Konica 7832 SERVICE HANDBOOK 7832010e

7832

SERVICE HANDBOOK

Dec. 2000

Ver. 1.0

KONICA CORPORATION

TECHNOLOGY SUPPORT CENTER

TOKYO JAPAN

KCS783210

INDEX (GENERAL)

GENERAL

MECHANICAL/ELECTRICAL

Blank page

GENERAL

Blank page

CONTENTS

1. SAFETY INFORMATION .................................................................................G-1

1-1. Laser Safety .............................................................................................G-1

1-2. Internal Laser Radiation ...........................................................................G-1

1-3. CDRH Regulations ..................................................................................G-2

1-4. Laser Safety Label ...................................................................................G-4

1-5. Location of Laser Warning Labels ...........................................................G-4

2. SPECIFICATIONS ...........................................................................................G-7

3. PRECAUTIONS FOR INSTALLATION ............................................................G-10

4. PRECAUTIONS FOR USE ..............................................................................G-11

5. HANDLING OF THE CONSUMABLES ...........................................................G-12

6. OTHER PRECAUTIONS .................................................................................G-12

7. SYSTEM OPTIONS .........................................................................................G-13

8. HIGHLIGHTS ...................................................................................................G-14

i

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1. SAFETY INFORMATION

1-1. Laser Safety

This is a digital copier which operates by means of a laser. There is no possibility of danger
from the laser, provided the copier is operated according to the instructions in this manual.

Since radiation emitted by the laser is completely confined within protective housing, the
laser beam cannot escape from the copier during any phase of user operation.

This copier is certified as a Class 1 laser product. This means the copier does not produce
hazardous laser radiation.

1-2. Internal Laser Radiation

Maximum Average Radiat Power: 78.1 µW at the laser aperture of the upper print head
assy.

Wavelength: 675-695 nm

This product employs a Class
The Laser Diode and the Scanning Polygon Mirror are Incorporated in the print head assy.
The print head assy is NOT A FIELD SERVICE ITEM.
Therefore, the print head assy should not be opened under any circumstances.

III

b Laser Diode that emits a laser beam.

Upper Print Head Assy

G-1

Lower Print Head Assy

1179O070AA

1-3. CDRH Regulations

For the United States

This copier is certified as a Class I Laser product under Radiation Performance Standard
according to the Food, Drug and Cosmetic Act of 1990. Compliance is mandatory for Laser
products marketed in the United States and is reported to the Center for Devices and
Radiological Health (CDRH) of the U.S. Food and Drug Administration of the U.S. Depart­ment of Health and Human Services (DHHS). This means that the device does not produce
hazardous laser radiation.

The label shown to page G-4 indicates compliance with the CDRH regulations and must be
attached to laser products marketed in the United States.

CAUTION:

Use of controls, adjustments or performance of procedures other than those specified in
this manual may result in hazardous radiation exposure.

This is a semiconductor laser. The maximum power of the laser diode is 35 mW and the
wavelength is 675-695 nm.

For European Users

CAUTION:

Use of controls, adjustments or performance of procedures other than those specified in
this manual may result in hazardous radiation exposure.

This is a semiconductor laser. The maximum power of the laser diode is 35 mW and the
wavelength is 675-695 nm.

For Denmark Users

ADVARSEL

Laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse
for stråling. Klasse 1 laser produkt der opfylder IEC60825 sikkerheds kravene.

Dansk: Dette er en halvlederlaser. Laserdiodens højeste styrke er 35 mW og
bølgelængden er 675-695 nm.

G-2

For Finland, Sweden Users

LOUKAN 1 LASERLAITE
KLASS 1 LASER APPARAT

VAROITUS!

Laitteen Käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa altistaa
käyttäjän turvallisuusluokan 1 ylittävälle lasersäteilylle.

Tämä on puolijohdelaser. Laserdiodin suurin teho on 35 mW ja aallonpituus on 675-695
nm.

VARNING!

