Canon CanoscanN650U
Transcript of Canon CanoscanN650U
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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
SERVICEMANUAL
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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
Imprim au Japon
Use of this manual should be strictly supervised
to avoid disclosure of confidential information.
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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
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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, customers daily
maintenance
Chapter 2: Operation and Timing
Basic operation, optical system, image processing system, control system,
power supply
Chapter 3: Mechanical SystemExternals, 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.
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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. CUSTOMERS 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
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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 ............................................ 4-1II. CONSUMABLE PARTS DURABILITY ..
................................................. 4-1
III. PERIODICAL SERVICING .............. 4-1
IV. SPECIAL TOOLS............................ 4-1V. 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
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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. CUSTOMERS DAILY MAINTENANCE
................................................. 1-9
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CHAPTER 1
1 - 1COPYRIGHT 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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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 35C
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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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 35C
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.
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1 - 5COPYRIGHT 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 5C and 35C, 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.
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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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q USB Port
w USB Cable
1 2
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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q Alignment Mark
A4
LTR
B5
A4LTR
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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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.
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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
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Control system
Drive motor
Contact image
sensor
Image processing system
Optical system
Host computer
I. BASIC OPERATION
A. Functions
The scanner functions are divided into the three main blocks of optical system, imageprocessing system, and control system.
Figure 2-1
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J1
J3
M1
Main PCB
Start button
S1
USB Connector
PCB
Gate array
Home positionsensor
Q4
Host computer
Controlprogram
J2
J1
J2
Contact
image
sensor
CS1
Buffer
RAM
Drive motor
Figure 2-2
B. Outline of Electrical System
Figure 2-2 shows the outline of electrical system. CPU is not equipped in the main PCB.
The device driver installed in the host computer includes a control program, which functions
as CPU.
Image signals read by the contact image sensor are converted into digital data by the A/D
converter in the gate array. The converted image data are image-processed by the gate array,
then output to the host computer via USB port.
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Figure 2-3
J3-1-2-3
-4-5
-6-7
-8-9
-10
-11
-12
Contact image sensor
Vbus
D-D+
GND
J1-1
-2-3
-4
To host computer
Drive motor drive signal
CS1
HPSENGND
M1
Drive motor
Vob
Misc6GND
VcisVref
TRPHI1Vled
BENGEN
RENGND
"L" when start button was pressed
"H" when scanning unit is in home position
Start
button
Homeposition
sensor
Q4
S1
Main PCB
J1-1-2
-3-4
-5-6
-7-8
GND
+5VGND
D-D+GND
+5V+5V
J2-1-2
-3-4
-5-6
-7-8
PA+PB-
PB+PA-
J2-1-2-3
-4
SCANSW
GND
USB connector PCB
C. Main PCB Input and Output
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Sets gate array
NO
NO
YES
YES
Scanning unit is in homeposition?
NO
YES
Returned more
than 300 mm?
Power ON
Tests gate arrayread/write
Gate array read/writewas tested normally?
NO
YESSets error flag
Sets error flag
1
Returns scanning unit
Scanning unit returnedto the home position?
Stops scanning unit
Sets analog power
Checks PCB IDChecks CIS
Figure 2-4-1
D. Basic Sequences
The basic sequences of the scanner are divided into power ON sequence, calibration
sequence, and document scanning sequence.
1. Power ON sequence
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Figure 2-4-2
NO
YES
1
NO
YES
LED OFF
Standby
NO
YES
Moves scanning unitforward by x pulses
Scanning unit is offthe home position?
Sets error flag
Returns scanningunit by x pulses
LED ON
Adjusts LED ONperiod for whitemark area detection
LED ON periodwas adjusted normally?
Sets error flag
Sets error flag
Detects white mark area
White mark area
was detected normally?
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Figure 2-5
When the hardware setting, home position detection and border detection between black
and white have completed, the scanner is on standby to wait for a command from the host
computer.
Document glass (rear side) White mark area
Black mark area
When the scanner is powered ON, it performs hardware setting, home position detection, and
border detection between black and white according to the flowchart shown in Figure 2-4.
1) Hardware setting
Gate array and buffer RAM in the main PCB are checked if they function normally.
