6-42
FS-1900
(8) Gray background
Check the print density setting.
• The print density may be set too high. Try adjusting the print density using the Remote operation
panel utility. For details refer to the printer’s User’s Manual.
Check the surface potential of the drum (in the drum unit).
• The drum potential should be approximately 230±15 V. This may vary depending on production
lots. Measurement is possible only by using the jig and tool specifically designed for this purpose.
The drum unit will have to be replaced if it bears values far out of the allowable range.
Check the grid.
• Clean the grid by grid cleaner. See page 3-9.
The developing roller (in the developer) may be defective.
• If a developer which is known to work normally is available for check, replace the current developer
in the printer with the normal one. If the symptom disappears, replace the developer with a new
one. See page 5-4.
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