SHARP SP1536 Technical Report

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Date: Jan. 29, 1993

COPIER : SF-7370

No. : SP-1536

PREVENTING COPY IMAGE DISTORTION BY MOISTURE CONDENSATION

1.Model name: 6514/6413

2.General: Owing to installed machine location and the use of dampened paper, a distortion may

appear in a copy image caused by water evaporated when the copy paper goes through the fusing unit. To avoid this, the following change is made in order to change the air flow within the machine.

3.Phenomenon: Bleeding may appear towards the copy moving direction in the multicopy mode.

In case of a vertical line.

Copy moving direction

4.Cause: Distortion may appear in the image when the following conditions are met together. (1) The machine is tried to make copy when the machine internal temperature is

different from the room temperature for about 8 °C as the machine was left unused

under a cold temperature for a long time or the machine internal is cold in night time. (2) Use of a moistened paper. (3) Where there is a relatively high humidity existing in the room the machine installed.

In case of the character “ ”

If copies were made in the multicopy mode under the above conditions, water vapor from the fuser unit attacks the main motor area through five holes (φ8) of the motor baseplate of the paper entry side of the fuser unit as carried along by the main motor

SHARP CORPORATION Reprography Division

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Green

fan and is condensed on the drum, resulting in the circulation of dampened air around the area. As more copies are produced, more moistures appear around the drum and condenses on the drum. Consequently, the condensed moisture is collected by the DV plate of the DV cover, thus causing the electric charge collected on the drum flows through the water (short). This distorts the image causing distortion to appear on the copy.

4.Description: (1) Block holes in the motor baseplate. (View of the motor baseplate from below with the machine left open)

Front frame side

Transport guides

Shadowed area

φ8 These five 5 holes are clogged by the use of a new press mold.

(2) Square holes added to the fuser cover

(To release the air within the fuser unit to the rear.)

Square holes provided new

Rear frame side

Fuser cover

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The new fuser cover pasted with the high temperature caution label and the guide mylar T will be in supply.

5.Action: (Factory action)

Since mid-October 1992 for blocking of the motor baseplate holes. Since August 1992 for addition of fuser cover square holes Since October 1992 for the SMF product.

Ref.

Model

No.

SF-7320

1. Interchangeable. 4. Not interchangeable.

2. C urr e nt t y pe c a n be u s ed i n place of n ew t y pe . New ty pe cann ot be us ed in place of curr ent type .

3. C urr e nt type ca nnot be us e d in p l ac e o f ne w ty p e. New t y pe c a n be u s ed i n pl a ce of curr en t ty p e.

Parts m ar ke d wi th “ ” is imp or t an t fo r m ai n ta in ing t he s a fe ty of the s e t. B e sur e t o rep l ace t he s e pa r ts wi th

specified ones for maintaining the safety and performance of the set.

name

7370

Version P/G No.

14 -1

All

4 -13

US,UK

Australia

Other

export

areas

Current parts New parts

Parts code Parts code

PCOVQ0811FCZ1 PCOVQ0811FCZ2 AS

CDAIU0314FC04 CDAIU0314FC05 AW

— CCOVQ0811FC52 AV

— CCOVQ0811FC53 AV

Price

rank

5. Interc ha ng ea ble i f r ep l ace d wi th s a m e typ es of relate d pa r ts in use.

6. Others.

Parts name

Fuser cover

Motor baseplate

Fuser cover unit, including the high temperature caution label

Effective time

’92/8 3

Mid-Oct 1992

––

Inter-

change-

ability

Note

Service parts only

Service parts

only

3/3

Ref.

Model

No.

1. Interc hang eable . 4. Not inter chang eabl e.

2. Current type can be used in place of new type. New type cannot be used in place of current type.

3. Current type cannot be used in place of new type. New type can be used in place of current type.

Parts marked with “ ” is important for maintaining the safety of the set. Be sure to replace these parts with

specified on es fo r m a in ta i ning t he s a fe ty an d pe rformanc e of t he s e t.