Oce 3121, Technical & Service Manual

Page: 135 / 908

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ed.2 Trouble shooting 27
25 E403
26 E411
Cause Step Checks Y/N Action
Feeding motor
clock sensor
(S9) 1 Set the meter to the 20VDC
range, and connect the + probe
to J9-15 and the – probe to J9-16
on the RDF controller PBA.
Does the reading alternate
between 5 V and 0 V when the
clock disk is turned slowly by
hand? No Check the wiring from
the feeding motor clock
sensor (S9) to the RDF
controller PBA; if nor-
mal, replace the motor
clock sensor (S9).
Feeding motor
(M2) 2 Set the meter to the 200VDC
range, and connect the + probe
to J11-1 and the – probe to J11-2
on the RDF controller PBA.
Does the reading of the meter
change to 23 V when the Copy
Start key is pressed? Yes Check the wiring from
the feeding motor (M2)
to the RDF controller
PBA; if normal, replace
the feeding motor (M2).
No Replace the RDF control-
ler PBA.
Cause Step Checks Y/N Action
Original tray
paper sensor (S1),
Registration sen-
sor (S3) 1 Connect the probes of the meter
to the connectors on the RDF
controller PC shown below. Is
the reading of the meter 2.3 V or
lower when nothing blocks the
sensor?
Original tray sensor S1:
(+) J5-7, (-) J5-8
Registration sensor S3:
(+) J9-20, (-) J9-21 Yes Go to step 2.
No Replace the RDF control-
ler PBA.
S1, S3 2 Is the light-receiving face of
each sensor soiled with paper
lint? Yes Clean the light-receiving
face of the sensor with a
cotton swab, and go to
step 3.
LED1, LED2 (for
sensor) 3 Connect the probes of the meter
to the connectors of the RDF
controller PBA shown below. Is
the reading of the meter about
0.6 to 1.1 V?
LED1: (+) J9-1, (-) J9-2
LED2: (+) J9-3, (-) J9-4 No Check the wiring from
the LED to the RDF con-
troller PBA; if normal,
replace the LED.