Ricoh Aficio FT4027, Service Manual

Page: 531 / 685

Development bias, drum charge voltage, and exposure lamp voltage
NOTE: Only items marked with
@
are different from A153, A155, A156, A157, A159, and A160 copiers.
The following table shows how process control affects development bias, drum charge, and exposure lamp voltages for various machine
operations.
Mode Development Bias [V] Drum Charge Voltage [V] Exposure Lamp Voltage [V]
Copying
ADS mode (–240) + ADS corr
Reproduction
ratio
correction
+
V
R
correction
+ B
Vexp +
V
L
correction
Manual
ID
mode
ID Level
1 ~ 6
(–240) +
Manual ID
correction
+
Reproduction
ratio
correction
+
V
R
correction
+
@
Halftone Mode + B
(–1500) +
V
R
correction
+
Temperature
correction
+
@
Halftone Mode + C
Vexp +
Manual ID
correction
+
V
L
correction
+
@
Halftone Mode
ID Level
7
(–240) +
Lightest ID level
dev.bias
+
Reproduction
ratio
correction
+
V
R
correction
+
@
Halfotone Mode + B
VSP Pattern Detection (–300) + BP + ID correction (
@
–1370) +
Temperature
correction
+ CP 0
VR Pattern Detection
0
(–1500) +
V
R
correction
+
Temperature
correction
+ C
0
VL
Pattern
Detection
Forced VL
Detection
BL +
V
R
correction
+ VBL (ID) Vexp
VL Detection BL + (–25) +
V
R
correction
+ VBL (ID) Vexp +
V
L
correction
Non Image Area (–200) +
V
R
correction
+ VBL (ID) 0 0
Auto ADS Gain Adjustment 0 0 Vexp +
V
L
correction
NOTE: B = Development bias adjustment factor, selected with SP2-201-001.
BP = Correction to the development bias used for making for VSP patterns, selected with SP2-203.
BL = The value of the development bias that was reached during the most recently performed forced V
L
detection routine.
V
BL
(ID) = ID compensation factor based on the current ID correction used for making VSP patterns.
C = Correction to the drum charge voltage, selected with SP2-001.
CP = Correction to the drum charge voltage for maknig VSP patterns, selected with SP2-003.
Vexp = Exposure lamp voltage, selected with SP4-001.
28
PRO
C
ES
S CO
NTRO
L
A207/A208/A211
SM
@
@
@