Canon GP405, Gp-335 Service Manual DADF-A1

DADF-A1

REVSION 0

DEC. 1998

FY8-13FW-000

IMPORTANT

THIS DOCUMENTATION IS PUBLISHED BY CANON INC., JAPAN, TO SERVE AS A SOURCE OF REFERENCE FOR WORK IN THE FIELD . SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER PRINTED MATTER.

ANY QUESTIONS REGARDING INFORMA TION CONTAINED HEREIN SHOULD BE DIRECTED TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY. THIS DOCUMENT ATION IS INTENDED FOR ALL SALES AREAS, AND MA Y CONTAIN INFORMATION NOT APPLICABLE TO CER TAIN AREAS.

Printed in Japan

Imprimé au Japon

Use of this manual should be strictly supervised to avoid disclosure of confidential information.

Prepared by

OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DEPARTMENT 1

OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DIVISION

CANON INC.

5-1, Hakusan, 7-chome, Toride-City , Ibaraki-Pref ., 302-8501, J apan

INTRODUCTION

This Service Manual provides information needed to service the DADF in the field. This Service

Manual consists of the following chapters:

Chapter 1 “General Description” introduces the DADF’s features and specifications, and

shows how to operate it.

Chapter 2 “Basic Operation” introduces the ADAF’s mechanical and electrical systems; it also

explains the principles used in these systems and the timing at which they are operated with reference to the ADAF’s electrical circuitry.

Chapter 3 “Mechanical System” explains the ADAF’s mechanical construction and how its

parts may be disassembled/assembled and adjusted.

Chapter 4 “Maintenance and Servicing” provides tables of periodically replaced parts and

consumables/durables and scheduled servicing charts.

Chapter 5 “Troubleshooting” provides tables of maintenance/inspection, standards/

adjustments, and problem identification (image fault/malfunction).

Appendix contains a general timing chart and general circuit diagrams.

The descriptions in this Service Manual are subject to change without notice for product improvement or other purposes, and major changes will be communicated in the form of Service Information bulletins.

All service persons are expected to have a good understanding of the contents of this Service Manual and all relevant Service Information bulletins, and be able to identify and isolate faults in the machine.

i

CHAPTER 1

GENERAL DESCRIPTION

I. FEATURES.................................. 1-1

II. SPECIFICATIONS ....................... 1-2

A. DADF-A1....................................1-2

III. NAMES OF PARTS ..................... 1-4

A. Exter nal View .............................1-4

B. Cross Section .............................1-4

IV. OPERATION ................................1-5

A. Original Set Indicator..................1-5

B. Warnings and Actions ................1-5

C. Routine Maintenance

by the User .................................1-6

CHAPTER 1 GENERAL DESCRIPITON

I. FEATURES

1. Two Types of Pick-Up Mode

Top pick-up: Pick-up starts with the top page. Bottom pick-up: Pick-up starts with the bottom page.

2. Stamp Marking

The machine can mark originals with a stamp to indicate that they have been processed for fax

transmission.

3. Original Size Identification

The machine can identify the size of an original in terms of its length (feeding direction) and

width for communication to its host copier.

1-1

CHAPTER 1 GENERAL DESCRIPITON

II. SPECIFICATIONS

A. DADF-A1

Item Original pick-up Original placement 1 Original placement 2

Original pick-up

Original type Original size

Original tray

Delivery tray

Original processing mode

Original size identification

Residual original detection

Continuous feeding Size mix

Communication with copier

Power supply Maximum power

consumption Weight

Dimensions (mm) Serial No.

Operating conditions Temperature Humidity

Specifications Circulating, auto duplexing pick-up method Face up Center reference Top pick-up

Bottom pick-up Sheet (50 to 105 g/m2), single-sided sheet,

double-sided sheet A5/STMT to A3/279×432 mm (11"×17") If small size, 50 sheets, 5.5 mm high max.

(A5, B5, B5R, A4, A4R, STMT, LTR, LTRR) If large size, 25 sheets (B4, A3, LGL,

279×432 mm (11"×17") If small size, 50 sheets (A5, B5, B5R, A4,

A4R, STMT, LTR, LTRR) If large size, 25 sheets (B4, A3, LGL,

279×432 mm (11"×17") Single-sided, double-sided, reduce image

composition Length (feeding direction) and width Possible in conjunction with the host copier.

Possible Possible Possible

IPC 2 24 VDC (from the host copier) 170 W or less

14.1 kg (approx.)

684 (W) × 527 (D) × 161 (H) AB ZLZ xxxxx

INCH/A ZNE xxxxx A ZNF xxxxx INCH/AB ZNG xxxxx

Same as the host copier.

Remarks

See p.2-17. No extra length original.

Paper of 80 g/m2 or less.

For fax processing only. Of the same width only. For fax processing only.

Not including the delivery tray.

1-2

The above specifications are subject to change for product improvement.

Table 1-201

CHAPTER 1 GENERAL DESCRIPITON

Note:

The following must not be used as originals:

• A transparency or paper with an opacity of 80% or less.

• A carbon-backed sheet.

• A sheet with paste-ups or binding.

• A sheet with a cut-off, hole, or tear.

• A sheet with a clip or glue.

• A sheet with curling, wrinkling, or creasing.

Caution:

Do not feed the same original more than 30 times to protect against damage.

1-3

CHAPTER 1 GENERAL DESCRIPITON

III. NAMES OF PARTS

A. External View

[1] [2] [3] [4] [5] [6] [7] [8]

Figure 1-301

[1] Upper cover [2] Side guide [3] Re-circulating guide [4] Original Set indicator [5] Original tray [6] Sub tray [7] Body cover [8] Original delivery tray

B. Cross Section

[1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

[1] Delivery/reversing roller [2] Paper deflecting plate [3] Feeding roller [4] Separation belt [5] Separation flapper [6] Pre-separation guide

[16] [15] [14] [13] [12] [11]

Figure 1-302

[7] Delivery/pick-up roller [8] Paper retaining plate [9] Pick-up roller [10] Delivery roller [11] Feeding belt link roller [12] Retaining rolls

[13] Feeding belt [14] Paper stopper plate [15] Feeding belt drive roller [16] Registration roller

1-4

CHAPTER 1 GENERAL DESCRIPITON

IV. OPERATION

A. Original Set Indicator

The Original Set indicator turns on when an original is placed on the original tray, and flashes when an original jams.

A4/B5

A3/B4

Figure 1-401

Operation

1) If the original is B5R or larger or is A5 in

feeding length, open the original sub tray.

2) Set the side guide to suit the size of the

original.

B. Warnings and Actions

If the Original Set indicator flashes while an original is being fed, suspect a jam and perform the following:

1) Remove the originals from the original

tray.

2) Open the upper cover, and remove the jam.

Then, open the DADF to reset the

warning. (If any original is on the

copyboard glass, remove it.)

Caution:

If the jam is in the copier, the copier will run jam recovery mode and will automatically set the originals. Do not open the DADF to reset.

3) Set the originals in correct order, and set

the stack in the DADF.

Reference:

The side guide lock must be removed if the width of the original is larger than 297 mm (A4/A3). For details, see 3. “Side Guide Lock” on p. 3-3.

3) Place the originals with the first page on top.

4) As needed, set the appropriate copying mode on the copier.

5) Press the copier’s Copy Start key.

1-5

CHAPTER 1 GENERAL DESCRIPITON

C. Routine Maintenance by the User

Instruct the user to clean the following at least once a week:

1. Copyboard Glass

Wipe it with a cloth moistened with water or alcohol; then, dry-wipe it.

2. Feeding Belt

Wipe it with water or alcohol.

3. Other Parts

Clean all other parts of the DADF (if soiled) using a solution of mild detergent; then, dry-wipe

them to remove any residue.

4. Feeding Belt and Feeding Roller

Execute cleaning mode in the copier’s user mode.

5. Stamp

If markings start to be fuzzy, replace the stamp using tweezers.

Stamp

Tweezers

Figure 1-402

Caution:

Do not touch the stamp face. If your skin has come into contact with its ink, be sure to wash it with water immediately.

1-6

CHAPTER 2

BASIC OPERATION

I. BASIC CONSTRUCTION ............2-1

A. Outline of the Electrical

Circuitry ......................................2-1

B. Communication with the Copier .2-2 C. Inputs to the D ADF

Controller PCB ........................... 2-3

D. Outputs to the DADF Controller PCB

....................................................2-5

II. BASIC OPERATION .................... 2-6

A. Outline ........................................ 2-6

B. Operation .................................... 2-7

C. Detecting Originals ................... 2-12

D. Picking Up Originals ................ 2-17

E. Reversal ................................... 2-25

F. Reduced Page Composition .... 2-27

G. Delivery .................................... 2-34

H. Stamping Function ................... 2-40

I. Controlling the Pick-Up Motor ..2-43

J. Controlling the Belt Motor.........2-45

K. Detecting Original Jams ...........2-47

L. Improper Placement of

Originals ...................................2-50

III. POWRE SUPPLY ...................... 2-53

A. Outline ...................................... 2-53

CHAPTER 2 BASIC OPERATION

I. BASIC CONSTRUCTION

A. Outline of the Electrical Circuitry

The machine’s electrical mechanisms are controlled by the DADF controller PCB. A microprocessor (CPU) is used on the DADF controller PCB, and the microprocessor reads the input signals from the sensors and the copier and generates signals used to drive DC loads (motors, solenoids) at such times as programmed in advance.

DADF controller PCB

Sensor

V ariable

resistor

CPU

(Q1)

ROM

(Q2)

RAM

(Q4)

Communication

IC(Q3)

24V

Power supply

5 VDC power supply

J2-1

circuit

5V

J1-6

Motor

Solenoid

Clutch

Brake

Indicator LED PCB

Motor

Copierk

Figure 2-101

2-1

CHAPTER 2 BASIC OPERATION

B. Communication with the Copier

The operation modes selected on the copier are communicated to the machine in an IPC communication method. Likewise, the operation states of the machine are communicated to the copier in an IPC communication.

If an error occurs in the IPC communication, the copier’s self diagnosis function turns on to indicate “E400” or “E712” on its control panel.

