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

Canon GP405, Gp-335 Service Manual DADF-B1

CONTENTS

CHAPTER 1

I. FEATURES

II. SPECIFICATIONS

III. NAMES OF PARTS

IV. OPERATIONS

CHAPTER 2

I. BASIC CONSTRUCTION

II. BASIC OPERATIONS