What Is Done During Potential Control? - Toshiba e-STUDIO4500c Service Manual

August 2006

What is Done During Potential Control?

Detect VdHome
Adjust AC Charge
Pre-Processing
(Charge Roller)
Sensor Check
Create 10-Gradation Pattern Potential Sensor Pattern
Potential Sensor Reads
Unexposed Pattern on Drum
Calculate Potential
Potential Control
Get Target Vd
(Toner Application
Control) for Charge Roller
Adjust Vd
Drum Charge
TD Sensor Output
Calibration
LD Exposure Value Curve
Process Control
Gamma Correction
ID Sensor Detects
Potential Control Process Flow
Agitate Developer
Adjust Vsg
ID Sensor Reads Developed
Pattern on the ITB
Calculate Toner Amount
Calculate Development Gamma
Calculate Development Potential to Acquire
Targeted Maximum Amount of Toner
Get Target Vb
Get Target Vpl
for Dev. Bias
for Laser Power
Adjust for Residual Potential, Calibrate Vr
Vd* Vb* Vpl*
*Adjusted for each color (Y, M, C, K)
Adjust Vpl
Development LD Power
DC Bias DC (PM)
Vtcnt/Vtref Calibration
ID Sensor Reads Pattern
Change Amount of Toner
Plotted
Calculate LD Gamma Curve
Update Process Control Gamma Table
Potential Sensor Detects
6-83
PROCESS CONTROL
Relating SC Codes
SC436 to 439: Potential Sensor Error :vd
SC316 to 319: AC Bias Charge Adjustment Error
SC497: Temperature and Humidity Sensor Error
SC497: Temperature and Humidity Sensor Error
SC400: ID Sensor Error 1: Calibration
SC418: LED Error during Vsg Adjustment
SC410 to 413: ID Sensor Error 2 to 5: Development Gamma
SC414 to 417: ID Sensor Error 6 to 9: Development Start Voltage
Update Toner Supply Control
Parameters (During Copy Interval
Process Control Self-Check)
Determine Target Toner Amount Based
Using Development Gamma
Lower Raise
Development Development
-or-
Gamma Gamma
Raises the Lowers the
target setting target setting
of the copy of the copy
interval interval
pattern, and pattern, and
increases toner decreaes toner
concentration concentration
SC432 to 435: Potential Sensor Error 1 to 4: Vr
SC420 to 423: Potential Sensor Error 1 to 4: Vd Adjustment
SC424 to 427: Potential Sensor Error 5 to 8: Vl Adjustment
SC410 to 413: ID Sensor Error 2 to 5: Development Gamma
SC414 to 417: ID Sensor Error 6 to 9: Development Start Voltage
Temperature/Humidity
TD Sensor Detects
Sensor Detects
B132D988.WMF