Minolta 1052 General

EPlO52

-

GENERAL,

MECHANICA

ELECT

MINOLTA

RICA

1158SBGOOOBA

CONTENTS

SPECIFICATIONS

1.
PRECAUTIONS FOR INSTALLATION

2.
PRECAUTIONS FOR USE

3.
HANDLING OF THE CONSUMABLES

4.

5.

SYSTEM OPTION

1158SBMOOOBA

1

MECHANICAL/ELECTRICAL

CROSS-SECTIONAL VIEW

1.
COPY PROCESS

2.
DRIVE SYSTEM

3.
SEQUENTIAL EXPLANATION

4.
PC DRUM

5.

IMAGINGUNIT .............................................

6.
6-l. Imaging Unit Drive
6-2. Toner Recycling
6-3. I/U Fuse F4

DEVELOPMENT
7-l. ATDC Sensor
7-2. Magnet Roller
7-3. Developing Bias
7-4. Doctor Blade
7-5. Magnet Roller Lower Filter
CLEANING UNIT
8-1. Cleaning Unit
8-2. Cleaning Bias

TONER HOPPER
9-l.
9-2.
9-3.
9-4.
9-5.
9-6.

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

Toner Hopper Locking/Unlocking
Toner Replenishing
Shutter
Toner Hopper Home Position Detection
Toner Bottle Vibration
Toner Replenishing Control

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1

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

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

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

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

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

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

G-l
G-4
G-5

G-6
G-7

M-l
M-2
M-4
M-5
M-10

M-11
M-12
M-13
M-13

M-l 4
M-15
M-17
M-18
M-19
M-19
M-20
M-20
M-21

M-22
M-22
M-22

..M-2 3

M-23
M-24
M-25

i

CONTENTS

10.

DRUM CHARGING

11. IMAGE ERASE LAMP

12. OPTICAL SECTION
12-1.

Exposure Lamp LA1

12-2.

AESensor............................................M-3

Lamp Reflectors

12-3.
12-4.

Aperture Plates

12-5.

1

st/2nd

12-6.

4th Mirror Movement

12-7.

Lens Movement

13. MAIN

14. IMAGE TRANSFER AND PAPER SEPARATION

15. PAPER SEPARATOR FINGERS

16. PAPER TAKE-UP/FEED SECTION

17. VERTICAL PAPER TRANSPORT . . . . . . . . . . . . n . m , . m . . . . . . . , . . , M-52

ERASE LAMP

16-1.

Edge Guide and Trailing Edge Stop
Drawer Positioning

16-2.

16-3.

Paper Lifting Plate
Drawer-in-Position Detection

16-4.
16-5.

Universal Tray Paper Size Detection

16-6.

Paper Empty Detection

16-7.

Paper Separating Mechanism

16-8.

Paper Take-Up Roll

16-9.

Paper Take-Up Retry Control

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

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

Scanner Movement

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M-26

M-27
M-30

M-31
M-33

M-33
M-34
M-36
M-37

M-38
M-39
M-41
M-43

M-44
M-45
M-45
M-46
M-47
M-48
M-49
M-50
M-51

2

-

18. SYNCHRONIZING ROLLERS
18-l. Upper Synchronizing Roller Positioning

18-2. Paper Dust Remover
18-3. Synchronizing Roller Drive

19. PAPER TRANSPORT

20. FUSING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . M-57

20-l.

Fusing Temperature Control

20-2.

Fusing Rollers Pressure Mechanism

20-3

Oil Roller/Cleaning Roller

21

m

EXIT

UNIT

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

21-1,

Upper/Lower Separator Fingers

21-2,

Paper Exit Sensor

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

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

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

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

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

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

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

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

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

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

M-53
M-54

M-54
M-55

M-56

M-58
M-59
M-59

M-60
M-60

M-61

ii

-

CONTENTS

22. DEHUMIDIFYING SWITCH (OPTION)

23. MULTI BYPASS TABLE MB-4 (OPTION)
23-1. Paper Take-Up Mechanism
23-2. Paper Separating Mechanism
23-3. Paper Empty Detection

24. COOLING FAN

25. OPTICAL SECTION COOLING FAN

26. MEMORY BACKUP

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M-62
M-63

M-64
M-66
M-67

M-68
M-69

M-70

/-MEMO

GENERAL

1158SBGDlOOA

SPECIFICATIONS

)

TYPE
PHOTOCONDUCTOR :
COPYING SYSTEM

PAPER FEEDING
SYSTEM

EXPOSURE SYSTEM
DEVELOPING SYSTEM
CHARGING SYSTEM

IMAGE TRANSFER
SYSTEM

PAPER SEPARATING

SYSTEM
FUSING SYSTEM

PAPER DISCHARGING

SYSTEM

MAXIMUM ORIGINAL
SIZE

COPY MEDIUM

Plain paper

,_
B

z

E

=

(60 to 90

Translucent paper

.

Transparencies

(91 to 157

Recycled paper

g/m2)

Thick paper

g/m2)

Desktop (with Stationary Platen)
Organic Photoconductor
Electrostatic Dry Powdered Image Transfer to Plain

:

Paper
2-Way Feeding Paper Drawer: Universal Tray

:

Manual Bypass Table

Mirror Scanning, Slit Exposure

:

Minolta New Micro-Toning System

:

Comb Electrode DC Negative Corona with Scorotron

:

System
Visible Image Transfer by means of a Single-Wire DC

:

Negative Corona with Corotron System

Single-Wire AC Corona with Corotron System, plus

:

Paper Separator Finger

:

Heat Roller

:

Charge Neutralizing Brush

Metric-A3L; Inch-l

:

(Automatic feeding) (Single-sheet feeding)

1

x

17L

Paper Drawer

0 0

-

-

0 0

(250 sheets of paper)

(L: Lengthwise)

Manual Bypass

0
0

0

:

*-

2
E

I_

0

0: Permissible

(Width Maximum x Length)

(Width x Length)

Minimum

X: Not permissible

297x432 mm

140x182mm

G-l

297x432 mm

100x140 mm

MULTIPLE COPIES

WARMING-UP TIME

FIRST COPY TIME

:

1to99

:

30 sec.

or less

power voltage

:

A4C

or 8-l

(in

Full size Mode using 1 st Drawer)

with

room temperature of

/2

x 11 C: 7.2 sec. or less

20C

and rated

CONTINUOUS COPY SPEED

A3L

Metric

w

L: Lengthwise; C: Crosswise

ZOOM RATIOS

A4L
A4C

B4L

Full Size

Fixed

Variable

LENS
EXPOSURE LAMP

Reduction

Enlargement

50%to

FUSING

TEMPERATURE

(copies/min.):

Europe (Metric) Taiwan (Metric)

200% (in 1% increments)

:

Through Lens (F = 8.0, f = 180 mm)

:

Halogen Frost Tube Lamp

:

195C

Fed from Drawer

Inch

100% 100%

81% 81%

70%
50% 50%

115% 122%
141% 141%

200% 200%

11" x 17" (L)

8-l/2"

x

8-l/2"

5-l/2"

11"(L)

x

11"(C)

x 8-1/2"(L) 15

70%

x1.00

11
15
15

Inch

100%

78%
64%
50%

121%
129%
200%

G-2

POWER/CURRENT CONSUMPTION (Copier Only)

Exposure

Voltage

115V

120v

127V
220 v

240 V

POWER
REQUIREMENTS

ENVIRONMENTAL CONDITIONS

Temperature
Humidity
Ambient Illumination
Levelness

Lamp

(Rating)

80 V

225 W

160V

240 W

Fusing
Heater

Lamp

(Rating)

115/120

900 w

115/120

900 w

220/240

900 w

:

115V,120V,127V,220V,240V;50/60Hz

)

10 to 35C with a fluctuation of 10C or less per hour

1

15 to 85% RH with a fluctuation of 10% RH or less per hour

1

3,000

lux

or less

I lY1.75 mm/l 00

Max. Power

Consumption

v

1180

1220

V

1290

V 1195

1270

mm)

In Standby Current

W

w
w
w

W

935 w
965 W

1070 w

930 w

1060 W

Max.

Consumption

10.4A

10.4A

5.6 A

I

I
I

I
I

DIMENSIONS
(Copier Only)

WEIGHT

STANDARD
ACCESSORIES

Width . . . . 610

Depth . . . .

mm

632.5 mm

Height . . . 401 mm (including Original Cover)

51 kg (excluding the Manual Bypass Table, starter,
toner, and paper)

Operators Manual

*I,

Setting-up Instructions, Starter**, Copy

Tray, Manual Bypass Table, Auxiliary Cap

1: Except Europe and Taiwan

*2;

Europe only

G-3

1151Si3G0200A

PRECAUTIONS FOR INSTALLATION

1

I InstallatCon

Site

To ensure safety and utmost performance of the copier, the copier should NOT be
used in a place:

0

Where it will be subject to extremely high or low temperature or humidity.

0

Which is exposed to direct sunlight.

0

Which is in the direct air stream of an air conditioner, heater or ventilator.

0

Which puts the operator in the direct stream of exhaust from the copier.

0

Which has poor ventilation.

0

Where ammonia gas might be generated.

0

Which does not have a stable, level floor.

0

Where it will be subject to sudden fluctuations in either temperature or humidity.

If a cold room is quickly heated, condensation forms inside the copier, resulting in
blank spots in the copy.

0

Which is near any kind of heating device.

0

Where it may be splashed with water.

0

Which is dirty or where it will receive undue vibration.

0

Which is near volatile flammables or curtains.

H

Power Source

Use an outlet with a capacity of

115/l

20/l

27V, 13.2A

or more, or

200/220/24OV,

8.1 A
or more.

0

If any other electrical equipment is

sourced

from the same power outlet, make sure

that the capacity of the outlet is not exceeded.