RSOUT

Communication

IC

RSIN

Communication

IC

CPUCPU

Copier DADF

Figure 2-102

2-2

DADF switch

MS1

MS2

S1

J203

J205

LED3

S3

S4

S5

S6

S7

J212

COM J2-3

+24V

+5V

RFC

EMPS

ENTS

CVRSW

DCTS

EJTS1

SPRS

UPCC1

-4

1-2

J5-7

J9-B10

-B9

-B12

J9-B6

J5-3

J9-A1

J9-A4

-A6

-A5

-A3

-A2

-1

-2

-B8

-B7

-B11

-8

-9

3

1 21

3 1 2

3

J207

J208

1 2

3 1

2

3 1

2

3 1

2

1 3

2

1 3

2

3 1

2

41

2

J3-

NO

COM NO

Upper cover switch

Original tray paper sensor

Registration paper sensor

Upper cover sensor

Pick-up roller sensor

Delivery sensor 1

Pick-up sensor

DADF controller PCB

When the RDF is open, '0'.

When the upper cover is open, '0'.

When an original blocks the sensor, '1'.

When the upper cover is open, '0'. (The light-blocking plate is at the sensor.)

When the pick-u roller is at the home position, '1'. (The light-blocking plate is at the sensor.)

When an original is detected, '1'. (The light-blocking plate is at the sensor.)

C. Inputs to the DADF Controller PCB

1. Inputs to the DADF Controller PCB (1/2)

CHAPTER 2 BASIC OPERATION

Figure 2-103

2-3

CHAPTER 2 BASIC OPERATION

2. Inputs to the DADF Controller PCB (2/2)

DADF controller PCB

Reversal sensor S8

Feeder motor

S9

clock sensor

Belt motor

S10

clock sensor

Registration roller

S11

clock sensor

Delivery sensor 2 S12

J209

3 1 2

1 2 3

3 1 2

1 3 2

J219

3 1 2

J9-A7

-A9

-A8

J9-A12

-A11

-A10

J9-B5

-B4

-B3

J5-4

-5

-6

J14-4

-6

-5

+5V

TURNS

+5V

FCLK

+5V

BCLK1

+5V

RCLK

+5V

EJTS2

When an original is detected, '1'. (When the light-blocking plate is at the sensor.)

While the feeder motor is rotating, alternates '1' and '0'.

When an original is detected, '1'. (When the light-blocking plate is at the sensor.)

Delivery motor clock sensor

Re-circulation sensor

Original width detecting VR

S13

Display PCB

S14

J219

1

3

2

3

1

J101-3

-2

-1

J218

3 2 1

J14-3

4

-2

5

-1

6

J8-3

-2

-1

1

J8-7

2

-8

3

-9

+5V

ECLK

+5V

RSS

+5V

WIDTH

While the delivery motor is rotating, alternates '1' and '0'.

When the re-circulation bar is set on the top original, '1'.

Detects the width of the original stacked on the original tray.

2-4

D. Outputs to the DADF Controller PCB

1. Outputs to the DADF Controller PCB (1/1)

CHAPTER 2 BASIC OPERATION

Stopper plate solenoid

Paper retaining plate solenoid

Paper deflecting plate solenoid

Stamp solenoid

Clutch

Brake

Pick-up motor

SL1

SL2

SL3

SL4

CL

BK

M1

2

1

2

1

2

1

J217

J216

J220

STPSL

WGTSL

FLPSL1

SMPSL

+24V

When '0', the solenoid (SL1) turns on. (The stopper plate moves down.)

+24V

When '0', the solenoid (SL2) turns on. (The paper retaining plate moves down.)

+24V

When '0', the solenoid (SL3) turns on. (The paper deflecting plate operates.)

+24V

When '0', the solenoid (SL4) turns on. (The stamp puts a marking on the

1

2

1

2

1

2

J5-10

-11

J5-12

-13

J9-B2

-B1

J14-9

-10

original.)

J13-1

-2 J6-1

-2

J12-1

-2

J11-1

+24V

CL

+24V

BK

See p. 2-43.

+24V

When '0', the clutch (CL1) turns on.

When '0', the brake (BK1) turns on.

Feeder motor

Belt motor

Re-circulation motor

Delivery motor

M2

M3

J102-1

M4

-2

Display PCB

M5

J101 -5

LED101

LED102

J221

3

2

-6

J101-4

1

2

FMPWM

-2

J7-1

-2

J8-5

RSDRV

-6

J14-8

-7

-3

ORGLED

-4

EMPWM

-3

When '0', the feeder motor (M2) turns on.

See p. 2-45.

+5V

When '0', the re-circulation motor (M4) turns on.

+5V

When '0', the Original Set indicator turns on.

+24V

When '0', the delivery motor (M5) turns on.

2-5

CHAPTER 2 BASIC OPERATION

II . BASIC OPERATION

A. Outline

The machine uses four motors and one clutch to pick up, feed, and deliver originals.

The pick-up motor (M1) serves to pick up originals. The feeder motor (M2) serves to reverse and deliver originals. The belt motor (M3) moves and stops originals to and on the copyboard glass, and delivers them. The delivery motor (M3) operates to deliver originals to the delivery tray.

The clutch (CL) is used to engage or disengage the drive of the feeder motor (M2) and the belt motor (M3).

DADF controller PCB

Belt motor clock signal

Feeder belt brake drive signal

Belt motor drive signal

Clutch drive signal

Feeder motor clock signal

S9

S10

Delivery detection signal 1

Reversal/feeder paper detection signal

Feeder motor drive signal

M2

CL

Paper deflecting plate solenoid drive signal

SL3

S6

S8

BK M3

Pick-up registration signal

S7

S3

S11

Pick-up paper detection signal

S1

Original tray paper signal

Pick-up roller home position detection signal

Upper cover open/closed detection signal 2

S4

S5

SL1

Stopper plate solenoid drive signal

Paper holding solenoid drive signal

SL2

M1

Registration roller clock signal

Last original detection signal

Indicator

S14

Delivery motor clock signal

Original set indicator ON signal

Re-circulator motor drive signal

PCB

S13

Pick-up motor drive signal

M4

M5

S12

SL4

Delivery detection signal 2

Delivery motor drive signal

Stamp solenoid drive signal

2-6

Figure 2-201

CHAPTER 2 BASIC OPERATION

B. Operation

The machine enables the following six

operations:

1. Bottom pick-up

2. Double-sided original to single-sided copy

3. 2 small-size originals to reduced page composition

4. Single-sided original to double-sided copy

5. Double-sided original to double-sided copy Using auto duplexing unit.

6. Top pick-up mode original feeding

The machine feeds originals in any of

the following five ways according to the instructions from the copier:

1. Bottom Pick-Up Mode

The machine picks up the originals on the original tray from the bottom (last page of the stack), and places each on the copyboard glass.

After copying, it moves the original from the copyboard glass to the original tray.

Original

Original tray

Original set

Pick-up 2

Copying

Delivery 1

Delivery 2

Figure 2-202

2-7

CHAPTER 2 BASIC OPERATION

2. Double-Sided Original Mode

When copying the face (1st side) and the back (2nd side) of an original, the machine

automatically reverses the original.

Pick-Up Operation

Picks up an original for the 1st side.

Reverses the original from the 1st side

to the 2nd side.

Scanner

Reverses the original from the 2nd side to the 1st side.

Copies the 2nd side.

Copies the 1st side.

2-8

Delivers the original.

Figure 2-203

CHAPTER 2 BASIC OPERATION

3. Reduced Page Compositon Mode

When reducing and copying two originals in page composition mode, the machine automatically picks up two originals and places them on the copyboard glass side by side. Table 2-201 shows the sizes of originals that may be used in the machine.

1st original

Picks up the 1st original.

A/B-configured

A5 B5 A4

Table 2-201

2nd original

INCH-configured

STMT

LTR

–

Reverses the original from the 1st side to the 2nd side.

Picks up the 2nd original

While reversing the 1st original, picks up the 2nd original. (At this time, the order of originals is switched.)

Feeds the 2nd original and the 1st original.

Copying

1st original

2nd original

Delivers the 1st original, and delivers the 2nd original.

Figure 2-204

2-9

CHAPTER 2 BASIC OPERATION

4. Top Pick-Up Feeding

The machine picks up the originals on the original tray from the top (first page of the stack), and places them on the copyboard glass.

Each time an original has been read, the machine moves the original from the copyboard glass to the original delivery tray.

Placement

Pick-up

Reading

Delivery 1

Delivery 2

2-10

Figure 2-205

CHAPTER 2 BASIC OPERATION

5. Recirculating Mode

If the copier is not equipped with a sorter, this mode enables sorting of copies. Originals are copied one after another until one set of copies have been made; and this operation is repeated until as many sets as desired have been made.

Operation

1) Set originals on the original tray.

2) Select sort mode on the copier.

3) Enter a number (of sets) on the copier’s keypad.

4) Press the Copy Start key.

2-11

CHAPTER 2 BASIC OPERATION

C. Detecting Originals

1. Outline

The machine has the following four types

of document detection:

1. Detects the presence/absence of an original on the original tray.

2. Detects the size of originals place on the original try.

3. Detects the number of originals that have been copied.

4. Detects the trailing edge of the last original.

2. Detecting the Presence/Absence of an Original

The presence/absence of an original on the

original tray is detected by the original tray paper sensor (PS1).

When an original is set on the original tray,

the light between the original tray paper sensor (S1) and the prism is blocked, causing the original tray paper sensor (S1) to generate the original detection signal (EMPS).

In response to the original detection signal

(EMPS), the DADF controller PCB turns on the Original Set indicator (LED101, LED102).

Original Set indicator

Original

Original tray

Figure 2-207

DADF controller PCB

LED 101,102

Prism

Original

S1

S11

Figure 2-206

Original Set

indicator ON

signal

Indicator

PCB

Original tray paper signal

2-12

CHAPTER 2 BASIC OPERATION

3. Detecting the Size of an Original

a. Outline

The machine detects the size of an original in relation to the vertical (feeding) and horizontal directions of the original, ensuring correct size detection and for use for the communication protocol of fax mode.

b. Detecting in Vertical (feeding)

Direction

Detection in vertical direction is made by the registration paper sensor (S3) and the registration roller clock sensor (S11).