2) Home position detection/Border detection between black and white
The scanner detects the home position by the home position sensor by using a black mark
area and white mark area in the rear of the document glass.
Firstly the home position sensor defines the home position, where the scanning unit reads a
black mark area.
Secondly, the border between a white mark area and black mark area is detected. The
scanning unit moves forward reading image signals with the LED of the contact image sensor
turned ON. When the scanning unit has reached the white mark area, and the peak value of the
light intensity to the scanning unit has reached a white level, the scanning unit stops to define
there as the border between a black mark area and white mark area. The number of steps of the
drive motor is calculated to define the distance from the home position to the white mark area.
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2. Calibration sequence
Figure 2-6-1
Standby
Black level wascorrected normally?
NO
YESSets error flag
Sets black calibrationdata to gate array
NO
YESSets error flag
2
Corrects black level
Data wasobtained normally?
NO
YESSets error flag
Obtains 32 lines of data
Composes blackcalibration data
Black calibration data wasset to gate array normally?
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Figure 2-6-2
NO
YESSets error flag
LED ONperiod was adjusted
normally?
NO
YESSets error flag
Adjusts LED ON period
Composes whitecalibration data
2
Moves scanning unitto white mark area
Scanning unit moved towhite mark area normally?
LED ON
Obtains 16 lines of data
Data wasobtained normally?
NO
YESSets error flag
LED OFF
Moves scanning unitto the home position
Standby
Stores white calibrationdata as a file
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When the host computer sends a calibration command, the scanner performs the
calibration. Calibration is to compose black calibration data and white calibration data by
reading the black mark and white mark in the rear of the document glass as color references
for the proper color reading.
1) Black calibration data composition
Black calibration data is composed by reading and averaging 32 lines of output from the
scanning unit with the LED turned OFF.
2) White calibration data composition
White calibration data is composed by reading 16 lines of each red, green and blue of the
white mark, and averaging the highest 8 lines of output.
Above procedure is performed at high image quality color 600 dpi, color 600/300 dpi, and
grayscale 600/300 dpi and the data is stored as a file in the host computer. For grayscale
600/300 dpi, only green data is processed.
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3. Document scanning sequence
Figure 2-7
Standby
Scan cancellation
is required?
NO
YES
LED ON
Moves scanning unit to thevertical scan start position
Starts document scan
All document lineswere scanned?
NO
YES
LED OFF
Returns scanning unit
Scanning unit returnedto the home position?
YES
Stops drive motor
Image datawas transmitted?
NO
NO
YES
Standby
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II. OPTICAL SYSTEM
A. Outline
The optical system includes the functions of moving the scanning unit by the drive motor,exposing a document by the LED, and collecting the reflected light to the phototransistor array.
Contact image sensor is adopted for the scanning unit, which is a module combined with the
LED for light exposing, the lens array for light collecting, and the phototransistor array for light
receiving to read per line. The drive motor runs by the drive signal sent from the main PCB
and drives the scanning unit via the drive pulley and drive wire.
Figure 2-8
Sliding rod
Contact image sensor
Drive motor
Drive wire
Drive pulley
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B. Document Scanning Sequence
Figure 2-9
Table 2-1
HPDET STUP SCFW SCAN SCRTNSTBY STBY
(A4, 1200dpi, 100%, 24bit color)
8 sec.
SEQUENCE
Times required (s)
Drive motor (M1)
LED ON signal
Interface signal
(Data 1-8)
Scan command is received
Scanning unit position
Home position
Border between
black and white
: Reverse
Document scan area
After a power on sequenceis completed until thescanner receives a scancommand from the hostcomputer.
To maintain the scanner
ready for scan.
After the scanner received a
scan command until the
home position is detected.
To detect the home position
and a border between black
and white.
If the border detection between
black and whiteis failed, the
scanning unit stops there and
proceeds to the next step.
After the home position is
detected until document
scan starts.
To make a gate array setting,
buffer RAM initialization, etc.
as a preparation for scan.
After the scanning unitstarts moving forwarduntil it reaches thestarting position of thescan area specified by thehost computer.
To move the scanning unitwith a uniform speed to the
vertical scanning position
specified by the host
computer.
After the scanning unit
starts scanning until all
area specified by the host
computer are scanned.
To perform various image
processing according to the
command from the host
computer and transmit the
image data during scan.
