SONY B S2 T S Service Manual

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RICOH GROUP COMPANIES

A246/A247/A248

SERVICE MANUAL

PN: RCSMA246

SERVICE MANUAL

A246/A247/A248

RICOH GROUP COMPANIES

A246/A247/A248

SERVICE MANUAL

PN:RCSMA246

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NO PART OF THIS DOCUMENT MAY BE REPRODUCED IN ANY

FASHION AND DISTRIBUTED WITHOUT THE PRIOR

PERMISSION OF RICOH CORPORATION.

All product names, domain names or product illustrations, including desktop images, used in this document are trademarks, registered trademarks or the property of their respective companies.

They are used throughout this book in an informational or editorial fashion only and for the benefit of such companies. No such use, or the use of any trade name, or web site is intended to convey endorsement or other affiliation with Ricoh products.



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WARNING

The Service Manual contains informatio regarding service techniques, procedures, processes and spare parts of office equipmen distributed by Ricoh Corporation. Users of thi manual should be either service trained o certified by successfully completing a Rico Technical Training Program.

Untrained and uncertified users utilizin information contained in this service manual t repair or modify Ricoh equipment risk persona injury, damage to property. or loss of warrant protection.

Ricoh Corporation

LEGEND

PRODUCT CODE COMPANY

GESTETNER RICOH SAVIN

A246 2851 FT7950 2050 A247 2860 FT7960 2060 A248 2870 FT7970 2070

DOCUMENTATION HISTORY

REV. NO. DATE COMMENTS

12/98 Original Printing

A246/A247/A248 and A175/A176/A177

Product Comparison Chart

Refer to SM, pg. 2-113 for

After the last sheet of copy paper is stacked

detailed information.

in the duplex tray, the next job will start.

Refer to SM, pg. 2-85/89

for detailed information.

A246G507.WMF

Last sheet

First duplex sheet

The tandem tray (capacity: 500 x 2) is the 1st

tray for (A176/A177/A191/A192 copiers).

SERIES COPIERS.

Duplex copy control has been revised. The

duplex copy productivity has been increased

Duplex copy

productivity

Last sheet

First duplex sheet

in the simplex to duplex mode. Before the

last sheet of copy paper is stacked in the

duplex tray, the next job will start from the

bottom stacked sheet in simplex to duplex

mode.

1st tray for easier paper replenishment.

Tandem LCT The tandem LCT (capacity: 1,550 x 2) is the

1. THE FOLLOWING TABLE SHOWS THE MAJOR DIFFERENCES BETWEEN THE A246/A247/A248 AND A175/A176/A177

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

SM 1 A246/A247/A248

Refer to SM, pg. 2-31/35

for detailed information.

Around 10% of toner is collected to the used

toner collection bottle without transferring the

Refer to SM, pg. 2-65/67

for detailed information.

The A229 (digital copier)

does not have a transfer

belt cleaning blade.

Reason:

If the toner on the transfer

belt were scraped by a

cleaning blade, some of

the normally negatively

charged toner could be

charged positively by

friction.

The positively charged

toner then could not be

removed by the cleaning

bias roller.

A246G500.WMF

toner to the copy paper.

Bias Roller Blade

The toner from the drum cleaning unit and

transfer belt unit is collected and the filtering

Toner re-cycl i n g

system

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

Cleaning Bias Roller

equipment mechanism separates the re-

usable toner and unusable material (blocked

toner and paper dust). The re-usable toner is

returned to the toner tank and the unusable

material is collected in the used toner

collection bottle. About 3% of toner is

collected in the used toner collection bottle.

The estimated period before the toner

collection bottle is full has been extended

from 240 k to 1,500 k copies.

To improve the transfer belt function, a

cleaning bias roller and a bias roller blade

have been added to the transfer belt unit.

Even if the toner is not removed completely

by the transfer belt cleaning blade due to the

paper dust stuck on the transfer belt cleaning

blade, the toner is attracted to the negative

charged cleaning bias roller. The bias roller

blade scrapes off the toner on the cleaning

bias roller.

Transfer belt

cleaning bias

roller

Transfer Belt Cleaning Blade

SM 2 A246/A247/A248

Refer to SM, pg. 2-37 for

detailed information.

Refer to the Operating

Instructions.

The size of the LCD on the operation panel is

320 x 240 dots.

Refer to the Operating

Instructions

The operators have to input 2 actions of the

key operation to enter the UP mode (Clear

Refer to SM, pg. 4-8 and

SP 1-12-1 for detailed

information.

mode key and Clear/Stop key).

Additional original can be set on ADF table

during copying but the copy operation is not

continued

The process control only starts when the

fusing temperature is low. If the main switch

of the copier is not turned off during 24 hours,

the fusing temperature does not go down to

100°C. Process control cannot be carried

out.

To reduce the machine vibration while the

scanner is returning to the home position for

Optics/Scanner

return speed (70

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

70 cpm machines, the appropriate return

speed for each reproduction ratio is adapted

CPM machine)

so that the vibration of the machine is

added for easier access in the UP mode.

table during copying and the copy

operation is continued (totally 100

originals).

operation panel.

widened from 7 to 9. The number of

programs has been increased from 5 to

10. The digits of the user code has been

increased from 6 to 8.

SP mode.

reduced (to the 60 cpm machine level).

operation panel has been enlarged to 640 x

240 dots. For easier key operation, the layout

of the keys has been changed.

A175/A176/A177 machines have been

incorporated to facilitate machine operation.

1) The key top for the UP mode has been

2) Additional or iginals can be set on the ADF

Operation panel For easier operation, the LCD on the

Operation Improvements resulting from experience with

3) A sample copy key is added to the

4) T he range of the ID level has been

5) T he units (inch or mm) can be changed by

The process control auto start mode can be

selected in SP mode (Default: selected). To

maintain optimum copy quality, process

control occurs every 24 hours even if the

main switch is not turned off.

Process control

auto start mode

SM 3 A246/A247/A248

Refer to SM, pg. 2-99 for

detailed information.

Refer to SM, pg. 4-16 for

detailed information.

Developer, Type 9

EDP Code: 887797

Toner, Type 6105

EDP Code: 887801

See illustration. Refer to

SM, pg. 2-21 for detailed

information.

A246G503.WMF

A175/A176/A177A246/A247/A248

When the registration clutch turns on, the

main motor rotation may sometimes be

shocked. Jitter may appear at 80 mm from

the leading edge on small fine dotted images.

It takes longer to deliver severely curled

paper such as recycled paper or paper which

was fed as far as the duplex separation

section in the duplex unit. In latter case, the

paper guide is already up for next sheet of

paper. The paper guide cannot guide the

paper. To solve the problem, a program in

SP mode has been added.

For exit jam removal, it is necessary to open

the sorter stapler door first and then the

copier front door. Also, it is necessary to

close the copier front door first and then the

sorter stapler door.

The PM cycle for replacing developer is every

120 k.

The new type drum can be installed in the

A175/A176/A177 machines.

An independent stepping motor drives the

registration roller to ensure good copy

Drive for the

registration roller

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

speed has increased 1.6 times from the

A177 so that the positioning roller delivers

the paper to the duplex separation section

while the paper guide is down.

changed by SP mode (1-9-1).

quality.

the following modification has been applied.

Duplex To ensure good stacking in the duplex unit,

1) T he duplex positioning roller rotation

2) T he positioning ro ller on timing can be

Operators can open and close either the

Exterior/Front

copier or the sorter stapler door first because

the copier door swing to the right.

doors

New developer is used to stabilize the

triboelectric charge after a long copy run

Developer

(300 k). The new developer maintains the

triboelectric chargeability over a long time.

This reduces the possibility of low image

density or dirty background.

To prevent the drum temperature from

increasing in the continuous duplex mode,

the drum has 12 holes in each drum flange.

Drum

SM 4 A246/A247/A248

See illustration.

The key counter holder is installed at the

copier right rear position.

Refer to SM, pg. 2-91 for

Refer to SM, pg. 3-16/17

for detailed information.

A246G504.WMF

detailed information.

Refer to SM, pg. 4-18 for

detailed information.

Key Counter Holder

When removing misfed paper in the vertical

transport section, it is necessary to open the

upper and lower vertical transport guides.

The open angle of the upper vertical

transport guide is narrower than that of the

lower vertical transport guides.

The key counter holder is installed at the

Key counter

copier right front position for easier operation.

The upper and lower transport guides have

Vertical transport

been combined into one part for easier

operation of jam removal. The open angle of

guide

data can

+300(V)

= V

Thicker, N: Normal, H: Thinner, HH: Much

IDB

Thinner

the upper guide is the same as that of the

lower guide.

Vertical thin line may be thicker than original

after generation copy. Vertical thin lines can

Character Thin

Line Adjustment

be compensated by SP mode (SP1-13-4). L:

be made thinner by lowering the toner

density in the development unit. V

(Generation Copy

Mode)

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

SM 5 A246/A247/A248

See illustration.

When replacing the pressure roller and its

bearings without removing the hot roller, it is

Refer to SM, pg. 5-2 for

detailed information.

Refer to SM, pages 6 1 to

6-9 for details.

A246G501.WMF

Lever

necessary to remove the pressure levers,

retaining rings, and connector bracket.

Retaining Ring

The PM cycle for replacing the pressure roller

is every 240 k.

The Energy Star compliant, US version only. Refer to SM, pg. 2-115 for

To remove the right or the left cover, it is

necessary to remove the other parts (front

cover, rear cover, and inner cover).

The pressure levers securing method has

been changed. The levers are hooked by the

Fusing/Pressure

roller

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

High durability rubber is used for the

pressure roller (450 k).

The European version machine meets the

Energy Star guidelines for energy efficiency

as well as US version machines.

independently. The numbers of screws

required for removing following covers have

been reduced.

Operation panel (-4), Upper cover (-4), Right

upper cover (-4), Lower left & right cover (-2),

shaft and holes, and 2 retaining rings have

been eliminated. Thus, it is not necessary to

remove the connector bracket when

replacing the pressure roller and its bearings

without removing the hot roller.

Retaining Ring

Fusing

Energy star

compliant

Exterior covers The left and right covers can be removed

Lower rear cover (-4)

SM 6 A246/A247/A248

See illustration.

The two types of belt are

not interchangeable. The

two types of duplex unit

are also not interchange-

able because of the

different connectors.

A246G502.WMF

The bias terminal in the development roller

rotates in the bias receptacle. The bias

terminal must be lubricated.

A175/A176/A177

A246/A247/A248

Three separation belts are used for duplex

separation.

The bias terminal (development roller shaft)

does not rotate but the outside of the

Development/Bias

terminal

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

development roller shaft rotates. It is not

necessary to lubricate the development bias

terminal.

lubrication

The number of separation belts has been

reduced from 3 to 1.

Duplex/Separation

belt

SM 7 A246/A247/A248

See illustration.

The drum grounding plate contacts the drum

shaft rotated. Replacement and lubrication

A246G505.WMF

A246G506.WMF

Brush

A246/A247/A248

Brush

Bearing

every 1.2 M are necessary.

Drum Grounding Plate

As the drum grounding terminal, a conductive

brush and a conductive bearing are used. It

Drum grounding

terminal

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

A175/A176/A177

is not necessary to replace these parts at

regular PM.

SM 8 A246/A247/A248

Refer to SM, pg. 9-19/21

for detailed information.

There are 2 solenoids in the grip assembly.

One is used for opening and closing the grip

arms. The other is used for moving the grip

arms. The grip motor is used for moving the

Refer to SM, pg. 4-52 for

detailed information.

grip arms.

The operator can selects 4 staple positions

(top, bottom, slant, 2 staple).

Refer to SM, pg. 9-25 for

detailed information.

The capacity of the punch collection box is as

follows:

7 k sheets (2 holes/sheet) 5 k sheets (3

holes/sheet)

Refer to SM, pg. 9-8 for

In the proof mode the proof exit roller (driving

detailed information.

side) contacts the front side (image side) to

deliver the copy paper.

See Operating

Instruictions

When making more than 20 sets of copies,

operators have to divide the job. The

operator also has to input the settings after

each 20 sets of copies is finished.

is used for opening and closing the grip arms,

Sorter stapler/Grip There are 2 motors in the grip assembly. One

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

instead of solenoids. The other (Grip motor)

is used for moving the grip arms. This reduce

the operation noise in staple mode.

In addition to the 4 staple positions (top,

bottom, slant, 2 staple), the operator can

User

program/Three

select either the 2 or 3 staple position by user

program. When the 3 staple position is

staple position

selected, the indication on the operation

panel will be changed from 2-staple to 3-

staple.

The capacity of the punch waste collection

Sorter

box has been increased.

20 k sheets (2 holes/sheet)/13 k sheets (3

holes/sheet)

stapler/Punch

waste collection

box

For easier operation of the next job or in the

Sorter

platen mode, the original tray is added to the

stapler/Original

top of the proof tray in the sorter stapler.

To ensure good copy quality in proof mode,

the proof exit roller (driving side) contacts the

rear side (non-image side) to deliver the copy

paper.

When making more than 20 sets of copies,

operators just input the number of sets and

press the start key. The operator must then

remove every 20 sets of copies stacked in

the 20 bins. Then reset the originals, and

press the start key again. The operator can

have more than 20 sets of copies.

tray

Sorter

stapler/Proof exit

roller

Sorter

stapler/limitless

sort function:

software

SM 9 A246/A247/A248

Refer to SM, pg. 2-48/49

for detailed information.

There are three reflective type sensors to

detect the original size in platen mode.

Refer to SM, pg. 2-95 for

detailed information.

The APS sensor emits 2 beams (ultra red

light LED) to scan the original size. To

Optics/APS

sensor

No. Section/Item A246/A247/A248 A175/A176/A177 Remarks

distinguish between LT and LG paper sizes,

another APS sensor (usual reflective type) is

installed in the US version.