The registration paper sensor detects the leading and trailing edges of an original, and the registration roller clock sensor detects the rotation of the registration roller while the original moves past the sensor. The rotation of the registration roller is converted to the length of the original.

DADF controller PCB

c. Detection in Horizontal Direction

Detection in horizontal direction is made by the original width detecting volume (VR) on the original tray. The original width detecting volume operates in conjunction with the side guide. As its resistance varies, the changes are detected by the DADF controller PCB, which converts them into a length in horizontal direction.

Side guides

VR

DADF controller PCB

Figure 2-209

Registration paper sensor

Registration roller

Pick-up detection signal

Registration roller clock signal

Registration roller clock sensor

Figure 2-208

2-13

CHAPTER 2 BASIC OPERATION

The copier identifies the size of an original in terms of a default size based on the results of vertical and horizontal lengths communicated by the machine.

Table 2-202 shows the default sizes that are identified:

d. A Model, A/B Model

Default

B5R

A5

A4R

FOOLSCAP

B5 B4

COMPUTER

paper

A4 A3

Vertical length

257mm

148.5mm 330mm 330mm 182mm 364mm

381mm 210mm

420mm

Original width

177~187mm

205~215mm

252~262mm

274~284mm

292~302mm

f. Inch Model and Inch/AB Model

Default

B5R

A5

A4R STMT LTRR

FOOLSCAP

LGL

B5 B4

LTR

COMPUTER

paper

279mm×432mm

(11"×17")

A4 A3

Original

length 257mm 148mm 297mm 140mm 279mm 330mm 356mm 182mm 364mm 216mm

381mm

432mm 210mm

420mm

Original

width

177~187mm 205~213mm

214~221mm

252~262mm

274~284mm

For vertical direction, a deviation of ±10 mm is ignored; for horizontal direction, a deviation of ±5 mm is ignored; outside the ranges, the original will be identified as being of a non-default size.

Table 2-202

e. Inch Model

Default

STMT LTRR

FOOLSCAP

LGL LTR

COMPUTER

paper

297mm×432mm

(11"×17")

Original

length 140mm 279mm 330mm 356mm 216mm

381mm

432mm

Original

width

211~221mm

274~284m

For original length, a deviation of ±10 mm is ignored; for original width, a deviation of ±5 mm is ignored; outside the ranges, the original will be identified as being of a non-default size.

Table 2-204

In vertical direction, a deviation of ±10 mm is ignored; in horizontal direction, a deviation of ±5 mm is ignored; outside the ranges, the original will be identified as being of a nondefault size.

Table 2-203

2-14

CHAPTER 2 BASIC OPERATION

4. Detecting the Number of Originals

The number of originals is detected in terms of “stack end detection,” “last original rear edge detection,” and “original count detection.”

a. Detecting the End of a Stack

The machine picks up and delivers originals on the same tray, requiring distinction of originals that have been copied from originals that have not been copied.

Before picking up originals, the recirculating lever is placed on top of the stack. The lever will drop on the original tray when all originals have been picked up, enabling the re-circulation sensor (S14) to identify the last original and to generate the last original detection signal (RSS).

DADF controller PCB

Recirculating lever

b. Detecting the Trailing Edge of the Last

Original

A copier with a long paper path (from the cassette to the drum) is designed to pick up copy paper early to speed up copying work. As such, when the machine picks up the last original and places it on the copyboard glass, the next paper is likely to be kept in wait.

To accommodate this, the machine is designed to pick up originals to suit the timing at which its host copier picks up copy paper.

If the length of an original is 220 mm or less, the machine sets the first original on the copyboard glass, and moves the second original beyond the registration roller.

Recirculating lever

DADF controller PCB

Re-circulating lever

Figure 2-210

Original

RSS

Re-circulation sensor (S14)

2nd original

Figure 2-211

If the re-circulating lever is on the original tray in this condition, the machine communicates to the copier that the third and subsequent originals are present, and the copier picks up copy paper for the next copying run.

When the re-circulating lever has dropped on the original tray, the machine communicates to the copier that there is not third or subsequent originals (RSS signal) so that the copier will not pick up copy paper.

2-15

CHAPTER 2 BASIC OPERATION

c. Original Count Detection

The machine need not count originals when making single-sided copies of singlesided originals, signal-sided originals of double-sided originals, or double-sided copies of double-sided originals; as such, it merely feeds the originals on the original tray in sequence.

When making double-sided copies of signal-sided originals, however, the machine must find out whether there is an odd or even number of originals.

Holding the copier from making copies, the DADF picks up and delivers the originals to find out how many there are.

Reference:

The machine can pick up the last page of originals first. When making doublesided copies of single-sided originals, it must decide whether the last page must be on the face or back of a sheet (odd or even page). Figure 2-212 shows what would happen if an odd number originals were fed without control. (The first page would be copied on the back of a sheet.)

1

2

3

1

2

3

Copier

Figure 2-212

On some copiers, you can disable original count operation in user mode.

2-16

CHAPTER 2 BASIC OPERATION

D. Picking Up Originals

1. Outline

The machine picks up originals in either of the following two ways, each characterized by its

own method:

1. Top pick-up (starting with the top of a stack of originals; top separation)

2. Bottom pick-up (starting with the bottom of originals; bottom separation) In bottom pick-up mode, the last page of the stack of originals on the original tray is picked up

first; on the other hand, in top pick-up mode, the first page will be picked up first.

Top pick-up mode

Figure 2-213

Bottom pick-up mode

Figure 2-214

2-17

CHAPTER 2 BASIC OPERATION

2. Configuring the Pick-Up Assembly

The construction of the pick-up assembly is changed by the pick-up motor (M1). When the pickup motor rotates clockwise, the construction will be made ready for bottom pick-up mode; when the motor rotates counterclockwise, on the other hand, the assembly will be made ready for top separation.

When the pick-up motor starts to rotate clockwise, the arm on the pick-up roller shaft transmits its drive to the original guide and the switching arm. In response, the original guide moves up; the rear and the front of the separation belt operating in connection with the switching arm move down to switch the construction of the pick-up assembly for bottom pick-up mode.

When the pick-up motor starts to rotate counterclockwise, the arm on the pick-up roller shaft transmits its drive to the original guide and the switching arm. In response, the original guide moves downward. On the other hand, the rear and the front of the separation belt operating in connection with the switching arm moves upward to change the construction of the pick-up assembly for top pick-up mode.

DADF controller PCB

Original guide

Separation belts

Figure 2-215 Bottom Pick-Up Mode

Switching

arm

DADF controller PCB

Original guide

Pick-up motor (M1)

M1

Arm

Pick-up motor (M1)

M1

2-18

Separation belts

Switching arm

Arm

Figure 2-216 Top Separation Mode

3. Bottom Pick-Up Mode

Arch

Registration roller

a. Operation

When the Copy Start key is pressed while originals are set on the originals tray, the following takes place:

1) Pick-Up Separation

The pick-up stopper plate is brought down

to move down the paper retaining plate on

the stack of originals, and the last page of

the stack is picked up.

Note that, after pick-up, the original is

moved between the separation belt and the

feeding roller to prevent double feeding.

CHAPTER 2 BASIC OPERATION

Paper retaining plate

Separation belt

Paper stopper plate

Feeding roller

Caution:

The paper retaining plate is always brought down when picking up the first original. For the second and subsequent originals, the retaining plate is brought down only when pick-up fails because of slips (of the pick-up roller) or the like (i.e., the pick-up sensor S7 does not detect an original within 500 msec after the pick-up sensor has turned on) so as to improve feeding performance.

2) Arching

The original is butted against the

registration roller so that it arches.

Pick-up sensor (S7)

Figure 2-217

Figure 2-218

2-19

CHAPTER 2 BASIC OPERATION

3) Feeding The feeding belt, registration roller, and feeding roller are rotated to move the original to the copyboard glass.

Feeding roller

4) Picking Up the 2nd Original When the original reaches a specific point on the copyboard glass, the copier’s scanner starts to move forward. At the same time, the second original is picked up (if of small size).

Small size

Large size

A5,B5,B5R,A4,A4R STMT,LTR,LTRR

B4,A3,LGL 279mm×432mm(11"×17")

Registration roller

Figure 2-219

Edged out by the registration roller

Figure 2-220

Feeding belt

Scanner

Table 2-205

Caution:

In case of small-size originals, the second and subsequent originals are “edged out” by the registration roller so as to reduce feeding time.

2-20

CHAPTER 2 BASIC OPERATION

b. Sequence of Operations (A4, 2 originals, bottom pick-up)

Original set Copy Start key ON

Pick-up sensor Registration

paper sensor

Reversal sensor Delivery sensor 1 Pick-up motor Feeder motor

Belt motor

Clutch

Paper stopper plate solenoid

Paper retaining plate solenoid

Brake

(S7)

(S3)

(S8)

(S6)

(M1)

(M2)

(M3)

(CL)

(SL1)

(SL2)

(BK)

Original

picked up

Original fed

Arching

Scanner started/

2nd sheet picked up

Fed/

Delivered

CW CCW

Scanner

started

CWCCWCW

Low-speed Feeding belt CW rotation Feeding belt CCW rotation

Table 2-221

2-21

CHAPTER 2 BASIC OPERATION

4. Top Pick-Up Mode

a. Operation

When top pick-up mode is executed with

originals on the original tray, the following will take place:

1) Pick-Up Separation The paper stop plate is brought down, and the paper retaining plate is moved down to the stack of originals; then, the first page of the stack is picked up. After pick-up, the original is fed between the separation belt and the feeding roller to prevent double feeding. (The direction of rotation of the separation belt and the feeding roller is the opposite of the direction in bottom pick-up mode.)

Separation belt

Paper retaining plate

Paper stopper plate

Feeding roller

Pick-up sensor

Figure 2-222

1st page of the stack

2) Arching The original is butted against the registration roller so that it arches.

Arching

Registration roller

Figure 2-223

2-22

3) Feeding

Registration roller

Feeding roller

Feeding belt

Edged out by the registration roller.

Scanner

The feeding belt, registration roller, and feeding roller are rotated to move the original to the copyboard glass.

