Ricoh FT8680 Service Manual page 67

31 July 1995
2) ADS Compensation (V
Dark
According to the original background density, the bias is compensated. The
compensation value is determined with the voltage measured by the ADS
sensor (ADS Voltage) as follows:
V = – 295 {V
BA ADS
A : Initial Exposure Sensor Output
0
A : Current Exposure Sensor Output
1
If the exposure lamp output is changed, the value of V
To compensate for this change, V
NOTE: V + V
BA BADJ
3) V
BADJ
= 30 M (- 7 ≤ M ≤ + 7)
V
BADJ
V + V can be adjusted using SP mode (ADS Sensor Adjustment) to
BA BADJ
absorb the tolerance of the ADS pattern in the factory.
In this mode, V
BA
NOTE: Do not adjust the setting of V
V in the filed.
BS
)
BA
ADS voltage (V)
(A /A ) – 2.80}
0 1
ADS
have a limited range from 0 V to +260 V.
SP setting -7
Darker
+ V can be lowered below 0 V for testing in the factory.
BADJ
ADS
(A /A ) is used instead of V
0 1
SP setting +7
Light
ADS Voltage
in the field. Adjust the setting of
BADJ
2-43
DEVELOPMENT
Light
A171D524.wmf
is also changed.
.
ADS
A171D680.wmf