6 - 12; White Spots on black text ; and graphics at 94 mm - Page 123

6 - 12   TROUBLESHOOTING

White Spots on black text 

and graphics at 94 mm 

(3.7 in.) intervals

Black Spots at 94 mm 

(3.7 in.) intervals

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If the problem is not solved after printing a few pages, the drum unit may have 
glue from label stock on the OPC drum surface.

Clean the drum unit as follows:

1

Position the print sample in front of the drum unit, and find the exact position 
of the poor print.

2

Turn the drum unit gear by hand while looking at the surface of the OPC 
drum.

3

When you have located the mark on the drum that matches the print sample, 
wipe the surface of the OPC drum with a cotton swab until the dust or paper 
powder on the surface comes off.

Caution

Do not try to clean the surface of the photosensitive drum with a sharp 
object, such as a ball-point pen, and so on.

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The drum unit may be damaged. Put in a new drum unit. See Replacing the 
drum unit in Chapter 5.

Examples of poor print 
quality

Recommendation

94 mm
(3.7 in.)
94 mm
(3.7 in.)

94 mm
(3.7 in.)
94 mm
(3.7 in.)