4) Picking Up the 2nd Original When the original reaches a specific position on the copyboard glass, the copier’s scanner starts to move forward. At the same time, the 2nd original is picked up (if of small size). In the case of a large-size original, the 2nd original is picked up after delivery of the first original.

CHAPTER 2 BASIC OPERATION

Figure 2-224

Figure 2-225

2-23

CHAPTER 2 BASIC OPERATION

b. Sequence of Operations (A4, 2 originals, top pick-up mode)

Copy Start key ON

Pick-up sensor

Registration paper sensor

Delivery sensor 2 Pick-up motor

Feeder motor

Belt motor Clutch

Brake

Stamp solenoid

Paper retaining plate solenoid

Stopper plate solenoid

1st original picked up, fed

(S7) (S3)

(S7) (M1) (M2) (M3)

CW CCW CCW CCW

(CL) (BK)

(SL4) (SL2) (SL1)

The pick-up motor rotates in the direction opposite to the direction in copying mode. The feeding belt rotates clockwise.

CW CCW

The feeding belt rotates counterclockwise.

Low speed

Scanner started,

2nd original picked up

2nd original fed

Low speed Low speed

Scanner

forward

Figure 2-226

2-24

E. Reversal

Picking up for the 1st side.

1. Operation

Reversal is executed only in bottom pickup mode; it may be either from the first side to the second side, or from the second side to the first side. (Since the same mechanism is involved, the discussions herein will be on reversal from the first side to the second side.)

1) Picking Up for the 1st Side

An original is moved from the original tray

to the copyboard glass.

2) Reversal/Feeding

The feeding belt is rotated

counterclockwise to reverse/feed the

original on the copyboard glass.

CHAPTER 2 BASIC OPERATION

Figure 2-227

3) Reversal/Delivery Switching

The paper deflecting solenoid (SL3) is

turned on to open the paper deflecting plate

so that the original is moved back to the

copyboard glass, reversing the original.

When the second side of the original is set

on the copyboard glass, the scanner starts

to move forward.

While the scanner is moving in reverse, the

original is reversed once again so that its

first side is set on the copyboard glass.

When the 1st side of the original has been

copied, the original is moved for delivery.

Paper deflecting plate

Reversing from the 1st side to the 2nd side.

Figure 2-228

Figure 2-229

2-25

CHAPTER 2 BASIC OPERATION

2. Sequence of Operations (reversal)

Pick-up sensor Registration

paper sensor Reversal sensor Delivery sensor 1 Pick-up motor Feeding motor

Belt motor

Paper deflecting plate solenoid

Clutch Brake

1st side picked up

(S7) (S3) (S8)

(S6) (M1) (M2) (M3)

(SL3)

(CL) (BK)

1st side

1st side reversed

copied

CCW CCW CCWCW CW

2nd side

copied

Low speed Low speed

Reversed/fed

CW : The feeding belt rotates CW. CCW : The feeding belt rotates CCW.

3rd side

copied

Figure 2-230

2-26

F. Reduced Page Composition

1st original

4th original 3rd original 2nd original

Delivery/reversing roller

1st original

Feeding belt

1. Operation

In reduced page composition mode, operations differ between bottom pick-up and top pick-up.

When a mode is picked up and the Copy Start Key is pressed, pick-up operation takes place as follows:

The originals are picked up starting with the last original, requiring reordering. The machine takes advantage of its reversing mechanism to reorder originals.

2. Bottom Pick-Up Mode

1) Picking Up the 1st Original

The 1st original is picked up, and is placed on the copyboard glass. For details, see D3 “Pick-Up in Bottom Pick-Up Mode” on p. 2-19.

CHAPTER 2 BASIC OPERATION

Figure 2-231

2) Feeding the 1st Side The feeding belt is rotated clockwise to move the original on the copyboard glass to the delivery/reversing roller.

Figure 2-232

2-27

CHAPTER 2 BASIC OPERATION

3) Reversing the 1st Original/Delivery Switching The paper deflecting solenoid (SL3) is turned on to open the paper deflecting plate so that the 1st original is moved back to the copyboard glass.

4) Separating the 2nd Original/Feeding the 1st Original The paper deflecting plate solenoid (SL3) is turned on to open the paper deflecting plate. The 2nd original is picked up, and is stopped as the registration roller. At the same time, the feeding belt is rotated clockwise to move the 1st original to the delivery/reversing roller.

Paper deflecting plate

Figure 2-233

2nd original

Paper deflecting plate

Delivery/reversing roller

1st original

Registration roller

1st original

Feeding belt

5) Feeding the 1st and 2nd Originals Simultaneously The clutch (CL) is turned on, and the difference in speed between the delivery/ reversing roller and the feeding belt is eliminated, thereby feeding two originals simultaneously. At this time, the order of originals is changed, and the sheet-to-sheet distance is adjusted while making a width of overlap.

Figure 2-234

Delivery/reversing roller

Figure 2-235

Feeding belt

2-28

Overlap

Figure 2-236

6) Adjusting the Sheet-to-Sheet Distance The clutch is turned off, and the feeding belt is rotated slowly counterclockwise, eliminating the overlap of two originals and, as a result, adjusting the sheet-tosheet distance.

7) Feeding

CHAPTER 2 BASIC OPERATION

Feeding belt

After the sheet-to sheet distance between two originals is adjusted to a specific value, the clutch (CL) is turned on to eliminate the difference in speed between the delivery/ reversing roller and the feeding belt; then, the two originals are moved to the copyboard glass.

Delivery/reversing roller

Sheet-to-sheet distance

Figure 2-237

Feeding belt

Sheet-to-sheet distance

Figure 2-238

8) Delivering the 1st Original After copying, the feeding belt is rotated clockwise slowly, and the 1st original is pulled by the delivery/reversing roller and delivered.

Delivery/reversing roller

1st original

Feeding belt

2nd original

Reference:

At this time, the leading edge of the 2nd original is moved to and stopped at the

Figure 2-239

index on the horizontal size plate.

2-29

CHAPTER 2 BASIC OPERATION

9) Separating the 3rd Original The 3rd original is picked up and stopped at the registration roller.

10) Feeding the 2nd Original The feeding belt is rotated clockwise slowly to move the 2nd original to the delivery/reversing roller.

3rd original

Registration roller

Figure 2-240

Delivery/resign roller

Feeding Belt

11) Delivering the 2nd Original and Picking Up the 3rd Original The clutch (CL) is turned on to eliminate the difference in speed between the delivery/reversing roller and the feeding roller; the 2nd original is delivered, and the 3rd original is picked up and stopped on the copyboard glass. The rest is the same as the operations starting with step 1; if no more original (3rd, 4th) exists, the 2nd original is delivered after delivering the 1st original.

2nd original

Figure 2-241

2nd original

Feeding belt

3rd original

Delivery/reversing roller

Figure 2-242

1st original

2-30

2nd Original

Figure 2-243

CHAPTER 2 BASIC OPERATION

3. Sequence of Operations (reduced page composition mode; bottom pick-up)

Pick-up sensor

Registration paper sensor

Reversal sensor

Delivery sensor 1

Pick-up motor Feeder motor Belt motor

Clutch Brake

Paper deflecting plate solenoid

(SL3)

(S7) (S3) (S8)

(S6) (M1) (M2) (M3)

(CL) (BK)

1st original

picked up

CCW CCW CCW CCW CCW CCWCW CW CW CWCW

1st original reversed 2nd/1st original fed Copied

Sheet-to-sheet distance adjustment

Low-speed rotation. The feeding belt rotates clockwise.

CW

The feeding belt rotates counterclockwise.

CCW

1st/2nd original delivered, 3rd original

picked up, 4th original, separated

Figure 2-244

2-31

CHAPTER 2 BASIC OPERATION

4. Top Pick-Up

In top pick-up mode, the originals are picked up starting with the top sheet, not requiring reordering of the originals unlike bottom pick-up mode.

1) Picking Up the 1st Side

The 1st original is picked up and stopped

on the copyboard glass. For details of pick-

up operation, see D-4 “Top Pick-UP” on

p. 2-22.

2) Positioning the 1st Side Original/Feeding

the 2nd Side Original

The 1st original is moved back to adjust the

sheet-to-sheet distance. Further, two

originals are moved simultaneously and

stopped at specific positions.

2nd original

1st original

Figure 2-245

3) Feeding the 1st Side and 2nd Side

Originals Simultaneously

The clutch (CL) is turned on to eliminate the difference in speed between the delivery/reversing roller an the feeding belt, and two originals are fed simultaneously.

Figure 2-246

Figure 2-247

2-32

CHAPTER 2 BASIC OPERATION

4) Delivering the 1st and 2nd Originals When the original has been read, the feeding belt is rotated counterclockwise, and the 1st and 2nd originals are delivered.

If there are 3rd and 4th originals, pick-up

is started.

Figure 2-248

5 Sequence of Operations (reduced page composition; top pick-up)

Copy Start key ON

Pick-up sensor

Registration paper sensor

Delivery sensor 2 Pick-up motor

Feeder motor

Belt motor

Clutch Brake

Paper retaining solenoid

Delivery motor

1st original picked up/fed

(S7) (S3)

(M1) (M2) (M3)

CW CWCCW CCW CCW CCW

(CL)

(BK)

(SL2)

(M5)

The pick-up motor rotates in the direction opposite of copying mode.

CW

The feeding belt rotates clockwise.

CCW

The feeding belt rotates counterclockwise.

Low speed

2nd original picked up/fed

Low speed Low speed

Scanner started

Low speed

Delivered

Low speed

Figure 2-249

2-33

CHAPTER 2 BASIC OPERATION

G. Delivery

1. Outline

The machine delivers originals in either of the following two modes:

1. Bottom pick-up mode

2. Top pick-up mode In the case of bottom pick-up mode, the machine delivers the original to the original tray; in the

case of top pick-up mode, it delivers the original to the original delivery tray.

Original tray

Figure 2-250 Bottom Pick-Up Mode

Original delivery tray

Figure 2-251 Top Pick-up Mode

2-34

Delivery/reversing roller

Feeding roller

Reversal sensor (S8)

Paper deflecting plate

Original tray

2. Bottom Pick-Up Mode Delivery

a. Operation

The machine delivers an original on the

copyboard glass to the original tray as follows:

1) Feeding Belt Delivery The feeding belt is rotated clockwise to move the original from the copyboard glass for delivery.

