Minolta D1502 Mechanical Electrical

EP1054/EP1085/EP2030

MECHANICAL/

ELECTRICAL

I

MINOLTA

COTNENTS

I. CROSS-SECTIONAL VIEW

l-l. Cross-Sectional View of 23 cpm
I-2. Cross-Sectional View of I8 cpm Copier
l-3. Cross-Sectional View of 15 cpm

2. COPY PROCESS

3. DRIVE SYSTEM

4. SEQUENTIAL EXPLANATION

5. IMAGING UNIT
5-l. Imaging Unit Drive
5-2.

Imaging Unit Toner

5-3. Imaging Unit Fuse

6. PC DRUM

7. DRUM CHARGING

8. IMAGE ERASE LAMP

9. OPTICAL SECTION
9-I. Exposure Lamp
9-2. AE Sensor
9-3. Lamp Reflectors
9-4. Aperture Plates
9-5.

Scanner and 2nd/3rd Mirror Carriage Movement

9-6. 4th Mirror Movement

9-7. Lens

IO. ORIGINAL SIZE DETECTING SENSORS (23 cpm COPIER ONLY) . . . . . . . . . . . . . . M-28

1 O-I. Original Size Detecting Sensors
1 O-2. Original Size Detecting Operation

I O-3. Sensor Locations
1 O-4. Size Detection
1 O-5. Original Size Detection Timing
I O-6. Original Cover Angle Detection (23 cpm Copier Only)

11. DEVELOPMENT

11-l.

ATDC Sensor
I I-2. Magnet Roller
I l-3. Developing Bias
I I-4. Doctor Blade
1 I-5. Sleeve/Magnet Roller Lower Filter

12. TONER HOPPER
12-l. Toner Hopper Locking/Unlocking
12-2. Toner Replenishing

12-3. Shutter
12-4. Toner Hopper Home Position Detection
12-5.

Toner Bottle Vibration

12-6. Toner Replenishing Control

13. PAPER TAKE-UP/FEED SECTION (2ND DRAWER: 23 cpm
COPIER ONLY)

13-I

.Edge

13-2.Drawer Positioning

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

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*...............................................................................................

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Movement

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Guide and Trailing Edge Stop

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Copier

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

Copier

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Recycling

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. . . . . . . . . . . . . . . . . . . . . . . . . . . M-32

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M-l

M-2

M-4
M-6
M-7
M-12

M-13

. . . . . . . . . M-14

M-15

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M-17

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M-22
M-23

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M-26

M-28
M-28
M-29
M-30
M-31

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M-34

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M-37

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.._...................

M-38

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M-39
M-39
M-40

M-40

M-42

M-43
M-44
M-45

13-3.Paper Lifting Plate
13-4.Drawer-in-Position Detection
13-5.Universal Tray (1 st Drawer) Paper Size Detection
13-6.Paper Empty Detection
13-7.Paper Separating Mechanism
13-8.Paper Take-Up Roll
13-9.Paper Take-Up Retry Control
13-lO.VERTICAL

14.

MULTI BYPASS TABLE
14-1 .Paper Take-Up

14-2.Paper Take-Up Retry Control
14-3.Paper Separating Mechanism

14-4.Paper

15.

SYNCHRONIZING

15-l .Upper Synchronizing Roller Positioning

15-2.Paper Dust Remover
15-3.Synchronizing

16. IMAGE TRANSFER AND PAPER SEPARATION

17. MAIN ERASE LAMP

18. PAPER SEPARATOR FINGERS

19.

CLEANING

19-l .Cleaning Bias

20. PAPER TRANSPORT

21. FUSING UNIT

21-1. Fusing Temperature Control

21-2.Fusing
21-3.Cleaning

22. EXIT UNIT

22-l .Upper/Lower Separator

22-2.Paper Exit Sensor

23. EXIT/DUPLEX SWITCHING UNIT (OPTION)

24. DEHUMIDIFYING SWITCH

25. COOLING

26. OPTICAL SECTION COOLING FAN

27. MEMORY BACKUP

Empty

UNIT

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Rollers Pressure

Roller

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FAN

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PAPER TRANSPORT

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Mechanism .....................................................................

