Canon NP6320 Service Manual

REVISION 0

DEC. 1999

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FY8-13GF-000

IMPORTANT

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

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

OFFICE IMAGING PRODUCTS QUALITY ASSURANCE CENTER

CANON INC.

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

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INTRODUCTION

This Service Manual contains basic data and figures for the NP6320 needed to

service the machine in the field. Chapter 1 Chapter 2 Chapter 3

Chapter 4

Chapter 5

Chapter 6

Chapter 7

Chapter 8 Chapter 9 Chapter 10

General Description

shows how to operate the copier, and explains how copies are made.

Basic Operation

workings.

Exposure System

lens drive unit and scanner drive unit. It also explains the timing at which these drive units are operated, and shows how they may be disassembled/ assembled and adjusted.

Image Formation System

It also explains the timing at which the various units involved in image formation are operated, and shows how they may be disassembled/ assembled and adjusted.

Pick-Up/Feeding System

is picked up to when a copy is delivered in view of the functions of electrical and mechanical units ahd in relation to their timing of operation. It also shows how these units may be disassembled/assembled and adjusted.

Fixing System

media in view of the functions of electrical and mechanical units and in relation to their timing of operation. It also shows how these units may be disassembled/assembled and adjusted.

explains the principles used to fuse toner images to tranfer

Externals/Auxiliary Mechanisms

explains the principles used for the copier’s various control mechanisms in view of the functions of electrical and mechanical units and in relation to their timing of operation. It also shows how these units may be disassembled/ assembled and adjusted.

Installation

how the copier may be installed using step-by-step instructions.

introduces requirements for the site of installation, and shows

Maintenance and Servicing

consumables/durables and scheduled servicing charts.

Troubleshooting

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

introduces the copier's features and specifications,

provides outlines of the copier's various operational

discusses the principles of operation used for the copier's

discusses the principles of how images are formed.

explains the principles used from when copy paper

shows the copier's external parts, and

provides tables of periodically replaced parts and

provides tables of maintenance/inspection, standards/

Appendix contains diagrams showing electrical parts arrangement, tables of signals, tables of special tools, tables of solvents/oils, and a general timing chart.

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 from 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.

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i

System Configuration

The NP6320 is designed to accommodate the following for fully automated copy work:

ADF-A1 A stack of documents may be placed for automatic pick-up and feed.

Control Card V With the card, the volume of copy work may be put under control.

ADF-D1 The fastest and easiest way to copy.

Sorter-A1 Up to 20 copies may be automatically sorted or grouped by page.

Place originals in this feeder and they are automatically fed to the platen glass.

ii

MS-A1 Up to 10 sets of copies may be automatically sorted or grouped by page.

Paper Deck Pedestal-J1 Accommodates as many as 1000 sheets of copy paper.

Stapler Sorter-D3 Up to 10 sets of copies may be automatically sorted. Further, copies may be automatically sorted and then stapled in sequence.

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CHAPTER 1

GENERAL DESCRIPTION

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

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

A. Ty pe .......................................1-2

B. Constr uction.......................... 1-2

C. Performance.......................... 1-3

D. Others.................................... 1-3

III. NAMES OF PARTS......................1-5

A. External View ........................1-5

B. Cross Section........................1-6

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IV. OPERATION ................................ 1-7

A. Control Panel .........................1-7

B. Setting the Auto Shut-Off

Time ......................................1-9

C. Daily Inspection to Be

Perfor med by the User ..........1-9

V. IMAGE FORMATION

PROCESS ................................. 1-11

A. Outline................................ 1-11

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CHAPTER 1 GENERAL DESCRIPTION

I. FEATURES

1. Front-loading.

• The copier is designed to accept cassettes from the front for ease of use (two cassettes holding 250 sheets each).

• The copier is given two cassette holders, thereby eliminating the need for cassette replacement in making copies of different sizes.

• The copier’s multifeeder allows feeding multiple postcards.

2. Full line of automatic features.

• The copier has an auto paper selection mechanism as standard, which selects paper of the correct size in response to placement of a document.

