Canon GP405, Gp-335 Service Manual DADF-B1

DADF-B1

REVISION 0

APR. 1999

FY8-13G6-000

IMPORTANT

THIS DOCUMENT 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 DEPAR TMENT OF THE SALES COMPANY. THIS DOCUMENT IS INTENDED FOR ALL SALES AREAS, AND MA Y CONTAIN INFORMATION NOT APPLICABLE T O CERTAIN 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 DIVISION

CANON INC.

5-1, Hakusan 7-chome, Toride, Ibaraki, 302-8501 Japan

INTRODUCTION

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

Manual consists of the following chapters:

Chapter 1 “General Description” introduces the ADF’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

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

A. External View .........................1-4

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

IV. OPERATIONS .............................1-5

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

B. Making Copies ....................... 1-5

C. Warnings and Actions ............1-5

D. Routine Maintenance by the

User........................................1-6

CHAPTER 1 GENERAL DESCRIPITON

I. FEATURES

1. Small in size, and light in weight.

It is a document feeder designed as a single-frame unit for small size and light weight.

2. Handles double-sided originals.

It is equipped with a reversing delivery unit, capable of turning over originals and returning them

to the copyboard glass.

3. Wingless design.

Its delivery tray is of an integrated construction.

4. Automatic identification of original size.

It is capable of identifying the size of an original in terms of lengthwise (feeding) and

breadthwise directions for communication to its host copier.

4. Handles mixed sizes.

It can accommodate originals of different sizes (of the same width, i.e., configuration).

5. Accommodates thick originals.

It is equipped with a book equalizing hinge, enabling the use of a thick original (50 mm thick;

e.g., book).

6. Reversal delivery flapper.

It rotates the reversal delivery motor clockwise and counterclockwise to open and close the

flapper, switching the feeding path.

1-1

CHAPTER 1 GENERAL DESCRIPITON

II. SPECIFICATIONS

Item Specifications

Pickup method Automatic pickup/delivery Type of original Original tray: double-sided sheet (52 to 105 g/m

Copyboard glass: book (50 mm thick max.)

Size of original A3 (279 mm x 431.8 mm; 11"x17") to A5 (STMT)

Length: 140 to 432 mm (feeding direction) Width: 140 to 297 (305) mm Note: The values in parentheses indicate when the guide lock is released.

Orientation of original Face up

1st page at top

Placement of original Center reference Original separation Separation pad (top separation)

2

); see Note 1.

Original processing mode

Height of stack (80 g/m

Mixing sizes Possible (of the same width) Size identification Yes (feeding direction + default width) Residual original

detection 2-on-1 function No (by copier's memory) Stamp No Last original detection 690 msec or less Communication with

copier Power supply 24 VDC (from copier) Serial numbers ZSB xxxxx AB

Maximum power supply

2

paper)

Single-sided original processing (small-size, large-size), double-sided original processing

30 sheets (small size; A4, B5, A5, STMT, LTR) 15 sheets (large-size; A3, 279x431.8 mm/11"x17", B4, LGL)

Yes (by LED)

IPC 2

ZSC xxxxx INCH/A ZSD xxxxx A ZSE xxxxx AB/INCH

160 W or less at peak; 39 W in average

Weight 12.8 kg (approx.) Dimensions 583 (W) x 506 (D) x 179 (H) mm Operating environment

temperature/humidity range

Same as copier

Table 1-201

1-2

CHAPTER 1 GENERAL DESCRIPITON

Time to replace originals

Point of exposure (leading edge of image)

Note 1:

The following may not be used as an

original:

• Sheet with holes (as for filing).

• Sheet with a staple, clip, or adhesive.

• Sheet with a cut-and-paste patch.

• Sheet with a carbon back.

• Sheet with large curling, bending, or wrinkling. If an original has large curling, straighten

it out as much as possible, and place it so that the curling edge is the trailing edge.

Note:

The specifications are subject to change for product improvement.

Note 2:

Time Taken to Replace Originals

The value indicates the time passing from when an original is moved to when its trailing edge reaches the point of exposure. However, it does not include separation of the original.

Figure 1-201

1-3

CHAPTER 1 GENERAL DESCRIPITON

III. NAMES OF PARTS

A. External view

[2]

[1][3]

[6]

[4]

[8]

B. Cross Section

[5]

[7]

Figure 1-301

[1] Original tray [2] Auxiliary tray [3] Slide guides [4] Original Set indicator [5] Last original sensor [6] Pickup unit cover [7] Reversal delivery unit cover [8] Original delivery tray

[4]

[5]

Pickup Assembly [1] Pickup roller [2] Lifter [3] Separation pad [4] Separation roller [5] Registration roller

[3]

[2]

[7] [8] [9]

Pickup assembly

[1]

[12]

[6]

Feeding assembly

Figure 1-302

Feeding Assembly [6] Feeding belt [7] Feeding belt drive roller [8] Retaining roll [9] Feeding belt linkage roller

Reversal Delivery Assembly [10] Reversal delivery flapper [11] Reversal delivery

registration roller

[12] Reversing roller

Reversal delivery assembly

[11] [10]

1-4

CHAPTER 1 GENERAL DESCRIPITON

IV. OPERATIONS

A. Original Set Indicator

The Original Set indicator turns on when an original is on the original tray, and it starts to flash

when a jam occurs.

Figure 1-401

B. Making Copies

1) Adjust the slide guides to suit the size of the originals.

2) Place the stack of originals against the end plate of the original tray with the first page on top.

3) Set the copier to the appropriate copying mode.

4) Press the copier’s Copy Start key.

C. Warnings and Actions

You can suspect an original jam if the Original Set indicator has started to flash. Make the

following checks, and take the appropriate actions:

1) Open the pickup unit cover and the reversal delivery unit; then, remove any original jam.

2) Remove the originals from the original tray.

3) Open the ADF, and remove any original jam.

4) Remove any original from the copyboard glass.

5) Close the ADF.

6) Put the originals back into order, and place the stack on the original tray once again.

7) Press the copier’s Copy Start key.

1-5

CHAPTER 1 GENERAL DESCRIPITON

D. Routine Inspection by the

User

Instruct the user to clean the following on a regular basis:

1. Copyboard Glass

Clean it using a cloth moistened with water or alcohol; then, dry wipe it.

2. Feeding Belt

Clean it using water or alcohol.

3. Others

If any part of the external panels of the ADF is soiled, clean it with a solution of mild detergent;

then, dry wip it.

1-6

CHAPTER 2

BASIC OPERATION

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

A. Outline of Electrical Circuitry ....2-1

B. Inputs to the ADF Controller

PCB........................................2-2

C. Outputs from the ADF Controller

PCB........................................2-4

II. BASIC OPERATIONS................. 2-5

A. Outline.................................... 2-5

B. Detecting an Original .............2-6

C. Picking Up and Separating

Originals...............................2-11

D. Moving Originals .................. 2-18

E. Turning Over an Original/

Delivery................................2-23

F. Movement of Originals .........2-32

G. Detecting an Original Jam ... 2-43

H. Alarm Detection ...................2-47

I. Power Supply ....................... 2-50

CHAPTER 2 BASIC OPERATION

I. BASIC CONSTRUCTION

A.

Outline of Electrical Circuitry

The major electrical mechanisms of the ADF are controlled by a microprocessor (CPU) on the

ADF controller PCB.

The microprocessor is designed to read signals from sensors and its host copier to generate

signals used to drive loads (motors, brakes).

ADF controller PCB

Sensor

Variable resistor

ROM

(Q2)

IPC

(Q3)

CPU

(Q1)

EEPROM

(Q4)

24V 5V

5 VDC power supply

Power supply circuit

Motor

Brake

Indicator LED PCB

Copier

Figure 2-101

2-1

CHAPTER 2 BASIC OPERATION

B. Inputs to the ADF Controller PCB

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

ADF controller PCB

Feed motor clock sensor

SR1

Pickup unit cover sensor

SR2

Separation sensor

SR3

Original set sensor

U503

+

3

2

1

3

1

2

J102

3

1

2

J103

4

3

2

2 1 5

J301

10

1

11

5

1 2 3

J1101J101

1 3 2

4 6 5

8 9

7

J1102

3 2 1

11

9

10

8 6 7

4 3

2 1 5

J6A-3

J6FA-2 J6FA-1

J6A-4

J6FA-6 J6FA-5

J6A-7

J6FA-9 J6FA-8

J6A-11

J6FA-12 J6FA-13 J6FA-14 J6FA-10

5V

FMCK

+

5V

SCVR

+

5V

SPR

+

5V

+

24V

EMP EPLED

While the feed motor is rotating, alternates between ’1’ and ’0’.

When the pickup unit cover is opened, ’0’. (When the light-blocking plate is not at the sensor.)

When an original is detected, ’0’. (When the light-blocking plate is not at the sensor.)

When an original blocks the sensor, ’0’.

Pre-registration sensor

U502

Original width detecting volume

U508

Last original sensor

U504

4

2

3

5

4

4 1

1

J201

1

3

1

2

3

1

3

J801

4

4 3 2 1 5

J401 J1801

5

3

6

2

7

1

8

5

4

J6B-6

J6FB-5 J6FB-3 J6FB-4 J6FB-7

J6B-8

8

J6FA-9

7

J6FA-10

6

4

J6B-12

3

J6FB-13

2

J6FB-14 J6FB-15

1

J6FB-11

5

Figure 2-102

+

5V

+

24V

ENT ETLED

+

5V

WIDE

+

5V

+

24V

LAST LTLED

When the original blocks the sensor, ’0’.

Generates an analog voltage to suit the width of the original placed on the original tray.

When an original blocks the sensor, ’1’.

2-2

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

Reversal delivery inlet sensor

SR4

Reversal delivery registration sensor/delivery sensor

SR5

Reversal outlet sensor

U505

ADF open/closed sensor

SR6

Reversal delivery motor clock sensor

SR7

Reversal delivery unit cover sensor

SR8

3

3 1 2

J107

3 1 2

J108 J103

2 3 5 4 1

J501 J502

3 1 2

J109

1 2 3

J110

3 1 2

J111

1

3

2

4

3

6

1

5

2

4

3

5

1

4

2 5

1

3 1 2

1 2 3

3 1 2

J1107

6 4 5

3 1 2

2 3 5 4

J6FA-11

1

J7A-1

J6FA-3 J6FA-2

J7A-4

J6FA-6 J6FA-5

J7B-10

J6FA-9 J6FA-7 J6FA-8

J7B-1

J6FA-3 J6FA-2

J7B-6

J6FA-5 J6FA-4

J7B-7

J6FA-9 J6FA-8

+

5V

EENT

+

5V

EREG

+

5V

+

24V

TURN TULED

+

5V

OPEN*

+

5V

EMCK

+

5V

CHAPTER 2 BASIC OPERATION

ADF controller PCB

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

When an original blocks the sensor, ’0’.

