Ricoh DD 4450 Service Manual page 178

Electrical Component Defects
Component
Thermal Head HP Sensor
Thermal Head Temperature
Sensor
ADF Original Detection
ADF Skew Correction
ADF Registration
C279
Condition
increase E-47 is displayed.
the
pressure
release
the
pressure
E-09 is displayed whenever the start
Open
button is pushed.
E-04 is displayed whenever the start
Shorted
button is pushed.
The original is fed even if the ADF does
not have an original. Therefore the "P"
jam indicator is lit
Open
The Jam LED is ON. The machine cannot
shift to the energy-saving mode at the
correct time.
The Platen Cover is scanned even if the
ADF has an original
Shorted Even if the original is set in the ADF in
energy-saving mode, it cannot return from
energy-saving mode.
ON:
reflected The "P" jam indicator is lit.
light
OFF: No
The "P" jam indicator is lit when paper is
reflected
fed-in from ADF.
light
ON:
reflected The "P" jam indicator is lit.
light
6-14
Symptom
SM