After the scanning unit
starts moving backward
until it returns to thehome position.
To return the scanning unit
to the home position to
ready for the next scan.
The home position is detected
by the home position sensor.
Sequence
STBY
(Standby)
HPDET
(Home position
detection)
STUP(Setup)
SCFW(Scanning unit
forward)
SCAN
(Document
scan)
SCRTN
(Scanning unit
return)
Purpose Remarks
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C. Contact Image Sensor
1. Structure of the contact image sensor
Figure 2-10 shows an overview of the contact image sensor with LIDE technology. The
contact image sensor has the LED for exposing a document on the end of glass part called the
light conductor section. When the LED is turned ON, the LED light is supplied to the light
conductor section which exposes a document. That is, the LED light indirectly exposes a
document through the light conductor section. This is called LIDE (LED Indirect Exposure).
The light reflected from the document is collected by the phototransistor array through the rod
lens array and is read as an image signal.
Figure 2-10
LED
Light conductor section
Phototransistor array
Rod lens array
Reading position
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Figure 2-11 shows a cross-sectional view of the contact image sensor.
Figure 2-11
Figure 2-12
Phototransistor array(Light receiver section)
Light reflectorsection
Light conductorsection
Illuminated light
Rod lens array
Reflected light
Reading position
R
G
B
Scanning direction
LED
R G B
Image signal
Phototransistor
array
Phototransistor
array
Phototransistor
array
Phototransistor
array
Rod lens array
Sensor
drive
circuitImage
signal
output
The contact image sensor for CanoScan N650U/N656U places 15 phototransistor arrays of
344 light phototransistors each in line, and the contact image sensor for CanoScan N1220U
places 15 phototransistor arrays of 688 light phototransistors each in line. Each
phototransistor converts the received light into an image signal and outputs the data per line
in series.
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2. Image scanning operation
When the contact image sensor moves to the image scanning position, the control program
turns the SP signal to "L" three times per line to light the LED in order of red, green and blue,
and reads the image signal corresponding to each red, green and blue lights. The reading cycle
of 1 line is 15.48 msec.
When scanning a grayscale image, only green LED is ON and the image signal is processed.
Figure 2-13
SP
RLED
GLED
BLED
Image signal
output R G B
5.16ms 5.16ms 5.16ms
R G B R
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D. Drive Motor Control Circuit
Figure 2-14 shows a block diagram of the drive motor control circuit. The control program
analyzes each command sent from the host computer and sends a command to generate motor
clock to the gate array. The gate array generates the four phase motor drive pulse signals
(MA+, MA-, MB+, MB-), which are sent to the drive motor via the motor driver.
When the host computer changes the resolution, the control program sets to change the
frequency of the motor drive pulse signals for the gate array, then changes the rotating speed
of the drive motor.
Figure 2-14
MA+
MB-
MB+
MA-
Main PCB
Drive motor
M1
Host computer
Gate array Motordriver
PA+
PB-
PB+
PA-
J2-1
-2
-3
-4
Control program
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III. IMAGE PROCESSING SYSTEM
A. Outline
Figure 2-15 shows a block diagram of the main functions of the image processing system.The image processing system converts the signals read by the contact image sensor into digital
data, performs various image processing, and outputs the data to the host computer via USB
port.
Figure 2-15
6. Packing
1. Contactimage sensor
To host computer
3. Resolutionconversion
4. Calibration2. A/D
conversion
5. Gammacorrection
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Sampling point
Moving direction
Scanning unit
A B C D E F G H
A+B2 C+D2 E+F2 G+H2
Sampling point
Moving direction
Scanning unit
B. Image Processing Functions
1. Contact image sensor
The gate array outputs clock signals based on the command from the control program to the
contact image sensor. The contact image sensor lights the LED in order of red, green and blue
according to the clock signals, then outputs 1 line of image signal proportional to the light
intensity received by the phototransistor.
2. A/D conversion
Analog image signals output from the contact image sensor are converted into the digital
image data of 14 bits each by A/D converter in the gate array in order of red image signal,
green image signal, and blue image signal.
