SHARP SP1567 Technical Report

Date: Apr. 21, 1993

COPIER : SF-2022

No. : SP-1567

TROUBLESHOOTING PAPER SKEW WITH A
NEW PS SPRING

1.Model name: SF-2022/2027

2.General: It may probable to evoke paper to skew owing to a load imbalance caused by

the way the PS spr ing installed. To correct it, c hange is made to the shape of
the PS spring.

3.Cause: Because the spring coil is t oo short when the PS s pring was installed on the
transport baseplate or a difference in the shape of the PS spring between front
and rear, an imbalance might be caused for the load across springs.

4.Description: The coil length of the PS spring is changed from 9mm to 20mm with their
shapes changed to the same to have ev en load.

* Described in the following are changes observed three times since the first

production unit to stabi lize the P S spring load.

Front side

Rear side

Description in Parts Guide

PS spring

Same for the front and rear.
MSPRT1646FCZZ

Through first production to
August 1992

PS spring B9F

Load 700 10%
MSPRT2022FCZZ

PS spring B9

Load 700 10%
MSPRT2018FCZZ

+
–

Round hook

+
–

Through September to
mid-October 1992

PS spring B9FK

Load 60 0 40g
MSPRT2086FCZZ

PS spring B9RK

Load 60 0 40g
MSPRT2087FCZZ

+
–

+
–

Ground
connection

Right angle
hook

Through mid-October 1992
and on

PS spring N

Load 68 0 40g
Same on front and rear
MSPRT2100FCZZ

+
–

SHARP CORPORATION Reprography Division

1/5

Green

C

NOTE: Because the latest PS spring is longer , a PS spring hol ding hole is

newly provided in the rear side of the transport baseplate. Note that the
new PS spring cannot be installed on the old type baseplate as it does
have the hole. Both t he old and new types will be available as servic e
parts. Although there is no parts code changed for the transport
baseplate, the hole for the new PS spring installation had been provided
since September 1992 for the US version and mid-September for other
local versions.

5.Action: Since mid-October 1992.

[New PS spring installation procedure]

Upper PS roller

PS roller

Transport baseplate

Bushing for the PS roller

PS spring N

Bushing for the
upper PS roller

PS clutch

The one with
a wider space
must be on
the lower side.

PS roller

➀ Fasten the side of the spring having a wider

span to the elongated hole on the lower side
of the transport baseplate.
NOTE-1: The PS spring must be installed

from the rear side first.

NOTE-2: Use the PS spring in the same

bag which provided for the same
load.

➁ Press it to the upper PS roller busing

with your fingertip, slightly expanding
the spring.
NOTE-1: Do not expand it too much.

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Upper PS roller bushing