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Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
4.8.02 Rolling ASCII Test
General Information
1. The rolling ASCII test is a continuous printout of all 96 ASCII characters.
2. Use this test to check the following items.
3. Print Quality
4. Across the entire length of a line
5. Down the entire page
6. Line Spacing
7. Left Margin Alignment
At the top of the test is the printer type (1), emulation (2), country (3), and firmware revision level
(4). This information is often required while performing service or when contacting Okidata. Have
this test available during your service call.
CAUTION
Before running this test, make sure that continuous feed paper is loaded.
If you are running this test on a Microline 591, use wide paper or have the page width set for 8.5"
x 11" in the printer menu.
Running the test without paper loaded or having the wrong width paper loaded will allow the
printhead to print on the platen. This will dirty the platen, cause excessive wear on the ribbon, and
may damage the platen, ribbon, and printhead.
Procedure
Follow these steps to print the Rolling ASCII Test.
1. Load the correct size continuous feed paper.
2. Power off the printer.
3. Press and hold the
QUIET
switch while powering on the printer. You must hold the QUIET
switch until the test starts to print.
4. The test will continue to print until you press the
SEL
switch or run out of paper.