Z axis and LCD stopped working.

Mostly Printed CNC - MPCNC Advice
1

I built the MPCNC and have had it running for a month or so. Was doing some testing yesterday trying to find the best bit to engrave a piece of aluminum. After several successful runs the machine stopped and LCD went dark. I can still move the x and y with gcode, but the z axis is dead ( LCD is too. but I’ve disconnected that ) . Z axis motor is fine, tested it with one of the working axis drivers. I’m wondering if that was a heat problem with the mini rambo board ? Before I buy another board, do you think that was the problem board overheated ? I’ll put a fan on it this time.

2

Did you check the fuses? If you’re not using the extruder stepper driver, you can, by updating the firmware, swap the z-axis for the extruder driver instead of buying another board.

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3

Did you get metal chips on it?

Once a board works they are usually going to last, I would look for something that might have touched it? BT is on to something, fuses, but there would have to be a reason for them to go. Power supply, connection?

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4

I visually checked the fuses, I’ll put a meter on them this morning. I didnt see any chips on the board, I did have it in an enclosure. I did test the extruder driver and it moves the axis, so I may try that fooling with the sketch. Thanks for your help.

5

All the fuses are good. U7 on the mini rambo gets extremely hot. Too hot to touch, so maybe it was a random chip hitting the board? Anyway, went into the header file, pins_RAMBO.h, and changed the pin values of the z axis to the e0 pin values for ;

Z_STEP_PIN

Z_DIR_PIN

Z_ENABLE_PIN

Z_MS1_PIN

Z_MS2_PIN.

Then I moved the z axis to the extruder plug on the board. But I must have missed something. The z axis now works with the cnc commands, but z will only move in one direction?

 

6

Sounds like it is a endstop issue, run M119 and see what is says for Z endstop.

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7

Which firmware version did you start with when you made the edits? What is the end stop status (M119)?

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8

M119 shows all end stops - open. I’m using MPCNC813MRambo_GLCD_T8.

9

I think that’s on older version of the firmware. Try starting with MPCNC_Rambo_T8_16T_LCD from Ryan’s github page and make the same changes to the firmware.