• With the auto reproduction ratio selection mechanism, the copier calculates the correct reproduction ratio according to the specified copy size.

• The AE (auto exposure) mechanism ensures crisp reproduction of newspapers and blue-print documents.

• The copier’s auto-start feature lets you press the COPY START key during the wait period so that the copier will start making copies as soon as it becomes ready.

3. HQ jumping toner.

• The copier uses Canon’s own HQ (high quality) jumping toner for reproduction of clear characters and photos.

• The toner is a single-component type, which provides stable images.

• In addition, a 30mm-dia. high sensitivity OPC drum is used to enable enhanced image reproduction and a compact copier design.

4. Man-machine interface.

• As many as 20 copies (A4, landscape) may be made per minute.

• The zoom mechanism allows reduction down to 50% and enlargement up to 200% of the original image.

• The page separation mode serves to speed up copying bound documents.

• The copier accepts documents as small as a postcard or as large as A3.

5. A variety of options to choose from for full automation.

The copier communicates with its options at a higher speed than ever, resulting in more output per given time*.

*With options, up to 20 copies/min; 1:1 (A4, landscape).

• ADF-A1/ADF-D1 for automatic document feed.

• Sorter-A1 for automatic sorting and grouping (20 bins).

• MS-A1 for automatic sorting and grouping (10 bins).

• Control Card V (configured as built-in) for copy volume control (up to 200 groups).

• Stapler Sorter for stapling copies sorted in its ten bins.

• Paper Deck Pedestal-J1 for improved paper pick-up capacity.

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1-1

CHAPTER 1 GENERAL DESCRIPTION

II. SPECIFICATIONS

A. Type

Body Copyboard Light sourse Lens Photosensitive medium

B. Construction

Copying Charging Exposure Copy density adjustment Development Pick-up Automatic

Manual Transfer Separation Cleaning Fixing

Desktop Fixed Halogen lamp (330W) Zoom lens OPC

Indirect static photocopying Corona Slit (moving light source) Automatic (AE) or Manual Dry (toner projection) 2 cassettes Multifeeder (about 50 sheets of 80g/m2) Corona Curvature and Static eliminator Blade Heat roller (900 W)

1-2

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CHAPTER 1 GENERAL DESCRIPTION

C. Performance

Document type Sheet, Book, 3-D object (2 kg) Document size (max.) A3 (297×420 mm) Reproduction ratio See Table 1-1; 50% to 200%, zoom. Wait time 30 sec or less (20°C) First copy 8 sec or less (AE and non-AE) Continuous copying 1 to 99 copies Copy size A3 (297 × 431.8 mm) max.

Postcard (100 × 148 mm) min.

Copy paper Cassette Plain paper (64 to 80 g/m2), Tracing paper*, Colored paper*

Multifeed tray Plain paper (64 to 128 g/m2), Tracing paper*

Colored paper*, OHP film*, Postcard, Label* Two-sided copy Plain paper (64 to 128 g/m2), Colored paper*, Overlay copy Postcard

Cassette Claws, Front loading: 27 mm deep

(about 250 sheets of 80 g/m2)

Copy tray 99 sheets (80 g/m2) Non-image width 2.0 ±1.5 mm (leading edge),

2.5 ±1.5 mm (left/right) Auto clear mechanism Provided. (2 min, standard) Auto shut-off mechanism Provided. (30 min, standard; may be disabled and changed) Automatic energy saving mechanism Provided (15 min, standard; may be disabled) Auto start Provided. Option Sorter-A1, MS-A1, Paper Deck Pedestal-J1, Control Card V,

Stapler Sorter-D3, ADF-A1, ADF-D1

* Of a type recommended by Canon.

D. Others

Operating environment Temperature 7.5° to 32.5°C

Humidity 5% to 85% Atmospheric pressure

Power source Serial No.