3. Resolution conversion
1) Resolution conversion in the horizontal scanning direction
Basic resolution of CanoScan N650U/N656U is 600 dpi, and selective at 600 dpi, 300 dpi,
150 dpi, 75 dpi. Basic resolution of CanoScan N1220U is 1200 dpi, and selective at 1200 dpi,600 dpi, 300 dpi, 150 dpi, 75 dpi. Resolution conversion in the horizontal scanning direction
is performed by averaging the thinned data and output data.
Example: To change the resolution to 1/2, image data is converted as shown in Figure 2-16.
Figure 2-16
2) Resolution conversion in the vertical scanning direction
The control program changes the scanning unit moving speed to change the resolution in
the vertical scanning direction. When increasing the resolution, the scanning unit moves at a
low speed to read more lines as shown in Figure 2-18.
Figure 2-17
Figure 2-18
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Input Buffer RAM I (for writing)
Buffer RAM II (for reading) Output
Fixed volume has been written
Buffer RAM I (for reading) Output
Input Buffer RAM II (for writing)
Sampling point
Moving direction
Scanning unit
Figure 2-19
4. Calibration
When the contact image sensor reads a document of an even density, the image signal
corresponding to each pixel is not uniform for the following reasons.
1) Light intensity of LED is not uniform.
2) There is variation in the sensitivity of the phototransistors.
3) There is a slight output from the phototransistors even when there is no input.These variations are corrected by the calibration. Calibration data is used as standard
density data when scanning a document. Scanned image data is compared to the standard
density data for the image data correction. The calibration converts the image data from 14
bits to 12 bits each color.
5. Gamma correction
Calibrated red, green and blue image data are divided uniformly into 4096 gradations
according to the document density. The contrast and density of this image data are adjusted
by the gamma correction. The gate array writes gamma curve specified by the control program
into the buffer RAM before scanning a document. Image scan starts and the image data input
to the buffer RAM is converted to 8 bits by the gamma curve data and is output.
6. Packing
Processed image data is temporarily stored in the buffer RAM before sent to the host
computer. The buffer RAM is divided into the writing block and reading block. While data is
written into the writing block, the data is read from the reading block. When fixed volume has
been written, the writing switches to the reading.
Figure 2-20
When decreasing the resolution, the scanning unit moves at a fast speed to read less lines.
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IV. CONTROL SYSTEM
A. Outline
The control system consists of the gate array, buffer RAM (4Mbit), and ROM (2Mbit). The
CPU is not equipped with the scanner. The control program in the device driver installed on
the host computer controls the scanner operation by setting a comand directly to the gate
array register. Buffer RAM is used as a work memory for image processing.
The scanner communicates with the host computer via USB interface in the gate array.
Figure 2-21
gate array
ROM
BufferRAM
Host computer
Control program USBI/F
A0-7
D0-15
Control signal
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Figure 2-22
Host computer
Hub 1
Hub 2
Hub 3
Hub 4
Hub 5
Node
Node
Hub 6
Node
Node
Node
Node
Node
Node
NodeLayer 1
Layer 2
Layer 3
Layer 4
Layer 5
Layer 6
B. Outline of USB
The scanner is connected to the host computer via USB. USB (Universal Serial Bus) is the
next generation general-purpose input-output interface to connect the computer peripheral
devices.
1. Features of USB
1) Connects peripheral devices to a computer.
2) Connects up to 127 devices by a tree structure.
3) Connects by 12 Mbps of "full speed mode" or 1.5 Mbps of "low speed mode". This scanner is
conforming to "full speed mode".
4) Supports hot plug (connectable/disconnectable with the power ON).
5) The scanner power is supplied through USB.
2. Connection of USB Devices
USB devices are connected to a host computer by a tree structure consisting of device
called "node" and "hub" which is a group of "node" as shown in Figure 2-22. The treestructure has the following conditions.
1) Able to connect up to 127 "node" and "hub" in total.
2) Limited up to 6 layers.
3) USB cable must be 5 meters or shorter.
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3. USB Data Transfer
USB data is transferred in the following four data structures called "packet".
1) Token packet : Used to start a data transfer
2) Handshake packet : Used to report the status of a data transfer
3) Data packet : Used to send and receive data
4) Special packet : Used for other transfer
USB device may support multiple data transfer endpoints, so there are four types of data
transfer protocols.
