Ricoh FT8680 Service Manual page 66

DEVELOPMENT
6.4.2 Bias Control In Copy Cycle
The bias output is determined by four factors.
The total bias is described as;
V = V + V + V
B BB BA
V = V + V (Manual ID Mode)
B BB BM
1) Base Bias (V
BB
Drum
Potential
As explained in the process control section, the base bias for development is
determined by the drum light potential (V
The base bias is also affected by the exposure lamp adjustment setting in the
SP mode.
V = V + 280 –
BB L2
∆
V = V – V
L2
NOTE: N = Number of the lamp adjustment setting in SP mode.
M = Number of the Latent Image Adj. in SP mode.
+ V (ADS Mode)
BADJ BS
)
V
0
Vd
Dark Original Density
∆
V + 10 N – 15 M
∆
(Maximum V = 210, Minimum
r
V
L
Vr
) measured in each original scan.
L
∆
2-42
31 July 1995
V
BB
Light
A171D528.wmf
V = 110)