Causes: 1. High voltage output 2. Bad high voltage contact
Remedy: 1. Check every high voltage 2. Clean the inside machine or replace toner cartridge
Code: 08
Description: Stains on back of paper
Causes: 1. Contamination of transfer roller 2. Stains of paper path 3. Pressure roller’s contamination
Remedy: 1. Clean the transfer roller with vaccum cleaner 2. Clean the area of paper path with cloth or air cleaner. 3. Remove fuser and replace it
Code: 09
Description: Poor Fusing
Causes: 1. Use recommended paper? 2. Check fusing temperature 3. The machine was under the low temperature for a long time?
Remedy: 1. Should use recommended paper 2. Check engine board. If you have not thermometer, measure the thermistor voltage to CPU, If 2.98V+/-5% in printing CPU works well. Then, disassemble fuser and check the thermistor contact and thermistor. 3. Re-check after putting the machine in the warm place for certain period.
Code: 10
Description: Partial blank image (not periodic)
Causes: 1. Toner is low? 2. The toner cartridge is out of position?
Causes: 1. Develope roller scar or particle 2. Scar or particle (94 mm) 3. Transfer roller scar or particle (47 mm)
Remedy: 1-2. Replace toner cartridge 3. Replace transfer roller
Code: 12
Description: Different image density (left and right)
Causes: 1. Charge roller’s pressure force unbalance 2. Dev. roller and OPC or Dev. roller and blade’s pressure force unbalance 3. Transfer roller’s pressure force unbalance of each side
Remedy: 1-2. Change toner cartridge 3. Check left and right spring of transfer roller and the spring pressing the developer inside the machine