When the by-pass paper feed key is pressed

twice, the copier enters the thick paper mode.

By-pass tray/Thick

paper mode

In this mode the by-pass feed clutch turns on

twice, the fusing temperature is controlled in

a higher than normal mode, the continuous

copy speed is reduced, and higher transfer

current is applied to the transfer belt.

SM 10 A246/A247/A248

OVERALL INFORMATION

1. OVERALL MACHINE INFORMAT ION........................................ 1-1

1.1 SPECIFICATION...................................................................................... 1-1

1.2 MACHINE CONFIGURATION.................................................................. 1-6

1.2.1 COPIER OVERVIEW....................................................................... 1-6

1.2.2 SYSTEM OVERVIEW...................................................................... 1-6

1.3 COPY PROCESS AROUND THE DRUM................................................. 1-8

1.4 MECHANICAL COMPONENT LAYOUT................................................. 1-10

1.5 DRIVE LAYOUT ..................................................................................... 1-12

1.6 PAPER PATH......................................................................................... 1-13

1.6.1 STANDARD COPYING.................................................................. 1-13

1.6.2 MULTIPLE 2-SIDE COPYING....................................................... 1-14

1.7 ELECTRICAL COMPONENT DESCRIPTION........................................ 1-15

DETAILED DESCRIPTIONS

2. DETAILED SECTION DESCRIPTIONS.......................................2-1

2.1 PROCESS CONTROL.............................................................................. 2-1

2.1.1 OVERVIEW ..................................................................................... 2-1

2.1.2 PROCESS CONTROL DATA INITIAL SETTING............................. 2-4

2.1.3 LATENT IMAGE CONTROL............................................................ 2-5

2.1.4 IMAGE DENSITY CONTROL........................................................ 2-12

2.2 DRUM UNIT............................................................................................ 2-18

2.2.1 OVERVIEW ................................................................................... 2-18

2.2.2 OPC DRUM CHARACTERISTICS................................................. 2-19

2.2.3 DRUM CHARGE............................................................................ 2-20

2.2.4 ERASE........................................................................................... 2-23

2.2.5 CLEANING..................................................................................... 2-25

2.2.6 QUENCHING................................................................................. 2-30

2.3 DRUM CLEANING AND TONER-RECYCLING...................................... 2-31

2.3.1 TONER TRANSPORT................................................................... 2-31

2.3.2 FILTERING.................................................................................... 2-32

2.3.3 PUMP MECHANISM...................................................................... 2-33

2.3.4 DRIVE MECHANISM..................................................................... 2-34

2.3.5 TONER COLLECTION BOTTLE.................................................... 2-35

2.4 OPTICS .................................................................................................. 2-36

2.4.1 OVERVIEW ................................................................................... 2-36

2.4.2 SCANNER DRIVE ......................................................................... 2-37

2.4.3 VERTICAL LENS DRIVE............................................................... 2-38

2.4.4 HORIZONTAL LENS DRIVE.......................................................... 2-39

2.4.5 HORIZONTAL LENS POSITIONING............................................. 2-40

2.4.6 3RD SCANNER DRIVE................................................................. 2-42

SM i A246/A247/A248

2.4.7 OPTICS CONTROL CIRCUIT........................................................ 2-43

2.4.8 AUTOMATIC IMAGE DENSITY CONTROL SYSTEM (ADS)........ 2-44

2.4.9 MANUAL IMAGE DENSITY CONTROL ........................................ 2-46

2.4.10 UNEVEN LIGHT INTENSITY CORRECTION.............................. 2-47

2.4.11 ORIGINAL SIZE DETECTION IN PLATEN MODE...................... 2-48

2.4.12 HALF TONE MODE..................................................................... 2-50

2.5 DEVELOPMENT..................................................................................... 2-51

2.5.1 OVERVIEW ................................................................................... 2-51

2.1.2 DEVELOPMENT MECHANISM..................................................... 2-52

2.1.3 DRIVE MECHANISM..................................................................... 2-53

2.1.4 CROSSMIXING ............................................................................. 2-54

2.1.5 DEVELOPMENT BIAS................................................................... 2-55

2.1.6 TONER SUPPLY........................................................................... 2-60

2.6 IMAGE TRANSFER................................................................................ 2-64

2.6.1 PRE-TRANSFER LAMP................................................................ 2-64

2.6.2 IMAGE TRANSFER AND PAPER SEPARATION OVERVIEW..... 2-65

2.6.3 IMAGE TRANSFER AND PAPER SEPARATION MECHANISM... 2-66

2.6.4 TRANSFER BELT UNIT LIFT MECHANISM................................. 2-68

2.6.5 PAPER TRANSPORTATION AND BELT DRIVE MECHANISM....2-69

2.6.6 TRANSFER BELT CLEANING MECHANISM................................ 2-70

2.6.7 TONER COLLECTION MECHANISM............................................ 2-71

2.6.8 TRANSFER ANTI-CONDENSATION HEATER............................. 2-72

2.7 PAPER FEED......................................................................................... 2-73

2.7.1 OVERVIEW ................................................................................... 2-73

2.7.2 FRR FEED SYSTEM..................................................................... 2-74

2.7.3 SLIP CLUTCH MECHANISM......................................................... 2-76

2.7.4 FRR FEED DRIVE MECHANISM.................................................. 2-77

2.7.5 SEPARATION ROLLER RELEASE MECHANISM........................ 2-79

2.7.6 PAPER RETURN MECHANISM.................................................... 2-80

2.7.7 PAPER SKEW PREVENTION MECHANISM................................ 2-81

2.7.8 PAPER LIFT MECHANISM............................................................ 2-82

2.7.9 PAPER NEAR END/PAPER END DETECTION............................ 2-85

2.7.10 TANDEM FEED TRAY................................................................. 2-86

2.7.11 PAPER SIZE DETECTION.......................................................... 2-90

2.7.12 VERTICAL TRANSPORT MECHANISM ..................................... 2-91

2.7.13 TRAY POSITIONING MECHANISM............................................ 2-92

2.7.14 BY-PASS FEED TABLE .............................................................. 2-95

2.7.15 PAPER REGISTRATION............................................................. 2-98

2.7.16 REGISTRATION DRIVE MECHANISM....................................... 2-99

2.7.17 GUIDE PLATE RELEASE MECHANISM................................... 2-100

2.8 IMAGE FUSING.................................................................................... 2-101

2.8.1 OVERVIEW ................................................................................. 2-101

2.8.2 FUSING ENTRANCE GUIDE...................................................... 2-102

2.8.3 FUSING DRIVE MECHANISM..................................................... 2-103

2.8.4 FUSING LAMP CONTROL.......................................................... 2-104

2.8.5 INVERTER AND PAPER EXIT.................................................... 2-105

2.8.6 INVERTER AND EXIT DRIVE MECHANISM............................... 2-106

2.9 DUPLEX ............................................................................................... 2-107

2.9.1 OVERVIEW ................................................................................. 2-107

A246/A247/A248 ii SM

2.9.2 DRIVE MECHANISM................................................................... 2-108

2.9.3 DUPLEX ENTRANCE TO DUPLEX TRAY.................................. 2-109

2.9.4 DUPLEX STACKING................................................................... 2-110

2.9.5 DUPLEX PICK-UP ROLLER MECHANISM................................. 2-111

2.9.6 DUPLEX PAPER FEED............................................................... 2-112

2.10 ENERGY STAR COMPLIANT MACHINES

(ALL THE DESTIMATIONS)............................................................... 2-115

2.11 ENERGY SAVING INFORMATION.................................................... 2-117

2.11.1 ABOUT THE ENERGY SAVING FE ATURES OF

THIS COPIER............................................................................ 2-117

INSTALLATION

3. INSTALLATION PROCEDURE................................................... 3-1

3.1 INSTALLATION REQUIREMENTS .......................................................... 3-1

3.1.1 ENVIRONMENT .............................................................................. 3-1

3.1.2 MACHINE LEVEL............................................................................ 3-1

3.1.3 MINIMUM SPACE REQUIREMENTS.............................................. 3-2

3.1.4 POWER REQUIREMENTS.............................................................. 3-2

3.2 COPIER (A246/A247/A248)...................................................................... 3-3

3.2.1 ACCESSORY CHECK..................................................................... 3-3

3.2.2 INSTALLATION PROCEDURE........................................................ 3-4

3.2.3 GUIDANCE ROM INSTALLATION

(OPTION: EUROPE VERSION ONLY)......................................... 3-14

3.2.4 PLATEN COVER (OPTION) INSTALLATION................................ 3-15

3.2.5 KEY COUNTER HOLDER INSTALLATION (OPTION).................. 3-16

3.2.6 ORIGINAL TRAY INSTALLATION (OPTION)................................ 3-18

3.3 UNIVERSAL TRAY (TRAY 2)................................................................. 3-19

3.4 550 SHEETS PAPER TRAY (TRAY 3)................................................... 3-20

3.5 TANDEM FEED TRAY PAPER SIZE CHANGE (TRAY 1)..................... 3-22

3.6 DUAL JOB FEEDER (A610)................................................................... 3-25

3.6.1 ACCESSORY CHECK................................................................... 3-25

3.6.2 INSTALLATION PROCEDURE...................................................... 3-26

3.7 SORTER STAPLER (A821).................................................................... 3-29

3.7.1 ACCESSORY CHECK................................................................... 3-29

3.7.2 INSTALLATION PROCEDURE...................................................... 3-30

3.7.3 SORTER ADAPTER INSTALLATION (OPTION)........................... 3-34

3.8 20 BIN SORTER STAPLER (A658) (A246 ONLY) ................................. 3-36

3.8.1 ACCESSORY CHECK................................................................... 3-36

3.8.2 INSTALLATION PROCEDURE...................................................... 3-37

3.9 LCT (A822)............................................................................................. 3-41

3.9.1 ACCESSORY CHECK................................................................... 3-41

3.9.2 INSTALLATION PROCEDURE...................................................... 3-42

3.9.3 PAPER SIZE CHANGE ................................................................. 3-46

3.10 TRANSPORTATION REMARKS.......................................................... 3-49

3.10.1 TONER RECYCLING TUBE CLEANING..................................... 3-49

3.10.2 OTHER OPERATIONS................................................................ 3-49

SM iii A246/A247/A248

SERVICE TABLES

4. SERVICE TABLES...................................................................... 4-1

4.1 GENERAL CAUTIONS............................................................................. 4-1

4.1.1 DRUM.............................................................................................. 4-1

4.1.2 DRUM UNIT ..................................................................................... 4-1

4.1.3 CHARGE CORONA......................................................................... 4-2

4.1.4 OPTICS ........................................................................................... 4-2

4.1.5 ERASE LAMP.................................................................................. 4-3

4.1.6 DEVELOPMENT UNIT .................................................................... 4-3

4.1.7 TRANSFER BELT UNIT .................................................................. 4-3

4.1.8 CLEANING SECTION...................................................................... 4-4

4.1.9 PRE-TRANSFER LAMP.................................................................. 4-4

4.1.10 PAPER FEED................................................................................ 4-4

4.1.11 FUSING UNIT................................................................................ 4-4

4.1.12 USED TONER ............................................................................... 4-5

4.2 SERVICE PROGRAM MODE................................................................... 4-6

4.2.1 SERVICE PROGRAM MODE OPERATION.................................... 4-6

4.2.2 SERVICE PROGRAM MODE TABLES........................................... 4-8

4.2.3 INPUT CHECK............................................................................... 4-45

4.2.4 OUTPUT CHECK........................................................................... 4-48

4.3 USER PROGRAM.................................................................................. 4-51

4.3.1 HOW TO ENTER AND EXIT UP MODE........................................ 4-51

4.3.2 UP MODE TABLE.......................................................................... 4-51

4.4 TEST POINTS/DIP SWITCHES/LEDS................................................... 4-53

4.4.1 DIP SWITCHES............................................................................. 4-53

4.4.2 TEST POINTS............................................................................... 4-53

4.4.3 FUSES........................................................................................... 4-54

4.4.4 LEDS ............................................................................................. 4-54

4.5 SPECIAL TOOLS AND LUBRICANTS ................................................... 4-54

4.5.1 SPECIAL TOOLS........................................................................... 4-54

4.5.2 LUBRICANTS................................................................................ 4-54

4.6 TOUCH PANEL DISPLAY POSITION ADJUSTMENT........................... 4-55

PREVENTIVE MAINTENANCE

5. PREVENTIVE MAINTENANCE SCHEDULE...............................5-1

5.1 PM TABLE................................................................................................ 5-1