When the ADF is opened, ’0’. (When the light-blocking plate is not at the sensor.)

While the reversing delivery motor is rotating, alternates between ’1’ and ’0’.

When the reversal delivery unit cover is opened, ’0’. (When the light-blocking plate is at the sensor.)

The asterisk (*) indicates that the signal turns on when ’0’ (low active).

Figure 2-103

2-3

CHAPTER 2 BASIC OPERATION

C. Outputs from the ADF Controller PCB

1. Outputs from the ADF Controller PCB (1/1)

Separation motor

J5-1

1

M1

Feed motor

M2

M

1

2

1

2

J104

2

1

2

J6FA-2

J6FA-4

J5-3

SPM1

SPM2

FDM1

FDM2

ADF controller PCB

See "Controlling the Separation Motor (M1)" on p. 2-16.

See "Controlling the Feed Motor (M2)" on p. 2-21.

Feed motor brake

BK1

BK

Reversal delivery motor

M3

M

Original Set indicator (LED)

U507

1

2

1

2

2 1

J112

J701

1

J6FAJ5-6

2

1

J6FA-2

2

J6B-1

2

J6FA-2

1

J5-5

J9-1

BK

EJM1

EJM2

OGLED

+

24V

When ’0’, the brake (BK1) turns on.

See "Controlling the Reversal Delivery Motor (M3)" on p. 2-29.

+5

V

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

2-4

Figure 2-104

CHAPTER 2 BASIC OPERATION

II. BASIC OPERATIONS

A. Outline

The ADF is equipped with three motors for separation, feeding, and delivery (reversal) and one brake.

The separation motor (M1) is used to separate and pick up originals. The feed motor (M2) is used to move originals to and stop them at the copyboard glass, while the reversal delivery motor (M3) is deigned to deliver or reverse originals. The brake (BK) serves to stop the operation of the feed motor (M2).

ADF controller PCB

Feed motor clock signal (FMCK)

Feed motor drive signal (FDM1, FDM2)

Pickup detection signal (SPR)

Pickup unit cover open/closed detection signal (SCVR)

Feed motor brake drive signal (Bk*)

M1

SR3

SR2

Original pickup tray paper detection signal (EMP)

Original Set indicator ON signal (OGLED)

Separation motor drive signal (SPM1, SPM2)

U507

U508

U503

BK

M2

Last original detection signal (LAST)

Original size detection signal (WIDE)

Pickup registration signal (ENT)

ADF open/closed detection signal (OPEN)

U504

Copier

SR1

Figure 2-201

Reversal/delivery outlet paper detection signal (TURN)

Reversal delivery unit cover open/

closed detection signal (ECVR)

Reversal/delivery motor clock signal (EMCK)

Reversal delivery motor drive signal (EJM1, EJM2)

M3

SR7

SR8

U505

SR6

Reversal/delivery registration signal/

delivery detection signal (EREG)

Reversal/delivery inlet paper detection signal (EENT)

SR5

SR4

2-5

CHAPTER 2 BASIC OPERATION

B. Detecting an Original

1. Outline

The ADF is equipped with the following

three types of original detecting mechanisms:

a. Detecting the Presence/Absence of

an Original

It detects the presence/absence of an

original on the original tray.

b. Identifying the Size of an Original

It identifies the length (feeding direction)

and width of an original.

c. Detecting the Last Original

It detects the trailing edge of the last

original.

a. Detecting the Presence/Absence of

an Original

The presence/absence of an original on the original tray is detected by the original set sensor. When an original is placed on the original tray, the light from the light-emitting side of the original set sensor is blocked, and the light-receiving side of the original set sensor starts to send the original detection signal (EMP) to the ADF controller PCB.

In response, the ADF controller PCB generates the original set indicator ON signal (OGLED) to turn not the Original Set indicator (U507).

ADF controller PCB

U507

Original set indicator

ON signal (OGLED)

Original Set sensor Original

Original Set indictor LED

U503

Figure 2-202

Prism

Original tray paper

detection signal (EMP)

2-6

CHAPTER 2 BASIC OPERATION

b. Identifying the Size of an Original

The ADF identifies the size of an original in terms of length (feeding direction) and width.

The length is computed in reference to the number of clock signals from the preregistration sensor (U502) and the registration roller.

When the pre-registration sensor detects the leading edge of an original (ON) and the trailing edge (OFF), the ADF controller computes the time taken by the original to move past the pre-registration sensor with reference to the number of clock signals from the feed motor clock sensor (SR1) to find out the size in the lengthwise direction (feeding direction).

The ADF controller uses the result to identify a default size, and communicates it to the copier so that copy paper of the appropriate size may be selected.

The ADF refers to the original width detecting volume (U508) located inside the original tray to find out the width of an original.

The original width detecting volume operates in conjunction with the slide guides, and the resistance of the voltage varies in analog mode. The ADF controller uses changes occurring in the resistance as the original size detection signal (WIDE), and uses them to find out the width of a specific original.

Original width detecting volume

ADF controller PCB

Prism

Registration roller

Pre-registration sensor

U502

BK

Original

Feed motor

M2 SR4

(FMCK)

Feed motor clock signal

Original tray paper detection signal

(ENT)

Figure 2-204

Feed motor clock sensor

Figure 2-203

2-7

CHAPTER 2 BASIC OPERATION

Default size Length (mm) Width (mm)

B5R A5 A4R B5 B4 COMPUTER A4 A3

237 to 297 128 to 188 277 to 317 162 to 222 344 to 404 361 to 421 190 to 250 400 to 460

180 to 184 208 to 212

255 to 259

277.4 to 281.4 295 to 299

Default size Length (mm) Width (mm)

STMT LTRR FLSC LGL LTR COMPUTER 11x17

(297.4 to 431.8)

120 to 180 259 to 309 310 to 343 343 to 396 196 to 256 361 to 411 412 to 472

213.9 to 217.9

277.4 to 281.4

· Slide Guide Lock

The ADF is equipped with a slide guide lock so that the slide guides will not move any farther than 297 mm (A4 length or A3 width).

If an original larger than 297 mm is used, the slide guide lock may be released (to accommodate up to 305 mm). The length of the original, nevertheless, must be 32 mm or less.

The copier assumes that any original is an original of a default size based on the data on length and width from the ADF. Tables 2-201,

-202, and -203 show the default sizes that the copier will assume in reference to the length and width data.

· A/B-Configured ADF

Figure 2-205

A default size is identified in reference to ±10 mm for the length of an original, and ±5 mm for the width. Any lengths or widths falling outside these ranges will be assumed to represent a non-default size original.

Table 2-201

· Inch-Configured ADF

2-8

A default size is identified in reference to ±10 mm for the length of an original, and±5 mm for the width. Any lengths or widths falling outside these ranges will be assumed to represent a non-default size original.

Table 2-202

CHAPTER 2 BASIC OPERATION

U504

U502

Last original sensor

ADF controller PCB

Prism

Original

Pre-registration sensor

Last original detection signal

(LAST)

Last original sensor

Original

Original tray

· Inch/A/B-Configured ADF

Default size Length (mm) Width (mm)

B5R A5 A4R STMT LTRR FLSC LGL B5 B4 LTR COMPUTER 11x17

(297.4 to 431.8)

A4

237 to 297 128 to 188 277 to 337 120 to 180 259 to 309 310 to 343 343 to 396 162 to 222 344 to 404 196 to 256 361 to 411 412 to 472 190 to 250

180 to 184 208 to 212

213.9 to 217.9

255 to 259

277.4 to 281.4

295 to 299

assume the original as the last original and sends the last original detection signal (LAST) to the copier so as to prevent pickup of copy paper.

Last Original Detection and Original Sizes

default size: B5, A4, LTR

length: 170 to 190 mm; 205 to

226 mm

A3

400 to 460

A default size is identified in reference to ±10 mm for the length of an original, and ±5 mm for the width. Any lengths or widths falling outside these ranges will be assumed to represent a non-default size original.

Table 2-203

c. Identifying the last Original

A copier with a long paper path (from cassette to drum) is designed to pick up copy paper early to enable faster copying operation. As such, when the ADF picks up the last original and places it on the copyboard glass, the copier may already have finished picking up copy paper.

The ADF moves the second original as far as the pre-registration sensor immediately after it picks up the first original (advance separation). If the last original sensor does not detect an original, the ADF controller will

Figure 2-206

Figure 2-207

2-9

CHAPTER 2 BASIC OPERATION

· Counting Originals

The number of times that the registration sensor has turned on in response to the trailing edge of an original is used as the number of originals.

The ADF is not equipped with an original feed mode for counting originals when making double-sided copies of single-sided originals. The originals are copied in order of how they are picked up and delivered accordingly.

2-10

CHAPTER 2 BASIC OPERATION

C. Picking Up and Separating Originals

1. Outline

The pickup roller and the lifter are moved up so as to hold the entire stack of originals, and the separation roller is rotated. When this takes place while the stack is butted against the separation pad, the topmost sheet is separated from the rest of the stack.

The pickup roller is moved down and the lifter is moved up by rotating the separation motor (M1) counterclockwise. On the other hand, the pickup roller is moved up, the lifter is moved down, and the separation roller is turned by rotating the separation motor (M1) clockwise.

The separation assembly is equipped with a separation sensor (SR3) to monitor the movement of originals.

When the copier’s Copy Start key is pressed while originals are placed on the original tray, the originals are picked up and separated in the following sequence of operations:

Separation sensor

Registration roller

Separation roller

Pickup roller

Lifter

Separation pad

Pre-registration sensor

Figure 2-208

2-11

CHAPTER 2 BASIC OPERATION

1. Starting Ascent (pre-separation)

When the separation motor (M1) rotates counterclockwise, the lifter moves up to hold up the entire stack of originals from under, while at the same time the pickup roller moves down onto the stack to hold it in place.

The separation motor rotates counterclockwise for 250 msec and then stops.

Figure 2-209

3. Arching

The original is butted against the registration roller, and is made to arch. The separation roller stops to rotate 52 msec after the pre-registration sensor (U502) detects the leading edge of the original.

Figure 2-211

2. Pickup/Separation Operations

When the separation motor (M1) rotates clockwise, its drive reaches the pickup roller and the separation roller and, as a result, the first (topmost) original is picked up. The separation pad is used to make sure that only one original is separated and moved to the registration roller.

At the end of this operation, the lifter starts to move down, and then the pickup roller moves up.

2-12

Figure 2-210

CHAPTER 2 BASIC OPERATION

2. Moving Up the Pickup Roller Unit

The pickup roller and the lifter are designed to operate (move up and down) in conjunction with

the separation motor (M1).

■ Separation Motor Rotating Counterclockwise

When the separation motor rotates counterclockwise, the work of a cam disengages the lock used

to keep the pickup roller in place, and the pickup roller starts to move down on its own weight.

