CANON NP6621 - Service Manual Immediate Download

FY8-13F4-000

FEB. 1998

CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

SERVICE

MANUAL

REVISION 0

CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

Printed in Japan

Imprimé au Japon

Use of this manual should be

strictly supervised to avoid

disclosure of confidential

information.

Prepared by

OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DEPARTMENT 1

OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DIVISION

CANON INC.

5-1, Hakusan 7-chome, Toride-shi Ibaraki, 302-0023 Japan

IMPORTANT

THE INFORMATION CONTAINED HEREIN IS PUBLISHED BY CANON, INC., JAPAN, AND IS

FOR REFERENCE USE ONLY. 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 INFORMATION CONTAINED HEREIN SHOULD BE DIRECTED

TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY.

Introduction

CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

This Service Manual provides basic facts and figures you will need to service the plain paper copier

NP6621 in the field.

The NP6621 is designed to enable automated copying work and may be configured with the following

accessory; for servicing information on the sorter, ADF, and control card, see their respective Service

Manuals:

1. Cassette Feeding Module-B2

2. Cassette Feeding Module-A2

3. Cassette Feeding Unit-K1

4. Paper Deck Pedestal-K1

5. Control Card IV N

6. ADF-E1

7. RDF-F1

8. Stapler Sorter-D1

9. Sorter 10-B1

10. Remote Diagnostic Device II

This Service Manual contains descriptions on the 1-Cassette Feeding Unit-B1 and the 2-Cassette Feeding

Unit-A2.

Note:

The Cassette Feeding Unit-B2, the Cassette Feeding Unit-A2 the cassette feeding Unit K1, the Paper

Deck Pedestal-K1 and Remote Diagnostic Device II may not be available for sale in some areas.

This Service Manual is organized as follows:

CHAPTER 1, "General Introduction," explains the NP6621's features, specifications, and step-by-step

instructions on how to operate the copier.

CHAPTER 2, "Copying Processes," shows how the NP6621 generates copies while discussing each of

the steps involved.

CHAPTER 3, "Operations and Timing," explains the NP6621's mechanical system by function and

principles behind its electrical system in relation to timing of each operation.

CHAPTER 4, "Mechanical System," provides instructions on how to disassemble/assemble and adjust the

NP6621.

CHAPTER 5, "Installation," provides points to note when selecting the site of installation and instructions

on how to install the NP6621.

CHAPTER 6, `Maintenance and Inspection," gives tables of periodically replaced parts and consumables/

durables as well as a scheduled servicing chart.

APPENDIX contains a general timing chart, general circuit diagrams, and PCB diagrams.

This Service Manual is accompanied by the Service Handbook, which provides information on how to

maintain and inspect the NP6621 through adjustment and troubleshooting work.

Information found in this manual may be updated from time to time for product improvement, and major

updates are communicated in the form of

Service Information bulletins.

All service persons are expected to be thoroughly familiar with this Service Manual, the Service Handbook,

and Service Information bulletins and be ready to respond to the needs of the user.

Introduction

CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

RDF-F1 (Recirculating Document Feeder)

Automatically feeds a set of up to 100 originals to the

platen glass for copying. The RDF can also turn over

two-sided originals for automatic two-sided copying.

MS-B1 (10 bins)

Automotically sorts and groups sets of up to

10 copies.

ADF-E1 (Automatic Document Feeder)

Automatically feeds sets of up to 30 originals to

the copyboard for copying.

Stapler Sorter-D2 (10 bins)

Automatically sorts or groups copies

into 10 bins at (30 pages per set).

Staples sets of up to 20 copies

each.

Control Card IV N

Allows you to monitor the number of

copies made by each card holder.

Cassette Feeding Module-A2

Allows you to increase your paper supply

through the addition of two paper cassettes.

Cassette Feeding Module-B2

Allows you to increase your paper supply

through the addition of one paper cassette.