CHAPTER 2 BASIC OPERATION

Feeding belt

Scanner

Figure 2-252

2) Delivery/Reversing Roller Delivery

Reference:

When the leading edge of an original is moved about 15 mm from the reversal sensor (S8), the feeding belt starts to rotate counterclockwise to be ready for the next pick-up operation.

3) Delivery/Reversal Switching

The original fed by the feeding belt is moved farther between the delivery/ reversing roller and the feeding roller. In the case of a small-size original, two originals are picked up simultaneously.

The paper deflecting plate solenoid (SL3) is off and, therefore, the paper deflecting plate remains closed, moving the original to the original tray as a result. The next original is picked up and moved to the copyboard glass.

Figure 2-253

Figure 2-254

2-35

CHAPTER 2 BASIC OPERATION

4) Original Tray Delivery When the trailing edge of an original leaves the delivery roller, the rotation of the feeder motor switches to low speed, slowly delivering the original.

Scanner

Figure 2-255

b. Sequence of Operations (large-size and mix size mode; 2nd original pick-up/delivery)

Pick-up sensor

Registration paper sensor

Reversal sensor

Delivery sensor 1

Pick-up motor

Feeder motor

Belt motor Clutch Brake

(S7) (S3) (S8)

(S6) (M1) (M2) (M3)

(CL)

(BK)

1st original

deliveried

2nd original picked up,

2nd original separated

Arching

CCW CW

2nd original

copied

2nd original delivered

Figure 2-256

Low speed

CW

The feeding belt rotates clockwise.

CCW

The feeding belt rotates couuterclockwise.

2-36

CHAPTER 2 BASIC OPERATION

c. Sequence of Operations (small size; continuous pick-up/delivery)

Pick-up sensor Registration

paper sensor

Reversal sensor

Delivery sensor Pick-up motor Feeder motor

Belt motor

Clutch

Brake

Scanner forward/

3rd original separated

2nd original copied

(S7) (S3) (S8)

(S6) (M1) (M2) (M3)

(CL) (BK)

2nd original delivered/

3rd original picked up

CW CWCCW CCW

Scanner moved forward/

4th original separated

3rd original copied

3rd original delivered/ 4th original picked up

The feeding belt rotates clockwise.

CW

The feeding belt rotates counterclockwise.

CCW

Figure 2-257

d. Sequence of Operations (small size, delivery)

Staggered for delivery Original delivered/separated

Pick-up sensor

Registration paper sensor

Reversal sensor Delivery sensor Pick-up motor

Feeder motor Belt motor Clutch Brake

Paper stopper plate solenoid

(S7)

(S3)

(S8)

(S6) (M1) (M2) (M3) (CL) (BK)

(SL1)

CW CCW

Copied

Low speed The feeding belt rotates clockwise.

CW

The feeding belt rotates counterclockwise.

CCW

Figure 2-258

2-37

CHAPTER 2 BASIC OPERATION

3. Top Pick-Up Mode Delivery

a. Operation

The machine delivers the original on the

copyboard tray as follows:

If a stamp command (in fax mode) arrives from the copier, the machine puts a stamp marking in the middle of delivery.

1) Feeding the 1st Original

The feeding belt is rotated

counterclockwise to feed the 1st original

about 30 mm (to maintain the sheet-to-

sheet distance from the 2nd original).

1st original

Figure 2-259

2) Delivering the 1st Original/Picking Up the

2nd Original

The clutch (CL) is turned on to eliminate

the difference in speed between the

delivery/reversing roller and the feeding

belt; the 1st original is moved for delivery,

and the 2nd original is picked up.

3) Delivery to the Original Delivery Tray

While the trailing edge of the original is

moved to the original delivery tray, the

delivery motor (M5) switches to low speed

to deliver the original slowly.

2nd original

1st original

Figure 2-260

2-38

Original delivery tray

Figure 2-261

CHAPTER 2 BASIC OPERATION

b. Sequence of Operations (small size, pick-up/delivery; w/ stamp marking)

Pick-up sensor Registration

paper sensor

Delivery sensor 2 Pick-up motor Feeding motor

Belt motor

Clutch

Brake

Stamping solenoid Paper holding

plate solenoid Delivery motor

(S7) (S3)

(M1) (M2) (M3)

(CL)

(BK) (SL4) (SL2)

(M5)

Scanner started/

2nd original picked up

The pick-up motor rotates in the direction opposite of copying mode. The feeding belt rotates clockwise.

CW

CWW

The feeding belt rotates counterclockwise.

1st original moved to

stamping position

Moved for 20 mm

CCW CCW CCW

Low speed

2nd original

moved

Low speed

Scanner started/

3rd original picked up

3rd original

moved to stamping

position

Moved for 20 mm

Figure 2-262

c. Sequence of Operations (small size, pick-up/delivery; w/o stamp marking)

Pick-up sensor Registration

paper sensor Delivery sensor 2 Pick-up motor Feeder motor Belt motor Clutch Brake

Stamping solenoid

Paper retaining solenoid

(SL4) (SL2)

Delivery motor

Scanner started/

2nd original picked up

(S7) (S3)

(M1) (M2) (M3)

(CL)

(BK)

(M5)

2nd original

moved

Low speed

CCW CCW

Low speed Low speed

Scanner started/

3rd original pick-up

3rd original moved/

1st original delivered

Low speed

CCW CCW

The pick-up motor rotates in the position opposite of copying mode.

CW

The feeding belt rotates clockwise.

CWW

The feeding belt rotates counterclockwise.

Figure 2-263

2-39

CHAPTER 2 BASIC OPERATION

H. Stamping Function

1. Outline

The machine is equipped with a stamping function, which operates only in fax mode. The stamping mechanism operates when memory transmission or direct transmission is selected.

A stamp marking is put on originals in response to a command from the copier; the stamping solenoid (SL4) is driven to place a spot (about 3 mm in diameter) on originals.

A marking is on the face of each original as follows:

Mode

Single-sided original mode

Double-sided original mode

Reduced page compositionmode

On each original

On 1st side

On each original

Position

The stamp marking is placed as shown:

Print side

Feeding direction

Center of the original

50 mm

(approx.)

20 mm

(approx.)

Figure 2-264

Table 2-206

2-40

2. Operation

Stamping is initiated by stopping delivery

operation in the middle.

After the start of delivery operation, the original is moved about 20 mm from the point at which the delivery sensor 2 (S6) detects the leading edge. When the original is stopped, the DADF controller PCB generates the stamp solenoid drive signal (SMPSL) to drive the stamp solenoid (SL4), causing the stamp face mounted to the tip of a plunger to hit against the original.

Stamping solenoid (SL4)

CHAPTER 2 BASIC OPERATION

SMPSL

Stamp

Fax original

Delivery sensor 2 (S12)

DADF controller PCB

Figure 2-265

Reference:

A brand new stamp is good for stamping about 7,000 (reference value) originals.

2-41

CHAPTER 2 BASIC OPERATION

3. Sequence of Operations

Belt motor

(M3)

Delivery feeding

Original length

Feeding about 20mm

(approx.equivalent)

Stamping

Delivery

tray delivery

Delivery sensor 2 Stamping solenoid Delivery motor

(S12) (SL4)

Low speed

(M5)

Figure 2-266

2-42

CHAPTER 2 BASIC OPERATION

I . Controlling the Pick-Up Motor

1. Outline

Figure 2-267 is a block diagram of the pick-up motor.

The feeder motor is a DC motor. The microprocessor (Q1) on the DADF controller PCB sends to the drive circuit the pick-up motor drive signal (SMON), pick-up motor rotation direction signal (SDIR), and pick-up motor rotation speed control signal (SMPWM).

In response, the drive circuit drives the pick-up motor according to these three signals.

The control circuit is not equipped with a circuit used to provide the microprocessor (Q1) with feed back, indicating the state of pick-up rotation. As such, the pick-up motor rotation speed control signal (SMPWM) remains constant at all times, and no correction is made when the rotation speed of the pick-up motor fluctuates because of an external force.

DADF controller PCB

Pick-up motor

Q1

CPU

SMON SDIR SMPWM

Drive

circuit

J12-1

M1

J12-2

Figure 2-267

2-43

CHAPTER 2 BASIC OPERATION

2. Relationship Between the Pick-UP Motor Drive Signal (SMON), Pick-Up Motor Rotation Direction Signal (SDIR), and Pick-Up Motor Rotation Speed Control Signal (SMPWM) and the Operation of the Pick-Up Roller

Belt motor drive

signal (SMON)

"1"

"0"

Belt motor

rotation direction

signal(SDIR)

"1"

"0"

"1" / "0"

Belt motor rotation

speed control signal

(SMPWM)

Pulses

"0"

Pulses

"0"

"1" / "0"

Table 2-207

Pick-up roller operation

The pick-up roller rotates in copier mode pick-up direction (counterclockwise).

The pick-upper roll rotates by inertia in copier mode pick-up direction.

The pick-up roll rotates in fax mode pick-up direction (clockwise).

The pick-upper roller rotates by inertia in fax mode pick-up direction (clockwise).c

The pick-up roller stops.

2-44

CHAPTER 2 BASIC OPERATION

J. Controlling the Belt Motor

1. Outline

Figure 2-268 is an outline diagram of the belt motor control circuit. The belt motor is a DC motor.

The microprocessor (Q1) on the DADF controller PCB sends the belt motor drive signal (BMON), belt motor rotation direction signal (BDIR), and belt motor rotation speed control signal (BMPWM) to the drive circuit.

When the belt motor starts to rotate, the belt motor clock sensor (S10) sends the belt motor clock signal (BCLK1) to the microprocessor (Q1). In response, the microprocessor (Q1) compares the belt motor clock signal (BCLK1) against the rotation speed stored in memory to vary the belt motor rotation speed control signal (PMPWM) to make a match, causing the belt motor (M3) to rotate at a specific speed at all times.