In addition, the drive reaches the arm of the lifter, causing the lifter to move up. This operation

moves up the originals while they are held intact in preparation for pickup operation.

Separation motor

Pickup roller

Lifter

Counter clockwise

Separation roller

Figure 2-212

When the separation motor (M1) rotates clockwise, the work of the cam moves down the lifter, and then the pickup roller returns to the ascent position. When the separation motor is rotating clockwise, the work of the one-way clutch lets the rotation drive of the separation motor (M1) to reach the separation roller and the pickup roller. When the separation motor rotates counterclockwise, its rotation drive will not reach the separation roller or the pickup roller.

■ Separation Motor Rotating Clockwise

Separation motor

Clockwise

Pickup roller

Separation roller

Lifter

Figure 2-213

2-13

CHAPTER 2 BASIC OPERATION

1. When the copier’s Copy Start key is pressed, the separation motor (M1) starts to rotate counterclockwise. In response, the lock used to keep the pickup roller in place becomes disengaged, and the pickup roller falls down on the original on its own weight. The work of a cam, on the other hand, moves up the lifter and, consequently, the original. The separation motor rotates counterclockwise for 250 msec and then stops to end ascent.

M1

3. A moment after the separation motor starts to rotate clockwise, the lifter starts to move down by the work of the cam. Then, the pickup roller starts to move up while rotating, returning to its initial position.

M1

Figure 2-216

Figure 2-214

2. When the pickup roller stops moving down and the lifter stops moving up, the separation motor starts to rotate clockwise so that its rotation drives the separation roller and the pickup roller, moving the first original to the separation assembly.

M1

4. When the pre-registration sensor (U502) detects the trailing edge of the original (OFF), the separation motor starts to rotate counterclockwise once again. In response, the lock used to keep the pickup roller in place becomes disengaged, and the pickup roller falls down onto the original on its own weight. The work of the cam, on the other hand, moves up the lifter to hold up the original.

M1

2-14

Figure 2-217

Figure 2-215

CHAPTER 2 BASIC OPERATION

Not detected by the separation sensor within a specific time

Separation sensor (SR3)

Detected by the separation sensor within a specific time

Separation sensor

3. Separation Sensor (SR3)

The original feeding path is equipped with a separation sensor (SR3) to monitor the movement of

originals.

If the separation sensor does not detect an original a specific time after the separation motor has started to rotate clockwise to move an original, the ADF controller will assume the condition as a separation fault (delay), and will stop the machine and cause the copier to indicate the Jam message.

Figure 2-218

2-15

CHAPTER 2 BASIC OPERATION

4. Controlling the Separation Motor (M1)

Figure 2-219 is a diagram of the control circuit used for the separtion motor (M1).

The separation motor is a DC motor, and the CPU (Q1) on the ADF controller PCB sends the separation motor rotation speed control signal (SMPWM) and the separation motor rotation direction signal (SMFWD, SMREV) to the drive circuit, which in response drives the separation motor.

The control circuit does no possess a circuit designed to communicate the state of the separation motor back to the CPU (Q1). The rotation speed control signal (SMPWM) remains the same at all times, and no correction is made even when changes occur in the rotation speed of the separation motor because of external force.

ADF controller PCB

Separation

SMPWM J5F-1

motor

SMFWD SMREV

Q1

CPU

Drive circuit

M1

J5F-2

Figure 2-219

The relationship between the separation motor rotation speed control signal (SMPWM), the separation motor rotation direction signal (SMFWD, SMREV), and the separation motor is as shown in Table 2-204.

Separation motor rotation speed control signal (SMPWM)

’0’ ’1’ ’1’

2-16

Separation motor rotation direction signal (SMFWD)

’0’ ’0’ ’1’

Table 2-204

Separation motor rotation direction signal (SMREV)

’0’ ’1’ ’0’

Separation motor operation

Stops Rotates CW Rotates CCW

5. Sequence of Operations (pickup assembly)

Separation sensor (SR3)

Separation motor

Copying started

Pre-registration sensor ON

Reversal inlet sensor ON

Lifter ascent

Pickup roller ascent

CCW

CW

CCW

CW

Pickup roller rotation Separation roller rotation

Pre-registration sensor (U502)

Original leading edge detected

Original trailing edge detected

Original leading edge detected

Original trailing edge detected

Down Up

Up Down

Down Up

Up Down

(separation roller)

(pickup roller holder)

CHAPTER 2 BASIC OPERATION

Figure 2-220

2-17

CHAPTER 2 BASIC OPERATION

D. Moving Originals

1. Outline

The drive of the feed motor (M2) is used to rotate the registration roller and the feed belt drive roller, thereby moving originals.

Originals are moved in normal or reverse direction according to the size of the original (small, large) and operating mode (single-sided, double-sided).

Pre-registration sensor

Registration roller

Feed belt drive roller

BK

Feed motor brake

Feed motor

M2

Feed belt

Feed belt link roller

Retaining roll

Figure 2-221

2-18

CHAPTER 2 BASIC OPERATION

1. Starting to Move an Original

When an original has been picked up and moved to the separation assembly, the feed motor (M2) is rotated clockwise. Its drive reaches the registration roller and the feed belt link roller, and the original is moved to the copyboard glass.

Figure 2-222

2. Slowing Down the Movement

When the pre-registration sensor (U502) detects the trailing edge of an original (OFF), the length (in feeding direction) of the original is computed from the time of detection by the pre-registration sensor and the number of clocks from the feed motor.

At the same time, the movement is decelerated gradually so that the trailing edge of the original is moved to the image leading edge position on the copyboard glass.

Figure 2-223

2-19

CHAPTER 2 BASIC OPERATION

3. Stopping the Movement (start of copying)

When the original reaches the image leading edge position on the copyboard glass, the feed

motor brake (CL) is turned on to stop its movement.

If the original is a small-size original (continuous feeding), the next original is picked up at that

point in time, and is butted against the registration roller.

If the original is a large-size original (or mixed sizes), the next original is picked up when the

scanner ended its forward movement.

Figure 2-224

4. Starting Delivery (end of copying)

When the copier has ended its scanning operation, the feed motor (M2) is rotated clockwise once again to rotate the registration roller and the feed belt drive roller so that the original is moved to the reversal delivery assembly.

If the original is a small-size original (continuous feeding), the original is moved to the right half of the copyboard glass; if it is a large-size original, on the other hand, it is moved to the reversal delivery assembly.

2-20

Figure 2-225

CHAPTER 2 BASIC OPERATION

2. Controlling the Feed Motor (M2)

Figure 2-225 is a diagram of the control circuit used for the feed motor (M2).

The feed motor is a DC motor. The CPU (Q1) on the ADF controller PCB sends the feed motor rotation speed control signal (FMPWM) and the feed motor rotation direction signal (FMFWD, FMREV) to the drive circuit, which in response drives the feed motor.

When the feed motor (M1) starts to rotate, the feed motor clock sensor (SR1) turns on to send the feed motor lock signal (FMCK) to the CPU (Q1). In response, the CPU (Q1) compares the rotation speed that has been selected in advance and the feed motor clock signals (FMCK), and varies the feed motor rotation speed control signal (FMPWM) to enable the selected speed.

ADF controller PCB

Feed motor

FMPWM J5F-3 FMFWD FMREV

Q1

CPU

FMCK

Drive circuit

M2

J5F-4

SR1

Feed motor clock sensor

Figure 2-226

The relationship between the feed motor rotation speed control signal (FMPWM), feed motor rotation direction signal (FMFWD, FMREV), and feed motor is as follows:

Feed motor rotation speed control signal (FMPWM)

’0’ ’1’ ’1’

Feed motor rotation direction signal (FMFWD)

’0’ ’0’ ’1’

Feed motor rotation direction signal (FMREV)

’0’ ’1’ ’0’

Feed motor operation

Stops Rotates CW Rotates CCW

Table 2-205

2-21

CHAPTER 2 BASIC OPERATION

3. Sequence of Operations (feeding assembly)

Pre-registration sensor (U502)

Feed motor (M2)

Brake (BK1)

Original leading edge detected

Original trailing edge detected

Registration sensor OFF

Slow down

CW CW

(scanning)

Original leading edge detected

Figure 2-227

Original trailing edge detected

Registration sensor OFF

Slow down

(scanning)

2-22

CHAPTER 2 BASIC OPERATION

E. Turning Over an Original/Delivery

1. Outline

An original is delivered by the reversal delivery roller and the reversal delivery link roller using the drive of the reversal delivery motor (M3).

The ADF moves an original by the reversal delivery roller in feeding direction, switches the feeding path, and rotates the reversal delivery motor counterclockwise to start delivery. In other words, originals are delivered to the delivery tray face down, starting with the first page.

The feeding path is switched by opening and closing two flappers. The reversal delivery registration sensor and the delivery sensor operate in conjunction with the two levers located in the feeding path, and turn on or off according to the direction of rotation of the reversal delivery motor.

M3

Reversal delivery

roller Reversal delivery link roller

Reversal delivery registration roller

Delivery roller

Reversal delivery outlet sensor

Figure 2-228

Reversal delivery flapper (upper)

Reversal delivery

registration sensor Reversal delivery flapper (down)

Reversal delivery inlet sensor

2-23

CHAPTER 2 BASIC OPERATION

a. Small-Size (A5, A4, B5, STMT, LTR)

If the original is a small-size original, the reversal delivery motor (M3) is rotated clockwise so that the original is moved to the small-size switch-back position; then, it is delivered to the delivery tray face down by rotating the reversal delivery motor counterclockwise.

1. Starting Delivery

When the copier ends scanning, the original on the copyboard glass is moved to the reversal delivery assembly by rotating the feed motor (M2) clockwise once again.

2. Delivery (clockwise rotation)

When the reversal delivery registration sensor (SR5) detects the leading edge of an original (ON), the reversal delivery motor (M3) rotates clockwise to move the original to the reversal delivery assembly.

At this time, the reversal delivery motor is rotated clockwise so that the original is moved to the path where the flapper is closed.

Figure 2-230

Figure 2-229

3. Delivery (counterclockwise rotation)

When the reversal delivery registration sensor (SR5) detects the leading edge of an original (OFF), the reversal delivery motor (M3) moves the original over a specific distance (until the leading edge of the original reaches the switch-back position), and stops.

Figure 2-231

2-24

CHAPTER 2 BASIC OPERATION

4. Controlling Deceleration

The reversal delivery motor (M3) starts to move counterclockwise when the original reaches and stops at the switch-back position. The reversal delivery motor rotates counterclockwise, and the original is moved to the feeding path where the flapper is open.

The reversal delivery motor is controlled for deceleration when an original has been moved over a specific distance after the delivery sensor (SR5) detects its leading edge.

b. Large-Size Originals (A4R, B5R, A3,

B4, LTRR, LGL, 11X17)

If the original is a large-size original, the reversal delivery motor (M3) is rotated clockwise to move the original to the large-size reversal position; then, the reversal delivery motor is rotated counterclockwise to move the original to the delivery tray face down.