1) Isochronous transfer : Allocates a data transfer time to a device. Highest priority is give
but any error is not corrected.
2) Interrupt transfer : Periodically transfers data within a specified waiting time. Secondpriority is given.
3) Control transfer : Used to configure the host computer when USB device is attached/
removed.
4) Bulk transfer : Lowest priority is given but larger amounts of data is sequentially
transferred to a free bus.
This scanner uses control transfer and bulk transfer.
Figure 2-23
A Plug B Plug
USB connector has A plug for connecting to upper stream and B plug for connecting to
lower stream.
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V. POWER SUPPLY
The scanner draws its power +5V from USB interface. +5V is used for the digital circuit in
the main PCB.
Power supply to the analog circuit is ON/OFF controlled by the gate array. Drive motor,contact image sensor, and analog circuit are supplied with power as necessary. 5.5V step up
circuit in the main PCB is used for the analog circuit and for driving the contact image sensor.
Figure 2-24
+5V
Main PCB
Drive motor
Contact imagesensor
Host comuter
USBport
Gatearray
5.5V step up circuit LED
Digital circuit
Analog circuit
5.0V reference voltage
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COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3
MECHANICAL SYSTEM
I. EXTERNALS .................................. 3-1
A. Covers...................................... 3-1
II. DRIVE SYSTEM..............................3-5
A. Drive Unit ................................ 3-5B. 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
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Figure 3-1
q Document Cover
w Document Glass Unit
e Base Frame
A4
LTR
B5
A4
LTR
B5
1
2
3
I. EXTERNALS
When cleaning, checking or repairing inside the scanner, remove the necessary covers using
the following procedures.
A. Covers
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q Document Cover
w Hinge
1. Removing the document cover
1) Pull the hinge unit of the document cover to the left, remove the right hinge unit, then warp
the document cover to remove.
Figure 3-2
3
1
2
A4
LTR
B5
A4LTR
B5
1
2
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Figure 3-3
Note: Do not lift the hook part excessively since it is attached to the document glass with a
double-sided tape.
q End Hookw Document Glass Unit
A4
LTR
B5
A4LTR
B5
2
1
2. Removing the document glass unit
1) Remove the document cover.
2) Unhook the hook in the end of the document glass unit, then lift the hook part.
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q Front Hook
w Document Glass Unit
A4
LTR
B5
A4
B5
LTR
1
2
Figure 3-5
Note: Take care not to smear the rear side of the document glass unit (especially the spacer
sliding surface).
A4
B5
LTR
A4
LTR
B51
q Document Glass Unit
3) Unhook the hook in the front of the document glass unit, then slide the document glass unit
backward.
Figure 3-4
4) Lift the front of the document glass unit, then pull forward to remove it.
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Figure 3-6
Note: Do not damage or lose the seal to reuse it.
q Wire Stopper
w Seal
1
2
II. DRIVE SYSTEM
A. Drive Unit
1. Removing the drive unit1) Remove the document cover.
2) Remove the document glass unit.
3) Remove the seal from the back of the scanner, push the wire stopper backward to remove it
from the base frame through the left hole.
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2. Precautions when attaching the drive unit
1) Apply appropriate amount of grease to the positions marked with net in the figure 3-9.
Figure 3-9
2) Locate the drive wire referring to II-B-2.
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1
q Drive Wire
B. Drive Wire
1. Removing the drive wire
1) Remove the document cover.
2) Remove the document glass unit.
3) Remove the drive unit.
4) Remove the wire spring to remove the drive wire.
Figure 3-10
2. Precautions when attaching the drive wire
1) When the drive wire is twisted, untwist it to a natural condition. Otherwise a twisted drive
wire can affect an image.
2) Locate the drive wire as shown in Figure 3-11.
Figure 3-11
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Figure 3-12
III. OPTICAL SYSTEM
A. Contact Image Sensor
1. Removing the contact image sensor
Note: Take care not to touch the phototransistor of the contact image sensor.
1) Remove the document cover.
2) Remove the document glass unit.
3) Remove the seal from the back of the scanner unit, push the wire stopper backward to
remove it from the base frame through the left hole as shown in Figure 3-6.
4) Remove two spacers on both ends of the contact image sensor.
5) Lift the drive unit end part, then remove the drive wire from the gear.