DADF controller PCB

Q1

CPU

BMON BDIR BMPWM

BCLK1

Drive

circuit

Figure 2-268

J7-1

J7-2

Belt motor

clock sensor

J9-B4

Belt motor

M3

S10

2-45

CHAPTER 2 BASIC OPERATION

2. Relationship Between the Belt Motor Drive Signal (BMON), Belt Motor Rotation Direction Signal (BDIR), and Belt Motor Rotation Speed Control Signal (BMPWM) and the Feeding Belt

Belt motor drive

signal (BMON)

"1"

"0"

Belt motor

rotation direction

signal(BDIR)

"1"

"0"

"1" / "0"

Belt motor rotation

speed control signal

(BMPWM)

Pulses

"0"

Pulses

"0"

"1" / "0"

Feeding Belt

The feeding belt rotates in pick-up direction (counterclockwise).

The feeding belt rotates by inertial in pick-up direction (counterclockwise).

The feeding belt rotates in copier mode delivery direction (clockwise).

The feeding belt rotates by inertial in copier mode delivery direction(clockwise).

The feeding belt stops.

Table 2-208

3. Protecting the Belt Motor from Overcurrent

At times, overcurrent can occur because of a specific type of original or state of the machine. To

protect the power supply circuit from extra loads occurring because of continuing overcurrent while the belt is rotating in pick-up direction, an overcurrent control circuit is provided.

2-46

K. Detecting Original Jams

Jam type

Original retraction

Pick-up delay

Registration delay

Sensor type

S1,S7

01H

02H

03H

S3,S7

S7

Description Code

Pick-

up

The sensor S7 does not detect the leading edge of an original 1500 msec after the pick-up motor (M1) has turned on and, in addition, the sensor S1 does not detect an original.

The sensor S7 does not detect the leading edge of an original 1500 msec after the pick-up motor (M1) has turned on.

The sensor S3 does not detect the leading edge of an original 350 msec after the sensor S7 has detected the leading edge of an original.

S6

S7

S3

S8

S1

S4

CHAPTER 2 BASIC OPERATION

S14

M4

MS1 MS2

S12

S1 Original tray paper

sensor S3 Registration paper sensor S4 Upper cover sensor

S6 Delivery sensor 1 S7 Pick-up sensor S8 Reversal sensor S12 Delivery sensor 2

S14 Re-circulation sensor MS1 DADF switch MS2 Upper cover switch

Figure 2-269

The timing at which the machine checks for jams is stored in memory in the microprocessor on

the DADF controller PCB, and a jam is detected in terms of the presence/absence of paper at a specific sensor at the time.

When a jam is detected, the machine communicates the fact to the copier in the form of a code.

(Some copiers show such codes in service mode.)

Table 2-209a

2-47

CHAPTER 2 BASIC OPERATION

Jam type Sensor type

Double feeding

Pickup

Original leading edge retreat

Reversal delay 1

Reversal stationary

Reversal delay 2

Reversal

Reversal initial paper

Reversal pick-up delay

Reversal pick-up stationary

S3

S8

S3

Description Code

The sensor S3 remains on even when the 1st original is placed on the copyboard.

At the start of original pick-up, the sensor S3 does not detect the leading edge of an original.

At time of original reversal or delivery, the sensor S8 does not detect the leading edge of an original 140 mm or 225 msec after the belt motor (M3) has started to rotate clockwise.

At time of original reversal or delivery, the sensor S8 does not detect the trailing edge of an original after a reversal delay check.

At time of original delivery pick-up, the sensor S8 does not detect the preceding original 50 mm after the belt motor has started to rotate counterclockwise. (The original to be delivered is moved back to the copyboard glass together with the original picked up).

At time of original reversal, the sensor S8 is on.

At time of original reversal, the sensor S3 does not detect the leading edge of the original that has been reversed 100 mm or 300 msec after the sensor S8 has detected an original.

The sensor S3 does not detect the trailing edge of an original 'original size + 180 mm' after the sensor S8 has turned on.

06H

08H

11H

12H

13H

20H

21H

23H

Delivery delay

Delivery stationary

DADF open Upper cover open

Deli-

Jam original

very

Re-circulating lever idle rotation (2nd circulation or later)

Residual original

Double feeding

S6

MS1 MS2

S4 S1

S6,S3 S8,S7

S8

S14

At time of original delivery, the sensor S6 does not detect an original 100 mm or 250 msec after the sensor S8 has detected the leading edge of an original.

The sensor S6 does not detect the trailing edge of an original 100 mm or 250 msec after a reversal stationary check.

The DADF is opened while in operation.

The upper cover is opened while the DADF is in operation.

The sensor S1 does not detect the original delivered on the original tray.

At the start of original pick-up, the sensor S6, S3, or S8 (also S7 if the paper stopper plate is up) is on.

When picking up the 1st original, an original is detected on the copyboard glass.

For the 2nd circulation or later, the re-circulating lever rotates idly without coming into contact with an original.

Table 2-209b

41H

42H

81H 82H

83H

84H

88H

89H

2-48

CHAPTER 2 BASIC OPERATION

Jam type Sensor type

Delivery failure

DADF open

Deliver y

Upper cover open

Re-circulating lever idle rotation

S3,S6

MS1

MS2,S4

S13

At time of delivery in bottom separation pick-up mode, the original fails to stop (e.g., the original that has been picked up is longer than the original being delivered).

While the copier is at reset because of, for example, the absence of paper, the DADF is opened.

While the copier is at reset because of, for example, the absence of paper, the upper cover is opened.

At time of original pick-up, the re-circulating lever fell off a stack of original.

Description Code

Table 2-209c

Caution

1. Result of Detection The DADF will stop operation immediately upon detection of a jam shown in Table 2-209.

2. Resetting For a pick-up delay jam, the machine may be reset by removing the original from the

original tray. For other types of jams, remove the originals from the original tray, remove the jam from the DADF, and open the DADF.

84H

91H

92H

93H

Reference:

As a rule, detection of a condition for the first original is treated as “improperly placed original”; jams are identified starting with the detection of a condition for the second and subsequent originals.

2-49

CHAPTER 2 BASIC OPERATION

L. Improper Placement of Originals

Re-circulating lever

S14

M4

S3

S4

S1

S7

Paper stopper plate

S1 Original tray paper sensor S3 Registration paper sensor S7 Pick-up sensor S14Re-circulation sensor

Figure 2-270

An improperly placed original can cause a jam or damage to the original. The machine makes a check to ensure that all originals are placed properly to prevent jams or damage. The timing of a check is stored in the microprocessor on the DADF controller, and detection is made in terms of the presence/absence of paper over a specific sensor.

When the machine detects an improperly placed original, it communicates the fact to its host copier. (Some copiers show such codes in service mode.)

2-50

CHAPTER 2 BASIC OPERATION

Fault Sensor Description DADF operation Code

Re-circulating lever idle rotation

Pick-up failure

Paper stopper plate overriding

Count mismatch

Original count

S11

S7

S3

Immediately after the re-circulation motor M4 starts to operate, the re-circulating lever rotates idly without coming into contact with an original.

The sensor S7 does not detect the leading edge of an original 1500 msec after the start of pick-up.

At time of placement of originals, the originals ride over the paper stopper plate.

The number of originals placed on the original tray after jam removal is as follows; see Note:

Original copied

Original placed on tray

The re-circulating lever does not fall under the original tray, not enabling detection of the last original.

Reference

Normally, the original tray can hold as many as 50 sheets of A5, STMT, A4, B5, or LTR or 25 sheets of A3, B4, 279x432mm (11"x17"), or LGL.

Stops operation immediately upon detection.

The separation belt, feeding roller, and pick-up roller stop operation immediately. The original moving in advance is delivered after the end of copying; then, the DADF stops operation.

Stops operation mmediately upon detection.

Stops operation immediately upon detection.

Stops operation after counting 100 sheets.

01H

03H

05H

11H

12H

Original extraction

Wrong original size

Wrong original size or size mix in reduced page composition mode

S14

S3

The re-circulating lever fell under the original tray while an original is being processed.

The size of the original that is picked up is of a non-default size.

1. The original that is picked up is of a type not supported by reduced page composition mode.

2. The original that is picked up is of a size different from the size of the first original.

Table 2-210

Stops operation immediately upon detection. Stops operation immediately upon detection.

Stops detection immediately upon detection.

13H

14H

15H

2-51

CHAPTER 2 BASIC OPERATION

As many as10 originals are placed on the original tray.

The 8th original jams.

(As many as 7 originals have been copied.)

Error 2

Error 1

Normal

Place 10 originals on the original tray in initial condition

As many as 3 originals are placed on the original tray.

10 (originals) - 7 (copied) = 3 originals

The 7 originals that have been copied are counted, and copying is resumed with the 8th original.

The originals are counted, and then the DADF is stopped.

The 3rd original jams.

(As many as 2 originals have been copied.)

As many as 8 originals are placed on the original tray.

10 (originals) - 2 (copied) = 8 originals

The originals are counted, and then copying is resumed with the 2nd.

When a jam occurs, the host copier remembers how many originals have been copied. The count is sent to the DADF after jam removal, and the DADF circulates the originals that have been copied; it then places originals that have not been copied on the copyboard for copying. This is why normal copying would not be possible if a different number of originals are placed on the original tray after jam removal.

In the above chart, error 1 will be treated as a condition in which a different number of originals are placed after jam removal; in such a case, both the DADF and the copier stop operation to indicate an error. The operation continues, however, for error 2.

1. Resetting

To reset, remove all originals from the original tray, and then place the originals once again. Some copiers indicate an appropriate message. Be sure to follow such a message when placing the originals.

In reduced page composition mode, on the other hand, remove the originals from the original tray, and open the DADF once.

2-52

CHAPTER 2 BASIC OPERATION

III. POWER SUPPLY

A. Outline

Figure 2-301 is an outline diagram of the machine’s power supply system. The machine’s power supply is provide by its host copier with 24 V (24 VP, 24 VL).

24 VP is mainly used for loads, and is cut off when the machine is opened or its upper cover is opened. The circuit breaker (CB1) operates to cut off the power to protect the circuit in response to overcurrent.

24 VL is converted by the regulator into 5 V, and is used by the logic system and sensors.

The fuse resistance (R26) melts in response to overcurrent in the circuit, thereby cutting off the power and protecting the circuit.