Detection

ROLLERS

Roller Control

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Mechanism

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Fingers

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(OPTION)

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M-45
M-46
M-47
M-40
M-49
M-50
M-51
M-52
M-53
M-54
M-55
M-56
M-56

M-57
M-58
M-58
M-59
M-60
M-62
M-63
M-64
M-65
M-66
M-67
M-68

M-69
M-69
M-70
M-70
M-71
M-72
M-73
M-74
M-75
M-76

ii

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

1174SBM0100A

1 CROSS-SECTIONAL VIEW

1174SBM0101A

1-1. Cross-Sectional View of 23 cpm Copier

2345 6 7 8 9 10

1

22
21
20

23

19

18
24

1. 3rd Mirror

2nd Mirror

2.

3. 1st Mirror

4. Exposure Lamp

5. Lamp Reflector

6. Lens

7. Cleaning Blade

8. PC Drum Charge Corona

9. Image Erase Lamp

10. 4th Mirror

11. PC Drum

12. Sleeve/Magnet Roller

13. Synchronizing Roller

14. Trans port Roller

15. 1st/2nd Drawer Paper Take-Up Roll

16. 1st/2nd Drawer

1617

17. Image Transfer/Paper Separator
Coronas

18. Suction Unit

19. Cleaning Roller

20. Upper/Lower Fusing Roller

21. Paper Exit Rol ler

22. Exit/Duplex Switching Guide
(for optional Duplex Uni t and Sorter)

23. Duplex Unit Vertical Tr ansport Roller 1
(for optional Duplex Unit )

24. Duplex Unit Vertical T ransport Roller 2
(for optional Duplex Unit )

1174M005AB

11
12

13

14

15

M-1

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

1174SBM0102A

1-2. Cross-Sectional View of 18 cpm Copier

2345 6 7 8 9 10

1

23
22
21
20

19 18 17 16

1. 3rd Mirror

2. 2nd Mirror

3. 1st Mirror

4. Exposure Lamp

5. Lamp Reflector

6. Lens

7. Cleaning Blade

8. PC Drum Charge Corona

9. Image Erase Lamp

10. 4th Mirror

11. PC Drum

12. Sleeve/Magnet Roller

13. Synchronizing Roller

14. Trans port Roller

15. Paper Take-Up Roll

16. Drawe

17. Image Transfer/Paper Separator

18. Suction Unit

19. Cleaning Roller

20. Upper/Lower Fusing Roller

21. Paper Exit Rol ler

22. Exit/Duplex Switching Guide

23. Paper Exit Roller in Exit/Duplex

11
12

13

14

15

1174M004AB

Coronas

(for optional Sorter)

Switching Guide Unit
(for optional Sorter)

M-2

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

1174SBM0103A

1-3. Cross-Sectional View of 15 cpm Copier

Except U.S.A., Canada

✽

2345 6 7 8 9 10

1

21
20

19 18 17 16

1. 3rd Mirror

2. 2nd Mirror

3. 1st Mirror

4. Exposure Lamp

5. Lamp Reflector

6. Lens

7. Cleaning Blade

8. PC Drum Charge Corona

9. Image Erase Lamp

10. 4th Mirror

11. PC Drum

12. Sleeve/Magnet Roller

13. Synchronizing R ol ler

14. Transport Roller

15. Paper Take-Up Roll

16. Drawer

17. Image Transfer/Paper Separator

18. Suction Unit

19. Cleaning Roller

20. Upper/Lower Fusing Roller

21. Paper Exit Rol ler

11
12

13

14

15

1174M011AA

Coronas

M-3

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

1174SBM0200A

2 COPY PROCESS

2 3

6

4

5

5

MULTI BYPASS
T ABLE

1139M002AA

13

1. PC DRUM

2. DRUM CHARGING

3. IMAGE ERASE

4. EXPOSURE

5. DE VELOPING

6. PAPER FEEDING

10

9

12

11

1

8

8

7

7

8. PAPER SEPARAT ION

9. CLEANING

10.MAIN ERASE

11. TRANSPORT

12. FUSING

13.PAPER EXIT

7. IMAGE TRANSFER

1. PC Drum
The PC Drum is an aluminum cylinder coated with a photosensitive semiconductor.
It is used as the medium on which a visib l e developed image of the original is formed.
(For more details, see “6. PC DRUM”.)

2. Drum Charging
The PC Drum Charge Coron a U nit is equipped wit h a Co mb Electrode and a Scorotron
Grid to deposit a uniform negative charge across th e entire surf ace of the PC Drum.
(For more details, see “7. DRUM CHARGING”.)

3. Image Erase
Any areas of charge which are not to be developed are neutralized by lighting up LED s.
(For mor e details, see “8. IMAGE ERASE LAMP”. )

4. Exposure
Light from the Exposure Lamp reflect ed off the original is gui ded to the surface of the PC
Drum and reduces the level of the negative charges, thereby forming an electrostatic
latent image.
(For mor e details, see “9. OPTICAL SECTION”.)

5. Developing
Toner positively charged in the Developer Mixi ng Chamber is attracted onto the electro­static lat ent i mage c ha ngin g it to a v is ib le , devel oped i ma ge. A DC negat ive bias v oltag e i s
applied to t he Sle eve/Magn et Roller to pr event toner from being a ttr ac te d onto th os e area s
of the PC Drum which correspond to the background areas of the original .
(For mor e details, see “11. DEVELOPMENT”.)

M-4

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

6. Paper Feeding
Pape r is fed either au tomatically fro m the 1st or 2nd Drawer, or manually via the Multi
Bypass Table or Manual Bypass Table. Each Dra wer has fingers that function to separate
the top sheet of paper from the rest at take-up. (2nd Drawer: 23 cpm Copier Only )
(For more details, see “13. PAPER TAKE-UP/FEED SECTION”.)

7. Image Transfer
The single-wir e Image Transfer C orona Uni t ap plies a DC neg ati v e c orona emi ssi on to t he
underside of the paper, thereby attracting toner onto the surface of the paper.
(For more details, see “16. IMAGE TRANSFER AND PAPER SEPARATION”.)

8. Paper Separation
The single-wire Paper Separator Cor ona Unit applies an AC corona emission to the
underside o f the p ape r to neutr al i ze t he pap er. In addition, mechanic al paper s epa rati o n is
provided by the two PC Drum Paper Separator Fingers fitted to the Imaging Unit.
(For more details, see “16. IMAGE TRANSFER AND PAPER SEPARATION”.)

9. Cleaning
Residual toner on the surface of the PC Drum is scraped off by the Cleani ng Blade.
(For mor e details, see “19. CLEANING UNIT”.)

10.Main Erase
Light from the Main Erase Lamp neutralizes an y surface potential remaining on the sur­face of the PC Drum after cleaning.
(For mor e details, see “17. MAIN ERASE LAMP”.)

11. Transport
The paper is fed to the Fusing Unit by the Suction Belts.
(For more details, see “20. PAPER TRANSPORT”.)

12. Fusing
The developed imag e is permanently fused to the paper by a combi nation of heat and
pressure applied by the Upper and Lower Fusing Rolle rs.
(For more details, see “21. FUSING UNIT”.)

13.Paper Exit
After the fusing process the paper is fed out by the Paper Exit Roller onto the Copy Tray.
(For mor e details, see “22. EXIT UNIT”.)