Om apparaten används på annat sätt än i denna bruksanvisning specificerats, kan använ­daren utsättas för laserstrålning, som överskrider gränsen för laserklass 1.

Det här är en halvledarlaser. Den maximala effekten för laserdioden är 35 mW och
våglängden är 675-695 nm.

VARO!

Avattaessa ja suojalukitus ohitettaessa olet alttiina lasersäteilylle. Älä katso säteeseen.

VARNING!

Laserstrålning när denna del är öppnad och spärren är urkopplad. Betrakta ej strålen.

For Norway Users

ADVERSEL

Dersom apparatet brukes på annen måte enn spesifisert i denne bruksanvisning, kan
brukeren utsettes for laserstråling som overskrider grensen for laser klass 1.

Dette en halvleder laser. Maksimal effekt till laserdiode er 35 mW og bølgelengde er 675­695 nm.

G-3

1-4. Laser Safety Label

A laser safety labels is attached to the outside of the copier shown below.

For Europe

CLASS 1 LASER PRODUCT
LASER KLASSE 1 PRODUKT

For United States

KONICA CORPORATION

1-26-2, Shinjuku Nomura Building No.26-2,
Nishishinjuku 1-chome, Shinjuku-ku, Tokyo 163-0512, Japan

MANUFACTURED :

THIS PRODUCT COMPLIES WITH 21 CFR
CHAPTER I , SUBCHAPTER J .

1-5. Location of Laser Warning Labels

Inside the Copier (Front)

1154-7411-01

1179M037CA

1179O075AA

G-4

1179O077AA

Internal Right Side View

1179O080AA

1179O079AA

Rear Side View

1179O069AB

1179O076AA

G-5

1179O078AA

1179O078AA

ALL Areas

Danger of explosion if battery is incorrectly replaced.

CAUTION

Replace only with the same or equivalent type

recommended by the manufacturer.
Dispose of used batteries according

to the manufacturer’s instructions.

Denmark only

Norway only

Sweden only

Finland only

ADVARSEL!

Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering

Udskiftning må kun ske med batteri

af samme fabrikat og type.

Levér det brugte batteri tilbage til leverandøren.

ADVARSEL
Eksplosjonsfare ved feilaktig skifte av batteri.
Benytt samme batteritype eller en tilsvarende

type anbefalt av apparatfabrikanten.

Brukte batterier kasseres i henhold til fabrikantens

instruksjoner.

VARNING

Explosionsfara vid felaktigt batteribyte.

Använd samma batterityp eller en ekvivalent

typ som rekommenderas av apparattillverkaren.

Kassera använt batteri enligt fabrikantens

instruktion.

VAROlTUS

Paristo voi räjähtää, jos se on virheellisesti asennettu.

Vaihda paristo ainoastaan laitevalmistajan suosittelemaan

tyyppiin. Hävitä Käytetty paristo valmistajan ohjeiden

mukaisesti.

G-6

2. SPECIFICATIONS

Type Freestanding
Platen Type Stationary
Original Scanning Sequential scanning of different colors with a reduction-type color

CCD (RGB 3 lines each comprising 7,500 pixels)
Scanning Density 600 dpi × 600 dpi
Print Density 1800 dpi equivalent × 600 dpi
Copying System Electrostatic dry-powdered image transfer to plain paper
Paper Feeding System Four-way system

• Multi Bypass Table: 90 sheets of paper

• Middle Drawer (universal type): 250 sheets of paper

• Upper and Lower Drawer (fixed-size type): Each holding up to

500 sheets of paper

Exposure System Laser Diode 1 + Polygon Mirror
Developing System Micro-Toning System
Charging System Scorotron system (single-wire DC (–) + grid mesh)
Paper Attraction

System
Image Transfer

System
Paper Separating

System
Transfer Film Cleaning

System
PC Drum Cleaning

System
Ozone Removal

System
Fusing System Two lamp-heated rollers
Transfer Film Charge

Neutralizing
PC Drum OPC-MLII (Organic Photoconductor)
Types of Originals Sheet, book, and three-dimensional objects weighing up to 2 kg.
Maximum Size of

