Yellow 20% Ess; Black 20% Ess - Epson AcuLaser C2900N Service Manual

Chapter 2 Operation of Diagnostic

4.5.7 Yellow 20% ESS

Outputs the yellow 20% density solid pattern on the whole area of an A4 sheet.
When a PQ problem occurs, this test isolates the problem to the yellow toner or other color toners by
comparing the print with the sample chart.
Check result: NG (Check the yellow toner.) OK (Check other color toners.)

4.5.8 Black 20% ESS

Outputs the black 20% density solid pattern on the whole area of an A4 sheet.
When a PQ problem occurs, this test isolates the problem to the black toner or other color toners by
comparing the print with the sample chart.
Check result: NG (Check the black toner.) OK (Check other color toners.)
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