Kyocera TASKalfa 2550ci, FS-C8020MFP, FS-C8520, FS-8025MFP, FS-8525MFP SERVICEBULLETINS 2MV 0011 C326
(Page.1/2)
Subject
Measures against the JAM421x (Exit Sensor Stay Jam)
Model l:
FS-C8025MFP, FS-C8020MFP, FS-C8525MFP, FS-C8520MFP,
TASKalfa 2550ci
KDC’s Classification Entire Stock Rework In-Field modification at next visit
In-Field modification by case No modification necessary
Field Measures:
When the paper jam J421x frequently occurs, it might be caused by the factor described below. In this case,
please replace the spring in the fuser unit with the new spring (No.7) by following the attached procedures
(Excel file).
Serial Nos. of the Affected Machines: Planned from the available timing in the Dec. 2012* production
* The above is the plan at the present moment. Please note that this information is subject to change.
<Operation of the following parts when pressurizing the fuser>
The cams to switch the fuser pressure rotate counterclockwise when
feeding paper except in the envelope mode and the paper is
pressurized by being pinched by the heat and the press rollers.
The metal actuator is lifted up to turn OFF the PI sensor by the gear
fitted at the same shaft as the cams when the pressure is sufficiently
applied, and then the cams stop.
(If the pressure is released, the parts are rotated in reverse.)
Fig. X (Wrong state)
Normally, the protrusion of the gear lifts up
the metal actuator. However, the metal
actuator is lifted up by the fan-shaped rib
may prematurely turn OFF the PI sensor.
PI sensor is
prematurely turned
Protrusion of
the gear
Fanshaped rib
Service Bulletin Ref. No. 2MV-0011 (C326)
<Date> December 17, 2012
(Notice) This phenomenon does not occur in the envelope mode, which does not require fuser pressure operation.
Phenomenon
In a very rare case, when paper is ejected from the fuser unit while the cams are switching the fuser pressure
stop on the way of their rotation, the OFF timing of the eject sensor might be delayed due to contact of the cam
with the actuator to switch the exit sensor and it may cause the paper jam J421x*.
* The last digit of the jam code indicates the paper source.
Cause
Depending on the neighboring gear's thermal expansion or structural variation, etc, the metal actuator (A) has no
gap margin to the thrust direction. In this state, the actuator (A) may prematurely turn OFF the PI sensor (Refer
to X in the following figure) by rotating together with the gear, and the cams may stop on the way of their rotation.
Then, the OFF timing of the eject sensor may be delayed due to contact of the actuator to switch the eject sensor
with the rear side cam immediately after trailing edge is exited from the fuser unit (Refer to Y), which may cause
paper jam detection.
Metal actuator (A): Regulates the rotation of the cams to switch the fuser pressure to prevent excessive rotation
in the pressure direction.
Content of Changes
The tension of the spring (No.7) to release the metal actuator was
increased so that the metal plate will not rotated at the premature
timing by the gear loads applied from the thrust direction.
[Positions of the parts --- Related parts only]
(The illustration below shows the normal fuser pressure state.)
KYOCERA Document Solutions Europe
Technical Customer Service Division (TCSD)
(Page.2/2)
No.
Old Part
No.
New Part
No.
Description
Q’
ty
Com
bi
patility
Remarks
Old
New
Old
New
TASKalfa255c/FS-C8025MFP, TASKalfa205c/FS-C8020MFP,
TASKalfa 256ci/FS-C8525MFP, TASKalfa 206ci/FS-C8520MFP
1
302MY93081
2MY93081
302MY93082
2MY93082
FK-896
1
1
X
O
Except KDCN and KDKR
TASKalfa 2550ci
2
302MV93091
2MV93091
302MV93092
2MV93092
FK-8315
1
1
X
O
Except KDCN and KDKR
Common component parts of No.1 to No.6
3
------------
302K025941
2K025941
+SPRING PRESS
ACTUATOR
-
1
-
O
Service part for field
measures (*1)
(Machine
rear side)
(Machine
front side)
Heat roller
Press roller
Spring (No.7)
Eject sensor (in ON mode)
Actuator 1 to switch the eject sensor
(It is linked with the actuator 1 which actually
contacts paper.)
Cams to switch the fuser pressure
(The cams above fully rotate in the
pressure direction.)
Gear
PI sensor
Metal actuator
Cause
Phenomenon
Y
X
Actuator 2 switching the
eject sensor
Fig. Y (Wrong state)
Rear cam: It stops on the way
of its rotation as the PI sensor
is turned OFF when applying
pressure.
Rotation of the actuator 1 to
turn ON the eject sensor may
be delayed by this contact.
Service Bulletin Ref. No. 2MV-0011 (C326)
<Date> December 17, 2012
"+" mark at the beginning of the part name indicates that it is a component part.
*1: The old spring is not individually supplied.
KYOCERA Document Solutions Europe
Technical Customer Service Division (TCSD)
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