0

Use a power source with little voltage fluctuation

0

Never connect by means of a multiple socket any other appliances or machines

to the outlet being used for the copier.

0

Make the following checks at frequent intervals:

l

Is the power plug abnormally hot?

l

Are there any cracks or scrapes in the cord?

l

Has the power plug been inserted fully into the outlet?

l

Does something, including the copier itself, ride on the power cord?

0

Ensure that the copier does not ride on the power cord or communications cable

of other electrical equipment, and that it does not become wedged into or under­neath the mechanism.

1

Grounding

To prevent receiving electrical shocks in the case of electrical leakage, always ground
the copier.

l

Connect the grounding wire to:

l

The ground terminal of the outlet.

l

A grounding contact which complies with the local electrical standards.

0

Never connect the grounding wire to agas pipe, the grounding wire for a telephone,

or a water pipe.

G-4

1151 SSG0300A

PRECAUTIONS FOR USE

To ensure that the copier is used in an optimum condition, observe the following pre­cautions.

0

Never place a heavy object on the copier or subject the copier to shocks.

0

Insert the power plug all the way into the outlet.

@

Do not attempt to remove any panel or cover which is secured while the copier is

making copies.

0

Do not turn OFF the Power Switch while the copier is making copies.

0

Provide good ventilation when making a large number of copies continuously.

0

Never use flammable sprays near the copier.

0

If the copier becomes inordinately hot or produces abnormal noise, turn it OFF and

unplug it.

0

Do not turn ON the Power Switch at the same time when you plug the power cord

into the outlet.

0

When unplugging the power cord, do not pull on the cord; hold the plug and pull

it out.

0

Do not bring any magnetized object near the copier.

l

Do not place a vase or vessel containing water on the copier.

0

Be sure to turn OFF the Power Switch at the end of the workday or upon power

failure.

0

Use care not to drop paper clips, staples, or other small pieces of metal into the

copier.

n

Operating Environment

The operating environmental requirements of the copier are as follows,

l

Temperature: 10C to 30C with a fluctuation of

l

Humidity: 15% to 85% RH with a fluctuation of

10C

10%

RH per hour

per hour

H

Power Requirements

The power source voltage requirements are as follows.

l

Voltage Fluctuation:

AC1

15/l

20/l

27/220/24OV

f

10% (Copying performance assured)

-15% (Paper feeding performance assured)

l

Frequency Fluctuation:

50/60

Hz

-+0.3%

G-5

1151SBG0400A

HANDLING OF THE CONSUMABLES

Before using any consumables, always read the label on its container carefully.

0

Use the right toner. The applicable copier model name is indicated on the Toner

Bottle.

1

l Paper is apt to be easily damaged by dampness. To prevent absorption of

moisture, store paper, which has been removed from its wrapper but not loaded
into the Drawer, in a sealed plastic bag in a cool, dark place.

0

Keep consumables out of the reach of children.

0

Do not touch the PC Drum with bare hands.

0

Store the paper, toner, and other consumables in a place free from direct sunlight

and away from any heating apparatus.

0

The same sized paper is of two kinds, short grain and long grain. Short grain paper

should only be fed through the copier crosswise, long grain paper should only be

fed lengthwise.

0

If your hands become soiled with toner, wash them with soap and water

immediately.

0

Do not throw away any used consumables (PC Drum, starter, toner, etc.). They are

to be collected.

NOTE

Do not burn, bury in the ground, or throw into the water any
consumables (PC Drum, starter, toner, etc.).

G-6

1158SBG0500A

11420010AA

1. Multi

Bypass

Table MB-4

G-7

MECHANICAL/

ELECTRICAL

1158SBMOlOOA

CROSS-SECTIONAL

234 5

VIEW

6 7 6

1

9

10

L

'

14

15

,,/

/

16,

1.

3rd Mirror
2nd Mirror

2.

3.

1st Mirror

4.

Exposure Lamp LA1

5.

Lamp Reflector

6.

Lens

7.

Cleaning Blade
PC Drum Charge Corona

8.

9.

Image Erase Lamp LA3
4th Mirror

10.

PC Drum

11.

12.

Sleeve/Magnet Roller

17

/

13.

14.

15.

16.

17.

I

16

Synchronizing Roller
Transport Roller

Paper Take-Up Roll
Drawer
Image Transfer/Paper Separa-

1158MOOlYB

tor Coronas

18.

Suction Unit

19.

Cleaning Roller

20.

Oil Roller

21.

Upper/Lower Fusing Roller

22.

Paper Exit Roller

M-l

1158SBM0200A

COPY PROCESS

1.

PC DRUM

2.

DRUM CHARGING

3.

IMAGE ERASE

4. EXPOSURE

5.

DEVELOPING

6.

PAPER FEEDING

7.

IMAGE TRANSFER

1

6.

PAPER SEPARATION

9.

CLEANING

10.

MAIN ERASE

Il.

TRANSPORT

12.

FUSING

13.

PAPER EXIT

I

1139M002AA

1. PC Drum

The PC Drum is an aluminum cylinder coated with a photosensitive semiconductor.
It is used as the medium on which a visible developed image of the original is formed.

(For more details, see p. M-l 0.)

2. Drum Charging

The PC Drum Charge Corona Unit is equipped with a Comb Electrode and a Scorotron Grid to

deposit a uniform negative charge across the entire surface of the PC Drum.

(For more details, see p. M-26.)

3. Image Erase

Any areas of charge which are not to be developed are neutralized by lighting up

(For more details, see p. M-27.)

LEDs.

4. Exposure

Light from the Exposure Lamp reflected off the original is guided to the surface of the PC
Drum and reduces the level of the negative charges, thereby forming an electrostatic latent
image.

(For more details, see p. M-30.)

5.

Developing

Toner positively charged in the Developer Mixing Chamber is attracted onto the electrostatic
latent image changing it to a visible, developed image. A DC negative bias voltage is applied
to the Sleeve/Magnet Roller to prevent toner from being attracted onto those areas of the PC
Drum which correspond to the background areas of the original.

(For more details, see p. M-l 4.)

6. Paper Feeding

Paper is fed either automatically from the 1 st or 2nd Drawer, or manually via the Manual
Bypass Table. The Drawer has fingers that function to separate the top sheet of paper from
the rest at take-up.

(For more details, see p. M-43.)

7. Image Transfer

The single-wire Image Transfer Corona Unit applies a DC negative corona emission to the
underside of the paper, thereby attracting toner onto the surface of the paper.

(For more details, see p. M-30.)

8. Paper Separation

The single-wire Paper Separator Corona Unit applies an AC corona emission to the underside
of the paper to neutralize the paper. In addition, mechanical paper separation is provided by
the two PC Drum Paper Separator Fingers fitted to the Imaging Unit.

(For more details, see p. M-30)

9. Cleaning

Residual toner on the surface of the PC Drum is scraped off by the Cleaning Blade.

(For more details, see p. M-20.)

10. Main Erase

Light from the Main Erase Lamp neutralizes any surface potential remaining on the surface of
the PC Drum after cleaning.

(For more details, see p. M-38.)

11. Transport

The paper is fed to the Fusing Unit by the Suction Belts.

(For more details, see p. M-56.)

12. Fusing

The developed image is permanently fused to the paper by a combination of heat and
pressure applied by the

(For more details, see p. M-57.)

Upper

and Lower Fusing

Rdlers.

13. Paper Exit

After the fusing process the paper is fed out by the Paper Exit Roller onto the Copy Tray.

(For more details, see p. M-60.)

M-3

1158SBM0300A

DRIVE SYSTEM

1

This copier is equipped with two main drive motors, PC Drive Motor Ml that drives
the upper half of the copier (Imaging Unit) and Main Drive Motor M2 which gives
drive for the lower half of the copier (paper take-up/feeding and transport
mechanism and Fusing Unit). Each has its own drive transmitting gears and timing
belts as illustrated below.

Drive Train for Lower Half of Copier

Paper Exit Roller Driv

Roller Drive

n Drive Motor M2

+

Coupled to Paper
Take-Up Unit

Synchronizing Roller Clutch CL

Paper Transport

Clutch CL 2

Drive Train for Upper
Half of Copier

1151MOOlVB

Drive Train for

w

Paper Take-Up Unit

Coupled to Copier Gear

Vertical

Transport Roller

per Drawer Paper



PC Drive Motor Ml

1

PC Drum Drive

1139MOO5AA

1142M002AA

1158SSM0400A

SEQUENTIAL EXPLANATION

)

*Numbers given in rectangles0

A

The power cord is plugged into the outlet.

)

Power cord is plugged in.

DC24V

for Drum heating (PU2)

Drum Dehumidifying
Heater H2

Paper Dehumidifying
Heater H3

6 Power Switch Sl is turned ON.

z

H2

ON

-

DC5V

(PWB-C)

ON

-

DC24V

(PU2)

ON

------ Control panel
ON

l

The Cooling Fan turns at full speed.
Approx. 3
Approx. 0.5

ON

c

Scanner Reference Position Sensor PC81

If the Scanner

M5 is energized to move the Scanner to the home position.

ON

+

Lens Reference Position Sensor PC90

*If the Lens is not at the home position, Lens Motor M6 is

energized to move the Lens to the home position.

ON

c

Mirror Reference Position Sensor PC86

*If the 4th Mirror is not at the home position, Mirror Motor M7

is energized to move the Mirror to the home position.

in the following flowchart are timer values in sec.

ON

~-The

ON

h

Fusing Heater Lamp Hi

is not at the home position, Scanner Motor

Only when Serviceman
Switch 53 is ON

Cooling Fan turns at half speed.