M-5

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

1174SBM0300A

3 DRIVE SYST EM

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

Drive Train for Lower Half of Copier

Coupled to Paper
Take-Up Unit

Drive Train for
Paper Take-Up Unit
<23 cpm Copier>

Coupled to Copier Gear

1st Vertical
Transport Roller

2nd Vertical
Transport Roller

1139M004AA

Coupled to Exit/Duplex
Switching Unit

Paper Exit Roller Drive

Suction Unit
Drive

Synchronizing Roller Clutch CL 1

Pape r Transport
Clutch CL 2

<15/18 cpm Copier >

1st Draw er Paper
Take-Up Roll

Vertical
Transport Roller

2nd Drawer P ape r
Take-Up Roll

Main Drive Motor M2

1151M001YB

Drive Train for Upper
Half of Copier

PC Drum Drive

Imaging Uni t
Drive

1139M005 AA

PC Drive Motor M1

Coupled to Copier Gear

Paper D rawer Paper
Take-Up Roll

1142M002AA

Upper Fusing
Roller Drive

M-6

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

1174SBM0400A

4 SEQUENTIAL EXPLANATION

Numbers given in rectangles in the following flowchart are timer values in seconds.

✽

A The power cord is plugged into the outle t.

Power cord is plugged in.

ON

AC24V for Drum heating (Transformer)

ON

B Power Switch is turned ON.

Power Switch ON

ON

ON
ON

ON

Drum Dehumidifying
Heater

ON

Paper Dehumidifying
Heater

DC5V (Power Supply Unit)

DC24V (Power Supply Unit)
Control panel
The Cooling Fan turns at full speed.

Approx. 3

Approx. 1

ON

ON
ON

The Cooling Fan turns at half speed.

Fusing Heater Lamp

Scanner Reference Position Sensor

Only when Dehumidifying
Switch is ON

✽If the S cann er i s n ot at the home posi ti on, Scan ner Mot or i s

energi z ed to move the Scanner to the home position.

ON

Lens Reference Position Sens or

✽If the Lens is not at the home position, Lens Motor is

ON

energized to move the Lens to the home position.

Mirror Reference Position Sensor

✽If the 4th Mirror is not at the home position, Mirror

Motor is energized to move the Mirror to the home

Start er setup and ATDC Sensor a ut omatic adjustment

position.

✽Only when the Imaging Unit is new. I/U Fuse blows when the

starter setup sequence is completed normally.

M-7

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

C The Fusing Unit temperature reaches 205°C.

Fusing Thermistor detects 205°C.

ON/OFF

Fusing Heater Lamp

✽The Fusing Unit temperature control is started.

M-8

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

D The Start Key is pressed.

Start Key ON

ON

PC Drive Motor

ON

ON
ON

Main Erase Lamp

Main Drive Motor
Image Erase Lamp

✽All LEDs are turned ON.

ON
ON

ON

Developing Bias (High Voltage Unit)
Paper Separator Corona (High Voltage Unit)

Cleaning Bias (High Voltage Unit)

✽Some model s ha v e n o Bia s Seal ins tal led de pendi ng o n

ON

their marketing areas.

Synchronizing Roller Clutch ✽For appr ox 0.2 sec. onl y

Approx. 0.3

Approx. 0.2

ON

1st/2nd Drawer Paper Take-Up Solenoid

1st/2nd D r awer Paper Take-Up

Approx. 0.1

ON

PC Drum Charge Corona/Image Transfer Corona

OFF

Solenoid (2nd Drawer Paper Take­Up Solenoid: 23 cpm copier only)

Approx. 0.2

Approx. 2.5

ON

Paper Transport Clutch

ON

Synchr onizing Roller C lutch

E Paper is taken up.

1st/2nd Drawer Paper Take-Up Solenoid ON
(2nd Drawer Paper Take-Up Solenoid: 23 cpm copier only)

Approx. 0.4

1

ON

1st/2nd Drawer Paper Take-Up Sensor

1st Drawer :
Approx. 0.7
2nd Drawer:
Approx. 1.4
(23 cpm copier
Only)

ON

Approx. 0.5

Approx. 0.2

M-9

Transport Roller S ensor

ON

Paper Leading Edge
Detecting Sensor

Approx. 0.2

ON

Exposure Lamp

OFF

Paper
Transport
Clutch

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

1

ON

Approx. 0.5

Scanner Motor

OFF

Scanner Reference Position Sensor

Approx. 0.2

Approx. 0.5

F A scan motion is completed.

SCEND signal: LOW

Approx. 0.2

Approx. 0.3

ON

All LEDs of Image Erase Lamp ON

Scanner starts return motion.

Approx. 0.6

✽For A4 crosswise, ×1.000

Approx. 0.3

OFF

Exposure Lamp

Image Erase Lamp LEDs ON/OFF control is started.

ON

Synchronizing Roller Clutch

ON

Paper Transport Clutch

ON

Scanne r Reference Positio n Sensor

M-10

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

G The last paper moves past Transport Roller Sensor.

Transport Roller Sensor OFF

Approx. 0.6

Approx. 0.9

Approx. 1.2

OFF

Paper Leading Edge Detecting Sensor

OFF

Approx. 0.4

Approx. 0.7

Approx. 0.5

ON

1st Paper Exit Sensor

OFF

Paper Transport Clutch

Synchronizing Roller Clutch

OFF

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

Approx. 0.7

OFF
OFF

OFF

OFF

PC Drive Motor

OFF

Main Erase Lamp

OFF

Image E ra se Lamp

Developing Bias (High Voltage Unit)
Cleaning Bias (High Voltage Unit)

✽Some mode ls have no Bias Seal installed

depending on their marketing areas.

Paper Separator Corona (High Voltage Unit)

H The paper moves past 1st P aper Exit Sensor.

1st Paper Ex i t S ensor OFF

Approx. 1.5

OFF

Main Drive Motor

M-11

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

1174SBM0500A

5 IMAGING UNI T

This copier is equipped w ith an Imagi ng U nit, or IU, which in tegrates a PC Drum, PC Drum
Charge Corona, Developing Unit, Cleaning Unit, and Toner Recycling mechanism into one
assembly. The Unit also includes the Upper Synchronizing Roller which facilitates clearing
of a paper misfeed.

Corona Unit Cleaning
Lever

Counter

Toner Supply Port

PC Drum
Charge Corona

Coupled to Gear in
Copier

PC Drum

Developer Mixing Chamber

1139M009AA 1139M010AA

Paper Separator Fingers

Upper Synchronizing Roller

1174M014AA

Paper Guide Plate

M-12

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

1174SBM0501A

5-1. Imaging Unit Drive

Drive for the Imaging Unit is transmitte d by one of the gears on the Unit.
This particular gear is in mesh with the Imaging Unit Drive Gear in the copier.

Dev eloper Mixing Screw Drive Gear

Bucket Roller Drive Gear
Imaging Unit Drive
Gear (in Copier)

Sleeve/Magnet Roll er
Drive Gear

Coupling (in Copier)

1139M012AA

T oner Recycling Coil
Drive Gears

M-13

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

1174SBM0502A

5-2. Imaging Unit Toner Recycling

The copier is provided with a ton er recycling mechanism . The toner, which has been
scraped o ff t he surface of the PC Drum by the C lean ing Bla de and c olle cted in t he Clean ing
Unit, is conv e y ed by the tw o Toner Recycling Coils t o the Toner Supply Port and, fr om there ,
it is returned back to the Developer Mixing Chamber of the Developing Unit.

One of the gears of the Toner Recycling mechanism rece ives drive through a gear at the
rear end of the PC Drum.

Toner Supply Port

Toner Recycling Path

Toner Recycling Coil

Bev el Gears

1139M013AA

Toner Recycling Coil

1174SBM0503A

5-3. Imaging Unit Fu se

The Imaging Unit is provided with a fuse called the I/U Fuse. When a new Imaging Unit is
installed in the copier and the Power Switch turned ON, an I/U Set signal is output c ausing
the copier t o st art the starter setup sequence and ATDC Sensor automatic adjustment.

When the starter setup sequence is compl eted normally, an I/U Fuse Blow signal is output
to blow the I/U Fuse. Once the I/U Fuse is b lown, the I/U Set signals are no longer output.
This means that the starter setup sequence and ATDC Sensor automatic adjustment will
not be carried out w hen the Po w er Switch is ther eafter turned ON.

