SHARP SP1945 Technical Report

Date: Oct. 24, 1995

COPIER : SF-2014

No. : SP-1945

MEASURES TO PREVENT THE OCCURRENC E O F
ABNORM AL NOIS E IN THE FA N MOTOR (VFM).

1.Model name: SF-2014/21 14/2214
Z-800, SN-1420/1430 (only for machines bound for the USA).

2.General: Cases have occurred where the blades of the exhaust fan motor (VFM) came in contact
with the fan casing, causing abnormal noise when the fan revolved. To alleviate this
problem, the measures described below have been carried out.

<Cause>
To prevent abnormal noise caused by vibrations
from the fan motor, the shape of the teeth which
secured the fan motor in place was changed, but
this change caused problems during the
attachment of the outer case of the machine,
when the teeth created excess pressure on the
casing causing it to become deformed, which
created the danger of the fan casing coming in contact with the blades of the fan motor,
causing abnormal noise.

3.Description: <Market action.>
Should the problem described above occur in a
machine already out on the market, the F side of the
VFM should be rotated 90° and fixed to the R side
when the screws are attached, as shown in the
figure to the right.
(The above measure, when carried out with pressure
applied in the directions indicated by the arrows, will
cause a decrease in the warping (deforming) of the
fan casing.)

Rib.

Pawl.

F Side.

R Side.

Upper left cabinet.

Section where contact

R side.

F Side.

Fan motors produced by a different maker are used
in machines bound for UK-SEEG. The strength of
the parts are greater than that of the machines in
which the problem described above occurred, and
as a result the measures described above are not necessary.

R Side.

SHARP CORPORATION Reprography Division

F Side.

1/3

Green

C

<Temporary and permanent measures.>

(1) The F side of the fan motor (VFM) has been rotated 90° (the same as the market

action described above).

(2) To prevent the fan motor (VFM) from becoming depressed, the rib in the upper left

cabinet has been cut after the production processes have been completed (This has
been accomplished by a change in the metal pattern as a permanent measure).

After the rib cut was
introduced as a
permanent measure (the
change in the metal
pattern), it is no longer
neces s a ry to ro tate the
fan motor (VFM) 90° as
described above, and
this action is no longer
carried out.

The section designated by the
diagonal lines has been cut.

Bottom right side.Bottom left side.

Note: Service parts in stock have had the rib cut already carried out, and therefore no
changes are necessary for the parts codes.

(3) A vibration prevention sheet has been added between the fan motors (VFM)

(to prevent abnormal noised caused by the vibrations).

R side
fan

Added vibration
prevention sheet.

F side
fan

Note: The measures described above were not necessary for machines bound for the
UK-SEEG, but measures <2> and <3> have been carried out anyway as general
improvement measures.

4.Action: ∗ For machines bound for destinations other than UK-SEEG → From 1995
mid-August production.
Only for machines bound for UK-SEEG → Running change.

2/3