Konica 7145 Service Manual Safety

Minolta-7145-Service-Manual-790210 minolta-7145-service-manual-790210

7235 - Service Manual 7145-7222-7228-7235_SM Free User Guide for Konica Minolta Camera, Manual - page1

2015-08-19

: Konica Konica-7145-Service-Manual-788160 konica-7145-service-manual-788160 konica pdf

Open the PDF directly: View PDF .
Page Count: 448 [warning: Documents this large are best viewed by clicking the View PDF Link!]

7145/7222/7228/7235 SERVICE MANUAL
- GENERAL SECTION
- SERVICE SECTION

SERVICE MANUAL

Models

7145/7222/7228/7235

APRIL 2004

CSM-7145/7222/7228/7235

KONICA MINOLTA BUSINESS SOLUTIONS U.S.A., INC.

7145/7222/7228/7235

SERVICE MANUAL

APRIL 2004

IMPORTANT NOTICE

Because of the possible hazards to an inexperienced

person servicing this equipment, as well as the risk of

damage to the equipment, Konica Minolta Business

Solutions U.S.A., Inc. strongly recommends that all

servicing be performed by Konica Minolta-trained serv-

ice technicians only.

Changes may have been made to this equipment to

improve its performance after this service manual was

printed. Accordingly, Konica Minolta Business Solutions

U.S.A., Inc., makes no representations or warranties,

either expressed or implied, that the information con-

tained in this service manual is complete or accurate. It

is understood that the user of this manual must assume

all risks or personal injury and/or damage to the equip-

ment while servicing the equipment for which this serv-

ice manual is intended.

Printed in U.S.A.

Corporate Publications Department

CONTENTS

I OUTLINEII UNIT EXPLANATIONIII DIS./ASSEMBLY

CONTENTS

SAFETY AND IMPORTANT WARNING ITEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

IMPORTANT NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

DESCRIPTION ITEMS FOR DANGER, WARNING AND CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1

SAFETY WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-2

SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10

IMPORTANT INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10

SAFETY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11

INDICATION OF WARNING ON THE MACHINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-13

List of major differences between the 7145, 7235, 7228 and 7222 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

List of options corresponding to the 7145/7235/7228/7222 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

I OUTLINE

1. OUTLINE OF SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

2. PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

A. Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

B. Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

C. Copy paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

D. Machine data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

E. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

F. Consumables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

G. Operating environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3. CENTER CROSS SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4. DRIVE SYSTEM DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4.1 Drum drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4.2 Cleaning/Developer agitation drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4.3 Fixing/Paper exit section/IT-101/RU-101 drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

4.4 Developing drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

4.5 Paper feed drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

4.5.1 Drive from paper feed motor to loop clutch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

4.5.2 Tray 1 drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

4.5.3 Tray 2 drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

4.5.4 Bypass feed drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

4.5.5 Registration clutch drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

4.6 ADU drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

4.7 Scanner drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

4.8 Toner supply drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

CONTENTS

I OUTLINEII UNIT EXPLANATIONIII DIS./ASSEMBLY

II UNIT EXPLANATION

1. SCANNER SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

1.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

1.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

1.2.1 Initial operation when power is turned on and shading correction reading. . . . . . . . . . . . . . 2-2

1.2.2 Original reading mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

1.2.3 Original read control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

1.2.4 APS control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

1.2.5 AE control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

1.2.6 Image processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

2. WRITE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

2.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

2.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2.2.1 Image writing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2.2.2 Write control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

3. DRUM UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

3.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

3.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

3.2.1 Image formation timing (when copying two sheets) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

4. DEVELOPING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

4.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

4.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

4.2.1 Developing control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

4.2.2 Control of toner density in the developing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

5. TONER SUPPLY/CLEANING/RECYCLE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

5.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

5.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

5.2.1 Toner supply control when the toner level in the toner supply section gets reduced . . . . . 2-18

5.2.2 Toner supply control when toner density in the developing unit gets reduced . . . . . . . . . . 2-19

6. PAPER FEED UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

6.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

6.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

6.2.1 Tray up drive control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

6.2.2 Paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

6.2.3 Remaining paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

6.2.4 Paper size detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23

7. FIXING UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

7.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

7.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

7.2.1 Fixing temperature control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

7.2.2 Cleaning web control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

8. ADU/PAPER EXIT SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

8.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

8.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

8.2.1 Switching control of the paper exit/ADU conveyance path. . . . . . . . . . . . . . . . . . . . . . . . . 2-29

8.2.2 ADU conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31

8.2.3 Paper reverse control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

CONTENTS

iii

I OUTLINEII UNIT EXPLANATIONIII DIS./ASSEMBLY

9. INTERFACE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

9.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

10.NETWORK SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36

10.1 Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36

11.OTHER CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37

11.1 Parts energized when the main power switch is off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37

11.2 Components operated when the power switch is on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38

11.2.1 Components operated when the SW1 (Main power switch) is on . . . . . . . . . . . . . . . . . . . 2-38

11.2.2 Components operated when the SW2 (Sub power switch) is on . . . . . . . . . . . . . . . . . . . . 2-39

11.3 Fan control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40

11.3.1 Composition of the cooling fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40

11.3.2 Fan operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41

11.4 Operation unit control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42

11.4.1 Composition of operation unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42

11.5 Counter control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43

11.5.1 Counter composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43

11.5.2 Counter operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43

III DISASSEMBLY/ASSEMBLY

1. EXTERNAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

1.1 Replacing the ozone filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

1.2 Replacing the filter cover assembly and suction filter/A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

2. DRIVE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

2.1 Removing and reinstalling the motor units (main, fixing, feed, developing) . . . . . . . . . . . . . . . . . 3-3

2.2 Replacing the registration clutch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

2.3 Replacing the loop clutch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

2.4 Removing the ribbon cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

2.5 Reinstalling the ribbon cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

3. SCANNER SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

3.1 Screws that must not be removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

3.2 Adjusting the angle of the operation unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

3.3 Removing the operating unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

3.4 Removing the platen glass/slit glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

3.5 Removing and reinstalling the CCD unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

3.6 Replacing the exposure lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

3.7 Removing and reinstalling the exposure unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

3.8 Removing the optics wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

3.9 Installing the optics wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

4. WRITE UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

4.1 Removing and reinstalling the write unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

5. DRUM UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27

5.1 Removing and reinstalling the drum unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27

5.2 Removing and reinstalling the charging corona unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28

5.3 Removing and reinstalling the charge control plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28

5.4 Replacing the charging wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29

5.5 Removing and reinstalling the drum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29

5.6 Removing and reinstalling the separation claw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33

CONTENTS

I OUTLINEII UNIT EXPLANATIONIII DIS./ASSEMBLY

5.7 Removing and reinstalling the transfer and separation corona unit. . . . . . . . . . . . . . . . . . . . . . . 3-34

5.8 Replacing the transfer and separation wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34

6. DEVELOPING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

6.1 Screws that must not be removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

6.2 Removing and reinstalling the developing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

6.3 Replacing the developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

7. TONER SUPPLY/CLEANING/RECYCLE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

7.1 Removing and reinstalling the toner bottle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

7.2 Removing and reinstalling the toner supply unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

7.3 Removing and reinstalling the cleaning blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40

8. PAPER FEED UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42

8.1 Replacing the paper feed roller and the feed roller (by-pass) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42

8.2 Replacing the double feed prevention roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44

8.3 Replacing the paper feed rubber and the feed rubber (tray 1). . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45

8.4 Replacing the double feed prevention rubber (tray 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-47

8.5 Replacing the paper feed rubber and the feed rubber (tray 2). . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48

8.6 Replacing the double feed prevention rubber (tray 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50

8.7 Cleaning the paper dust removing brush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51

9. FIXING UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52

9.1 Removing and reinstalling the fixing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52

9.2 Replacing the fixing heater lamps/1, /2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53

9.3 Removing and reinstalling the fixing claw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55

9.4 Replacing the fixing web . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56

9.5 Removing and reinstalling the fixing heat roller, fixing pressure roller,

heat insulating sleeve/A, /B, fixing idling gear/B, fixing bearing/U, /L,

fixing heater lamp/1, /2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-59

9.6 Removing and reinstalling the fixing temperature sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-64

9.7 Removing and reinstalling the Fuse mounting plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 3-66

SAFETY AND IMPORTANT WARNING ITEMS

S-1

Read carefully the Safety and Important Warning Items described below to understand them before doing ser-

vice work.

Because of possible hazards to an inexperienced person servicing this copier as well as the risk of damage to

the copier, Konica Minolta Business Technologies, INC. (hereafter called the KMBT) strongly recommends that

all servicing be performed only by KMBT-trained service technicians.

Changes may have been made to this copier to improve its performance after this Service Manual was printed.

Accordingly, KMBT does not warrant, either explicitly or implicitly, that the information contained in this Service

Manual is complete and accurate.

The user of this Service Manual must assume all risks of personal injury and/or damage to the copier while ser-

vicing the copier for which this Service Manual is intended.

Therefore, this Service Manual must be carefully read before doing service work both in the course of technical

training and even after that, for performing maintenance and control of the copier properly.

Keep this Service Manual also for future service.

In this Service Manual, each of three expressions “ DANGER”, “ WARNING”, and “ CAUTION” is defined

as follows together with a symbol mark to be used in a limited meaning.

When servicing the copier, the relevant works (disassembling, reassembling, adjustment, repair, maintenance,

etc.) need to be conducted with utmost care.

Symbols used for safety and important warning items are defined as follows:

SAFETY AND IMPORTANT WARNING ITEMS

IMPORTANT NOTICE

DESCRIPTION ITEMS FOR DANGER, WARNING AND

CAUTION

DANGER :Action having a high possibility of suffering death or serious injury

WARNING:Action having a possibility of suffering death or serious injury

CAUTION :Action having a possibility of suffering a slight wound, medium trouble, and

property damage

:Precaution when using the copier. General precaution Electric hazard High temperature

:Prohibition when using the copier. General prohibition Do not touch with wet hand Do not disassemble

:Direction when using the copier. General instruction Unplug Ground/Earth

SAFETY AND IMPORTANT WARNING ITEMS

S-2

[1] MODIFICATIONS NOT AUTHORIZED BY

KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.

Konica Minolta brand copiers are renowned for their high reliability. This reliability is achieved through high-qual-

ity design and a solid service network.

Copier design is a highly complicated and delicate process where numerous mechanical, physical, and electrical

aspects have to be taken into consideration, with the aim of arriving at proper tolerances and safety factors. For

this reason, unauthorized modifications involve a high risk of degradation in performance and safety. Such mod-

ifications are therefore strictly prohibited. the points listed below are not exhaustive, but they illustrate the rea-

soning behind this policy.

SAFETY WARNINGS

DANGER : PROHIBITED ACTIONS

• Using any cables or power cord not specified by KMBT.

• Using any fuse or thermostat not specified by KMBT. Safety will not be

assured, leading to a risk of fire and injury.

• Disabling fuse functions or bridging fuse terminals with wire, metal clips, sol-

der or similar object.

• Disabling relay functions (such as wedging paper between relay contacts)

• Disabling safety functions (interlocks, safety circuits, etc.) Safety will not be

assured, leading to a risk of fire and injury.

• Making any modification to the copier unless instructed by KMBT

• Using parts not specified by KMBT

SAFETY AND IMPORTANT WARNING ITEMS

S-3

[2] CHECKPOINTS WHEN PERFORMING ON-SITE SERVICE

Konica Minolta brand copiers are extensively tested before shipping, to ensure that all applicable safety stan-

dards are met, in order to protect the customer and customer engineer (hereafter called the CE) from the risk of

injury. However, in daily use, any electrical equipment may be subject to parts wear and eventual failure. In order

to maintain safety and reliability, the CE must perform regular safety checks.

1.Power Supply

WARNING: Wall Outlet

• Check that mains voltage is as specified. Plug the power cord into the dedi-

cated wall outlet with a capacity greater than the maximum power consump-

tion.

If excessive current flows in the wall outlet, fire may result.

• If two or more power cords can be plugged into the wall outlet, the total load

must not exceed the rating of the wall outlet.

If excessive current flows in the wall outlet, fire may result.

WARNING: Power Plug and Cord

• Make sure the power cord is plugged in the wall outlet securely.

Contact problems may lead to increased resistance, overheating, and the

risk of fire.

• Check whether the power cord is damaged. Check whether the sheath is

damaged.

If the power plug, cord, or sheath is damaged, replace with a new power

cord (with plugs on both ends) specified by KMBT. Using the damaged

power cord may result in fire or electric shock.

• When using the power cord (inlet type) that came with this copier, be sure to

observe the following precautions:

a. Make sure the copier-side power plug is securely inserted in the socket

on the rear panel of the copier.

Secure the cord with a fixture properly.

b. If the power cord or sheath is damaged, replace with a new power cord

(with plugs on both ends) specified by KMBT.

If the power cord (inlet type) is not connected to the copier securely, a

contact problem may lead to increased resistance, overheating, and risk

of fire.

• Check whether the power cord is not stepped on or pinched by a table and

so on.

Overheating may occur there, leading to a risk of fire.

SAFETY AND IMPORTANT WARNING ITEMS

S-4

• Do not bundle or tie the power cord.

Overheating may occur there, leading to a risk of fire.

• Check whether dust is collected around the power plug and wall outlet.

Using the power plug and wall outlet without removing dust may result in

fire.

• Do not insert the power plug into the wall outlet with a wet hand.

The risk of electric shock exists.

• When unplugging the power cord, grasp the plug, not the cable.

The cable may be broken, leading to a risk of fire and electric shock.

WARNING: Wiring

• Never use multi-plug adapters to plug multiple power cords in the same out-

let.

If used, the risk of fire exists.

• When an extension cord is required, use a specified one.

Current that can flow in the extension cord is limited, so using a too long

extension cord may result in fire.

Do not use an extension cable reel with the cable taken up. Fire may

result.

WARNING: Ground Lead

• Check whether the copier is grounded properly.

If current leakage occurs in an ungrounded copier, you may suffer electric

shock while operating the copier. Connect the ground lead to one of the

following points:

a. Ground terminal of wall outlet

b. Ground terminal for which Class D work has been done

WARNING: Power Plug and Cord

SAFETY AND IMPORTANT WARNING ITEMS

S-5

2.Installation Requirements

• Pay attention to the point to which the ground lead is connected.

Connecting the ground lead to an improper point such as the points listed

below results in a risk of explosion and electric shock:

a. Gas pipe (A risk of explosion or fire exists.)

b. Lightning rod (A risk of electric shock or fire exists.)

c. Telephone line ground (A risk of electric shock or fire exists in the case

of lightning.)

d. Water pipe or faucet (It may include a plastic portion.)

WARNING: Prohibited Installation Place

• Do not place the copier near flammable materials such as curtains or volatile

materials that may catch fire.

A risk of fire exists.

• Do not place the copier in a place exposed to water such as rain water.

A risk of fire and electric shock exists.

WARNING: Nonoperational Handling

• When the copier is not used over an extended period of time (holidays, etc.),

switch it off and unplug the power cord.

Dust collected around the power plug and outlet may cause fire.

CAUTION: Temperature and Humidity

• Do not place the copier in a place exposed to direct sunlight or near a heat

source such as a heater.

A risk of degradation in copier performance or deformation exists.

Do not place the copier in a place exposed to cool wind.

Recommended temperature and humidity are as follows:

Temperature: 10°C to 30°C

Humidity: 10% to 80% (no dew condensation)

Avoid other environments as much as possible.

CAUTION: Ventilation

• Do not place the copier in a place where there is much dust, cigarette

smoke, or ammonia gas.

Place the copier in a well ventilated place to prevent machine problems

and image faults.

WARNING: Ground Lead

SAFETY AND IMPORTANT WARNING ITEMS

S-6

• The copier generates ozone gas during operation, but it is not sufficient to be

harmful to the human body.

If a bad smell of ozone is present in the following cases, ventilate the

room.

a. When the copier is used in a poorly ventilated room

b. When taking a lot of copies

c. When using multiple copiers at the same time

CAUTION: Vibration

• When installing the copier, read the Installation Guide thoroughly. Be sure to

install the copier in a level and sturdy place.

Constant vibration will cause problems.

• Be sure to lock the caster stoppers.

In the case of an earthquake and so on, the copier may slide, leading to a

injury.

CAUTION: Inspection before Servicing

• Before conducting an inspection, read all relevant documentation (service

manual, technical notices, etc.) and proceed with the inspection following the

prescribed procedure in safety clothes, using only the prescribed tools. Do

not make any adjustment not described in the documentation.

If the prescribed procedure or tool is not used, the copier may break and a

risk of injury or fire exists.

• Before conducting an inspection, be sure to disconnect the power plugs from

the copier and options.

When the power plug is inserted in the wall outlet, some units are still pow-

ered even if the POWER switch is turned OFF. A risk of electric shock

exists.

• The area around the fixing unit is hot.

You may get burnt.

DANGER: Work Performed with the Copier Powered

• Take every care when making adjustments or performing an operation check

with the copier powered.

If you make adjustments or perform an operation check with the external

cover detached, you may touch live or high-voltage parts or you may be

caught in moving gears or the timing belt, leading to a risk of injury.

CAUTION: Ventilation

SAFETY AND IMPORTANT WARNING ITEMS

S-7

• Take every care when servicing with the external cover detached.

High-voltage exists around the drum unit. A risk of electric shock exists.

WARNING: Safety Checkpoints

• Check the exterior and frame for edges, burrs, and other damages.

The user or CE may be injured.

• Do not allow any metal parts such as clips, staples, and screws to fall into the

copier.

They can short internal circuits and cause electric shock or fire.

• Check wiring for squeezing and any other damage.

Current can leak, leading to a risk of electric shock or fire.

• When disconnecting connectors, grasp the connector, not the cable.

(Specifically, connectors of the AC line and high-voltage parts)

Current can leak, leading to a risk of electric shock or fire.

• Carefully remove all toner remnants and dust from electrical parts and elec-

trode units such as a charging corona unit.

Current can leak, leading to a risk of copier trouble or fire.

• Check high-voltage cables and sheaths for any damage.

Current can leak, leading to a risk of electric shock or fire.

• Check electrode units such as a charging corona unit for deterioration and

sign of leakage.

Current can leak, leading to a risk of trouble or fire.

• Before disassembling or adjusting the write unit incorporating a laser, make

sure that the power cord has been disconnected.

The laser light can enter your eye, leading to a risk of loss of eyesight.

• Do not remove the cover of the write unit. Do not supply power with the write

unit shifted from the specified mounting position.

The laser light can enter your eye, leading to a risk of loss of eyesight.

• When replacing a lithium battery, replace it with a new lithium battery speci-

fied in the Parts Guide Manual. Dispose of the used lithium battery using the

method specified by local authority.

