Service manual

1.3.14 Potential Control in Abnormal Sensor Conditions
You can check the result of the process control self check with SP 3-975.
One of the following codes will be displayed.
SP3-975 Process control self check result
Code
No.
Error
SP No.
(Displays
Values
Only)
Potential Causes Note
01 No error
80
V
SG
_ave
Error
1. ID Sensor
2. Dirty ID Sensor
3. Drum
• Agitate the developer to
charge up the toner
• Check the ID sensor
81
V
SG
_ptn
Error
1. ID Sensor
2. Dirty ID Sensor
3. Drum
• Agitate the developer to
charge up the toner
• Check the ID sensor
85
Vmin (color)
Difference
Error
3-910-1
(Bk)
3-910-2 to
3-910-4
1. ID Sensor
2. Dirty ID Sensor
3. Drum
4. Development Unit
• New or fairly new
machine: ID sensor or
electrical noise
• Check the development
unit or drum unit.
90
Development
Potential
Calibration
Error
3-4-1 (Co-
efficient)
3-4-2
(Intercept)
1. Faulty Drum Potential
Sensor
2. Faulty High Voltage
Supply Board (V
B
)
3. Faulty Drum (Pin Hole)
4. Drum Grounding Shaft
not properly connected
5. Electrical Noise
6. Residual Voltage on the
Drum
• Not enough waiting time
allowed before the
forced process control
self check.
• Check the drum
grounding shaft hood
inside the drum.
• Check the output voltage
at the potential sensor
(TP213) on the printer
main board with a digital
oscilloscope (during the
potential calibration).
91
V
D
Error at
Home
Position
1. Improper installation of:
-Charge Corona Unit
-Drum Potential Sensor
-Drum
• Check that the following
are installed correctly:
-Development Unit
-Drum Unit
-Charge Corona Unit
Detailed
Section
Descriptions
PROCESS CONTROL
SM 2-11 A166/A187/A189
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA