Canon CANOSCAN N1220U User manual

COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
JUNE 2000 JY8-1317-00Z
REVISION 0
SERVICE
MANUAL

COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
COPYRIGHT © 2000 CANON INC.
Printed in Japan
Imprimè au Japon
Use of this manual should be strictly supervised
to avoid disclosure of confidential information.

COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CanoScan N650U F91-4611-200 AZJ000001-
F91-4631-200 CZJ000001-
F91-4641-200 DZJ000001-
F91-4661-200 FZJ000001-
F91-4671-200 LZJ000001-
F91-4681-200 JZJ000001-
F91-4691-200 KZJ000001-
CanoScan N656U F91-4612-200 AZK000001-
F91-4622-200 MZK000001-
F91-4632-200 CZK000001-
F91-4642-200 DZK000001-
F91-4662-200 FZK000001-
F91-4672-200 LZK000001-
F91-4682-200 JZK000001-
F91-4692-200 KZK000001-
CanoScan N1220U F91-4712-200 AZL000001-
F91-4722-200 MZL000001-
F91-4732-200 CZL000001-
F91-4742-200 DZL000001-
F91-4762-200 FZL000001-
F91-4772-200 LZL000001-
F91-4782-200 JZL000001-
F91-4792-200 KZL000001-
LIST OF SERIAL NUMBER

COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
PREFACE
This service manual contains the basic information necessary for servicing the N650U/N656U/
N1220U image scanners.
The service manual consists of the following chapters.
Chapter 1: General Descriptions
Features, specifications, exterior features, installation, customer’s daily
maintenance
Chapter 2: Operation and Timing
Basic operation, optical system, image processing system, control system,
power supply
Chapter 3: Mechanical System
Externals, drive system, optical system, electrical system
Chapter 4: Maintenance and Servicing
Periodical replacement parts, consumable parts durability, periodical
servicing, special tools, solvents and lubricants
Chapter 5: Troubleshooting
Introduction, troubleshooting, location of electrical parts, canon scanner
test
Chapter 6: Parts Catalog
Appendix: General Circuit Diagram, Main PCB Circuit Diagram, USB Connector PCB
Circuit Diagram
The information in this service manual is subject to change as the product is improved.
All relevant information in such cases will be provided by the service information bulletins.
A thorough understanding of the N650U/N656U/N1220U, based on the service manual and
service information bulletins, is vital to the serviceman in maintaining the product quality and
performance, and in locating and repairing the cause of malfunctions.

COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CONTENTS
I. FEATURES ..................................... 1-1
II. SPECIFICATIONS ........................... 1-2
III. EXTERIOR FEATURES .................. 1-4
A. Front View ............................... 1-4
B. Rear View................................. 1-4
IV. INSTALLATION .............................. 1-5
A. Preface..................................... 1-5
B. Installation .............................. 1-6
C. Connecting to the Host Computer
................................................. 1-7
D. Scanning a Document ............ 1-8
V. CUSTOMER’S DAILY
MAINTENANCE .............................. 1-9
CHAPTER 2 : OPERATION AND TIMING
CHAPTER 1 : GENERAL DESCRIPTIONS
I. BASIC OPERATION ........................ 2-1
A. Functions ................................ 2-1
B. Outline of Electrical System .. 2-2
C. Main PCB Input and Output ... 2-3
D. Basic Sequences ..................... 2-4
II. OPTICAL SYSTEM ....................... 2-11
A. Outline .................................. 2-11
B. Document Scanning Sequence ...
............................................... 2-12
C. Contact Image Sensor........... 2-13
D. Drive Motor Control Circuit
............................................... 2-16
III. IMAGE PROCESSING SYSTEM ... 2-17
A. Outline .................................. 2-17
B. Image Processing Functions
............................................... 2-18
IV. CONTROL SYSTEM ..................... 2-20
A. Outline .................................. 2-20
B. Outline of USB ...................... 2-21
V. POWER SUPPLY .......................... 2-23
CHAPTER 3 : MECHANICAL SYSTEM
I. EXTERNALS .................................. 3-1
A. Covers...................................... 3-1
II. DRIVE SYSTEM.............................. 3-5
A. Drive Unit ................................ 3-5
B. Drive Wire ................................ 3-8
III. OPTICAL SYSTEM ......................... 3-9
A. Contact Image Sensor ............. 3-9
IV. ELECTRICAL SYSTEM ................ 3-11
A. USB Connector PCB .............. 3-11
B. Flat Cable .............................. 3-13

COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
I. INTRODUCTION ............................. 5-1
A. Initial Check ............................ 5-1
B. Others...................................... 5-1
II. TROUBLESHOOTING ..................... 5-2
A. Troubleshooting Image Defects ...
................................................. 5-2
B. Troubleshooting Malfunctions
................................................. 5-3
III. LOCATION OF ELECTRICAL PARTS ..
................................................. 5-4
IV. CANON SCANNER TEST ................ 5-5
A. Outline .................................... 5-5
B. How To Use Canon Scanner Test .
................................................. 5-5
CHAPTER 5 : TROUBLESHOOTING
CHAPTER 4 : MAINTENANCE AND SERVICING
I. PERIODICAL REPLACEMENT
PARTS ............................................ 4-1
II. CONSUMABLE PARTS DURABILITY ..
................................................. 4-1
III. PERIODICAL SERVICING .............. 4-1
IV. SPECIAL TOOLS ............................ 4-1
V. SOLVENTS AND LUBRICANTS ...... 4-1
CHAPTER 6 : PARTS CATALOG
FIGURE U01 ACCESSORY ............ 6-2
FIGURE U10 N650U ...................... 6-4
FIGURE U11 N656U ............................. 6-6
FIGURE U20 N1220U ........................... 6-8
APPENDIX
I. GENERAL CIRCUIT DIAGRAM
(CanoScan N650U/656U)............... A-1
II. GENERAL CIRCUIT DIAGRAM
(CanoScan N1220U) ...................... A-2
III. MAIN PCB CIRCUIT DIAGRAM
(CanoScan N650U/N656U) ............ A-3
IV. USB CONNECTOR PCB CIRCUIT
DIAGRAM
(CanoScan N650U/N656U) ............ A-6
V. MAIN PCB CIRCUIT DIAGRAM
(CanoScan N1220U) ...................... A-7
VI. USB CONNECTOR PCB CIRCUIT
DIAGRAM (CanoScan N1220U)... A-10

COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1
GENERAL DESCRIPTIONS
I. FEATURES ..................................... 1-1
II. SPECIFICATIONS ........................... 1-2
III. EXTERIOR FEATURES .................. 1-4
A. Front View ............................... 1-4
B. Rear View ................................. 1-4
IV. INSTALLATION .............................. 1-5
A. Preface..................................... 1-5
B. Installation .............................. 1-6
C. Connecting to the Host Computer
................................................. 1-7
D. Scanning a Document............. 1-8
V. CUSTOMER’S DAILY MAINTENANCE
................................................. 1-9

CHAPTER 1
1 - 1
COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
I. FEATURES
CanoScan N650U/N656U with 600 x 1200 dpi resolution, CanoScan N1220U with 1200 x
2400 dpi resolution are flatbed image scanners incorporating the following features.
1. High gradation and high image quality are achieved by employing a highly sensitive
contact image sensor with LIDE (LED Indirect Exposure) technology for the scanning unit,
and by reading each RGB color by 14 bits and outputting by 8 bits.
2. The scanner is a small size of 256.0(W) x 372.5(D) x 34.0(H) mm, and a light weight of 1.5
kg by using a downsized scanning unit.
3. The scanner can easily be connected to the host computer through a USB interface.
4. Double hinge structure (Z-lid) enables the document cover to hold a thick document.
5. The scanner can be placed vertically to scan by using an optional stand.
6. The scanner draws its power from USB port on the host computer requiring no AC adapter.

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COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
II. SPECIFICATIONS
CanoScan N650U/N656U
MAIN UNIT
· Type : Flat bed image scanner
READING UNIT
· Image sensor : 5104 pixels contact image sensor
· Light source : LED indirect exposure (RGB each)
· Max. document size : A4 or Letter (216 x 297 mm)
· Image output : RGB 8 bits per channel (input 14 bits)
· Resolution : 600 x 1200 dpi
· Scan time : 112 sec. (color, A4, 600 dpi)
37 sec. (grayscale, A4, 600 dpi)
16 sec. (preview)
INTERFACE
· Interface : USB 1.1 (B plug) x 1
OTHERS
· Operating environment : Temperature range, 5 to 35°C
Humidity range, 10 to 90%
Air pressure range, 613 to 1013 hPa
· Power consumption : 2.5W (during operation)
· Dimensions : 256.0(W) x 372.5(D) x 34.0(H) mm
· Weight : 1.4 kg

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COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CanoScan N1220U
MAIN UNIT
· Type : Flat bed image scanner
READING UNIT
· Image sensor : 10208 pixels contact image sensor
· Light source : LED indirect exposure (RGB each)
· Max. document size : A4 or Letter (216 x 297 mm)
· Image output : RGB 8 bits per channel (input 14 bits)
· Resolution : 1200 x 2400 dpi
· Scan time : 449 sec. (color, A4, 1200 dpi)
149 sec. (grayscale, A4, 1200 dpi)
16 sec. (preview)
INTERFACE
· Interface : USB 1.1 (B plug) x 1
OTHERS
· Operating environment : Temperature range, 5 to 35°C
Humidity range, 10 to 90%
Air pressure range, 613 to 1013 hPa
· Power consumption : 2.5W (during operation)
· Dimensions : 256.0(W) x 372.5(D) x 34.0(H) mm
· Weight : 1.4 kg
Specifications are subject to change with product improvement.

CHAPTER 1
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COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
q USB Port
A4
LTR
B5
A4
LTR
B5
1
2
4
5
3
1
q Document Cover
w Document Glass
e Alignment Mark
r Start Button
t Carriage Lock
III. EXTERIOR FEATURES
A. Front View
Figure 1-1
B. Rear View
Figure 1-2

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COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
IV. INSTALLATION
A. Preface
The following installation conditions are required.
1. Ambient temperature should be between 5°C and 35°C, and humidity between 10% and
90%. Avoid locations near water faucets, boilers, humidifiers, or refrigerators.
2. Avoid locations subject to open flame, dust, or direct sunlight. If it is installed near a
window, hang a curtain to block direct sunlight.
3. The room should be well ventilated.
4. Install on a sturdy and level desk, etc.
5. Moving a scanner from a cold place to a warm place can cause condensation on the metal
parts, resulting in a faulty operation. Give the scanner at least one hour to adjust to the
room temperature before unpacking.

CHAPTER 1
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COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
q Carriage Lock
B. Installation
1. Unlocking the carriage lock
The scanner is shipped with the scanning unit locked by the carriage lock to prevent
damage during transport. Unlock the scanning unit to use the scanner.
1) Turn the scanner over.
Figure 1-3
2) Push the carriage lock to the unlock mark position.
Figure 1-4
3) Return the scanner to its standard position.
Note: Always lock the scanning unit during transport.
1

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COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
q USB Port
w USB Cable
12
C. Connecting to the Host Computer
The scanner is connected to the USB port on the host computer using a supplied USB cable.
Refer to "Getting Started" for details. For connecting/disconnecting the host computer's
cables, refer to the manual supplied with the host computer.
1) Connect the flat connector (A plug) of the USB cable to the USB port on the host computer.
2) Connect the square connector (B plug) of the USB cable to the USB port on the scanner.
Figure 1-5

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COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
q Alignment Mark
A4
LTR
B5
A4
LTR
B5
1234
1
Figure 1-6
3) Close the document cover, caring not to dislodge the document.
4) Send the "SCAN" command from the host computer to scan.
D. Scanning a Document
1) Open the document cover.
2) Place a document on the document glass, orienting the image face down and aligning its
top edge with the alignment mark.

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COPYRIGHT  2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
V. CUSTOMER'S DAILY MAINTENANCE
Dirt on a document glass or a document cover may cause an unclear image or lines on an
image. Clean the document glass and the document cover using the following procedures.
1) Disconnect the USB cable from the scanner.
2) Wipe the dirt or dust off the document cover with a soft clean cloth dampened with water
and well wrung, then thoroughly wipe water off with a dry cloth.
3) Wipe the document glass with a dry cloth caring not to leave wiper marks.

COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2
OPERATION AND TIMING
I. BASIC OPERATION ........................ 2-1
A. Functions ................................ 2-1
B. Outline of Electrical System ... 2-2
C. Main PCB Input and Output ... 2-3
D. Basic Sequences .................... 2-4
II. OPTICAL SYSTEM ....................... 2-11
A. Outline .................................. 2-11
B. Document Scanning Sequence....
............................................... 2-12
C. Contact Image Sensor ........... 2-13
D. Drive Motor Control Circuit
............................................... 2-16
III. IMAGE PROCESSING SYSTEM.... 2-17
A. Outline .................................. 2-17
B. Image Processing Functions .......
............................................... 2-18
IV. CONTROL SYSTEM ..................... 2-20
A. Outline .................................. 2-20
B. Outline of USB ...................... 2-21
V. POWER SUPPLY........................... 2-23