Original
Copy Paper Size Multi Bypass Table: Metric - A3 wide L (305 mm × 457 mm) to

Static charge attraction system (corotron charger + attraction

roller + backup mechanism)

Static image transfer system (corotron charger + backup mecha-

nism)

Static charge separating system (corotron charger + separator

fingers + film pressure mechanism)

Fur Brush (bias 0 or 360 V) + Oil Roller (900 V)

Cleaning Blade + PC Drum Charge Neutralizing Corona

Ozone Filters

Static charge neutralizing (corotron charger)

Metric - A3L

Inch - 11 × 17L

A5L, A6 thick paper
Inch - 12 × 18 to 5-1/2 × 8-1/2L,
4 × 6 thick paper

Upper/Middle/Lower Drawer: Metric - A3L to A5L

Inch - 11 × 17L to 5-1/2 × 8-1/2L

G-7

Copy Paper Type:

1st to 3rd Drawers

(automatic feeding)

Plain paper (64 to 90 g/m2)
Translucent paper ——
OHP transparencies (dedicated) —

Thick paper 1 (91 to 128 g/m

Thick paper 2 (129 to 209 g/m

Copy paper

A6 thick paper (Metric)
4 × 6 thick paper (Inch)

Recycled paper ——
Max. (width × length mm) 297 × 432 mm 305 × 457 mm

Min. (width × length mm) 140 × 182 mm

Dimensions

❍

: Reliably fed —: Unreliably fed

✽

1: Reliably fed if 90 sheets or less.

✽

2: Reliably fed if 40 sheets or less.

✽

3: Reliably fed if 30 sheets or less.

2

)

2

)

❍❍ ✽

—

—

—

Multi Bypass Table

1

2

❍ ✽

2

❍ ✽

2

❍ ✽

3

❍ ✽

140 × 182 mm
[A6 thick paper
105 × 148 mm (Metric)
4 × 6 thick paper
102 × 152 mm (Inch)]

Warming-up Time Approx. 9 min. at ambient temperature of 20 °C and rated source

voltage
Warming-up Time

60 sec. or less
After Energy Saver
Mode

First Copy Time (Upper Drawer, ×1.000, manual color selection)

Area Paper Size Full Color Mono Color

Inch 8-1/2 × 11C

Metric A4C

21 sec. 10 sec.

Copying Speed for Multi-Copy Cycle (Upper Drawer, ×1.000) (copies/min.)

Area Paper Size Full Color Mono Color

A3L

Metric

Inch

B4L
A4L
B5L

A4C

A5L

11 × 17L
8-1/2 × 11L
8-1/2 × 11C

5-1/2 × 8-1/2L

416

832B5C

416

832

G-8

Multiple Copies 1 to 99 copies (count-down system)
Zoom Ratios

Full size

Fixed

Enlargement

Reduction

Variable

Inch

Metric

Inch

Metric

×

1.214, ×1.294, ×2.000

×

1.154, ×1.224, ×1.414

×

0.647, ×0.733, ×0.785

×

0.707, ×0.816, ×0.866

×

0.250 to ×6.000 (in 0.001 increments)

1.000

×

Void Image Width Leading edge: 5 mm

Trailing edge: 4 mm
Front/rear edge: 3 mm [4 × 6 thick paper (Inch), A6 thick paper

(Metric); 5 mm]
Lens Through lens (F = 5, f = 79 mm)
Light Source Halogen frost tube lamp
Fusing Temperature Upper Fusing Roller surface temperature: 160 °C

Lower Fusing Roller surface temperature: 170 °C
Power/Current Consumption

Exposure Lamp

(Rating)

70 V

150 W

Fusing Roller Heater

Lamp (Rating)

