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COPYRIGHT © 1999 CANON INC.
CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
FY8-13G6-000
REVISION 0
APR. 1999
DADF-B1


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COPYRIGHT © 1999 CANON INC.
CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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 INFORMATION CONTAINED HEREIN SHOULD BE DIRECTED
TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY.
THIS DOCUMENT IS INTENDED FOR ALL SALES AREAS, AND MAY CONTAIN INFORMATION
NOT APPLICABLE TO CERTAIN AREAS.
COPYRIGHT © 1999 CANON INC.
Printed in Japan
Imprimé au Japon
Use of this manual should be strictly su-
pervised 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


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COPYRIGHT © 1999 CANON INC.
CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
i
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.


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COPYRIGHT © 1999 CANON INC.
CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
iii
CONTENTS
CHAPTER 1 GENERAL DESCRIPTION
CHAPTER 2 BASIC OPERATION
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 3 MECHANICAL SYSTEM
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
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
C. Removing the Feed Motor (M2) .... 3-7
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
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