I-21 - Page 233

Confidential

9-45

I-21 

Horizontal lines 

Possible cause 

Step

Check 

Result

Remedy 

Paper tray 
contacts 

1 

Are the ground contacts on 
the right side of the paper 
tray connecting correctly? 

No 

Clean the contacts. 

Drum unit 

2 

Are the high-voltage power 
supply and drum unit 
contacted correctly? 

No 

Clean the contacts. 

I-22 

Light rain 

Possible cause 

Step

Check 

Result

Remedy 

Ground 

contacts 

Drum unit 
failure 

1 

Is the problem solved after 
replacing the drum unit? 

Yes 

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) 

High-voltage 
power supply 
PCB failure 

3 

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

Yes 

Replace the high-
voltage power supply 
PCB.