Control Signal

When Fuse is

not Blown

Fuse PWB- A PJ 1 0 A- 6 H L 2-I

When Fuse is

Blown

WIRING DIAGRAM

M-14

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

1174SBM0600A

6 PC DRUM

The photoconductive drum used in t his copier is the organi c photoconductor (OPC) type.
The drum is made up of two disti nct, semiconductive materials on an aluminum all oy base.
The outer of the tw o l a yers is calle d the C har ge Transport Lay er ( CTL ), wh il e the i nner layer
is called the Ch arge Generating Layer (CGL).

The PC Drum has its grounding point in side 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. I t must theref ore be protected from light by a clean, s oft cloth
whenever the Imaging U ni t 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

Grounding
Plate

PC Drum

Gear

1139M006AA

PC Drum Drive Coupling Gear

CTL

CGL

Aluminum
Cylinder

1139M007AA

Shaft

Grounding Point

1139M008AA

M-15

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

1174SBM0700A

7 DRUM CHARGING

The PC Drum Charge Cor ona ha s a Scor otron grid t o depo si t a negat iv e D C charg e evenly
across the surface of the PC Drum. The grid voltage (VG) applied to the grid mesh is
selected bet w een - 650V i n the no rmal mode and -520V in th e Ph ot o mode b y the Co nsta nt­Voltage Circui t in the High Voltage Unit.

The Corona Unit has a Comb Electrode which minimizes the amount of ozone produced.
The conventional wire type corona unit pro duces a large amount of ozone due to corona
discharge in ra di al dir ecti ons. The comb electro de t ype , on the ot he r hand, di sc har ges 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 Roller is mounted.

PC Drum

Charge Corona

Grid Voltage

(VG)

Holder

Comb Electrode

Spring

Holder

1139M030AA

Grid Mesh

Control Signal ON OF F WIRING DIAGRAM

PWB-A PJ11A-9A L H 4-C

Control Signal

Normal

Mode

Photo Mode WIRING DIAGRAM

PWB-A PJ11A-10A L H 4-C

1174T20MCA

M-16

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

1174SBM0800A

8 IMAGE ERAS E LAMP

To prevent a b lack band fro m occ urring across both the leading and trailing edges, and
along the front and rear edges, of the electrostatic latent i m age, 31 LEDs of the Im age
Erase Lamp are turned ON before development takes place, thereby reducing to a mini­mum the unnecessary potential on the surface of t he PC Drum. Because of the light path
involved, this copier has the edge erasing cycle between drum chargi ng and exposure.

PC Drum Charge Corona

Image Erase Lamp LA3

Exposure

1139M031AA

The position of the Image Eras e Lamp can be adjusted using the adjusting screw on the
front of the copier.

Copier F r ont Frame

Copier Rear
Frame

Compression
Spring

Image Erase Lamp

1139M032AA

Image Erase La mp

Adjusting Screw

M-17

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

The 31 LEDs of the Image Erase Lamp are grouped as shown below. The table at the bot ­tom of this pag e sho ws wh ich LE Ds turn ON and OFF f o r dif f ere nt paper s iz es an d dif f e rent
zoom r atio s.

LED Group No. LED No. LED Group No. LED No.

00 LED 1 10 LED 23
01 LED 2 to 6 11 LED 24
02 LED 7 to 11 12 LED 25
03 LED 12 to 16 13 LED 26
04 LED 17 14 LED 27
05 LED 18 15 LED 28
06 LED 19 16 LED 29
07 LED 20 17 LED 30
08 LED 21 18 LED 31
09 LED 22

The smaller the number , the nearer the LED i s to the front side of the copier.

✽

LED ON/OFF Pattern

Zoom Ratio Paper Width LED Group No.