120 V, 220-240 V

Upper: 650 W
Lower: 400 W

Max. Power

Consumption

1500 W 13 A/7 A

Max. Current
Consumption

Power Requirements 120 V, 220-240 V; 50 Hz/60 Hz
Environmental Conditions

Temperature Humidity Ambient Illumination Levelness

10 to 32 °C with a

fluctuation of 10 °C or

less per hour

15 to 85 % with a fluc­tuation of 10 % or less

per hour

3000 lx or less 1° or less

Dimensions 640 (W) × 765 (D) × 994 (H) mm (H: Up to Original Glass surface)

640 (W) × 765 (D) × 1024 (H’) mm (H’: Up to Original Cover)
Weight 215 kg
Standard Accessories Exit Tray, Operator’s Manual Holder
Options • Duplexing Document Feeder

DF-724

• ADF Kit 7823

• 10 Bin Staple Sorter ST-724

• 10 Bin Sorter ST-723

• Printer Controller Fiery Z4

08C-M

• VI Kit VI-631

• Large Capacity Cassette

LT-723

• Duplex Unit AD-723

• Printer Controller Fiery X3e

08C-M

• VI Kit VI-632

G-9

3. PRECAUTIONS FOR INSTALLATION

Installation Site

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

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

• Which is exposed to direct sunlight.

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

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

• Which has poor ventilation.

• Where ammonia gas might be generated.

• Which does not have a stable, level floor.

• Where it will be subjected 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.

• Which is near any kind of heating device.

• Where it may be splashed with water.

• Which is dirty or where it will receive undue vibration.

• Which is near volatile flammables or curtains.

Power Source

Use an outlet with a capacity of 120 V/13 A, or 220-240 V/7 A or more.

• If any other electrical equipment is sourced from the same power outlet, make sure that
the capacity of the outlet is not exceeded.

• Use a power source with little voltage fluctuation.

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

outlet being used for the copier.

• Make the following checks at frequent intervals:

✽

Is the power plug abnormally hot?

✽

Are there any cracks or scrapes in the cord?

✽

Has the power plug been inserted fully into the outlet?

✽

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

• 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.

Grounding

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

• Connect the grounding wire to:

✽

The ground terminal of the outlet.

✽

A grounding contact which complies with the local electrical standards.

• Never connect the grounding wire to a gas pipe, the grounding wire for a telephone, or a
water pipe.

G-10

4. PRECAUTIONS FOR USE

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

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

• 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.

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

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

• Never use flammable sprays near the copier.

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

unplug it.

• Do not turn ON the Power Switch at the same time when you plug the power cord into
the outlet.

• When unplugging the power cord, do not pull on the cord; hold the plug and pull it out.

• Do not bring any magnetized object near the copier.

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

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

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

Operating Environment

The operating environmental requirements of the copier are as follows.

• Temperature: 10 °C to 32 °C with a fluctuation of 10 °C per hour

• Humidity: 15 % to 85 % RH with a fluctuation of 10 % per hour

Power Requirements

The power source voltage requirements are as follows.

• Voltage Fluctuation: AC120 V, 220-240 V

• Frequency Fluctuation: 50/60 Hz ±0.3 %

±10 % (Copying performance assured)
–15 % (Paper feeding performance assured)

G-11

5. HANDLING OF THE CONSUMABLES

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

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

• 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.

• Keep consumables out of the reach of children.

• Do not touch the PC Drum with bare hands.

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

away from any heating apparatus.

• 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.

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

• 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.).

6. OTHER PRECAUTIONS

The Printerhead of this copier uses a laser diode that emits a laser beam. Use the following
precautions when performing service jobs at the users’ premises.

• When a service job needs to be performed in the laser beam path, such as when working
around the printerhead and PC Drum, be sure first to turn the copier OFF.

• If the job requires that the power cord be left plugged in, observe the following precau­tions

1. Take off your watch, ring, and any other reflective object and wear laser protective gog-

gles.

2. At the job site, select a place that is as far as possible away from the users and that is

enclosed by walls.

