Ricoh D257 MPC6503SP

Symptom

Horizontal white streaks may appear in small solid black areas (smaller than 3cm x 3cm).

Cause

Electrical charge of the Bk toner is lower compared to other toners because the Bk station is the most downstream, and the transfer bias is set higher in FC mode. This prevents black toner from maintaining the optimum charge level, which may result in poor toner transfer.

Action

1. Print black in FC mode.
   PS driver and PCL driver
   • Select “Print Quality” from Detailed Settings.
   • Select “User Setting” as Settings for Images.
   • Select “CMY+K” or “Black by K (Black) – Text Only” for PS driver, and “CMY+K” for PCL driver
   as Gray Reproduction.
   Fiery driver
   • Select “Job Properties” of the affected image.
   • Select “Expert setting” from “Color” tab.
   • Select “Gray/Black Processing” Tab.
   • Specify “Normal” for Black text and graphics in order to print in CMYK mode.
2. Increase the image transfer current. (+5 to 10 A from the default) [#016: Image transfer current: FC: K]. First increase the value by +5 A. Check the results and increase or decrease the value by 1 A as necessary. Do not increase by more than +10 µA from the default.
   Risks:
   Image density may decrease in Bk solid images that have a high coverage ratio. (Density at the
   sides become low.) Ghosting of Bk halftone images
3. Adjust the paper transfer current. (-5 A to -15 A from the default)
   To ease the symptom, decrease the paper transfer current in [#026 & #027: Paper transfer current:
   FC: Side 1, 2].
   Decrease -5 µA at a time as you check the results.
   Do not decrease by more than -15 µA from the default.
   Risks:
   Low image density
   Toner scattering around solid images
4. Increase the maximum image density.
   To ease the symptom, increase the maximum image density of Bk in [#011: Maximum Image
   Density:K] by adjusting the notch to the [+].
   Side effect:
   Low toner yield

MP C6503/C8003, Pro C5200S/C5210S

SP No.	SP Name
SP2-451-001	ITB K:Standard:FC
SP2-451-002	ITB K:Standard:BW

Pro C5200S/C5210S only

No.	IMSS setting
015	Image Transfer Current: BW
016	Image Transfer Current: FC: K

Note:
• Transfer capability and image density may become worse.
• Residual image may appear in black halftone areas.