12 - 19; White Spots on black text ; and graphics at 3.7 in.- Page 180

12 - 19

   TROUBLESHOOTING AND ROUTINE MAINTENANCE

White Spots on black text 

and graphics at 3.7 in.

(94 mm) intervals

Black Spots at 3.7 in. 

(94 mm) intervals

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.

Do not touch the photosensitive drum with your fingers.

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.

Do not try to clean the surface of the photosensitive drum with a 

sharp object, such as a ball-point pen, and so on.

The drum unit may be damaged. Put in a new drum unit. (See 

Replacing 

the drum unit

 on page 12-34.)

Examples of poor print 
quality

Recommendation

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

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

Photosensitive drum