NOTE: - Page 231

Confidential

9-43

I-18 

Gray background 

Possible cause 

Step

Check 

Result

Remedy 

No 

Recommend to use the specified 
types of paper. 

Print paper 

1 

Does the paper being used 
meet the paper 
specification (weight, etc.) 

Yes  Recommend to change to freshly 

unpacked paper. 

Toner sensor 
failure  
(printer side) 

2 

Is the error indication 
displayed when the toner 
cartridge and drum unit is 
taken out of the machine? 
(The front cover is closed.) 

No 

Toner sensor failure.  Clean the 
toner sensor and check the toner 
sensor connection. 

Toner 
cartridge 
failure 

3 

Is the problem solved after 
replacing the toner 
cartridge? 

Yes  Replace the toner cartridge. 

Yes  Replace the drum unit. 

Drum unit 
failure 

4 

Is the problem solved after 
replacing the drum unit? 

No 

Replace the high-voltage power 
supply PCB. 

NOTE: 

The following cases increase the possibility of this problem. 

• 

Acid paper is being used.

• 

The drum unit is at the end of its life.

• 

There is dust or paper powder

.