I-3 - Page 218

Confidential

9 - 3 0

I-3 

Completely blank  

Possible cause 

Step 

Check 

Result

Remedy 

Ground 

contacts 

Developing 
bias contact 
failure 

1 

Are the developing bias 
contacts between the printer 
body and drum unit dirty? 

Yes

Clean the electrodes at 
both sides. 

(4) 

Yes

Clean the shaft and the 
electrode. 

(1) 

Drum unit 

2 

Are the drum shaft and 
drum electrode of the 
printer body connected 
correctly? 

No 

Check the connection 
between the shaft and 
the electrode. 

(1) 

Drum unit 
failure 

3 

Is the problem solved after 
replacing the drum unit? 

Yes

Replace the drum unit. 

Toner 
cartridge 
failure

4 

Is the problem solved after 
replacing the toner 
cartridge? 

Yes

Replace the toner 
cartridge with a new 
one. 

Scanner 
harness 
connection 
failure

5 

Is the scanner harness 
connected securely?   

(Check if there is any play 
in the connection.) 

No 

Reconnect the connector 
correctly. 

Main PCB 
failure 

6 

Are printing signals being 
input to the laser unit? 

Is the problem solved after 
replacing the main PCB? 

Yes

Replace the main PCB. 

Yes

Replace the laser unit. 

Laser unit 
failure 

7 

Is the scanner interlock 
lever damaged? 

No 

Replace the high-
voltage power supply 
PCB. 

Laser scanner unit assy 

Interlock lever