Code :

Code: 25
Display: No image
Description: 1. Seal tape is removed? 2. GND OPC is well grounded? 3. LSU running well? 4. Biss voltage is normal? 5. Lower toner?
Remedy: 1. Removing seal tipe 2. Measure the resistance between frame ground and the ground spring attached frame. Confirm stable ground. Unless bad ground, detach cabinet, check where is bad point 3.Adjust LSU or replace it 4. Normal Dev bias = -300V 5. Shake toner cartridge and print.If a liitke good, toner is empty

Code: 26
Display: Light image
Description: 1. Check seal tape removing 2. LSU light power normal? 3. Enough toner? 4. High charger voltage? 5. Lower bias voltage 6. Contamination of high voltage contact 7. Transfer volatge and roller
Remedy: 1. Check and remove tape 2. LSU light power check is difficult. Compare with new one and check. 3. Check toner and developer counter 4-5. Measure all high voltage output 6. Leakage toner cause bad contact and increase contact resistance. Clean contaminated area.

Code: 27
Display: Dark image
Description: 1. LSU light power normal? 2. Bias voltage output is high? 3. Video data is always supplied?
Remedy: 1. Check the rated level and replace 2. Set to power rating 3. Replace defected board

Code: 28
Display: Background
Description: 1. High voltage output is normal? 2. C/R of Toner cartridge is contaminated?
Remedy: 1. Adjust to the rated status 2. Replace Toner cartridge

Code: 29
Display: Ghost
Description: 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: 30
Display: Stains on back of paper
Description: 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: 31
Display: Poor Fusing
Description: 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.

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