Toshiba e-STUDIO 4500c, Service Manual

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August 2006 PROCESS CONTROL
6-83
Detailed
D
escr
iptions
What is Done During Potential Control?
Pre-Processing
Sensor Check
Potential Control
(Toner Application
Control)
TD Sensor Output
Calibration
Process Control
Gamma Correction
Adjust Vsg
Create 10-Gradation Pattern Potential Sensor Pattern
ID Sensor Reads Developed
Pattern on the ITB
Calculate Potential Calculate Toner Amount
Calculate Development Gamma
Calculate Development Potential to Acquire
Targeted Maximum Amount of Toner
Refer to Pointer Table
Get Target Vd
for Charge Roller
Get Target Vpl
for Laser Power
Get Target Vb
for Dev. Bias
Adjust Vd
Adjust Vpl
Determine Settings to Create
Image
Drum Charge
DC
Development
Bias DC
LD Power
(PM)
Create 16-Gradation Pattern
ID Sensor Reads Pattern
LD Exposure Value Curve
Plotted
Change Amount of Toner
Calculate LD Gamma Curve
Update Process Control Gamma Table
Potential Control Process Flow
Relating SC Codes
*Adjusted for each color (Y, M, C, K)
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
Development
Gamma
Raise
Development
Gamma
Raises the
target setting
of the copy
interval
pattern, and
increases toner
concentration
Lowers the
target setting
of the copy
interval
pattern, and
decreaes toner
concentration
-or-
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
ID Sensor Detects Potential Sensor Detects
Temperature/Humidity
Sensor Detects
Detect VdHome
Adjust AC Charge
(Charge Roller)
Agitate Developer
Adjust Vsg
Potential Sensor Reads
Unexposed Pattern on Drum
ID Sensor Reads Developed
Pattern on the ITB
Adjust for Residual Potential, Calibrate Vr
Vd* Vb* Vpl*
Adjust Vd Adjust Vpl
ID Sensor Reads Pattern
TD Sensor Detects
Vtcnt/Vtref Calibration
2
1
3
4
5
6
7
8
9
B132D988.WMF