A B C D a b c d e 0 1 2 3 4

CHAPTER 4 TROUBLESHOOTING
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examples
Recommendation
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abcdefghijk
A B C D
a b c d e
0 1 2 3 4
Toner specks
• 
Make sure that you use paper that meets the specifications. A
rough surfaced paper may cause the problem. 
 See “What kind
of paper can I use” in Chapter 1.
• 
The drum unit may be damaged.  Install a new drum unit.  
See
"How to replace the Drum unit" in Chapter 3.
Hollow print
• 
Make sure that you use paper that meets the specifications.
See “What kind of paper can I use” in Chapter 1.
• 
Select the ‘Thick paper mode’ in the printer driver, or use
thinner paper than you are currently using.
• 
Check the printer’s environment as conditions such as high
humidity may cause this situation to occur.
All black
• 
Clean the primary corona wire of the drum unit.  
See "How to
clean the printer interior and Drum unit".
• 
The drum unit may be damaged.  Install a new drum unit.  
See
"How to replace the Drum unit" in Chapter 3.