Ricoh B234 Service Manual page 695

2720 Adjust Image Quality
User SP These SP codes adjust the amount of current applied to the transfer belt. When
the paper on the transfer belt passes between the belt and drum above, the charge
roller below the transfer belt applies a positive (+) charge to the belt above. This
positive charge attracts the negatively charged toner of the image from the drum
above, effectively transferring the image from drum to paper.
The image transfer current can be adjusted separately for four separate items:
Front, Back, Reduce Halftone, No White Spots.
001 Front Side
002 Back Side
003 Reduce Halftone
Streaks
004 Reduce White
Spots
2730 Unit Initialization
User SP
001 Development Unit
Use this SP code to initialize the TD sensor of a new development unit.
After you touch [Execute] this SP performs two tasks:
• Initializes the TD sensor to control the voltage applied to the TD sensor to make
its about 2.5V. Press [Start] after you see the voltage displayed.
• Supplies toner to the toner hopper (but not the development unit).
Note: The machine requires about 7 minutes to complete this SP adjustment.
002 Drum/Charge Unit
After you touch [Execute] to do this SP, it does important adjustments that affect the
operation of the machine to ensure that the supply of toner to develop each image
remains constant. Always do this SP after replacing:
• Pre-charge unit
• Charge unit
Development unit
003 Drum/Cleaning Unit
Do this SP before you remove the drum cleaning unit or the PCU unit. After you
touch [Execute], the drum rotates and is coated with a light coat of toner.
Note: Coating the surface of the drum with toner before removing the drum cleaning
unit ensures that the drum will not be damaged against the edge of a new drum
cleaning blade.
SM
Main Service Program Mode Tables
Adjusts transfer current for images on the front side of copies.
[0 to 3/1/1 step]
0: Light, 1: Normal, 2: Darker, 3: Darkest
Adjusts transfer current for images on the back side of copies
during duplexing.
[0 to 3/1/1 step]
0: Light, 1: Normal, 2: Darker, 3: Darkest
Do this SP and press [Execute] to reduce the density of
halftone areas of images on both the front and back sides of
copies.
Do this SP and press [Execute] to reduce the occurrence of
white spots (so-called medaka) in areas of dark coverage on
both the front and back sides of copies. To accomplish this,
the machine thoroughly cleans the surface of the drum with
the 2nd cleaning blade.
Super User Only
5-157
Super User Only
B234/B235/B236/D101/D102/D103