User Check - Page 216

Confidential

9-28

I-1 

Light 

User Check 

(1)  Check the printer’s environment.  Conditions such as humidity, high 

temperatures, etc. may cause this situation to occur. 

(2)  If the whole page is light, toner save mode may be on.  Disable toner save 

mode within Printer Properties tab of the driver. 

(3)  Try installing a new toner cartridge or drum unit. 

Possible cause 

Step 

Check 

Result

Remedy 

Ground 

contacts 

Toner sensor 
failure 
(printer side) 

1 

Can printing be started 
with the drum unit and 
toner cartridge removed? 

Yes 

Check if the toner 
sensor is dirty and check 
the toner sensor 
connection. 

Toner sensor 
failure 
(toner 
cartridge side) 

2 

Is the problem solved when 
4 or 5 pages are printed 
after the toner cartridge is 
replaced with a full one? 

Yes 

The wiper of the toner 
cartridge is defective.  
Replace the toner 
cartridge. 

Drum 
connection 
failure 

3 

Are all the contacts 
between the drum unit and 
printer body connected 
correctly? 

No 

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

(1), (4) 
(5), (6) 

HVPS / Main 
PCB failure

4 

Is the harness connection 
between the HVPS and the 
main PCB correct? 

Yes 

Replace the HVPS or 
the main PCB. 

Dirt on the 
scanner 
window

5 

Is there any dirt on the 
scanner window? 

Yes 

Wipe it off with a soft 
clean paper. 

Laser unit 
failure

6 

Is the problem solved after 
replacing the laser unit? 

Yes 

Replace the laser unit.