Hi Rob,

The original fan is defect and the replacement I did with a "Papst"-Fan works ( I can hear it), but on the end of the worm-up from the printer, I get the error 53.7. I think there is a problem on the third wire. I need instead of a tacho-signal a fan with a on/off swich, like this NMB 1604kl-04W-B59 (L01)....?!?!

bye crazymelki