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Designjet T920

89:03 Stacker ramps motor error

 

I performed the stacker ramps motor diagnostic test to troubleshoot the problem further. There was a grinding noise due to broken tooth on the gear.  Test failed. I replaced the stacker ramps motor, rerun the stacker ramps motor test with wheels. It failed again, so I ran the test again with out wheels and it passed. So can anyone tell me why this motor test fails with the wheels. The machine is running now with no error of the 89:03. Just curious why it fails diagnostic test with wheels? Any help will be appreciated. Thanks

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