220-240V/50 Hz QEPxxxxx (UK) 220-240V/50 Hz UEPxxxxx (AMS)

Power consumption Maximum 1.5 kW

During copying 0.840 kWH (reference only) At standby 0.158 kWH (reference only)

Noise During copying 66 dB or less (

At standby 40 dB or less (Sound power level) Ozone (average over 8 hrs.) 0.01 ppm or less (Blue Angel Standards) Dimensions Width 697 mm

Depth 617 mm

Height 541 mm Weight 58.7 kg (approx.) Consumables Copy paper Keep wrapped to protect against humidity.

Toner Avoid direct sun, and keep under 40°C, 85%.

0.6 to 1 atm.

Impulse sound power level

)(

As prescribed by

Blue Angel Standards)

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1-3

CHAPTER 1 GENERAL DESCRIPTION

Reproduction mode

DIRECT

REDUCE

I

II

ENLARGE

I

II

Paper size

A3 (297×420mm) A4 (210×297mm) A4R (297×210mm) B4 (257×365mm) B5 (182×257mm) A5R (210×149mm) 50% A3→ A4R A4R→ A3 200%

Cassette

A3

A4 A4R (B4) (B5) A5R

A4R

A3

Copies/min

11 20 15 12 21 20

13 11

1-4

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III. NAMES OF PARTS

A. External View

[1]

[8]

[2]

[7]

CHAPTER 1 GENERAL DESCRIPTION

[4]

[3]

[1] Copy tray [2] Copyboard cover [3] Control panel [4] Power switch [5] Upper cassette [6] Lower cassette [7] Front door

[6]

[5]

[8] Delivery cover

Figure 1-301

[1] [2]

[7] [6] [5] [4] [3]

Figure 1-302

[1] Copyboard glass [2] Multifeeder cover [3] Multifeeder tray [4] Developing assembly

release lever

[5] Feeder assembly release

lever [6] Drum unit [7] Fixing assembly knob

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1-5

CHAPTER 1 GENERAL DESCRIPTION

B. Cross Section

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

[10]

[11] [12] [13] [14]

[1] No. 3 mirror [2] No. 2 mirror [3] No. 1 mirror [4] Scanning lamp [5] Copyboard glass [6] Copyboard cover [7] Lens [8] Pre-exposure lamp [9] Primary corona unit [10] No. 6 mirror

[11] No. 5 mirror [12] No. 4 mirror [13] Registration roller [14] Multifeeder tray [15] Vertical feed roller 1 [16] Vertical feed roller 2 [17] Cassette 1 pick-up roller [18] Cassette 2 pick-up roller [19] Feeder roller [20] Transfer corona unit

Figure 1-303

[15][16][17] [18][19][20][21][22][23][24][25][26][27][28][29]

[21] Static charge eliminator [22] Photosensitive drum [23] Cassette 1 [24] Cassette 2 [25] Feeder unit [26] Ozone filter [27] Exhaust fan [28] Fixing unit [29] Delivery roller

1-6

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CHAPTER 1 GENERAL DESCRIPTION

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1-7

CHAPTER 1 GENERAL DESCRIPTION

IV. OPERATION

A. Control Panel

[1]

[10]

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

AUTO

A4

123

A3 A4

U

[11]

Max 200% A4 A3

1 : 1 A3 A4 Min 50%

1 : 1

[12] [13] [14] [15] [19] [20] [21][17][16] [18]

No. Name

[1] Sorter key

[2] Two-Page Separation key

[3] Paper Size indicators

[4] Control Card Check indicator

Toner Out indicator Add Paper indicator

Paper Jam indicator Paper Jam Location indicator

Paper Supply indicator

[5] Copy Quantity/Copy Ratio display

[6] Reset key

Autom. Zoom

%

Zoom

1C/2 3 4 5

6 7 8 9 0

Figure 1-401

Description

Press to turn the Sort, Group, and Staple-Sort modes on and off. * Effective when a Sorter or Stapler Sorter is attached.

• Sort indicator Lights when the Sort mode is on.

• Group indicator Lights when the Group mode is on.

• Staple-Sort indicator Lights when the Staple-Sort mode is on.

