Polar 76 EM - Error code 88

[printlab.works]

Hi all,

I am getting an error code 88 on my Polar 76 EM. Does anyone know what it means?

Thanks

 

[Buntpapier]

The safety bolt, without being activated, has left the locking position or is not returning to the locking position within 2 seconds after cutting cycle completion. Knife is not in the uppermost position.

Is this problem permanently or intermittent?
I would not even switch my brain on before this machine has four carbon brushes instead of two. With two carbon brushes are too much problems.

I would check:
is the knife really in the UDC
the knife afterrun
the mechanical components of the safety bolt (especially if it is a horizontal moving bolt)
the switches (B.SBE and B.SBA) of the safety bolt and its wiring. You need at least 20 V d.c. at the mother board