Sharp Z-50 Service Manual

z–a

SHARP SERVICEMANUAL

CODE :O0ZZ50SM/ //–E

MODEL Z-SO

[2] Operation panel and

[3] Unpacking and insta I o

[4] Supplies. . . . . . . . . . . . . . . . . .

w. .1

[51 comPonent location . . . . . . . . . . . .

[61COPYprocess. .. . . . . . . . . . . . . . . . . . . . !

[7] Paperfeed and transport section . . . . . . . . . . . . . . .

[81 Optical system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .: .?.

[9] Fusersection

+~i

. . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . ........ .. .

[10] Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . !

[11]

[12]

<35

Electrical section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Circuit diagramandtime chart

,...,.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

37 4

[13] Actual wiring chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

SHARP CORPORATION

Z–ti

[1] BASIC SPECIFICATIONS

Type:

Desktop

Copying system:

Dry-type electrostatic plain pmer copier

Kinds of originals:

Sheets, book Thickness: 30 mm (1 .18 inch) maximum with the

original cover in use.

Weight:

1.8 kg (4 Ibs) maximum

Original size:

A4 maximum

Copy size:

(Cassette feed)

A4, B5, A5 (56 to 80 g/m2 )

or 8% x 5%” to 8% x 11” (14.9 lbsto 21.3 Ibs)

(Manual feed)

A4 to A6, postcard, businesscard (52 to 1309/m2 )

or 8Y2

x 11” to8Y2x 5%” (13.8 lbsto 34.5 Ibs)

COPYspeed:

8 copies/minute (all sizes)

First COPY:

11 seconds (time required until the copy paper is delivered to the exit tray after depression of the PRINT

switch for A4 or letter size paper.)

Warmup time:

20 seconds at rated voltage, room temperature at 20 to 25°C (68° to 77°F), 65%RH.

Multicopying:

1 to 19 copies, countdown type, with auto repeat

Magnification ratio:

1 : 1*1%

Exposure system:

Slit exposure by moving table.

Paper feed system:

Cassette and manual feeds

Developing system:

Magnetic brush development (2-component developer)

Fusing system:

Heat roller type

Light source:

Halogen lamp (1OOV series 200W, 200V series 215W)

Power requirements:

Local supPly voltage +10%.

Power consumption:

1.15 kW maximum, 50 wh standby (power down mode)

Physical dimensions:

411 (W) x 41O(D) x 209(H) mm

16.44(W)

x 16.4(D) x 8.36(H) inch.

Weight:

16 kg (35.2 Ibs)

Display Functions:

PRINT:

The green lamp turns ON when the copier is ready for copying, turns OFF during the warmup time, and flashes when in the power down mode.

MU LTICOPY: Multicopy number dispiayed on LED,

normally O.

MISFEED:

The red lamp flashes when the paper is

misfed.

—

TONER:

Flasheswhen the toner box is empty.

DRUM:

ON after 8,000 copies. Starts to flash after 9,000 copies and the machine stops.

Accessories:

Semi-universal cassette x 1

Instruction manual X 1 Power supply cord x 1

Options:

Drum urtridge TD cartridge (black, red, blue, brown) ~~~ Machine stand (ZT-50D)

The term “TD cartridge”

means the “Toner Developer

cartridge”.

l–

z–w

[2] OPERATION PANEL AND INDICATOR

FUNCTIONAL DESCRIPTION

I 1

Power switch and power ~upply cord Power is turned on and off using the power lever. Upper frame release button Used to release the frame lock when a misfeed occurs or the drum cartridge has to be replaced. Doorswitch

Used to check the front door position.

If the front cover is opened, the misfeed and multicopy

indicator wi II be reset. Auto exposure control Selects appropriate exposure rate depending on the contrast and background color of the original. Exposure control lever It has three set positions. For most originals, set at the center position.

To make the copy darker, move to DARK. To make the copy lighter, move to LIGHT. Misfeed indicator

When a misfeed occurrs, this lamp turns ON. .

TD cartridge replacement indicator The lamp flashes when the TD cartridge needs replacement.

Drum cartridge replacement indicator

Afier 8,000 copies, the indicator will start to flash.

