Abstract: The present invention is concerned with a method of deselecting the features of a xerographic printing machine to be able to continue operation of the machine even though a fault has been detected. In particular, the control isolates a detected malfunction to a particular input or output, determines that the particular input or output is related to a specific machine feature that has been selected for a particular job requirement, and instructs the operator by message to deselect that particular feature for continued machine operation. In the event that the isolated fault is related to a machine feature that has not been selected for the particular job requirement or that is not in that particular machine configuration, the control ignores the indicated fault for the continued operation of the machine.

Abstract: A reproduction machine incorporating self test routines to test the machine operating logic, particularly at start up, to insure the integrity and operability of the component parts of the operating logic. The tests include routines for initially checking the machine master control module logic and memory. A display panel on the master control module visually identifies any fault in the event the communication link to the machine main display has failed. Once the operability of the master control module is established, self tests of the various machine remote control modules are carried out followed by a test of the communication channel between all modules. Any fault found is visually identified to facilitate repair and servicing.