1. Start of Delivery

When the copier ends scanning operation, the original on the copyboard glass is moved to the reversal delivery assembly by rotating the feed motor (M2) clockwise once again.

Figure 2-232

5. End of Delivery

The reversal delivery motor (M3) is decelerated, and then is rotated counterclockwise until the original reaches the delivery tray (face down), at which time it is stopped.

When the reversal delivery motor has stopped, it is rotated clockwise once again for an equivalent of 60 mm to close the flapper.

Figure 2-234

Figure 2-233

2-25

CHAPTER 2 BASIC OPERATION

2. Delivery (clockwise rotation)

When the reversal delivery inlet sensor (SR4) detects the leading edge of an original (ON), the reversal delivery motor (M3) rotates clockwise to move the original to the reversal delivery assembly.

At this time, the reversal delivery motor rotates clockwise so that the original is moved to the paper path where the flapper is closed.

Figure 2-235

4. End of Reversal

When the reversal outlet sensor (U505) detects the trailing edge of an original (OFF), the feed motor (M2) moves the original over a specific distance (until the leading edge of an original reaches the reversal stop position, and stops.

Figure 2-237

3. Start of Reversal

When the reversal outlet sensor (U505) detects the leading edge of an original (ON), the feed motor (M2) rotates to move the original back to the original glass.

Figure 2-236

5. Switching the Feeding Path

When the original has stopped at the reversal stop position, the reversal delivery motor (M3) is rotated counterclockwise for an equivalent of 60 mm to keep the flapper open.

Figure 2-238

2-26

6. Deceleration Control

When the flapper opens, the feed motor (M2) starts to move clockwise, and the reversal delivery motor (M3) starts to move counterclockwise to deliver the original to the delivery tray.

When the reversal inlet sensor (SR4) detects the leading edge of an original (ON), the feed motor starts counting; as soon as the original leaves the retaining roll, the count is incremented, and the reversal delivery motor (M3) is subjected to deceleration control.

CHAPTER 2 BASIC OPERATION

Figure 2-239

7. End of Delivery

After deceleration control, the reversal delivery motor (M3) rotates counterclockwise until the original reaches the delivery tray (face down), at which time it stops.

The reversal delivery motor stops, and then it rotates for an equivalent of 60 mm once again to close the flapper.

Figure 2-240

2-27

CHAPTER 2 BASIC OPERATION

Large-size delivery

Small-size delivery

2. Operation of the Reversal Delivery Flapper

The reversal delivery flapper consists of three flappers as shown, and operates (opens and closes)

in conjunction with the reversal delivery motor (M3).

When the reversal delivery motor rotates counterclockwise, the flapper opens; when the motor

rotates clockwise, on the other hand, it closes, switching the feed path.

Delivery roller

Reversal delivery flapper (upper)

Reversal delivery flapper (lower)

Figure 2-241

■ Reversal Delivery Motor Clockwise Rotation

When the reversal delivery motor (M3)

rotates clockwise, the three flappers close, and the paper path will be as follows:

■ Reversal Delivery Motor (counterclockwise rotation)

When the reversal delivery motor (M3)

rotates counterclockwise, the three flappers open, and the paper path will be as follows:

Reversal delivery flapper closed

2-28

Figure 2-242 Figure 2-243

CHAPTER 2 BASIC OPERATION

3. Controlling the Reversal Delivery Motor (M3)

Figure 2-243 is a diagram of the control circuit used for the reversal delivery motor (M3).

The reversal delivery motor is a DC motor. The CPU (Q1) on the ADF controller PCB sends the reversal delivery motor rotation speed control signal (EMPWM) and the reversal delivery motor rotation direction signal (EMFWD, EMREV) to the drive circuit, which in response drives the reversal delivery motor.

When the reversal delivery motor (M3) rotates, the reversal delivery motor clock sensor (SR7) turns on to send the reversal delivery motor clock signal (EMCK) to the CPU (Q1).

The CPU (Q1) compares the rotation speed selected in advance and the reversal delivery motor clock signal (FMCK), and varies the reversal delivery motor rotation speed control signal (EMPWM) to suit the selected speed.

ADF controller PCB

Reversal delivery

EMPWM J9F-1

motor

EMFWD EMREV

Q1

CPU

EMCK

Drive circuit

M3

J9F-2

SR7

Reversal delivery motor clock sensor

Figure 2-244

The relationship between the reversal delivery motor rotation speed control signal (EMPWM), reversal motor rotation direction signal (EMFWD, EMREV), and reversal delivery motor is as follows:

Reversal delivery motor rotation speed control signal (EMPWM)

’0’ ’1’ ’1’

Reversal delivery motor rotation speed signal (EMFWD)

’0’ ’0’ ’1’

Reversal delivery motor rotation direction signal (EMREV)

’0’ ’1’ ’0’

Reversal delivery motor operation

Stops Rotates CW Rotates CCW

Table 2-206

2-29

CHAPTER 2 BASIC OPERATION

4. Sequence of Operations (reversal delivery assembly)

a. Small-Size Originals

Feed motor (M2)

Brake (BK1)

Slow down

Reversal delivery motor (M3)

Reversal delivery flapper (open/close)

Reversal registration sensor (SR4)

Delivery sensor

Pre-registration sensor OFF

Slow down

CW CW

Reversal registration sensor ON OFF

CWCW CW CWCW

Closes Opens Closes Opens

(scanning) (scanning)

Delivery sensor OFF

Slow down

CCW CCW

Reversal registration sensor ON OFF

Pre-registration sensor OFF

Slow down

Delivery sensor OFF

Slow down

Reversal delivery inlet sensor (SR4)

Figure 2-245

2-30

b. Large-Size Originals

CHAPTER 2 BASIC OPERATION

Pre-registration sensor OFF

Feed motor (M2)

Brake (BK1)

Reversal delivery motor (M3)

Reversal delivery flapper (open/close)

Reversal delivery inlet sensor (SR4)

Reversal delivery registration sensor (SR5)

Reversal delivery outlet sensor (U505)

Slow down

CW CCW CCWCWCW

Reversal delivery inlet sensor ON

Slow down Slow down

Closes ClosesOpens Opens

Reversal delivery outlet sensor ON OFF

CWCW CWCW CW CWCWCW

CCW CCW

(scanning)

Closes

Reversal delivery inlet sensor ON

Reversal delivery outlet sensor ON OFF

Figure 2-246

2-31

CHAPTER 2 BASIC OPERATION

F. Movement of Originals

1. Small-Size Originals (continuous feeding, single-sided)

When making single-sided copies of small-size originals, the second original is picked up as soon

as the first original is sent to the copyboard glass.

The original sent to the copyboard glass is scanned, and then moved to the right, while the next

original is sent to the copyboard glass.

1. When the Copy Start key is pressed, the separation motor (M1) rotates counterclockwise for a limited time, causing the pickup roller to move down and the lifter to move up (in wait for pickup).

Figure 2-247

2. The separation motor (M1) stops once, and then starts to rotate clockwise so that the separation roller and the pickup roller rotate to separate the first original. The lifter starts to move down, and then the pickup roller starts to move up. The separation motor stops when the pre-registration sensor (U502) detects the leading edge of an original (ON).

Figure 2-248

3) The feed motor (M2) rotates clockwise, and the original is moved to the copyboard glass. When the pre-registration sensor (U502) detects the trailing edge of an original (OFF), the ADF is in wait for pickup of the next original.

2-32

Figure 2-249

CHAPTER 2 BASIC OPERATION

4. When the pre-registration sensor (U502) detects the trailing edge of an original (OFF), the feed motor (M2) starts to slow down. The feed motor stops when the trailing edge of the original reaches the image leading position, and scanning starts when the original reaches a specific position. At this time, the next original is put through separation operation.

Figure 2-250

5. When the first original has been scanned, the feed motor (M2) rotates clockwise to move the original to the right. At the same time, the next original is moved to the copyboard glass. When the pre-registration sensor (U502) detects the trailing edge of the next original (OFF), the feed motor (M2) starts to slow down. The feed motor stops when the trailing edge of the next original reaches the image leading edge position, and scanning starts when the next original reaches a specific position.

Figure 2-251

6. When the reversal delivery registration sensor (SR5) detects the leading edge of an original (ON), the reversal delivery motor (M3) starts to rotate clockwise. When the reversal delivery motor is rotating clockwise, the reversal delivery flapper remains closed.

Figure 2-252

2-33

CHAPTER 2 BASIC OPERATION

7. When the reversal delivery registration sensor (SR5) detects the leading edge of the original (OFF), the reversal delivery motor (M3) moves the original over a specific distance (to the switch-back position), stops, and starts to rotate counterclockwise. When the reversal delivery motor rotates counterclockwise, the reversal delivery flapper opens to switch the paper path.

Figure 2-253

8. The reversal delivery motor (M3) rotates counterclockwise so that the first original is sent to the delivery tray. The reversal delivery motor starts to slow down when the delivery sensor (SR5) detects the trailing edge of the original (OFF).

Figure 2-254

9. The reversal delivery motor (M3) stops when the original reaches the delivery tray. The reversal delivery motor then stops, and then starts to rotate clockwise for a limited time so that the reversal delivery flapper closes.

Figure 2-255

2-34

CHAPTER 2 BASIC OPERATION

2. Large-Size Originals (single-sided)

When making single-sided copies of large-size originals, the second original is sent to the copyboard glass after the first original has been delivered. In the case of large-size originals, delivery occurs after the original moved to the reversal delivery assembly is turned over and returned to the copyboard glass.

1. When the Copy Start key is pressed, the separation motor (M1) rotates counterclockwise for a

limited time so that the pickup roller moves down and the lifter moves up (in wait for pickup).

Figure 2-256

2. The separation motor (M1) stops once, and then starts to rotate clockwise so that the separation

roller and the pickup roller rotate to separate the first original.

The lifter starts to move down, and then the pickup roller starts to move up.

The separation motor stops when the pre-registration sensor (U502) detects the leading edge of

the original (ON).

Figure 2-257

3. The feed motor (M2) rotates clockwise, and the original is moved to the copyboard glass. When

the pre-registration sensor (U502) detects the trailing edge of the original (OFF), the ADF will be

in wait for pickup.

Figure 2-258

2-35

CHAPTER 2 BASIC OPERATION

4. When the pre-registration sensor (U502) detects the trailing edge of the original (OFF), the feed motor (M2) slows down. The feed motor stops when the trailing edge of the original reaches the image leading edge position, and scanning starts when the original reaches and stops at a specific position.

Figure 2-259

5. When scanning ends, the 2nd original is separated; the separation motor is stopped once 100 msec after the separation sensor has turned on. When the reversal inlet sensor (SR5) detects the leading edge of the original (ON), the reversal delivery motor (M3) starts to rotate clockwise. The reversal delivery flapper remains closed while the reversal delivery motor is rotating clockwise.