An additional 1,000 copies can be made. At this time the indicator will stop flashing and stay ON. No

additional copies can be made until the Drum canridge

is replaced. Multicopy Copy numbers between 1 and 19 mn be entered

using the (–) or (+) key. Depression of the (–) key while “O” is displayed brings “19” into the display,

and continued depression of the key reduces the number. When the (+) is depressed after “19”, the

number is returned to, ::0”. Every time a copy is produced in the multicopy mode, the number in the display coun~ down. When the (–) isdepressed in the middle of multicopy operation, the number of copies already made is displayed.

Auto repeat ,j,.,, ~<.<.., ,,,,

(

Upon completion of copying in the multicopy mode, the copy number previously set returns to the copy

numberset.display.Use of the CLEAR key resets the

number. One minute after completion of copying, the number @ the auto repeat functions are automatically cleared.

Paper feed alarm (P indication) If a sh~t of paper is not transferred to the paper

stop.

par after depre~ion of the PRINT switch, or the cassette is

empty,“P” is “displayed in the copy number

wind~~.

:If the COPY. NUMBER key or the CLEAR

key is depressed or the MANUAL FEED switch is

Wb:’ti ‘~~ief”ti b~ned, the “P” indication is also cancalled.

@ Clear

!~,+:

[

Multimpy and auto repeat modes are cleared with the

‘) ‘ CLEAR

key.~~ne rnlnuti after completion of copy

. - ..-

‘;’:? fifi@;ati6nJ~&~~Qt n~rnbar and the repeat functions

are automatically *-tid.” i‘ “

@ PRINTswitch

~,; ~~ ~ saconds:aftar-powar isturned on, the READY lamp

turns ON indicating ”-tit” the copier is ready for cOPying. if left unoparatad for go ~conds, the

copier$tha ~ into the power save mode and the {

READY lamp changes from ON to flashing. When the PRINT switch is pressed while the READY lamp is on, the machine immediately starts to copy. When the PRINT ~itch is pressed while the READY lamp is fkshin~ thepower~va mode is cancalled, the original table rn&’’”to:’~+@py -~fi position, and it starts the

armup cycle. is dependent it will be less

the PRINT

–2–

....----

‘... . ..

;. ..

.. ~....

...

,’ ,.

.,..,.,

. . ,.- -. --.”.

. :......,..,*..-,.K,:

z–%

[31 UNPACKING AND INSTALLATION

1. Unpacking

(1)

Open the carton in the following sequence.

@ Cut the tape around the top of the package and

open the flaps.

@ Remove the accesso~ container top padding and take

out accessories.

@ Remove the upper packing cushion and take out the

reachinc.

Dustcover,instructionmanual, andotherprintedmaterials

Itainer

)

, .

, ,

~ Cassette

-upper paCkin9

CUShiOn

, Lowerpackingcushion

–3–

..- .

2. Installation

Installation requirements: Please note the following requirements when installing the copier.

Machine Environment Avoid installation in direct sunlight or bright locations near a window.

Direct sunlight may cause the plastic components and

the original cover to deform. Frosted glass may also

produce the same effect.

.=—-.

‘r

s..!

‘-’ ‘:%2

‘. —.

,, —- .—

11---

Avoid installation in a hot, damp place or where

rapid changes in humidity occur (for example; near an air conditioner). This may cause paper to dampen or moisture inside the copier, and may lead to a misfeed and deterioration in copy quality.

Avoid installation in a place where the ventilation or air circulation is poor. Never install the copier near inflammable materials or

in the presence of ammonia fumes. Installation near a diazo copy machine may lead to a

deterioration of copy quality or a machine malfunc-

tion.

Install the copier near the wall outlet.

(2) Space around the copier The copier requires at least IOcm of clearance between the rear side and the wall. This space is required for proper cooling fan ventilation. Adequate working space around the

machine should also be allowed for ease of operation.

.....

/.. ,:.

.-.

:.4*$-,:,

The recommended environmental conditions are: ,

;,.~i, -

20 to 25 degrees C (68 to 77 degrees F.), 65%*5%RH:. ~ : The nominal environment conditions are: ‘ ‘.”>:;~~. -} “. ~~.,:.’”. .,

10 to 30 degrees C. (40 to 86 degrees F.), Ot~85%RH..~=~~ “’+S.:.- -

. .

If the copier is to be installed in an area~of<higher<,~>..<:,~:

temperature the humidity must be lower: Example;,.’ .,,<;’; .”

If the temperature, is 35 degrees C. (95 de;&~F\4$’’w:;. ‘‘~ the humidity should be 65%.

, \..’” .