__.

Starter setup and ATDC Sensor automatic adjustment

*Only when the Imaging Unit is new.

when the starter setup sequence is completed normally.

I/U

Fuse F4 blows

M-5

C

The Fusing Unit temperature reaches 205%.

1 Fusincl

Thermistor THI detects

L-

oNoFFFusing Heater Lamp HI

*The Fusing Unit temperature control is started.

2OCPC.

1

M-6

D

The Start Key is pressed.

1

Start Key ON

ON
ON
ON

ON

ON
ON
ON

ON

1

PC Drive Motor Ml

Main Erase Lamp LA2
Main Drive Motor M2

Image Erase Lamp LA3

*All

LEDs

are turned ON.
Developing Bias (High Voltage Unit HVI)
Paper Separator Corona (HVI)
Cleaning Bias

*Some models have no Bias Seal installed depending

on their marketing areas.

Synchronizing Roller (CLI) *For approx 0.2

(HVl)

Paper Take-Up Roll (Solenoid SL2)

set

only

t=LL=b

psi=-+

E

Paper is taken up.

Paper Take-Up Solenoid SL2 ON

APProx.ON e Drawer Paper Take-Up Sensor PC55

0.4

APProx. 0.7

SL2

PC Drum Charge Corona/Image Transfer

Corona

(iv,)

Transport Roller (Paper Transport Clutch CL2)

Synchronizing Roller

ON c

Transport Roller Sensor PC51

- APProx. 3

0.5

- APProx. a

0.2

(CLl)

Paper Leading Edge

Detecting Sensor PC54

- APProx. z

0.2

Exposure Lamp LA1

Paper

Transport
Clutch CL2

M-7

APProx. ON c

0.6

Scanner Motor

OFF

c

Scanner Reference Position Sensor PC81

M5

- APProx. -

0.3

1

F 1 A scan motion is completed.

1 SCFND

signal: LOW

-

Approx.

0.3

- APProx.ON t Scanner Reference Position Sensor PC81

*For A4 crosswise, x 1 .OOO

Image Erase Lamp LA3

_

Approx. ON .

1

LEDs

*

Scanner starts return motion.

0.6

LEDs

ON/OFF

trol is started.

Synchronizing Roller Clutch

-

ON

CL1

CL2

Separator Fingers
(Separator Solenoid

0.2

of Unexposed Areas/Edge Erase Lamp LA3

con-

7-p

Exposure Lamp

M-8

LA1

G

The last paper moves past Transport Roller Sensor

PC51 OFF

7

)

0.6

T

1

Paper Leading Edge Detecting Sensor PC54

Synchronizing Roller (Synchronizing

1-p

Roller Clutch

PC Drum Charge Corona/Image Transfer
Corona (High Voltage Unit HVI)

OFF

I-

PC51.

CLl)

PC Drive Motor Ml
Main Erase Lamp LA2

Unexposed Areas/Edge

Erase Lamp LA3
Developing Bias
Cleaning Bias

*Some models have no Bias Seal

installed depending on their
marketing areas.

OFF

I-

Paper Separator Corona

iAl;p:oxp

~=Gfp_

I

H 1 The paper moves past Paper Exit Sensor PC53.

Lpqy

I

Main Drive Motor M2

Transport Roller (CL2)

Paper Exit Sensor PC53

(HVl)

(HVl)

(HVI

)

M-9

1151SBM0500A

~7ciii-l

The photoconductive drum used in this copier is the organic photoconductor (OPC)
type. The drum is made up of two distinct, semiconductive materials on an alumi­num alloy base. The outer of the two layers is called the Charge Transport Layer
(CTL), while the inner layer is called the Charge Generating Layer (CGL).

The PC Drum has its grounding point inside at its rear end. When the Imaging Unit
is installed in the copier, the shaft on which the PC Drum Drive Coupling Gear is
mounted contacts this grounding point.

Handling Precautions

This photoconductor exhibits greatest light fatigue after being exposed to light over
an extended period of time. It must therefore be protected from light by a clean, soft
cloth whenever the Imaging Unit has been removed from the copier. Further, use
utmost care when handling the PC Drum to prevent it from being contaminated.

PC Drum Cross-Sectional View

Plate

PC Drum

.

Gear

_

CTL

1139M006AA

Grounding Point

r

!iiiL--

1139MCWAA

PC Drum Drive Coupling Gear

r

M-10

1139SBhAO6OOA

IMAGING UNIT

This copier is equipped with an Imaging Unit, or IU, which integrates a PC Drum
PC Drum Charge Corona, Developing Unit, Cleaning Unit, and Toner Recyclini
mechanism into
Roller which facilitates clearing of a paper misfeed.

one

assembly. The Unit also includes the Upper Synchronizing

Corona Unit Cleaning/PC Drum
Lever

Charge Corona

Toner Supply Port

Paper Separator Fingers

Coupled to Gear
in Copier

1139MOlOAA

Paper Guide Plate

Upper Synchronizing Roller

t

1139MOllAA

1139SBM0601A

6-1. Imaging Unit Drive

Drive for the Imaging Unit is transmitted by one of the gears on the Unit.

This particular gear is in mesh with the Imaging Unit Drive Gear in the copier.

Developer Mixing Screw Drive Gear

/

Bucket Roller Drive Gear

Sleeve/Magnet Roller

Coupling (in Copier)

Toner Recycling Ceil

Drive Gears

1151

SBM0602A

6-2. Toner Recycling

The copier is provided with a toner recycling mechanism. The toner, which has been
scraped off the surface of the PC Drum by the Cleaning Blade and collected in the
Cleaning Unit, is conveyed by the two Toner Recycling Coils to the Toner Supply
Port and, from there, it is returned back to the Developer Mixing Chamber of the
Developing Unit.

One of the gears of the Toner Recycling mechanism receives drive through a gear

at the rear end of the PC Drum.

Toner

Supply Port

Toner Recycling Coil

1139M013AA

Toner Recycling Coil

1151SSM0603A

6-3.

I/U

Fuse F4

The Imaging Unit is provided with a fuse called
Unit is installed in the copier and the Power Switch turned ON, an

I/U

Fuse F4. When a new Imaging

I/U

Set signal is
output causing the copier to start the starter setup sequence and ATDC Sensor
automatic adjustment.

When the starter setup sequence is completed normally, an
is output to blow F4. Once F4 is blown, the

I/U

Set signals are no longer output. This

I/U

Fuse Blow signal

means that the starter setup sequence and ATDC Sensor automatic adjustment will
not be carried out when the Power Switch is thereafter turned ON.

When Fuse is When Fuse is

not Blown Blown

H

L

WIRING DIAGRAM

30-B

F4

Control Signal

PWB-A

PJl

A-6

M-13

1151SSM0700A

DEVELOPMENT

1

The Developing Unit built into the Imaging Unit performs the following functions:

l

Mixes the toner and carrier well to ensure that a sufficient amount of toner is

positively charged.

l

Detects the toner-to-carrier ratio of the developer by means of the ATDC Sensor

and replenishes the supply of toner as necessary.

l

Detects a toner empty condition by means of the ATDC Sensor.

l

Ensures that a proper amount of toner is attracted to the PC Drum by means of

its Sleeve/Magnet Roller, Developing Bias, and Doctor Blade.

PC Drum

Developer Mixing Screw

Sleeve/Magnet Roller

Bucket Roller ATDC Sensor

M-14

1151SBM0701A

7-1. ATDC Sensor
ATQC Sensor UN3 installed on the underside of the Developer Mixing Chamber

detects the varying toner-to-carrier ratio of the developer which flows over it in the
Chamber. The copier CPU compares the detected ratio with the ratio set by the
ATDC Detection Level Mode (Tech. Rep. Choice SCH-90) to control toner
replenishment.

Set T/C

4.0

4.5

1

ATDC Output Voltage (V)

(%)

1

2.692

1

2.596

1

I
I

Toner is replenished for 5 seconds (the Toner Bottle is turned one turn, which is
equivalent to a run of 2 copy cycles) for each Toner Replenishing signal.

If the toner-to-carrier ratio becomes lower than

2.5%,

the copier inhibits the initiation
of a new copy cycle (this feature can be enabled or disabled by a Tech. Rep. Choice
mode). When a ratio of 3% or more is recovered as a result of Auxiliary Toner
Replenishing, the copier permits the initiation of a new copy cycle.

If the Front Door is swung open and closed with a T/C ratio of less than

3%,

the copi­er initiates an Auxiliary Toner Replenishing sequence. (It stops the sequence as
soon as a T/C ratio of 3.5% is reached.)

ATDC Sensor Automatic Adjustment

An automatic adjustment of the ATDC Sensor is made in the F8 Test Mode
operation and when a new Imaging Unit is installed in the copier.

*When a New Imaging Unit is Installed in the Copier:

Following the execution of the starter setup mode upon power-up, the copier
CPU reads the output value of the ATDC Sensor and establishes the reading

as the reference value.

*When F8 is Run after Starter Has Been Changed:

Following the execution of the starter setup mode upon pressing of the Start
Key, the copier CPU reads the output value of the ATDC Sensor and establishes

the reading as the reference value.

NOTE: If an F8 operation is run at a time when the starter has not been changed,

it can result in a wrong T/C reference value being set by the copier. Avoid
casual use of F8.

If the setting value has been cleared because of the RAM Board being
replaced, however, enter the ATDC control value before the replacement
using the Zoom Up/Down Keys in the F8 operation (without pressing the
Start Key).