6) Move the drive unit to the center.7) Hold up the front of the contact image sensor, slide it to the right, then lift it to remove.
1
2
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Figure 3-13
Note: Do not lose the spring under the contact image sensor.
q Contact Image Sensor
w Sensor Cable
e Spring
1
3
2
8) Remove the sensor cable from the ontact image sonsor, then remove the contact image
sensor.
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Figure 3-15
IV. ELECTRICAL SYSTEM
A. USB Connector PCB
1. Removing the USB connector PCB
1) Remove the document cover.
2) Remove the document glass unit.
3) Insert flat-blade screw drivers into both sides of the USB connector PCB to push it forward.
q Connector J2
1
Figure 3-14
4) Disconnect the connector J2 to remove the USB connector PCB.
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Figure 3-16
q Ground
w Sliding Rod
1
2
2. Precautions when attaching the USB connector PCB
1) Make sure to contact the ground of the USB connector PCB with the sliding rod.
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q Flat Cable
w Ferrite Core
Figure 3-17
1
2
B. Flat Cable
1. Removing the flat cable
Note: Do not bend or deform the flat cable when removing the flat cable.
1) Remove the document cover.
2) Remove the document glass unit.
3) Remove the seal from the back of the scanner unit, push the wire stopper backward to
remove it from the base frame through the left hole as shown in Figure 3-6.
4) Remove two spacers on both ends of the contact image sensor.
5) Lift the drive unit end part, then remove the drive wire from the gear.
6) Move the drive unit to the center, and disconnect the connector J3.
7) Remove the USB connector PCB, and disconnect the connector J2.
8) Pull to remove the flat cable from the ferrite core.
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Figure 3-19
1
q Bend
2. Precautions when atttaching the flat cable
1) Take care not to bend or deform the flat cable.
2) Locate the flat cable as follows.
a. The flat cable on the USB connector PCB side is attached with a double-sided tape. Align
the bend in the flat cable with the left end corner of the base frame.
Figure 3-18
b. Straighten the bent end of the flat cable on the driver unit side and pass it through the
ferrite core.
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Figure 3-21
q Connector J3
1
8mm
3) Re-bend the flat cable as shown in Figure 3-20 and connect it to the connector J3.
Figure 3-20
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COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
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
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I. PERIODICAL REPLACEMENT PARTS
None
II. CONSUMABLE PARTS DURABILITY
None
III. PERIODICAL SERVICING
None
IV. SPECIAL TOOLS
None
V. SOLVENTS AND LUBRICANTS
Lubricants used for disassembly and assembly of the scanner.
Table 4-1
No.
1 Grease TKC-0955To be applied to the sliding part between the scanningunit and sliding rod.MOLYKOTE EM-50L
Name Tool No. Usage / Remarks
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COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 5
TROUBLESHOOTING
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
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I. INTRODUCTION
A. Initial Check
Check if the operating environment conforms to the following conditions.
1. Line voltage is within 10% of the rated value.
2. Ambient temperature and humidity conform to the operating environment. (Refer to
CHAPTER 1, II. SPECIFICATIONS)
3. The scanner is not installed near a water faucet, boiler, humidifier, open flame, or in dusty
place.
4. The scanner is not exposed to direct sunlight. If it must be installed by a window, hang a
curtain to block direct sunlight.
5. The scanner is installed in a well-ventilated place.
B. Others
Moving a scanner from a cold place to a warm place can cause condensation on the metal
parts, resulting in a faulty operation.
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II. TROUBLESHOOTING
Causes and corrective actions for possible image defects and malfunctions during operation
are described below.
A. Troubleshooting Image Defects
1. Image not output
Cause 1 : Faulty connection of the USB cable
Corrective action : Securely connect the USB cable.
Cause 2 : Faulty contact image sensor
Corrective action : Replace the contact image sensor.
Cause 3 : Faulty main PCB
Corrective action : Replace the drive unit.
2. Uneven image density or lines
Cause 1 : Dirt on the document cover or document glass
Corrective action : Clean the document cover or document glass.
Cause 2 : Faulty calibration data
Corrective action : Perform the calibration.
Cause 3 : External light is entering into the scanner. External light entering into
the contact image sensor can cause uneven image density.