Improper replacement can cause explosion.

DANGER: Work Performed with the Copier Powered

SAFETY AND IMPORTANT WARNING ITEMS

S-8

WARNING: Safety Checkpoints

• After replacing a part to which AC voltage is applied (e.g., optical lamp and

fixing lamp), be sure to check the installation state.

A risk of fire exists.

• Check the interlock switch and actuator for loosening and check whether the

interlock functions properly.

If the interlock does not function, you may receive an electric shock or be

injured when you insert your hand in the copier (e.g., for clearing paper

jam).

• Make sure the wiring cannot come into contact with sharp edges, burrs, or

other pointed parts.

Current can leak, leading to a risk of electric shock or fire.

• Make sure that all screws, components, wiring, connectors, etc. that were

removed for safety check and maintenance have been reinstalled in the orig-

inal location. (Pay special attention to forgotten connectors, pinched cables,

forgotten screws, etc.)

A risk of copier trouble, electric shock, and fire exists.

DANGER: HANDLING OF SERVICE MATERIALS

• Toner and developer are not harmful substances, but care must be taken not

to breathe excessive amounts or let the substances come into contact with

eyes, etc. It may be stimulative.

If the substances get in the eye, rinse with plenty of water immediately.

When symptoms are noticeable, consult a physician.

• Never throw the used cartridge and toner into fire.

You may be burned due to dust explosion.

SAFETY AND IMPORTANT WARNING ITEMS

S-9

[3] MEASURES TO TAKE IN CASE OF AN ACCIDENT

1. If an accident has occurred, the distributor who has been notified first must immediately take emergency

measures to provide relief to affected persons and to prevent further damage.

2. If a report of a serious accident has been received from a customer, an on-site evaluation must be carried

out quickly and KMBT must be notified.

3. To determine the cause of the accident, conditions and materials must be recorded through direct on-site

checks, in accordance with instructions issued by KMBT.

4. For reports and measures concerning serious accidents, follow the regulations given in “Serious Accident

Report/Follow-up Procedures”.

[4] CONCLUSION

1. Safety of users and customer engineers depends highly on accurate maintenance and administration.

Therefore, safety can be maintained by the appropriate daily service work conducted by the customer

engineer.

2. When performing service, each copier on the site must be tested for safety. The customer engineer must

verify the safety of parts and ensure appropriate management of the equipment.

DANGER : HANDLING OF SERVICE MATERIALS

• Unplug the power cord from the wall outlet.

Drum cleaner (isopropyl alcohol) and roller cleaner (acetone-based) are

highly flammable and must be handled with care. A risk of fire exists.

• Do not replace the cover or turn the copier ON before any solvent remnants

on the cleaned parts have fully evaporated.

A risk of fire exists.

• Use only a small amount of cleaner at a time and take care not to spill any

liquid. If this happens, immediately wipe it off.

A risk of fire exists.

• When using any solvent, ventilate the room well.

Breathing large quantities of organic solvents can lead to discomfort.

SAFETY AND IMPORTANT WARNING ITEMS

S-10

The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration implemented

regulations for laser products manufactured since August 1, 1976. Compliance is mandatory for products mar-

keted in the United States.

This copier is certified as a “Class 1” laser product under the U.S.

Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation

Control for Health and Safety Act of 1968. Since radiation emitted inside this copier is completely confined within

protective housings and external covers, the laser beam cannot escape during any phase of normal user opera-

tion.

SAFETY INFORMATION

IMPORTANT INFORMATION

SAFETY AND IMPORTANT WARNING ITEMS

S-11

This machine is provided with the following safety circuits

to prevent machine faults from resulting in serious acci-

dents.

[1] Overall protection circuit

[2] L2 and L3 (fixing heater lamp/1, /2) overheat-

ing prevention circuit

These safety circuits are described below to provide

the service engineer with a renewed awareness of

them in order to prevent servicing errors that may

impair their functions.

[1] Overall protection circuit

1. Protection by CBR1 and CBR2 (circuit

breaker/1, /2)

CBR1 and CBR2 interrupt the AC line instanta-

neously when an excessive current flows due

to a short in the AC line.

CAUTION:

The CBR1 and CBR2 functions must not

be deactivated under any circumstances.

[2] L2 and L3 (fixing heater lamp/1, /2)

overheating prevention circuit

1. Protection by software

The output voltage from TH1, TH2 (fixing tem-

perature sensor/1, /2) is read by the CPU. If

this voltage is abnormal, L2 (fixing heater

lamp/1), L3 (fixing heater lamp/2) and RL1

(main relay) are turned OFF.

CAUTION:

The RL1 function must not be deactivated

under any circumstances.

SAFETY CIRCUITS

DCPS

CBR1

CBR2

DCPS

AC driver

section

RL1

FCB

Control

section

TH1 TH2

RL1 TS

SAFETY AND IMPORTANT WARNING ITEMS

S-12

2. Protection by the hardware circuit

The output voltages from TH1, TH2 (fixing tem-

perature sensor/1, /2) are compared with the

abnormality judgment reference value in the

comparator circuit. If the output voltage from

TH1 or TH2 exceeds the reference value, L2

(fixing heater lamp/1), L3 (fixing heater lamp/2)

and RL1 (main relay) are turned OFF in hard-

ware means.

CAUTION:

Periodically check the TH1, TH2 face

contacting the roller, and replace TH2 if

any abnormality is detected.

The RL1 function must not be deactivated

under any circumstances.

3. Protection by TS (thermostat)

When the fixing heat roller exceeds the speci-

fied value, TSs (thermostats) are turned OFF,

thus interrupting the power to L2 (fixing heater

lamp/1), and L3 (fixing heater lamp/2) directly.

CAUTION:

Do not use any other electrical conductor

in place of TS1 and TS2.

SAFETY AND IMPORTANT WARNING ITEMS

S-13 2

Caution labels shown below are attached in some areas on/in the machine.

When accessing these areas for maintenance, repair, or adjustment, special care should be taken to avoid burns

and electric shock.

[1] Main body

1. Right side

<7145>

CAUTION

INDICATION OF WARNING ON THE MACHINE

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-

self away from.

Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot

be read, contact our Service Office.

7322sf001e

CAUTION

The fixing unit is very hot.

To avoid getting burned

DO NOT TOUCH.

CAUTION

This area generates

high voltage.

If touched, electrical

shock may occur.

DO NOT TOUCH! CAUTION

The roller shaft on the inside

of the cover is very hot.

To avoid getting burned DO

NOT TOUCH.

If the cover comes off, return

it to its original position.

(Inside of the main

body right side door)

(Inside of the main

body front door)

SAFETY AND IMPORTANT WARNING ITEMS

S-14

<7235/7228/7222>

CAUTION

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-

self away from.

Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot

be read, contact our Service Office.

7322sf002e

SAFETY AND IMPORTANT WARNING ITEMS

S-15 2

2. Front side

<7145>

CAUTION

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-

self away from.

Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot

be read, contact our Service Office.

7322sf003e

SAFETY AND IMPORTANT WARNING ITEMS

S-16

<7235/7228/7222>

CAUTION

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-

self away from.

Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot

be read, contact our Service Office.

7322sf004e

SAFETY AND IMPORTANT WARNING ITEMS

S-17 2

3. Rear/Left side (7235/7228/7222 only)

CAUTION

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-

self away from.

Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot

be read, contact our Service Office.

7322sf005e

SAFETY AND IMPORTANT WARNING ITEMS

S-18

4. Scanner section

<7145>

CAUTION

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-

self away from.

Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot

be read, contact our Service Office.

7322sf006

SAFETY AND IMPORTANT WARNING ITEMS

S-19 2

<7235/7228/7222>

CAUTION

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-

self away from.

Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot

be read, contact our Service Office.

7322sf007e

SAFETY AND IMPORTANT WARNING ITEMS

S-20

[2] FS-113

[3] FS-114

CAUTION

You may be burned or injured if you touch any area that you are advised by any caution label to keep your-

self away from.

Do not remove caution labels. If any caution label has come off or soiled and therefore the caution cannot

be read, contact our Service Office.

7322sf009

CAUTION

This area is very hot.

To avoid getting

burned DO NOT

TOUCH.

CAUTION

To avoid injury, DO NOT put your hand on the top

of the printed sheets. Be sure to hold both sides

of the printed sheets when removing them, and

DO NOT leave your hand on the printed sheets

while the primary (main) tray goes up.

(Inside of the Finisher)

FS-113 Finisher

7322sf010

FS-114 Finisher

List of major differences between the 7145, 7235, 7228 and 7222

Classification 7145 7235 7228 7222 Reason

Specifications

Warmup time Less than

30 sec. Less than 19 sec.

Change of

specifications

First copy out time

(8.5x11)

Less than

3.8 sec.

Less than

4.3 sec. Less than 4.9 sec.

Continuous copy

speed (8.5x11)

45 sheets/min. 35 sheets/min. 28 sheets/min.

22 sheets/min.

Maximum E-RDH

memory 320MB

DF Standard Optional

ADU Standard

Paper exit tray

Optional

Standard

Machine dimensions

(with DF and DB)

23.2in (W)

23.4in (D)

42.6in (H)

23.4in (W) x 25.8in (D) x 44.6in (H)

Maintenance

Once every

120,000 copies

Once every 100,000 copies

Materials

Developer Exclusively

for 7145 Exclusively for 7235/7228/7222

Toner Exclusively

for 7145

Exclusively for

7235 (Common

to 7135)

Exclusively for 7228/7222

(Common to 7022/7120/7135)

Drum Exclusively

for 7145 Exclusively for 7235/7228/7222

Drive section

Flywheel f 103mm f 132mm

Developing sleeve

drive

Developing

motor Main motor

Vibration insulator Not provided Provided Not provided

Scanner

section

Scanner drive board Provided Not provided

Write section

Laser 2 beams 1 beam

Number of rotations

of polygon motor 27,165rpm 38,976rpm 33,070rpm Change of

CPM

Polygon cooling Not provided Provided Not provided Change of

specifications

List of major differences between the 7145, 7235, 7228 and 7222

Fixing

section

Fixing unit Exclusively

for 7145 Exclusively for 7235/7228/7222

Change of

specifications

ADU/Paper

exit section

Decurler roller Provided Not provided

ADU drive board Not provided Provided

Electrical parts

Developing motor Provided Not provided

ADU motor Provided

Fixing cooling fan Provided Not provided

Internal cooling fan/2 Provided Not provided

Polygon cooling fan Not provided Provided Not provided

ADU gate solenoid Provided

ADU sensor Provided

Timing sensor/U Provided Not provided

Timing sensor/L Provided Not provided

Control

Overall control Exclusively

for 7145

Exclusively

for 7235

Exclusively

for 7228

Exclusively

for 7222

Image control

Classification 7145 7235 7228 7222 Reason

List of options corresponding to the 7145/7235/7228/7222

Optional 7145 7235 7228 7222

RADF DF-318 Standard Not corresponding

DF-320

Not corresponding

Corresponding

Finisher FS-112 Corresponding Not corresponding

FT-107

FS-113

Corresponding

RU-101

FS-114

BK-114

PK-114

SK-114

Paper exit tray ET-101 Corresponding Corresponding*1

Inner tray IT-101 Corresponding

Desk DK-110

Not corresponding

Corresponding

DB DB-211

CorrespondingDB-411

LCT LT-203

ADU AD-307 Standard

Post script PS-344 Corresponding Not corresponding

PS-346

Not corresponding

Corresponding

Printer

controller

IP-432 Corresponding Not corresponding

IP-424

Not corresponding

Corresponding

FAX controll

board

FK-102 Type-A

Corresponding Not corresponding

FK-103

Not corresponding

Corresponding

2 lines

expansion kit

FL-102 Corresponding Not corresponding

FL-103

Not corresponding

Corresponding

Hard disk HD-103 Type-A

Corresponding

Total counter Standard Corresponding

Key counter Corresponding

*1 A paper exit tray is provided as standard equipment that is different from ET-101. When ET-101 is pro-

vided, it is integrated into the main body as seen from the point of design.

List of options corresponding to the 7145/7235/7228/7222

Blank Page

OUTLINE OF SYSTEM

1-1

I OUTLINE

IOUTLINE

1. OUTLINE OF SYSTEM

[18][1]

[2]

[3]

[17]

[4]

[5]

[6] [7]

[8]

[13]

[9]

[12]

[16]

[11]

[10]

[14] [19][15]

7322ma1001

OUTLINE OF SYSTEM

1-2

I OUTLINE

*1 As a standard equipment, the 7235/7228/7222 are provided with a paper exit tray that is different from

the one with which the ET-101 is equipped.

[1] Main body [10]

RADF (DF-318: 7145 provided as a standard equipment)

(DF-320: 7235/7228/7222)[2] LCT (LT-203)

[3] LCT DB (DB-411) [11] Paper exit tray (ET-101)*1

[4] 2-Tray DB (DB-211) [12] Finisher (FS-114)

[5] Conveyance unit (RU-101) [13] Additional tray (BK-114)

[6] Finisher (FS-113) [14] Punch kit (PK-114)

[7] Inner tray (IT-101) [15] Crease unit (included in SK-114)

[8] Finisher tray (FT-107: FS-112) [16] Saddle unit (SK-114)

[9] Finisher (FS-112: 7145 only) [17] Desk (DK-110: 7235/7228/7222 only)

[18] ADU (provided as a standard equipment)

[19] Platen cover (CV-109: 7235/7228/7222 only)

[1] Postscript (PS-344: 7145)

(PS-346: 7235/7228/7222)

[6]

[7]

[8]

[9]

Hard disk (HD-103 Type-A)

Total counter

(7145 provided as standard equipment)

(In the case of the 7235/7228/7222, ship-

ments only to the United States are pro-

vided with the total counter.)

Key counter

Expansion memory for the printer controller

(Not displayed here. For details, see the

Service Manual of the controller.)

[2]

[3]

Printer controller (IP-432: 7145)

(IP-424: 7235/7228/7222)

2 line expansion kit (shipments only to the

United States and

Oceania)

(FL-102:FK-102 Type-A)

(FL-103:FK-103)

[4] Fax control board(FK-102 Type-A: 7145)

(FK-103: 7235/7228/7222)

[5]

E-RDH expansion memory (MU-404: 64MB/MU-405: 128MB)

[1]

[2]

[3]

[4]

[5][6]

[7]

[8]

7145ma1020

PRODUCT SPECIFICATIONS

1-3

I OUTLINE

2. PRODUCT SPECIFICATIONS

A. Type

Type: Semi-console type (7145)

Desk-top type (7235/7228/7222)

Copying method: Indirect electrostatic method

Original table: Fixed

Original alignment: Left rear standard

Photosensitive material: OPC

Sensitizing method: Laser writing

Paper feed trays: Two trays (500 sheets x 2, 80g/m2 or 20lbs)

Multisheet bypass tray (50 sheets, 80g/m2)

DB-211 (500 sheets x 2, 80g/m2 or 20lbs) *1

DB-411 (1500 sheets, 80g/m2 or 20lbs) *1

LT-203 (2000 sheets, 80g/m2 or 20lbs) *1

*1 Optional

B. Functions

Original: Sheet, book, solid object (Thickness: up to 1.2in. Weight: up to 15lbs)

Maximum original size: A3, or 11 x 17

Copy size (for metric area):

Tray 1: B4, A4, A4R, B5, B5R, A5R, 8.5 x 14, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5R, F4

Tray 2: A3, B4, A4, A4R, B5, B5R, A5R, 11 x 17, 8.5 x 11, 8.5 x 11R, F4

Bypass tray: A3, B4, A4, A4R, B5, B5R, A5R, B6R, 8.5 x 11R (7145 only),

8.5 x 11 (except the 7145), F4 (except the 7145)

ADU: A3, B4, A4, A4R, B5, B5R, A5R, 11 x 17, 8.5 x 11, 8.5 x 11R, 8.5 x 14, 5.5

x 8.5R, F4

Copy size (for inch area):

Tray 1: 8.5 x 14, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5R, F4, B4R (7145 only), A4, A4R,

B5, A5R

Tray 2: 11 x 17, 8.5 x 14, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5R, F4, A3, A4, A4R, A5R

Bypass tray: 11 x 17, 8.5 x 14, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5R, A4

ADU: 11 x 17, 8.5 x 14, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5R, A3, B4 (7145 only), A4,

A4R, B5, A5R, F4

Magnification:

Fixed magnification (for metric area):

x 1.00, x 1.41, x 1.22, x 1.15, x 0.86, x 0.82, x 0.71

Fixed magnification (for inch area):

x 1.00, x 2.00, x 1.55, x 1.29, x 0.77, x 0.65, x 0.50

Special ratio: Three kinds

Zoom magnification: x 0.25 to x 4.00 (at 1% step)

Vertical magnification: x 0.25 to x 4.00 (at 1% step)

Horizontal magnification: x 0.25 to x 4.00 (at 1% step)

PRODUCT SPECIFICATIONS

1-4

I OUTLINE

Warm-up time: Less than 30 sec. (7145)

(at temperature of 68°F, Less than 19 sec. (7235/7228/7222)

at rated voltage)

First copy out time: Less than 3.8 sec. (7145)

Less than 4.3 sec. (7235)

Less than 4.9 sec. (7228/7222)

* platen mode, manual density, life size, tray 1, paper exit with face down,

A4 or 8.5 x 11

Continuous copy speed: 45 copies/min. (7145)

(A4 or 8.5 x 11, 35 copies/min. (7235)

in memory copy) 28 copies/min. (7228)

22 copies/min. (7222)

Continuous copy count: Up to 999

No. of sheets loadable

on the paper exit tray: Up to 100 (8.5x11)

Copy density selection: AE, manual (9 steps), arbitrary density (2 modes)

Resolution:

Scan: 600 dpi x 600 dpi

Write: 600 dpi x 600 dpi

ERDH memory *1: Standard 64MB, Maximum 320MB

Interface section: Serial port (USB TypeB), Serial port (RS-232C), RJ45 Ethernet connector,

Parallel port (IEEE1284 (Compatible, Nible, ECP))

Network section: Ethernet frame type: IEEE 802.3/802.3/Ethernet II/

IEEE 802.3 SNAP

Connecting type: 10 Base-T/100 Base-TX

Corresponding protocol: TCP/IP (BOOTP, ARP, ICMP, DHCP,

SNMP, HTTP, SMTP, POP3, FTP, IPP),

IPX/SPX, AppleTalk (EtherTalk),

Corresponding OS: Novell NetWare (3.x, 4.x, 5.x), Microsoft

Windows 95/98/Me, Microsoft Windows

NT4.0/2000/XP, Mac OS8.x and later,

Mac OS10.2.5

Multi-protocol: Automatic discrimination

Corresponding printing method: Peer-to-Peer (TCP/IP), LPD/LPR (TCP/

IP), PServer (IPX/SPX), RPrinter (IPX,

SPX), AppleTalk (EtherTalk)

General purpose utility: Web browser (Internet Explorer,

Netscape Navigator)

Status indicator LED: Green LED and orange LED, one for

each

*1 Since the standard 64MB memory is packaged on the board, it is not possible to replace it with a new

one.