5.2 PM PROCEDURE .................................................................................... 5-5

5.2.1 CLEARING PM COUNTER.............................................................. 5-5

5.2.2 PM PROCEDURE............................................................................ 5-6

REPLACEMENT AND ADJUSTMENT

6. REPLACEMENT AND AD JUSTMENT........................................ 6-1

6.1 EXTERIOR AND INNER COVER REMOVAL........................................... 6-1

6.1.1 FRONT COVER............................................................................... 6-1

A246/A247/A248 iv SM

6.1.2 REAR SIDE...................................................................................... 6-2

6.1.3 INNER COVER................................................................................ 6-3

6.1.4 RIGHT SIDE.................................................................................... 6-6

6.1.5 LEFT SIDE....................................................................................... 6-7

6.1.6 OPERATION PANEL....................................................................... 6-8

6.1.7 UPPER COVER............................................................................... 6-9

6.2 PAPER FEED......................................................................................... 6-10

6.2.1 PAPER TRAY UNIT REMOVAL.................................................... 6-10

6.2.2 PAPER TRAY REMOVAL.............................................................. 6-13

6.2.3 PAPER FEED ROLLERS REPLACEMENT................................... 6-16

6.2.4 PAPER FEED TIMING ADJUSTMENT.......................................... 6-17

6.2.5 PAPER FEED CLUTCH REMOVAL

(1ST TRAY PAPER FEED CLUTCH)........................................... 6-20

6.2.6 REAR FENCE RETURN SENSOR REPLACEMENT.................... 6-24

6.2.7 REAR FENCE HP SENSOR REPLACEMENT.............................. 6-25

6.2.8 BOTTOM PAPER SENSOR REPLACEMENT............................... 6-26

6.2.9 BY-PASS FEED TABLE REMOVAL.............................................. 6-27

6.2.10 BY-PASS FEED ROLLERS REPLACEMENT ............................. 6-28

6.2.11 BY-PASS PAPER SIZE SE NSOR REPLACEMENT ................... 6-29

6.2.12 BY-PASS FEED CLUTCH AND GUIDE PLATE SOLENOID

REMOVAL................................................................................... 6-31

6.2.13 REGISTRATION MOTOR REMOVAL......................................... 6-33

6.2.14 PAPER DUST CLEANER CLEANING......................................... 6-34

6.2.15 REGISTRATION SENSOR CLEANING....................................... 6-35

6.2.16 UNIVERSAL TRAY SIZE SWITCH REPLACEMENT.................. 6-36

6.2.17 550-SHEET TRAY SET SWITCH REPLACEMENT .................... 6-37

6.2.18 LIFT MOTOR REMOVAL............................................................. 6-38

6.2.19 PAPER FEED MOTOR REMOVAL ............................................. 6-39

6.2.20 COPIER FEED UNIT REMOVAL................................................. 6-40

6.2.21 BOTTOM PLATE LIFT WIRE REPLACEMENT........................... 6-42

6.2.22 550 SHEETS PAPER TRAY (TRAY 3)........................................ 6-44

6.2.23 TANDEM FEED TRAY PAPER SIZE CHANGE.......................... 6-46

6.3 OPTICS .................................................................................................. 6-49

6.3.1 EXPOSURE GLASS REMOVAL.................................................... 6-49

6.3.2 EXPOSURE LAMP REPLACEMENT............................................ 6-50

6.3.3 OPTICS THERMOSWITCH REPLACEMENT............................... 6-52

6.3.4 SCANNER HP SENSOR REPLACEMENT ................................... 6-53

6.3.5 ADS SENSOR REMOVAL............................................................. 6-54

6.3.6 SCANNER DRIVE MOTOR........................................................... 6-55

6.3.7 SCANNER DRIVE WIRES REPLACEMENT................................. 6-56

6.3.8 THIRD SCANNER REMOVAL....................................................... 6-72

6.3.9 THIRD SCANNER DRIVE MOTOR/HP SENSOR

REPLACEMENT............................................................................ 6-73

6.3.10 LENS HORIZONTAL DRIVE HP SENSOR REPLACEMENT...... 6-75

6.3.11 LENS HORIZONTAL DRIVE MOTOR REPLACEMENT ............. 6-77

6.3.12 APS SENSOR ADJUSTMENT (SENSITIVITY DOWN)............... 6-79

6.3.13 ARS SENSOR ADJUSTMENT.................................................... 6-80

6.4 TONER RECYCLING............................................................................. 6-81

6.4.1 TONER RECYCLING UNIT REMOVAL......................................... 6-81

SM v A246/A247/A248

6.4.2 TONER RECYCLING CLUTCH REPLACEMENT......................... 6-82

6.5 DEVELOPMENT AND TONER SUPPLY................................................ 6-83

6.5.1 DEVELOPMENT UNIT REMOVAL................................................ 6-83

6.5.2 DEVELOPER REPLACEMENT..................................................... 6-85

6.5.3 DEVELOPMENT ROLLERS REPLACEMENT .............................. 6-87

6.5.4 TONER DENSITY SENSOR REPLACEMENT.............................. 6-89

6.5.5 TONER BOTTLE DRIVE MOTOR REPLACEMENT..................... 6-90

6.5.6 DEVELOPMENT FILTER AND PRESSURE RELEASE FILTER

REPLACEMENT............................................................................ 6-91

6.5.7 DEVELOPMENT ROLLER SHAFT CLEANING............................. 6-92

6.6 DRUM UNIT............................................................................................ 6-93

6.6.1 DRUM UNIT REMOVAL AND OPC DRUM REPLACEMENT........ 6-93

6.6.2 QUENCHING LAMP REPLACEMENT .......................................... 6-94

6.6.3 GRID PLATE/CHARGE WIRE/WIRE CLEANER

REPLACEMENT............................................................................ 6-95

6.6.4 ERASE LAMP AND DRUM POTENTIAL SENSOR

REPLACEMENT............................................................................ 6-97

6.6.5 CLEANING BLADE REPLACEMENT............................................ 6-98

6.6.6 CLEANING BRUSH REPLACEMENT........................................... 6-99

6.6.7 PICK-OFF PAWL REPLACEMENT............................................. 6-100

6.6.8 OZONE FILTER REPLACEMENT............................................... 6-101

6.6.9 PRE-TRANSFER LAMP REMOVAL............................................ 6-102

6.7 TRANSFER BELT UNIT....................................................................... 6-103

6.7.1 TRANSFER BELT UNIT REMOVAL/INSTALLATION ................. 6-103

6.7.2 TRANSFER BELT REPLACEMENT............................................ 6-105

6.7.3 CLEANING BLADE REPLACEMENT.......................................... 6-107

6.8 FUSING UNIT....................................................................................... 6-108

6.8.1 FUSING UNIT REMOVAL ........................................................... 6-108

6.8.2 FUSING THERMISTOR REPLACEMENT................................... 6-109

6.8.3 FUSING THERMOFUSE REPLACEMENT ................................. 6-110

6.8.4 FUSING LAMP REPLACEMENT................................................. 6-111

6.8.5 OIL SUPPLY/CLEANING ROLLER REPLACEMENT.................. 6-113

6.8.6 OIL SUPPLY CLEANING BRUSH REPLACEMENT................... 6-114

6.8.7 HOT ROLLER REPLACEMENT.................................................. 6-115

6.8.8 PRESSURE ROLLER AND BEARING REPLACEMENT ............ 6-117

6.8.9 FUSING STRIPPER PAWL REPLACEMENT.............................. 6-119

6.8.10 FUSING PRESSURE ADJUSTMENT........................................ 6-120

6.8.11 PAPER EXIT UNIT REMOVAL.................................................. 6-121

6.8.12 EXIT SENSOR AND FUSING EXIT SENSOR

REPLACEMENT........................................................................ 6-123

6.8.13 DUPLEX PAPER GUIDE SENSOR AND DUPLEX

TRANSPORT SENSOR REPLACEMENT................................. 6-124

6.8.14 PRESSURE ROLLER CLEANING ROLLER

REPLACEMENT........................................................................ 6-125

6.9 DUPLEX UNIT...................................................................................... 6-126

6.9.1 FEED ROLLER REPLACEMENT................................................ 6-126

6.9.2 SEPARATION BELT REPLACEMENT........................................ 6-128

6.9.3 DUPLEX UNIT REMOVAL........................................................... 6-131

A246/A247/A248 vi SM

Rev. 10/2000

6.9.4 SEPARATION CLUTCH/TRANSPORT CLUTCH REMOVAL ...... 6-132

6.9.5 JOGGER MOTOR REPLACEMENT ............................................6-133

6.10 COPY QUALITY ADJUSTMENT.........................................................6-138

6.10.1 SP ADJUSTMENT MODE ..........................................................6-138

6.10.2 SIDE-TO-SIDE REGISTRATION ADJUSTMENT.......................6-140

6.10.3 UNEVEN EXPOSURE ADJUSTMENT.......................................6-141

6.10.4 IMAGE DENSITY ADJUSTMENT...............................................6-143

6.10.5 SCANNER HEIGHT ADJUSTMENT...........................................6-144

6.10.6 APS SIZE CALIBRATION...........................................................6-145

6.10.7 FUSING EXIT COVER MAGNET POSITIONING

ADJUSTMENT ...........................................................................6-146

TROUBLESHOOTING

7. TROUBLESHOOTING ................................................................ 7-1

7.1 SERVICE CALL CONDITIONS .................................................................7-1

7.1.1 SUMMARY .......................................................................................7-1

7.1.2 EXPOSURE......................................................................................7-3

7.1.3 SCANNER ........................................................................................7-5

7.1.4 LENS MAGNIFICATION................................................................... 7-8

7.1.5 OPTICS THERMISTOR..................................................................7-10

7.1.6 CHARGE CORONA UNIT ..............................................................7-10

7.1.7 DEVELOPMENT ............................................................................7-11

7.1.8 PROCESS CONTROL SENSORS .................................................7-12

7.1.9 TRANSFER CURRENT..................................................................7-15

7.1.10 DRUM...........................................................................................7-15

7.1.11 PAPER FEED...............................................................................7-16

7.1.12 DUPLEX .......................................................................................7-19

7.1.13 FUSING ........................................................................................7-20

7.1.14 SYSTEM CONTROL ....................................................................7-22

7.1.15 DUAL JOB FEEDER.....................................................................7-23

7.1.16 SORTER STAPLER .....................................................................7-24

7.1.17 OTHERS.......................................................................................7-28

7.2 ELECTRICAL COMPONENT DEFECTS ................................................7-30

7.2.1 SENSORS ......................................................................................7-30

7.2.2 SWITCHES.....................................................................................7-34

7.2.3 FUSES............................................................................................7-35

7.3 FIRMWARE HISTORY ............................................................................7-36

DUAL JOB FEEDER A610

1. OVERALL MACHINE INFORMATION ........................................ 8-1

1.1 SPECIFICATIONS.....................................................................................8-1

1.2 COMPONENT LAYOUT............................................................................8-2

1.2.1 MECHANICAL COMPONENT LAYOUT...........................................8-2

1.2.2 ELECTRICAL COMPONENT LAYOUT............................................8-3

1.3 ELECTRICAL COMPONENT DESCRIPTION...........................................8-4

SM vii A246/A247/A248

2. DETAILED DESCRIPTION..........................................................8-6

2.1 ORIGINAL PICK-UP MECHANISM.......................................................... 8-6

2.2 SEPARATION AND FEED MECHANISM................................................. 8-7

2.3 FRICTION BELT DRIVE MECHANISM.................................................... 8-8

2.4 ORIGINAL SIZE DETECTION.................................................................. 8-9

2.5 TRANSPORT MECHANISM................................................................... 8-11

2.5.1 BASIC OPERATION...................................................................... 8-11

2.5.2 THIN/THICK ORIGINAL MODES................................................... 8-13

2.6 ORIGINAL FEED-OUT MECHANISM..................................................... 8-14

2.7 TRANSPORT BELT LEVELING MECHANISM...................................... 8-15

2.8 LIFT MECHANISM ................................................................................. 8-16

2.9 SPECIAL FEATURES............................................................................. 8-17

2.9.1 PRESET MODE............................................................................. 8-17

2.9.2 TWO-SIDED ORIGINAL FEED (AUTO REVERSE) MODE........... 8-18

2.9.3 COMBINE TWO ORIGINALS MODE............................................. 8-19

2.10 TIMING CHARTS WITH ORIGINAL MISFEED DETECTION............... 8-22

2.10.1 A4 SIDEWAYS: ONE-SIDED, TWO ORIGINALS........................ 8-22

2.10.2 COMBINE TWO ORIGINALS MODE........................................... 8-23

2.10.3 A4 SIDEWAYS: TWO-SIDED, TWO ORIGINALS ....................... 8-24

3. SP MODE.................................................................................. 8-25

3.1 SERVICE TABLES................................................................................. 8-25

3.1.1 DIP SWITCHES AND SWITCH..................................................... 8-25

3.1.2 VARIABLE RESISTORS................................................................ 8-26

3.1.3 LEDS ............................................................................................. 8-26

3.1.4 FUSE............................................................................................. 8-26

4. REPLACEMENTS A ND ADJUSTMENTS................................. 8-27

4.1 UPPER COVER REMOVAL................................................................... 8-27

4.2 TRANSPORT BELT REPLACEMENT.................................................... 8-28

4.3 FEED ROLLER REPLACEMENT........................................................... 8-30

4.4 FRICTION BELT REPLACEMENT......................................................... 8-31

4.5 SENSORS REPLACEMENT .................................................................. 8-32

4.5.1 ORIGINAL SET/FEED, REGISTRATION-1/-2, AND

ORIGINAL WIDTH-1/-2/-3 SENSOR REPLACEMENT.................. 8-32

4.6 FEED-OUT UNIT REMOVAL.................................................................. 8-33

4.7 FEED-OUT MOTOR REPLACEMENT................................................... 8-34

4.8 INVERTER SOLENOID REMOVAL AND ADJUSTMENT...................... 8-35

4.9 FEED-OUT SENSOR REPLACEMENT.................................................. 8-36

