My TAZ 6 Y-Axis “bed positioning” stepper motor motor stopped functioning correctly last week.
When given commands to operate, the motor shaft shakes back and forth instead of rotating.
A few tests (below) seem to point towards a control system error, but my knowledge is exhausted at this point. Without community help, the next step here appears to be sourcing/buying/installing/flashing a new RAMBO board and hoping this restores funtionality.
I’m very much hoping it’s something simpler (?), but not skilled enough to make any further “home hacker” guesses at this point! If any of you know anything here I would love to hear your feedback. =)
Here is what had been tested so far:
drive belt removed & “Y axis” move command resulted in the same motor behavior (shaft shaking instead of rotating) (e.g. suggest problem not related to external mechanical resistance)
motor replaced with spare - same “shaking” issue came back (e.g. shaft on new motor jiggles back and forth instead of rotating)
firmware flashed this this week & no change (still shakey instead of spinney)
Electrical components ok:
3.1) 3x fuses on Rambo board checked, all intact/functional)
3.2) all 4x wires leads to motor confirmed conductive/functional
input/output check = “uh-oh” →
wire harnesses from malfunctioning Y-Axis bed motor plugged into functional X-Axis horizontal tool head positioned stepper motor. The Y-motor input caused the x axis motor to get shaky… (Note reconnecting the x motor back to his original leads caused the x-motor to function normally again).
Basically, every test so far is pointing at the shaking malfunction being something related to input/output signal errors on the y axis motor control loop (that the firmware flash doesn’t care about).
Any ideas? (Looking at ordering another rambo at this point in the interim)