Only one slot is provided for expansion. It can be installed with MU-404 (64MB), MU-405 (128MB), or

256MB (commercially available).

For 256MB (commercially available), be sure to use those of make and model No. specified separately.

PRODUCT SPECIFICATIONS

1-5

I OUTLINE

Number of originals to be stored:More than 140 sheets under the following conditions:

Original: Konica standard chart

Density: Manual 5

Mode: Character/photograph

Memory capacity: 64MB (provided only as standard)

Job: Job in mode with page memory not used

C. Copy Paper

Plain paper: 60g/m2 or 17lbs to 105g/m2 or 28lbs, high-quality paper

Special paper *1 Label paper, OHP film, blueprint-master paper, 50g/m2 or 13lbs to 59g/m2

or 16lbs high-quality paper (thin), 106g/m2 or 28lbs to 130g/m2 or 35lbs

high-quality paper (thick1), 131g/m2 or 35lbs to 160g/m2 or 43lbs high-

quality paper (thick2 *2)

*1 With bypass feed method, paper should be fed one sheet at a time. Double sided copy not allowed.

*2 Only bypass feed.

D. Machine Data

Power source: 230VAC –14% to 10.6% 50Hz/60Hz

120VAC –14% to 6% 60Hz

Power consumption: Maximum 1500W or less (fully optional)

Weight: Approximately 183lbs (with DF provided)

Dimensions: 7145: 23.2in (W) x 23.4in (D) x 42.6in (H) (with DF + DB)

7235/7228/7222: 23.4in (W) x 25.8in (D) x 44.6in (H) (with DF + DB)

E. Maintenance

Maintenance: Once every 120,000 copies (7145)

Once every 100,000 copies (7235/7228/7222)

F. Consumables

Developer: Exclusively for 7145

Exclusively for 7235/7228/7222

Toner: Exclusively for 7145

Exclusively for 7235 (Common to 7135)

Exclusively for 7228/7222 (Common to 7022/7120/7130)

Drum: Exclusively for 7145 (φ 60)

Exclusively for 7235/7228/7222 (φ 60)

PRODUCT SPECIFICATIONS

1-6

I OUTLINE

G. Operating Environment

Temperature: 10°C to 30°C (50°F to 86°F)

Humidity: 10% RH to 80% RH

Note:

• The information herein may be subject to change for improvement without notice.

CENTER CROSS SECTION

1-7

I OUTLINE

3. CENTER CROSS SECTION

[1] Fixing unit [10] DB

[2] Drum unit [11] Developing unit

[3] Separation corona unit [12] Tray 2

[4] Transfer corona unit [13] Tray 1

[5] ADU unit [14] Charging corona unit

[6] Bypass tray [15] Cleaning/toner recycling unit

[7] Paper feed path for making a double-sided

copy (DB unprovided)

[16]

[17]

Toner bottle

Scanner unit

[8] Paper feed path for making a double-sided

copy (DB provided)

[18]

[19]

V-mirror unit

Exposure unit

[9] DB paper feed path [20] CCD unit

7322ma1002

[1]

[2]

[3]

[4]

[5]

[6]

[8]

[7]

[9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[18] [19] [20]

DRIVE SYSTEM DIAGRAM

1-8

I OUTLINE

4. DRIVE SYSTEM DIAGRAM

4.1 Drum Drive

4.2 Cleaning/Developer Agitation Drive

[1] M1 (Main motor) [2] Drum drive shaft

[1] M1 (Main motor) [3] Developer agitation drive

[2] Cleaning/toner recycling unit drive

[1]

[2]

[1]

[2]

[3]

DRIVE SYSTEM DIAGRAM

1-9

I OUTLINE

4.3 Fixing/Paper Exit Section/IT-101/RU-101 Drive

4.4 Developing Drive

In the case of the 7145

[1] IT-101 [4] Paper exit drive

[2] M11 (Fixing motor) [5] Drive coupling for IT-101 and RU-101

[3] Fixing unit drive

[1] Developing sleeve [3] M3 (Developing motor)

[2] Developing unit [4] Drum drive shaft

[1]

[2]

[3]

[4] [5]

[1]

[2]

[3]

[4]

DRIVE SYSTEM DIAGRAM

1-10

I OUTLINE

In the case of the 7235/7228/7222

4.5 Paper Feed Drive

4.5.1 Drive from paper feed motor to loop clutch

[1] M1 (Main motor) [3] Developing unit

[2] Developing sleeve [4] Drum drive shaft

[1] MC2 (Loop clutch) [2] M9 (Paper feed motor)

7322ma1003

[2]

[1]

[3]

[4]

[1]

[2]

DRIVE SYSTEM DIAGRAM

1-11

I OUTLINE

4.5.2 Tray 1 drive

4.5.3 Tray 2 drive

[1]

[2]

SD1 (1st paper feed solenoid/U)

Conveyance roller

[4] Driven when SD1

(1st paper feed solenoid/U) is on.

[3] MC2 (Loop clutch) [5] Feed roller

[1]

[2]

MC2 (Loop clutch)

Feed roller

[4] Driven when SD2

(1st paper feed solenoid/L) is on.

[3] SD2 (1st paper feed solenoid/L) [5] Conveyance roller

[1]

[2]

[3]

[5][4]

[1]

[3]

[2]

[4]

[5]

DRIVE SYSTEM DIAGRAM

1-12

I OUTLINE

4.5.4 Bypass feed drive

4.5.5 Registration clutch drive

[1] MC2 (Loop clutch) [3] SD3 (Bypass solenoid)

[2] Conveyance roller [4] Driven when SD3 (Bypass solenoid) is on.

[5] Paper feed roller

[1] M9 (Paper feed motor) [2] MC1 (Registration clutch)

[1]

[2]

[3]

[4] [5]

[1]

[2]

DRIVE SYSTEM DIAGRAM

1-13

I OUTLINE

4.6 ADU Drive

[1] M1 (Main motor) [5] ADU roller

[2] Timing belt [6] ADU conveyance roller/2

[3] M9 (Paper feed motor) [7] Decurler roller

[4] M6 (ADU motor) [8] ADU conveyance roller/1

[9] M11 (Fixing motor)

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

DRIVE SYSTEM DIAGRAM

1-14

I OUTLINE

4.7 Scanner Drive

[1] Optical wire/R [4] Exposure unit

[2] Optical wire/F [5] M2 (Scanner motor)

[3] V-mirror unit

[1]

[2]

[3] [4] [5]

DRIVE SYSTEM DIAGRAM

1-15

I OUTLINE

4.8 Toner Supply Drive

[1] Toner agitation plate [4] M4 (Toner supply motor 1)

[2] Toner conveyance screw [5] M10 (Toner supply motor 2)

[3] SD9 (Toner solenoid)

[1]

[2]

[4]

[3]

[5]

DRIVE SYSTEM DIAGRAM

1-16

I OUTLINE

Blank page

SCANNER SECTION

2-1

II UNIT EXPLANATION

1. SCANNER SECTION

1.1 Composition

Symbol Name Function or method

[1] INV1 (Exposure lamp inverter) L1 (Exposure lamp) turn on

[2] PS17 (APS sensor) Detection of original size in the direction of sub-scanning

[3] ADB (A/D converter board) Digital conversion of analog signal

[4] CCD unit Photoelectric conversion of read image (600dpi)

[5] Exposure unit Image reading

Light source slit exposure

Scan speed

• Forward: 230mm/sec. (in 1:1 magnification)

• Backward: 383mm/sec.

[6] Optical wire Transmission of driving force from M2 to the exposure unit and

the V-mirror unit (front and rear)

[7] V-mirror unit Reflection of reading light (2nd and 3rd mirrors)

[8] PS14 (Scanner HP sensor) Exposure unit HP detection

[9] L1 (Exposure lamp) Light source for reading image,

Xenon lamp

[10] L1INVB (Power supply board

for exposure lamp)

Relay board for INV1 (Exposure lamp inverter) and L1 (Expo-

sure lamp)

[11] M2 (Scanner motor) Driving of the optical wire used to move the exposure unit and

the V-mirror unit

Three-phase step motor

[12] PS15 (APS timing sensor) RADF open/close detection

7322ma2001e

[2][3][4][5][6] [1]

[12][11][10][9][8][7]

SCDB

SCB

7235/7228/7222

7145

SCANNER SECTION

2-2

II UNIT EXPLANATION

1.2 Operation

1.2.1 Initial operation when power is turned on and shading correction reading

When the SW2 (Sub power switch) comes on, the exposure unit starts a home position search. At this

time, the exposure unit uses the white reference plate attached on the back side of the original pressing

board for shading correction. However, two places on the white reference plate are read for correction.

The search procedure differs depending on whether the PS14 (Scanner HP sensor) is on or off while the

SW2 is on.

A. Home position search when the PS14 is turned on

B. Home position search when PS14 is turned off

1.2.2 Original reading mode

The following two modes are available for original reading; platen mode and DF mode. In platen mode, the

exposure unit moves as necessary to scan the original for reading. In DF mode, the RADF side moves the

original while the exposure unit stays fixed in a specified position (DF reading position).

[1] Exposure unit standby position [3] Shading correction position 1

[2] PS14 [4] Shading correction position 2

[1] Exposure unit standby position [3] Shading correction position 1

[2] PS14 [4] Shading correction position 2

7322ma2015

[1][2][3][4]

7322ma2016

[1][2][3][4]

SCANNER SECTION

2-3

II UNIT EXPLANATION

A. Exposure unit movement in platen mode

In platen mode, the scan sequence depends on the copy density selection (either AE or manual).

(1) In manual density copy:

Note:

• When the tray 1 is selected manually, but not in APS, the shading operation is not executed.

(2) In AE copy:

B. Exposure unit movement in DF mode

[1]

[2]

Exposure unit standby position

PS14

[5] Position at which the approach run of the

exposure unit is started

[3]

[4]

Shading correction position 1

Shading correction position 2

[6] Position at which the reading of an image

is started

[1]

[2]

[3]

[4]

Exposure unit standby position

AE scanning range

PS14

Shading correction position 1

[5] Shading correction position 2

[6] Position at which the approach run of the

exposure unit is started

[7] Position at which the reading of an image

is started

[1] Exposure unit standby position [4] Shading correction position 2

[2] PS14 [5] DF reading position

[3] Shading correction position 1

7322ma2017

[1][6][2][3][4][5]

[1][7]

[2]

[3][4][5][6]

7322ma2018

7322ma2019

[1][2][3][4][5]

SCANNER SECTION

2-4

II UNIT EXPLANATION

1.2.3 Original read control

The light from the exposure lamp reflects back from the original, passes through a lens, and hits the CCD

sensor. The CCD sensor generates an electric signal (analog signal) corresponding to the light intensity.

Then, according to the instruction from the SCB (System control board), the ADB (A/D conversion board)

converts this signal into a digital signal.

A. Original read timing

(1) Platen mode, when the manual density is being set

(2) Platen mode, when the AE density is being set

[1] START button (ON) [4]

Position at which reading of the original starts

[2] Exposure lamp (forward) [5] Exposure scanning (backward)

[3] Position to which the exposure unit starts

[1]

[2]

[3]

[4]

START button (ON)

AE scanning (forward)

Position to which the exposure unit starts

Position at which reading of the AE density

started

[5]

[6]

[7]

[8]

AE scanning (backward)

Exposure lamp (forward)

Position at which reading of the original

starts

Exposure scanning (backward)

[1] [3] [4]

[2] [5]

M2 (Scanner motor)

PS14 (Scanner HP sensor)

[6] [8][2] [5]

[4] [7][1] [3][3]

M2 (Scanner motor)

PS14 (Scanner HP sensor)

SCANNER SECTION

2-5

II UNIT EXPLANATION

B. Original read timing (DF mode) *1

*1 In the DF mode, the operation when the manual density setting and the AE density setting is the same.

1.2.4 APS control

The APS control is carried out at close detection of the RADF, and controlled by the CB (Main body control

board), based on signals from the PS17 (APS sensor) and the CCD sensor. (For APS control by the

RADF, see DF service manual.)

A. APS operation

The PS17 (APS sensor) detects the original size in the sub scanning direction, while the CCD sensor

detects the original size in the main scanning direction.

B. Relationship between each of the sensors and the original size

[1] START button (ON) [4] Exposure conveyance

[2] DF reading position [5]

Position at which reading of the original starts.

[3] Position to which the original has been

conveyed in the specified distance.

[6] Starting point from the DF reading position

to the home position (exposure unit).

Original size CCD sensor

(Length of detection: mm)

PS17

(ON/OFF)

A3 297 ON

11 x 17 279.4 ON

B4 257 ON

[1]

[3]

[4][2]

[5] [6]

M2 (Scanner motor)

PS14 (Scanner HP sensor)

M301

(Original feed motor)

M302

(Original conveyance motor)

PS308 (Original registration sensor)

250mm/s

230mm/s

460mm/s

230mm/s

460mm/s

SCANNER SECTION

2-6

II UNIT EXPLANATION

*1 8.5 x 14 cannot be distinguished from 8.5 x 11R, and is detected as 8.5 x 11R.

C. APS detection timing

(1) Platen mode (when the RADF is closed)

(2) Platen mode (when the RADF is open)

8.5 x 14 *1 215.9 ON

8.5 x 11R 215.9 Metric system: ON Inch system: OFF

A4R 210 Metric system: ON Inch system: OFF

A4 297 OFF

8.5 x 11 279.4 OFF

B5R 257 OFF

A5R 210 OFF

B5 182 OFF

A5 148 OFF

5.5 x 8.5 139.7 OFF

B6 128 OFF

Postcard 102 OFF

[1] 1st original size detection [2] 2nd original size detection

[1] Original size detection [2] START button (ON)

Original size CCD sensor

(Length of detection: mm)

PS17

(ON/OFF)

[1] [2]

PS17 (APS sensor)

PS15 (APS timing sensor)

PS303 (DF open/close sensor)

[2]

[1]

PS17 (APS sensor)

PS15 (APS timing sensor)

PS303 (DF open/close sensor)

SCANNER SECTION

2-7

II UNIT EXPLANATION

1.2.5 AE control

During AE scan, the CCD sensor provided on the ADB (A/D conversion board) reads the density level of

the original. The CPU on the SCB (System control board) process the data and, based on the results,

selects the γ correction curve that will best reproduce the original.

A. AE sampling range

(1) While in platen copying

Main scanning direction

• Based on the original size recognized in the APS or out-of-original erasure mode, the range excepting

10mm in front and in rear.

Sub-scanning direction

• The range of 30mm from the leading edge of the original. However, the range excepting L/100mm in

left and right when the length of the original is L mm.

[1] Original [3] AE sampling range

[2] Leading edge of original

10 mm

30 mm

L mm

100 mm

100

[1]

[2]

[3]

SCANNER SECTION

2-8

II UNIT EXPLANATION

(2) While in DF copying

Main scanning direction

• Based on the original size recognized in the APS, the range excepting 20mm in front and in rear.

Sub-scanning direction

• The range between 1.5mm and 2.9mm from the leading edge of the original.

1.2.6 Image processing

A. AOC (Automatic offset control)

The analog offset voltage for the CCD sensor output is automatically adjusted by IC on the ADB (A/D

conversion board) so that this level becomes the lower limit for the A/D converter.

B. AGC (Automatic gain control)

The analog amplification for the CCD sensor output is automatically adjusted so that the CCD sensor

output level in the shading white correction becomes the upper limit for the A/D converter.

C. Shading correction

(1) Types of the shading correction

• White correction

• Black correction

(2) Execution timing

• At SW2 (Sub power switch) ON

• At the start of scan job

D. Other image processing

(1) Brightness/density conversion

(2) Text/dot pattern judgement

(3) Filtering

(4) Magnification change processing

(5) Error diffusion processing

(6) Data compression/elongation processing

[1] Original [3] AE sampling range

[2] Leading edge of original

20 mm

1.4 mm

2.9 mm

1.5 mm

[1]

[2]

[3]

WRITE UNIT

2-9

II UNIT EXPLANATION

2. WRITE UNIT

2.1 Composition

*1 7235 only

Symbol Name Function or method

[1] Index lens Converging of laser beams reflected from the index mirror

[2] INDEX (Index sensor board)

Control of the laser write position in the main scanning direction

[3] Polygon mirror Laser beam scanning

Hexahedron, 27,165rpm (7145) /38,976rpm (7235) /

33,071rpm (7228/7222)

[4] M5 (Polygon motor) Polygon mirror drive

DC brushless motor, PLL control

[5] LDB (LD drive board) Laser emission drive

1-chip/2-beam system, 15mW 780mm (7145)

1-chip/1-beam system, 5mW 780mm (Except the 7145)

[6] Collimator lens Making diffused laser beam parallel

[7] Cylindrical lens 1

Correction of the laser path against error in the angle of the polygon mirror

[8] Index mirror Reflection of laser beam upon the INDEX (Index senror board)

[9] fθ lens

Unified laser scanning speed against the laser irradiation surface on the drum

[10] Cylindrical lens 2

Correction of the laser path against error in the angle of the polygon mirror

[11] Dust-proof glass

Preventive measure for keeping the interior of the write unit clean

FM7*1 Polygon cooling fan

Cooling of the M5 (

Polygon motor

)

7322ma2002

FM7

[3][4]

[11][10][9][8][7][6][5]

[1]

[2]

SCB

7235 only

WRITE UNIT

2-10

II UNIT EXPLANATION

2.2 Operation

2.2.1 Image writing

The image data from the CCD sensor is converted into digital form by the ADB (A/D conversion board),

and its image processing is then carried out on the SCB (System control board). Based on the processed

image data, the image is written onto the drum by the laser beam output from the LDB (LD drive board).

2.2.2 Write control

A. Dot diameter adjustment

The sensor on the toner control sensor board detects the patch image density on the drum, and the

LDB (LD drive board) controls the quantity of laser beam so that its output value becomes the speci-

fied value.

(1) Timing for execution

a. While in copying

• Executed once for every 20 copies added up. However, when 20 copies are added up in the middle of

the job, the execution is made at the time of completion of the job.

b. Anytime other than while in copying

• While in the L inspection

• When the drum counter is reset

• When the sub power is turned on. However, this is subject to the settings 6 and 7 of the DIPSW16 in

the 25 mode.

B. APC (Automatic power control)

The LDB (LD drive board) monitors the laser output value for every one scan, and maintains the laser

beam quantity at the fixed level by driving the laser so that it becomes the output value set for the dot

diameter adjustment.

