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Service Guide ML520/521
Chapter 4 Failure & Repair Analysis
4.8.03 Font Test
General Information
The font test is a one page sample printout of each available typeface.
HSD 10 cpi
HSD 12 cpi
HSD 17.1 cpi
Utility 10 cpi
Utility 12 cpi
Utility 17.1 cpi
NLQ 10 cpi
NLQ 12 cpi
NLQ 10 cpi Double Height / Double Width
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
Running the test without paper loaded will allow the printhead to print on the platen. This will dirty the
platen, cause excessive wear of the ribbon, and may damage the platen, ribbon, and printhead.
Procedure
Follow these steps to print the font test.
1. Load the paper.
2. Power off the printer.
3. Press and hold the LF switch while powering on the printer. You must hold the LF switch until the test
starts to print.
4. The one page test will print, then stop.
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