Corrective action : Fully close the document cover. If it is impossible, cover with a sheet
etc. to prevent external light.
Cause 4 : Faulty contact image sensor
Corrective action : Replace the contact image sensor.
Cause 5 : Faulty main PCB
Corrective action : Replace the drive unit.
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B. Troubleshooting Malfunctions
1. Host computer not detecting the scanner
Cause 1 : Faulty installation of the device driver
Corrective action : Uninstall the device driver and reinstall it.
Cause 2 : Faulty connection of the USB cable
Corrective action : Securely connect the USB cable to the scanner and host computer.
Cause 3 : Faulty main PCB
Corrective action : Replace the drive unit.
2. Scanner not operating
Cause 1 : Carriage lock is locked.
Corrective action : Unlock the carriage lock.
Cause 2 : Faulty connection of the flat cableCorrective action : Securely connect the flat cable to the contact image sensor and main
PCB.
Cause 3 : Faulty contact image sensor
Corrective action : Replace the contact image sensor.
Cause 4 : Faulty main PCB
Corrective action : Replace the drive unit.
3. Drive motor not running
Cause 1 : Faulty connection of the connector J2
Corrective action : Securely connect the connector J2.
Cause 2 : Faulty drive motor
Corrective action : Replace the drive unit.
Cause 3 : Faulty main PCB
Corrective action : Replace the drive unit.
4. LED of the contact image sensor not lighting
Cause 1 : Faulty connection of the connector
Corrective action : Securely connect the flat cable.
Cause 2 : Faulty contact image sensor
Corrective action : Replace the contact image sensor.
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CHAPTER 5
5 - 4 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
q USB Connector PCB
w Main PCB
e Contact Image Sensor
r Home Position Sensor
t Start Button
y Drive Motor
Figure 5-1
1
3
6
4
5
2
III. LOCATION OF ELECTRICAL PARTS
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CHAPTER 5
5 - 5COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
IV. CANON SCANNER TEST
A. Outline
Canon Scanner Test is utility software to check if faulty scanner operation is due tohardware or communication with a host computer.
Windows : ScanTest.exe (English/Japanese is switched according to the language to be
used in Windows.)
Macintosh : ScantestHMe
B. How To Use Canon Scanner Test
1. Operating environment
Windows platform
1) CanoScan N650U/N656U/N1220U
2) PC/AT Compatibles (Pentium or faster is recommended.)
3) Windows 98 Operating System
4) Scanner Device Driver
Macintosh platform
1) CanoScan N650U/N656U/N1220U
2) Power Macintosh
3) Macintosh OS (Version 8.5 or later)
4) Scanner Device Driver
Note: Install the scanner device driver before using the Canon Scanner Test.
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2. Functions
Canon Scanner Test has the following functions.
1) USB Information (Windows only)
Scanner information recognized by Windows.
2) Scanner Information
Product ID, ROM version, etc. are shown when the scanner is properly communicated with
the host computer.
3) Scanner Self Test
Scanner self test is performed.
4) Calibration
Scanner calibration is performed.
5) ScanAny image is scanned and saved as an image file in the same folder with the Canon Scanner
Test.
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3. Functions descriptions
1) USB Information (Windows only)
Select "USB Information" from the "Function" menu to display as shown in Figure 5-2.
Figure 5-2
Vendor Description : Manufacturer name (Canon) of the scanner connected.
Device Description : Product name of the scanner connected.
Port Name : Port name of the scanner recognized by Windows.
Local Name : Product name of the scanner connected.
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2) Scanner Information
Select "Scanner Information" from the "Function" menu to display as shown in Figure 5-3
(Windows) or Figure 5-4 (Macintosh).
Figure 5-4
Vendor ID : Manufacturer name (Canon) of the scanner connected.
Product ID : Product name of the scanner connected.
ROM Version : Scanner controller version.
Figure 5-3
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3) Scanner Self Test
Select "Scanner Self Test" from the "Function" menu to display a dialog as shown in Figure
5-5 (Windows) or Figure 5-6 (Macintosh).
Figure 5-5
Figure 5-6
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CHAPTER 5
5 - 10 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Click "OK" to perform Scanner Self Test. When it has completed normally, a dialog as
shown in Figure 5-7 (Windows) or Figure 5-8 (Macintosh) is displayed.