C. Write timing

The SCB (System control board) uses a laser detection signal from the INDEX (Index sensor board) to

determine the starting point for laser writing for every one scan in the drum shaft direction.

DRUM UNIT

2-11

II UNIT EXPLANATION

3. DRUM UNIT

3.1 Composition

Symbol Name Function or method

[1] TSL

(Transfer synchronization lamp)

Separation support

LED

[2] Transfer corona unit Transfer of toner from the drum to paper

DC positive corona discharge *1

Wire discharge: Tungsten wire with oxide film (φ 0.06mm)

With manual wire cleaning mechanism provided

Constant current DC output range: 0 to 350 µA

[3] Paper entrance guide plate Conveyance guide for paper supplied

High voltage applied to prevent toner adhesion: -500VDC

(constant voltage)

[4] Drum Image formation base

OPC drum (φ 60mm)

[5] Developing unit Formation of a toner image on the drum

(See “4. Developing unit”.)

[6] Charging corona unit Application of electric charge on the drum surface

DC corona discharge (Scotron)

Wire discharge: Gold-plated skin-pass tungsten wire

(φ 0.06mm)

With manual wire cleaning mechanism provided

Constant current DC output range: -320 to -1000 µA

Grid bias: Charging control plate

Constant current DC output range: -450 to -1090V

[1]

[10][9][8][7]

[6]

[2][3][4][5]

SD7

TCSB

DRUM UNIT

2-12

II UNIT EXPLANATION

*1 Control is made so that an output value becomes a little higher for a thick paper and a little lower for a

thin paper as compared with a plain paper.

Note for the transfer/separation corona

Caution:

• A copy should not be made when the ADU door is open with the interlock forcibly turned on. Oth-

erwise, the contact (spring) of the ADU door develops high voltage and you may get an electric

shock.

[7] PCL

(Pre-charging exposure lamp)

Erasure of potential on the drum surface

LED

[8] Cleaning/recycle section Cleaning and collection of toner on the drum

(See “5. Toner supply/cleaning/recycle section”.)

[9] Separation claw Support for the separation of paper from the drum

Pressure/release method by SD7 (Separation claw solenoid)

[10] Separation corona unit Separation of transferred paper from the drum

AC/DC corona discharge *1

Wire discharge: Tungsten wire with oxide film (φ 0.06mm)

With manual wire cleaning mechanism provided

Constant current AC output range: 1.5 to 5.0kV

Constant current DC output range: 0 to -300µA

SD7 Separation claw solenoid Separation claw pressure/release

24VDC drive

M1 Main motor Driving of the drum, cleaning/recycling section

DC brushless motor, PLL control

HV High voltage power High voltage power supply to the charging corona, transfer

corona, separation corona, paper entrance guide plate and

developing bias

Method to increase voltage by inverter from 24VDC

TCSB Toner control sensor board Detection of the patch image density on the drum

Detection of temperature around the drum

Symbol Name Function or method

DRUM UNIT

2-13

II UNIT EXPLANATION

3.2 Operation

3.2.1 Image formation timing (when copying two sheets)

A. In the case of the 7145

[1] ADU door [3] Transfer/separation corona unit

[2] Contact [4] HV (High voltage unit)

[1] START button (ON) [3] Driving of the separation claw to prevent

the trailing edge of paper from getting

stained.

[2] Varies depending on the type of paper.

[3]

[4]

[2] [1]

7322ma2020

[2] [3][1]

M1 (Main motor)

M3 (Developing motor)

PS1 (Registration sensor)

MC1 (Registration clutch)

PCL (Pre-charging exposure lamp)

HV (Charging corona)

HV (Developing bias)

HV (Transfer corona)

HV (Separation corona)

HV (Paper entrance guide plate)

TSL (Transfer synchronization lamp)

DS7 (Separation claw solenoid)

PS2 (Fixing exit sensor)

DRUM UNIT

2-14

II UNIT EXPLANATION

B. In the case of the 7235/7228/7222

[1] START button (ON) [3] Varies depending on the environment in

which it is installed.[2] Varies depending on the type of paper.

7322ma2012

[2]

[3]

[1]

M1 (Main motor)

PS1 (Registration sensor)

MC1 (Registration clutch)

PCL (Pre-charging exposure lamp)

HV (Charging corona)

HV (Developing bias)

HV (Transfer corona)

HV (Separation corona)

HV (Paper entrance guide plate)

TSL (Transfer synchronization lamp)

DS7 (Separation claw solenoid)

PS2 (Fixing exit sensor)

DEVELOPING UNIT

2-15

II UNIT EXPLANATION

4. DEVELOPING UNIT

4.1 Composition

*1 7145 only

Symbol Name Function or method

[1] TDS (Toner density sensor) Detection of toner density in the developing unit

L detection method

[2] Developing sleeve Coveyance of developing materials by magnetic force to the

drum surface

Two-component developing method (developing materials:

Toner + Carrier)

Developing bias voltage applied

Constant voltage DC output range: -350 to -830V

[3] Developing regulation plate Regulation of the spiking amount of developing materials on

the developing sleeve

Regulation plate method

[4] Agitator screw Agitation of developer and conveyance of developing materials

to the agitator wheel

Agitator wheel method

[5] Agitator wheel Agitation of developer and conveyance of developing materials

to the developing sleeve

4-vane wheel method

M1 Main motor Driving of the agitating turbine, the agitating screw and the

developing sleeve (except the 7145)

DC brushless motor, PLL control

M3*1 Developing motor Driving of the developing sleeve

7322ma2003e

[1]

[5][4]

[2][3]

7235/7228/7222

7145

DEVELOPING UNIT

2-16

II UNIT EXPLANATION

4.2 Operation

4.2.1 Developing control

For details of each operation timing of developing, see “3. Drum section”.

4.2.2 Control of toner density in the developing unit

The TDS (Toner density sensor) uses the L detection method (detection of permeability in developing

materials) to detect the toner density of developing materials. The value thus obtained is compared with

the standard value of the toner density for the L detection adjustment that is recorded in the PCU con-

tained in the CB (Main body control board) to see if toner should be supplied or not. (For details of toner

supply, see “5. Toner supply/cleaning/recycling section”.)

TONER SUPPLY/CLEANING/RECYCLE UNIT

2-17

II UNIT EXPLANATION

5. TONER SUPPLY/CLEANING/RECYCLE UNIT

5.1 Composition

Symbol Name Function or method

[1] Toner collection sheet Collection of toner separated by the cleaning blade from the drum

surface

Rotating collection method

[2] Cleaning blade Drun cleaning

Drum contact/separation method

[3] Toner conveyance screw Agitation of toner and conveyance of toner to the developing unit

Screw method

[4] TLD (Toner level sensor) Detection of the toner level in the toner supply unit (Detected

when the residual quantity of toner gets to about 30g.)

Piezo element method

[5] Toner bottle Toner supply (bottle capacity: 676g)

Toner bottle rotation method

[6] Toner supply paddle Conveyance of toner from the toner bottle to the toner supply unit

Fixed method (Since the toner bottle rotates, this serves as the

toner introduction section.)

[7] Toner agitation plate Agitation of toner supplied from the toner bottle and the cleaning/

recycle section, and conveyance of the toner to the toner convey-

ance screw

Screw method

[8] Collected toner conveyance

screw

Conveyance of toner from the cleaning section to the toner supply

unit

Screw method

[3]

[2]

[1]

[7][6] [8][5] [9][4]

SD9

M10

TONER SUPPLY/CLEANING/RECYCLE UNIT

2-18

II UNIT EXPLANATION

5.2 Operation

5.2.1 Toner supply control when the toner level in the toner supply section gets reduced

A. Toner supply operation:

When toner in the toner supply unit is running short, the TLD (Toner level sensor) turns on. This

causes the M10 (Toner supply motor 2) to turn on to rotate the toner bottle and replenish toner to the

toner supply unit. When toner has been supplied, the TLD turns off to monitor the toner level.

B. Operation when toner is not supplied:

When the TLD (Toner level sensor) has been kept turned on for the specified period of time, it is con-

sidered that no toner remains in the toner bottle and a message is displayed on the operation LCD.

C. Toner level detection timing:

The TLD (Toner level sensor) detects at all times the toner level during copy operation.

[9] PS5 (Toner bottle sensor) Detection of the setting of the toner bottle

Photosensor

M1 Main motor Driving of the toner collection sheet and the collected toner con-

veyance screw

DC brushless motor, PLL control

M4 Toner supply motor 1 Driving of the toner conveyance screw and the toner agitator plate

Stepping motor

M10 Toner supply motor 2 Toner bottle

Stepping motor

SD9 Toner solenoid Transmission of driving force from the M4 (Toner supply motor) to

the toner conveyance screw

24VDC drive

Symbol Name Function or method

TONER SUPPLY/CLEANING/RECYCLE UNIT

2-19

II UNIT EXPLANATION

5.2.2 Toner supply control when toner density in the developing unit gets reduced

A. When power is on:

The TDS (Toner density sensor) detects the toner density in the developing unit the specified period of

time after the SW2 (Sub power switch) is turned on. When the value thus detected at this time is

below the initial density recorded in the CPU contained in the CB (Main body control board), the M4

(Toner supply motor 1) and the SD9 (Toner solenoid) are turned on to start to replenish toner up to the

specified level of density.

B. While in copy operation:

While in copy operation, the TDS (Toner density sensor) monitors the toner density. Using the output

voltage of the TDS to turn on the SD9 (Toner solenoid), the M4 (Toner supply motor 1) determines the

time required for toner supply.

TDS output voltage Time required for toner supply

2.01V or less 0 sec.

2.02 to 2.08V 0.10 sec.

2.09 to 2.16V 0.20 sec.

2.17 to 2.23V 0.30 sec.

2.24 to 2.31V 0.40 sec.

2.32 to 2.39V 0.50 sec.

2.40V or more 0.70 sec.

PAPER FEED UNIT

2-20

II UNIT EXPLANATION

6. PAPER FEED UNIT

6.1 Composition

Symbol Name Function or method

[1] VRI (Bypass tray paper size

sensor VR)

Detection of paper size in the direction of the width of the by-

pass tray

[2] PS20

(Bypass tray paper size sensor)

Detection of paper size in the direction of the length of the by-

pass tray

[3] PS13

(Bypass tray no paper sensor)

Detection of the presence of bypass feed paper

[4] Double feed prevention roller Double feed prevention of paper, Torque limiter

[5] Conveyance roller Paper conveyance

[6]*1 PS22 (Timing sensor/L) Detection of tray 2 paper conveyance condition

[7] Double feed prevention roller Double feed prevention of paper, Torque limiter

[8] M8 (Tray motor/L) Tray 2 paper liftup plate drive, DC motor

[9] Feed roller 1st paper feed power transmission

[10] PS12 (Tray set sensor/L) Tray 2 detection and remaining paper detection

[11] PS10 (Upper limit sensor/L) Tray 2 paper upper limit detection

[12] PS11 (No paper sensor/L) Detection of the presence of tray 2 paper

[13] Paper feed roller Tray 2 paper feed

[14] M7 (Tray motor/U) Tray 1 paper liftup plate drive, DC motor

*1 7145/7235/7228 only

SD2

SD3

SD1

MC2

PFDB/U

PFDB/L

[18] [19] [20] [21] [22] [23] [24] [25] [26] [27]

[1]

[2]

[3][4][5][6][7][8][9][10][11][12]

[13]

[14]

[15]

[16]

[17]

PAPER FEED UNIT

2-21

II UNIT EXPLANATION

6.2 Operation

6.2.1 Tray up drive control

Since the operation is the same for both the tray 1 and the tray 2, the explanation is given of the tray 1.

When the paper feed tray is set, the PS9 (Tray set sensor/U) detects the tray with the M7 (Tray motor/U)

turned on. This causes the paper up/down plate in the tray to go up. When the PS7 (Upper limit sensor/U)

detects the paper upper limit, the M7 is turned off. When the sheets of paper get reduced as they are being

fed through, the PS7 detects no remaining paper. At this time, the M7 is kept turned on until it detects the

paper upper limit again, and paper is raised up to the specified level at all times.

When the tray is removed, its coupling with the drive section is disconnected to let the paper up/down plate

go down by its own weight.

When papar is supplied by the bypass feed method and the SD3 (Bypass solenoid) turns on after the M9

(Paper feed motor) turns on, the bypass plate goes up to raise paper.

[15] PS9 (Tray set sensor/U) Tray 1 detection and remaining paper detection

[16] PS8 (No paper sensor/U) Detection of the presence of tray 1 paper

[17] PS7 (Upper limit sensor/U) Tray 1 paper upper limit detection

[18] Paper feed roller Tray 1 paper feed

[19] Double feed prevention roller Double feed prevention of paper, Torque limiter

[20] Feed roller 1st paper feed power transmission

[21]*1 PS21 (Timing sensor/U) Detection of tray 1 paper conveyance condition

[22] Conveyance roller Paper conveyance

[23] PS1 (Registration sensor) Detection of the paper passage for the Registration roller rota-

tion ON/OFF

[24] Registration roller Paper conveyance

[25] Conveyance roller Paper conveyance

[26] Feed roller Bypass tray paper feed

[27] Paper feed roller Paper feed

M9 Paper feed motor Paper feed system drive, DC brushless PLL control

MC2 Loop clutch 1st paper feed power transmission

SD1 1st paper feed solenoid/U Tray 1 paper feed power transmission

SD2 1st paper feed solenoid/L Tray 2 paper feed power transmission

SD3 Bypass solenoid Bypass tray paper feed power transmission

PFDB/U

Paper feed detection board/U Tray 1 paper size detection

PFDB/L

Paper feed detection board/L Tray 2 paper size detection

CB Main body control board Overall control

*1 7145/7235/7228 only

Symbol Name Function or method

PAPER FEED UNIT

2-22

II UNIT EXPLANATION

6.2.2 Paper feed control

The following shows the timing of paper feed by the tray 1. The timing of paper feed is basically the same

for both the tray 2 and the bypass tray, and the actual paper feed in each case starts when the SD2 (1st

paper feed solenoid/L) or the SD3 (Bypass solenoid) turns on respectively.

6.2.3 Remaining paper detection control

Since the operation is the same for both the tray 1 and the tray 2, the explanation is given of the tray 1

only.

The remaining paper quantity is detected by the PS9 (Tray set sensor/U). As the remaining paper is get-

ting reduced, the actuator provided on the rear side of the tray starts to ratate gradually as shown in the

drawing. The PS9 turns on and off each time it passes through a slit. The remaining paper quantity is

detected by counting the number of ON/OFF's after the installation of the tray.

0 count: Full 1 count: Medium 2 counts: Low

[1] START button (ON)

[1] Rotating direction when the paper up/down

plate is going up.

[3]

[4]

Slit 1

Slit 2

[2] PS9 (Tray set sensor/U) [5] Actuator

[1]

M9 (Paper feed motor)

SD1 (1st paper feed solenoid/U)

PS21 (Timing sensor/U)

MC2 (Loop clutch)

PS1 (Registration sensor)

[5]

[4]

[3]

[2]

[1]

PAPER FEED UNIT

2-23

II UNIT EXPLANATION

6.2.4 Paper size detection

The paper size in the tray is detected by the CB (Main body control board), using signals sent from the

PFDB/U (Paper feed detection board/U) and the PFDB/L (Paper feed detection board/L).

The paper size in the tray is set by the SW1 of the PFDB/U and the PFDB/L, and the CB detects a switch

signal according to the position of the SW1. The table below shows the relationship between the switch

signal and the paper size.

For metric area

For inch area

Paper size Switch signal

Tray 1 Tray 2 SIZE A SIZE B SIZE C SIZE D

8.5 x 14 11 x 17

B5 B5 {

B4 B4 {

A5R A5R {{

A4 A4 {

A4R A4R {{

F4 A3 {{

5.5 x 8.5R F4 {{{

8.5 x 11 8.5 x 11 {

8.5 x 11R 8.5 x 11R {{

Paper size Switch signal

Tray 1 Tray 2 SIZE A SIZE B SIZE C SIZE D

8.5 x 14 11 x 17

B5R A5R {

B4 A4 {

A5R A4R {{

A4 A3 {

A4R F4 {{

F4 5.5 x 8.5R {{

5.5 x 8.5R 8.5 x 11 {{{

8.5 x 11 8.5 x 11R {

8.5 x 11R 8.5 x 14 {{

FIXING UNIT

2-24

II UNIT EXPLANATION

7. FIXING UNIT

7.1 Composition

Symbol Name Function or method

[1] Fixing pressure roller Fixing of toner by pressure

Silicon rubber + PFA tube

[2] Fixing heat roller Toner fixing by means of heat

Aluminum + PFA coating

Temperature setting:

Idling: 376 to 369°F

While in copy operation - Other than when feeding paper by the

by-pass tray in the single sided copy mode: 381°F

While in copy operation - When feeding paper by the bypass tray

in the single sided copy mode (by selecting the type of paper)

• Thick paper mode 1: 381 + 50°F

• Thick paper mode 2: 381 + 50°F

• Thin paper: 381 - 50°F (Except the 7145)

• Other than the above: 381°F

Copying - 381 - 41°F, when a double sided copy is being made.

Low power mode: 185°F (can be changed in the 25 mode)

[8] [7] [6]

[5]

[4]

[3]

[2]

[1]

[13]

[12]

[11]

[10]

[9]

DCPS

SD4

M11

FCB

FIXING UNIT

2-25

II UNIT EXPLANATION

[3] TH2 (Fixing temperature

sensor/2)

Detection of temperature at the edge (front side) of the fixing heating

roller

Contact type

[4] TH1 (Fixing temperature

sensor/1)

Detection of temperature at the center of the fixing heating roller

Contact type

[5] Cleaning web Cleaning of the fixing heat roller

Web wind-up method

[6] Fixing cleaning roller Tension pressure on the cleaning web

Spring pressure

[7] TS (Thermostat) Protection of the fixing heat roller against high temperature abnor-

mality (about 428°F)

Contact type

[8] L3 (Fixing heater lamp/2) Heating of the fixing heat roller (Sub)

AC drive

[9] L2 (Fixing heater lamp/1) Heating of the fixing heat roller (Main)

AC drive

[10] Fixing guide Paper conveyance guide, pressure/release of the fixing pressure

roller

[11] PS2 (Fixing exit sensor) Detection of paper at the fixing unit exit

Photosensor + actuator

[12] Neutralizing brush Neutralizing of paper that is exited

Neutralizing by means of a brush

[13] Fixing claw Separation of paper from the fixing heat roller

Spring pressure type (6 pcs.)