~~““’’>”< ‘“>1 I ‘: -

Avoid installation in a place where dust or.<b~>~<~

,,. ,“

ooeratingran9e

encountered.

~~;”~~~~i~ur~ “

Dust deposit inside of the copier may lead to

ade <

ioration of copy quality or machine trouble.

‘T

1 me power SUPPIY line should have a capacity of more

than 15A, capable of supplying more than 90% of the

-..

/ .-\

-..

~.. ‘ “:” . ‘-”’’” .. ,,~ ~ @ ‘::e:::’tageatfu” ‘oad.

use an extension cord, or operate any other

—

—.

—

-—

aq~ipment from the same wall outlet.

z-m ~

~ p

install the machine on a level surface.

.\/

... .. “

The toner density and copy quality may be affected

. .-

unlessthe machine is installed in a level condition.

Do not install the copier on an unstable or uneven surface. The copier must be placed on a level surface to

(4) Ground connection

@ Use a properly grounded (three prong) wall outlet

permit proper functioning.

only.

–4–

.- ...-,.-..—

3. Installation procedure @

Remove the poly bag and tapeings that secure the

original table and the exit tray. Remove the desiccant.

● Desiccant is used in the USA and Canada only.

Tapeing

z-so

Desiccant is used to protect the drum

from moisture

absorption, it should discarded upon unpacking.

@ Open the front cover.

Push the front cover open buttons located at both sides

of the copier.

open buttons

~ Install the drum cartridge (Except USA, Canada)

a. Open the front cover. b. Open the upper frame. c. Remove the cover from a new drum cartridge. d. Push in the drum cartridge all the way, then close

the upper frame.

Protective cover

-——

ODOD!D

Never expose the drum to direct sunlight or touch the drum surface with your fingers.

Open the box containing the TD cartridge. Remove the TD cartridge from the bag and shake horizontally four or five times.

,~,

\,&j

;--~

Remove the cover from the TD cartridge. Save the TD cartridge cover. It should be used to seal the TD cartridge if the copier must be shipped for servicing or in case you move.

Cover

Slide the TD cartridge in until it locks in place.

Close the front cover.

Remove the paper cassette from the bag.

Fan the copy paper and insert it into the cassette. (Maximum: 100 sheets)

f 5

—

5–

----

,-. .,,

a. Push the pressure plate unti I it locks in position.

r 1

Pressu;eplate

b. Adjust the paper guides in the cassette to the COPY

paper width and length.

;OPVpaper ength

paper width

c. Fan the copy paper and insert it into the cassette.

Make sure the edges go under the corner hooKs.

Swing the exit tray down.

Plug the power cord into the copier and then into the nearest outlet.

Turn the power on.

After machine installation or TD cartridge replacement, the ready lamp may require a longer period (No

minutes or less) before it turns ON.

~~ -

-’.

ihe~~c plug that

P. :: --

comas with the

& -.. ,

*F2:T:..:. ..

Prduct matches ymr

wall outlet.

..-—..-..-.-—-.

4. How to mke a copy

Opentheoriginal qver.

@ Place tie orig~~~i”’the

upper right corner, and close

the

originalcwer..

@ Selectthe

nurnhr of copies desired.

● If a mi~ake is made, press the key to clear the entry

or hold the copy quantity key down. The maximum ‘number’’of-&-pi& is ,9. .,.,

. “O” will make

a singlecoPY.

,..~,..- . :

@ Toam~e~~&oli9ht or dark originals.

NO**~y~ttO*e cenmr position.

. . *t

&,.DARK +:*km.~e COPY.

. Set to

L1’GHTtoli@*n~~e coPY.

@ ~=Wfi~keY when the green light indicates that

-@&&--

‘---@ Joidarea

—————

—-—...

~ (approx.(gmm), 3/8”)

–6–

[4] SUPPLIES

1. Drum ~~idm, TD ~Wid~

TD cartridge

. .

L . . .

● Life

Storage conditions

Description

Product name

Approx. (temperature and humidity)

Drum canridge x 1

8,000

Instructions x 1

~-50DR

copies

t“ ----

TD cartridge

For USA

ExceptUSA

x 1, (including

Blink ZT-50TD1

ZT-500Cl

devdoper and

ZT-50TD2

ZT-50D

toner)

JIye ZT-50TD3

ZT-50

Brown

ZT-50TD4

ZT-50DC4

DE$ % .U

–St

4or

.x 3,W0 ~pias for black (2,700 mpies for color) for

● These are estimates only, life will vary depending on

A4 or letter size with 5% toned area.

actual usaaga.

