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Z- Probe Reading is 75 Not 950... help!

Posted by gregstah

gregstah

Z- Probe Reading is 75 Not 950... help!
January 05, 2014 08:40AM

Registered: 10 years ago
Posts: 26

My Z-Probe seemed to be working just fine, now it is giving me a reading of 75 instead of 950 as dictated by the documentation. Needless to say I don't know what to do because if I carry on regardless it just does not work.

When trying to run a print the hotend ends up nearly 2mm off the bed which obviously is a problem.

Any suggestions?

I have:

Checked the polarity of the plug to make sure it is correct
Re done the Axis compensation to make sure I'm not doing something wrong
Made sure there is no incandescent lighting on that could affect the readings of the Z-probe

Edited 1 time(s). Last edit at 01/05/2014 09:06AM by gregstah.

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tim_h

Re: Z- Probe Reading is 75 Not 950... help!
January 05, 2014 09:28AM

Registered: 10 years ago
Posts: 59

Has the blue wire disconnected from the duet board?

RS Ormerod #472

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dc42

Re: Z- Probe Reading is 75 Not 950... help!
January 05, 2014 11:37AM

Registered: 10 years ago
Posts: 14,672

If you have a DMM, you can check the voltage across the sensor pins at the bottom of the board. There should be nearly 3.3V between the leftmost pair of pins, falling to 1V or even less when the sensor is close to a reflecting surface. There should be a constant voltage of about 1.2V between the rightmost pair of pins.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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gregstah

Re: Z- Probe Reading is 75 Not 950... help!
January 05, 2014 05:05PM

Registered: 10 years ago
Posts: 26

Managed to sort it out, there was some debris on the sensor... I didn't even think to check for that.

G