4.10 INVERTER ROLLER REPLACEMENT................................................ 8-37

4.11 DF POSITION/APS START SENSOR REPLACEMENT...................... 8-38

4.12 BELT DRIVE MOTOR REPLACEMENT............................................... 8-39

4.13 FEED-IN UNIT REMOVAL.................................................................... 8-40

4.14 FEED-IN MOTOR REPLACEMENT..................................................... 8-41

4.15 FRICTION BELT MOTOR REPLACEMENT......................................... 8-42

4.16 FEED-IN CLUTCH REPLACEMENT.................................................... 8-43

A246/A247/A248 viii SM

4.17 STOPPER SOLENOID REPLACEMENT............................................. 8-44

4.18 VERTICAL REGISTRATION ADJUSTMENT....................................... 8-45

4.18.1 ONE-SIDED THIN ORIGINAL MODE.......................................... 8-45

4.18.2 TWO-SIDED ORIGINAL MODE................................................... 8-47

4.19 SIDE-TO-SIDE REGISTRATION ADJUSTMENT................................. 8-49

4.20 ADJUSTIN PLATE REMOVAL ............................................................. 8-50

4.20.1 PREVENTING THE REAR SIDE OF ORIGINALS FROM

PBECOMING DIRTY................................................................... 8-50

SORTER STAPLER A821

1. OVERALL MAHCINE INFORMA TION ........................................ 9-1

1.1 SPECIFICATIONS.................................................................................... 9-1

1.2 COMPONENT LAYOUT........................................................................... 9-4

1.2.1 MECHANICAL COMPONENT LAYOUT.......................................... 9-4

1.2.2 DRIVE LAYOUT............................................................................... 9-5

1.3 ELECTRICAL COMPONENT DESCRIPTION.......................................... 9-6

2. DETAILED DESCRIPTION..........................................................9-8

2.1 BASIC OPERATION................................................................................. 9-8

2.1.1 NORMAL (PROOF MODE) AND SORT/STACK MODE.................. 9-8

2.1.2 STAPLE MODE............................................................................. 9-11

2.2 TURN GATE SECTION.......................................................................... 9-13

2.3 BIN DRIVE MECHANISM....................................................................... 9-14

2.4 BIN HOME POSITION............................................................................ 9-15

2.5 JOGGER SECTION................................................................................ 9-16

2.6 BIN REAR PLATE DRIVE SECTION...................................................... 9-18

2.7 GRIP ASSEMBLY................................................................................... 9-19

2.7.1 GRIP MOTOR................................................................................ 9-20

2.7.2 GRIP SHIFT MOTOR .................................................................... 9-21

2.8 STAPLE UNIT......................................................................................... 9-22

2.8.1 STAPLE UNIT DRIVE MECHANISM............................................. 9-22

2.8.2 STAPLER ...................................................................................... 9-23

2.8.3 PUNCH MECHANISM................................................................... 9-25

2.8.4 STAPLE UNIT PULLED-OUT MECHANISM................................. 9-26

2.9 JAM DETECTION................................................................................... 9-27

2.10 TIMING CHART.................................................................................... 9-28

2.10.1 SORTER/STAPLER TIMING CHART (PROOF MODE).............. 9-28

2.10.2 SORTER/STAPLER TIMING CHART (STAPLE MODE)............. 9-29

3. SP MODE.................................................................................. 9-30

3.1 SERVICE TABLES (MAIN CONTROL BOARD)..................................... 9-30

3.1.1 DIP SWITCHES............................................................................. 9-30

3.1.2 PUNCH POSITION........................................................................ 9-31

3.1.3 TEST POINTS............................................................................... 9-31

3.1.4 FUSES........................................................................................... 9-31

SM ix A246/A247/A248

4. REPLACEMENTS A ND ADJUSTMENTS................................. 9-32

4.1 EXTERIOR COVER REMOVAL............................................................. 9-32

4.2 STAPLER REMOVAL AND REINSTALLATION..................................... 9-33

4.3 JOGGER PLATE REMOVAL AND INSTALLATIOIN.............................. 9-34

4.4 BINS REMOVAL..................................................................................... 9-35

4.5 MAIN MOTOR REMOVAL...................................................................... 9-39

4.6 GRIP ASSEMBLY REMOVAL................................................................ 9-40

4.7 UPPER GRIP ASSEMBLY REMOVAL................................................... 9-41

4.8 GRIP SHIFT MOTOR REMOVAL........................................................... 9-42

4.9 GRIP MOTOR AND SENSORS REMOVAL........................................... 9-43

4.9.1 GRIP MOTOR/GRIP MOTOR HP SENSOR/

GRIP SHIFT MOTOR HP SENSOR REMOVAL............................ 9-43

4.10 MAIN CONTROL BOARD REPLACEMENT......................................... 9-44

4.11 STAPLE POSITION ADJUSTMENT..................................................... 9-45

4.12 PUNCH POSITION ADJUSTMENT STANDARD................................. 9-46

4.13 HELICAL WHEELS REMOVAL............................................................ 9-47

4.14 PUNCH UNIT REMOVAL..................................................................... 9-52

20-BIN SORTER STAPLER A658

1. OVERALL MACHINE INFORMAT ION...................................... 10-1

1.1 SPECIFICATIONS.................................................................................. 10-1

1.2 COMPONENT LAYOUT......................................................................... 10-2

1.2.1 MECHANICAL COMPONENT LAYOUT........................................ 10-2

1.2.2 DRIVE LAYOUT............................................................................. 10-3

1.2.3 ELECTRICAL COMPONENT DESCRIPTION............................... 10-4

2. DETAILED DESCRIPTION........................................................10-5

2.1 BASIC OPERATION............................................................................... 10-5

2.1.1 NORMAL MODE AND SORT/STACK MODE................................ 10-5

2.1.2 STAPLE MODE............................................................................. 10-7

2.1.3 BIN DRIVE MECHANISM.............................................................. 10-8

2.1.4 BIN HOME POSITION................................................................... 10-9

2.1.5 JOGGER MECHANISM............................................................... 10-10

2.1.6 GRIP ASSEMBLY........................................................................ 10-11

2.1.7 STAPLER UNIT........................................................................... 10-12

2.1.8 STAPLER SWITCH ..................................................................... 10-13

2.1.9 PAPER FEED AND MISFEED DETECTION TIMING.................. 10-14

2.1.10 JAM DETECTION...................................................................... 10-16

3. REPLACEMENT AND ADJUSTEMENT ................................. 10-17

3.1 EXTERIOR COVER REMOVAL........................................................... 10-17

3.1.1 FRONT COVER........................................................................... 10-17

3.1.2 REAR COVER............................................................................. 10-17

A246/A247/A248 x SM

REV. 05/99

3.1.3 TOP COVER.................................................................................10-17

3.1.4 LOWER COVER...........................................................................10-17

3.2 GRIP ARM REPLACEMENT.................................................................10-19

3.3 BIN REMOVAL......................................................................................10-20

3.4 TRANSPORT MOTOR REMOVAL........................................................10-21

LARGE CAPACITY TRAY A822

1. OVERALL MACHINE INFORMATION.......................................11-1

1.1 SPECIFICATIONS.................................................................................. 11-1

1.2 MECHANICAL COMPONENT LAYOUT................................................. 11-2

1.3 ELECTRICAL COMPONENT DESCRIPTION........................................ 11-3

2. DETAILED DESCRIPTION......................................................... 11-4

2.1 MECHANICAL OPERATION.................................................................. 11-4

2.2 PAPER LIFT MECHANISM .................................................................... 11-5

2.3 PAPER END DETECTION ..................................................................... 11-7

3. REPLACEMENTS AND ADJUSTMENTS..................................11-8

3.1 EXTERIOR COVER REMOVAL ............................................................. 11-8

3.1.1 FRONT COVER REMOVAL .......................................................... 11-8

3.1.2 REAR LOWER COVER REMOVAL............................................... 11-8

3.1.3 TOP COVER REMOVAL ............................................................... 11-8

3.2 PAPER FEED ROLLERS REPLACEMENT............................................ 11-9

3.3 LCT FEED CLUTCH REMOVAL ...........................................................11-10

3.4 UPPER COVER SWITCHES REMOVAL ..............................................11-11

3.5 SIDE-TO-SIDE REGISTRATION ADJUSTMENT..................................11-12

APPENDIX

1.0 DUPLEX JAM TROUBLESHOOTING GUIDE............................A1

SM xi A246/A247/A248



IMPORTANT SAFETY NOTICES

PREVENTION OF PHYSICAL INJURY

1. Before disassembling or assembling parts of the copier and peripherals, make sure that the copier power cord is unplugged.

2. The wall outlet should be near the copier and easily accessible.

3. Note that some components of the copier and the paper tray unit are supplied with electrical voltage even if the main switch is turned off.

4. If any adjustment or operation check has to be made with exterior covers off or open while the main switch is turned on, keep hands away from electrified or mechanically driven components.

5. The inside and the metal parts of the fusing unit become extremely hot while the copier is operating. Be careful to avoid touching those components with your bare hands.

6. The copier is not attached to the table. Pushing the copier too heard may cause it to drop onto the floor. While moving the copier, push the table.

7. When the main switch is tuned on, the machine will suddenly start turning to perform the developer initialization. Keep hand away from any mechanical and electrical components during this period.

HEALTH SAFETY CONDITIONS

1. Never operate the copier without the ozone filters installed.

2. Always replace the ozone filters with the specified ones at the specified intervals.

3. Toner and developer are non-toxic, but if you get either of them in your eyes by accident, it may cause temporary eye discomfort. Try to remove with eye drops or flush with water as first aid. If unsuccessful, get medical attention.

OBSERVANCE OF ELECTRICAL SAFETY STANDARDS

1. The copier and its peripherals must be installed and maintained by a customer service representative who has completed the training course on those models.

CAUTION:

The RAM board on the main control board has a lithium battery which can explode if replaced incorrectly. Replace the RAM board only with an identical one. The man u fact ur er re co m men ds re placi ng the entire RAM board. Do not recharge or burn this battery. Used RAM board must be handled in accordance with local regulations.

SM A246/A247/A248

SAFETY AND ECOLOGICAL NOTES FOR DISPOSAL

1. Do not incinerate the toner cartridge or the used toner. Toner dust may ignite suddenly when exposed to open flame.

2. Dispose of used toner, developer, and organic photoconductor according to local regulations. (These are non-toxic supplies.)

3. Dispose of replaced parts in accordance with local regulations.

4. When keeping used RAM boards in order to dispose of them later, do not put more than 100 RAM boards per sealed box. Storing larger numbers or not sealing them apart may lead to chemical reactions and heat build-up.

A246/A247/A248 SM

Rev. 05/99

OVERALL INFORMATION

SORTER STAPLER A821

DETAILED DESCRIPTIONS

20 BIN SORTER STAPLER A658

INSTALLATION

LARGE CAPACITY TRAY A822

SERVICE TABLES

APPENDIX

TAB

POSITION 1

TAB

POSITION 2

TAB

POSITION 3

TAB

POSITION 4

PREVENTIVE MAINTENANCE

REPLACEMENT AND ADJUSTMENT

TROUBLESHOOTING

DUAL JOB FEEDER A610

TAB

POSITION 5

TAB

POSITION 6

TAB

POSITION 7

TAB

POSITION 8

OVERALL INFORMATION

SPECIFICATION

1. OVERALL MACHINE INFORMATION

1.1 SPECIFICATION

Configuration: Console Copy Process: Dry electrostatic transfer system Toner Supply Control: Fuzzy Control Photoconductor: OPC drum Originals: Sheet/Book Original Size: Maximum A3/11" x 17" Original Alignment: Left rear corner Copy Paper Size: Maximum A3/11" x 17" (Tray & By-pass)

A4/8

Minimum A5/5

A4/8 A6/5

" x 11" (Tandem LCT)

1/2

" x 8

1/2

" x 11" (Tandem LCT)

1/2

" x 8

1/2

" (Tray)

1/2

" (By-pass)

1/2

Overall

Information

Duplex Copying: Maximum A3/11" x 17"

Minimum A5/5

1/2

" x 8

" (Sideways)

1/2

Copy Paper Weight: Paper tray: 52 ~ 128 g/m2, 14 ~ 34 lb

By-pass feed table: 52 ~ 200 g/m2, 14 ~ 53 lb Duplex copying: 64 ~ 104 g/m2, 17 ~ 24 lb

Reproduction Ratios: 4 Enlargement and 5 Reduction + Create Margin

(93%)

A4/A3 Version LT/LDG Version

200%

Enlargement

Full Size 100% 100%

Reduction

141% 122% 115%

82% 75% 71% 65% 50%

200% 155% 129% 121%

85% 77% 74% 65% 50%

SM 1-1 A246/A247/A248

SPECIFICATION

Power Source: 115 V, 60 Hz, more than 20 A (for N.A)

220 ~ 240 V, 50 Hz/60 Hz, more than 10 A (for Europe and Asia)

Power Consumption:

- A246 copier -

Copier only Full system*

Warm up 1.20 kVA 1.22 kVA

Stand-by*

Low Power mode*

0.22 kVA 0.24 kVA

0.185 kVA 0.205 kVA

Copying 1.40 kVA 1.40 kVA

Maximum 1.70 kVA 1.75 kVA

Off-mode 0.001 kVA 0.001 kVA

- A247 copier -

Copier only Full system*

Warm up 1.20 kVA 1.22 kVA

Stand-by*

Low Power mode*

0.22 kVA 0.24 kVA

0.21 kVA 0.23 kVA

Copying 1.50 kVA 1.50 kVA

Maximum 1.70 kVA 1.75 kVA

Off-mode 0.001 kVA 0.001 kVA

- A248 copier -

Copier only Full system*

Warm up 1.20 kVA 1.22 kVA

Stand-by*

Low Power mode*

Copying 1.60 kVA 1.60 kVA

Maximum 1.70 kVA 1.75 kVA

Off-mode 0.001 kVA 0.001 kVA

0.22 kVA 0.24 kVA

0.21 kVA 0.23 kVA

*1Full System:

Mainframe with dual job feeder, sorter stapler

•

and 3,500-sheet large capacity tray

: When the anti-condensation heaters are off.

A246/A247/A248 1-2 SM

Noise Emission: Sound Pressure Level:

The measurements are ma de accor di ng t o ISO7779

- A246 copier -

SPECIFICATION

Overall

Information

Sound pressure level

Sound power level

- A247 copier -

Sound pressure level

Sound power level

(The measurements are made according to ISO 7779 at the operator position.)

