How to clean the pressure roller ; NOTE: - Page 220

Confidential

9-32

I-5 

Dirt on the back of paper 

Possible cause 

Step 

Check 

Result

Remedy 

Fixing unit 
dirty 

1 

Is the pressure roller dirty? 
Is any other area in the 
printer dirty? 

Yes  Clean the pressure roller referring 

to the following procedure. 

Yes  Replace the drum unit 

Dirt in the 
drum unit 

2 

Is the transfer roller dirty? 
Is the problem solved after 
replacing the drum unit? 

No 

Replace the high-voltage power 
supply PCB. 

NOTE: 

This problem may disappear after printing approximately 10 pages of completely blank  

sheets. 

How to clean the pressure roller 

Clean the pressure roller as follows; 
(1)  Set 5 or more sheets of paper in the paper tray.  
(2) Press the 

Menu/Set 

(Menu)

, 

Start

, 

▲

, 

▲

, 

▲

, 

▲

 keys in this order so that the machine goes into 

the maintenance mode.

(3) MFC7420/7820N

Press the 

6

 and 

7

 keys.   

DCP7010/7020/7025 
Enter 

6

 and 

7

 by using the   and 

Set

 keys. 

The machine starts to print the grid pattern continuously.

(4)  When five pages are printed, press the 

Stop

 key.  The machine returns to the initial stage of the 

maintenance mode.

(5) MFC7420/7820N

Press the 

9

 key twice so that the machine returns to the ready status. 

DCP7010/7020/7025 
Enter 

9

 twice by using the   and 

Set

 keys so that the machine returns to the ready status.