Ricoh DD 4450 - Advanced Sensor Malfunctions and Symptoms

Electrical Component Defects
SM 6-13 C279
Troubleshooti
ng
Component Condition Symptom
No paper
length
If the paper detected by the sensor is set, it
will not be detected, and a size different
from the set paper is displayed.
Long images will be cut because the
machine does not detect the presence of
long paper sizes on the table.
Ink Idling Roller HP Sensor
ON E-41 is displayed.
OFF
Printing Pressure HP Sensor Open E-43 is displayed.
Shorted
2nd Drum Master Sensor
Reflected
light /
There is a
master on
the drum.
Even if a clamp error occurs, the Master
Push Mylar is pressed and becomes dirty.
The “D” jam indicator is lit.
No master
The Master Push Mylar is not pressed. Cut
errors cannot be detected.
Duct Jam Sensor There is a
master on
the drum.
The “D” jam indicator is lit.
No master
There is a master in the lower master tray,
but the duct jam sensor does not detect a
master, the master vacuum fans do not pull
the master, and E-01 is displayed.
Duct Plate HP sensor ON E-42 is displayed.
OFF
Master Edge Sensor There is a
master on
the drum.
The “D” jam indicator is lit.
No master