Turns the two-page separation mode on and off. Two-Page Separation indicator lights when the two-page separation mode is on. Lights to show the selected paper size. AUTO lights when the automatic paper select mode is on. Flashes when the control card is not firmly inserted. Flashes when black toner needs to be added. Flashes when there is no paper in the selected paper supply, a cassette is not fully inserted, or the optional paper deck is not fully closed. Flashes if there is a paper jam. Flashes where there is a paper jam. Lights where inspection is necessary. The selected paper supply lights: either a cassette, the stack bypass, or the optional paper deck. Displays the number of copies and the copy ratio. If the machine is not functioning properly, the Service Call indicator will be displayed here. Returns the copy mode to the standard mode.

Table 1-401

1-8

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CHAPTER 1 GENERAL DESCRIPTION

No. Name

[7] Clear/Stop key

[8] Energy Saver key

[9] Power switch [10] Copy Exposure lever [11] AE key

[12] Reduce key [13] Direct Copy key [14] Enlarge key [15] Paper Select key

[16] Auto Zoom key [17] Zoom keys

[18] Percent key [19] Start key

[20] Number keys [21] Power indicator

Description

Press to change the copy count or to stop the copier before copying is complete. Press to turn the standby mode on or off. Lights when the Energy Saver mode is on. Flashes orange when the copier has shut off automatically.

Use to manually adjust the copy exposure. Press to turn the automatic exposure mode on and off. When the mode is on, the copy exposure is adjusted automatically. AE Indicator Lights when the AE mode is on. Press to reduce the size of the copies by a fixed ratio. Press to make copies the same size as the original. Press to enlarge the size of the copies by a fixed ratio. Press to select the automatic paper select mode, a cassette, or the paper deck (option). Press to turn the automatic zoom mode on or off. Press to freely input the enlargement/reduction ratio within the 50-200% range, in 1% increments. Press to display the input enlargement/reduction ratio. Press to start making copies. Start indicator Flashes green when the machine is warming up. Lights green when the machine is ready to copy. Lights red during copying. Press to input the number of copies to be made.

-

Table 1-402

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1-9

CHAPTER 1 GENERAL DESCRIPTION

B. Setting the Auto Shut-Off time

If the copier is not used for 30 minutes, the power will turn OFF automatically. To turn the power back ON, press the Power Switch. The Auto Shut-Off mode time can be set from 10 minutes to 2 hours.

1 Press the AE key for 5 seconds or more. 2 The default time selection (“A-4”) is displayed on the control panel display. 3 Select the desired time setting with the ZOOM or Number key. 4 The selected timer setting (“A-1” thru “A-9”) is shown on the control panel display.

Display

Time [min]

A-1

10

A-2

15

A-3

20

A-4

30

A-5

40

A-6

50

A-7

60

A-8

90

A-9 120

Table 1-403

5 Press the SORT key to store the timer settings and exit this mode. 6 Press the RESET key to exit without storing the timer setting.

C. Daily Inspection to Be Performed by the User

Clean the following parts of the copier at least once per week or whenever copies are unclear.

• When cleaning the copier, first turn OFF the power switch and unplug the power plug. Failure to observe these items may result in fire or electrical shock.

• Clean the copier using a firmly wrung-out cloth dampened with a mild cleansing detergent. Do not use alcohol, benzene, paint thnner or other inflammable substances. If inflammable substances come into contact with a high-voltage area inside the copier, this may result in fire or electrical shock.

1. Copyboard Glass

Wipe the copyboard glass with a cloth dampened with water or a mild cleaning agent. Then

wipe with a dry cloth.

2. Copyboard Cover

Wipe the white surface on the underside of the copyboard cover with a cloth dampened with

water or a mild cleaning agent. Then wipe with a dry cloth.

1-10

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CHAPTER 1 GENERAL DESCRIPTION

3. Cleaning the Corona Assembly

1) Grip the handles on both sides of the front door, and open the front door.