3. Do not bring a highly reflective tool into the laser beam path during the service job.

G-12

7. SYSTEM OPTIONS

1

1151O007AA

6

1144O184AA

5

1139O0020A

1. Duplexing Document Feeder DF-724

2. Large Capacity Cassette LT-723

3. Printer Controller Fiery X3e 08C-M

4. Printer Controller Fiery Z4 08C-M

1154O028AA

1179O014AA

1179M558AA

1179O046AA

5. 10 Bin Staple Sorter ST-724
10 Bin Sorter ST-723

6. Duplex Unit AD-723

2

3

4

G-13

8. HIGHLIGHTS

1. High-quality image reproduction

• HYPER DASH LIMOS & FEET processing.

2. Greater ease of operation

• Employs a touch panel display.

• Equipped with two image quality adjustment modes, “Color Adjust Mode (Basic)” and
“Color Adjust Mode (Professional).”

• Photo mode and Postcard

• ACS mode

• Capable of automatically determine the type of the original, whether it is a photo, text, or

a map, to set the most appropriate copy function.

• Color Auto Exposure function

• Copy track function by means of specific access codes that can be entered from the 10-

Key Pad.

3. Higher productivity

• Efficient, high-speed 2-sided printing with four sheets of paper being resident along the
paper path inside the copier.

4. Environmental consciousness

• Fuser oil recycling system

• Two-sheet attraction for a lower system speed and lower operating noise without sacrific-

ing productivity.

• The reduced number of drive-transmitting parts means a reduced number of noise
sources.

• Lower concentration of ozone by means of the Ozone Filter.

• Uses recyclable plastic materials.

• No harmful substances are used.

5. Better serviceability

• Unitized construction for greater serviceability

• Version upgraded by a flash memory card

G-14

MECHANICAL/

ELECTRICAL

CONTENTS

1. CROSS-SECTIONAL VIEW AND PAPER PATH ............................................M-1

2. COPY PROCESS ............................................................................................M-2

3. DRIVE SYSTEM ..............................................................................................M-5

4. OPERATING SEQUENCE ..............................................................................M-6

5. CONTROL BLOCK DIAGRAM ........................................................................M-13

6. IMAGE STABILIZATION SYSTEM ..................................................................M-14

6-1. Image Stabilization System Overview .....................................................M-14

6-2. Image Stabilization System Control .........................................................M-15

(1) V detection during multi-copy cycles ...............................................M-16

(2) AIDC detection during multi-copy cycles .........................................M-16

(3) Evaluation of whether or not to run image stabilization ...................M-16

(4) AIDC background adjustment ..........................................................M-16

(5) LDC detection ..................................................................................M-17

(6) Image formation Vg/Vb setting ........................................................M-17

(7) Series gradation detection ...............................................................M-17

(8) Density conversion by density table ................................................M-18

7. PC DRUM SECTION .......................................................................................M-19

7-1. Grounding of the PC Drum ......................................................................M-19

7-2. PC Drum Drive Mechanism .....................................................................M-20

7-3. PC Drum Temperature Control ................................................................M-21

8. PC DRUM CHARGING SECTION ...................................................................M-22

8-1. PC Drum Charge Corona ON/OFF Control .............................................M-22

8-2. PC Drum Charge Corona Wire Cleaning Mechanism .............................M-23

8-3. PC Drum Charge Section Ozone Filter ....................................................M-24

9. IMAGE READER (IR) SECTION .....................................................................M-25

9-1. IR Image Processing ...............................................................................M-26

9-2. CCD Sensor .............................................................................................M-35

9-3. Exposure Components Section ...............................................................M-36

9-4. Exposure Lamp Control ...........................................................................M-37

9-5. Scanner and 2nd/3rd Mirrors Carriage Movement Mechanism ...............M-38

9-6. Scanner Motor Drive Control ...................................................................M-39

9-7. IR Section Cooling Fan Motor Mechanism ..............................................M-41

9-8. Original Size Detecting Section ...............................................................M-42

(1) Original Size Detecting Sensors ......................................................M-42

(2) Original Size Detection Timing ........................................................M-43

(3) Determining Original Size ................................................................M-44

10. PRINTERHEAD (PH) SECTION ......................................................................M-46

10-1.Image Processing Block Diagram ...........................................................M-47