M11 Fixing motor Driving of the fixing heat roller and the ADU conveyance roller/1

DC brushless motor, PLL control

SD4 Cleaning web solenoid Driving of the cleaning web

24V drive

FCB Fixing control board Prevention of noise leak in the drive power for L3 (Fixing heater lamp

/2)

220V system only

Symbol Name Function or method

FIXING UNIT

2-26

II UNIT EXPLANATION

7.2 Operation

7.2.1 Fixing temperature control

The CB (Main body control board) uses the TH1 (Fixing temperature sensor/1) and the TH2 (Fixing tem-

perature sensor/2) to detect the temperature of the fixing heating roller, and turns on and off the L2 (Fixing

heater lamp/1) and the L3 (Fixing heater lamp/2) separately through the DCPS (DC power source) to

maintain both the TH1 and the TH2 at the specified temperature.

A. Warm-up

The CB (Main body control board) turns on the fixing heater lamp circuit within the DCPS (DC power

source) immediately after the SW2 turns on, and keeps the L2 (Fixing heater lamp/1) and L3 the (Fix-

ing heater lamp/2) turned on until the fixing heat roller reaches the specified temperature.

Once warm-up has completed, the CB switches the L2 and the L3 on and off so that the fixing heat

roller can be maintained to the set temperature for idling.

• Warm-up time: 30 seconds or less (at the room temperature of 68°F) (7145)

• Warm-up time: 19 seconds or less (at the room temperature of 68°F) (7235/7228/7222)

7.2.2 Cleaning web control

For each output of paper, the cleaning web is let off to be wound up.

The SD4 (Cleaning web solenoid) turns on based on the output of the PS2, causing the cleaning web to be

driven to start a wind-up operation.

[1] START button (ON) [2] 100 msec

[1] [2]

PS2 (Fixing exit sensor)

SD4 (Cleaning web solenoid)

ADU/PAPER EXIT SECTION

2-27

II UNIT EXPLANATION

8. ADU/PAPER EXIT SECTION

8.1 Composition

Symbol Name Function or method

[1] PS2 (Fixing exit sensor) Detection of paper at the fixing unit exit

Photosensor + actuator

[2] ADU unit (ADU door) Paper conveyance while in double sided copy

Jam removal while in double sided copy

[3] ADU conveyance roller/1 Paper conveyance through the ADU entrance

Motor drive

[4] Decurler roller (7145)

Conveyance roller (7235/

7228/7222)

Paper conveyance through the ADU intermediate section and the cor-

rection of paper curling (7145)

Paper conveyance through the ADU intermediate section (7235/7228/

7222)

Motor drive

[5] ADU conveyance roller/2 Paper conveyance through the ADU intermediate section

Motor drive

[6] Switching sheet Switching of conveyance path at the paper reverse section

Switching by means of the elasticity of the PET sheet

7322ma2004e

[7]

[6]

[5]

[4]

[3]

[2]

[1]

[10]

[9]

[8]

SD5

ADUDB

M11

7235/7228/7222

7145

ADU/PAPER EXIT SECTION

2-28

II UNIT EXPLANATION

*1 Except the 7145

[7] ADU roller

Paper conveyance through the ADU exit and switching of the conveyance direction

Motor drive

[8] PS4 (ADU sensor) Detection of paper at the ADU exit

Photosensor + actuator

[9] Paper exit roller Paper exit

Motor drive

[10] Switching guide Switching of the paper exit path at the fixing unit exit

Solenoid drive

ADUDB

ADU drive board Driving of the M6 (ADU motor)

M6 ADU motor Driving of the ADU motor

Stepping motor

M9 Paper feed motor Driving of the decurler roller (7145 only) and the ADU conveyance

rollers/2

DC brushless motor, PLL control

SD5 ADU gate solenoid Pressure and release of the switching guide

24VDC drive

M11 Fixing motor Driving of the paper exit roller

DC brushless motor, PLL control

Symbol Name Function or method

ADU/PAPER EXIT SECTION

2-29

II UNIT EXPLANATION

8.2 Operation

8.2.1 Switching control of the paper exit/ADU conveyance path

A. Straight paper exit path

The straight paper exit path is applicable when a single side is copied as well as after the back side

copy of paper is completed in the double sided copy mode.

[1] Switching guide (SD5 OFF) [5] Fixing pressure roller

[2] PS2 (Fixing exit sensor) [6] Fixing heat roller

[3] ADU conveyance driven roller/1 [7] Paper exit driven roller

[4] ADU conveyance roller/1 [8] Paper exit drive roller

[3]

[4][5][6]

[7]

[2]

[1]

[8]

ADU/PAPER EXIT SECTION

2-30

II UNIT EXPLANATION

B. ADU conveyance path

The ADU conveyance path is applicable after the front side copy is completed in the double sided

copy mode.

C. Straight paper exit operation (single sided 3 copies)

[1] PS2 (Fixing exit sensor) [5] Fixing heat roller

[2] ADU conveyance driven roller/1 [6] Switching guide (SD5 ON)

[3] ADU conveyance roller/1 [7] Paper exit driven roller

[4] Fixing pressure roller [8] Paper exit drive roller

[1] 1st paper exit

[2]

[3][4][5]

[7]

[1]

[6]

[8]

[1]

PS2 (Fixing exit sensor)

SD5 (ADU gate solenoid)

M1 (Main motor)

M11 (Fixing motor)

ADU/PAPER EXIT SECTION

2-31

II UNIT EXPLANATION

D. ADU conveyance operation (double sided 3 copies)

8.2.2 ADU conveyance control

When a sheet of paper, the front of which has been printed in the double sided mode is conveyed to the

ADU unit, it is further conveyed to the ADU roller by the decurler roller (7145) or conveyance roller (except

the 7145) and the ADU conveyance rollers/2 which are in turn driven by the M9 (Paper feed motor).

[1] 1st paper exit for the front side [2] 1st paper exit for the back side

7322ma2005

[2][1]

MC2 (Loop clutch)

PS2 (Fixing exit sensor)

SD5 (ADU gate solenoid)

M1 (Main motor)

M11 (Fixing motor)

ADU/PAPER EXIT SECTION

2-32

II UNIT EXPLANATION

8.2.3 Paper reverse control

A. Paper reverse path

(1) When conveying paper

When a sheet of paper is conveyed from the ADU conveyance roller/2, it is further conveyed to the

ADU roller by pushing the switching sheet open.

[1] ADU conveyance driven roller/2 [6] ADU roller

[2] ADU driven roller [7] Switching sheet

[3] Conveyance path when DB is provided [8] PS4 (ADU sensor)

[4] DB [9] ADU conveyance roller/2

[5] Conveyance path when DB is not provided

7322ma2006

[4]

[3]

[6]

[5]

[7]

[8]

[9]

[2]

[1]

ADU/PAPER EXIT SECTION

2-33

II UNIT EXPLANATION

(2) When paper reverse

Paper that has been conveyed is sent back by means of the reverse rotation of the ADU roller. At this

time, the switching sheet uses its own elastic power to block the conveyance path to the ADU convey-

ance roller/2, and the paper is conveyed to the loop roller of the tray 2. As a result, the paper is turned

inside out to be copied on the back side after passing through the same route as that for the paper

sent from the tray 2.

B. Paper reverse operation (7145)

[1] Loop roller [5] DB

[2] PS4 (ADU sensor) [6] ADU roller

[3] Switching sheet [7] ADU conveyance roller/2

[4] ADU driven roller

[1] Start of 1st paper conveyance [4] Start of reverse operation of 2nd paper

[2] Start of revere operation of 1st paper [5] Start of 3rd paper conveyance

[3] Start of 2nd paper conveyance [6] Start of reverse operation of 3rd paper

7322ma2007

[7]

[2]

[3]

[4]

[5]

[1]

[6]

[1] [2] [3] [4] [5] [6]

PS4 (ADU sensor)

M6 (ADU motor) F

M9 (Paper feed motor)

600mm/s

230mm/s

ADU/PAPER EXIT SECTION

2-34

II UNIT EXPLANATION

C. Paper reverse operation (7235/7228/7222)

*1 165mm/s (7235) 140mm/s (7228/7222)

[1] Start of 1st paper conveyance [4] Start of reverse operation of 2nd paper

[2] Start of revere operation of 1st paper [5] Start of 3rd paper conveyance

[3] Start of 2nd paper conveyance [6] Start of reverse operation of 3rd paper

7322ma2013

[1] [2] [3] [4] [5] [6]

PS4 (ADU sensor)

M6 (ADU motor) F

M9 (Paper feed motor)

600mm/s

INTERFACE SECTION

2-35

II UNIT EXPLANATION

9. INTERFACE SECTION

9.1 Composition

In the case of the 7145

In the case of the 7235/7228/7222

Symbol Name Function or method

[1] Serial port (USB TypeB) For ISW of copier/FAX, For serial output of the printer

Ver. 1.1

[2] Serial port (RS-232C) For KRDS communication

D-SUB 9-pin connector

[3] RJ45 Ethernet port Port for network

[4] Parallel port

(IEEE1284 (Compatible,

Nible, ECP))

For ISW of copier/FAX/printer

For parallel output of the printer

36-pin parallel interface

[1]

[2]

[3]

[4]

7322ma2008

[2]

[3]

[4]

[1]

NETWORK SECTION

2-36

II UNIT EXPLANATION

10.NETWORK SECTION

10.1 Composition

Item Function name Function Purpose Remarks

TCP/IP service Arp {Obtain IP address

BootP {Obtain IP address

DHCP {Obtain IP address

DNS {Settle IP address

FTP Client {Scan to FTP

FTP Server {Scan to Box

IPP {Print Support Ver. 1.0

LPD/LPR {Print

Raw Socket {Print

Default port number = 9100

SMTP {Scan to Email

POP {For POP before SMTP

POP before SMTP {Authorization of SMTP

server access

HTTP 1.1 {WebUtility

SNMP v1

(SNMP over TCP)

{MIB access

SNMP v1

(

SNMP over IPX

)

{MIB access

Telnet X

SLP X

Netware service Bindery {Print

NDS (including simul-

taneous support of

Bindery)

{Print

• PServer mode {

•

RPrinter/NPrinter mode

{

NDPS

(

Gateway

)

{Print Corresponding in general

purpose Gateway

PCONSOLE /NWAD-

MIN, interchangeable

{

Frame Type (802.3, 8-

02.3, 802.3 SNAP,

Ethernet II)

{MAC frame corre-

sponding

AppleTalk service

EtherTalk PAP {Print

MS Network service

SMB over NetBEUI X Print

OTHER CONTROLS

2-37

II UNIT EXPLANATION

11. OTHER CONTROLS

11.1 Parts Energized When the Main Power Switch is OFF

The follwing components are powered regardless of whether the SW1 (Main power switch) is on or off,

provided that the power cord remains plugged in.

A. CBR 1 and CBR 2 (Circuit breakers/1 and /2)

The circuit breakers serve to protect internal components against damage from short circuit. If current

exceeds the specified value, the circuit breaker(s) will go off, cutting the power to the system.

B. NF (Noise filter)

This filter reduces noises that enter through the power line.

C. DCPS (DC power source)

This supplies power to each unit, and also controls the ON/OFF state of the fixing heater lamp.

SW1

DCPS

AC(H)

AC(N)

CBR1

CBR2

OTHER CONTROLS

2-38

II UNIT EXPLANATION

11.2 Components Operated When the Power Switch is ON

11.2.1 Components operated when the SW1 (Main power switch) is on

In the case of the 7145

Setting the SW1 (Main power switch) to the ON position supplies AC power to the DCPS (DC power

source) which in turn supplies +12DVC, -12VDC, and +5DVC to the SCB (System control board). The

DCPS also supplies +5DVC to the OB (Operation board) through the SCB.

When the PTC (Internal heater) is provided as an option for service parts, according to the setting of the

25 mode DIP SW16-2, +24VDC is supplied to the PTC (Heater) from the DCPS (DC power source).

If options such as a printer controller (IP-432) and/or fax control board (FK-102 Type A/FL-102) are

installed, +12VDC, -12VDC and +5VDC are also supplied to these options through the SCB (System con-

trol board).

In the automatic start-up mode, the same operation is made consecutively as when the SW2 (Sub power

switch) is turned on according to the discretion of the SCB (System control board).

7322ma2009

SW1

DCPS

SCB

PTC

(OPTION)

IP-432

(OPTION)

+12VDC

-12VDC

+5VDC

+24VDC

+12VDC

-12VDC

PSW2B

SW2

+5VDC

SGND

+5VDC

+12VDC

-12VDC

+5VDC

+12VDC

-12VDC

+5VDC

SUB_SW

FK-102/FL-102

(OPTION)

OTHER CONTROLS

2-39

II UNIT EXPLANATION

In the case of the 7235/7228/7222

Setting the SW1 (Main power switch) to the ON position supplies AC power to the DCPS (DC power

source) which in turn supplies +12DVC and +5DVC to the SCB (System control board). The DCPS also

supplies +5DVC to the OB (Operation board) through the SCB.

When the PTC (Internal heater) is provided as an option for service parts, according to the setting of the

25 mode DIP SW16-2, +24VDC is supplied to the PTC (Heater) from the DCPS (DC power source).

If options such as a printer controller (IP-424) and/or fax control board (FK-103/FL-103) are installed,

+12VDC and +5VDC are also supplied to these options through the SCB (System control board). How-

ever, when the LAN cables are not connected with none of these options provided, a part of the section

within the SCB (System control board) is not supplied with +5 VDC.

In the automatic start-up mode, the same operation is made consecutively as when the SW2 (Sub power

switch) is turned on according to the discretion of the SCB (System control board).

11.2.2 Components operated when the SW2 (Sub power switch) is on

The SW2 (Sub power switch) is located on the PSW2B (Power SW2 board). Upon the SW2 on, an ON sig-

nal is sent from the SW2 to the SCB (System control board) through the OB (Operation board). As a result,

the SCB sends a control signal to the DCPS (DC power source), thus causing the DCPS to supply

+12VDC, -12VDC (7145 only) and +5VDC to all of the boards and options, including the CB (Main body

control board).

The SCB (System control board) then sends to the DCPS (DC power source) a control signal that causes

the DCPS to generate +24VDC. This 24VDC power is supplied to all of the drive boards and options.

7322ma2021

SW1

DCPS

SCB

PTC

(OPTION)

IP-424

(OPTION)

+12VDC

+5VDC

+24VDC

PSW2B

SW2

+5VDC

SGND

+12VDC

+5VDC

+12VDC

+5VDC

+12VDC

+5VDC SUB_SW

FK-103/FL-103

(OPTION)

OTHER CONTROLS

2-40

II UNIT EXPLANATION

11.3 Fan Control

11.3.1 Composition of the cooling fan

*1 7145/7235 only

*2 7145 only

*3 7235 only

Symbol Name Function or method

FM1 DC power supply cooling fan Cooling of the DCPS (DC power source)

FM2*1 Fixing cooling fan Preventing the ends of the fixing roller from getting overheated

FM3 Internal dehumidifying fan/1 Prevention of internal dew condensation, removal of internal

ozone, and prevention against internal temperature getting too

high

FM4 Internal cooling fan/1 Cooling of the drum unit, the write unit and their surroundings

FM5 Developing suction fan Prevention against scattering of toner around the developing unit

FM6 Internal dehumidifying fan/2 Prevention of internal dew condensation, removal of internal

ozone, and prevention against internal temperature getting too

high

FM7*2 Internal cooling fan/2 Cooling of the interior of the developing unit

FM7*3 Polygon cooling fan Cooling of the M5 (Polygon motor)

FM2FM1

DCPS CB

FM3 FM4 FM5 FM6 FM7

OTHER CONTROLS

2-41

II UNIT EXPLANATION

11.3.2 Fan operation

A. Operation of fans other than FM4 (Internal cooling fan/1)

*1 Operation for a small sized paper (such as B5R, A5R, B6R, postcard, 5.5 x 8.5R, 16KR). For paper

sizes other than these small ones, the fan turns on when the TH2 (Fixing temperature sensor/2)

detects a temperature above 417°F, and turns off when it gets below 408°F

*2 7145 only

In the case of the 7235/7228/7222, the operation of the fan, that is based on whether the M3 (Develop-

ing motor) turns ON or OFF while in the 7145, is based on whether the M1 (Main motor) turns ON or

OFF.

*3 7145 only

*4 7235 only

B. Operation of FM4 (Internal cooling fan/1)

(1) ON/OFF timing

The FM4 (Internal cooling fan/1) is turned on when the machine-inside temperature sensor provided

on the TCSB (Toner control sensor board) detects a temperature of 109°F, and turned off when the

temperature gets below 105°F.

(2) Abnormality detection

The internal temperature sensor installed on the TCSB (Toner control sensor board) detects a temper-

ature of 136°F, error code F22-1 is displayed on the operation unit and the machine is stopped.

[1] START button (ON)

7322ma2014

[1]

M1 (Main motor)

M3 (Developing motor)*2

FM1 (DC power source fan)

FM2 (Fixing cooling fan)*1

FM3 (Internal dehumidifying fan/1)

FM5 (Developing suction fan)

FM6 (Internal dehumidifying fan/2)

FM7 (Internal cooling fan/2)*3

FM7 (Polygon cooling fan)*4

OTHER CONTROLS

2-42

II UNIT EXPLANATION

11.4 Operation Unit Control

11.4.1 Composition of operation unit

Symbol Name Function or method

SW2 Sub power switch Power switch for the operating section

Does not function when the SW1 (Main power switch) is off.

PSW2B Power SW2 board LED packaging to display the on/off status of the SW1 (Main

power switch)

LCD LCD Use to display various information

LCDB Display board Backlight for the LCD

INV2 Display inverter Inverter used to drive the LCD (Display board)

PAKB Panel key board Touch switch board used to directly select items displayed on the

LCD

SP Speaker When an optional fax control board is installed, a monitor sound

on the line while a call is being made.

OB Operation board Used to control the PSW2B (Power SW2 board), the LCD (Dis-

play board), the INV2 (Display inverter) and the PAKB (Panel key

board), and also used to control the LED inside the OB and the

ten-key

SCB OB

LCD

LCDB

(OPTION)

INV2

PAKB

PSW2B

SW2

SGND

SUB_SW

OTHER CONTROLS

2-43

II UNIT EXPLANATION

11.5 Counter Control

11.5.1 Counter composition

11.5.2 Counter operation

This machine uses the following two software counters to count the number of copies. However, the con-

tent of the number display counter on the OB (Operation board) may differ depending on the operating

condition of the machine.

A. Paper feed counter

This counter increments when the 1st paper feed for the next copy comes ON.

B. Paper exit counter

This counter increments when the PS2 (Fixing exit sensor) goes ON → OFF.

C. Number display counter on the OB (Operation board)

Symbol Name Function or method

OB Operation board Displays the number of copies by means of the LED.

TC Total counter

(7145 provided as a standard equipment)

(7235/7228/7222 optional)

Displays the total number of copies.

This is a mechanical counter driven by an electric signal.

KC Key counter (optional) A counter used to make copying unavailable after the

specified number of copies is counted

This is a mechanical counter driven by an electric signal.

