SHARP SP2028 Technical Report

Date: Jul. 18, 1996

COPIER : SF-2050

1. MEASURE TO PREVENT PAPER JAMS AT THE UPPER SEPARA T OR PAWL IN
THE FUSING UNIT.

2. MEASURE TO PREVENT PAPER JAMS DUE TO MALFUNCTIONING OF THE
TRANSPORT CLUTCH.

No. : SP-2028

1. Measure to prevent paper jams at the upper separator pawl in the fusing unit.

1.Model Name: SF-2050

2.General: (1) When attempting to remove jammed paper in the direction of the paper delivery after

the copy paper has jammed in an accordion form at the fusing upper separator pawl,
the leading edge of the upper separator pawl sometimes gets caught on the fusing rear
lower paper guide (P/G ). If copy operations are carried out in this condition

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paper jams will occur.
When jams occur due to the reason described above, there is a danger of damage
occurring to the leading edge of the fusing upper separator pawl, and therefore caution
should be exercised to check for damage if such an occurrence should happen.

(2) When removing jammed paper from the machine, the fusing upper separator pawl

can get caught on the raised section of the fusing rear upper paper guide (P/G )

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which sometimes causes paper jams to occur.

To alleviate the two problems described above, the following measures have been
carried out.

3.Description: (1) As shown in the figure below, four sections of the fusing rear lower paper guide have
been cut to alleviate the problem of the leading edge of the fusing upper separator pawl
from getting caught.

Fusing upper separator pawl

FU rear lower paper guide

CutCutCut

Cut

SHARP CORPORATION Reprography Division

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Green

C

(2) The raised section of the fusing rear upper paper guide has been cut (four locations)

to alleviate the problem of the rear edge of the fusing upper separator pawl from getting
caught.

Raised section (four locations)

FU rear upper paper guide

Note: There is a possibility of the same problem occurring if an error is committed in the

sequence each time a change in the position of the upper separator pawl is carried
out (every 100 k), and this has been reported in T/R SP-1987. For this reason your
cooperation in exercising caution to insure that the proper sequence is maintained
is requested.
Furthermore, for machines already out on the market, the raised sections of the
fusing upper paper guide (four locations) should be cut as a measure to alleviate
the problems described above (the raised sections of the fusing upper paper guide
can easily be broken off by using long nose pliers.

4.Action: From 1996 mid-April production.

2. Measure to prevent paper jams due to malfunctioning of the transport clutch.

1.Model Name: SF-2050

2.General: <Problem>

Deviations in the leading edge of copy images and copy paper jams both due to ’z’
folding of the copy paper in the copy paper transport section of the machine sometimes
occur.

<Cause>

If the time required for the clutch changeover is too short when an ’ON’ signal from the
PPD3 sensor is sent from the transport clutch TRC2H to the transport clutch TRC2L,
the worst possible condition may occur, whereby the TRC2H and the TRC2L clutches
both registering as ON, which can sometimes result in damage to the TRC2L clutch.

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