NOTE: How to identify the lot

number

(TD ~rtridge)

xl.

Developer kind

Serial number

Last digit of production year 6–1986

‘\

Production month (1, 2,3, ....0, X, Y)

Black developer (JAPAN)

5. Blue developer Black developer (EXPORT) 6. Brown developer Red developer

O. No classification

Lot number

MG roller

(Drum =~ridge)

%me as TD urtridge.

A rtnumber

L-

Rear frame side of the drum cartridge

–7 –

z–s

2. Replacingthe drum @rtrid@

T“r” power offa”d OPe”thefro”t cover

@ Press down on the catch and pull out the TD cartridge.

Lock lever

TO ~rtrid~

Front cover

@ Move the original table to the left, andpress the uPPer

frame release button to open the copier.

Upperframe ralmw button

@ Grasp the handle of the drum cartridge and pull the

drum cartridge out.

NOTE: Thedrum cartridge cannot beremovedorinwned

unlessthe upper frame is open.

Remove the protective cover from the new drum

cartridge.

Push in the drum cartridge all the way

in, then CIO*

the upper frame.

.;.

“’ . ,

. .:

.: -, ,

-..—

/iy

.x .c...,2 ,r”;t!.,.,.%..

——...._...-—..- .. . . .

T-

....... ...... ... . ....----

—---.-—.—-

--- --

A. A.-

-—

Insert the TD cartridge, then close the front cover. !. ; ‘ ~ .

Turn power on and make sure that the DRUM r-

—..—-

~:=,..

placement lamp is extinguished.

-..--..—-__.:”——.

‘“,

---

.....

.. ...

‘..

.’

%Tt’..a:a:?::..:. .

–“8 –

z–m

[51COMpONENT LOCATION

1. External

Operation panel

@ Original cover

Front cover open button (paper entrv side)

@ POWER switch lever

@ Manudfeedgutie

@ Powersupplycord

Qmvinghandk(wperentwtide)

@ colorcheckw~dow

@ Etittray

)

@ Businesscard release lever

2. Open view ?

Drum cartridge

@ Cleaning lever

Upper frame release button

@ Fuser

@ Transfer corona unit

@ Fuser accessinglever

~ Transfer corona cleaner

–9–

Z–N

...,—---- .

3. Front frame side

CLR PWB

@ Drum ca~ridge

@ Clea”i”g lever

@ To”er alletiion co”@i”er

TD cartridge

Doorswitch

(interlined for the main switch)

4. Rear frame side

0’(

Table start position sensor [M=)

@ ;~~;~~l~e~j~;~;;;rrun

~ %nsorati”atorarm

High voltaw transformerunit (MTHVG)

@ Powertransformer

Main PWB

@ Powerswitch lever

{

–lo–

—,. -..-,. .—..-.-.--,-,--

--.=

5. Crosssection

Z–M

Discharge lamp

@ Copy lamp

Main corona

@ SELFOC lens

@ Auto exposure sensor

@ OPC drum

~ TD cartridge @ MG roller

@ Toner concentration” sensor

@ Paper entry sensor (MS 1)

Manualfeedpaparentry sensor

o (MS ~)

@ PaperfeedrollerB

@ Paperfead roller A

@ ps plate

Cassettepaper feed solenoid (PFS)

@ Transfer corona

Q Separation roller

@ Lower heat roller

@ Heater lamp

@ Upper heat roller @ Paper exit sensor (MS 2)

Thermistor/thermal fuse/thermal

breaker

@ Cooling fan (main motor driven)

–11–

z–%

. Switch, sensor,solenoidlo~tions

Name

MS 1 Ms 2 MS 3 MS 4 MS 5 MSW

DVSW

Toner sensor

AE sensor

Thermistor

Thermal breaker

PSF TFS TRS

Type Switch

Switch Switch

Microswitch Microswtich

Switch

Microswitch

Magnetic sensor

Photosensor

,,.

Thermistor

Thermal rasat . .‘ ~

Solenoid

,“‘i ,..;.

. .

e.. ., . ..

Solenoid ‘“’ “~~;:.

. . .;

Solenoid

7. Motor, transformer, lamp locations

Symbol

MTHVG

DL CL HL

Function

Paper entry sensor

Paper exit sensor .:Manual faad paper entry~sansor

Table mafi-~sition.~’~~’~~.---~~~,. ~.. .

