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Someone came in my store today, and decided to play with the lcd controls. Now when you ask to home, it just goes down about 25mm. I am baffled as to what they must have changed?

I think they set a new Z height at an absurd value. Try resetting it to a sensible value.

I'm having this issue right now and it was because I accidentally pressed on the "Set Z Height" menu item. I have tried, what I thought would correct it, but it still only goes DOWN when I press Home. I would expect it to go UP when I ask it to home until it hits each of the switches.

What I've tried to no avail:
- manually move the hot end tip to just above the center of glass and resetting Z Height via same menu that got it messed up in first place.
- tried running Calibration which I assume would just ignore existing settings and start from scratch.

You could reset the z height in the eeprom( it's probably showing a weird number) to approximately the right value and then go ahead and then calibrate the z height normally.

joe wrote:You could reset the z height in the eeprom( it's probably showing a weird number) to approximately the right value and the go ahead and then calibrate the z height normally.

Isn't that what the LCD Menu "Set Z Height" does? I tried that a few times to no avail.

briankb wrote:

joe wrote:You could reset the z height in the eeprom( it's probably showing a weird number) to approximately the right value and the go ahead and then calibrate the z height normally.

Isn't that what the LCD Menu "Set Z Height" does? I tried that a few times to no avail.

Sorry, forgot to mention the you should do it in the eeprom first THEN use the LCD menu.

joe wrote:Sorry, forgot to mention the you should do it in the eeprom first THEN use the LCD menu.

That worked. thanks Joe!!!!

Sweet. You are most welcome.

By saying: "You could reset the z height in the EEPROM ( it's probably showing a weird number) to approximately the right value and the go ahead and then calibrate the z height normally." You are saying that I should re-send the Repetier config file back to EEPROM?

My menu selection on the Orion console for EEPROM settings are "Store to EEPROM" and "Load from EEPROM", I have wiped the EEPROM and resent the config file numerous times back to the RAMBo board with no change in results. When I home the printer, the head lowers about 1", and it will not configure Z height correctly.

have you found a solution? having the same problem

The easy way to fix the problem (assuming you've got the newer hot end with the probe) is to connect with MatterControl (or whatever) and open a terminal. Run M502, M500, G29. This will reset the EEProm to stock values, Save, then calibrate to set your endstops, z height, and horizontal radius.