10-2.Laser Exposure Process .........................................................................M-50

10-3.Laser Emission Timing (SOS Signal) ......................................................M-51

10-4.Laser Emission Area ...............................................................................M-52

10-5.HYPER DASH LIMOS and FEET ............................................................ M-53

11. DEVELOPING UNIT SECTION .......................................................................M-54

11-1.Developing Unit Drive Mechanism ..........................................................M-55

11-2.Developer Flow ........................................................................................M-57

11-3.Developing Bias and ATDC Bias .............................................................M-59

i

11-4.ATDC Sensor ..........................................................................................M-60

11-5.AIDC Sensor ............................................................................................M-62

11-6.Black Toner Replenishing Control ...........................................................M-63

11-7.Auxiliary Toner Replenishing Mechanism ...............................................M-64

11-8.Toner Suction Fan Motor ......................................................................... M-65

11-9.Pre-Image Transfer Corona .....................................................................M-66

11-10.Pre-Image Transfer Corona Output Control ..........................................M-67

11-11.Pre-Image Transfer Corona ON/OFF Control .......................................M-67

11-12.Pre-Image Transfer Corona Output Stabilization Control ......................M-67

12. TONER HOPPER SECTION ...........................................................................M-68

12-1.Toner Replenishing Mechanism ..............................................................M-69

12-2.Toner Empty Detection Control ...............................................................M-71

13. PAPER TAKE-UP/FEED SECTION ................................................................M-72

13-1.Universal Tray Paper Size Detection Mechanism ...................................M-73

13-2.Drawer-in-Position Detection Mechanism ...............................................M-75

13-3.Drawer Paper Lifting/Lowering Mechanism .............................................M-76

13-4.Paper Empty Detection Mechanism ........................................................M-78

13-5.Paper Take-Up Mechanism ..................................................................... M-79

13-6.Paper Dehumidifying Heaters and Humidity Sensor ...............................M-82

13-7.Vertical Transport Drive Mechanism .......................................................M-83

13-8.Paper Take-Up Control ............................................................................M-84

14. MANUAL FEED TABLE SECTION ..................................................................M-86

14-1.Manual Feed Paper Take-Up Mechanism ............................................... M-86

14-2.Manual Feed Take-Up Control ................................................................M-87

14-3.Manual Take-Up Roll Pressure Mechanism ............................................M-88

14-4.Manual Feed Paper Separating Mechanism ...........................................M-89

14-5.Manual Feed Paper Empty Detection Mechanism ..................................M-90

14-6.Manual Feed Paper Width Detection Mechanism ................................... M-91

14-7.Manual Feed Paper Length Detection Mechanism .................................M-92

15. SYNCHRONIZING ROLLERS SECTION ........................................................M-93

15-1.Synchronizing Roller Drive Mechanism ................................................... M-93

15-2.Synchronizing Roller Drive Control ..........................................................M-94

16. TRANSFER DRUM SECTION .........................................................................M-95

16-1.Transfer Drum Drive Mechanism ............................................................. M-96

16-2.Paper Attraction .......................................................................................M-97

(1) Static Charge Roller ........................................................................M-99

(2) Backup Blade 2 ...............................................................................M-100

(3) Static Charge Corona ......................................................................M-100

(4) Charge Neutralizing Cloth 1 ............................................................M-100

(5) Charge Neutralizing Cloth 2 ............................................................M-101

(6) Paper Attraction Detection (before image transfer) .........................M-101

(7) Control .............................................................................................M-102

16-3.Image Transfer Section ...........................................................................M-103

(1) Backup Blade 1 ...............................................................................M-104

(2) Image Transfer Corona ................................................................... M-105

(3) Charge Neutralizing Cloth 3 ............................................................M-105

(4) Paper Attraction Detection (after image transfer) ............................M-105

ii

(5) Image Transfer Control ....................................................................M-106

16-4.Paper Separation Section ........................................................................M-107

(1) Paper Separation Lifting Finger .......................................................M-108