Separation sensor

Figure 2-260

6. When the reversal delivery outlet sensor (U505) detects the leading edge of the original (ON), the feed motor (M2) stops, and then starts to rotate counterclockwise, moving the original to the copyboard glass.

Figure 2-261

2-36

CHAPTER 2 BASIC OPERATION

7. When the reversal outlet sensor (U505) detects the trailing edge of the original (FF), the feed motor (M2) moves the original over a specific distance (until the trailing edge of the original reaches the reversal stop position), and then stops. The feed motor stops once, and then the reversal delivery motor rotates counterclockwise for a limited time so that the reversal delivery flapper opens to switch the paper path. The separation motor (M1) rotates clockwise to rotate the separation roll and the pickup roller, thereby separating the first original.

Figure 2-262

8. When pickup ends, the feed motor (M1) starts to rotate clockwise; the reversal delivery motor (M3), on the other hand, starts to rotate counterclockwise. The first original is sent to the delivery tray, and at the same time the next original is moved to the copyboard glass. When the reversal delivery inlet sensor (SR4) detects the leading edge of the original (ON), and the original has been moved over a specific distance, the reversal delivery motor starts to slow down.

Figure 2-263

9. When the pre-registration sensor (U502) detects the trailing edge of the next original (OFF), the feed motor (M2) slows down; the motor stops when the trailing edge of the next original reaches the image leading edge position. When the reversal delivery inlet sensor (SR4) detects the leading edge of the first original, and the original is moved over a specific distance, the reversal delivery motor (M3) slows down and stops when the original reaches the delivery tray. The reversal delivery motor stops once, and then rotates clockwise so that the reversal delivery flapper closes.

Figure 2-263

2-37

CHAPTER 2 BASIC OPERATION

3. Duplexing Copying Mode

When making double-sided copies, the face of an original is scanned, and the original is turned over while it is moved through the reversal delivery assembly; thereafter, the original is returned to the pre-registration sensor (U502) once, and matched against the image leading edge position on the copyboard glass, and its back is scanned before delivery.

1. When the Copy Start key is pressed, the separation motor (M1) rotates counterclockwise for a

limited time so that the pickup roller moves down and the lifter moves up (in wait for pickup).

Figure 2-265

2. The separation motor stops once, and then starts to rotate clockwise so that the separation roller

and the pickup roller rotate to separate the first original.

The lifter starts to move down, and then the pickup roller starts to move up.

When the pre-registration sensor (U502) detects the leading edge of the original (ON), the

separation motor stops.

Figure 2-266

3. The feed motor (M2) rotates clockwise, and the original is moved to the copyboard glass. When

the pre-registration sensor (U502) detects the trailing edge of the original (OFF), the ADF will be

in wait for pickup.

2-38

Figure 2-267

CHAPTER 2 BASIC OPERATION

4. When the pre-registration sensor (U502) detects the trailing edge of the original (OF), the feed motor (M2) starts to slow down. The feed motor stops when the original reaches the image leading edge position, at which time its face is scanned.

Figure 2-268

5. When scanning ends, the feed motor (M2) rotates clockwise, and the original is moved to the reversal delivery assembly. When the reversal inlet sensor (SR4) detects the leading edge of the original (ON), the reversal delivery motor (M3) starts to rotate. The reversal delivery flapper remains closed while the reversal delivery motor is rotating clockwise.

Figure 2-269

6. When the reversal outlet sensor (U505) detects the leading edge of the original (ON), the feed motor (M2) stops once, and starts to rotate counterclockwise, causing the original to reach the copyboard glass face down.

Figure 2-270

2-39

CHAPTER 2 BASIC OPERATION

7. The original is moved to the copyboard glass and then to the pickup assembly. When the preregistration sensor (U502) detects the leading edge of the original, the feed motor (M2) stops.

Figure 2-271

8. The feed motor stops once, and starts to rotate clockwise. When the pre-registration sensor (U502) detects the leading edge of the original (OFF), the feed motor (M2) starts to slow down. The feed motor stops when the leading edge of the original reaches the image leading edge position.

Figure 2-272

9. When the original reaches a specific position, the reversal delivery motor (M3) rotates counterclockwise for a limited time so that the reversal delivery flapper opens to switch the paper path. The back of the original is then scanned.

Figure 2-273

2-40

CHAPTER 2 BASIC OPERATION

10. When scanning ends and separation of the 2nd original starts, the feed motor (M2) starts to rotate clockwise, moving the 1st original to the right side.

Figure 2-274

11. When the feed motor stops, the separation motor (M1) rotates clockwise to separate the original. When the pre-registration sensor (U502) detects the leading edge of the original (ON), the separation motor stops.

Figure 2-275

12. After the separation motor stops, the feed motor (M2) starts to rotate clockwise while the reversal delivery motor (M3) starts to rotate counterclockwise. The first original is moved to the delivery tray, and the next original is moved to the copyboard glass.

Figure 2-276

2-41

CHAPTER 2 BASIC OPERATION

13. When the pre-registration sensor (U502) detects the trailing edge of the next original (OFF), the feed motor (M2) slows down and stops as soon as the trailing edge of the original reaches the image leading edge position. When the reversal delivery inlet sensor (SR4) detects the leading edge of the first original (ON) and the original is then moved over a specific distance, the reversal delivery motor (M3) slows down and stops as soon as the original reaches the original delivery tray. The reversal delivery motor stops once, and rotates clockwise for a limited time so that the reversal delivery flapper closes.

Figure 2-277

4. Mixed Sizes

The ADF allows placement of originals of different sizes (but of the same configuration width).

Regardless of whether they are small- or large-size, the second original is sent to the copyboard glass only after the first original has been delivered. The mode of operation is the same as the mode used for large-size paper or the last of double-sided copying.

5. Jam Removal Mode

When a jam occurs, the originals that may have been copied and that remain on the copyboard

glass are moved without specific operation. The flow of originals is the same as when making singlesided copies, but scanning does not take place.

2-42

CHAPTER 2 BASIC OPERATION

G. Detecting an Original Jam

The ADF uses the following sensors to check for original jams. The timing at which checks are made is stored in advance in the CPU (Q1) on the ADF controller PCB, and a jam is identified in relation to the presence/absence of paper over a specific sensor.

In response to a jam, the ADF communicates to the copier in the form of a code, which may be checked in the copier’s service mode (COPIER>DISPLAY>JAM).

Service Mode Screen (copier)

Display

< JAM >

AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII AA BBBB CCCC DDDD E FFFF G HHHHHH IIIII

I/O

Adjust

Function

< 1/7 > < READY >

Option Test

+/-

'1' indicates that the jam is in the ADF.

OK

Jam code

Counter

Figure 2-278

SR3

U503

SR2

U504

SR8

U505

SR2...... pickup unit cover sensor

SR3...... separation sensor

SR4...... reversal inlet sensor

SR5...... reversal registration sensor/

delivery sensor

SR6...... ADF open/closed sensor

SR8...... reversal delivery

unit cover sensor

U502....pre-registration sensor

U503....original set sensor

U504....last original sensor

U505....reversal outlet sensor

U502

U508

SR5

SR4

U508....original detecting volume

Figure 2-279

2-43

CHAPTER 2 BASIC OPERATION

Note:

1. Response to a Jam The ADF is stopped immediately in response to any of the jams in Table 2-207.

2. Resetting after a Jam For a pickup delay jam, remove the originals from the original tray to reset the ADF. For other types of jams, remove the originals from the original tray and from inside the ADF; then, open and close the ADF to reset.

3. An alarm indication will turn on when either of the following is executed:

· mixed size operation without selecting mixed size mode

· copying stapled originals If the original must be removed from inside the machine, both jam and alarm indications will be turned on. For example, the "Alarm and 8C Jam" indications may be turned on at the same time. The alarm indication will remain for 5 sec after removal of the jam and, thereafter, the alarm will automatically turn off.

2-44

CHAPTER 2 BASIC OPERATION

The sensors and conditions used to identify jams are as follows:

Jam Code Sensor Condition

Separation delay 0002 SR3 The separation sensor (SR3) does not turn on within 50

Pickup delay 0003 U502 The pre-registration sensor (U502) does not turn on within 1 sec

Pickup stationary 0005 U502

Separation timing

Reversal outlet delay

Reversal outlet stationary

Duplexing preregistration sensor delay

Delivery inlet delay 0041 SR4 The reversal inlet sensor (SR4) does not turn on when the feed

Delivery stationary 0042 SR4 The reversal inlet sensor (SR5) does not turn off a specific time

0006 SR3

0011 U505 The reversal outlet sensor (U505) does not turn on a specific

0012 U505 The reversal outlet sensor (U505) does not turn on when the

0023 U502 The pre-registration sensor (U502) does not turn on a specific

msec after the separation motor (M1) has started to rotate.

after the original has left the separation sensor (SR3) in the case of a small-size original or a point near the separation sensor in the case of a large-size original.

The pre-registration sensor (U502) does not turn off when the feed motor has rotated for 500 msec after the original was made to arch at the registration roller.

The separation sensor (SR3) is on when separation of the original starts.

time after the trailing edge of the original has moved past the right edge of the belt registration roller.

delivery motor has rotated for 500 msec after the reversal registration sensor (SR5) detected the trailing edge of the original.

time after the double-sided original has been moved to the pickup unit side from the copyboard glass after it was turned over.

motor (M2) has been rotated for an equivalent of 10 mm after the original is picked up in the case of a small-size original or from a point 51 mm of the reversal inlet sensor (SR4) in the case of a large-size/double-sided original.

after the leading edge of the original has reached the reversal registration roller nip in the case of a small-size original or after the leading edge of the original has reached the reversal outlet sensor (U505) in the case of a large-size/double-sided original.

Reversal registration delay

Reversal registration stationary

Reversal flapper fault

Delivery sensor delay (small-size)

Delivery sensor stationary (small-size)

Delivery sensor delay (large-size, double-sided)

0043 SR5 The reversal registrations sensor (SR5) does not turn on a

specific time after the reversal inlet sensor (SR4) has turned don.

0044 SR5 The reversal registration sensor (SR5) doe not turn off a

specific time after the reversal inlet sensor (SR4) has turned off.

0045 U505 The flapper is not switched when the reversal outlet sensor

(U505) checks the switch-over at each delivery.

0046 SR5 The delivery sensor (SR5) does not turn off within a specific time

after the reversal delivery motor (M3) has started to rotate counterclockwise.

0047 SR5 The delivery sensor (SR5) does not turn off when the trailing

edge of the original has been fed 50 mm after it has moved past the delivery sensor (SR5).

0048 SR4 The reversal inlet sensor (SR5) doe not turn on a specific period

after delivery has started.

