SHARP STE003 Technical Report

Date: Aug. 28, 1995

COPIER : SF-2014

No. : STE-003

IMPROVEMENTS TO THE WELDING FOR
THE DEVELOPER TANK.

1.Model Name: SF-2014/21 14/2214

Z-800, SN-1420/1430

2.General: Faults develop in the weld for the developer tank for several reasons. One of these is
that the tank tends to move up and out of place. In response to this problem, the
following improvements are planned.

1. The type of developing problems which are likely to occur when the weld is faulty.

(1) The gear comes loose. (DV drive PWB 23T and 59/24T in the main drive UN)
(2) The image does not appear, or density is too low. (Especially on the rear side).

2. Checking the weld.

(1) Checking the main body of the set.

A. remove the drum unit.
B. move the toner hopper (the joint of the toner cartridge) and check the positioning
of the Developer UN drive gear’s teeth (whether they are properly meshed) as
shown in the figure below.

Main drive UN 59/24T

Drum unit’s fulcrum axis
(The UN above the back of
the frame)

DV drive PWB 23T

.

Because the teeth will mesh in the correct direction during the driving motion of the
unit, as long as there is al ready some meshing, there is no problem.

Developer UN
(front side)

SHARP CORPORATION Printing and Reprographic Supplies Division

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Yellow

C

3.Description: (1) We are reducing the base of the developer unit by 0.5 mm.

Rear view of the developer box.

Bottom view of the developer box.

This portion will
be removed.

(Temporary fix)
We will add a step to production in which we will cut the rib at the base of the developer
unit. We will mark the appropriate parts with white paint.

Front of the developer box frame

Location of markings

(Permanent fix)
The mold for the part will be changed.

(2) Widening of the curvature angle of the metal plate in the attachment section of the

DV guide caused by improper pressure welding of the developing unit sometimes
causes the slide surface of the developing unit to bend upward, elevating the
developing unit. All production machines have been checked as of 1995 mid-May
production, but machines already out on the market should be checked as described
in the figures below for the problem arising from the attachment process during
replacements or by detached DV guide plates.

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