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Service Guide ML320/ML321
Chapter 4 Failure & Repair Analysis
4.9.02 Rolling ASCII Print Test
General Information
The Rolling ASCII Print Test produces a continuous printout of all 96 ASCII characters in a
rolling pattern. The type style set in the printer menu will be utilized.
Use the Rolling ASCII Test to check the following.
Print Quality
Across the entire length of a line
Down the entire page
Line Spacing
Character Formation
At the top of the printout, you will see the Printer Model, Emulation, Country Code,
and Firmware Revision Level.
CAUTION: If 13.6 inch Paper Width is selected in the menu, and you run this test with 8.5 inch
wide paper loaded, the test will print on the platen. This may damage the platen, ribbon, and
printhead. Set the paper width to 8.5 inches before running this test.
Procedure
Verify that the printer is loaded with paper and that the paper is the correct width.
Power OFF the printer.
Press and hold the TOF/QUIET switch while powering ON the printer. If the printer is
powered on and the Rolling ASCII Test does not start, you may have released the
PARK/QUIET switch too soon.
To stop the Rolling ASCII Test, press the SELECT switch or power OFF the printer.