.-.—...- --

——.+—. .

. . .

~-+ —-—---- -... ....—

Table home/ovarmn posmion sen~.,~=-=- ~~LŠ---

‘ /’

Power switch-’- ----+1,.=- ,,

Sensesi~llation,of-~e TD’,’~.tigs in tie copier.If the TD cartridge is not

g:~:~:h:.rn,:rga< s .

. m+o~~e ~uss po~r isnot sug~lied to the main

Name

Main motor

Toner motor

Powar transformer

Main and transfer high

voltage units

Discharge lamp

Copy lamp

Heater lamp

Function

..,- .. ,,,. , !

Main drive motor

alsodr.n the cooling fan.

. .. . . .

Tonar supply motor ..

“ ...4, ~.~....

Powartransformer. . .

.,. -- ‘;.

Maincoronaandtiansfarcorona

high voltage supply units

For remml Of ‘-tiual ~ on tha drum surface

if. 2?4,>;

For exposure of original. . :.. For heat roller heating:: ;:G ,

[61COPYpROcE~

2. Exposure

1. *sic mpy process

Light from the copy lamp, reflected from the original, is

Copyprocess

projected onto the drum surface through the SELFOC

lens.

1.Charge

The resistance of the OPC layer decreases for the area

A uniform negative charge is applied to the OPC drum

exposed by the light (corresponding to the light area of the

surface by the main corona.

Originaltable

‘ainmrona~$j

NWative

8. Discharge

Prior to charge, light from the discharge lamp is projected over the drum to reduce electrical resistance of the OPC layer and remove any residual charge to evenly neutralize the drum surface.

Discharge lamp

‘o

original). The light neutralizes the negative charge. The dark areas of the original do not reflect the light and an electrostatic latent image is formed on the drum surface.

~~4

Copy lamp-

\ /

Selfoc lens

T ve

Remove any residual

lamp

........... .

7. Cleaning

Residual toner on the drum surface is collected by the cleaning blade.

\ I

- - --

Latent imWe

B. Copy process flow

Main highnltege unit

Main wrens

Di=hane lamp

Wtie toner wlletiion

C. Functional diagram

SWration roller

bwer heat roller

“

1’

–13–

--/

~.,... .....:,-

/eloping

?ctrostatic latent image in the drum surface is coninto a visible image by the toner.

TD canri@e

(

MG roller

)

Toner

Dwelopar

4. Trantier

The visible image on the drum sufiace is transferred onto the copy paper by applying a negative charge from the transfer corona to the back of the copy paper.

Paper

\ Transfer corona )

5.¶tion

The paper is separated from the drum by the remover tape

and the separation roller.

~ I \ k. /

T-” .,*

6. Fusing

Through a mmbination of heat and pressure, the image is fused into the copy paper.

Lower heat roller

–14–

z–x

imageforming processsteps

Image forming: A charge is applied to the drum surface by the main corona, and the image of the original is exposed by the COPYlamp. The charge in a light image area is dissipated according to the degree of density to form a visible image on the drum surface with toner. Step-1:

Step-2:

Step-3: Step-4:

Step-5:

Step-6:

Step-7:

Optical discharge

Residual charge on the drum surface is removed.

Charge

Latent image is formed on the drum. Exposure Developing Latent image formed on the drum is then developed into a visible image with toner.

Transfer The visible image (toner image) on the drum is

transferred onto the copy paper. Cleaning Residual toner on the drum surface is collected by

the cleaning blade.

Optical discharge Residual charge on the drum surface is remoyed.

3. Description of process

Step-1: Optical discharge (by the discharge lamp) Prior to charge, light from the discharge lamp is projected over the drum to reduce electrical resistance of the OPC layer and remove any residual charge to evenly neutralize

the drum surface. As the electrical resistance is decreased,

the positive charge in the aluminium layer moves to neutralize the negative charge present in the OPC layer.

Dischargelamp

Step-2: Charge A uniform negative charge is applied over the OPC drum surface by the main corona unit.

Step-3: Exposure (copY lamp, SELFOC lens) Light from the coPy lamp, reflected from the original, is projected onto the drum surface through the SELFOC lens. The resistance of the OPC layer decreases for an area exposed by the light (corresponding to the light area of the original). The light neutralizes the negative charge. The dark areas of the original do not reflect the light and an electrostatic latent image isformed on the drum surface.