PS2 Fixing exit sensor Detects paper at the fixing exit. This information

becomes a control signal source for each counter.

Photosensor + actuator

Normal operation Jam

Indicator shows a count from the paper feed counter. Indicator shows a count from the paper exit counter.

7322ma2011e

7145 7235/7228/7222

SCB

(OPTION)

PS2

OTHER CONTROLS

2-44

II UNIT EXPLANATION

Blank page

EXTERNAL SECTION

3-1

III DIS./ASSEMBLY

III DISASSEMBLY/ASSEMBLY

Caution:

• Make sure the power cord of the copier is

unplugged from the power outlet before dis-

assembly or assembly.

1. EXTERNAL SECTION

1.1 Replacing the Ozone Filter

A. Periodically replaced parts/cycle

• Ozone filter: Every 240,000 copies (7145)

• Ozone filter: Every 200,000 copies (7235/7228/

7222)

B. Procedure

1. Remove the 4 screws [1], and remove the scan-

ner exterior/R [2].

Note:

• If an unusual noise is emitted when you open or

close the bypass tray, clean the ADU door rib [3]

with alcohol.

2. Remove the ozone filter [1].

3. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the ozone filter, take care not to

break it.

[1]

[3]

[2]

[1]

EXTERNAL SECTION

3-2

III DIS./ASSEMBLY

1.2 Replacing the Filter Cover

Assembly & Suction Filter/A

A. Periodically replaced parts/cycle

• Suction filter/A: Every 120,000 copies (7145)

• Suction filter/A: Every 100,000 copies (7235/

7228/7222)

• Filter cover assembly: Every 120,000 copies

(7145)

• Filter cover assembly: Every 100,000 copies

(7235/7228/7222)

B. Procedure

1. Remove the screw [1], then remove the filter

cover assembly [2].

2. Remove the suction filter /A [3].

3. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the suction filter/A, be sure to

install it so that the white filter face is turned to the

inside of the main body.

Note:

• When an elevator tray unit is fitted, perform the

following to access the filter section.

• While pressing [1], lift up [2], and pull out the ele-

vator tray unit and the horizontal conveyance unit.

Do not remove the finisher.

To remove the finisher, see [III. DISASSEMBLY/

ASSEMBLY] of the finisher section.

[1]

[2]

[3]

[1]

[2] 7145ma3130

DRIVE SECTION

3-3

III DIS./ASSEMBLY

2. DRIVE SECTION

2.1 Removing and Reinstalling

the Motor Units (Main, Fix-

ing, Feed, Developing)

Caution:

• Be sure to remove the drum unit from the

main body before removing or reinstalling

the main motor unit. If the drum unit is in

place at this time, the drum will rotate when

you install or remove the drum rotating plate,

resulting in possible damage to the cleaning

blade.

A. Procedure

1. Remove the developing unit and drum unit from

the main body.

2. Remove the screw [1], and remove the cord

cover/B [2].

3. Remove the 2 screws [3], and remove the cord

cover/A [4].

4. Remove the 9 screws [5], and remove the rear

cover [6].

5. Remove the 2 screws [1], and remove the rear

cover/R [2], the rear cover/L [3].

6. Remove the 3 screws [4], and remove the wire-

bundle guide plate [5].

7322ma3001

[5]

[3]

[6]

[2][4] [1]

[3]

[4]

[5]

[1]

[2]

[1]

DRIVE SECTION

3-4

III DIS./ASSEMBLY

7. Remove the 15 screws [1], and remove the

board cover/D [2] (7145 only).

8. Remove the 13 screws [3], and remove the

board cover/A [4].

9. Remove the various wiring connectors from the

SCB (System control board) [1].

Note:

• Be very careful when handling the ribbon cable

connector from the SCB (System control board).

See “2.4 Removing the ribbon cable” and “2.5

Installing the ribbon cable”.

10. Remove the 12 screws [2] (7145) or the 11

screws [3] (7235/7228/7222), and remove the

system control board unit [4].

11. Disconnect the connectors from each motor unit

[1].

12. Remove the 4 screws [2], then remove each

motor unit [3], [4] (7145 only), [5].

13. Reinstall the above parts following the removal

steps in reverse.

[3]

[4]

[2]

[1]

7322ma3002

[2]

[2] [3] [4]

[1]

[2] [3]

7322ma3003

2[1]

[1]

[1] [5]

[2]

[3]

[4]

[3]

DRIVE SECTION

3-5

III DIS./ASSEMBLY

2.2 Replacing the Registration

Clutch

Caution:

• Be sure to remove the drum unit from the

main body before carry out the following pro-

cedure. If the drum unit is in place at this

time, the drum will rotate when you install or

remove the drum rotating plate, resulting in

possible damage to the cleaning blade.

A. Procedure

1. Remove the system control board unit.

• For removal procedure, see “2.1 Removing and

reinstalling the motor units (main, fixing, feed,

developing)”.

2. Remove the set screw [1], and remove the drum

rotating plate [2].

3. Remove the clutch connector [1].

4. Remove the E-ring [2]. Pull the registration

clutch [3] toward you and rotate it to remove.

[1]

[2]

[1]

[2]

[3]

DRIVE SECTION

3-6

III DIS./ASSEMBLY

5. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the registration clutch [1], be sure

to set the groove of the clutch detent in the stop-

per [3].

2.3 Replacing the Loop Clutch

A. Procedure

1. Remove the system control board unit.

• For removal procedure, see “2.1 Removing and

reinstalling the motor units (main, fixing, feed,

developing)”.

2. Remove the wire bundle from the clamp on the

conveyance drive panel [1].

3. Remove the 2 E-rings [2], 3 screws [3] and 2

bearing [4] , and remove the conveyance drive

panel [1]. (Do not remove the rotation preven-

tion screws on the clutch.)

4. Remove the E-ring [1], then remove the gear [2]

and the connector [3], remove the gear [4] at the

front, and then remove the clutch [5].

5. Reinstall the above parts following the removal

steps in reverse.

[1]

[2][3]

[1]

[2]

[3]

[4]

[1] [2]

[4]

[3]

[5]

DRIVE SECTION

3-7

III DIS./ASSEMBLY

2.4 Removing the Ribbon Cable

A. Procedure

1. Move the lock lever [1] forward to release the

lock, then pull out the ribbon cable [2].

[1]

[2]

DRIVE SECTION

3-8

III DIS./ASSEMBLY

2.5 Reinstalling the Ribbon Cable

A. Procedure

1. Move the lock lever [1] forward, then insert the

ribbon cable [2] firmly into the connector while

ensuring that the conductive face of the ribbon

cable [3] is positioned on the opposite side of

the lock lever.

2. Push back the lock lever [1] to lock the ribbon

cable [2].

[1]

[2]

[3]

[1]

[2]

SCANNER SECTION

3-9

III DIS./ASSEMBLY

3. SCANNER SECTION

3.1 Screws That Must Not be

Removed

Note:

• The paint-locked screws [1] must not be

removed. Be sure that you do not remove these

screws.

In the case of the 7145

In the case of the 7235/7228/7222

[1]

[1] [1]

[1] 7322ma3004

SCANNER SECTION

3-10

III DIS./ASSEMBLY

3.2 Adjusting the Angle of the

Operation Unit

A. Procedure

1. Remove the 2 screws [1].

2. Remove the operating section stopper [2].

3. Remove the 2 screws [3] for each position. And

then install the angle adjustment member [4] in

the specified position.

The angle adjustment member corresponds to 7

degrees for the right position and to 15 degrees

for the left position. However, this is not used for

the setting of 33 degrees.

4. Change the installation direction of the operat-

ing section stopper [2] and set it at the position

for 7 or 15 degrees. However, this is not used

for the setting of 33 degrees.

Note:

• The angle of the operation unit can be adjusted at

the following 3 stages: However, the setting at 33

degrees is available only when combined with the

paper exit tray.

5. Install the operating section stopper [2].

6. Fasten the operation unit [5] with the 2 screws

[1].

[1]

[3]

[4]

[2]

[4]

[3]

[5]

SCANNER SECTION

3-11

III DIS./ASSEMBLY

3.3 Removing the Operating Unit

A. Procedure

1. Open the ADU door [1].

2. Remove the screw [2] and remove the right side

cover /F [3].

3. Remove the 2 angle adjusting screws [1], and

remove the operating section stopper [3] while

lifting up the operating section [2].

[3]

[2] [1]

[2]

[3][1]

SCANNER SECTION

3-12

III DIS./ASSEMBLY

4. Loosen the 2 screws [1] and remove the front

cover [2] and the front door [3].

5. Remove the connector [1].

[1]

[2]

[3]

[1]

SCANNER SECTION

3-13

III DIS./ASSEMBLY

6. Remove the 3 screws [1], and remove the oper-

ating section [2] by pulling it out to this side.

7. Reinstall the above parts following the removal

steps in reverse.

[1]

[2]

SCANNER SECTION

3-14

III DIS./ASSEMBLY

3.4 Removing the Platen Glass/

Slit Glass

When removing the platen glass, execute only the

steps 1, 3, 7, 8 and 9 in the following procedure. For

the slit glass, execute all of the steps 1 to 9.

A. Procedure

1. Open the RADF.

2. Remove the operation unit.

3. Remove the 4 screws [1] and remove the scan-

ner exterior/R [2].

4. Remove the 4 screws [1] and remove the scan-

ner exterior/L [2].

[1]

[2]

[1]

[2]

SCANNER SECTION

3-15

III DIS./ASSEMBLY

5. Remove the 7 screws [1] and remove the scan-

ner exterior/F [2].

[1][2]

[1][1]

[1]

SCANNER SECTION

3-16

III DIS./ASSEMBLY

6. Remove the 2 screws [1] of the slit glass

pressure plate and remove the slit glass [2].

7. Loosen the screw [3] and slide the glass pressure

plate [4] to the paper feed side.

8. Lift up once the platen glass [5]. And then slide it

to the paper feed side to remove it.

Note:

• Be careful not to stain the white reference plate

attached to the back of the scale plate [6] pro-

vided on the paper feed side of the platen glass

[5].

• When the white reference plate gets smudged,

wipe it thoroughly with a clean cloth.

9. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the platen glass [5], be sure to

fasten it securely while pressing the glass pressure

plate [4] to the platen glass [5].

• The slit glass is distinguished between the front

and the rear. Be sure to set the slit glass [2] so

that a black dot on its side comes in the rear right

side when you see the 7145 from the front side.

When attaching the slit glass holding plate with

the 2 screws [1], tighten these screws while

pressing the slit glass [2] onto the original glass

[5] side.

[5]

[1]

[3] [4]

[2] [6]

SCANNER SECTION

3-17

III DIS./ASSEMBLY

3.5 Removing and Reinstalling

the CCD Unit

A. Procedure

1. Remove the platen glass.

2. Remove the 2 screws [1], and remove the photo

sensor fastener [2].

3. Remove the 8 screws [3], and remove the lens

light blocking cover [4].

4. Remove the 3 screws [5], and remove the rib-

bon cable cover [6].

5. Remove the ribbon cable [2] from the ADB (A/D

conversion board) [1].

Note:

• Be careful to avoid damage to the ribbon cable

when removing it. When reinstalling it, be sure

that it is securely in place.

6. Remove the 4 screws [3], and remove the CCD

unit [4].

7. Reinstall the above parts following the removal

steps in reverse.

Note:

• Be sure to perform image adjustment after install-

ing the CCD unit. (See “I Adjustment” section.)

[1]

[2]

[3]

[6]

[5]

[3]

[4]

[1]

[2]

[3][3] [4]

7145ma3052

SCANNER SECTION

3-18

III DIS./ASSEMBLY

3.6 Replacing Exposure Lamp

Caution:

• Do not touch the exposure lamp's lamp area

with bare hands.

A. Procedure

1. Remove the RADF.

• For removing procedure, see the DF service

manual.

2. Remove the platen glass.

3. Remove the 4 screws [1], and remove the read

cover/R [2].

4. Shift the exposure unit [1] to the center of the

main body frame.

5. Remove the 2 screws [2], and remove the auxil-

iary reflecting mirror [3].

6. Remove the 1 connector [1] and 2 screws [2].

Tilt and remove the exposure lamp [3].

7. Reinstall the above parts following the removal

steps in reverse.

[1]

[2]

[1]

[2]

[3]

[1]

[2]

[3]

SCANNER SECTION

3-19

III DIS./ASSEMBLY

3.7 Removing and Reinstalling

the Exposure Unit

A. Removal procedure

1. Remove the RADF.

2. Remove the platen glass.

3. Remove the scanner cover/R.

4. Shift the exposure unit [1] to the center of the

main body frame.

5. The exposure unit [1] is fixed in place by set

screws fastened to the exposure unit mount fit-

tings/F [3], /R [4] (1 screw in each fitting).

Remove the 2 screws [2].

6. Tilt and slide the exposure unit [1] to remove it

from the frame.

7. Disconnect the exposure lamp [5] connector [6].

B. Installation procedure

1. Fit the exposure unit into the main body.

2. Insert the front exposure unit mount fitting/F [2],

/R [3] into the corresponding slits in the expo-

sure unit.

3. Shift the V mirror unit [4] to the exit side.

Through the front, insert the two optics unit posi-

tioning jig [5] so that they are at the installation

location for the exposure unit. Pass the jig [5]

through the V mirror unit [4] to fasten it in place.

Position the exposure unit [1] by pushing it

against the frame on the right side of the unit.

Note:

• Be sure to the use optics unit positioning jig when

reinstalling the exposure unit.

4. Fasten the exposure unit mount fittings/F, /R

into place (1 screw in each fitting).

5. Remove the optics unit positioning jig.

6. Finish installation by reversing the sequence of

the removal procedure.

[1]

[2]

[3]

[6]

[5]

[4]

[1]

[2]

[3]

[4]

[5]

SCANNER SECTION

3-20

III DIS./ASSEMBLY

3.8 Removing the Optics Wire

A. Procedure

1. Remove the RADF.

2. Remove the platen glass.

3. Remove the scanner cover/R.

4. Shift the V mirror unit [1] to the paper exit side.

Through the front, insert the optics unit position-

ing jig so that it is at the V mirror attachment

location. Pass the jig through the V mirror unit

[1] to fasten the it in place.

5. Remove the exposure unit [2].

6. Detach the nuts [5] and washers [6] from the

ends of the optical wires/F [3], /R [4], and

remove the wires/F [3], /R [4].

7. Remove the screws [7] holding the two drive

pulley [8] bearings in place (two screws on each

pulley), and remove the bearings [9].

8. Remove the optical wires/F [3], /R [4] from the

drive pulleys.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

SCANNER SECTION

3-21

III DIS./ASSEMBLY

3.9 Installing the Optics Wire

A. Procedure

1. Loosen the set screw of the drive pulley [1] on

one side so that the drive pulley can rotate

freely against the pulley shaft.

2. Fit the metal ball [3] (midway along each optical

wire [2]) into the mount opening on the drive pul-

ley [1]. Starting from this position, wind 6 times

[4] around the outside and 5 times [5] around

the inside.

• Use the “F” exposure unit mount fitting (the fitting

with the “F” printed on it) at the front, and use the

“R” fitting at the rear.

• The end with the metal ball [7] at the tip winds

around the inside of the pulley shaft [8].

• Wind so that the two ends of the wire come off

the top of the pulley.

3. After winding the wires [1], fasten them in place

(with tape [6], etc.) so that they cannot come off.

Note:

• When winding wire around pulleys, be sure that

the winds are close. Be careful to avoid overlap.

• When changing the wire, be sure to use the

optics unit positioning jig.

4. On the metal ball [1] side, pass the optical wire

[2] so that it passes under the V mirror unit [3],

through the paper exit side pulley [4], and

through the inside pulley [5] on the V mirror unit.

Hook the end of the wire onto the notch [6] on

the frame.

5. On the right side, pass the wire so that it passes

through the right side pulley [7], passes over the

pulley [8] on the outside of the V mirror unit, and

passes under the V mirror unit. Fasten the end

to the right side frame with the nut [9] and

washer [10].

[2]

[3]

[1]

[4]

[5]

[6]

[7]

[8]

[2]

[3]

[1] [4] [5] [7]

[8]

[3]

[8]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

SCANNER SECTION

3-22

III DIS./ASSEMBLY

6. Position the V-mirror unit by using the optics unit

positioning jig.

7. After temporary fastening, use a spring balancer

to apply 1.3 ~ 1.7kg of tension to the front and

rear optical wires in the arrow direction, then

fully tighten the nuts [1].

8. Fasten the set screw of the drive pulley which

has been loosened.

9. Using the optics unit positioning jig to install the

exposure unit.

10. Remove the optics unit positioning jig.

11. Slide the exposure unit two or three times to

make sure that it works correctly.

12. Finish installation by reversing the sequence of

the removal procedure.

[1]

WRITE UNIT

3-23

III DIS./ASSEMBLY

4. WRITE UNIT

4.1 Removing and Reinstalling

the Write Unit

Warning:

• Never supply power while the write unit is

out of its proper installed position.

• Do not open the cover of the write unit while

power is being supplied. Shining of the laser

beam on the eye may cause blindness.

Note:

• When removing the write unit, take care to avoid

touching with the write mirror and the dust proof

glass. (Touching these areas may leave

scratches and smudges.)

• When installing the write unit, confirm that the

PET sheet at the end is seated correctly in the

duct.

• After turning the main power switch OFF, wait at

least two minutes before removing the write unit.

A. Procedure

1. Open the front door and remove the developing

unit and the drum unit.

2. Remove the exit tray.

3. Remove the front door.

4. Remove the main body cover/FR [1], the main

body cover/FL [2], the side cover/R [3], the fil-

ter cover assembly [4], the main body cover/U

[5] and the main body assist cover [6].

[2]

[3]

[5]

[4]

[6]

[1]

WRITE UNIT

3-24

III DIS./ASSEMBLY

5. Remove the write cleaning knob [2] from the

dust proof glass cleaning rod [1] and then puch

the rod [1] to inside of main body.

6. Remove the 11 screws [1], and remove the write

cover [2].

7. Remove the two write unit mount pieces [2]

(each is held in place by screw [1]).

[1] [2]

[1]

[2]

[1]

[2]

WRITE UNIT

3-25

III DIS./ASSEMBLY

8. Disconnect the 3 connectors [1] .

9. Remove the air duct [2].

10. Remove the 3 screws [3] (SEMS II: long

screws), and remove the write unit [4] by pulling

it to the paper exit side.

Note:

• When removing the write unit, take care to avoid

touching with the write mirror and the dust proof

glass.

In the case of the 7145

In the case of the 7235/7228/7222

[1]

[2]

[3] [4]

[1]

[3]

[1] [2]

[4]

7322ma3005

WRITE UNIT

3-26

III DIS./ASSEMBLY

11. Reinstall the above parts following the removal

steps in reverse.