3-1. Cleaning Using the Corona Assembly Cleaner

1) Grip the tab on the end of the corona assembly cleaner, and slide the corona assembly cleaner out toward you. Then, slide the corona assembly cleaner back into the copier. Repeat this motion several times. When you finish, slide the corona assembly cleaner back into the copier to its original position.

3-2. Cleaning the Static Eliminator

1) Turn the transport area release lever (green) to the left. Push slightly downward on the end of the static eliminator, and slide it out of the copier.

2) After removing the static eliminator, turn it so that the bottom is facing upward. Slide the gray tab on the bottom of the static eliminator back and forth from one end to the other several times.

3) When you finish, insert the static eliminator back into the copier, and return it to its original position.

4) Return the transport area release lever to its original position. Close the front door.

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1-11

CHAPTER 1 GENERAL DESCRIPTION

V. IMAGE FORMATION PROCESS

A. Outline

Copyboard glass

Scanning lamp

Lens

Cleaning roller

+

Lower fixing roller

+

Developing assembly

+

+ +

Primary corona assembly

Pre-exposure lamp

Drum cleaner

Upper fixing roller

+

Transfer corona assembly

Static charge eliminator

Cassette 1

Cassette 2

Figure 1-501

Electrostatic latent image formation block

+ +

+

++

1-12

8. Drum cleaning

Copy delivery

2. Primary corona

1. Pre-exposure

6. Separation

7. Fixing

3. Image exposure

4. Developing

5. Transfer

Cassette1 Cassette2

Flow of copy paper Direction of rotation of drum

Multifeeder

Registration

Figure 1-502

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CHAPTER 1 GENERAL DESCRIPTION

This copier consists of the units shown in Figure 1-502. The image forming process is divided into the right steps shown below. Step 1: Pre-exposure Step 2: Primary corona (negative DC) Step 3: Image exposure Step 4: Developing (positive plus AC) Step 5: Transfer (negative DC) Step 6: Separation Step 7: Fixing Step 8: Drum cleaning

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1-13

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CHAPTER 2

BASIC OPERATION

1. This chapter describes the various functions of the copier, the relationship between the electrical and mechanical systems, and the timing of operations of the various components. In outline diagrams, mechanical drive paths are represented by ( ) and electrical signal paths are indicated by an arrow ( ) accompanied by a signal name.

2. The signals in digital circuits are identified as "1" for HIGH and "0" for LOW. The voltage for LOW is very close to 0V; the voltage for HIGH depends on the circuit. If a signal name has no bar over it (e.g, PDP), "1" is a "TRUE" signal and will usually cause an action to occur; a "FALSE" signal will normally prevent the operation.

Microprocessors are used in the copier. The internal operations of the microprocessors cannot be checked by the service person, so no description is given here. Because PCBs are not normally repaired on the customer's premises, operation of circuits is explained using block diagrams rather than detailed circuit diagrams.

Descriptions of circuits are divided into the following sections: from the sensors to the input section of the main PCBs, and from the output section of the main PCBs to the various loads.

I. BASIC OPERATION .................... 2-1

A. Functions............................... 2-1

B. Outline of Electric Circuitry ...2-2 C. Inputs to the DC Controller ...2-4

D. DC Controller Outputs...........2-7

E. Basic Sequence of Operations

(Direct, continuous copying, 2

sheets)................................ 2-10

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CHAPTER 2 BASIC OPERATION

I. BASIC OPERATION

A. Functions

The copier can be divided into four functional sections: paper pick-up and feed system, expo-

sure system, image formation system, and control system.

Exposure systemControl system

Copy tray

Control panel

Control circuit

Copy delivery assembly

Fixing assembly

Scanner

Pnimary corona

Cleaning unit

Feeder

Cassette 1

Copybord

Optical

system

Photosensi-

tive drum

Transfer and

separation

assembly

Image formation system

Developing

assembly

Pick-up

control

assembly

Multifeeder

assembly

Cassette 2

Paper pick-up and feed system

Figure 2-101

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2-1

CHAPTER 2 BASIC OPERATION

B. Outline of Electric Circuitry

The NP6320’s main mechanisms are controlled by the microprocessor, PROM, and EEPROM

on the DC controller PCB.