SELFOC Ians

—

Exposure (COpylamp)

! , , 1

II [1 [11

Drum sutiace charge

aftar the exposure

OPC layer

~Pigment

~la~er

++++++

~ _Aluminium

IaVer

Imaga area

Half-tone Non-image area area

Step-4: Developing (–230V DC bias) The electrostatic latent image in the drum surface is converted into a visible image by the toner. A bias potential of

-230V is applied to the carrier (MG roller) in this two component magnetic brush developing method, and the toner is charged positive through friction with the carrier.

O : Carrier (magnetized particle)

●: Toner (charga positive by friction)

(N) (S) : parmanent

magnet

(provided in three locations)

!,,

.,,

.: -., ,, -- -

... - -—

-—

+++

{

–15–

r... .......... ~-,Lv .

z–x

-700’

Image area

–600’

~1/

“1

p charge &Expos”re_DeveloPin9 -Transfer~i~ch~~harge

— Time

~Area

Toner is not attracted to the non<mage areason the drum because of the developing bias. Thus, if thedeveloPin9 bias

were to fail, the residual charge would attract the tonerso

that a background would appear in the non-image areas of the coPy.

Step-5: Transfer The visible image on the drum surface is transferred onto the

COPY paper by applying a ne9ative charge from the

transfer corona to the back of the copy paper. As the transfer effect is 70 to 80%, 20 to 30% of the image

remains on the drum (residual toner) even after the transfer.

Step-6: Cleaning Toner remaining on the drum is collected by the cleaner blade and stored in the toner collecting container.

Cleaner

Residual toner

Step-7: Discharge (same as Step-1)

Step-8: The transferred image is fixed permanently on the copy paper by the action of the fuser unit through a

combination of heat and pressure, the toner is fused into the

COPY paper.

4. Photocondu~or

An OPC drum is used for the photoconductor. (Structure of the OPC drum

layers)

OPC layer

=(1 7 ~i~ron~ thick)

. ... .,.. ... ,.. .

.. .....

............ ......

‘.,.. ......

....

‘“::’ ‘_Pigment Iaver (0.2 to

0.3 microns thick)

_Aluminium drum

.. . .......... ,--

z–s

[7] PAPER FEED AND TRANSPORT SECTION

1. Papertransport route and operational description

P.pertr.nspOrtro.*e

paper

Paper feed roller C

~aper fed roller

General Description:

Copy paper is introduced into the copier in one of two ways, from the supply of paper in the cassette or manually through the by-pass. The cassette holds approximately 100 sheets of COPYpaper. The cassette supplied with the copier may be loaded with

either 81/2 x 11” (A4) or 51/2 x 81 /2” (A5) copy paper, The Separator Tabs in the cassette ensure that only one sheet is fed at a time. The copy paper is fed out of the cassette by the Paper Feed Roller A. These roller make one rotation for each sheet of paper. The rotation of the feed rollers is controlled by the

Paper Feed Clutch (a Sprjng Clutch) and Paper Feed

Solenoid. When the Print Button is depressed, the Main

PWB energizes the Paper Feed Solenoid (pFS). When the solenoid arm retracts, it releases the spring clutch and allows the Paper Feed Roller A to make one(l) rotation. The rotating Paper Feed Rollers pick up the top sheet of copy paper and start the paper moving into the copier. The

COPY paper is transported to paper feed roller B and

trips the paper entry sensor MS1. Paper feed roller B con.

tinues to rotate until the lead edge of the copy paper contacts the paper stopper plate. The PSsensor block (located on the original table) lifts the paper stopper plate and allows the coPy paper to continue through the paper guide to paper feed roller C. The copy paper passesbetween the transfer corona and the drum and the image is transferred to the copy paper. The

remover tape strips the COPY paper

from the drum and the separation roller transports it to the fuser rollers. The fuser rollers transport the copy paper, tripping the exit sensor MS-2, to the exit tray.

During manual feed the inserted paper actuates the manual

feed paper entry sensor MS-3 and the main motor turns ON. The paper is then transported by paper feed roller B until the lead edge contacts the PS plate. The rest of the paper transport operation is the same asdescribed for the cassette feed. There is no need to push the print switch during the

manual feed operation.

paper feed roller A

feed

trav

The following discussesthe cassette feed and manual feed operations. A. Operation during cassette feed

@ The illustration below

shows the relationship be~een

paper feed roller A, paper feed clutch sleeve, and the paper feed latch locations when the copier is at an

initial state before the PRINT switch is pressed and after the READY lamp is ON.

