User Check - Page 229

Confidential

9 -4 1

I-16 Black 

spots 

User Check 

(1)  If the problem is not solved after printing a few pages, the drum unit may 

have glue from label stock on the exposure drum surface.  Refer to Step 1 
in the table below and 

NOTE 

in the next page. 

(2)  The drum unit may be damaged.  Install a new drum unit. 

Possible cause 

Step 

Check 

Result

Remedy 

Ground 

contacts 

Drum unit 

1 

Are the spots at 74mm 
intervals? 
(The problem is not solved 
after printing a few pages.) 

Yes 

1) If toner or glue 

remains stuck, wipe it 
off gently with a 
cotton swab.  (Refer 
to 

NOTE

 in the 

previous page.) 

2) If the exposure drum 

is scratched or 
deteriorated 
(exposed), replace the 
drum unit. 

Drum 
connection 
failure 

2 

Is the contact between the 
drum unit and printer body 
connected correctly? 

No 

Clean contact electrode 
both on the drum unit 
and in the printer body. 

(7) 

Fixing unit 

3 

Are the spots at 79mm 
intervals? 
(The problem is not solved 
after printing a few pages.) 

Yes 

1) Check and clean the 

heat roller with a 
cloth dampened with 
alcohol. 

2) Replace the fixing 

unit. 

High-voltage 
power supply 
PCB failure 

4 

Is the problem solved after 
replacing the high-voltage 
power supply PCB? 

Yes 

Replace the high-
voltage power supply 
PCB.