• Code: 01
• Display: Vertical Black Line and Band
• Description: 1. Straight thin black vertical line occurs in the printing. 2. Dark black vertical band occur in the printing.
• Causes: 1. Damaged develop roller in the Developer. Deformed Doctor-blade or cleaningblade. 2. Scratched surface of the discharge roller in the developer. 3. Partly depression or deformation on the surface of the transfer roller.

• Code: 02
• Display: Vertical White Line
• Description: White vertical voids in the image.
• Causes: 1. Foreign matter stuck onto the window of internal lenses of LSU mirror. 2. Foreign matter or toner particles between the developer roller and blade. (In case the life of the developer has been expired, white lines or light image occur in front of the image.) 3. It may occur when Burr and foreign substances are on the window of the developer frame. 4. If the fuser is defective, voids occur periodically at the top of a black image.

• Code: 03
• Display: Horizontal Black Band
• Description: 1. Dark or blurry horizontal stripes occur in the printing periodically. (They may not occur periodically.)
• Causes: 1. Bad contacts of the voltage terminals to developer. 2. The rollers of developer may be stained. Charge roller = 38.5mm Supply roller = 51mm Develop roller = 50mm Transfer roller = 56.8mm

• Code: 04
• Display: Black/White Spot
• Description: 1. Dark or blurry black spots occur periodically in the printing. 2. White spots occur periodically in the printing.
• Causes: 1. If dark or blurry black spots occur periodically, the rollers in the Developer may be contaminated with foreign matte or paper particles. ( Charge roller : 38.5 mm interval OPC drum : 96 mm interval) 2. If faded areas or voids occur in a black image at intervals of 96 mm, or black spots occur elsewhere, the OPC drum surface is damaged. 3. If a black image is partially broken, the transfer voltage is abnormal or the transfer roller's life has expired.

• Code: 05
• Display: Light Image
• Description: The printed image is light, with no ghost.
• Causes: 1. Develop roller is stained when the toner of developer cartridge is almost consumed. 2. Ambient temperature is below than 10°C. 3. Bad contact caused by the toner stains between the high voltage terminal in the HVPS and the one in the set. 4. Abnormal output from the HVPS. (Run self-test and check 1-4)

• Code: 06
• Display: Dark Image or a Black
• Description: The printed image is dark.
• Causes: 1. No charge voltage in the engine board. ( Perform DCU diagnostic code 01) 2. Charge voltage is not turned on due to the bad contacts between power supply in the side of the Developer and charge terminal of HVPS.

• Code: 07
• Display: Uneven Density
• Description: Print density is uneven between left and right.
• Causes: 1. The pressure force on the left and right springs of the transfer roller is not even, the springs are damaged, the transfer roller is improperly installed, or the transfer roller bushing or holder is damaged. 2. The life of the Developer has expired. 3. The toner level is not even on the developer roller due to the bad blade.

• Code: 08
• Display: Background
• Description: Light dark background appears in whole area of the printing.
• Causes: 1. Recycled recording paper has been used. 2. The life of the Developer has expired. 3. The up-to-down movement of the transfer roller is swift? 4. The HVPS is normal? (Perform DCU diagnostic code 01-04)