Copier only

Stand-by Less than 34 dB (A)

Copying Less than 57 dB (A) (average)

(The measurements are made according to ISO 7779.)

Copier only

Stand-by Less than 48 dB (A)

Copying Less than 71 dB (A) (average)

(The measurements are made according to ISO 7779 at the operator position.)

Copier only

Stand-by Less than 34 dB (A)

Copying Less than 59 dB (A) (average)

(The measurements are made according to ISO 7779.)

- A248 copier -

Sound pressure level

Sound power level

Copier only

Stand-by Less than 51 dB (A)

Copying Less than 72 dB (A) (average)

(The measurements are made according to ISO 7779 at the operator position.)

Copier only

Stand-by Less than 36 dB (A)

Copying Less than 59 dB (A) (average)

(The measurements are made according to ISO 7779.)

Copier only

Stand-by Less than 54 dB (A)

Copying Less than 73 dB (A) (average)

SM 1-3 A246/A247/A248

SPECIFICATION

Dimensions:

Width Depth Height

Copier only Copier with dual job feeder, sorter stapler,

and 3,500-sheet large capacity tray Copier with dual job feeder, sorter stapler with

punch, and 3,500-sheet large capacity tray

690 mm

27.2"

1,659 mm

65.4"

1,659 mm

65.4"

698 mm

27.6"

698 mm

27.6"

698 mm

27.6"

980 mm

38.6"

1,113 mm

43.9"

1,113 mm

43.9"

Weight: Copier only: (Without the optional platen cover

= Approximately 2 kg)

Approximately 175 kg

Zoom: From 50% to 200% in 1% steps Copying Speed:

A246 copier

A247 copier 60 31 38 A248 copier 70 36 44

A4/LT (sideways) A3/DLT B4/LG

51 (A4 others) 50 (A4/in France) 50 (LT)

26 32

Warm-up Time: Less than 5 minutes (A246 copier, 20°C)

Less than 5.5 minutes (A247/A248 copier, 20°C)

First Copy Time: (A4/5

" x 11" sideways

1/2

3.1 seconds (A246 copier)

2.6 seconds (A247/A248 copiers)

from the 1st feed station) Copy Number Input: Number keys, 1 to 999 (count up or count down) Manual Image Density

9 steps

Selection: Automatic Reset: 1 minute standard setting; can also be set from 1

second to 999 seconds or no auto reset.

Copy Paper Capacity:

•

By-pass feed table: approx. 50 sheets

•

Paper tray: approx. 550 sheets

•

Tandem LCT tray: approx. 1,550 x 2=3100

sheets

Toner Replacement: 1,160 g/cartridge Developer Replacement: 1 Kg bag, black only.

A246/A247/A248 1-4 SM

SPECIFICATION

Optional Equipment:

•

Platen cover (A528-04)

•

Dual job feeder (A610)

•

20 bin sorter stapler (Floor type) (A821-17:

Ricoh, -22: NRG, -15: Savin/Ges U.S.A. –26: Infotec)

•

3,500-sheet Large capacity tray (A822)

•

Receiving tray (A446-05)

•

Key Counter Bracket D (A509-03)

•

20 bin sorter Stapler (Floor type) with punch

(A821-57 (3 holes), -67 (2 holes): Ricoh, -62: NRG, -66: Infotec, -55: Savin/Ges U.S.A.)

•

Guidance ROM KIT Type U (A870) (Language)

•

Editing sheet (spare part)

•

Original Tray type F (A430-07)

•

Sorter Adapter type L (A902-19)

•

20 bin sorter stapler (Hunging type) (A658)

(A246 copier only)

When the 20 bi n sorter stap le r (A658) is installed onto A246 cop ier, sorter ada pter type L is required.

Overall

Information

SM 1-5 A246/A247/A248

MACHINE CONFIGURATION

1.2 MACHINE CONFIGURATION

1.2.1 COPIER OVERVIEW

- A246/A247/A248 copiers -

•

Tandem LCT

(including two 1,550-sheet LCT

•

Two 550-sheet paper trays

•

Optional 3,500-sheet large capacity tray

•

1,550 x 2

(3,500)

550

By-pass (approx. 50 sheets)

Rev. 06/99

550

A246V500.WMF

1.2.2 SYSTEM OVERVIEW

Hanging S/S

S/S with Punch

S/S

DJF

Original Tray

Tandem LCT

Hanging Sorter Stapler

⇒

(A658) (A246 only)

Universal

Fixed

3,500 sheets

Floor type Sorter Stapler (A821-17, -15, -22, -26) Floor type Sorter Stapler with Punch (A821-57, -67, -55, -62, -66)

Note: Sorter Adapter Type L (A902) needed for ST29 (A658)

A246/A247/A248 1-6 SM

A246V501.WMF

LCT

MEMO

MACHINE CONFIGURATION

Overall

Information

SM 1-7 A246/A247/A248

COPY PROCESS AROUND THE DURM

1.3 COPY PROCESS AROUND THE DURM

A246V502.WMF

1. OPC DRUM

The organic photo conductive (OPC) drum (100 mm diameter) has high resistance in the dark and low resistance under light.

2. DRUM CHARGE

In the dark, the charge corona unit gives a uniform negative charge to the OPC drum. The charge remains on the surface of the drum. The amount of negative charge on the drum is proportional to the negative grid bias voltage applied to the grid plate on the charge corona unit.

3. EXPOSURE

An image of the original is reflected to the OPC drum surface via the optics section. The charge on the drum surface is dissipated in direct proportion to the intensity of the reflected light, thus producing an electrical latent image on the drum surface.

The amount of charge remaining as a latent image on the drum depends on the exposure lamp intensity controlled by the exposure lamp voltage.

4. ERASE

The erase lamp illuminates the areas of the charged drum surface that will not be used for the copy image. The resistance of drum in the illuminated areas drops an d the charge on those areas dissipates.

A246/A247/A248 1-8 SM

COPY PROCESS AROUND THE DURM

5. DRUM POTENTIAL SENSOR

The drum potential sensor detects the electric potential on the drum to compensate image processing elements.

6. DEVELOPMENT

Positively charged toner is attracted to the negatively charged areas of the drum, thus developing the latent image. (The positive triboelectric charge of the toner is caused by friction between the carrier and toner particles.)

The development bias voltage applied to the development roller shaft controls two things:

1) The threshold level if toner is attracted to the drum or toner remains on the development roller.

2) The amount of toner to be attracted to the drum.

The higher the negative development bias voltage is, the less toner is attracted to the drum surface.

7. PRE-TRANSFER LAMP (PTL)

The PTL illuminates the d rum to remove almost all the negat ive charge from the exposed areas of the drum. This makes image transfer easier.

8. IMAGE TRANSFER

Paper is fed to the drum surface at the proper timing so as to align the copy paper and the developed image on the drum surface. Then, a negative charge is applied to the reverse side of the copy paper by the transfer belt, producing an electrical force which pulls the toner particles from the drum surface onto the copy paper. At the same time, the copy paper is electrically attracted to the transfer belt.

Overall

Information

9. PAPER SEPARATION

Paper separates from the OPC drum by the electrical attraction between the paper and the transfer belt. The pick-off pawls help to separate the paper from the drum.

10. CLEANING

The cleaning brush removes toner remaining on the drum after image transfer and the cleaning blade scrapes off all the remaining toner.

11. QUENCHING

Light from the quenching lamp electrically neutralizes the charge potential of the drum surface.

SM 1-9 A246/A247/A248

MECHANICAL COMPONENT LAYOUT

1.4 MECHANICAL COMPONENT LAYOUT

34567891011

39 38

13 14 15

16 17 18

19 20

34 33 32 31 30 29 41 40 2323

A246V503.WMF

A246/A247/A248 1-10 SM

A246V504.WMF

MECHANICAL COMPONENT LAYOUT

1. 3rd Mirror

2. 2nd Mirror

3. 1st Mirror

4. Exposure Lamp

5. Lens

6. Cleaning Brush

7. Cleaning Blade

8. Quenching Lamp

9. Charge Corona Unit

10. OPC Drum

11. 6th Mirror

12. 4th Mirror

13. 5th Mirror

14. Erase Unit

15. Drum Potential Sensor

22. Registration Rollers

23. Transfer Belt

24. Vertical Transport Rollers

25. Tandem LCT Tray

26. Universal Tray (550-sheet)

27. 550-sheet Tray

28. Toner Collection Bottle

29. Transfer Belt Cleaning Blade

30. Hot Roller

31. Pressure Roller

32. Jogger Fences

33. Duplex Positioning Roller

34. Duplex Pick-up Roller

35. Duplex Feed Roller

36. Separation Belt

Overall

Information

16. Toner Hopper

17. Development Unit

18. Pre-Transfer Lamp

19. Pick-up Roller

20. Feed Roller

21. Separation Roller

37. Junction Gate

38. Exit Rollers

39. Optics Cooling Fan

40. Transfer Belt Cleaning Bias Roller

41. Transfer Belt Bias Roller Blade

SM 1-11 A246/A247/A248

DRIVE LAYOUT

1.5 DRIVE LAYOUT

917













4 5







Main Motor



Scanner Drive Motor



Fusing/Duplex Drive Motor

Paper Feed Motor





Toner Collection Motor



Registration Motor



By-pass Feed Motor



By-pass Feed Clutch

Development Drive Motor

A246V505.WMF

1. To OPC Drum

2. To Scanner Unit

3. To Transfer Belt Unit

4. To Paper Exit Unit

5. To Fusing Unit

6. To Duplex Unit

7. To Cleaning Unit

8. To Paper Feed Units

9. To Toner Hopper

10. To Development Unit

A246/A247/A248 1-12 SM

1.6 PAPER PATH

1.6.1 STANDARD COPYING

[F]

[E]

[D]

[C]

PAPER PATH

Overall

Information

[B]

[A]

A246V506.WMF

Paper feed begins from the exterior LCT, by-pass feed table or paper feed stations in the paper tray unit. The copy paper then follows one of two paths inside the copier. The path followed depends on which mode the operator has selected. For copy processing, all sheets follow the same paths from the paper feed mechanism [A] through the registration rollers [B], transfer belt [C], and fusing unit [D]. After that, copies are delivered to the sorter bins [E] or proof tray [F], however, 2 sided copies are diverted for further processing.

SM 1-13 A246/A247/A248

PAPER PATH

1.6.2 MULTIPLE 2-SIDE COPYING

a. Front Side

b. Rear Side

[B]

[A]

[D]

[C]

A246V507.WMF

A246V508.WMF

In this mode the junction gate [A] directs sheets exiting the fusing unit to the duplex tray entrance. After that, all sheets follow the path through the duplex entrance rollers [B].

After all front side copying is fed, the sheets on the duplex tray are fed in order from the bottom to the top and follow the path through the duplex feed mechanism and vertical transport rollers [C] to the registration rollers [D]. After that, these sheets follow the same path as standard copying from the registration rollers to the sorter.

A246/A247/A248 1-14 SM

ELECTRICAL COMPONENT DESCRIPTION

1.7 ELECTRICAL COMPONENT DESCRIPTION

Refer to the electrical component layout on the reverse side of the point-to-point diagram for the location of the components using the symbols and index numbers.

Symbol Name Function Index No.

Motors

M1 Scanner Drives the 1st and 2nd scanners. 5 M2 3rd Scanner Drives the 3rd scanner. 11 M3 Lens Horizontal Shifts the lens vertical position. 10 M4 Lens Vertical Shifts the lens horizontal position. 19 M5 Main Drives the main unit components. 120 M6 Development Drives the development unit. 121

M7 M8

M9 M10 M11 M12 M13 M14 M15

M16 By-pass Feed Drives the by-pass feed rollers. 124 M17 Registration Drives the registration rollers. 123

M18 M19

M20 Optics Cooling Fan Removes heat from the optics unit. 21 M21

M22 M23 M24

Toner Bottle Charge Wire

Cleaner Fusing/Duplex Drives the fusing unit, the duplex unit,

Toner Collection Toner Recycle Drives the air pump to send recycled Paper Feed Drives all feed and transport rollers in the 1st Lift 2nd Lift Raises the bottom plate in the 2nd paper 3rd Lift Raises the bottom plate in the 3rd paper

Rear Fence Moves the paper stack in the left tandem Jogger

Optics Board Cooling Fan

Drum Cooling Fan Cools the drum unit to removes heat Duplex Cooling Fan Exhaust Fan Removes heat from around the fusing

Rotates the toner bottle to supply toner to toner hopper.

Drives the charge wire cleaner to clean the charge wire.

and the exit rollers. Transports the collected toner in the

toner recycle unit for toner recycle. toner to the development unit. paper tray unit.

Raises and lowers the bottom plate in the 1st paper tray.

tray. tray.

tray to the right tandem tray. Drives the jogger fences to square the

paper stack in the duplex unit.

Removes heat from around the optics board.

from around the duplex unit. Cools the paper on the duplex tray to

reduce the heat around the drum. unit.

133

30 119 126 129

118 106 114 104

Overall

Information

SM 1-15 A246/A247/A248

ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

Magnetic Clutches

MC1

Toner Supply

Turns the toner supply roller to supply toner to the development unit.

122

MC2 Toner Recycling Drives the toner recycling unit. 125 MC3 1st Feed Starts paper feed from tray 1. 75 MC4 2nd Feed Starts paper feed from tray 2. 79 MC5 3rd Feed Starts paper feed from tray 3. 82 MC6 By-pass Feed Starts paper feed from the by-pass table. 64

Duplex Transport Drives the duplex transport rollers to

MC7

transport the paper to the vertical

transport rollers.

