I-12 Poor - Page 225

Confidential

9-37

I-12 Poor 

fixing 

Possible cause 

Step

Check 

Result

Remedy 

Print paper 

1 

Is thick paper of more than 
43lb being used? 

Yes  Recommend to use the specified 

types of paper. 

Toner sensor 
failure 
(When 
printing is 
faint.) 

2 

Is the problem solved by 
replacing the drum unit or 
the toner cartridge? 

Yes  1) Toner is empty. 

2) The toner sensor is defective.  

Clean the toner sensor. 

3) If the wiper in the toner 

cartridge is broken, replace the 
toner cartridge with a new one. 

Fixing unit 
thermistor 
failure 

3 

Is the thermistor fitted 
correctly? 

No 

Fit the thermistor correctly. 

Low-voltage 
power supply 
PCB failure 

4 

Is the problem solved by 
replacing the low-voltage 
power supply PCB? 

Yes  Replace the low-voltage power 

supply PCB.