M-15

Toner Empty Detection

The copier has no toner empty detecting sensor and, instead, the ATDC Sensor
performs that function. The ATDC Sensor checks the toner-to-carrier ratio and, if
it reads a T/C ratio lower than the set level for 37 copies and, further, if it next reads
a ratio 1% lower than the setting, this is a toner-empty condition. The toner-empty
condition is canceled after detection under any of the following conditions:

l

The set T/C ratio has been recovered.

l

After the Front Door has been swung open and closed.

UN3

Control Signal

PWB-A PJlA-3

TIC

Standard

output

Voltage

2.692

2.596

2.404 30-B

2.308

2.116

Set

4.0%

4.5%

5.0%

5.5%

6.0%

6.5% 2.212

7.0%

WIRING DIAGRAM

2.5

M-16

1151SBM0702A

7-2. Magnet Roller

The Magnet Roller of the Sleeve/Magnet Roller of this copier has the following
magnetic characteristics. Part of pole S2 before the principal Ni pole (i.e., the area
marked as

S2b

in the Fig. below) provides a very weak magnetic force. If developer
is compacted and clogs at the Doctor Blade and, as a result, part of the surface of
the Sleeve/Magnet Roller is not covered with developer, the nearby developer
around

S2b

goes to those uncovered areas because of its weak magnetic force.

This helps prevent blank lines from occurring on the copy.
The Sleeve Roller, onto which developer is attracted by the magnetic fields of force

set up by the poles of the Magnet Roller, turns to convey the developer toward the
point of development. It also means that the developer fresh from the Developer
Mixing Chamber is always brought to the point of development.

As we noted earlier, the Imaging Unit integrates the Developing Unit with the PC
Drum into one body. Because of that, it is impossible to move the Developing Unit
against the PC Drum, thereby providing a certain distance between the PC Drum
and Sleeve/Magnet Roller. The Magnet Roller has therefore been made movable:
the Bushing is pressed by compression springs thereby pressing the Positioning
Collars on both ends of the Magnet Roller against the PC Drum. This ensures a
given distance between the PC Drum and the Sleeve/Magnet Roller.

Magnetic Pole Positioning

s2

Pole Having Weak

Magnetic Force

Compressioh

1139MOlBAA

PC Drum

M-17

1151

SBM0703A

7-3. Developing Bias

A negative voltage (Vb = Developing Bias voltage) is applied to the Sleeve Roller
to prevent a foggy background on the copy. The amount of toner attracted onto the
surface of the PC Drum depends on how much lower the PC Drum surface potential
(Vi) is than Vb (i.e., the potential difference).

l

When the potential difference is large, a greater amount of toner is attracted.

l

When the potential difference is small, a smaller amount of toner is attracted.

Because the Magnet Roller of this copier is movable,

a

flat spring is used as the Bias

Terminal which follows the movement of the Magnet Roller.

Bias Terminal

Magnet Roller

1139M018AA

Start Key

PC Drive Motor Ml

Developing Bias

I-

Developing Bias 1 PWB-A

ON

OFF

I

I

Control

PJl2A-4

Signal

Apprax. 0.5 set

1

ON 1 OFF 1 WIRING DIAGRAM

I L I H I

1151TOiMCA

30-A

1

I

M-18

1151SBM0704A

7-4. Doctor Blade

The Doctor Blade installed over the Sleeve/Magnet Roller regulates the height of

the developer brush on the surface of the Sleeve-Roller. The Blade is perpendicular

to the direction of movement of the Magnet Roller to minimize variations in the dis­tance between the Doctor Blade and Magnet Roller as the Magnet Roller moves.

Doctor Blade

Direction of Magnet
Roller Movement

1139MOl

SAA

1139SBM0705A

7-5.

Magnet Roller Lower Filter

*Except the U.S.A., Canada, and Europe
There is a slit provided under the Magnet Roller to collect insufficiently charged

toner in the grounded Toner Antispill Receiver. This effectively prevents the toner

from spilling onto the mechanisms inside the copier.

Slit

?h

1139M020AA

1139SSM0900A

m

CLEANING UNIT

1139SBM0801A

8-1. Cleaning Unit

The Cleaning Blade is pressed tightly against the surface of the PC Drum and
scrapes off any toner remaining on the surface after image transfer and paper sepa­ration have been completed.

The Cleaning Blade is moved back and forth to prevent the PC Drum from deterio­rating and the Cleaning Blade from warping away from the surface of the PC Drum.

There is a Toner Antispill Mylar affixed to the Imaging Unit. It prevents toner scraped
off the surface of the PC Drum from falling down onto the surface of the copy paper
or the paper path.

In addition, a Side Seal and Brush Seal are affixed to both ends of the Imaging Unit
on both sides of the Cleaning Blade. They prevent toner from spilling from both ends
of the Cleaning Blade.

1

Cleaning Blade
Tension Spring

\

Side Seal

Toner Antispill Mylar

&

\

/HLF

Brush Seal

/

\

/

\

Tis

\

1139M022AA

Blade Lateral

Movement Cam

M-20

1151SBM0802A

8-2. Cleaning Bias

*Except the U.S.A., Canada, and Europe
There is a Cleaning Bias Seal installed to minimize damage

to the PC Drum from

acid paper.

Toner Antispill Mylar

PC drum

Cleaning Bias Seal

Start Key

PC Drive Motor Ml

Cleaning Bias

E---n

FE=

I I

Control Signal

PWB-A

PJI 2A-4

1

OFF

H

I
I

I

-4

Approx. 0.5

set

WIRING DIAGRAM

-

ON

L

I

1151T02MCA

31-c

M-21

1151SBM0900A

TONER HOPPER

1139SBM0901A

9-1. Toner Hopper Locking/Unlocking

The Toner Hopper is not integrated into the Imaging Unit; instead, it is secured to
the copier. To replace an empty Toner Bottle, the user first needs to swing the Toner

Bottle

Holder out 40 to the front.

it is swung out

or in, which effectively prevents toner from spilling

is swung out or in.

Lock

1151SBM0902A

9-2. Toner Replenishing

l

Drive from Toner Replenishing Motor M8 is transmitted via the motor shaft to the Bottle
Cap Claw, which turns the Toner Bottle. As the Toner Bottle is fitted to the Coupling,
both turn together during toner replenishing.

l

There is a Metering Chamber provided at the toner supply port of the Coupling, It

tions to regulates the amount of toner that falls through the port.

l

There is a supply port for the exclusive use of the starter. The starter does not pass
through the Metering Chamber, which means that it takes a shorter time to charge the
starter.

Starter

Port .

SUPPlY

The Holder pivots about the Toner Supply Port as

when the Holder

Copier Frame

/

Toner Supply Port

1139M024AA

Ton&

Bottle

,

Metering Chamber

Toner Bottle Holder

lishing

func-

1139M025AA

M-22

Bottle Cap Claw

Toner Replenishing

Motor M8

1151 MO1

8YA

/

1151SBM0903A

9-3. Shutter

The connection between the Toner Hopper and Imaging Unit is provided with a
Shutter which prevents toner from spilling when the Imaging Unit is slid out of the
copier.

imaging Unit Out of Copier Imaging Unit in Position in Copier

Shutter

1139M026AA



Imaging Unit

1151SBM0904A

9-4.

Toner Hopper Home Position Detection

Coupling is fitted with a Home Position Plate which is detected by Toner Hopper
Home Position Sensor PC1 12. This ensures that the Toner Bottle is located so that
its opening is positioned on top whenever M8 is deenergized.

Toner Replenishing Motor M8

/

1151M019AA

/

Toner Hopper Home

Position Sensor PC1 12

M-23

Home Position Plate

1139SBM0905A

9-5. Toner Bottle Vibration

When the indentations at three places on the left-hand side (as viewed when the
Toner Bottle is in position) of the Toner Bottle move past the protrusion in the Toner

Bottle Holder, the Toner Bottle is vibrated to prevent some of the toner from
remaining unconsumed in the Bottle.

,

Toner Bottle

Toner

Bottle Holder

Protrusion

M-24

1151SSM0906A

9-6. Toner Replenishing Control

1.

The ATDC Sensor installed in the Imaging Unit reads the toner-to-carrier ratio

of the developer in the Developer Mixing Chamber for each copy cycle.

2. It samples the ratio 16 times and compares each with the preset level.

3.

If eight or more readings out of the total 16 are lower than the preset level, a Toner
Replenishing signal is output.

4. Toner Replenishing Motor M8 is turned one complete turn for each Toner
Replenishing signal (which is equivalent to a supply of 0.45 g toner).

*The readings taken while M8 is turning (it takes 5 seconds for M8 to turn one

complete turn) are ignored. This means that, in a multi-copy cycle, the ATDC
Sensor may take readings as the next copy cycle is started while M8 is turning; but,

those readings are ignored.

M8

PC112

UN3

Control Signal

PWB-A

PJ6A-5

Control Signal

PWB-A

PJ22A-10

Control Signal

PWB-A

PJI

A-3

Energized Deenergized

H

Blocked

L

Set T/C

4.0%

4.5%

5.0%

5.5% 2.404

6.0%

6.5%

7.0%

L

Unblocked WIRING DIAGRAM

H

Reference

Voltage

2.692

2.596

2.5

2.308

2.212

2.116

WIRING DIAGRAM

30-E

30-E

WIRING DIAGRAM

30-B

M-25

,

1151SSMlOOOA

DRUM CHARGING

The PC Drum Charge Corona has a Scorotron grid to deposit a negative DC charge
evenly across the surface of the PC Drum. The grid voltage (VG) applied to the grid
mesh is selected between
by the Constant-Voltage Circuit in High Voltage Unit HVl.

The Corona Unit has a Comb Electrode which minimizes the amount of ozone
produced. The conventional wire type corona unit produces a large amount of
ozone due to corona discharge in radial directions. The comb electrode type, on the
other hand, discharges only toward the Grid Mesh, meaning a reduced amount of
ozone is produced.