MC8

Duplex Feed Starts paper feed out of the duplex tray

to the duplex transport rollers.

Switches

SW1 Main Provides power to the copier. 117 SW2

SW3 SW4

Front Door Safety Cuts the power line and detects is the

front door is opened or not.

Toner Collection Bottle

2nd Paper Size

Detects if the toner collection bottle is set or not.

Determines what size paper is in the 2nd paper tray.

115 128 100

SW5 3rd Tray Set Detects if the 3rd tray is set or not. 99 SW6

By-pass Table Detects if by-pass feed table is open or

closed.

Solenoids

SOL1 SOL2 SOL3 SOL4 SOL5 SOL6 SOL7 SOL8

SOL9

SOL10

Transfer Belt Positioning

Controls the up-down movement of the transfer belt unit.

1st Pick-up Controls the up-down movement of the

pick-up roller in tray 1.

2nd Pick-up

Controls the up-down movement of the pick-up roller in tray 2.

3rd Pick-up Controls the up-down movement of the

pick-up roller in tray 3.

By-pass Pick-up Controls the up-down movement of the

pick-up roller for by-pass feed.

1st Separation Roller

2nd Separation Roller

3rd Separation Roller

Right Tandem Lock

Controls the up-down movement of the separation roller in tray 1.

Controls the up-down movement of the separation roller in tray 2.

Controls the up-down movement of the separation roller in tray 3.

Locks the right tandem tray during transporting the paper from right tray to left tray.

Left Tandem Lock Locks the left tandem tray so that it can

be separated from the right tandem tray.

101

A246/A247/A248 1-16 SM

ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

SOL11 SOL12 SOL13 SOL14 SOL15 SOL13

Front Side Fence Rear Side Fence Controls the open and close movement Duplex Positioning Controls the up-down movement of the Pressure Arm Guide Plate Opens the guide plate when a paper Junction Gate Moves the junction gate to direct copies

Controls the open and close movement of the front side fence.

of the rear side fence. positioning roller.

Presses the paper on the duplex tray against the duplex feed rollers.

misfeed occurs around this area. to the duplex tray or to the paper exit.

Sensors

S1 S2 S3 S4

Scanner HP Informs the CPU when the 1st and 2nd

scanners are at the home position.

3 rd Scanner HP

Informs the CPU when the 3rd scanner is at the home position.

Lens Vertical HP Informs the CPU when the lens is at the

full-size position.

Lens Horizontal HP Informs the CPU when the lens is at the

horizontal home position.

2 9 7

S5 APS Detects original size. 20 S6

Auto Image Density Senses the background density of the

original.

6 S7 Drum Potential Detects the drum surface potential. 31 S8

Toner Density Image Density Detects the density of the ID sensor

Detects the amount of toner in the developer.

pattern on the drum.

37 32

S10 Toner Near End Detects the toner end condition. 36

1st Paper Feed Controls the 1st paper feed clutch off/on

S11

timing and the 1st pick-up solenoid off

timing.

2nd Paper Feed Controls the 2nd paper feed clutch off/on

S12

timing and the 2nd pick-up solenoid off

timing.

3rd Paper Feed

S13

Controls the 3rd paper feed clutch off/on timing and the 3rd pick-up solenoid off

timing.

S14 S15 S16 S17

1st Lift Det ect s when the paper in tray 1 is at the

correct height for paper feed.

2nd Lift

Detects when the paper in tray 2 is at the correct height for paper feed.

3rd Lift Detects when the paper in tray 3 is at the

correct height for paper feed.

1st Paper End Informs the CPU when tray 1 runs out of

paper.

93 80 85 92

Overall

Information

SM 1-17 A246/A247/A248

ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

S18 S19 S20 S21 S22 S23

S24

2nd Paper End 3rd Paper End Informs the CPU when tray 3 runs out of By-pass Paper End I nforms the CPU that there is no paper in 1st Paper Near End 2nd Paper Near

End 3rd Paper Near End Informs the CPU when the paper in tray

Right Tray Down

Informs the CPU when tray 2 runs out of paper.

paper. the by-pass feed table.

Informs the CPU when the paper in tray 1 is almost finished.

Informs the CPU when the paper in tray 2 is almost finished.

3 is almost finished. Informs the CPU when the bottom plate

is completely lowered, to stop the 1st tray

90 88 65 53 77 86

lift motor.

S25 S26 S27 S28 S29 S30 S31 S32

Right Tray Paper Detects whether there is paper in the

right tandem tray.

Front Side Fence Open

Front Side Fence Close

Rear Side Fence Open

Rear Side Fence Close

Informs the CPU when the front side fence is open.

Informs the CPU when the front side fence is close.

Informs the CPU when the rear side fence is open.

Informs the CPU when the rear side fence is close.

Rear Fence HP Informs the CPU when the tandem tray

rear fence is in the home position.

Rear Fence Return Informs the CPU when the tandem tray

rear fence is in the return position.

Left Tandem Paper Inform s the CPU when the left tandem

tray runs out the paper.

50 58 57 48 47 59 51

56 S33 Paper Guide Detects the misfeeds. 61 S34

Duplex Entrance

Detects the leading edge of the paper to determine duplex feed clutch off timing.

Duplex Transport Detects the leading edge of the paper to

S35

control the jogger motor and the

positioning solenoid on timing.

Duplex Exit

S36

Detects the leading edge of the paper to determine duplex transport clutch on

timing.

S37 Duplex Paper End Detects the paper in the duplex tray. 46 S38

S39

Jogger HP Detects if the duplex jogger fences at the

home position or not.

Vertical Transport

Detects the leading edge of the paper to determine the paper feed timing of next

sheet.

S40

Guide Plate Position

Detects whether the registration guide plate is closed.

A246/A247/A248 1-18 SM

ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

S41

Registration

Detects misfeeds and controls the registration roller on-off timing.

70 S42 Fusing Exit Detects misfeeds. 72

S43 Exit Detects misfeeds. 73 S44

S45

S46

S47

Auto Response Toner Overflow Detects when the toner collection bottle Original Length

(LT version only) Platen Cover

Position 1 (Option)

Returns the display from the screen saver.

is full. Detects the original length.

Inform the CPU that the platen cover is in the up or down position (related to

127

APS/ARE function).

S48

Platen Cover Position 2 (Option)

Inform the CPU that the platen cover is in the up or down position to detect if the

original has been removed or not.

PCBs

PCB1 Main Controls all machine functions. 107 PCB2

AC Drive Provides ac power to the fusing lamp and

exposure lamp.

102

PCB3 DC Power Supply Pr o vides dc power. 110 PCB4 Opt ic Control Controls all optics components. 105

PCB5 PCB6

PCB7

Paper Feed Control Controls all components in the paper

bank.

Operation Panel Control

Left Operation Panel

Controls LEDs and LCD on the operation panel.

Interfaces the LEDs, keys, and the auto response sensor on the left operation

109

panel.

PCB8 PCB9

Right Operation Panel

By-pass Paper Size Inform the CPU what size of the paper is

Interfaces the LEDs and keys on the right operation panel.

in the by-pass feed table.

Overall

Information

Lamps

Exposure Lamp Applies high intensity light to the original

for exposure.

L2 Fusing Lamps Provide heat to the hot roller. 24 L3

L4 L5

Quenching Neutralizes any charge remaining on the

drum surface after cleaning.

Erase

Discharge the drum outside of the image area.

Pre-transfer Reduce the charge on the drum surface

before transfer.

SM 1-19 A246/A247/A248

ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

Power Packs

Charge

PP1

Provides high voltage for the charge corona wires and the grid plate. Interfaces the QL, PTL, and charge wire

cleaner motor control signals.

Development Provides high voltage for the

PP2

development unit. Interfaces the transfer p.p. and the

108

charge p.p. signals.

Transfer Provides high voltage for the transfer

PP3

belt. Interfaces the transfer belt positioning

solenoid control signal.

Heaters

Optic Anti-condensation

Turns on when the main switch is off to prevent moisture from forming on the

optics.

Transfer Anti-condensation

Turns on when the main switch is off to prevent moisture from forming on the

134

optics.

H3 H4

Upper Tray Turns on when the main switch is off to

keep paper dry in the paper tray.

Lower Tray

Turns on when the main switch is off to keep paper dry in the paper tray.

131 130

Thermistors

TH1

Optic

Monitors the temperature of the optics cavity.

TH2 Fusing Detects the temperature of the hot roller. 25 TH3

Drum Monitors the temperature of the OPC

drum.

Others

CB1 CO1 CO2

LA1

LCD1

Circuit Breaker Provides back-up high current protection

for the electrical components.

Total Counter Keeps track of the total number of copies

made.

Key Counter

Keeps track of the total number of copies made when the key counter is set.

Lightening Arrestor Removes current surges from the ac

input lines.

LCD Displays the operation menus and

messages. NF1 Noise Filter Remove the electrical noise. 112 RA1 Main Power Relay Controls main power. 103

TF1

Fusing Thermofuse Opens the fusing lamp circuit if the fusing

unit overheats.

113 132

116

A246/A247/A248 1-20 SM

ELECTRICAL COMPONENT DESCRIPTION

Symbol Name Function Index No.

TR1 TS1

Transformer (220 V version only)

Optics Thermoswitch

Makes power for the exposure lamp.

Opens the exposure lamp circuit if the

optics unit overheats.

111

Overall

Information

SM 1-21 A246/A247/A248

DETAILED DESCRIPTIONS

PROCESS CONTROL

2. DETAILED SECTION DESCRIPTIONS

2.1 PROCESS CONTROL

2.1.1 OVERVIEW

inal Scale

Ori

Image Density Control (Fuzzy Control)

Latent Image Control

VD Pattern VL Pattern

Latent Image Control

Exposure Control

Charge Control

Drum Thermistor

Lamp Voltage

Grid Voltage

Paper

ADS Pattern

VD Pattern

Erase Lamp

Drum Potential Sensor

Detailed

Descriptions

Pattern

Original Exposure Glass

Toner Supply On Time

Development Bias

TD Sensor

ID Sensor

Image Density Control

(Fuzzy Control)

Toner Supply Control

Main PCB

A246D529.WMF

This model uses two process control methods. One compensates for variation in the drum potential (latent image control) and the other controls the toner concentration and toner supply amount (image density control).

SM 2-1 A246/A247/A248

PROCESS CONTROL

Latent Image Control

Charge

Exposure

Black White

Erase

A246D550.WMF

The figure shows drum potential changes during the copy process.

VO: The drum potential just after charging the drum. VD (Dark Potential): The drum potential just after exposing the black

pattern (VD pattern)

VL (Light Potential): The drum potential just after exposing the white

pattern (VL pattern)

Potential Sensor

Drum

VR (Residual Voltage): The drum potential ju st after the exposure to the

erase lamp.

After long usage following installation or a PM, drum potential will gradually increase due to the following factors:

•

Dirty optics or exposure lamp deterioration

•

A dirty charge corona casing and grid plate

•

A change in drum sensitivit y

In this copier, the drum potential sensor detects the change in drum potential and controls the following items to maintain good copy quality:

•

The grid-bias voltage

•

The exposure lamp voltage

•

The development bias voltage.

A drum thermistor detects the drum temperature and acquires data. The thermistor uses this data to control the above voltages. It is impossible to explain this process simply because it is controlled by methods developed in our laboratories using an artificial neural network.

A246/A247/A248 2-2 SM

PROCESS CONTROL

Image Density Control

The following sensors control image density:

•

Toner Density sensor (TD sensor)

•

Image Density sensor (ID sensor)

Data from the TD sensor maintains the toner concentration in the developer at a constant level. However, the image on the OPC drum varies due to the variation in toner chargeability (influenced by the environment), even if the toner concentration is constant. Toner concentration changes to maintain the image density on the OPC drum because of compensation by the ID sensor.

The following items are controlled to maintain a constant copy image density:

•

Toner supply clutch on time

•

Toner supply level data (V

) of the TD sensor

REF

Detailed

Descriptions

SM 2-3 A246/A247/A248

PROCESS CONTROL

2.1.2 PROCESS CONTROL DATA INITIAL SETTING

The following flow chart shows the steps performed when turning on the machine while the hot roller temperature is below 100°C. This initializes all the process control settings.

A246/A247/A248 2-4 SM

2.1.3 LATENT IMAGE CONTROL

Drum Potential Sensor Calibration

[A]

PROCESS CONTROL

Case Sensor

Output

Amp.

Detailed

Descriptions

Drum

[B]

A246D554.WMF

Main PCB

A246D552.WMF

The potential sensor [A] for the drum is just above the development unit. The sensor has a detector that detects the strength of the electric field from the electric potential on the drum. The output of the sensor depends on the strength of the electric field.

Since environmental conditions affect sensor output, such as temperature and humidity, the sensor output is calibrated during process control data initialization.

The High Voltage Control PCB [B] has two relay contacts. Usually RA602 grounds the drum. However, during the initial setting, the main PCB turns RA601 on and RA602 off and applies the voltage to the drum shaft.

By measuring the output of the drum potential sensor when –100 V and –800 V are applied to the drum, the sensor output is calibrated automatically. (The machine recognizes the relationship between actual drum potential and the potential sensor output.) To prevent toner attraction during potential sensor calibration, an equivalent bias voltage (-100V and -800V) is applied to the development rollers.

SM 2-5 A246/A247/A248

PROCESS CONTROL

Drum Conditioning

When the fu sing temperature reaches 18 0°C, the machine starts the drum conditioning process. In this mode, the main moto r, main charge corona, erase lamp and development bias are activated for about 30 seconds and drum sensitivity and residual voltage (VR) are stabilized, as in continuous copy run s .

VSG Adjustment

During drum conditioning, the ID sensor checks the reflectivity of the bare drum and calibrates the output of the ID sensor to 4 ± 0.2 V.