(2) Paper Separator Corona .................................................................M-108

(3) Paper Separator Finger ...................................................................M-108

(4) Paper Separating Failure Detection Mechanism .............................M-109

(5) Paper Holding Mechanism ..............................................................M-109

(6) Paper Separation Control ................................................................M-110

16-5.Transfer Film Cleaning mechanism .........................................................M-111

16-6.Oil Cleaning .............................................................................................M-113

(1) Oil Cleaning Backup Brush ..............................................................M-114

(2) Oil Roller ..........................................................................................M-114

(3) Oil Cleaning Control ........................................................................M-115

16-7.Toner Cleaning ........................................................................................M-116

(1) Toner Cleaning Backup Brush .........................................................M-117

(2) Fur Brush Unit .................................................................................M-117

(3) Fur Brush Roller/Toner Collecting Roller .........................................M-118

(4) Fur Brush Control ............................................................................M-119

16-8.Charge Neutralizing .................................................................................M-120

16-9.Transfer Drum Retraction Mechanism .....................................................M-121

17. PC DRUM CLEANING SECTION ....................................................................M-122

17-1.Pre-Cleaning Charge Corona ..................................................................M-122

17-2.PC Drum Cleaning ...................................................................................M-123

17-3.Ozone Exhaust from Pre-Cleaning Charge Corona and Transfer Drum .M-125

18. MAIN ERASE SECTION ..................................................................................M-126

19. FUSING UNIT SECTION .................................................................................M-127

19-1.Fusing Unit Drive Mechanism ..................................................................M-128

(1) Upper Fusing Roller .........................................................................M-128

(2) Lower Fusing Roller .........................................................................M-128

(3) Fusing Rollers Drive Mechanism .....................................................M-129

(4) Fusing Rollers Drive Control ............................................................M-130

(5) Fusing Speed Switching Control .....................................................M-131

(6) Fusing Motor Small-Amount Rotation Control .................................M-131

19-2.Fusing Roller Pressure Mechanism .........................................................M-132

19-3.Fusing Temperature Control ....................................................................M-133

19-4.Fusing Oil Application/Collection Mechanism .......................................... M-136

20. EXIT UNIT SECTION ......................................................................................M-138

21. HORIZONTAL TRANSPORT UNIT SECTION ................................................M-139

22. 2-Sided Copy Control with Several Sheets of Paper Resident along Paper

Path .................................................................................................................M-141

23. POWER SUPPLY ............................................................................................M-142

23-1.Power Lines When the Power Cord is Plugged in ...................................M-142

23-2.Power Lines When the Power Switch is Turned ON ...............................M-144

23-3.Power Supply Boards ON/OFF Control ...................................................M-146

23-4.CPU Reset Function ................................................................................M-146

23-5.Power Supply Cooling Mechanism ..........................................................M-147

24. MEMORY BACKUP .........................................................................................M-147

iii

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1. CROSS-SECTIONAL VIEW AND PAPER PATH

• The illustration below shows where different parts of the copier are placed and how the
copy paper moves through the copier.

• Each of the mechanical and electrical parts is identified and located in the relevant sec­tion that appears later in this manual.

Fusing Unit

IR

Sorter

Upper PH

Assy

Transfer

Unit

Duplex

Unit

PC Unit

Lower PH

Assy

Developing

Unit

Upper

Drawer

M-1

Middle

Drawer

Lower

Drawer

1179M014AA

2. COPY PROCESS

20. Paper Exit 19. Fusing

13. Paper

Separation

14. Oil Cleaning

15. Toner Cleaning

16. Charge

Neutralizing

10. Manual
Feed

Transfer Drum

9. Paper
Feeding

11. Attraction

3. Photoelectric
Conversion

5. PH Image
Processing

17. Cleaning

12. Image

Transfer

8. Pre-Image

Transfer Corona
Charging

6. Laser

Exposure

1. PC Drum

4. IR Image

Processing

18. Main Erase

2. PC Drum
Charging

7. Developing

Upper Drawer

Middle Drawer

Lower Drawer

M-2

1179M038CA

1. PC Drum

• An electrostatic latent image is formed on the surface of a photoconductive material that
coats an aluminum cylinder.

