Oki C3520 - Manual (Page 115)

Troubleshooting > 115
Faxes received sometimes look distorted:
If the document received is wider or longer than the paper loaded
in the paper tray, the machine automatically reduces the width
or length of the document so that it will fit on the paper. This type
of problem could also be communication related.
The display shows a invalid toner cartridge:
A toner cartridge that is not specified for use in this machine has
been installed. Contact the nearest supplier for service.
The display shows a invalid image drum:
An image drum that is not specified for use in this machine has
been installed. Contact the nearest supplier for service.