konica 7020 error F23-1

[cantonakis]

I have 3 machines konica 7020 that display the same error F23-1.
Does any one know what kind of error is this and how to correct it?
Thanks

[Luther]

The PCL'S (PRE CHARGE LAMP)is disconnected or bad, or the printer driver board,check the connection on the pcl's,good luck

[redime]

I see this when new guys put drums and charge wires into the machine -- and they forget to plug the charge unit back in