Encoder Reference Marks Not Detected

This article is for Pre 2020 Machines

When the encoder reference marks are not detected, InSpec Classic displays the following error:

InSpec Classic Error

This error is usually a defective linear encoder. If replacing the linear encoder does not solve the problem, please proceed to troubleshoot the breakout PCB, Axis Cable, and Logic PCB to determine the faulty component.

This test requires access to Alpha Tune. To open Alpha Tune go to the PC’s C drive, Program Files/MicroVu Corp/InSpecforWindows.

Testing Axis Cable:

Switch both X and Z axis cables at the Logic PCB and on the X and Z breakout PCBs.
With the E-Stop engaged turn on the machine and enter Alpha-Tune and select Axis 3.
Push the Z-axis past the index mark and verify if the index mark reports.

If the index mark reports, then the Z-axis cable is defective and should be replaced.
(This can be rechecked by testing the X-axis index mark)

If the index mark does not report, then proceed to test the Axis Breakout PCB.

Testing Axis Breakout PCB:

Switch both X and Z axis Breakout PCBs.
With the E-Stop engaged turn on the machine and enter Alpha-Tune and select Axis 3.
Push the Z-axis past the index mark.

If the index mark reports, then the breakout board is defective.
(This can be confirmed by testing the X-axis index mark)

If the index mark does not report, then proceed to test the Logic Board.

Testing the Logic Board:

With the machine off swap the X and Z axis cables from the logic PCB.
With the E-Stop engaged turn on the machine and enter Alpha-Tune and select Axis 3.
Push the X-axis past the index mark,.

If the index mark reports, then the logic board is working correctly, and the issue is either the encoder, breakout PCB or cable.

If the index mark does not report, then proceed to replace the Logic PCB.