The Comb Electrode can be cleaned by the user who pulls out to the front the shaft
on which a Cleaning

-65OV

Rollar

is mounted.

in the normal mode and -52OV in the Photo mode

Paper loading Edge

PC Drum Charge Corona

PC Drum

Charge Corona

Grid Voltage

(VG)

Holder

Start Key

Detecting

Control Signal

PWB-A

PJ12A-5

Control Signal

PWB-A

PJ12A-6

Comb Electrode

I

1

I

Approx. 0.2

set

ON

Normal

Mode

S

I

I

Approx. 0.7

OFF WIRING DIAGRAM

L

L

H

Photo Mode WIRING DIAGRAM

H

set

115iT03MCA

II-E

11-E

M-26

1151SBM1100A

To prevent a black band from occurring across both the leading and trailing edges,
and along the front and rear edges, of the electrostatic latent image, 31

LEDs

of
Image Erase Lamp LA3 are turned ON before development takes place, thereby
reducing to a minimum the unnecessary potential on the surface of the PC Drum.
Because of the light path involved, this copier has this edge erasing cycle between

drum charging and exposure.

Image Erase Lamp LA3

Exposure

The position of LA3 can be adjusted using the adjusting

screw on the front of the

copier.

Copier
Frame

Compression
Coil Spring

LA3 Board

LA3 Holder

Screw

The 31
this page shows which

LEDs

of LA3 are grouped as shown below. The diagram on the bottom of

LEDs

turn ON and OFF for different paper sizes and different

zoom ratios.

*The smaller the number, the nearer the LED is to the front side of the copier.

LED ON/OFF Pattern

Zoom Ratio

From - To From - To

Less Than Less Than 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18

W)

50-53 to 152
53-57

574

61-64
64-67
67-70
70-74
74-78
78-82
82-86
86-90

90-93 259to270

93-96
96-99

99%

o:ON;

-:OFF

Paper Width

(mm)

152to163
163to173
173to183
183to192

192to201
201to212
212to223
223to235
235to247
247to259

27Oto281
28lto291

291 to

O__-

0 - - - - 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 e - - - -

0 - - - - - - 000000000000
0 - - - - - ­0 - - - - - - - - 0000000000
o---------000000000
0 - - - - - - - - - - 0 0 0 0 0 0 0 0
0 - - - - - - - - - - - 0 0 0 0 0 0 0
0 - - - - - - - - - - - - 0 0 0 0 0 0
0 - - - - - - - - - - - - - 0 0 0 0 0
0 - - - - - - - - - - - - - - 0 0 0 0

0 - _ _ _ _ _ _ _ _ _ _ _ _ _ _ 0 0 0

O_----_---__---___O(-J

O---_----_--_-_-__-_o

000000000000000

LED Group No.

0000000000000

-

0 0 0 0 0 0 0 0 0 0 0

*Max. width (291 mm or more) applies to manual bypass copying in which the copier

is unable to detect paper width.

M-28

PC Drive Motor Ml

SEND

ON

OFF

Image Leading Edge

:

c

image Erase ON

Lamp LA3 OFF-

LA3

PWB-A

--D+- MI-

4

All LEDS ON

Control Signal

PJI 7A-4 N

9

I

c*

Approx. 0.2

ON/OFF Control

ON

L

Approx. 0.2

set

OFF

H

set

i

-

W_

All LEDS ON

1151T04MCB

WIRING DIAGRAM

2-F

M-29

1151Sl3M1201A

12-l. Exposure Lamp LA1

An AC halogen lamp is used as Exposure Lamp

LA1

.

As the exposure level is adjusted on the control panel, the duty ratio of the pulse
of AVR Remote from PWB-A changes to increase or decrease the LA1 voltage,

thereby changing the image density.

In Photo mode, the voltages are varied on a level 5V lower than the manual
Exposure Lamp voltages.

Manual EXP Setting
Lamp Voltage

Difference (V)

Roller

(LAl)

Sensor PC51

PWB-A

Transport

AVR Remote
Signal

*If reduction copies are made

9 8 7 6

-8 -4 -2

SEND

Control Signal

PJ12A-11

using

5 4 3 2

+l

-1 Reference

I

;

Image Leading Edge

I

ON

L

OFF

H

+2 +4

I

I

2nd Copy

1151T05MCA

WIRING DIAGRAM

22-F, 22-H

large size paper, the trailing edge of the first

1

+8

Edge

copy moves past PC51 after the SCEND signal for the second copy has been
generated. If LA1 is turned ON for the second copy at the same timing as the first
one, therefore, the image for the second copy is produced on the trailing edge of
the first copy. To prevent this from occurring, LA1 is turned ON for the second and
subsequent copies when all of the following conditions are met:

l

Approx. 0.8 sec. or more have elapsed after the first copy deactivated

PC51.

*The PC51 output is HIGH.

l

The SCEND signal for the second copy is output.

1151SBM1202A

12-2.

AE Sensor

In the Auto Exposure Mode, the AE Sensor on AE Sensor Board PWB-H measures
the intensity of the light reflected off the original, which results in the black/white
ratio of a 210-mm-wide area from the reference position of the original being
measured. According to this measurement, the Exposure Lamp voltage is
automatically increased or decreased so that copies of consistent quality are
produced.

The output from the AE Sensor is applied to PWB-A which, in turn, varies the duty
ratio of the AVR Remote from it to vary accordingly the LA1 voltage.

OFF WIRING DIAGRAM

ON

L

L

H

H

21-L

22-F, 22-H

PWB-H

(AE

Sensor)

AVR

Remote

Signal (LA1

)

PWB-A

PWB-A

Control Signal

PJ2A-3

PJ12A-11

M-32

115133M1203A

12-3. Lamp Reflectors
The Main Reflector ensures that light from Exposure Lamp LA1 exposes all areas

of the original. The Auxiliary Reflector functions to reflect light onto the areas that
LA1 cannot illuminate when an original that does not lie flat on the Original Glass
(such as a book) is being used. This reduces shadows which would otherwise be

transferred to the copy.

The Main Reflector is of aluminum, while the Auxiliary Reflector is aluminum to

which film has been deposited. The same film as that used on the Auxiliary

Reflector is affixed to both ends of the frame to compensate for the reduced
intensity of light around both ends of the Exposure Lamp.

Auxiliary Reflector

lzzs::::::

1151M021AA

1151SBM1204A

12-4. Aperture Plates
Four Aperture Plates are moved to the front and rear to ensure even light

distribution.

~

, Aperture Plate

1151 MOPOAA

M-33

1151SBM1205A

12-5.

Scanner and

The Scanner and

fitted in the rear side of the copier. The Cable is driven by Scanner Motor

2nd13rd

2nd/3rd

Mirror Carriage Movement

Mirrors Carriage are moved by the Scanner Drive Cable

M5.

Both the Scanner and

2nd/3rd

Mirrors Carriage slide along the Scanner Shaft at the
rear side. While at the front side, there is a Slide Bushing attached to the underside
of each of the bodies and that Bushing slides over the Slide Rail. The speed of the
Scanner and

2nd/3rd

Mirrors Carriage varies with different zoom ratios.

Scanner Reference Position Sensor PC81 detects the home position of the
Scanner and

2nd/3rd

Mirrors Carriage. If they are not at the home position when

the copier is turned ON, M5 is energized to move them to the home position.

2nd/3rd

Mirrors

Carriage

Scanner

Drive Cable

1151M022YA

M-34

The Scanner starts the scan motion as a Scan Sel signal

(PJ16A-3)

is output from

PWB-A. At the start of a scan motion and other heavy load conditions, Scanner

Motor M5 requires a large amount of current. The Current

1

or 2 signal

(PJI 6A-10

or 11) from PWB-A is selected accordingly to vary the amount of current supplied
to M5.

*The Current signal selection timing is controlled by software.

Current 1
Current 2

Current

H
H H

Approx.

0.6A

When the scan At scan start and At return start and
speed reaches a
given level and speed reaches a zoom ratio
during return braking. given level.

when the return at scan

L L

Approx.

0.7A

L

Approx.

start

0.9A

for low

On receiving the Scan Sel signal, Motor Drive Board PWB-E applies motor drive
pulses, which are out-of-phase with each other, to M5. The motor speed is varied
by changing the width of the pulses applied to M5.

PWB-A

PJl BA-10

PWB-A

1

I

mPC81GPWB-A=2A-1

Control Signal ) Blocked 1 Unblocked 1 WIRING DIAGRAM

PJIGA-11

1 L 1

M-35

H

1

20-N

1

1151Sl3M1206A

12-6.4th Mirror Movement

The 4th Mirror is moved to vary the conjugate distance for a particular zoom ratio
by driving the rack-and-pinion gears at the front and rear ends of the mirror using

Mirror Motor M7 (stepping motor). The Levers of the Holder to which the Mirror is
mounted slides along a tilted rail to change the Mirror angle. This ensures that the
light strikes the surface of the PC Drum in the direction of the normal, thereby
preventing resolution from being degraded.

Mirror Reference Position Sensor PC81 is used to control the position of the 4th
Mirror. It ensures that the Mirror is located at the home position when the copier is

turned ON.

Drive Shaft

Mirror
Motor
M7

Y

Control Signal

i

M7 1 PWB-A

Control Signal

PWB-A

PC86

PJ20A-2

Tilt Adjusting Screw

1139M038AA

Energized Deenergized1 WIRING DIAGRAM

PJ16A-2 1

Blocked

L 1 H

L

Unblocked

H

1

WIRING DIAGRAM

20-M

M-36

1151SBM1207A

12-7. Lens Movement

The Lens is moved by the Lens Drive Cable which is driven by Lens Motor M6 (step­ping motor). The motor drive pulses

(PJ4E-1

to 4) sent from PWB-E drive M6 to
move the Lens a given distance, corresponding to the zoom ratio, from the refer­ence position determined by Lens Reference Position Sensor

PC90.

There is a fixed-type Lens Aperture Cover provided at the rear of the Lens (on the
4th Mirror end). It limits the amount of light striking the surface of the PC Drum.

Lens Reference Position Sensor PC90

/

Lens Base Bracket

Lens Aperture Cover

1

I

1

M6 1 PWB-A PJlGA-1 1 L

PC90

Control Signal

Control Signal

PWB-A PJ20A-5

Energized Deenergized( WIRING DIAGRAM

Blocked

L

Unblocked

M-37

1

H

H

1151

M023AA

1

WIRING DIAGRAM

20-M

I

1158SBM1300A

MAIN ERASE LAMP

Main Erase Lamp LA2 is turned ON to neutralize any surface potential remaining

on the surface of the PC Drum after cleaning.

w

LA2 consists of ten tungsten-filament lamps mounted on a Board.

Mouhting

u

Start Key

PC Drive Motor Ml

Main Erase Lamp LA2

LA2

PWB-A

Bracket

Control Signal

PJI

A-7

ON

M-38

H

1139M045AA

OFF

L

Copier
Front Frame

u

1151TO6MCA

WIRING DIAGRAM

31-c

1158SBM1400A

IMAGE TRANSFER AND PAPER SEPARATION

1

Image Transfer

The Image Transfer Corona applies a DC negative corona emission to the
underside of the paper thereby attracting the positively charged toner onto the
surface of the paper to form a visible, developed image of the original. The Corona
Unit is provided with a Corona Wire cleaning mechanism: the operator has only to
pull out the Lever on which the Cleaner is mounted from the front of the copier, which
cleans the Wire.

Paper Separation

The Paper Separator Corona showers the underside of the paper with both positive
and negative charges so that the paper can be easily separated from the PC Drum.
In addition, two Paper Separator Fingers physically peel the paper off the surface
of the PC Drum. (For details, see PAPER SEPARATOR FINGERS.)

The Image Transfer/Paper Separator Coronas Unit is provided with a Pre-Image
Transfer Guide Plate that determines the angle at which the paper comes into
contact with the PC Drum and keeps an optimum distance between the paper and
the PC Drum so that the image may be properly transferred onto the paper.

-

PC Drum

Housing

Paper Separator
Corona Wire

Cleaner Lever

Pre-Image Transfer
Guide Plate

Image Transfer
Corona Wire

Cleaner

M-39

Start Key

Paper Separator Corona

:zF.

,

Approx. 0.5

WC

Image Transfer Corona

image Transfer

Corona

Paper Separator

Corona

PWB-A

PWB-A

CFF

Approx. 0.1

Control Signal

PJ12A-5

PJ12A-4

set

ON

L

L

OFF

H

H

1151 T07MCA

WIRING DIAGRAM

11-E

11-E

M-40

1158SBM1500A

PAPER SEPARATOR FINGERS

After image transfer, an AC corona emission is applied to the underside of the paper
by the Paper Separator Corona to neutralize the paper so that it can be easily
separated from the PC Drum. To further ensure that the paper is positively
separated from the PC Drum, there are two Paper Separator Fingers attached to
the Imaging Unit. They physically peel the paper off the surface of the PC Drum.

To prevent the Paper Separator Fingers from damaging the surface of the PC Drum,
they are kept in the retracted position whenever they are not at work. As illustrated
below, the Fingers are brought into contact with, and retracted from, the surface of

the PC Drum by the Lever which is operated by Separator Solenoid

Where Fingers are in Where Fingers are
Contact with PC Drum Retracted from PC Drum

)

SLl

.

Separator Finger

The Paper Separator Fingers are also moved over a given distance to the front and

rear so that they will contact wider areas of the surface of the PC Drum, thus
preventing localized damage to the PC Drum surface. This lateral movement is
done by the Lever connected to the Cleaning Blade and, when the Cleaning Blade

is moved, the Separator Fingers are also moved back and
*Lateral Movement: 3.7 mm

,

TveT

Finger Positions

Cleay

ng Blade

forth.

Paper Path
Reference Position

1139M049AA

Holder

M-41

Synchronizing Roller Clutch CL1

Separator Solenoid SLl

i

Approx. 0.4

Approx.

0.4

set

1151T13MCB

SLl

Control Signal Energized Deenergized

PWB-A

PJ14A-2

L

WIRING DIAGRAM

H

14-A

M-42

1156SBM1600A

PAPER TAKE-UP/FEED SECTION

(

The copier is equipped with one universal paper size Drawer that can hold up to 250
sheets of paper.

Paper Take-up
Solenoid

Paper Take-Up Sensor

Paper Sizes That Can be Loaded

Marketing Area

Switch S66

Inch

Inch Areas

Metric

Metric
Areas

Metric

Inch

*

Except Taiwan

\

Paper Drawer

5.5 x

8.5,

8.5 x

ill,

8.5 x

llx17

A5L, A4L, A4C, A3L, 8x13,

8-1/4x13

A3L, B4L, A4L, A4C, A5L, B5C, B5L

8~ 13*,

XYx8.5

8.5~

8.5~

13,

8-1/4x 13

[INVOICE], 8.5~ 11 [LETTER]*,

14 [LEGAL]*, 11~ 17*

14,

8.5x13[G.LEGAL],

1156M003YA

11 x

8.~7, 11 x 14,

(Taiwan Only),

Size)

M-43

1158SBM1601A

16-l. Edge Guide and Trailing Edge Stop
Paper Drawer

The Paper Drawer is a universal type allowing the user to slide freely the Edge
Guide and Trailing Edge Stop to accommodate paper of different sizes.

The Edge Guide and Trailing Edge Stop can be locked into position by meshing the

notches in the Lock Lever with those in the Drawer.

Drawer Side

Lock Lever

1139M052AA

Trailing Edge Stop

M-44

1139M064AA

1158SBM1604A

16-4.

Drawer-in-Position Detection

The copier detects that the Drawer is slid into position as follows.
When the Drawer is slid into the copier, the Drawer Frame presses Drawer Set De-

tecting Switch S65 installed on the back panel of the copier.

Paper Size
Detecting Switches

cting

Switches S65

Draher

Frame

cControl>

1

L

OFF

1

WIRING DIAGRAM

( l-l (

25-G

1

I

I

I

1

S65 1 PWB-A

Control Signal

1 ON 1

PJ9A-13

M-46

1158SBM1605A

16-6.

Universal Tray Paper Size Detection

The length (feeding direction) and width (crosswise direction) of the paper are

independently detected and the copier determines the paper size by combining the

two separate detections made.
On the bottom of the tray are a lever fitted to the Trailing Edge Stop and another

lever fitted to the Edge Guide. These levers actuate and

deactuate

Paper Size

Detecting Switches S61, S62, S63, and S64 to allow the copier to determine a

particular paper size.
Marketing Area Switch S66 is used to set the type

S66

S62

-

Drawer Set Detecting

of

paper to

Switch S65

NOTE

The number and the installed position of the

Paper Take-Up Rolls vary depending on the

marketing

areas: inch ormetric. Seepp. M-43
for the sizes of the paper that can be taken up
and fed out of the drawer.

1151M003AA

Paper Size Detecting Switches

Length (FD)

S61 1 S62 1 S63

,

ON

ON ON

ON

I

I

1

ON

OFF OFF

I

OFF ( OFF 1 OFF

-Fl/++

;95.0-

1

OFF

ON

I

1

I

1

Width (CD) Paper Length

S64

OFF

OFF

AEF

1

I

-

ON 11 x 14

ON

-

-402.0

402.0-349.2

349.4-317.2

I

1

317.2-272.0

272.0-222.0

I

22.0-l 95.0

1

Inch/Metric Setting Switch S66

I

1

I

1

1

be used (inch or metric).

Metric Inch

A3

84

FLS

A4L

1

B5L m

I

I

llX17

8~1/2

x 14

8-l/2

x 14”

11” x 14

I

I

Letter L

A5L invoice L
A4L Letter C

I

B5C

ottcv

I-

1

C

<Control>

1156SBM1606A

Control Signal

PWB-A

PJSA-1 L H

PWB-A

PJ9A-4

PWB-A

PJ9A-7

PWB-A

PJSA-10

PWB-A

PJl

OA-4

ON OFF

L H
L
L H
L H

H

WIRING DIAGRAM

25-D
25-E
25-E
25-F

25-G

16-6. Paper Empty Detection

When the Drawer runs out of paper, the Actuator for the Paper Empty Sensor drops
into the cutout in the Paper Lifting Plate. This activates the Paper Empty Sensor and

the copier will know that the Drawer has run out of paper.
As we noted earlier, the Paper Lifting Plate is raised at all times by the Paper Lifting

Springs. To prevent the Actuator for the Paper Empty Sensor (PC1 01) from being
caught by the paper stack when the Drawer is slid out of the copier, therefore, it is
tilted slightly. This, however, results in the operating stroke of the Actuator

becoming small, which increases the possibility of the Actuator activating the
Sensor by flexing of a sheet of paper as it is taken up and fed in. To prevent this false
detection a paper-empty condition, the paper empty detection is enabled only when
the Paper Take-Up Roll is in the retracted position. (See 16-8. Paper Take-Up Roll
for the retracted position of the Paper Take-Up Roll.)

Paper Empty Sensor

<Control>

1

Control Signal1 Blocked 1 Unblocked

PC101 ( PWB-A

PJ7A-6

Actuator

L

M-48

)

WIRING DIAGRAM

H

25-B

1

1158SSM1607A

16-7. Paper Separating Mechanism

The Drawer has Fingers that function to separate the top sheet of paper from the

rest of the paper stack at paper take-up. The Fingers are fitted to the right front and
rear corners of the Drawer. When the Paper Take-Up Roll starts turning to take up

the top sheet of paper, its turning force is directly transmitted to the top sheet of pa-

per as it is in direct contact with the Paper Take-Up Roll. That force overcomes the
block of the Fingers, causing the top sheet of paper to ride over the Fingers and be

fed out of the Drawer into the copier.

As to the second sheet of paper, the paper transport force obtained through friction
with the top sheet of paper is weak and does not allow the second sheet of paper
to ride over the block of the Fingers. Hence, the second sheet of paper remains

stationary with the rest of the paper stack in the Drawer.

When there are only two sheets of paper left in the Drawer, the bottom sheet can

be fed with the top one if the friction of the Paper Lifting Plate is weak. The Friction

Plate affixed to the Paper Lifting Plate prevents this from happening.

Paper Take-Up Roll

Friction Plate Paper Lifting Plate

1156SBM1606A

16-8. Paper Take-Up Roll

Since the Paper Lifting Plate is raised at all times by the Paper Lifting Springs, paper
is wedged in the mechanism when the Drawer is slid out of the copier if the Paper

Take-Up

Roll is round

in shape. So the Take-Up Roll is semicircular and the circular

part of the Roll is positioned on top at times other than take-up. For convenience,

we call this position of the Paper Take-Up Roll the retracted position.
The Paper Take-Up Roll is grooved to keep good friction even under heavy loading.

The Paper Drawer, which is a universal type to accommodate paper of different
sizes, is provided with five (four in areas using only inch paper) Paper Take-Up

,

Rolls.

The Paper Take-Up Roll is driven when the Paper Take-Up Solenoid (SL2) is

energized. The Roll is turned one complete turn for each single sheet of paper.
The Paper Take-Up Sensor

(PC%)

been properly taken up or not.

Paper Take-Up Roll

is used to detect whether a sheet of paper has

Paper Take-Up

Solenoid

Ratchet

Ratchet

Vertical Transport Roller

1139M066AA

1151M025AA

M-50

Start

Key

Sensor PC55 q

I

:

1st copy

:

2nd Copy

1158TO1

MCA

Energized Deenergized

L

Blocked

H

H

Unblocked WIRING DIAGRAM

L

WIRING DIAGRAM

25-c

25-B

SL2

PC55

1158SBM1609A

Control Signal

PWB-A

PJ7A-9

Control Signal

PWB-A

PJ7A-2

16-9. Paper Take-Up Retry Control

To minimize the occurrence of paper misfeed due to a slippery Paper Take-Up Roll,
the Paper Take-Up Solenoid is energized a second time if a sheet of paper fails to

reach the Paper Take-Up Detecting Sensor within

1.3

sec. after the solenoid has
been deenergized. The solenoid is energized a second time 0.5 sec. after the
above-mentioned period of

1.3

sec. has elapsed. (This is referred to as the paper

take-up retry function.)
A misfeed results if the sheet of paper does not reach the Paper Take-Up Detecting

Sensor even after the three paper take-up sequences.

Here is the control timing chart.

0.1

set

1.3

SL2

ON -

OFF

-

4-b<

set

0.5 5ec 0.1

I

w-

I

I

I

I

I
I

set

-

I

PC55

E

1

IiSBTMMCB

1158SBM1700A

VERTICAL PAPER TRANSPORT

1

The sheet of paper taken up by the Paper Take-Up Roll from the Drawer is fed along
the Paper Guide to the Vertical Transport Rollers. The paper fed by the Vertical
Transport Rollers reaches the Transport Rollers and is then fed up to the
Synchronizing Rollers. The Transport Rollers are turned and stopped by Paper
Transport Clutch CL2. Transport Roller Sensor PC51 immediately before the
Transport Rollers detects a sheet of paper fed from the Vertical Transport Section
or Manual Bypass Table.

The Cover for the Vertical Transport Section (i.e., the Side Door) can be opened and
closed for clearing misfeeds. Side Door Detecting Sensor PC57 detects whether
or not this Cover is open.

Side Door

Detecting

Sensor PC57

Vertical
Transport
Rollers/Rolls.

1142M006AA

<Control>

Paper Leading Edge

Detecting Sensor PC54

i/

1

M2

CL2

I

I

PC54 I PWB-A

I Control SignalI Blocked I Unblocked

@I
szl

Control Signal

1

PWB-APJ12A-10 1

PWB-A

PJ6A-2

Energized Deenergired 1 WIRING DIAGRAM

L 1 H

L

PJ18A-2 I

I

L I H

TRON

1 St copy

H

2nd Copy

1

2-M

WIRING DIAGRAM

I

1

14-D

ll5lTlOMCA

I

1

I

M-52

1156SBM1600A

SYNCHRONIZING ROLLERS

1

The Synchronizing Rollers, operating in phase with the Scannersscan motion and

paper feeding, synchronize the leading edge of the copy paper accurately with the
leading edge of the toner image on the PC Drum.

The Upper Synchronizing Roller is a metal roller covered with a polyvinyl chloride
tubing, while the Lower one is a rubber roller.

Svnchmnikm

~,...e...~...-.J

Upper Synchronizing Roller

Paper Leading Edge Detecting

v

To

facilitate clearing of misfeeds, the Upper Synchronizing Roller is installed in the

Roller Clutch CL1

1151

M026AA

Imaging Unit, It is fitted to the Guide Frame of the Imaging Unit and the
Compression Springs at the front and rear ends press the Roller downward so that
it makes contact with the Lower Synchronizing Roller, The Lower Roller is driven
by the drive source, while there is

agear

train that transmits the rotation of the Lower

Roller to the Upper Roller, thus ensuring good paper transport performance.
To ensure good image transfer during conditions of high humidity, an

82-megohm

resistor is connected to the Pre-Synch Guide Plate and the Guide Plate is
electrically insulated by a plastic spacer installed between the frame and Guide
Plate.

Jpper Synchronizing Roller

Guide Plate

/

Lower Synchronizing Roller

~

/

Actuator

M-53 

Frame

Pre-Synch Guide Plate

Paper Leading Edge
Detecting Sensor PC54

1139M069AA

1158SBM1801A

18-1. Upper Synchronizing Roller Positioning

Since the Upper Synchronizing Roller is fitted to the Imaging Unit, it must be

correctly positioned with reference to the Lower Synchronizing Roller when the

Upper Half of the copier is swung down into the locked position. For this purpose,

slits are cut in the lower copier frame and the Bushings of the Upper Synchronizing

Roller fit into these slits.

The Upper Synchronizing Roller is grounded through the Bushings which are in

contact with the frame. To positively ground the Roller, the Ground Plate fitted to the
lower frame makes contact with the Shaft of the Upper Synchronizing Roller.

Copier

Frame

1151

M027YA

1158SBM1802A

18-2. Paper Dust Remover

The Paper Dust Remover is installed so that it makes contact with the Upper
Synchronizing Roller. Since the Upper Synchronizing Roller is covered with a vinyl
tubing, triboelectric charging occurs as the Roller turns in contact with the Paper
Dust Remover. As paper is then fed between the Synchronizing Rollers, the
charges on the tubing attract paper dust from the paper. The dust is then transferred
onto the Paper Dust Remover.

Upper

Lower Synchronizing Roller

M-54

1158SBM1803A

18-3. Synchronizing Roller Control

The Synchronizing Rollers are started as Synchronizing Roller Clutch CL1 is
energized upon reception of a signal from PWB-A.

Paper Leading Edge Detecting q

PC54

CL1

Sensor PC54 q

CL1

Control Signal

PWB-A

PJ6A-4

Control Signal

PWB-A

PJ18A-2

ON

OFF

I

I

7:

Approx. 0.4

I

I

I

Energized Deenergized

L

Blocked

L

I

set

H

Unblocked

H

I

I

w

Approx. 0.4

I

WIRING DIAGRAM

WIRING DIAGRAM

tk-4

set

2-N

14-D

I

e

Approx.

I

1151TllMCA

M-55

1158SBM1900A

PAPER TRANSPORT

1

After having gone through the image transfer and paper separation processes, the

paper is then transported to the Fusing Unit by the Suction Belts of the Suction Deck

driven directly by Main Drive Motor M2.

Suction Fan Motor M4 draws the paper onto the turning Suction Belts for positive

transport of the paper.

Suction Fan Motor M4

1151M005AA

M2
M4

Control Signal

PWB-A

PJ12A-10

PWB-A

PJ6A-8

Energized Deenergized

1

L
L

H
H

M-56

1 WIRING

DIAGRAM

5-F

2-o

1158SBMZOOOA

FUSING UNIT

The Upper Fusing Roller and Lower Fusing Roller together apply heat and pressure
to the toner and paper to permanently fix the developed image to the paper.

Drive for the Upper Fusing Roller is transmitted from the Main Drive Motor to the
Upper Fusing Roller Drive Gear. The Lower Fusing Roller, Cleaning Roller and Oil
Roller are driven by the respective Rollers in contact with them.

Fusing Thermistor THl

Fusing Thermoswitch

Fusing Heater Lamp Hl



Upper Fusing Roller

Lower Fusing Roller

Oil

Roller

/

Pressuri Spri

Cleaning Roller

1151MOIIAA

Paper Exit Roller Drive Gear



Upper Fusing Roller Drive Gear

,,5,M007AA

1158SBM2001A

20-l. Fusing Temperature Control

The Upper Fusing Roller is heated by Fusing Heater Lamp HI which is an AC
halogen lamp. Fusing Thermistor

THI

installed on the Upper Fusing Roller helps

keep the optimum fusing temperature.
The fusing temperature is normally controlled at

195C.

