SHARP SP1975 Technical Report

Date: Nov. 30, 1995

COPIER : SF-2050

1. MEASURE TO PREVENT CONTACT OF THE CAPACITORS USED IN THE OPERATION
CONTROL PWB.

2. MEASURE TO PREVENT DIAGONAL FEEDING DUE TO MALFUNCTIONS IN THE
REGULATION GUIDE PLATE IN THE ADU UNIT .

3. MEASURE TO FIX THE PAPER POSITION WHEN FEEDING COPY PAPER INTO THE FUSING
UNIT.

No. : SP-1975

1. Measure to prevent contact of the capacitors used in the operation control PWB.

1.Model name: SF-2050

2.General: There was a danger of some of the capacitors which are used in the operation control

PWB coming in contact with the original document photo sensor PWB or the original
document photo sensor cover. To alleviate this problem, the measure described below
was carried out.

3.Description: As illustrated in the figure shown below, the capacitors have been attached by hot melt,
preventing them from coming in contact with the original document photo sensor PWB
or the original document photo sensor cover.

To prevent D404 from coming in contact with IC 430 or other surrounding
parts, it has been attached to the inside of the PWB.

Toward the
inside face of
the PWB.

Edge face of the PWB.

C414, C412
C411

C414.

The distance is to be greater
than 18 mm from the PWB
edge face.

Attached by hot melt

(To be perpendicular)

C412.

C411.

Attached by hot melt

C410

C409

C410.

C410

The parts code of the PWB was changed after the measure described above was
carried out.

SHARP CORPORATION Reprography Division

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Green

C

2. Measure to prevent diagonal feeding DUE to malfunctions in the regulation guide
plate in the ADU unit.

1.Model name: SF-2050

2.General: No trouble occurs when the regulation guide plate, which controls the lateral direction of

the copy paper, operates correctly, but the possibility of diagonal feeding arises when
the regulation guide plate is curved, causing it to become caught on the edge of the
square hole of the DUP slide, which prevents it from controlling the copy paper. To
alleviate this problem, the measure described below has been carried out.

3.Description:

Regulation guide plate

Old New

A taper has been added to prevent

Square hole edge

This section interferes with the aquare hole,
causing malfunctioning

the regulation guide plate from
becoming caught

4.Action: From 1995 mid-September production.

3. Measure to fix the paper position when feeding copy paper into the fusing unit.

1.Model name: SF-2050

2.General: When installing the fusing unit into the machine, the boss on the rear side of the fusing

unit sometimes failed to be guided properly into the positioning holes in the rear frame,
causing the boss to hit the face of the frame. To alleviate this problem, the measure
described below has been carried out.

3.Description: As illustrated in the figure, the shape of the boss has been changed to a step-type, to
improve the performance of the boss by making it easier for it to be guided into the
positioning hole.

Old New

AB

Change in shape.

The length of 'B' is 12 mm longer than
the length of 'A'.

4.Action: From the start of 1995 November production.

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