Ricoh FT4460, Service Manual, Page: 100 / 413

28 February 1989
5.18 BIAS CORRECTION
5.18.1 Vr Correction
V r C O R R E C T I O N
With repeat copies, the residual potential on the OPC drum gradually affects
the copy image density. With Vr correction, the residual potential is corrected
using the ID sensor.
5.18.2 SP Mode Correction
S P m o d e N o . 3 7
S e t V a l u e 0
1 2
3
4
B i a s
V o l t a g e
0
+ 4 0 V + 2 0 V - 2 0 V - 4 0 V
C o d e
N
D D
D L L L
D e n s i t y Standard
Darkest
Darker Lighter
Lightest
With SP correction, the voltage
Mode #37.
–160V when manual ID level 4
Value is –200V.
levels noted above can be applied using SP
2-47