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21 E310 The intensity of the scanning lamp is incorrectly adjust-
ed.
Cause
Step
1
Connector
2
(poor con-
tact)
Intensity sen-
3
sor is dirty
Intensity sen-
4
sor
DC control
PBA
22 E400/E712
Cause
Wiring
RDF controller PBA
ed.2
Checks
Press the copy button. Does
the scanning lamp switch
ON?
Check the cables between the
DC control PBA and the
lamp intensity sensor. Con-
nection J112.
Clean the face of the intensity
sensor. Is the problem
solved?
Replace the intensity sensor.
Is the problem solved?
Step Checks
1
Turn off and on the
power switch. Is the
problem corrected?
2
Set the meter to the
200VDC range, and con-
nect the + probe to J2-6
and the – probe to J2-4
on the RDF controller. Is
the voltage about 24 V?
3
Replace the RDF con-
troller PBA. Is the prob-
lem corrected?
Yes/No Action
No
See "The scanning lamp
fails to turn ON."
No
Correct it.
Yes
End
Yes
End
No
Replace the DC control
PBA
Y/N Action
Yes End. (Check the wiring
between the copier's DC
controller PBA and the
RDF controller PBA.)
No
Check the wiring for the
supply of power from the
copier.
Yes End.
No
Replace the copier's DC
controller.
Trouble shooting 25
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