Copier

24VP

24VL

RF switch

J2-1

Circuit breaker

Fuse resistance

(R26)

J1-6

(MS1)

(CB1)

J2-3 COM

J2-4 NO

J3-1 COM

Regulator

IC (Q14)

5V

DADF controller PCB

Figure 2-301

Upper cover switch

(MS2)

J3-2 NO

Logic

Solenoid

(SL1 through SL4)

Clutch (CL)

Brake (BK)

Motor (M1, M2, M3, M4)

Sensor (S1 through S14)

Original width detecting

volume (VR)

Indicator LED

(LED101, LED102)

Re-circulation motor (M4)

2-53

CHAPTER 3

MECHANICAL SYSTEM

I. BASIC CONSTRUCITON ............ 3-1

A. External Covers..........................3-1

B. Switches.....................................3-3

C. Adjusting the DADF Height ........3-5

II. DRIVE SYSTEM .......................... 3-6

A. Removing the Pick-Up

Motor Unit ...................................3-6

B. Removing the Feeder

Motor Unit ...................................3-6

C. Belt Motor ...................................3-7

D. Removing the Clutch Unit ..........3-9

E. Delivery Motor ..........................3-10

III. FEEDING SYSTEM ................... 3-11

A. Pick-Up Roller .......................... 3-11

B. Removing the Separation

Belt Unit.................................... 3-12

C. Feeding Roller Unit.................. 3-12

D. Registration Roller ................... 3-14

E. Delivery/Resersing Roller ........ 3-16

F. Delivery Roller Unit

(bottom pick-up mode).............3-20

G. Delviery Roller Unit

(top pick-up mode)....................3-20

H. Reversing Guide ...................... 3-22

I. Stopper Plate Solenoid ............ 3-24

J. Positioning the Paper Retaining

Plate Solenoid (SL2) ................ 3-24

K. Positioning the Paper Deflecting

Solenoid (SL3) ......................... 3-26

L. Stamp Solenoid........................ 3-26

M. Feeding Belt ............................. 3-28

IV. CLEANING ................................ 3-30

A. Belt Assembly ..........................3-30

B. Sensors .................................... 3-30

C. Separation Flapper .................. 3-33

D. Separation Guide ..................... 3-33

V. FEEDING...................................3-34

A. Pick-Up Drive Assembly .......... 3-34

B. Right Delivery Drive

Assembly..................................3-34

CHAPTER 3 MECHANICAL SYSTEM

I.

BASIC CONSTRUCTION

A.External Covers

[2]

[1]

[1]Upper cover [2]Original tray [3]Body cover [4]Front cover

Figure 3-101

Remove the covers as shown when cleaning, inspecting, and repairing the inside of the machine.

[3]

[4]

4)Go to the rear of the copier, and lift the DADF upright to remove.

1. Removing the DADF

1)Turn on off the copier.

2)Disconnect the communication cable of the DADF from the copier.

3)Open the DADF fully.

Figure 3-103

Reference:

The feet of the hinges of the machine are equipped with a locking mechanism designed to prevent slippage. When detaching the machine from the copier, you must fully open it to disengage its locks.

Figure 3-102

3-1

CHAPTER 3 MECHANICAL SYSTEM

2. Removing the Body Cover

1) Remove the seven mounting screws, and detach the body cover.

[1]

Figure 3-104

[1]

[1] [1]

2) Remove the two mounting screws [2], and detach the original tray.

Caution:

The original tray is connected by means of a cable. Take extra care not to damage the cable during work.

[2]

[3]

[1]

Figure 3-105

Figure 3-106

[2]

Figure 3-107

3) While avoiding the original tray, detach the body cover and the front cover.

[1]

3-2

CHAPTER 3 MECHANICAL SYSTEM

Copier

DADF

10~100mm

3. Side Guide Lock

The side guide of the machine is equipped with a side guide lock so that it will not open farther than 297 mm (A/A3).

If an original longer in width than 297 mm is used, the side guide lock must be removed (00 mm max.).

1) Loosen the screw [1], and remove the side

guide lock [2].

Stopper

Plate

Screw

B. Switches

The machine is equipped with two microswitches (DADF switch MS1 and upper cover open/closed switch MS2) so that the machine will not operate when it or its upper cover is open.

1. Adjusting the DADF Switch (MS1)

1) Remove the body cover.

2) Open and close the DADF, and adjust the

retaining plate [2] so that the DADF switch

(MS1) [1] turns on and off while the

distance from the copyboard glass to the

DADF end is between 10 and 100 mm.

[1]

Figure 3-108

Caution:

When making copies, be sure to adjust the side guide to the size of the original. If the side guide is improperly positioned, the original will tend to move askew.

[2]

Figure 3-109

Figure 3-110

3-3

CHAPTER 3 MECHANICAL SYSTEM

2. Upper Cover Switch (MS2)

1) Check to make sure that both upper cover switches (front, rear) are on when the upper cover is closed.

3. Mounting the Original Width

Detecting Volume

1) Loosen the two screws [2], and detach the side guide [1].

[1]

[2]

3) Mount the gear [5].

[5]

Figure 3-113

4) Turn the original width detecting volume [6] fully in the direction of the arrow; then, turn it in the opposite direction (equivalent of half a tooth) so that it is as indicated in the figure.

Figure 3-111

2) Open the side guide at the rear [3] and the front [4] fully.

[4]

[3]

Figure 3-112

Half a tooth

[6]

Figure 3-114

3-4

CHAPTER 3 MECHANICAL SYSTEM

5) Keeping the original width detecting volume [6] as in step 4), mount it to the original tray [7], and fix it in position with screws [8]; then, connect the connector [9].

[8]

[7]

[9]

[6]

Figure 3-115

6) Mount the side guide lock removed in step 1, and execute adjustments of the original width detecting volume. (For adjustments, see p. 5-18.)

C. Adjusting the DADF Height

1) Remove the copier’s rear side plate. Loosen the locking nut [1], and turn the height adjusting screw [2] so that the left/ right rear foot is 0.2 ±0.1 mm from the horizontal size plate of the copyboard glass.

[1] [2]

Figure 3-116

2) After making adjustments, check to make sure that the left and right front rubber feet are in contact with the copyboard glass.

3-5

CHAPTER 3 MECHANICAL SYSTEM

II . DRIVE SYSTEM

A. Removing the Pick-Up

Motor Unit

1) Remove the body cover.

2) Remove the tie-wrap as necessary.

3) Disconnect the connector J12 [2] from the DADF controller PBC [1].

5) Disconnect the connector [5] of the upper cover sensor S4.

6) Remove the two mounting screws [6], and detach the pick-up motor unit [7].

[6]

[5]

[6]

[7]

[1] [2]

Figure 3-201

4) Remove the screw [3], and remove the cable guide [4].

Figure 3-203

B. Removing the Feeder Motor

Unit

1) Remove the pick-up motor unit.

2) Remove the tie-wrap as necessary.

3) Disconnect the connector J11 [2] from the DADF controller PCB [1].

3-6

[4]

[3]

[1]

[2]

Figure 3-202

Figure 3-204

CHAPTER 3 MECHANICAL SYSTEM

4) Remove the two screws [4], and disconnect the connector [3] of the feeder motor clock sensor S9.

[3]

[4]

Figure 3-205

5) Detach the two drive belts [5], and detach the feeder motor unit [6].

C. Belt Motor

1. Removing the Belt Motor

1) Remove the DADF from the copier.

2) Remove the feeder motor unit.

3) Remove the tie-wrap as necessary.

4) Disconnect the connectors J6 [1], J7 [3], and J13 [3] of the DADF controller PCB.

[3] [1] [2]

[5]

[6]

Figure 3-206

Figure 3-207

5) Disconnect the connector [4] of the belt motor clock sensor (S10).

[4]

Figure 3-208

3-7

CHAPTER 3 MECHANICAL SYSTEM

6) Mark the position of the belt motor count [5] on the DADF with a scriber, and remove the three screws [6].

[6]

[5]

Figure 3-209

7) Detach the feeding belt drive roller side [8] of the timing belt [7], and detach the belt motor unit [5].

2. Making Adjustments

1) Secure the belt motor unit [2] in place with three screws so that the displacement is 3 ±1 mm when the timing belt is pushed under a force of 3 ±1 mm.

3 1mm

+

50mm (approx.)

[2]

+

200 20g

[1]

[3]

[7]

[5]

Figure 3-210

[8]

The spring gauge must be capable of measuring 600 g or so

(CK-0058).

Figure 3-211

2) Pull the belt tensioner [4] with a force of 500 ± 50 g, and secure it in place with the screw [5].

+

500 20g

3-8

[4] [5]

The spring must be capable of measuring 600 g or so

(CK-0058).

Figure 3-212

CHAPTER 3 MECHANICAL SYSTEM

D. Removing the Clutch Unit

1) Remove the belt unit [1].

2) Detach the drive belt [2].

[1]

[2]

Figure 3-213

3) Remove the E-ring [3].

4) Displace the bush [4], and remove the clutch unit [5].

Caution:

When mounting the clutch unit, be sure that the slip stop [6] of the clutch engages with the stopper [7] of the mount.

[6]

[7]

figure 3-215

[4]

[3]

[5]

Figure 3-214

3-9

CHAPTER 3 MECHANICAL SYSTEM

E. Delivery Motor

1) Remove the body cover.

2) Disconnect the three connectors [1].

[1]

4) Disconnect the connector [6], and remove the two screws [7]; then, detach the delivery motor [8].

[6]

[8]

[7]

Figure 3-218

Figure 3-216

3) Remove the two screws [2], and free the cable [4] from the cable retainer [3]; then, detach the delivery monitor unit [5].

[5]

[3]

[2] [4] [2]

3-10

Figure 3-217

CHAPTER 3 MECHANICAL SYSTEM

III. FEEDING SYSTEM

A. Pick-Up Roller

1) Remove the body cover.

2) Remove the two screws [1], and detach the original tray mount [2].

[1] [2] [1]

4) Remove the two screws [5], and detach the original inlet guide plate [6].

[6]

[5]

Figure 3-303

Figure 3-301

3) Remove the screw [3], and detach the paper retaining solenoid [4].