Table 2-207-1

2-45

CHAPTER 2 BASIC OPERATION

Jam Code Sensor Condition

Reversal delivery unit cover open

ADF open 0081 SR6 The ADF is opened while the copier is at rest in the absence of

Pickup cover open 0082 SR2 The pickup unit cover is opened while the copier is at rest in the

Residual original 0088 SR4,SR5 An attempt at pickup is made with an original on the copyboard

Timing fault 1 008A When making a double-sided copy, pickup timing for the second

Timing fault 2 008B When originals are fed continuously, a second original has been

Timing fault 3 008C

User ADF open 0091 SR6 The ADF is opened while the ADF is in operation.

0080 SR8 The reversal delivery unit cover is open when the copier is at

rest in the absence of copy paper.

copy paper.

absence of copy paper.

glass. The reversal inlet sensor (SR4) and the reversal registration sensor (SR5) are used.

side fails. Or, the end of the task is not detected after a specific time.

picked up while the delivery clock sensor (SR7) is used to check a delivery original, not enabling detection of the encoder pulses from the reversal delivery motor (M3).

If originals of different sizes are sent without selecting mixed size mode, the original size error alarm (0014) will be turned on. This jam indication is turned on to draw attention to the need of removing the jam. 008C (jam) and 0014 (alarm) are indicated at the same time, and the machine will reset itself automatically in 5 sec after the removal of the jam.

User cover open 0092 SR2,SR8 The cover is opened while ADF is in operation.

Separation sensor initial condition

Pre-registration sensor initial condition

Reversal inlet sensor initial condition

Reversal registration sensor

0094 SR3 The separation sensor (SR3) is on before the first original is

separated.

0095 U502 The pre-registration sensor (U502) is on before the first original

is separated.

0096 SR4 The reversal inlet sensor (SR4) is on before the first original is

separated.

0097 SR5 The reversal registration sensor (SR5) is on before the first

original is separated.

Table 2-207-2

2-46

CHAPTER 2 BASIC OPERATION

H. Alarm Detection

The machine's alarm code is as follows, and may be checked by making the following selection:

COPIER>DISPLAY>ALARM-1>DF

Alarm Display Screen (copier's service mode)

Display

< ALARM-1 >

DF 00 SORTER 00 00 00 00

I/O

Adjust

Function

< 1/1 > < READY >

Figure 2-280-1

Option Test

Counter

2-47

CHAPTER 2 BASIC OPERATION

The sensors and conditions used to identify alarms are as follows:

Jam Code Sensor Condition

Separation fault 0003 SR3 When picking up the 1st sheet, the separation sensor (SR3)

Jam recovery count error

Original extraction 0013 The original has been pulled off the tray while originals are

Original size error 0014 Originals of different sizes are used without selecting mix size

Operation mode error

0011 The jam recovery count is higher than the number of originals.

0021

does not turn on 500 msec after the separation motor (M1) has been rotated clockwise.

processed.

mode. Or, originals different in size by ±10 mm or more in

feeding direction have been detected. The selected combination of operating modes cannot be executed. 008C (jam) will also be indicated at the same time.

After the removal of the jam, the alarm (0014) will be indicated for 5 sec; thereafter, the alarm will automatically be reset.

Figure 2-207-3

2-48

CHAPTER 2 BASIC OPERATION

Reference:

At time of a jam, the copier remembers how may originals it has copied, and sends the information to the ADF controller upon removal of the jam. In response, the ADF controller circulates the originals that have been copied already, and places the originals that have not been copied on the copyboard for copying. For this reason, normal copying operation would not be possible if the number of originals after removal of jams differs from the number of originals before the jam. In the case of [1] in the following diagram, the ADF and the copier will stop to operate, treating the condition as a “different numbers of originals.” Keep in mind, however that, in the case of [2], normal operation will continue.

10 originals are placed on the original tray.

The 8th original jams.

(7 originals have been copied)

Error [2]

The 3rd original jams.

(2 originals have been copied.)

Normal

The originals are put back into order, and placed on the original tray (10 originals).

Error [1]

3 originals are set on the original tray.

10 (originals) - 7 (originals that have been copied) = 3 originals

8 originals are placed on the original tray.

10 (originals) - 2 (originals that have been copied) = 8 originals

Figure 2-280

The first 7 originals (which have been copied) are counted, and copying starts with the 8th original.

The number of operations are counted, and the ADF is stopped.

The originals are counted, and then copying starts with the 2nd original.

1. Resetting

To reset in response to wrong placement of originals, remove all originals from the original tray,

and place them back again. The copier will indicate a message; follow the instructions.

2-49

CHAPTER 2 BASIC OPERATION

I. Power Supply

The following figure shows an outline of the power supply system.

The ADF is supplied with two channels of 24 V power by the copier. One line (J2) runs through a circuit breaker (CB1) to reach various loads; the circuit breaker is designed to turn on in response to an overcurrent threatening the ADF’s circuitry. The other line (J1F) caries power which is converted into 5 V by a regulator (Q17) and is used by logic and sensor systems; a fuse resistor (FU1, FU2) is provided to cut off the power in response to an overcurrent in the circuit, thereby protecting the circuit.

Fuse resistor

24V

J2

Circuit breaker (CB1)

Fuse resistor (FU1)

24V

J1

Copier ADF controller PCB

Regulator IC (Q17)

(FU2)

5V

Figure 2-281

Logic

24V

5V

Break

Motor

Sensor

2-50

CHAPTER 3

MECHANICAL SYSTEM

I. BASIC CONSTRUCTION ...............3-1

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

B. Removing the Feed Belt Unit...3-4

C. ADF Controller PCB ..............3-5

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

A. Removing the Pickup Unit .....3-6

B. Removing the Separation

Motor (M1) ..............................3-6

Removing the Feed Motor (M2)

C.

D. Reversal Delivery Unit ...........3-8

E. Removing the Reversal Delivery

Motor (M3) ..............................3-9

III. FEEDING SYSTEM .................. 3-10

A. Removing the Separation Pad

Assembly .............................3-10

B. Removing the Separation

Roller ....................................3-11

C. Removing the Pickup Roller . .3-12

....3-7

D. Mounting the Separation

Roller Unit ............................ 3-13

E. Removing the Reversing Roller

and Feed Roller ................... 3-14

F. Replacing the Feed Belt ......3-16

VI. SENSORS ..................................3-18

A. Removing the Original Set Sen-

sor PCB (U503)....................3-18

B. Removing the Original Set Indi-

cator LED PCB.....................3-18

C. Removing the Last Original

Sensor PCB (U504) .............3-19

D . Original Width Detecting Volume

(VR)......................................3-19

E. Removing the Pre-Registration

Sensor (U502)......................3-21

F. Removing the Reversal Outlet

Sensor (U505)......................3-21

CHAPTER 3 MECHANICAL SYSTEM

[1]

[2]

[5]

[4]

[3]

I. BASIC CONSTRUCTION

A. External Covers

[1]

[1] Original tray [2] Auxiliary tray [3] Reversal delivery unit cover

[2]

[3]

Remove the appropriate covers as follows when cleaning, inspecting, or repairing the inside of the machine.

1. Removing the Original Tray

1) Mark the position of the original tray in

advance (by referring to the graduations

under the fixing screw).

Figure 3-101

[6]

[1]

[2]

[1] Front cover [2] Rear cover 1 [3] Rear cover 2 [4] ADF controller cover [5] Timing belt cover [6] Feed belt [7] Pickup unit cover

[4]

[7]

[3]

[5]

Figure 3-103

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

shift the original tray [2] to the front.

3) Remove the screw [4], and disconnect the

connector [5]; then, detach the grounding

wire [3].

4) Detach the original tray.

Figure 3-102

Figure 3-104

3-1

CHAPTER 3 MECHANICAL SYSTEM

[6]

Figure 3-105

Caution:

When mounting the original tray, try fitting the original retainer [6] into the pickup side.

2. Removing the ADF

1) Turn off the copier.

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

3) Open the ADF fully.

4) Remove the two screws.

[1]

Figure 3-107

5) Shift the ADF to the rear, and lift the ADF by holding it with both your hands.

Figure 3-106

Caution:

The foot of the hinge is equipped with a locking mechanism, requiring you to open the ADF fully when detaching it from the copier.

3-2

3. Removing the Cover

[1]

[3]

[5]

[8]

[7]

[9]

[4]

[6]

[2]

Be sure to detach the ADF from the copier before removing the pickup unit and the reversal delivery unit.

1) Remove the three mounting screws [2] and

the TP screw [3]; then, detach the front

cover.

2) Remove the three mounting screws [5],

and detach the rear cover 1 [4].

3) Remove the three mounting screws [7],

and detach the rear cover 2 [6].

4) Remove the two mounting screws 8, and

detach the ADF controller cover [9].

[7]

[8]

[3]

[6]

[9]

[5]

CHAPTER 3 MECHANICAL SYSTEM

■■

■ When Removing the Feed Belt

■■

Unit

1) Remove the three mounting screws [2] and the TP screw [3]; then, detach the front cover [1].

2) Remove the three mounting screws [5], and detach the rear cover 1 [4].

3) Remove the three mounting screws [7], and detach the rear cover 2 [6].

4) Remove the two mounting screws [8], and detach the ADF controller cover [9].

[1]

[4]

[2]

Figure 3-108

Figure 3-108-1

3-3

CHAPTER 3 MECHANICAL SYSTEM

B. Removing the Feed Belt Unit

■■

■ When Removing the Pickup Unit and

■■

the Reversal Delivery Unit

1) Remove the mounting screw [2], and detach the timing belt cover.

[2]

■■

■ When Removing the Feed Belt Unit

■■

1) Remove the mounting screw [2], and detach the timing belt cover.

[1]

Figure 3-109

2) Remove the four stop clips [4], and detach the feed belt unit.

[4]

[3]

[1]

[2]

Figure 3-110-1

2) Remove the four stop screws [4], and detach the feed belt unit [3].

[4]

[5]

Figure 3-110

Caution:

When mounting the feed belt unit, try lifting the pickup middle guide [5] slightly.

3-4

[3]

Figure 3-110-2

CHAPTER 3 MECHANICAL SYSTEM

[3]

[4]

C. ADF Controller PCB

1. Removing the ADF Controller PCB

Caution:

If you must remove the ADF controller PCB as part of removing the pickup unit or the reversal delivery unit, be sure to remove the ADF from the copier first.

1) Remove the two mounting screws [2], and detach the ADF controller cover [1].

3) Remove the two screws [4], and detach the ADF controller PCB [3].

Figure 3-112

[1]

[2]

Figure 3-111

2) Disconnect all connectors from the ADF controller PCB [3].

Caution:

Do not touch the connectors of the ADF controller PCB unless necessary.

2. Mounting the ADF Controller PCB

When mounting the ADF controller cover, take care so that the harness shown in the figure will not be trapped by the cover.

Figure 3-113

3-5

CHAPTER 3 MECHANICAL SYSTEM

II. DRIVE SYSTEM

A. Removing the Pickup Unit

Be sure to remove the ADF from the copier before removing any parts of the drive system.