Note:

• Reinstall the write unit while inserting the front

edge of the cooling air guide sheet [1] into the

specified position.

[1]

DRUM UNIT

3-27

III DIS./ASSEMBLY

5. DRUM UNIT

5.1 Removing and Reinstalling

the Drum Unit

A. Periodically replaced parts/cycle

• Drum unit: Every 720,000 copies (7145)

• Drum unit: Every 600,000 copies (7235/7228/

7222)

B. Procedure

1. Remove the developing unit.

2. Open the ADU door [1], and open the convey-

ance unit [2].

3. Loosen the screw [3], and gently pull the drum

unit [4] out toward you until it stops. Then tilt it

slightly and remove it.

Note:

• When removing the drum unit, be sure to hold it

at both ends to prevent a possible deformation of

the drum unit.

• After removing the drum unit, close the drum

cover and store the unit in a dark place.

• During removal and reinstallation work, never

rotate the drum in the wrong direction (in the

direction opposite to the direction it moves during

normal copying). Rotating the drum in the reverse

direction may cause scratches to the cleaning

blade.

• When removing the drum unit, do not place your

hand on the separation claw unit [5].

4. Reinstall the above parts following the removal

steps in reverse.

[1]

[2]

[3]

[4]

[5]

DRUM UNIT

3-28

III DIS./ASSEMBLY

5.2 Removing and Reinstalling

the Charging Corona Unit

A. Procedure

1. Remove the drum unit from the main body.

2. Set the unit so the drum is to the top.

3. Remove the cleaning rod's [1] shaft stopper fit-

ting [2], and pull out the cleaning rod [1].

4. Disconnect the connector [3] from the drum unit.

5. Remove the 2 screws [4] (7235/7228/7222

only).

6. Remove the back side (rear side) of the charg-

ing corona unit [5] in the arrow-marked direction

[6] and remove it by sliding in the arrow-marked

direction [7].

7. Reinstall the above parts following the removal

steps in reverse.

Note:

• Be careful not to bend excessively the charging

corona pressure spring.

5.3 Removing and Reinstalling

the Charge Control Plate

A. Procedure

1. Remove the drum unit from the main body.

2. Remove the charging corona unit. Move the

charging cleaning block to its home position (at

the rear side).

3. Remove the 2 charge control springs [1], and

remove the charge control plate [2].

4. To clean: tap lightly with a cloth soaked in drum

cleaner, then use a blower brush to remove

remaining debris.

5. Reinstall the above parts following the removal

steps in reverse.

Note:

• When reinstalling, be sure to set the charge con-

trol plate so that the spring held end is toward the

front of the charging corona unit.

7322ma3006

[1]

[2]

[7]

[6]

[4]

[5]

[3]

[4]

[1]

[2]

DRUM UNIT

3-29

III DIS./ASSEMBLY

5.4 Replacing the Charging Wire

A. Procedure

1. Remove the drum unit from the main body.

2. Remove the charging corona unit. Move the

charging cleaning block to its home position (at

the rear side).

3. Remove the charge control plate.

4. Remove the 2 charging covers (charging cover/F

[1], and charging cover/R [2]).

5. In the case of the 7145

Remove the 2 springs [3], and remove the 2

charging wires [4].

In the case of the 7235/7228/7222

Remove the 2 springs [3], and remove the 1

charging wire [4].

6. To install the replacement wire: first fasten the

rear end of the wire to the unit, then pass the

wire through the charging cleaning block and fix

it in place with the spring. Then complete the

installation by reversing the steps above.

7. Finish installation by reversing the sequence of

the removal procedure.

5.5 Removing and Reinstalling

the Drum

A. Periodically replaced parts/cycle

• Drum: Every 240,000 copies (7145)

• Drum: Every 200,000 copies (7235/7228/7222)

B. Removing procedure

1. Remove the drum unit from the main body.

2. Remove the charging corona unit from the drum

unit.

3. Remove the screw [1] and the fixing material [2],

and pull out the drum shaft [3].

When the drum shaft is hard to pull out, knock

lightly at the rear end of the drum shaft.

[1]

[2]

[3]

[4]

[1] [2]

[3]

DRUM UNIT

3-30

III DIS./ASSEMBLY

4. Remove the 2 screws [1], and remove the drum

bearing [2].

5. Remove the 2 semicircular seal blocks [3] (one

on each end of the drum).

6. To remove the drum, lift it up and out from the

front side.

Note:

• Take care to avoid scratching the drum's light

sensitive areas and the cleaning blade. Do not

touch these areas with bare hands.

• When removing or installing, never allow the

drum to bump against the plate-metal part of the

cleaning blade.

• If you are going to place the drum in storage, be

sure to place a cover on the drum (to cut off light

to it) and store it in a dark place.

• When removing the drum unit, do not place your

hand on the separation claw unit.

[1]

[2]

[3]

DRUM UNIT

3-31

III DIS./ASSEMBLY

C. Installing procedure

Note:

• Be sure that the toner collection sheet makes

contact with the entire span of the drum, with no

gaps.

1. Coat the entire surface of the drum with setting

powder.

2. Fit the long convex end [2] of the drum [1] into

the rear side of the unit, then set the drum down

into the unit. Reattach the two seal blocks [3]

(one at each end of the drum).

3. Reattach the drum bearing [4]. Fasten it into

place with the 2 set screws [5].

4. Insert the drum shaft and fasten the hold-down

member [4] with a screw. Be sure to attach the

hold-down member securely as shown in the

drawing right.

[5]

[4]

[1]

[2]

[3]

[4]

[4][4]

OKNG

DRUM UNIT

3-32

III DIS./ASSEMBLY

5. Using the jig [1] included on the drum unit cover,

rotate the drum clockwise and confirm that there

are no gaps in the setting powder coat, and that

the toner collection sheet and cleaning blade

are smooth, etc.

6. Finish installation by reversing the sequence of

the removal procedure.

Note:

• Before installing the drum and cleaning blade

(regardless of whether new or used), be sure to

coat these with setting powder. Apply the powder

around the entire drum, and on both sides of the

blade.

• If you have coated setting powder onto the drum:

Before installing the drum unit back into the main

body, use an alcohol-soaked cloth to remove

stray powder from the sensor surface on the

toner control sensor board. This is necessary to

ensure that accurate toner density readings are

obtained.

• Be sure that the drum is oriented correctly before

installing it. The drum should be positioned so

that the convex end of the longer section comes

at the back.

• After installing a new drum, be sure to reset the

drum-related counters in the 36 mode.

[1]

DRUM UNIT

3-33

III DIS./ASSEMBLY

5.6 Removing and Reinstalling

the Separation Claw

A. Procedure

1. Remove the drum unit from the main body.

2. Remove the drum from the drum unit.

3. Disconnect the relay connector [1].

4. Remove the separation rock spring [2].

5. Remove the 2 positioning screws [3], the 2 col-

lars [4] and the 2 spacer [5], and then remove

the separation claw unit [6].

Note:

• While removing or installing the claw, be careful

to avoid damage to the drum.

6. Pull out the separation fulcrum shaft [2] while

pressing down the claw [1] and remove the 2

separation claws [3].

7. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the claw, be sure that it is cor-

rectly oriented and positioned.

• Do not touch the cleaning blade or the drum's

light sensitive areas with bare hands.

[1]

[2]

[3]

[4]

[5]

[6]

[1]

[2]

[3]

DRUM UNIT

3-34

III DIS./ASSEMBLY

5.7 Removing and Reinstalling

the Transfer and Separation

Corona Unit

A. Periodically replaced parts/cycle

• Transfer corona unit: Every 480,000 copies

(7145)

• Transfer corona unit: Every 400,000 copies

(7235/7228/7222)

B. Procedure

1. Open the ADU door.

2. Pull the conveyance unit [1] toward you to open.

3. Push the rear catch of the transfer/separation

corona unit [2], then remove the unit.

4. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the Transfer/Separation corona

unit, be sure that the cleaning material is in home

position at the rear side.

5.8 Replacing the Transfer and

Separation Wires

Note:

• Do not remove the screw that must not be

removed [2] of the paper entrance guide plate [1].

[1]

[2]

[1]

[2]

DRUM UNIT

3-35

III DIS./ASSEMBLY

A. Procedure

1. Remove the transfer and separation corona unit

from the main body.

2. Use a tweezers to remove the hook [1] from the

transfer and separation corona unit. Then

remove the plunging prevention plate [2].

3. Remove the spark arrestor plates/F [1], /R [2].

4. Move the cleaning block to home position, and

remove the top covers [1] from the cleaning

block.

5. Remove the spring [2] from each wire, and

remove the wires [3].

Note:

• When removing the wire, be careful that the wire

holding rubber that is in touch with the V-shaped

rack [4] does not get lost.

6. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the wire, be sure that the cleaning

block is in home position at the right side. Stretch

the wire so that it fits into the V holders [4].

[1]

[2]

[1]

[2]

[1]

[2]

[3]

[4]

DEVELOPING UNIT

3-36

III DIS./ASSEMBLY

6. DEVELOPING UNIT

6.1 Screws That Must Not be

Removed

Note:

• The 4 screws [1] right must not be removed or

adjusted in the field. Please do not interfere with

these screws.

6.2 Removing and Reinstalling

the Developing Unit

A. Periodically replaced parts/cycle

• Developing unit: Every 720,000 copies (7145)

• Developing unit: Every 600,000 copies (7235/

7228/7222)

B. Procedure

1. Open the front door [1].

2. Loosen the screw [2].

3. Pull the developing unit [3] outward to remove.

4. To reinstall: fit the rails on the bottom of the

developing unit onto the grooves on the main

body, and slide the unit into place.

[1]

[2]

[3]

DEVELOPING UNIT

3-37

III DIS./ASSEMBLY

6.3 Replacing the Developer

A. Periodically replaced parts/cycle

• Developer: Every 240,000 copies (7145)

• Developer: Every 200,000 copies (7235/7228/

7222)

B. Procedure

1. Remove the developing unit from the main body.

2. Release the hooks [1]. Lift the developing unit

cover [2], and remove it.

3. Tilt the developing unit so that the agitator

screws [1] are toward the bottom, and rotate the

agitator input gear [2] counterclockwise as nec-

essary to discharge all developer from within the

developing unit and from the developing sleeve

[3].

4. Wipe away any toner remaining on the develop-

ing regulator plate [4].

5. Pour new developer evenly over the agitator

screws [1].

Note:

• When carrying out replacement, take care to pre-

vent dirt and debris from entering the system.

6. Rotate the agitator input gear [2] 1 counterclock-

wise so that the developer moves into the inside

of the developing unit.

Note:

• After installing new developer, do not turn the

developer-input gear or agitator input gear in the

clockwise (reverse) direction.

[1]

[2]

[1]

[2]

[4]

[3]

[1]

[2]

DEVELOPING UNIT

3-38

III DIS./ASSEMBLY

7. Repeat steps 5 and 6 as necessary to load all of

the developer.

8. Rotate the developing input gear counterclock-

wise and check the bristle height along the

entire surface of the developing sleeve.

9. Reinstall the developing cover while hooking the

cover onto the projection [1]. Be careful to keep

the cover clear of the scatter prevention sheet

[2].

Note:

• After replacing developer, carry out L detection

adjustment before making copies.

[2]

[1]

TONER SUPPLY/CLEANING/RECYCLE UNIT

3-39

III DIS./ASSEMBLY

7. TONER SUPPLY/CLEAN-

ING/RECYCLE UNIT

7.1 Removing and Reinstalling

the Toner Bottle

A. Procedure

1. Open the front door [1], and then open the toner

supply cover [2].

2. Pull the toner bottle [3] slightly out, and turn it

clockwise so that the upper part of the cartridge

aligns with the cutout.

3. Withdraw the toner bottle [3].

4. Reinstall the above parts following the removal

steps in reverse.

7.2 Removing and Reinstalling

the Toner Supply Unit

A. Procedure

1. Remove the drum unit and developing unit.

2. Remove the toner bottle.

3. Remove the rear cover.

4. Remove the system control board unit.

• For removal procedure, see “2.1 Removing and

reinstalling the motor units (main, fixing, feed,

developing)”.

5. Remove the drum rotating plate.

6. Remove the 4 connectors [1].

7. Remove the 4 screws [2], and remove the toner

supply unit [3] by pulling it toward you.

8. Reinstall the above parts following the removal

steps in reverse.

[1]

[2] [3]

[1]

[2]

[3]

TONER SUPPLY/CLEANING/RECYCLE UNIT

3-40

III DIS./ASSEMBLY

7.3 Removing and Reinstalling

the Cleaning Blade

A. Periodically replaced parts/cycle

• Cleaning blade (Cleaning blade assembly):

Every 240,000 copies (7145)

• Cleaning blade (Cleaning blade assembly):

Every 200,000 copies (7235/7228/7222)

B. Procedure

1. Remove the drum unit from the main body.

2. Remove the drum from the drum unit.

3. Remove the 2 screws [1] , and remove the fitting

[2] (suppressor piece) holding the cleaning

blade in place.

4. Remove the cleaning blade [1].

Note:

• Be careful of the cleaning blade edge. Do not

touch the edge with bare hands, and take care to

avoid scratching it.

[1]

[2]

[1]

TONER SUPPLY/CLEANING/RECYCLE UNIT

3-41

III DIS./ASSEMBLY

5. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the cleaning blade [1], install so

that the unit's transparent sheet [2] is oriented as

shown in the diagram.

• Before installing the drum and cleaning blade

(regardless of whether new or used), be sure to

coat these with setting powder. Apply the powder

around the entire drum, and on both sides of the

blade.

• If you have coated setting powder onto the drum:

Before installing the drum unit rear into the main

body, use an drum cleaner cloth to remove stray

powder from the sensor surface on the TCSB

(Toner control sensor board). This is necessary to

ensure that accurate toner density readings are

obtained.

[1]

[2]

PAPER FEED UNIT

3-42

III DIS./ASSEMBLY

8. PAPER FEED UNIT

8.1 Replacing the Paper Feed

Roller and the Feed Roller

(Bypass)

A. Periodically replaced parts/cycle

• Paper feed roller: Every 360,000 copies (Once

for every 100,000 copies for actual durable

count) (7145)

• Paper feed roller: Every 300,000 copies (Once

for every 100,000 copies for actual durable

count) (7235/7228/7222)

• Feed roller: Every 360,000 copies (Once for

every 100,000 copies for actual durable count)

(7145)

• Feed roller: Every 300,000 copies (Once for

every 100,000 copies for actual durable count)

(7235/7228/7222)

B. Procedure

1. Open the bypass tray.

2. Remove the 3 screws [1] and remove the plate

[2].

3. Remove the 2 screws [1], then remove the

bypass sensor.

[1]

[2]

[1]

[2]

PAPER FEED UNIT

3-43

III DIS./ASSEMBLY

4. Remove the stop ring [1] and the bearing [2].

5. Remove the 2 screws [3]. Then slide the bypass

feed roller unit [4] to the left side and remove it

from the bypass drive shaft [5].

6. Remove the paper feed roller [1].

7. Remove the 2 stop rings [2] .

8. Pull out the bypass conveyance shaft [3], and

remove the feed roller [4].

9. Reinstall the above parts following the removal

steps in reverse.

Note:

• When reinstalling rollers, pay attention to their ori-

entation.

[1] [2] [3]

[5]

[4]

[1]

[2]

[3]

[4]

PAPER FEED UNIT

3-44

III DIS./ASSEMBLY

8.2 Replacing the Double Feed

Prevention Roller

A. Periodically replaced parts/cycle

• Double feed prevention roller: Every 360,000

copies (Once for every 100,000 copies for actual

durable count) (7145)

• Double feed prevention roller: Every 300,000

copies (Once for every 100,000 copies for actual

durable count) (7235/7228/7222)

B. Procedure

1. Carry out the steps 1 through to 5 in “8.1

Replacing the paper feed roller and feed roller

(bypass)”.

2. Remove the 2 screws [1], and remove the by-

pass double feed prevention roller unit [2].

3. Remove the 2 springs [1], the two stop rings [2]

and the E ring [3].

4. Pull out the shaft [4] to the side where there is

no E ring provided, and remove the bypass

reverse roller [5] and the roller [6].

5. Reinstall the above parts following the removal

steps in reverse.

Note:

• When reinstalling double feed prevention roller

[5], pay attention to their orientation.

[1]

[2]

7145ma3006

[1]

[2]

[3]

[4]

[5]

[6]

PAPER FEED UNIT

3-45

III DIS./ASSEMBLY

8.3 Replacing the Paper Feed

Rubber and the Feed Rubber

(Tray 1)

A. Periodically replaced parts/cycle

• Paper feed rubber: Every 480,000 copies (Once

for every 200,000 copies for actual durable

count) (7145)

• Paper feed rubber: Every 400,000 copies (Once

for every 200,000 copies for actual durable

count) (7235/7228/7222)

• Feed rubber: Every 480,000 copies (Once for

every 200,000 copies for actual durable count)

(7145)

• Feed rubber: Every 400,000 copies (Once for

every 200,000 copies for actual durable count)

(7235/7228/7222)

B. Procedure

1. Open the ADU door, and then open the convey-

ance unit.

2. Remove the developing unit, the drum unit and

the fixing unit.

3. Slide the upper tray 1 [1] out. Remove the 2

screws [2] holding the tray in place, and take the

tray 1 [1] off.

4. Remove the paper feed roller cover [3] in the

direction of arrow [2] while pushing it in the

direction of arrow [1].

[1]

[2]

[1]

[2]

[3]

PAPER FEED UNIT

3-46

III DIS./ASSEMBLY

5. Remove the 2 stop rings [1] and the bearing [2].

6. Remove the feed shaft [5] from the rocking shaft

[4] while raising the shaft on the left side of the

paper feed roller unit [3], and remove the paper

feed roller unit [3].

7. Remove the collar [1] and pull out the feed shaft

[2].

8. Remove the feed rubber [4] from the feed roller

[3].

9. Remove the stop ring [5] and pull out the paper

feed shaft [6].

10. Remove the paper feed rubber [8] from the

paper feed roller [7].

11. Reinstall the above parts following the removal

steps in reverse.

Note:

• Be sure to install the feed rubber [4] so that the

paint mark [9] is turned in the direction as shown

in the illustration.

• Install the paper feed roller unit so that the hook

of the paper feed roller unit comes above the

paper feed roller unit release arm.

[1] [1]

[2]

[4]

[5]

[3]

[11] [10]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

PAPER FEED UNIT

3-47

III DIS./ASSEMBLY

8.4 Replacing the Double Feed

Prevention Rubber (Tray 1)

A. Periodically replaced parts/cycle

• Double feed prevention rubber: Every 480,000

copies (Once for every 200,000 copies for actual

durable count) (7145)

• Double feed prevention rubber: Every 400,000

copies (Once for every 200,000 copies for actual

durable count) (7235/7228/7222)

B. Procedure

1. Open the ADU door.

2. Slide the tray 1 [1] out. Remove the 2 screws [2]

holding the tray in place, and take the tray 1 [1]

off.

