14 - 15; White Spots on black text ; and graphics at 94 mm - Page 243

14 - 15

   TROUBLESHOOTING AND ROUTINE MAINTENANCE

White Spots on black text 

and graphics at 94 mm 

intervals

Black Spots at 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.

Caution

Be careful not to 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.

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.

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

Replacing 

the drum unit

 on page 14-29.)

Examples of poor print 
quality

Recommendation

94 mm

94 mm

94 mm

94 mm

Photosensitive drum