Ricoh A172 Service Manual page 432

FEB# SDC206 / SDC206E-001
SUBJECT: MAJOR DIFFERENCES VS THE SC106
The RGB filter coefficient for
each copy mode (letter/photo)
hasbeenchanged.
New matrixes and masking
2 1 coefficients have been added to
match the new copy modes.
Image The image separation IC has
3 Separation IC been changed.
Laser Exposure
A heavier stabilizer has been
installed on the Drum mirrors.
Development The sleeve rollers have been
Sleeve Roller changed to a sand-blast type.
Toner Tank
A toner end sensor has been
t
The green lever has been
m a i n b o d y .
Transfer Belt
Transfer Belt
The number of threshold levels
Bias
that decide transfer belt bias
1 1 depending on environmental
conditions has changed from 2 to
Transfer Belt The belt lubricant mechanism
Cleaning has changed to apply lubricant
directly to the transfer belt.
To improve gradation and
reproduction quality.
See 4.4 in section 2 for details.
To reduce photo/letter image
separation errors in auto detect
mode.
To reduce the occurrence of
To eliminate the 1.25 mm
horizontal lines in halftone image
areas caused by the grooves on
the sleeve roller.
See 6.2 in section 2 for details.
See 6.2 in section 2 for details.
See 6.2 in section 2 for details
prevent partial blanking of
lines (due to incomplete toner
transfer) from appearing on
3
2 for details.