• An OPC type photoconductor is used.

2. PC Drum Charging

• A single-wire PC Drum Charge Corona employing the Scorotron system deposits a neg­ative DC charge across the entire surface of the PC Drum.

3. Photoelectric Conversion

• The light from Exposure Lamp is directed onto the original and reflected to strike the
CCD Sensor through mirrors and lens, thereby forming a reduced image of the original.

• The CCD Sensor separates the light striking it into different colors using its color filters
(R, G, and B), then converts it into a corresponding electrical signal and outputs the sig­nal to the IR Image Processing Unit.

4. IR Image Processing

• The electrical signal output from the Photoelectric Converter is converted to 8-bit digital
image signals (R, G, and B). After making some corrections, the IR Image Processing
Unit outputs video signals (C, M, Y, and Bk) to the PH Image Processing Unit.

5. PH Image Processing

• The video signals (C, M, Y, and Bk) output from the IR Image Processing Unit go through
some corrections. Following digital-to-analog conversion, these signals are then used for
the control of the intensity level of the laser diode.

6. Laser Exposure

• The laser beam emitted by the laser diode strikes the surface of the PC Drum to form an
electrostatic latent image.

7. Developing

• The toner, agitated and negatively charged in the developing unit of each color, is
attracted onto the electrostatic latent image formed on the surface of the PC Drum,
changing it to a visible, developed image.

• AC and DC negative bias voltages are applied to the Sleeve/Magnet Roller to ensure
toner transfer to the PC Drum.

8. Pre-Image Transfer Corona Charging

• A Scorotron system is used to even out the charge of toner, thereby stabilizing image
transfer.

9. Paper Feeding

• Paper is fed from each drawer.

10. Manual Paper Feeding

• The paper loaded in the Multi Bypass Table is fed.

M-3

11. Attraction

• The Static Charge Corona applies a positive DC corona emission to the Transfer Film,
while the Static Charge Roller presses the paper against the surface of the Transfer Film
so that the paper is attracted to the film by static charge.

12. Image Transfer

• The Image Transfer Corona applies a DC positive corona emission to the Transfer Film to
attract the negatively charged toner on the surface of the PC Drum onto the surface of
the paper.

13. Paper Separation

• The Paper Separator Corona applies an AC corona emission to the paper to weaken the
attraction of the paper to the Transfer Film.

• The Lifting Finger pushes up the Transfer Film, while the Paper Separator Finger pushes
down the Transfer Film so that the paper can be effectively separated from the surface of
the Transfer Drum.

14. Oil Cleaning

• The Oil Roller collects fusing oil from the surface of the Transfer Film during 2-sided
copying.

15. Toner Cleaning

• The Fur Brush Unit collects toner particles sticking to the surface of the Transfer Film.

16. Charge Neutralizing

• The Charge Neutralizing Corona showers both sides of the Transfer Film with AC and DC
overlapped corona charges so that the film is neutralized.

17. Cleaning

• The Pre-Cleaning Corona applies either a DC negative or AC corona emission to the sur­face of the PC Drum to neutralize it.

• The residual toner left on the surface of the PC Drum is scraped off by the Cleaning
Blade and is then conveyed by the Toner Conveying Coil to the Toner Collecting Box.

18. Main Erase

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

19. Fusing

• The Upper and Lower Fusing Rollers apply heat and pressure to the paper so that the
four different color layers of toner lying on the surface of the paper are mixed and fused
together, as well as being fixed collectively to the paper.

• Fusing oil is applied to the Fusing Rollers to secure the release of the paper and to help
toner be cleaned from the surfaces of the two fusing rollers.

• The Oil Collecting Blade scrapes residual oil from the Lower Fusing Roller. The recov­ered oil is then filtered for recycling.

20. Exit

• The Paper Exit Roller is turned to feed the paper out of the copier.

M-4