(The paper feed latch is in contact with the clutch

sleeve protrusion. )

paperfeadlatc~ apaPerfe@ rollerA

Paper

Paper feed frame

Paper feed gear

\ f

\II / ClutchsPrin~

II IIB-@ I /

*$;’P

Paper feed roller A

Clutch sleeve

protrusion

Spring-clutch

(

–17–

,:.,.-

.-..IL

)

,-,

At the moment the PRINT switch is pressed,the drive motor starts to turn the drive gears. The paper feed

gear also starts to be driven, but the rotation of the

gear is not conveyed to the paper feed roller shaft and the paper feed roller does not rotate becausethe paper feed latch is holding the clutch sleeve protrusion.

~ Rotating section

Paper feed frame

Paper feed gear

9 r feed

Paper feed roller-A

Clutch sleeve protrusion

Spring clutch

0.9 seconds after the start of the main motor, the paper feed solenoid (PFS) actuates momentarily so

that the paper feed latch disengages from the clutch

sleeve protrusion. Now, the rotation of the paper feed gear is conveyed to the paper feed roller shaft so that paper feed roller A starts rotating to feed the

paper.

Paper feed roller A

Paper feed frame

n Rotating

Paper feed gear

section

\ / Clutch sprin9

@ Meanwhile, the paper fed into the machine is trans-

ported to paper feed roller B and the paper entry sensor (MS1 ). There, the paper is held temporarily by

means of the PS plate, in order to synchronize with the lead edW of the image on the drum. Since paper feed

roller B is continues to rotate, the paper will be evenly

pressed against the PS plate to correct for any paper

feed skew.

Tension roller

PS plate

m Paper

\ ., #

Paper feed roller A ..”

Spring clutch

~=rfed

@ As the original table starts to move, the PS plate is

mechanically raised to allow the paper to continue to

the transfer area.

PS plate release mechanism

original lead edge

Original table

PS sensor arm

\ -/ /

SELFOC lens

,. —-.—.

Lead edge of the ima9e

! PS senwr block

PSjoint plate

Drum

Lead edge of paper ,/

After the PS plate has been released, the paper is transferred to the transfer unit via paper feed roller

C. The paper is separated from the drum by the remover tape and the separation roller.

Paper

Tension rollef

Drum

)

Remover tape

Separation roller

Transfer corona

@ AfierpaperfeedrollerAmakesonefullturn,

the clutch sleeve protrusion is again caught by the paper feed latch so that paper feed roller A stops rotating.

–la–

The paper separated from the drum is transported to the exit tray through the fuser paper guide, fuser heat

roller, and the paper exit sensor (MS2) The following shows the timing chart for the above operation.

PRINT switch

(Psw)

depression

Main motor

(MMR)

, ‘ ~

rotation

“ina’tab’a~ “’ina’tab’e

‘:’’;:’)=’’’’”e

B.Operation during manual feed

@ When paper is inserted in the manual paper feed tray,

MS3 is actuated and the main motor starts to turn the drive gears. The paper inserted is then taken up by paper feed roller B and is transported until its lead edge comes in contact with the PS plate. The rest of the copy paper operation is identical to the cassette feed operation

described in: (A- @ - @ ) The following shows the timing chart for the above operation.

Manualfaed

paper entry

sensor(M~)

READY

lamp (RPL)

“~

Papar entry

sansor(MSI)

Original table

faed

PS plate n

t—About 14 seconds—q

Paper detect

.,;,

C. Condition to establish a paper misfeed

-.’

At power on

;

If MS1 or MS2 ison at power on.

Manual paper feed

If the MS1 were to fail to actuate within 3 seconds

after the actuation of the MS3.

In the course of copying

If the paper lead edge does not actuate MS2 within

2.3 seconds from the first actuation of MS5 after the table started to advance.

If MS2 is still actuated in 1.4 seconds after the discharge lamp turned off at the last copy in the single copy or multicopy mode.

If MS1 is not actuated at the timing that the PFS turns on, during cassette paper feed.

2. Major component removal A.

Paper feed unit

@ Turn the copier OFF and disconnect the power cord

from the wall outlet.

@ Open the upper frame, disconnect the paper feed

solenoid connector, remove the paper feed unit holding

screws (A - D). Loosen screw E, and remove the paper feed unit.