To ensure good fusing
performance, however, even when the Lower Fusing Roller remains cool
immediately after warm-up in the early morning, the temperature is controlled as
follows when the copier is turned ON:
If the initial fusing temperature is less than 90C:

Temperature is controlled at 205C for IO min. after the copier has completed
warming up, which is followed by a temperature control at 195C.

*If the initial fusing temperature is less than 150C:

Temperature is controlled at 205C for 1 min. after the copier has completed
warming up, which is followed by a temperature control at 195C.

*If the initial fusing temperature is more than 150C:

Temperature is controlled at 195C after the copier has completed warming up.

THI

is positioned at a point 84 mm from the paper path reference position, thereby

preventing offset

causedsby

low temperature and degraded fusing performance for

small-size paper.
The control temperature in the Energy Saving Mode is 100C.
Fusing Thermoswitch TSI, installed above the Upper Fusing Roller, cuts off the

power to the Fusing Unit if the temperature of the Upper Fusing Roller becomes
excessively high. It eliminates the possibility of a fire that could occur when Hi
remains ON due to a faulty temperature control circuit.

Warm-up time = Within 1 minute

205

Warm-up Completed Energy Saving Mode ON

M-58

1151M017CA

1158SBM2002A

20-2. Fusing Rollers Pressure Mechanism

Pressure Springs are installed at both ends of the Lower Fusing Roller. These
springs contact the bearings mounted on both ends of the Lower Fusing Roller and
exert pressure through the Lower Fusing Roller to the Upper Fusing Roller which
is installed in the Fusing Unit.

The Fusing Unit is divided into an upper and a lower half, and the upper half can
be swung open. The Upper Half of the copier, when locked in position, presses the
upper half of the Fusing Unit down onto its lower half.

Upper Copier Frame

Upper Fusing Roller

Pressure

Lower Fusing Roller

1139M07bAA

Ii 58SBM2003A

20-3.

Oil Roller/Cleaning Roller

,

A felt-type silicone Oil Roller is pressed up against the Lower Fusing Roller by the
Torsion Springs fitted on the bushings on both ends of the Oil Roller. The Oil Roller
applies a coat of silicone oil to the surface of the Lower Fusing Roller. From there,
it is transferred to the surface of the Upper Fusing Roller to help prevent toner from
being melted onto the surface of the Upper Fusing Roller.

The Cleaning Roller is pressed against the surface of the Lower Fusing Roller, thus
assisting cleaning of the fusing rollers.

r-),



Oil Roller

Upper Fusing Roller

Lowef

Fusing Roller

Cleaning Roller

1151 MOOBAA

M-59

1158SBM2102A

21-2. Paper Exit Sensor
Paper Exit Sensor PC53 installed in the paper exit section of the lower half of the

copier detects the sheet of paper being fed out of the Fusing Unit onto the Copy
Tray.

1139M080AA

Paper Exit Sensor PC53

Control Signal Blocked

PC53

I

PWB-A PJ21 A-2

L

M-61

Unblocked

H

WIRING DIAGRAM

14-F

1158SBM2200A

m

DEHUMIDIFYING SWITCH (OPTION)

(

To prevent image transfer efficiency from being reduced due to damp paper in

highly humid weather, Paper Dehumidifying Heater H3 is installed on the base

frame of the copier under the Drawer.
While, Drum Dehumidifying Heater H2 is located under the Lower Synchronizing

Roller to prevent the PC Drum from forming condensation.

Drum
Dehumidifying

Lower Synchronizing
Roller

Serviceman

Switch S3

/

Paper Dehumidifying Heater H3

Paper Take-Up Rolls

Base frame

Heater H2

l

H2, H3 ON/OFF Conditions

I

Power cord Plugged in

H2

1

H3

1

ON
ON

Serviceman Switch ON

1

Power

SwCtch

ON1 *During a

I

I

OFF

ON

copy

cycle

I

I

OFF
OFF

*During a copy cycle: Refers to the period of time between when the Start Key is pressed

and when Main Drive Motor M2 is deenergized.

M62

1158SBM2300A

MULTI BYPASS TABLE MB-4 (Option)

The optional Multi Bypass Table permits the user to make multiple copies (up to 50)
on paper that cannot be fed

automatically

Lever

via any built-in paper drawer of the copier.

Clutch

(MB-4)

Paper Take-Up Roll

1139MO87AA

M-63

1158SBM2301A

23-1. Paper Take-Up Mechanism

The Paper Take-Up Rolls are normally in their raised (retracted) position so that
they will not hamper proper loading of paper. When the Start Key is pressed, Paper
Take-Up Solenoid (MB-4)

SL51

is deenergized causing the Paper Take-Up Rolls

to press the paper stack downward and take up a sheet of paper.
There are Paper Stoppers provided that block the leading edge of the paper stack

as it is loaded on the Table, preventing any portion of the leading edge of the paper
from getting inside. These Stoppers are unlocked at paper take-up, allowing paper
into the copier.

Paper Take-Up Clutch (MB-4) CL51 controls the turning and stop of the Paper

Take-

Up Rolls.

In Standby

At Take-Up

Lock Levers

Paper Stoppers

,

Lever

Paper Take-Up
Solenoid (MB-4) SL51

113OM088AA

M-64

Paper Take-up Solenoid ON

Paper Take-up Clutch ON

(MB-+

CL51

Transport Roller Sensor PC51

OFF

;

0.3

I

of Paper

set

I

1151T12MCA

;

0.3

ml

El

set8,

I

1 st Sheet 2nd Sheet

of Paper

CL51

SL51

Down

SL51

UP

Control Signal

PWB-A

PJilA-4

PWB-A

PJll

PWB-A

PJllA-3

A-2

Energized Deenergized

L
L

L

H
H

H

WIRING DIAGRAM

30-G

30-G

M-65

115BS13M2302A

23-2. Paper Separating Mechanism

The paper separating mechanism ensures that only the top sheet of paper is fed
in by separating the second sheet of paper from the top one. This is accomplished
by the Torque Limiter fitted to the Separator Roll shaft which stops the Separator
Roll when there is a change in friction between the Feed and Separator Rolls.

At the Time of Double Feed:
The top sheet of paper is fed into the copier by the Feed Roll. Since the

coefficient of friction between the top and

second sheet of paper is smaller than
that between the second sheet of paper and the Separator Roll, the two sheets
of paper slip and the second sheet of paper is not fed into the copier. The driving
force of the Feed Roll is at this time consumed by the two slipping sheets of paper
and not transmitted to the Separator Roll which is stopped by its Torque Limiter.
In other words, the force of the Torque Limiter is greater than the driving force
of the Feed Roll as it is transmitted through the two sheets of paper.

Feed Roll

(

Separator Roll
*Stationary in this condition.

1139MOWAA

Normal Feeding:

The friction coefficient on the top side of the paper is equivalent to that on the

underside. Hence, the driving force of the Feed Roll is directly transmitted to the
Separator Roll through the paper, causing the Separator Roll to be turned by the
Feed Roll. In other words, the force of the Torque Limiter is smaller than the driv­ing force of the Feed Roll as it is transmitted through the paper.

1139M091 AA

1158SSM2303A

23-3. Paper Empty Detection

The Multi Bypass Table is equipped with Paper Empty Sensor

(MB-4) PC31

detects a sheet of paper at the manual bypass port.

Take-Up Roll

Actuator

which

PC31

Control Signal

PWB-A PJll A-6

Blocked

L

Unblocked

H

WIRING DIAGRAM

30-H

1158SBM2400A

m

COOLING FAN

1

Ozone produced by the PC Drum Charge Corona and Image Transfer/Paper
Separator Coronas is drawn out of the copier by Cooling Fan Motor M9 and
absorbed by the Ozone Filter.

M9

is turned either at high or low speed. It turns at high speed for 3 seconds during

a copy cycle and after the Power Switch is turned ON.

Cooling Fan

PC Drum Charge Corona

Image Transfer/Paper
Separator Coronas

1151 MOOSAA

M9

Control Signal

PWB-A

PJ6A-9

Energized Deenergized

H

M-68

L

L

WIRING DIAGRAM

2-o

1158SBM2500A

m

OPTICAL SECTION COOLING FAN

1

Optical
it against the Original Glass which is heated by lit Exposure Lamp

Section

Cooling Fan Motor M3 draws outside air into the copier and blows

LA-I.

The Filter at the intake port of the Fan prevents dust and dirt from entering the
Optical Section of the copier.

M3 turns only during a copy cycle.

Front

of Copier

\

Original

Glass

1139M095AA

Cooling

1

WIRING DIAGRAM

20-O

1

I

Outside Air

I

M31 PWB-A

Fan Motor M3

1

Control Signal1 Energized 1 Deenergired

PJ32A-2

L H

1156SBM2600A

m

MEMORY BACKUP

1

ICI (RAM) of RAM Board PWB-R connected to Main Control Board PWB-A stores

the setting/adjustment values set in the Tech. Rep. Modes as well as the counter

counts. Backup Battery BAT1 is mounted on PWB-R to prevent the contents of

memory

from being lost when the power cord is unplugged or PWB-R removed from

the copier. BAT1 requires a voltage of

2V

or more to retain the contents of memory.

Important
As we noted above, the RAM stores critical data. If PWB-R has been replaced with
a new one, memory must first be cleared and then all settings be made again. It
should also be noted that PWB-R should not be replaced at the same time when
PWB-A is replaced.

M-70

,e-

MEMO

MINOLLA

Copyright

1996

MINOLTA

Printed in Japan

CO.,

LTR

MINOLTA CO,,

LTD,