1. Microprocessor (Q303: master)

• controls the copying sequence

• controls the control panel

• controls the main motor/scanner motor

• controls the scanning lamp

• controls the serial communication with the ADF

• reads analog signals

2. PROM (Q318)

• contains sequence programs

3. EEPROM (Q315)

• stores data that can be modified in the service mode (replaces conventional variable resistors and switches)

4. Microprossor (Q305: slave)

• controls the document size identification

• controls the serial communication with the sorter

• controls the fans

• controls the paper deck pedestal

Note:

EEPROM is a type of ROM in which data may be erased or stored newly. For this reason, the NP6320’s RAM and ROM are not backed up by a lithium battery.

Note:

The NP6320 is equipped with an A/D converter and, therefore, its microprocessor can read analog signals.

Note:

The main motor (M2) is a stepping motor that uses the oscillation frequency of the crystal oscillator on the power supply assembly. The main motor (M1) is a brushless motor.

2-2

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CHAPTER 2 BASIC OPERATION

(Sensor)

Scanner home position sensor Lens home position sensor Cassette paper sensors Delivery paper sensor Pre-registration paper sensor Multifeeder paper sensor

Cassette size sensors Right door switch Copy board cover switches

AE sensor

Black toner level sensor

Control panel

Thermistors

Control panel

DC controller PCB

Microprocessor

(Q303 : master)

PROM (Q318)

EEPROM

(Q315)

Microprocessor

(Q305 : slave)

DC power supply PCB

HVT

Multifeeder clutch Registration roller clutch Lens solenoid Pick-up clutch solenoid Blank solenoid Multifeeder solenoid Cassette feed clutches

Loads

Fixing roller heater

Scanner motor

Main motor

Primary/Transfer corona assembly Developing bias Grid bias

Document size sensors

Sensors, Switches

Differential PCB

Microprocessor

Sorter controller PCB

Microprocessor

Deck controller PCB

Microprocessor

ADF controller PCB

Lamp regulator

Pre-exposure lamp

Exhaust fan Scanner cooling fan

Total counter

Power switch

Sorter

Paper deck pedestal

ADF

Scanning lamp

Figure 2-102

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2-3

CHAPTER 2 BASIC OPERATION

C. Inputs to the DC Controller

1. Inputs to the DC Controller (1/3)

Q1

J24-1

Multifeeder paper sensor

-2

-3

J312-6

DC controller PCB

5V

-5

MFPD

-4

when paper is over Q1, ‘1’. (light-blocking plate is at Q1)

Pre-registration paper sensor

Scanner home position sensor

Lens home position sensor

Delivery paper sensor

Cassette 1 paper sensor

Q2

Q3

Q4

Q5

Q6

J23-1

J35-1

J33-1

J44-1

J26-1

J312-3

-2

-3

J317-3

-2

-3

J317-6

-2

-3

J313-5

-3

-2

J306-7

-2

-3

5V

-2

PDP1

-1

5V

-2

SCHP

-1

5V

-5

LHP

-4

5V

-3

PDP2*

-4

5V

-6

UCPD

-5

when paper is over Q2, ‘1’. (light-blocking plate is at Q2)

when scanner is at home position, ‘1’. (light-blocking plate is at Q3)

when lens is at home position, ‘1’. (light-blocking plate is at Q4)

when paper is over Q5, ‘0’. (light-blocking plate is not at Q5)

when paper is in upper cassette, ‘1’. (light-blocking plate is at Q6)

5V

-9

LCPD

-8

when paper is in lower cassette, ‘1’. (light-blocking plate is at Q7)

Cassette 2 paper sensor

Q7

Control panel

J34-1

J306-10

-2

-3

Figure 2-103

2-4

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Canon NP6320 Service Manual

CONTENTS

CHAPTER 1

I. FEATURES

II. SPECIFICATIONS

III. NAMES OF PARTS

IV. OPERATION

V. IMAGE FORMATION PROCESS

CHAPTER 2

I. BASIC OPERATION