Error 21 on MBO B120 machine

[krael]

HELP!!!!! In my shop we use a MBO B120 machine to perforate with. There is an error 21 showing on the display and the manuals are no help. Any assistance from anyone would be greatly appreciated. Thank you

 

[F.I.Imgonefishing]

HELP!!!!! In my shop we use a MBO B120 machine to perforate with. There is an error 21 showing on the display and the manuals are no help. Any assistance from anyone would be greatly appreciated. Thank you

Most of our error 21 that will not clear are blown fuses in the control panel

 

[ColorMonkey]

So usually its related to timing of the sheet passing the photocells. In the parallel unit are you having trouble feeding? Usually to get rid of it free the jam, first hit the red button then the black (stop rollers/begin rollers) and that should clear the error. Also I believe where the double sheet detector is if it get stuck forward (detects a double) until it is freed it will not allow you to clear the error. Hope that helps I no longer run folders so maybe bad recall.