unit to an ESD safe work area, remove the Electronics Cover, and verify correct connector locations. See Pinout Diagram
2. Check bed thermistor value:
Should read close to room temperature in degrees C, if no value is shown, verify external connection before returning the unit to an ESD safe work area for rework.
3. Check 5v Heat Sink Fan:
The heat sink fan (labeled 5v and located on bottom panel of CB Test Stand) should be spinning any time the unit is powered on. If either of these fans is not functioning the unit has failed the test and must be reworked. After returning the unit to an ESD Safe work area and removing the cover, verify the tool head power connector is pinned correctly and properly connected. See Pinout Diagram
4. Case Fan: Verify that the case fan is blowing air OUT from the rear of the case. A sticky note or other small piece of paper may be used to verify direction of flow.

After selecting “Print” the unit will begin the test gcode by homing the X axis, the motor should begin by spinning counter-clockwise.
Press and release the X-Min button on the left of the CB Test Stand to trigger the endstop. The X Motor should now slowly turn clockwise

Failure conditions:
If the X Motor moves clockwise first, the motor is wired incorrectly.
If the motor fails to move at all, check external connections first.
If the X Motor jiggles or twitches, this is indicative of poor connection on one of the individual wires of the motor lead.

In the event that the above failures occur and are not rectified by checking connections, return the unit to an ESD Safe work space for diagnosis and repair.

The Z Motors will now begin moving simultaneously, the left one turning counter-clockwise and the right turning clockwise.

Press and release the Z-Max button on the left side of the CB Test Stand This emulates the Z Max switch on the printer.
The motors should now spin the opposite direction.

Failure conditions:
If the Z Left Motor moves clockwise first, the motor is wired incorrectly.
If the Z Right motor moves counter-clockwise first, the motor is wired incorrectly.
If the motor fails to move at all, check external connections first.
If the Z Motors jiggle or twitch, this is indicative of poor connection on one of the individual wires of the motor leads.

In the event that the above failures occur and are not rectified by checking connections, return the unit to an ESD Safe work space for diagnosis and repair.

Immediately following actuation of the probe button, the E1 Motor on the test stand should begin moving counter-clockwise.
If the motor moved clockwise first or failed to move it is not wired correctly and the unit has failed the test.
To confirm the motor moved counter-clockwise and proceed with the test, press the PROBE button.

The motor will now spin clockwise.
To confirm and proceed with the test press the PROBE button.

The 24v fan on the CB Test Stand should now be spinning at 40%, it will then speed up to 100%
If the fan doesn’t turn on, the unit has failed the test. Check external connections to the CB Test Stand before returning the unit to an ESD Safe work area for diagnosis and rework.

The fan on the right panel of the CB Test Stand labeled ”H-E2” should now turn on.
If the fan did not turn on the unit has failed the test and should be returned to an ESD Safe workspace for diagnosis and repair.

Ensure the assembly is connected to a workstation computer via USB and powered on.

Make sure "TAZ Workhorse | HE | 0.5mm" is selected from the list of printers. Add it if needed.
From the top menu bar select settings > printer > manage printers
From the menu, select "Upgrade Firmware" From the resulting dialogue, select "Upload custom firmware".
Navigate to and select "Marlin_TAZWorkhorse_HardenedExtruder_2.0.0.144_aded3b617.hex" then select "Open"
Once CuraLE has finished writing the firmware to the RAMBo, all open dialogues can be closed.
Power off and disconnect the unit from all connections.