3. Remove the screw [1], and remove the plate [2].

4. Remove the screw [3].

5. With the claws [4] on both ends sandwiched

from the inside of the main body, remove the

double feed prevention roller unit [5].

6. Pull out the lever click shaft [1] while pushing

the lever section [2] of the lever click shaft [1].

7. Remove the double feed prevention rubber [4]

from the double feed prevention roller [3].

[1]

[2]

[1]

[2]

[3]

[4]

[5]

[1]

[2]

[3]

[4]

[5]

PAPER FEED UNIT

3-48

III DIS./ASSEMBLY

8. Reinstall the above parts following the removal

steps in reverse.

Note:

• Be sure to install the double feed prevention rub-

ber so that the paint mark [5] above is turned in

the direction as shown in the illustration.

• When installing the double feed prevention roller

unit [1] to the main body, be sure to align the

upper section of the claw [2] with the center (the

longest scale) of the marking [3] stamped on the

main body frame for leveling.

8.5 Replacing the Paper Feed

Rubber and the Feed Rubber

(Tray 2)

A. Periodically replaced parts/cycle

• Paper feed rubber: Every 480,000 copies (Once

for every 200,000 copies for actual durable

count) (7145)

• Paper feed rubber: Every 400,000 copies (Once

for every 200,000 copies for actual durable

count) (7235/7228/7222)

• Feed rubber: Every 480,000 copies (Once for

every 200,000 copies for actual durable count)

(7145)

• Feed rubber: Every 400,000 copies (Once for

every 200,000 copies for actual durable count)

(7235/7228/7222)

B. Procedure

1. Open the ADU door.

2. Remove the screw [1], and remove the plate [2].

[1]

[2]

[3]

[1]

[2]

PAPER FEED UNIT

3-49

III DIS./ASSEMBLY

3. Remove the 2 stop rings [1] and the bearing [2]

on this side, and remove the paper feed roller

unit [4] by sliding the bearing [3] on the rear side

to the rear.

4. Remove the collar [1] and pull out the feed shaft

[2].

5. Remove the feed rubber [4] from the feed roller

[3].

6. Remove the stop ring [5] and pull out the paper

feed shaft [6].

7. Remove the paper feed rubber [8] from the

paper feed roller [7].

8. Reinstall the above parts following the removal

steps in reverse.

Note:

• Be sure to install the feed rubber [4] so that the

paint mark [9] is turned in the direction as shown

in the illustration.

• Install the paper feed roller unit so that the hook

of the paper feed roller unit comes above the

paper feed roller unit release arm.

[1] [1]

[2]

[3]

[4]

[11] [10]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

PAPER FEED UNIT

3-50

III DIS./ASSEMBLY

8.6 Replacing the Double Feed

Prevention Rubber (Tray 2)

A. Periodically replaced parts/cycle

• Double feed prevention rubber: Every 480,000

copies (Once for every 200,000 copies for actual

durable count) (7145)

• Double feed prevention rubber: Every 400,000

copies (Once for every 200,000 copies for actual

durable count) (7235/7228/7222)

B. Procedure

1. Open the ADU door.

2. Slide the tray 2 [1] out. Remove the 2 screws [2]

holding the tray in place, and take the tray 2 [1]

off.

3. Open the guide plate [1], and remove the set

screw [2].

4. With the claws [3] on both ends sandwiched

from the inside of the main body, remove the

double feed prevention roller unit [4].

5. While pressing on the lever [2] on the lever click

shaft [1], pull out the lever click shaft [1].

6. Remove the double feed prevention rubber [4]

from the roller [3].

[1]

[2]

[1]

[2]

[3]

[4]

[1]

[2]

[3]

[4]

[5]

PAPER FEED UNIT

3-51

III DIS./ASSEMBLY

7. Reinstall the above parts following the removal

steps in reverse.

Note:

• Be sure to install the double feed prevention rub-

ber so that the paint mark [5] above is turned in

the direction as shown in the illustration.

• When installing the double feed prevention roller

unit [1] to the main body, be sure to align the

upper section of the claw [2] with the center (the

longest scale) of the marking [3] stamped on the

main body frame for leveling.

8.7 Cleaning the Paper Dust

Removing Brush

1. Open the ADU door, and then open the convey-

ance unit.

2. Remove the developing unit and the drum unit.

3. Release the catch of the claw [3] while lifting up

slightly the lower section on this side [2] of the

paper dust removing brush [1], and remove the

paper dust removing brush [1] in the arrow-

marked direction.

Note:

• Do not bend the metal plate of the paper dust

removing brush [1].

4. Clean the PET sheet [1] and the plastic part [2]

using a cleaning pad and a blower brush.

A. Installation procedure

1. Insert the paper dust removing brush [1] from

the rear side [2], and confirm that the hole [3] in

the brush [1] is engaged with the claw [4].

2. Finish installation by reversing the sequence of

the removal procedure.

[1]

[2]

[3]

[2]

[3]

[1]

[2]

[1]

[2] [3]

[4]

FIXING UNIT

3-52

III DIS./ASSEMBLY

9. FIXING UNIT

9.1 Removing and Reinstalling

the Fixing Unit

Caution:

• The fixing unit remains extremely hot imme-

diately after power is switched OFF. To avoid

injury from burns, do not begin work until the

fixing unit has cooled down sufficiently.

• When installing the fixing unit, be sure to

firmly tighten the unit's 2 set screws.

A. Procedure

1. Open the ADU door [1] and the conveyance unit

[2], and loosen the 2 screws [4] holding the fix-

ing unit [3] in place.

2. Pull the fixing unit out toward you and remove it.

Note:

• Do not touch the areas shown in the diagram right

when attaching or removing the fixing unit.

• Observe care, as force applied to the fixing claw

and paper exit guide may result in the rollers

being scratched.

3. Reinstall the above parts following the removal

steps in reverse.

[1]

[2] [3]

[4]

FIXING UNIT

3-53

III DIS./ASSEMBLY

9.2 Replacing the Fixing Heater

Lamp/1 and Lamp/2

Caution:

• Do not touch the lamp area with bare hands.

A. Periodically replaced parts/cycle

• Fixing heater lamp/1: Every 480,000 copies

(7145 only)

• Fixing heater lamp/2: Every 480,000 copies

(7145 only)

B. Procedure

1. Remove the fixing unit from the main body.

2. Remove the screws [1], and remove the 2 cov-

ers/F [2], /R [3].

3. Detach the faston terminal [1] at the rear of each

lamp.

Note:

• The marking “B” is stamped on the hole of the

lamp support piece for the L3 (Fixing heater lamp

/3) [2].

[1]

[2]

[3]

[1]

[2]

FIXING UNIT

3-54

III DIS./ASSEMBLY

4. Detach the faston terminal [1] at the front of

each lamp.

5. Remove the 2 screws [2], and remove the lamp

support piece/F [3].

6. Keeping all cord faston terminal wiring straight,

pull each fixing heater lamp/1 [4], /2 [5] toward

you to remove.

7. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing, be sure that manufacturer's mark

is mounted on the front side.

• Do not allow the heater lamps to make contact

with the inside of the roller.

• Install so that the main lamp is at the top, and the

sub lamp is at the bottom.

Heater cords are color-coded as follows.

• When installing the faston terminal on the drive

gear side, be sure that the installation position is

correct.

Lamp

Color Positions

JAPAN U.S.A. EUROPE

OTHERS

Front Rear Front Rear Front Rear

Main White White Red Red Blue Blue

Sub White Black Red Black Blue Black

[1]

[2]

[3]

[4]

[5]

FIXING UNIT

3-55

III DIS./ASSEMBLY

9.3 Removing and Reinstalling

the Fixing Claw

A. Periodically replaced parts/cycle

• Fixing claw: Every 240,000 copies (7145)

• Fixing claw: Every 200,000 copies (7235/7228/

7222)

B. Procedure

1. Remove the fixing unit from the main body.

2. Remove the 2 covers/F, /R.

3. Open the fixing guide [1].

4. Remove the 2 set screws [2], and remove the

fixing paper exit board/U [3].

5. Remove the 3 screws [4] from the fixing paper

exit board/U, and remove the fixing claw unit [5].

6. Unhook the spring [1] of the fixing claw unit, and

remove the fixing claw [2].

7. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the fixing claw, be sure that it is

oriented correctly.

• Be sure that the claw is securely attached to the

claw spring.

• When installing the fixing paper exit board/U to

the fixing unit, be careful not to damage the fixing

roller with the fixing claw.

[1]

[2]

[3]

[5]

[4]

[1]

[2]

FIXING UNIT

3-56

III DIS./ASSEMBLY

9.4 Replacing the Fixing Web

A. Periodically replaced parts/cycle

• Fixing web (Fixing cleaner assembly) : Every

240,000 copies (7145)

• Fixing web (Fixing cleaner assembly) : Every

200,000 copies (7235/7228/7222)

B. Procedure

1. Remove the fixing unit from the main body.

2. Remove the front cover and the rear cover of

the fixing unit.

3. Remove the fixing paper exit board/U.

4. Remove the 6 screws [1] and remove the fixing

web [2].

[1]

[2]

FIXING UNIT

3-57

III DIS./ASSEMBLY

5. Reinstall the above parts following the removal

steps in reverse.

Note:

• When replacing the fixing web, be sure to rotate

the web drive gear [5] to wind up the edge in blue

line [1] of the fixing web until it comes between 0

and 10mm from the nip section [4] of the fixing

heating roller [2] and the fixing cleaning roller [3].

On this occasion, be sure to check the web wind-

ing shaft [6] if it is also rotating.

[5]

[1]

[2]

[3]

[4]

[6]

FIXING UNIT

3-58

III DIS./ASSEMBLY

• When installing the fixing claw unit, be careful

that the edge of the fixing claw pressing spring [1]

does not run on the web case.

[1]

FIXING UNIT

3-59

III DIS./ASSEMBLY

9.5 Removing/Reinstalling the

Fixing Heat Roller, Fixing

Pressure Roller, Heat Insulat-

ing Sleeve/A, /B, Fixing

Idling gear /B, Fixing Bearing

/U, /L, Heater Lamp/1, /2

A. Periodically replaced parts/cycle

• Fixing heat roller: Every 120,000 copies (7145)

• Fixing heat roller: Every 200,000 copies (7235/

7228/7222)

• Fixing pressure roller: Every 120,000 copies

(7145)

• Fixing pressure roller: Every 200,000 copies

(7235/7228/7222)

• Heat insulating sleeve/A: Every 120,000 copies

(7145)

• Heat insulating sleeve/A: Every 200,000 copies

(7235/7228/7222)

• Heat insulating sleeve/B: Every 120,000 copies

(7145)

• Heat insulating sleeve/B: Every 200,000 copies

(7235/7228/7222)

• Fixing idling gear/B: Every 120,000 copies

(7145)

• Fixing idling gear/B: Every 200,000 copies

(7235/7228/7222)

• Fixing bearing /U: Every 240,000 copies (7145)

• Fixing bearing/U: Every 200,000 copies (7235/

7228/7222)

• Fixing bearing/L: Every 240,000 copies (7145)

• Fixing bearing/L: Every 200,000 copies (7235/

7228/7222)

• Fixing heater lamp/1: Every 480,000 copies

(7145 only)

• Fixing heater lamp/2: Every 480,000 copies

(7145 only)

FIXING UNIT

3-60

III DIS./ASSEMBLY

B. Procedure

1. Remove the fixing unit from the main body.

2. Remove the fixing claw unit.

3. Remove the fixing web.

4. Remove the two fixing heater lamps.

5. Remove the 2 screws [2] and 2 collars [3] for the

connector [1] that was connected to the faston

terminal. Remove the connector [1].

6. Remove the 2 screws [4], and remove the lamp

support piece/R [5].

7. Open the fixing guide [1] to release the pres-

sure.

8. Remove the C-ring [3] at the rear of the heat

roller [2], and then remove the gear [4] and heat

insulating sleeve/A [5], /B [6].

9. Remove another C-ring [1], then remove the

heat insulating sleeve A [2] (the sleeve toward

the front).

10. Remove the 2 fixing bearings/U [4] (one at the

front, one at the rear) from the fixing unit.

11. Remove the fixing heat roller [3].

Note:

• When the installation, be sure that heat insulating

sleeves A and B are oriented and positioned cor-

rectly.

When replacing the heating insulating sleve/A [5],

apply solvest 240 [7] to the inside and outside

surfaces of the heat insulation sleeve/A [5] and

then install it.

[1]

[2]

[3]

[4]

[5]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[2]

[3]

[1]

[4]

FIXING UNIT

3-61

III DIS./ASSEMBLY

12. After removing the fixing pressure roller [1],

remove the E-ring at both sides and then

remove the 2 fixing bearings/U [2].

13. In the case of the 7145

Remove the E-ring, and then remove the fixing

idling gear/B [4] and gear [3].

Note:

• When replacing the fixing idling gear/B [4], clean

the gear shaft with a drum cleaner.

In the case of the 7235/7228/7222

Remove a screw [1] and then remove the shaft

fixing plate caulking [2].

Remove the fixing idling gear/B [3] from the

shaft section of shaft fixing plate caulking [2].

Note:

• When replacing the fixing idling gear/B [3] with a

new one, clean the shaft section of the shaft fixing

plate caulking [2] with drum cleaner.

14. Reinstall the above parts following the removal

steps in reverse.

[1]

[2][4]

[2]

[3]

7145ma3106

[4]

[3]

[3][2]

[1]

[2]

7322ma3007

FIXING UNIT

3-62

III DIS./ASSEMBLY

Note:

• When returning the fixing web in use, be sure to

rotate the web drive gear [2] until the original web

winding shaft [1] starts to turn.

• When returning the wiring harness, be sure to

hook the wiring harness securely on the wiring

harness holder section [1] so that it does not

interfere with the web operation lever [2].

[1]

[2]

[1] [2]

FIXING UNIT

3-63

III DIS./ASSEMBLY

• When installing the fixing claw unit, be careful

that the edge of the fixing claw pressing spring [1]

does not run on the web case.

[1]

FIXING UNIT

3-64

III DIS./ASSEMBLY

9.6 Removing and Reinstalling

the Fixing Temperature Sen-

sors

Caution:

• After installing the fixing temperature sen-

sors:

Make sure that the wire bundles are not in

contact with the fixing heat roller.

• Make sure that the sensors them-selves (the

sensor areas) are in contact with the fixing

heat roller.

A. Periodically replaced parts/cycle

• Fixing sensor assembly: Every 480,000 copies

(7145)

• Fixing sensor assembly: Every 400,000 copies

(7235/7228/7222)

B. Procedure

1. Remove the fixing unit from the main body.

2. Remove the fixing claw unit.

3. Remove the fixing web.

4. Remove the connector [1].

5. Remove the 3 screws [2], and remove the fixing

web mounting piece [3].

6. Remove the 2 screws [4], and remove the fixing

sensor assembly [5].

7. Reinstall the above parts following the removal

steps in reverse.

Note:

• The fixing sensor assembly [7] is made up of the

TH1 (fixing temperature sensor/1) and the TH2

(fixing temperature sensor/2). Since the TH1 and

the TH2 have been adjusted at the time of their

assembling, avoid surely loosening the screws.

• Make sure that the sensors are in contact with the

heat roller.

[1]

[7]

[2] [3]

[4] [5] [6] [4]

FIXING UNIT

3-65

III DIS./ASSEMBLY

• When returning the fixing web in use, be sure to

rotate the web drive gear until the original web

winding shaft [1] starts to turn.

• When installing the fixing claw unit, be careful

that the edge of the fixing claw pressing spring [1]

does not run on the web case.

[1]

FIXING UNIT

3-66

III DIS./ASSEMBLY

9.7 Removing and Reinstalling

the Fuse Mounting Plate

Assembly

Caution:

• This is an important safety part. (P/N:SP00-

0110) Be sure to observe the following cau-

tions and steps when removing or reinstall-

ing.

Caution:

• After installing the thermostat:

Make sure that the wire bundle is not in con-

tact with the fixing heat roller.

• Make sure that the thermostat itself is in con-

tact with the fixing heat roller.

A. Periodically replaced parts/cycle

• Fuse mounting plate assembly: Every 480,000

copies (7145)

• Fuse mounting plate assembly: Every 400,000

copies (7235/7228/7222)

B. Procedure

1. Remove the fixing unit from the main body.

2. Remove the fixing claw unit.

3. Remove the fixing web.

4. Remove the heat roller.

5. Remove the fixing web mounting piece.

6. Detach the thermostat [1] 2 Faston terminals [2].

7. Remove the 2 screws [3], and remove the Fuse

mounting plate assembly [4].

8. Reinstall the above parts following the removal

steps in reverse.

Note:

• When installing the fuse mounting plate assem-

bly, with the base plate sandwiched between the

unit’s sheet materials, fasten it with the screw

while attaching it to the bottom side.

• When connecting the Faston terminals of the

thermostat [1], be careful not to deform the plate

spring section. Be careful not to mix up the front

with the back of the Faston terminal.

[1]

[2]

[3]

[4]

FIXING UNIT

3-67

III DIS./ASSEMBLY

• When returning the fixing web in use, be sure to

rotate the web drive gear until the original web

winding shaft [1] starts to turn after the assem-

bling.

• When installing the fixing claw unit, be careful

that the edge of the fixing claw pressing spring [1]

does not run on the web case.

[1]

FIXING UNIT

3-68

III DIS./ASSEMBLY

Blank page

SERVICE MANUAL

Models

7145/7222/7228/7235

Service Section

APRIL 2004

KONICA MINOLTA BUSINESS SOLUTIONS U.S.A., INC.

7145/7222/7228/7235

SERVICE MANUAL

APRIL 2004

IMPORTANT NOTICE

Because of the possible hazards to an inexperienced

person servicing this equipment, as well as the risk of

damage to the equipment, Konica Minolta Business

Solutions U.S.A., Inc. strongly recommends that all

servicing be performed by Konica Minolta-trained serv-

ice technicians only.

Changes may have been made to this equipment to

improve its performance after this service manual was

printed. Accordingly, Konica Minolta Business Solutions

U.S.A., Inc., makes no representations or warranties,

either expressed or implied, that the information con-

tained in this service manual is complete or accurate. It

is understood that the user of this manual must assume

all risks or personal injury and/or damage to the equip-

ment while servicing the equipment for which this serv-

ice manual is intended.

Printed in U.S.A.

Corporate Publications Department

CONTENTS

I ADJUSTMENTII ISWIII SERVICEIV DIAGRAMS