Cassette Feeding Unit-K1

Allows you to increase your

paper supply through the addition

of three paper cassettes.

Paper Deck Pedestal-K1

Holds up to 1500 sheets of one type of paper.

iii

CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)

CONTENTS

CHAPTER 1

GENERAL DESCRIPTION

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

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

A. Copier .................................................. 1-2

B. Cassette Feeding Module-B2/

Cassette Feeding Module-A2/Cassette

Feeding Unit-K1 .................................. 1-5

C. Paper Deck Pedestal-K1 ..................... 1-6

III. NAMES OF PARTS ................................... 1-7

A. Exterior ................................................ 1-7

B. Cross Section ...................................... 1-8

IV. BASIC OPERATION ................................ 1-13

A. Control Panel ..................................... 1-13

B. Making Copies ................................... 1-16

C. Using the Stack Bypass .................... 1-17

D. User Mode ......................................... 1-19

V. WARNINGS AND ACTIONS ................... 1-26

A. Jam Indicator ..................................... 1-26

B. Cleaning the Static Charge

Eliminator ........................................... 1-33

VI. ROUTINE CLEANING ............................. 1-34

IMAGE FORMATION ................................ 2-1

A. Outline ................................................. 2-1

B. Latent Static Image Formation Block .... 2-2

C. Step 1 (pre-exposure) ......................... 2-3

D. Step 2 (primary charging) .................... 2-3

E. Step 3 (image exposure) ..................... 2-4

F. Step 4 (development) .......................... 2-4

G. Step 5 (transfer) .................................. 2-5

H. Step 6 (separation) .............................. 2-6

Step 7 (fixing) ...................................... 2-7

J. Step 8 (drum cleaning) ........................ 2-7

II. AUXILIARY PROCESS ............................. 2-8

A. Blank Exposure ................................... 2-8

CHAPTER 2

COPYING PROCESS

CHAPTER 3

OPERATIONS AND TIMING

BASIC OPERATIONS ............................... 3-1

A. Functional Construction ....................... 3-1

B. Outline of Electrical Circuitry ............... 3-2

C. Inputs to the DC Controller .................. 3-3

D. Outputs from the DC Controller ........... 3-8

E. Inputs to and Outputs from the Cassette

Feeding Module-B2 Driver PCB ........ 3-13

F. Inputs to and Outputs from the Cassette

Feeding Module-A2 Driver PCB ........ 3-14

G. Inputs to and Outputs from the Cassette

Feeding Unit-K1 Driver PCB ............. 3-16

H. Main Motor Control Circuit ................. 3-21

Basic Sequence of Operations

(2 copies, continuous, AE) ................ 3-22

J. Original Size Detecton Control .......... 3-23

II. EXPOSURE SYSTEM ............................. 3-27

A. Varying the Reproduction Ratio ........ 3-27

B. Lens Drive System ............................ 3-27

C. Scanner Drive System ....................... 3-31

D. Operations of the Scanner in Page

Separation Mode ............................... 3-34

III. IMAGE FORMATION SYSTEM .............. 3-35

A. Outline ............................................... 3-35

B. Sequence of Operations

(image formation system) .................. 3-36

C. Controlling the Scanning Lamp ......... 3-37

D. Controlling the Primary Charging

Roller ................................................. 3-38

E. Controlling the Transfer Roller Bias .... 3-41

F. Controlling the Static Eliminator

Bias .................................................... 3-44

G. Controlling the Developing Bias ........ 3-46

H. Copy Density Automatic Control ....... 3-48

Developing/Cleaning Assembly ........ 3-50

J. Blank Exposure Control ..................... 3-53

K. Primary Charging Roller Cleaning

Control ............................................... 3-55

L. Transfer Roller Locking/Releasing

Control ............................................... 3-56

IV. PICK-UP/FEEDING SYSTEM ................. 3-57

A. Pick-Up from the Machine ................. 3-57

B. Making Two-Sided Copies (1copy) ... 3-61