Description: Power leakage of some kind. Heat, exposure, AC or power supply.
Code: F23
Description: Toner motor
Code: F26
Description: Toner density adjustment problem. This means machine is undertoned. To repair, replace developer and enter "47" mode. Press 51. Press print. Allow the machine to cycle until it stops. Some feel that you should disconnect the toner motor first. This code happens probably because either machine wasn't set up properly, or the customer kept on using the machine with the toner light on.
Code: F28
Description: Corona problem. Could be any corona. Must reset with "25: mode, "P45" set to "0"