Transfer corona unit

READY lamp atiuatiofl

Main motor

rotation

Paper detect

Original tabla

feed

PS plate release

Paper detect

–19–

B. Transferguide,transfercoronaunit

Remove the paper feed unit (A-o).

@ Remove the two transfer guide tension springs from

the paper feed unit, then remove the transfer guide.

@ Remove the three transfer corona securing screwsfrom

the paper feed unit, then remove the transfer corona

unit.

Papar feedrollerA

paperfeedroller B

Transfer guide

Tran~fer corona unit

Transfer guide tension spring

C.Paperfeed rollers, A, B, C

@ Remove the paper feed unit (A-@).

@ Remove the transfer guide and the transfer corona unit

from the paper feed unit (B-@thru @).

● This is done to prevent breaking the corona wire.

Remove the E-ring, spring clutch unit, and bushing

from paper feed roller A. Then remove paper feed

roller A. Note that adjustment is required when replacing. Remove the E-ring, gear, pin, and bushing from paper

feed roller B. Then remove paper feed roller B.

Remove the E-ring, gear, pin, and bushing from paper

feed roller C. Then remove paper feed roller C.

Paper feed roller B

D. Remover tape

@ Open the upper frame, then remove the TD cartridge

and the drum cartridge. @ Remove the separation unit from the drum cartridge. CAUTION: Do not expose the drum cartridge to direct

sunlight.

Separation unit

@ Remove theremovertape from the separation unit.

E. Removal of the MS2 @ Remove the ACCURIDE fixing screwS (2 ‘crews) and

remove the table unit.

Original cover

\;~

‘ “

‘1

“%> ,

...”\

Rear frame side

>..

: ~

ACURI DE rail

‘ ti.

.-;:$ “...,..

‘->

. ..... >-,.,,,,

.. ~

,,/.’

~y~

A /

,,;[,1

,., i

,“’’;>*

@ Remove the covers.

. ,>;ear‘rame

/A .&

,Lower

Table Cover

- tipy Exit Side cover

Disconnect the following 4 connectors: main ~B 34

pin connector, high voltage PWB 5 pin connector, the FASTON connector and the high voltage PWB 3 pin connector. Cut the tywrap. (Take care not to cut any lead wires. )

Remove the 2 screws holding the PWB box assembly

in place.

Remove the 3 screws holding the main motor in place.

–m–

.>-,.. ....

z–%

Disconnect the 6 pin connector which is connected to

....,.,{.,

-------

3. Adjustments

the relay PWB, then remove the main motor.

~elay PWB

A. Paper feed roller A lo~tion (angle)

(Check procedure)

@ Remove the paper feed unit from the copier (2-A-@).

/’ \\.

@ Turn gear inthe arrow direction unitilthe cl”tch sleeve

PWB Bo; Assembly

Main Motor

Disconnect

the MS2 2 pin connector which is attached to the relay PWB. Press on MS2.

,,/

both sides of MS2 fixing hook and remove

Relay PWB

F. RemovaloftheMSI andMS3Units

@ Open the Upper frame and remove the rear cover and

the paper feed side cover.

@ Disconnect the4pin connector onthe rear frame side.

@ Disconnect the lock catch of MS1,3 units from the

frame and Iifi out the units.

●

When MS1, 3 units are removed, the manual feed arm which isconnected to MS3 will be disconnected.

/ \

protrusion comes into contact with the paper feed latch. Make sure that the lower side of paper feed roller A is parallel to the lower side of the paper feed frame. The tolerance is O* 5°.

Gear A

n Paperfead roller A

(ie b

(View of the paperfeed unitfrom the rearframe side)

(Adjustment procedure)

@ Check the angle of paper feed roller A. @ Change the hook position of the clutch spring accord

ing to the degree of angular deviation.

View from the rear frame side

Viw from the rear frame side

a e’

@c’’’’’evQ

Changathe spring hook

Change the spring hook ~~’

position from C to B or A.

position from C to D or E.

Manual Feed Arm

●

–21–

~-a Remove the spring clutch assy (2-C-@-a). ~ @-b Disassemble the spring clutch assy and change the $

hook position of the spring.

i t.:

Clutch spring

27T gear

\ ?

Clutchboss ‘

-&p-&# ;

Reference holeC

Clutchsleeve

.,J

When reassembling the clutch, lube the clutch spring

with grease (U KOG-0062FCZZ).

I ,

+ 51 hidden pages

Sharp Z-50 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual