Oki C7200 Service Manual page 233

To suspend test printing, press Key 7 77 77.
At the start of or during test printing, if any alarm listed under the Detail column in the table specified below is found, the corresponding alarm message appears
on the operator panel and test printing is suspended. (For error details, see Sec. 4.1.2.9 Error Messages and their Details.)
Print Patterns:
Patterns 0, 8 ~15: Blank paper output