VR Measurement

[-V]

New Drum Used Drum

Drum Potential

Original Density

LightDark

A246D561.WMF

The above figure shows the relationship between the drum potential and the original density. This relationship must persist to maintain copy quality.

Since this relationship tends to change to the one represented by the dotted line by various factors, some compensation is necessary.

Increasing the exposure lamp voltage cannot compensate for the residual voltage (VR). Therefore, other means are required to compensate for VR change.

After drum conditioning the main control PCB turns on the erase lamps. Then the drum potential is checked by the potential sensor. This measured drum potential is in fact VR. This VR is used as the standard for the VD and VL corrections.

NOTE:

In the figure above, the residual voltage (VR) for the new drum is 0 V. Actually, there is some residual voltage even on a new drum.

A246/A247/A248 2-6 SM

VD Correction

[-V]

PROCESS CONTROL

Exposure

Pattern

Glass

A246D566.WMF

Drum Potential

-770

New Drum

Original Density

VD Compensated

After many copies

LightDark

A246D568.WMF

The drum potential just after the black pattern (VD Pattern) is exposed (VD: Dark Potential) tends to lower during drum life due to a decrease in the capacity of the drum to carry a charge.

Detailed

Descriptions

To check the actual VD, the first scanner moves to the home position, exposing the VD pattern (Black) stuck on the bottom side of the exposure glass bracket on the drum.

The main control board measures VD using the drum potential sensor and adjusts it to a target value by adjusting the grid-bias voltage (V

GRID

On the other hand, there is a change of the drum residual voltage (VR), so that the target VO voltage is compensated as follows:

Target VD Value: VD = VR + (–770) The adjusted grid-bias volta ge (V

) remains in memory until the next process

GRID

control data initialization.

SM 2-7 A246/A247/A248

PROCESS CONTROL

VL Correction

[-V]

Drum Potential

-770

-140

Exposure

Glass

A246D566.WMF

VL Pattern

Original Density

Only VD Compensated

VD and VL Compensated

LightDark

A246D594.WMF

New Drum

Dirty optics and/or exposure lamp deterioration decreases the intensity of the light that reaches the drum. In addition to this, the drum sensitivity also changes during the life of the drum. These factors change the drum potential just after white pattern exposure (VL: Light Potential).

To check the actual VL, the lens moves to the VL pattern check position. This exposes the VL pattern (White) mounted underneath the original scale on the drum.

The main control board measures VL using the drum potential sensor and adjusts it to a target value by adjusting the exposure lamp voltage (V

LAMP

The residual voltage (VR) change also affects VL, so that VL's target voltage is compensated as follows:

Target VL Value: VL = VR + (–140)

The adjusted exposure lamp voltage (V

) is stored in memory until the next

LAMP

initial setting of the process control data.

A246/A247/A248 2-8 SM

VR Correction

[-V]

Drum Potential

-770

-140

PROCESS CONTROL

Development Bias (VBB)

VD and VL Compensated

New Drum

Detailed

Descriptions

Dark Light

Original Density

A246D602.WMF

The potential sensor monitors potentials (VR, VD, and VL). During the check cycle, the VD and VL patterns are exposed. The potential sensor checks the drum potential on the area exposed by each pattern.

Compare the curve of the VD and VL compensated drum potential with the curve of the new drum, they are parallel but the compensated potential is still higher (VR) than the new drum potential. To prevent dirty backgrounds due to increased residual potential, development bias (VBB) is applied as follows:

VBB = VR + (–220)

The adjusted development bias (V

control initial setting.

BB) is stored in memory until the next process

SM 2-9 A246/A247/A248

PROCESS CONTROL

Initial Setting Sequence

The following graph shows the sequence of events during the initial setting of the process control data.

For the purpose of ADS sensor correction

Exposure Lamp

Potential Sensor Output

800

100

1. Potential sensor

2. VR’, VD’, VL’

Latent Image Control

potential

New V

3. V

New V

D, VL

correction

4. ID sensor pattern potential

A246D604.WMF

1. Potential sensor calibration Measuring the output of the drum potential sensor when applying –100 V and –800 V to the drum, automatically calibrates the sensor output (V

100

and V

See page 2-5 for details.

800

2. VR, VD, VL potential detection After about 30 seconds of drum conditioning, VD and VL Patterns are developed by using the previous grid-bias voltage (V lamp voltage (V

The machine calculates the new V

) data to detect the VR, VD, VL data.

LAMP

and V

GRID

data using the detected VR,

LAMP

) data and exposure

GRID

VD, and VL data.

A246/A247/A248 2-10 SM

PROCESS CONTROL

3. VD and VL corrections Using the calculated V

GRID

and V

data, the VR, VD, and VL patterns are

LAMP

redeveloped thereby determining the new VR, VD, and VL data. If both VD and VL data are within specifications, the new VD, VL, and VR values determine the new V

GRID

, V

and development bias (VBB).

LAMP

Specifications:

VD = –770 + VR ± 20 V VL = –140 + VR ± 20 V

If VD is outside specifications, V measured and VD is detected again. The same is done for VL and V

is shifted one step. Then the VD pattern is re-

GRID

LAMP

. The above process continues until both VD and VL fall within specifications. The graph on the previous page shows an example of when only VL was outside the specifications at the first VL detection. It came within specifications after one V correction by changing V

0.5 V/step, and V

LAMP

by 20 V/step.

GRID

Detailed

Descriptions

The machine stops VD/VL correction and uses the previous V

GRID

and V

LAMP

values during copying in the following instances:

•

If V

100

or V

at the calibration of the drum potential sensor is outside

800

specifications.

•

If VD or VL does not fall within specifications after shifting V

GRID

or V

LAMP

their maximum and/or minimum levels.

In this case, the machine indicates nothing, but the SC counter increments. Related SC codes (see troubleshooting section for details):

Code Condition

361 Incomplete drum potential sensor calibration 364 Abnormal VD detection 365 Abnormal VL detection 366 VR abnormal

Utilizing VR in the following manner can also determine the development bias:

VBB = VR + (–220)

4. The ID sensor pattern for potential detection

This determines the ID Sensor Bias Voltage. The development control section explains this subject in more detail (see page 2-16).

SM 2-11 A246/A247/A248

PROCESS CONTROL

2.1.4 IMAGE DENSITY CONTROL

Toner Density Sensor

OUT

A: V B: V C: V

(Gain data) is high.

OUT

is within the specification.

OUT

(Gain data) is

low

Main PCB

AGC

OUT IN X

V=V

= 12 x

OUT

Gain

256

Gain

256

(12 V)

GND

Sensor Output

TD Sensor

A246D606.WMF

A246D531.WMF

Developer consists of carrier particles (iron) and toner particles (resin and carbon). Inside the development unit, developer passes through a magnetic field created by coils inside the toner density sensor. When the toner concentration changes, the voltage output by the sensor changes accordingly.

When installing new developer with the standard toner concentration (2.0% by weight, 20 g of toner in 1,000 g of developer), the initial setting for the developer must be performed by using an SP mode (SP1-2-1).

During this setting, the output voltage (V

) from the auto gain control circuit

OUT

(AGC) on the main control board PCB varies to change the output voltage from the toner density (TD) sensor. Changing the gain data does this:

V= V x

OUT IN

Gain Data

256

12 x

Gain Data

256

If the data is large, V results in the sensor sensitivity illustrated by curve A. If the data is small, V

and the sensor output voltage also become large. This

OUT

becomes small, and the sensor output voltage becomes small. As a result, the sensor sensitivity shifts as illustrated by curve C.

A246/A247/A248 2-12 SM

PROCESS CONTROL

By selecting the proper ga in data, the sensor output is set within the targeted control level (V

REF

, V

= 2.5 ± 0.1 V). Now, curve B shows the sensor

REF

characteristic and the TD sensor initial setting is complete. The selected gain data is stored in memory, and V

from the auto-gain control

OUT

circuit stays constant during the detection cycle for the toner sensor.

Toner density detection in the developer occurs once in every copy cycle. The sensor output voltage (VTD) during the detection cycle is compared with the toner supply level voltage (V

REF

VTD ≥ V VTD < V

: Add more toner

REF

: Add little toner

REF

Detailed

Descriptions

A246D609.WMF

SM 2-13 A246/A247/A248

PROCESS CONTROL

To stabilize toner concentration, the toner supply (toner supply clutch ON period) is controlled by using V

and VTD data.

REF

The toner supply is calculated after each copy. The following factors determine the remaining toner supply:

 

V V

– V

REF REF

– VTD’(VTD’ = VTD of the previous copy cycle)

A246D512.WMF

By referring to these factors, the machine recognizes the difference between the current and target toner concentration. The machine also understands how much the toner concentration changed and can predict how much the toner supply amount will probably change. Precision changes in the toner supply maintain the toner concentration (image density). Since updating the toner supply clutch ON period is under fuzzy cont rol, the relation among VTD, VTD’, V

cannot be expressed by a simple algebraic

REF

formula.

Correction>

REF

The image on the OPC drum changes due to the varia tion in toner chargeability (influenced by the environment) even if the toner concentration is constant. The image density sensor (ID sensor) directly checks the image on the OPC drum and shifts V

data (under fuzzy control) to keep the image on the OPC drum

REF

constant, as explained in the next section. NOTE: 1) The toner end sensor detects the toner end condition (see the

development section for detail s) .

2) The toner supply clutch turns on at intervals between each copy process, while image development is not occurring.

A246/A247/A248 2-14 SM

Image Density Sensor Detection

PROCESS CONTROL

[B]

[C]

Drum

[A]

Bias

A246D514.WMF

A246D513.WMF

The ID sensor [A] checks VSG and VSP. The ID sensor is located underneath the drum cleaning section. There is no ID sensor pattern in the optics; however, the charge corona unit [B] and the erase lamp [C] make a pattern image on the OPC drum.

Detailed

Descriptions

VSG is the ID sensor output when checking the erased drum surface. VSP is the ID sensor output when checking the ID sensor pattern image.

To compensate for any variation in light intensity from the sensor LED, the reflectivity of both the erased drum surface and the pattern on the drum are checked.

VSP Detection

V Detection

1st Series of Copies (8 copies)

2nd Series of Copies (5 copies)

V Detection

VSP Detection

V Detection

3rd Series of copies (17 copies)

Detection

V Detection

A246D515.WMF

VSG is detected every time the machine starts copying. During VSG detection, the development sleeve rollers do not rotate and development bias is not applied. If 10 or more copies are made, the copier will re-detect VSP. Since the transfer belt must be released when checking VSP, the machine cannot check the VSP during continuous copying.

SM 2-15 A246/A247/A248

PROCESS CONTROL



Potential

Sensor Detection



ID Sensor

Bias Level

4.0 V



ID Sensor

Output

–800



IDB

= VP + 300 (V)



–300

A246D516.WMF



A246D517.WMF

While developing the ID sensor pattern, ID sensor bias is applied. ID sensor bias is determined during process control data initialization as follows:

Apply charge while the grid voltage is –800 V to create the ID sensor pattern. Check the drum potential (VP) of the latent image created by the charge with –800

V grid. Adjust the ID sensor bias (V

= VP – (–300) (V)

IDB

) so that it satisfies the following formula:

IDB

= VP + 300 (V)

Change the bias to the calculated V

and detect VSP. The VSG value detected

IDB

during its adjustment sequence during process control data initialization and the VSP determine the V

data. The V

REF

does not change until the next initial

IDB

setting for the process control data.

After the series of copies is completed, when 10 or more copies were made, V is updated by referring to the previous V

Correction Timing>

REF

’), VSG, VSP and the current TD

REF

sensor output (VTD). Since this V

’, VSG, VSP and VTD cannot be expressed in a simple algebrai c formul a.

REF

The V

is not only updated in the above case, but also during the initial setting

REF

data updating is under fuzzy control, the relationship among V

REF

for the developer and during process control data initialization.

A246/A247/A248 2-16 SM

PROCESS CONTROL

Sensor Abnormal Conditions

a) ID sensor (VSG, VSP) abnormal

Whenever VSG falls under 2.5 V or VSP rises over 2.5 V, the CPU fixes the V data and the TD sensor output controls the toner concentration.

Normal detection of VSG and VSP occurs, as usual, during abnormal conditions. If output returns to normal levels (VSG ≥ 2.5 V, VSP ≤ 2.5 V), the CPU returns the toner concentration control to normal mode.

REF

b) TD sensor (VTD) abnormal

Whenever VTD rises over 4.0 V or falls under 0.5 V, the CPU shifts the toner supply to the fixed supply mode. In this condition, the CPU never stops the toner supply. The fixed toner supply can be changed in four steps (4%, 7%, 11%, and 14%) by using an SP mode. The default fixed toner supply is 4%.

Detection of VTD still occurs, as usual, during abnormal conditions. If its output returns to a normal level, the CPU returns the toner concentration control to normal mode.

c) Drum Potential Sensor abnormal

The CPU shifts the toner supply to fixed supply mode, when the TD sensor (VTD) detects an abnormal condition, in the following cases:

•

rises over 0.7 V or falls under 0.1 V

100

rises over 4.2 V or falls under 2.7 V

800

Related SC codes. (See troubleshooting section of details.):

Code Condition

351 352 Incomplete TD Sensor Initial Sett ing 353 354 355 356 358 361 Incomplete Drum Potential Sensor Calibration

Abnormal V

Abnormal V Abnormal V Abnormal V Abnormal V Abnormal V

Detection (VSG > 4.2 V)

Detection (VSP > 2.5 V)

Detection (VSG ≤ 2.5 V)

Detection (VTD > 4.7 V)

Detection (VTD < 0.5 V)

TD SP/VSG

Detection (VSP/VSG < 0.025 V)

Detailed

Descriptions

SM 2-17 A246/A247/A248

DRUM UNIT

2.2 DRUM UNIT

2.2.1 OVERVIEW

11 10

1514

7, 8 62

A246D518.WMF

The drum unit consists of the components as shown in the above illustration. This model uses an organic photoconductor drum (diameter: 100 mm).