[4]

[3]

5) Rotate the pick-up roller [7] so that it is as shown in the figure; then, remove the screw [8], and detach the pick-up roller.

[8]

[7]

Figure 3-304

Figure 3-302

3-11

CHAPTER 3 MECHANICAL SYSTEM

B. Removing the Separation

Belt Unit

1) Remove the body cover.

2) Detach the reversing roller drive belt [1].

[1]

C. Feeding Roller Unit

1) Remove the body cover.

2) Remove the original tray mount.

3) Remove the original inlet guide plate.

4) Remove the separation belt unit.

5) Remove the four screws [5], and detach the separation guide plate [6].

[5] [6] [5]

Figure 3-305

3) Remove the two screws [2], and detach the separation belt unit [3] together with the fixing plate [4].

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

Figure 3-307

6) Remove the two screws [8], and detach the inside guide plate [7].

[8] [7]

[8]

Figure 3-308

3-12

Figure 3-306

CHAPTER 3 MECHANICAL SYSTEM

7) Remove the screw [9], and detach the stopper [10].

[9] [10]

Figure 3-309

8) Remove the E-ring [11], and detach the idler gear [12].

9) Remove the E-ring [13], and detach the gear [14] and the timing belt [15]. (Take care not to drop the pin.)

10) Remove the E-ring [16], and shift the arm [17] and the gear [18] in the direction of the arrow.

[16] [17] [18]

Figure 3-311

11) Remove the E-ring [19], and shift the bush [20] in the direction of the arrow; then, remove the feeding roller unit [21].

[12]

[11] [15]

[14] [13]

Figure 3-310

[21] [19] [20]

Figure 3-312

3-13

CHAPTER 3 MECHANICAL SYSTEM

D. Registration Roller

1) Remove the DADF from the copier.

2) Remove the body cover.

3) Remove the feeding roller unit.

4) Remove the pick-up motor unit.

5) Remove the four screws [2], and detach the right hinge unit [1].

[2]

7) Remove the screw [5], and detach the solenoid mount [6].

[6]

[5]

Figure 3-315

8) Remove the spring [7] and the screw [8]; then, detach the arm [9].

[2]

[1]

[2]

Figure 3-313

6) Remove the E-ring [3], and detach the bush [4].

[4] [3]

[7] [9] [8]

Figure 3-316

3-14

Figure 3-314

CHAPTER 3 MECHANICAL SYSTEM

9) Remove the E-ring [10] and the bush [11]; then, detach the link arm shaft [12].

[10] [11] [12]

11) Remove the E-ring [15], tension spring [16], bush [17], and two screws [18].

[18]

[17]

[15]

[16]

Figure 3-319

Figure 3-317

10) Remove the two screws [13], and remove the sensor mount [14].

[14]

[13]

12) Remove the grip ring [19], clock plate [20], sensor mount [21], and spring [22].

[21]

[22]

[20]

[19]

Figure 3-320

Figure 3-318

3-15

CHAPTER 3 MECHANICAL SYSTEM

13) Remove the grip ring [23], tension spring [24], bush [25], and two screws [26]; then, detach the registration roller [27].

[25]

[26] [24] [23]

[26]

[27]

E. Delivery/Reversing Roller

1) Remove the DADF from the copier.

2) Remove the body cover.

3) Remove the registration roller.

4) Remove the two E-rings [1], gear [2], timing belt [3], and bush [4]. (Take care not to drop the pin.)

Figure 3-321

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

Figure 3-322

3-16

CHAPTER 3 MECHANICAL SYSTEM

5) Remove the gear [10]. (Take care not to drop the pin.)

[5]

Figure 3-323

6) Remove the grip ring [6], and remove the bush [7].

[7]

[6]

Figure 3-324

Reference:

Remove the gear while unlocking it.

Figure 3-323-a

7) Remove the spring [8] and the screw [9]; then, detach the lower guide stopper [10].

[10] [9] [8]

Figure 3-325

3-17

CHAPTER 3 MECHANICAL SYSTEM

[14]

[15]

8) Remove the spring [11].

[11]

Figure 3-326

9) Remove the screw [13], and detach the sensor cover; then, disconnect the sensor connector [14], and remove the registration sensor [15] by lifting it.

[13]

[12]

Figure 3-328

10) Remove the paper guide [16].

[16]

Figure 3-329

3-18

Figure 3-327

CHAPTER 3 MECHANICAL SYSTEM

11) Remove the two screws [17] at the front and the two screws [18] at the rear; then, detach the reversing plate [19] to the bottom.

[17]

12) Remove the four screws [20], and remove the front plate [21].

[21]

[20]

Figure 3-332

13) Remove the delivery/reversing roller [22].

Figure 3-330 (front)

[19]

[18]

Figure 3-331 (rear)

[22]

Figure 3-333

3-19

CHAPTER 3 MECHANICAL SYSTEM

F. Delivery Roller Unit (bottom

pick-up mode)

1) Remove the body cover.

2) Remove the pick-up motor .

3) Remove the screw [1].

[1] [2] [1]

Figure 3-334

4) Remove the E-ring [2].

5) Remove the screw [3], and remove the fixing pin [4]; then, detach the delivery roller unit [5].

[6]

[5]

Figure 3-336

[2]

Figure 3-335

G . Delivery Roller Unit (top

pick-up mode)

1) Remove the body cover.

2) Remove the screw [1] and the spring [2]; then, disconnect the connector [3].

[8]

[7]

3-20

Figure 3-337

CHAPTER 3 MECHANICAL SYSTEM

3) Remove the two screws [4], and detach the timing belt [5] and the motor unit [6].

[5]

[4]

[6] [4]

Figure 3-338

4) Remove the screw at the front and the two screws [8] at the rear; then, detach the delivery roller unit [9].

[8]

[7]

figure 3-339

(back)

[9]

3-21

CHAPTER 3 MECHANICAL SYSTEM

H. Reversing Guide

1) Remove the body cover.

2) Remove the gear [1] and the timing belt [2].

[1]

[2]

Figure 3l-340

Reference:

Remove the gear while unlocking it.

3) Disengage the front side [3] and the rear side [4] of the reversing guide spring.

[3]

Figure 3-342

3-22

[4]

Figure 3-341

Figure 3-343

CHAPTER 3 MECHANICAL SYSTEM

4) Remove the screw [5], and detach the solenoid unit [6].

[6]

[5]

Figure 3-344

5) Remove the reversing sensor jack [7], and the grounding cord [8].

6) Remove the screw [9], screw [11], and fixing pin [12]; then, detach the reversing guide [13].

Caution:

When mounting the fixing pin, be sure that its position is as it was initially.

[7]

[13] [12] [11] [10] [9]

Figure 3-346

[8]

Figure 3-345

3-23

CHAPTER 3 MECHANICAL SYSTEM

I . Stopper Plate Solenoid

1. Removing the Stopper Plate Solenoid

1) Remove the body cover.

2) Remove the two screws [1], and remove

the original tray mounting plate [2].

[1] [2] [1]

2. Making Adjustments

1) Secure the solenoid [1] in place where the stopper [3] (rubber block) butts against the rear edge of the stopper plate [2] when the plunger of the solenoid [1] is at the end of its stroke.

[1][2][3]

Figure 3-349

Figure 3-347

3) Remove the two screws, and disconnect the connector [4]; then, remove the stopper plate solenoid [5].

[3]

J. Positioning the Paper

Retaining Plate Solenoid (SL2)

1) Prepare test strips. Cut a sheet of A4 or LTR paper (64 g/m into widths of about 70 mm each.

1/3

1/3 1/3

Vertical

Figure 3-350

70 mm (approx.)

2

)

3-24

[5]

[4]

Figure 3-348

CHAPTER 3 MECHANICAL SYSTEM

2) Remove the front cover and the cover.

3) Shift bits [5] and [6] of the DIP switch (DSW1) on the DADF controller to ON, and press the push switch.

• The pick-up roller starts to rotate and will stop at the top pick-up mode pick-up position.

4) When the pick-up roller has stopped, press the push switch (SW3) on the DADF controller once again.

• The motor will stop operation.

5) Secure the paper retaining solenoid in place so that the delivery roller [2] (pick-up roll for top pick-up mode) is in firm contact with the pick-up roll [3] when the plunger [1] of the paper retaining solenoid is fully pushed.

[2]

6) Push in s test strip prepared in step [1] between the delivery roller and the pick-up roller while pushing the plunger of the paper retaining solenoid fully. Check to make sure that the delivery roller rotates when the rear and the front pick-up roller is tested this way.

Test sheet

[1]

Figure 3-351

[3]

Figure 3-352

Reference:

When pulling the test strip, the one-way clutch will operate to hold the delivery roller from rotating.

7) If the delivery roll does not rotate when a test strip is pushed in, go back to step 3).

8) Shift the bits of the DIP switch (DSW1) on the DADF controller PCB back to initial configuration.

3-25

CHAPTER 3 MECHANICAL SYSTEM

K. Positioning the Paper

Deflecting Solenoid (SL3)

1) Remove the body cover.

2) Loosen the fixing screw [1], and tighten it when the stroke of the solenoid [2] is 4.5 mm.

[1]

4.5mm

[2]

3) Remove the E-ring [4] and the bush [5].

[5]

[4]

Figure 3-355

4) Remove the two E-rings [6], gear [7], and bush [8]; the, detach the delivery roller [9]. (Take care not to drop the pin.)

Figure 3-353

L. Stamp Solenoid

1) Remove the delivery roller unit (top pickup mode).

2) Remove the screw [1] and spring [2]; then, detach the flapper plate [3].

[2]

[9]

[8]

[6]

[7]

[6]

Figure 3-356

3-26

[3]

[1]

Figure 3-354

Canon GP405, Gp-335 Service Manual DADF-A1

Specifications and Main Features

Frequently Asked Questions

User Manual

INTRODUCTION

CONTENTS

CHAPTER 1

I. FEATURES

II. SPECIFICATIONS

III. NAMES OF PARTS

IV. OPERATION

CHAPTER 2

I. BASIC CONSTRUCTION

II . BASIC OPERATION

III. POWER SUPPLY

CHAPTER 3

II . DRIVE SYSTEM

III. FEEDING SYSTEM