1) Remove the original tray. (See A.

“External Covers” under I. “Basic

Construction.”)

2) Remove the body covers. (See A.

“External Covers” under I. “Basic

Construction.”)

3) Remove the feed belt unit. (See B.

“Removing the Feed Roller Unit” under I.

“Basic Construction.”)

4) Remove the ADF controller PCB. (See C.

“Removing the ADF Controller PCB”

under I. “Basic Construction.”)

5) Remove the seven mounting screws [2],

and detach the pickup unit [1].

To do so, lift the pickup unit cover side at

an angle, and put your hand underneath to

pull out the cable from the groove while

detaching it.

B. Removing the Separation

Motor(M1)

1) Remove the three mounting screws [2].

2) Disconnect the connector connected to the harness guide [1].

3) Shift the harness guide [1] upward.

[2]

[1]

(M1)

Figure 3-202

[2]

[1]

4) Detach the timing belt from the separation motor [3].

5) Remove the two screws [4], and detach the separation motor [3].

[3]

[4]

Figure 3-201

Figure 3-203

3-6

CHAPTER 3 MECHANICAL SYSTEM

C. Removing the Feed Motor (M2)

1) Remove the harness guide. (See Figure 3-

202.)

2) Remove the three mounting screws [2], and detach the motor unit [1] of the pickup assembly.

[2]

[1]

Figure 3-204

4) Remove the encoder plate [5] of the feed motor while opening the claw used to keep it in place.

[5]

Figure 3-206

5) Detach the timing belt [9] of the feed motor, and detach the relay gear [6].

6) Remove the four mounting screws [8], and detach the feed motor [7].

3) Remove the mounting screw [4], and detach the feed motor clock sensor [3].

[3]

[4]

Figure 3-205

[7]

[8]

[9]

[6]

Figure 3-207

3-7

CHAPTER 3 MECHANICAL SYSTEM

Caution:

The feed motor has its own orientation. When mounting it, check to make sure that it is oriented with the harness as shown.

Figure 3-207-1

D. Reversal Delivery Unit

1. Removing the Reversal Delivery Unit

1) Remove the screw [2] used to keep the support shaft of the delivery cover [1] in place, and push the support shaft to detach the delivery cover while pulling it to the front.

[1]

[2]

Figure 3-208

2) Remove the ADF controller PCB.

3) Fit the connector on the reversal delivery unit side into the groove.

4) Remove the five mounting screws [4], and detach the reversal delivery unit [3].

[4]

[3]

3-8

Figure 3-209

CHAPTER 3 MECHANICAL SYSTEM

2. Mounting the Reversal Delivery Unit

When mounting the reversal delivery unit to the feeder, take care so that the unit will not interfere with the plastic film shown in the figure.

If deformed, the plastic film [1] can cause jams in the reversal delivery assembly.

[4]

[3]

[1]

E. Removing the Reversal

Delivery Motor (M3)

1) Remove the reversal delivery unit.

2) Remove the two mounting screws of the harness guide [1].

3) Disconnect the connectors connected to the reversal delivery motor and the reversal delivery motor clock sensor.

4) Remove the two mounting screws [4], and detach the reversal delivery motor [3].

[2]

[3]

[4]

Figure 3-209-1

[2]

Figure 3-210

3-9

CHAPTER 3 MECHANICAL SYSTEM

III. FEEDING SYSTEM

A. Removing the Separation

Pad Assembly

1) Set bits 3, 5, and 6 of the DIP switch on the ADF controller PCB to ON (lifter ascent mode).

O

F

1

2

3

4

5

6

7

8

Figure 3-301

2) Press the push switch. (In about 3 sec, the lifter will move up and stop automatically.)

3) Close the feeder.

4) Remove the two mounting screws [2], and detach the separation roller cover [1].

ON

5) Check to make sure that the separation roller holder is as shown.

Figure 3-301-2

6) Release the guide roll [3] in upward direction with a flat-blade screwdriver or tweezers, and remove it.

[3]

[2]

[1]

Figure 3-301-1

Figure 3-302

7) Remove the two screws [5], and detach the separation pad assembly [4].

[4]

[5]

Figure 3-302-1

3-10

CHAPTER 3 MECHANICAL SYSTEM

8) Remove the separation pad [6].

[6]

Figure 3-302-2

9) After mounting the separation pad, be sure to shift bits 3 and 6 of the DIP switch to ON, and press the push switch (lifter descent mode; in about 3 sec, the lifter will move down and stop automatically).

B. Removing the Separation

Roller

1) Remove the separation pad assembly.

2) Move down the separation roller holder [1], and pull off the stopper [2] as shown.

[1]

[2]

Figure 3-303

3) Move the separation roller coupling [3] and the separation bushing [4] to the left with tweezers.

[3]

[4]

Figure 3-303-1

3-11

CHAPTER 3 MECHANICAL SYSTEM

4) Move down the separation roller holder in the direction of the arrow [A], and pull the separation roller unit to the front.

[7]

[A]

Figure 3-304

C. Removing the Pickup Roller

1) Remove the separation unit. (See A. “Removing the Pickup Roller.”)

2) Remove the E-ring [1] used to keep the shaft in place. Then, pull off the shaft [2], and detach the pickup roller [3].

[3]

[2]

5) Remove the E-ring [5] used to keep the shaft in place, and pull off the shaft pin [6]. Then, pull off the shaft [7], and detach the separation roller [8].

[8]

[6]

[5]

[7]

[1]

Figure 3-306

3-12

Figure 3-305

CHAPTER 3 MECHANICAL SYSTEM

D. Mounting the Separation

Roller Unit

1) While paying attention to the position of the bushing, fit the separation roller unit into the pickup unit.

[3]

Figure 3-307

4) Pick the tip of the coupling [3] with tweezers, slide it to the right, and engage it with the separation roller shaft.

5) While holding the tip of the coupling to the right with tweezers, rotate the separation roller [4] in the direction shown in the figure to engage the spring pin and the coupling.

Figure 3-308

2) Check to make sure that the separation roller holder lever is under the joint shown in the figure.

Figure 3-307-1

3) Move the bushing [2] to the right.

6) Move the separation roller holder [5] in the direction of [A] in the figure.

7) Fit in the stopper [7].

[5]

[A]

[6]

Figure 3-309

Caution:

Be sure to mount the stopper from above the separation roller holder lever.

3-13

CHAPTER 3 MECHANICAL SYSTEM

8) Move the stopper up and down slightly to make sure that the stopper is in the groove of the separation roller coupling.

Figure 3-309-1

9) After mounting the separation pad or the separation roller, be sure to shift bits 3 and 6 of the DIP switch to ON, and press the push switch (lifter descent mode; in about 3 sec, the lifter will move down and stop automatically).

E. Removing the Reversing

Roller and Feed Roller

1) Remove the reversal delivery unit. (See E. “Removing the Reversal Delivery Unit” under II. “Drive System.”)

2) Remove the reversal delivery motor. (See E. “Removing the Reversal Delivery Motor” under II. “Drive System.”)

3) Remove the E-rings [1] and [2] used to keep the two gears in place; then, remove the E-ring [3] used to keep the main shaft in place. Pull off the shaft pin [4] from the main shaft, and detach the two gears [5] and [6].

[6]

[2]

[3]

[5]

Figure 3-310

[4]

[1]

3-14

CHAPTER 3 MECHANICAL SYSTEM

4) Remove the grip ring [7] used to keep the gear in place. Remove the gear [9], and remove the E-ring [8] used to keep the shaft in place.

[8]

[9]

Figure 3-311

7) Remove the three mounting screws [14], and detach the gear cover [13].

[7]

[13] [14]

Figure 3-313

8) Pull off the shaft pin from the shaft of the reversing roller, and detach the reversing roller [16].

5) Remove the spring [10] of the middle guide.

6) While lifting the middle guide unit [11], shift the reversing roller [12] together with its shaft in the direction of the arrow to detach.

[11]

[10]

[12]

[15]

[16]

Figure 3-314

Figure 3-312

3-15

CHAPTER 3 MECHANICAL SYSTEM

9) Remove the E-rings [17] and [18] used to keep the shaft of the feeding roller in place.

10) Remove the bushings [19] and [20] from both ends, and detach the feeding roller [21].

[19]

[17]

[21]

[18] [20]

Figure 3-315

F. Replacing the Feed Belt

1) Remove the feed belt unit. (See B. “Removing the Feed Belt Unit” under I. “Basic Construction.”)

2) Remove the two springs [1] from both ends of the feed belt unit.

[1]

Figure 3-316

3) Pull out the feed belt [2].

Figure 3-317

[2]

3-16

Caution:

The retaining rolls of the feed belt unit exert different degrees of spring pressure, with the one with a gold-colored spring exerting greater pressure than the one with a silver-colored spring. Check to make sure that the correct roll is used for each location; there are three types of springs: [3] : gold-colored spring (2 pc.) [4] : silver-colored spring (4 cp.) [3] : other than [4]; silver-colored spring

(8 pc.)

[4]

CHAPTER 3 MECHANICAL SYSTEM

Figure 3-318

[3]

3-17

CHAPTER 3 MECHANICAL SYSTEM

VI. SENSORS

A. Removing the Original Set

Sensor PCB (U503)

1) Remove the pickup unit. (See A. “Removing the Pickup Unit.” under II. “Drive System.”)

2) Shift the harness guide. (See Figure 3-

302.)

3) Remove the mounting screw [2], and detach the mounting stay [1] of the original set sensor PCB.

4) Disconnect the connector [5].

5) Remove the two mounting screws [4], and detach the original set sensor PCB [3].

[2]

B. Removing the Original Set

Indicator LED PCB

1) Remove the pickup unit. (See A. “Removing the Pickup Unit” under II. “Drive System.”)

2) Disconnect the connector [3].

3) Remove the mounting screw [2], and detach the original set indicator LED PCB [1].

[2]

[3]

[1]

[3]

[4]

Figure 3-401

[5]

[1]

Figure 3-402

3-18

CHAPTER 3 MECHANICAL SYSTEM

C. Removing the Last Original

Sensor PCB (U504)

1) Remove the original tray. (See 1. “Removing the Original Tray” under I. “Basic Construction.”)

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

[2]

[1]

D. Original Width Detecting

Volume (VR)

1. Removing the Original Width Detecting Volume

1) Remove the original tray. (See 1.

“Removing the Original Tray” under I. “Basic Construction.”)

2) Remove the cover of the original tray. (See

C. “Removing the Last Original Sensor PCB (U504).”

3) Disconnect the connector [3].

4) Remove the screw [5], and remove the

grounding wire [4].

5) Remove the two mounting screws [2], and

detach the original width detecting volume PCB [1].

[2]

Figure 3-403

3) Disconnect the connector [5].