1. OPC Drum

2. Paper Guide Spurs (60/70 cpm only)

3. Erase Lamp

4. Drum Potential Sensor

5. Pre-transfer Lamp

6. Pick-off Pawl

7. Image Density Sensor

8. Drum Thermistor

9. Cleaning Brush

10. Toner Collection Coil

11. Cleaning Blade

12. Ozone Filter

13. Cleaning Filter

14. Charge Powe r Pack

15. Quenching Lamp

16. Main Charge Corona Unit

A246/A247/A248 2-18 SM

2.2.2 OPC DRUM CHARACTERISTICS

An OPC has the following characteristics:

1) Accepts a high negative electrical charge in the dark. (The electrical resistance of a photoconductor is higher with the absence of light.)

2) Dissipates the electrical charge when exposed to light. (Exposure to light greatly increases the conductivity of a photoconductor.)

DRUM UNIT

3) Dissipates an amount of charge in direct proportion to the intensity of the light. That is, the stronger the light focused on the photoconductor surface is, the smaller the voltage remaining on the OPC.

4) Less sensitive to changes in temperature (when compared to selenium F type drums).

5) Less sensitive to changes in rest time (light fatigue). This makes it unnecessary to compensate for the development bias voltage resulting from variations in the rest time.

Detailed

Descriptions

SM 2-19 A246/A247/A248

DRUM UNIT

2.2.3 DRUM CHARGE

Overview

[A]

A246D519.WMF

This copier uses a double corona wire scorotron system for the drum charge. Two corona wires are required to give sufficient negative charge on the drum surface because of a rather high drum speed (50/51 cpm machine: 330 mm/seconds, 60 and 70 cpm machines: 430 mm/seconds.). The stainless steel grid plate makes the corona charge uniform and controls the amount of negative charge on the drum surface by applying negative grid-bias voltage.

The charge power pack [A] supplies constant current to the corona wires (–1,200

A). Bias voltage supplied to the grid plate is automatically controlled to maintain proper image density even if the OPC drum potential changes due to a dirty grid plate or the charge corona casing.

A246/A247/A248 2-20 SM

Air Flow Around the Drum

DRUM UNIT

[A]

[C]

[E]

[D]

[B]

A246D520.WMF

The exhaust fan [A] located above the fusing unit provides an airflow to the charge corona unit to prevent uneven build-up of negative ions that can cause an uneven charge on the drum surface as shown.

An ozone filter [B] absorbs the ozone (O3) around the drum. The exhaust fan rotates slowly during stand-by and rotates quickly during copying

to keep the temperature inside the machine constant.

Detailed

Descriptions

There is another fan (the drum-cooling fan [C]), which is located on the right rear side of the machine (front view). The drum-cooling fan cools the drum unit to remove the heat from the duplex tray. The drum has 12 holes in each drum flange [D]. Air flows into the drum, through the holes in the drum flange. To prevent foreign matter from entering the inside of the copier, there is a dust protection filter in the entrance [E] of the duct.

SM 2-21 A246/A247/A248

DRUM UNIT

Charge Wire Cleaning Mechanism

[A]

[C]

[A]

[C]

[B]

A246D521.WMF

The flow of air around the charge corona wire may deposit toner particles on the corona wires. These particles may interfere with charging and cause low-density bands on copies.

The wire cleaner pads [A] automatically clean the wires to prevent such a problem. A DC motor [B] drives the wire cleaner. Normally the wire cleaner [C] is in the front-

end position (home position). After 5,000 copies and when the fusing temperature is less than 100°C after the main switch is turned on, the wire cleaner motor brings the wire cleaner to the rear end and then back to the home position.

When the wire cleaner moves from the rear to the home position (black arrow in the illustration), the wire cleaner pads clean the wires.

There are no home-position and return-position sensors. The CPU monitors the input voltage (5 V). When the wire cleaner reaches the end, it is stopped and the motor locks. At this time, input voltage slightly decreases (to about 4 V) and the CPU determines when to reverse the motor.

A246/A247/A248 2-22 SM

2.2.4 ERASE

Overview

DRUM UNIT

Detailed

Descriptions

A246D522.WMF

LE: Lead edge erase margin 3.5 ± 2.5 mm SE: Side erase margin total of both sides 3 mm or less LO: Original width LC: Charged width of drum EL: Lead edge erase ES: Side erase

The erase lamp unit consists of a line of 123 LEDs extending across the full width of the drum, the width of each being about 2.5 mm. In editing mode, the customer determines the active LEDs.

SM 2-23 A246/A247/A248

DRUM UNIT

Lead Edge and Trail Edge Erase

The entire line of LEDs turns on when the main motor turns on. They stay on until the erase margin slightly overlaps the leading edge of the original image on the drum (leading edge erase margin). It prevents the shadow of the original leading edge from appearing on the copy paper. This lead erase margin is also necessary for the leading edge of the copy paper to separate from the hot roller. An SP mode can adjust the width of the leading edge erase margin (SP1-2-4).

When the sca nner reaches the return posit ion, the charge corona, the grid bias, and the exposure lamp turn off. However, the charged area on the drum surface is a little longer than the original length in order to capture the entire latent image of the original. The entire line of LEDs turns on when the trail edge of the latent image passes under the erase lamp unit. This prevents developing unnecessary parts of the drum surface; thereby reducing toner consumption and drum cleaning load. The LEDs remain on, erasing the leading edge of the latent image in the next copy cycle. After the final copy, the erase lamps turn off at the same time as the main motor.

Side Erase

Based on the combination of copy paper size and the reproduction ratio data, the LEDs turn on in blocks. This prevents the shadow of the original side edge and unexposed front and rear sides of the drum surface in reduction mode from being developed. This reduces toner consumption and drum cleaning load.

In the DJF mode, the horizontal original standard position on the exposure glass is 5 mm away from the rear scale. On the other hand, the horizontal original standard position on the exposure glass in the platen cover mode is the rear scale edge. One more LED at the front side turns on to erase the shadow made by the edge of the rear scale in platen cover mode. This is in addition to the LEDs that are on in DJF mode.

A246/A247/A248 2-24 SM

2.2.5 CLEANING

Overview

[A]

4 mm

[C]

DRUM UNIT

Detailed

Descriptions

A246D523.WMF

[B]

[D]

A246D524.WMF

This copier uses the counter blade system for drum cleaning. The blade [A] is angled against the drum rotation. This counter blade system has the following advantages:

•

Causes less wear on the cleaning blade edge.

•

Has a high cleaning efficiency.

Due to the high efficiency of this cleaning system, this copier does not use the precleaning corona and cleaning bias.

The cleaning brush [B] supports the cleaning blade. The brush collects toner from the drum surface and the cleaning blade scrapes the toner off the drum. Toner on the cleaning brush is scraped off by the mylar [C] and falls to the toner collection coil [D]. The toner collection coil transports the toner to the toner recycle unit.

To remove the accumulated toner at the edge of the cleaning blade, the drum reverses about 4 mm at the end of every copy job. The cleaning brush removes the accumulated toner by this action.

SM 2-25 A246/A247/A248

DRUM UNIT

Drive Mechanism

[E]

[C]

[A]

[B]

[D]

A246D525.WMF

The timing belt [A] and the cleaning unit coupling [B] transmit drive from the main motor to the cleaning unit drive gear. The cleaning unit drive gear [C] then transmits the drive to the front through the cleaning brush [D]. The gear at the front drives the toner collection coil gear [E].

A246/A247/A248 2-26 SM

Toner Collection Mechanism

DRUM UNIT

[C]

[A]

[B]

A246D527.WMF

The toner collection tube [A] transports toner collected by the cleaning unit to the toner recycle unit.

Drive belts [C] from the main motor drive the toner transport coil [B].

Detailed

Descriptions

SM 2-27 A246/A247/A248

DRUM UNIT

Cleaning Blade Pressure Mechanism and Side-to Side Movement

[C]

[A]

[D]

[B]

A246D526.WMF

The spring [A] always pushes the cleaning blade against the drum. Pushing up the release lever [B] manually releases the cleaning blade pressure. To prevent cleaning blade deformation during transportation, the release lever must be locked in the pressure release (upper) position.

The pin [C] at the rear end of the cleaning blade holder touches the cam gear [D], which moves the blade from side to side. This movement helps to disperse accumulated toner, preventing early wear of the blade edge.

A246/A247/A248 2-28 SM

Pick-off Mechanism

DRUM UNIT

Detailed

Descriptions

[A]

[B]

A246D528.WMF

The pick-off pawls are always in contact with the drum surface because of weak spring pressure. They move from side to side during the copy cycle to prevent drum wear at any particular location. A shaft [A] and a cam [B] create this movement.

SM 2-29 A246/A247/A248

DRUM UNIT

2.2.6 QUENCHING

[A]

A246D530.WMF

In preparation for the next copy cycle, light from the quenching lamp [A] neutralizes any charge remaining on the drum.

The quenching lamp consists of a line of 16 LEDs extending across the full width of the drum.

A246/A247/A248 2-30 SM

DRUM CLEANING AND TONER-RECYCLING

2.3 DRUM CLEANING AND TONER-RECYCLING

2.3.1 TONER TRANSPORT

[A]

[E]

[B]

[F]

[D]

[C]

A246D500.WMF

The toner transport tube transports the toner collected by the drum cleaning [A] and transfer belt [B] units to the toner-recycling unit [C]. The toner transport coil [D] transports the toner. The main motor [E], using timing belts, pulleys, and gears, drives the transport coil. To ensure good toner flow, a fin [F] breaks up the toner that drops from the tube of the drum-cleaning unit.

Detailed

Descriptions

SM 2-31 A246/A247/A248

DRUM CLEANING AND TONER-RECYCLING

2.3.2 FILTERING

[D]

[A]

A246D501.WMF

[D]

[B]

[D]

[B]

[C]

A246D502.WMF

[D]

[E]

A246D503.WMF

A246D504.WMF

The toner collected by the toner transport coil is delivered to the filtering unit [A]. The filtering unit consists of a mesh filter [B] and agitation bar [C]. The re-usable toner passes through the holes in the mesh filter. The agitation bar in the mesh filter prevents the holes in the mesh filter from being blocked. When the coil rotates, the ball [D] stays in the groove in the toner exit coil, and prevents the toner from blocking the holes in the mesh filter.

The unusable material (blocked toner and paper dust) does not pass though the holes in the mesh filter. It exits from the mesh filter and drops into the opening [ E], which leads to the toner collection bottle.

A246/A247/A248 2-32 SM

2.3.3 PUMP MECHANISM

DRUM CLEANING AND TONER-RECYCLING

[A]

[E]

A246D505.WMF

[G]

[B]

[H]

[F]

[G]

Detailed

Descriptions

[B]

[D]

[C]

[D]

[C]

[D]

[C]

A246D506.WMF

The screw in the toner-recycling unit delivers the re-usable toner to the screwpump unit [B] when the toner-recycling clutch [A] is activated. The screw-pump consists of a rotor [C] and stator [D]. The rotor tu rns inside the stator, and the screw-pump transports the toner as shown. The toner recycle motor [E] pushes air into the screw-pump, blowing the toner from the screw-pump into the development unit [G] through the toner-recycling tube [F]. The toner hopper has two air pressure release filters [H] because of the amount of air sent to the toner hopper. When the toner supply clutch remains on for 9.3 seconds or the copying time reaches 60 seconds, whichever comes first, the tonerrecycling clutch turns on for 2 seconds. The air pump motor turns on for 6 seconds at the same time as the toner-recycling clutch.

SM 2-33 A246/A247/A248

DRUM CLEANING AND TONER-RECYCLING

2.3.4 DRIVE MECHANISM

[B]

[D]

[F]

[E]

[A]

[C]

A246D507.WMF

The toner-collection motor [B] drives the exit coil [A] for the toner using gears. The toner-recycling clutch [C] and gears drive the pump-unit. The toner recycle motor [D] supplies air. When the tone r-collection motor locks, the LCD displays an SC345 (tonercollection motor abnormal) message. If the toner recycle motor disconnects for more than one second, the LCD displays an SC346 (toner recycle motor disconnected) error message .

A246/A247/A248 2-34 SM

DRUM CLEANING AND TONER-RECYCLING

2.3.5 TONER COLLECTION BOTTLE

[A]

[B]

Detailed

Descriptions

A246D508.WMF

The set switch [A] for the toner collection bottle detects whether it is set properly. The operation panel indicates when the bottle is not set correctly. The toner overflow sensor [B] detects when the toner collection bottle becomes full. In this condition, the copy job can end, or make up to 100 continuous copies. Then copying is disabled and the LCD displays the service call “full toner collection bottle”. De-actuating and then actuating the set switch for the toner collection bottle can clear this condition.

SM 2-35 A246/A247/A248

SONY B S2 T S Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Product Comparison Chart

TABLE OF CONTENTS

IMPORTANT SAFETY NOTICES

OVERALL INFORMATION

SPECIFICATION

1. OVERALL MACHINE INFORMATION

MACHINE CONFIGURATION

COPY PROCESS AROUND THE DURM

MECHANICAL COMPONENT LAYOUT

DRIVE LAYOUT

PAPER PATH

ELECTRICAL COMPONENT DESCRIPTION

DETAILED DESCRIPTIONS

PROCESS CONTROL

2. DETAILED SECTION DESCRIPTIONS

DRUM UNIT

DRUM CLEANING AND TONER-RECYCLING