From - To

Less Than

(%)
50~53 to 152
53~57 152 to 163
57~61 163 to 173
61~64 173 to 183
64~67 183 to 192
67~70 192 to 201
70~74 201 to 212
74~78 212 to 223
78~82 223 to 235
82~86 235 to 247
86~90 247 to 259
90~93 259 to 270
93~96 270 to 281
96~99 281 to 291

99~ 291 to

: ON;

–

❍

Max. width (291 mm or more) applies to manu al bypass copying in which the copier is

✽

unable to detect paper width.

: OFF

From - To

Less Than

(mm)

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

–––

❍

––––

❍

–––––

❍

––––––

❍

–––––––

❍

––––––––

❍

–––––––––

❍

––––––––––

❍

–––––––––––

❍

––––––––––––

❍

–––––––––––––

❍

––––––––––––––

❍

–––––––––––––––

❍

––––––––––––––––

❍

–––––––––––––––––

❍

❍❍❍❍❍❍❍❍❍❍❍❍❍❍❍

❍❍❍❍❍❍❍❍❍❍❍❍❍❍

❍❍❍❍❍❍❍❍❍❍❍❍❍

❍❍❍❍❍❍❍❍❍❍❍❍

❍❍❍❍❍❍❍❍❍❍❍

❍❍❍❍❍❍❍❍❍❍

❍❍❍❍❍❍❍❍❍

❍❍❍❍❍❍❍❍

❍❍❍❍❍❍❍

❍❍❍❍❍❍

❍❍❍❍❍

❍❍❍❍

❍❍❍

❍❍

❍

M-18

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

Control Signal ON OFF WIRING DIAGRAM

LA3 PWB-A PJ16A-4A ~ 9A L H 1-G

1174T22MCB

M-19

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL

98.04.24

1174SBM0900A

9 OPTICAL SECTION

As the Scanner is moved by the Scanner Motor, the light from the Exposure Lamp is
reflecte d off the original and gui ded through the four Mirrors onto the surface of the PC
Drum to form the electrostatic la tent image.

The image is enlarged or reduced as necessary by changing the position of the Lens and
4th Mirror and varying the angle of the 4th Mirror.

23 cpm Copier

•

4th Mirr o r

Mirror Motor M7

Scanner

Lens Motor M6

AE Sensor Board
(PWB-H)

Scanner Motor M5

15/18 cpm Copier

•

Scanner Motor M5

Scanner Shaft

Lens

2nd/3rd Mirrors
Carriage

1149M008AA

1139M033AA

M-20

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL

98.04.24

1174SBM0901A

9-1. Exposure Lamp

An AC halogen lamp is used as the Exposure Lamp.

As the exposure le vel is adjust ed on the control panel, the duty ratio of the pulse of AVR
Remote from the Master Board changes t o i ncrease or decrease the Exposure Lamp v olt­age, the r eby changing the image density.

In Photo mode , the v ol tage s are varied on a level 5V lo w er th an the ma n ual Ex posu re L amp
voltage s .

Manual EXP Setting9876 5 432✽1
Lamp Voltage

Diffe rence (V)

At Manual Exp osure Setting 1 only VG is reduced, thereby gi ving a lamp Voltage differ-

✽

ence equivalent to +8V.

–8 –4 –2 –1 Reference +1 +2 +4 +4

1174T13MCA

Control Signal ON OFF WIRING DIAGRAM

AVR Remote

Signal (LA1)

If reduction copie s are made using large size pa per, the trailing edge of the first copy

✽

moves past the Transport Roller Sensor after the SCEND signal for the second copy has
been generated. If the Exposure Lamp is turned ON for the sec ond copy at the same tim­ing as the first one, therefore, the imag e for the second copy is produced on the trailing
edge of the fi rs t copy. T o p revent thi s f rom o ccurrin g, th e E xpos ure Lamp i s tu rned ON for
the second and subs equent copies whe n all of the foll owing conditions are met:
Approx. 0.8 sec. or more have elapsed after the first cop y deactiva ted the Transport

•

Roller Sensor.
The Transport Roller Sensor output i s HIGH.

•

The SCEND signal for the secon d copy is output.

•

PWB-A PJ14A- 3 L H 6-D

M-21