4) Remove the two mounting screws [4], and detach the last original sensor PCB [3].

[4]

[3]

[5]

[4]

[1]

[3]

Figure 3-405

figure 3-404

3-19

CHAPTER 3 MECHANICAL SYSTEM

2. Mounting the Original Width Detecting Volume

1) Remove the width guide roll.

2) Move the side guides to both ends.

[2]

[1]

Figure 3-406

[2]

5) Turn the volume fully in the direction of the arrow [A], and turn it back an equivalent of two teeth [B].

[A]

[B]

[5]

Figure 3-408

6) Mount the original width detecting volume with two screws.

7) Mount the grounding wire, and connect the connector.

[10]

3) Mount the volume idler gear against the arrow marking.

4) Check to make sure that the click claw of the side guide gear is as shown.

[4]

[3]

Figure 3-407

[8]

[6]

[9]

[7]

Figure 3-409

8) Mount the covers and the width guide roll; then, mount the original pickup tray to the feeder.

9) Perform original tray width adjustment discussed in B. “Electrical System” under I. “Standard and Adjustments” in Chapter 5.

3-20

CHAPTER 3 MECHANICAL SYSTEM

[3]

[2]

[1]

[4]

E. Removing the Pre-Registration

Sensor (U502)

1) Remove the pickup unit. (See A. “Removing the Pickup Unit” under II. “Drive System.”)

2) Remove the two mounting screws [2], and detach the pickup lower cover [1].

[1]

Figure 3-410

[2]

F. Removing the Reversal

Outlet Sensor (U505)

1) Remove the reversal delivery unit. (See E. “Removing the Reversal Delivery Unit” under II. “Drive System.”)

2) While pushing down the reversal inside guide [1] with your finger, remove the mounting screw [3].

3) Slide the reversal outlet sensor PCB [2] halfway up; then, disconnect the connector [4].

3) Open the pickup unit cover; then, remove the two mounting screws [2], and detach the pre-registration sensor PCB mounting stay [1].

4) Disconnect the connector [5]; then, remove the two mounting screws [4], and detach the pre-registration sensor PCB [3].

[3]

[4]

[1]

[5]

Figure 3-412

[2]

Figure 3-411

3-21

CHAPTER 4

MAINTENANCE AND SERVICING

I. PERIODICALLY REPLACED

PARTS ........................................ 4-1

CONSUMABLES AND

II.

DURABLES..................................

4-1

III. SCHEDULED SERVICING

CHART........................................4-2

CHAPTER 4 MAINTENANCE AND SERVICING

I. PERIODICALLY REPLACED PARTS

The ADF does not have parts that must be replaced on a periodical basis.

II. CONSUMABLES AND DURABLES

Some parts of the ADF need replacement once or more over the period of product guarantee

because of deterioration or damage. Replace them when they prove to be faulty.

As of March. 1999

No.

1 2 3 4

Parts Feed belt Separation roller Separation pad Pickup roller

Parts No. FB4-6934 FB5-0466 FF5-9160 FB4-1151

Q’ty

1 1 1 1

Life (copier) Remarks

120,000 180,000

60,000

120,000

Replace it dirt cannot be removed.

Based on the actual number of sheets dealt with.

Tale 4-201

Note:

The above values do not indicate the copier’s counter readings, but the actual numbers of sheets that have been deal with. Further, they are estimates only and are subject to change based on future data. Be sure to check this reading (actual number) in the copier's service mode: COPIER>COUNTER>FEEDER-FEED. (For details, see B-4 "COUNTER" in Chapter 5.)

4-1

CHAPTER 4 MAINTENANCE AND SERVICING

III. SCHEDULED SERVICING CHART

Caution:

Do not use solvents or oils not shown herein.

:Clean :Replace :Lubricate :Adjust :Inspect

Scheduled servicing

No.

1 2 3 4 5 6 7 8

Last original sensor (U504) Pre-registration sensor (U502) Pickup roller Registration roller Feed roller Reversal delivery roller Retaining roll Drive roller

Parts

every 60,000

or 6 mon

every 60,000

or 1 yr

every 120,000

copies

Remarks

Remove the sensor, and dry wipe it.

Clean with alcohol when replacing the feed belt (120,000 copies).

[4]

[2]

[3]

[8]

Table 4-301

[1]

Figure 4-301

[5]

[6]

[7]

4-2

CHAPTER 5

TROUBLESHOOTING

I. STANDARDS AND ADJUST-

MENTS........................................5-1

A. Mechanical System................5-1

B. Electrical System ................... 5-4

II. TROUBLESHOOTING................5-9

A. Troubleshooting

Malfunctions......................... 5-10

III. ARRANGEMENT OF THE ELEC-

TRICAL PARTS ........................ 5-12

A. Motors, Solenoids, and

Sensors................................5-12

B. PCBs....................................5-14

IV. VARIABLE RESISTORS (VR),

LIGHT-EMITTING DIODES, AND

CHECK PINS BY PCB ............. 5-15

A. ADF Controller PCB ............ 5-15

B. Sensor PCBs ....................... 5-16

C. Indicator PCB.......................5-18

V. SERVICE MODE AND DIP

SWITCH.................................... 5-19

A. Outline..................................5-19

B. Service Mode .......................5-20

C. Using the DIP Switch ...........5-28

VI. SELF DIAGNOSIS .................... 5-32

A. ADF Self Diagnosis ............. 5-32

CHAPTER 5 TROUBLESHOOTING

< 1/1 > < READY >

DOCST DOCST-RP

Display

Adjust

Function

Option Test

Counter

I/O

150mm

L2

Horizontal size plate

Copy paper

L1 may be anywhere as long as it is on the copy paper.

*

I. STANDARDS AND

ADJUSTMENTS

A. Mechanical System

The major adjustments of the ADF are made using its host copier's service mode. For all adjustments using the DIP switch on the ADF controller PCB, see V.C. "DIP Switch Functions."

1 Selecting Service Mode

1) Press the User Mode key '

control panel.

2) Press '2' and '8' on the keypad at the same

time.

3) Press the User Mode key '

· The display will show the following screen.

COPIER FEEDER

SORTER

COPIER copier service mode

FEEDER ADF service mode

SORTER finisher service mode

FAX fax service mode

' on the

' once again.

2 Correcting the Original Skew

1) Set the copier to service mode.

2) Select FEEDER>ADJUST>DOCST (for functions).

Figure 5-101-1

3) Place one original (A3 or 11x17) on the original tray, and press 'OK'. The original will be moved to and stopped on the copyboard glass.

4) Open the ADF, and check the position of the original on the copyboard glass. Check to make sure that the difference between L1 and L2 in the figure is 1 mm or less.

FAX

Figure 5-101

Figure 5-102

5-1

CHAPTER 5 TROUBLESHOOTING

5) If the difference is not as indicated, loosen the nut found at the rear of the right hinge unit.

Right hinge unit

Figure 5-103

Adjusting screw

6) Make adjustments by turning the adjusting screw (hex) so that 1 to 2 is as indicated.

Adjusting screw

Right hinge unit

Hex driver

Figure 5-104

Relationship between and 2 and the Adjusting Screw

Direction of rotation Relationship between

and Clockwise direction Counterclockwise

direction

1

< 2*

1

<

1

2

Right hinge unit

Figure 5-103-1

Nut

Hex driver

Range: ±2.0 mm (The adjusting screw may be given a maximum of 2 turns.) The feeder will not move; after turning the adjusting screw, be sure to move the feeder by hand.

Table 5-101

7) After adjustment, tighten the nut to secure the adjusting screw in place.

5-2

CHAPTER 5 TROUBLESHOOTING

3 Adjusting the Position of the

Reversal Delivery Flapper

If a double-sided original tends to jam or fold into a Z in the duplexing feeding assembly, adjust the position of the reversal delivery flapper as follows:

1) Remove the four mounting screws, and

detach the front cover. (See A. "External

Covers" under I. "Basic Construction.")

2) Open the reversal delivery unit cover [1],

and loosen the screw [2] shown in the

figure.

[1]

[2]

4) If

is not as indicated, turn the adjusting screw [5] to adjust the position of the reversal delivery flapper. If it is too narrow, turn the adjusting screw clockwise; if too wide, on the other hand, turn it counterclockwise. Standards:

= 0.8 to 1.3 mm

(THICKNESS GAUGE) If is not as indicated, the following symptoms tend to occur; be sure to make adjustments so that it is as indicated:

· If it is less than 0.8, double-sided originals will tend to move askew.

· If it is more than 1.3, originals with a bent leading edge (downward) tend to get hooked on the reversal inlet assembly.

5) Tighten the screw [2] of the reversal delivery unit, and close the reversal delivery unit cover [1].

6) Mount the front cover.

Figure 5-105

3) Open the ADF slowly, and turn the reversal delivery roller [3] counterclockwise in the direction of [A] (working from where the reversal delivery unit cover was) so that the reversal delivery flapper [4] is as shown .

[1]

[3]

[A]

[4]

[5]

0.8 to 1.3mm

Figure 5-106-1

Figure 5-106

5-3

CHAPTER 5 TROUBLESHOOTING

B. Electrical System

1 When Replacing the Major Parts

Major parts Work

ADF controller PCB 1. EEPROM initialization

2. Original tray width adjustment (A/B-configuration, inch-configuration)

3. Sensor level adjustment

4. Registration position adjustment

5. Duplexing registration adjustment

Last original sensor (U504) 1. Sensor level adjustment Original set sensor (U503) Pre-registration sensor (U502) Reversal outlet sensor (U505)

Original width detecting volume (U508) 1. Original pickup tray width adjustment

Table 5-103

2 EEPROM Initialization

1) Remove the ADF controller cover, and shift bits 4, 5, and 6 of the DIP switch (DSW1) on the ADF controller PCB to ON.

2) Open the pickup unit cover.

O

F

1

2

3

4

5

6

7

8

ON

3) While holding down the push switch, turn off and then on the copier. This will initialize the backup data of the EEPROM.

4) Check to make sure that LED2 is on.

5) Close the pickup unit cover, and shift all bits of the DIP switch (DSW1) to OFF.

6) Turn off the copier; then, turn it on once again.

Caution:

If you have replaced the ADF controller PCB once again, be user to initialize the EEPROM first.

5-4

Figure 5-107

Canon GP405, Gp-335 Service Manual DADF-B1

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

CHAPTER 1

I. FEATURES

II. SPECIFICATIONS

III. NAMES OF PARTS

IV. OPERATIONS

CHAPTER 2

I. BASIC CONSTRUCTION

II. BASIC OPERATIONS

CHAPTER 3

I. BASIC CONSTRUCTION

II. DRIVE SYSTEM

III. FEEDING SYSTEM

VI. SENSORS

CHAPTER 4

I. PERIODICALLY REPLACED PARTS

II. CONSUMABLES AND DURABLES

III. SCHEDULED SERVICING CHART

CHAPTER 5