Figure 5-7
Figure 5-8
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4) Calibration
Select "Calibration" from the "Function" menu to display a dialog as shown in Figure 5-9
(Windows) or 5-10 (Macintosh).
Figure 5-9
Figure 5-10
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CHAPTER 5
5 - 12 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Click "OK" to perform Calibration. When it has completed normally, a dialog as shown in
Figure 5-11 (Windows) or Figure 5-12 (Macintosh) is displayed.
Figure 5-11
Figure 5-12
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CHAPTER 5
5 - 13COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
5) Scan
Select "Scan" from the "Function" menu to display a dialog as shown in Figure 5-13
(Windows) or Figure 5-14 (Macintosh).
Figure 5-13
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CHAPTER 5
5 - 14 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Figure 5-14
* Scan count : Specify the number of scan.
* Resolution : Select a resolution for the image to be scanned.
* Image : Select a processing method of the scanned image. When "Read in memory (no
file)" is selected, scanned image is read into the memory, then abandoned
after readout. When "Save to TIFF file" is selected, the file of "img0.tif" is set
up in the same folder with the Canon Scanner Test.
File capacity is as follows.75 dpi : Approx. 1.6 MByte
150 dpi : Approx. 6.5 MByte
300 dpi : Approx. 26.2 MByte
600 dpi : Approx. 104.9 MByte
1200 dpi : Approx. 15.0 MByte
Note: Confirm before scanning that the available disk space on the HDD in which the
Canon Scanner Test is installed exceeds above file capacity.
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5 - 15COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
4. Error Message
Causes and corrective actions for error messages which may occur during Canon Scanner
Test are described below.
1) When Canon Scanner Test is started, "Unable to find USB scanner" is displayed.
Cause 1 : Device driver for the scanner is not installed in the host computer.
Corrective action : Install the device driver.
Cause 2 : Scanner is not detected by the host computer.
Corrective action : Properly detect the scanner by the host computer.
2) Scanner Information is not displayed or Scanner Self Test terminates without scan
operation.
Cause 1 : Carriage lock is locked.
Corrective action : Unlock the carriage lock.
Cause 2 : Scanner is not detected by the host computer.
Corrective action : Properly detect the scanner by the host computer.
Cause 3 : Faulty flat cable.
Corrective Action : Check the flat cable connector. If it is normal, replace the flat cable.
Cause 4 : Faulty contact image sensor.
Corrective Action : Replace the contact image sensor.
Cause 5 : Faulty main PCB.
Corrective Action : Replace the drive unit.
3) "Carriage lock is locked" is displayed.
Cause 1 : Carriage lock is locked.
Corrective Action : Unlock the carriage lock.
Cause 2 : Faulty drive motor/faulty home position sensor.
Corrective Action : Replace the drive Unit.
4) "Unable to open file" is displayed.
Cause : Canon Scanner Test is started from a CD-ROM or write-protect HDD.
Corrective Action : Copy the Canon Scanner Test on a writable HDD to use.
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COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6
PARTS CATALOG
FIGURE U01 ACCESSORY ............ 6-2
FIGURE U10 N650U ...................... 6-4
FIGURE U11 N656U ............................. 6-6
FIGURE U20 N1220U ........................... 6-8
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6 - 1COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
(Brank Page)
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6 - 2 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
ACCESSORYFIGURE U01
2
1
3
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6 - 3COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
FIGURE&
KEY NO.DESCRIPTION SERIAL NUMBER/REMARKS
Q'
T
Y
PART NUMBER
RANK
U01-01
02
03
104-0138-0SP
002-0827-0SP
003-7204-0SP
CABLE, USB
STAND ASSEMBLY
TAPE
1
1
1
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6 - 4 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
N650UFIGURE U10
A4
LTR
B5
A4
B
5
LTR
1
2
3
5
7
8
9
10
1112
13
14
16
15
17
18
4
6
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6 - 5COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
FIGURE&
KEY NO.DESCRIPTION SERIAL NUMBER/REMARKS
Q'
T
Y
PART NUMBER
RANK
U10-01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
002-0820-0SP
002-0821-0SP
051-0508-0SP
060-0121-000
003-5248-0SP
104-0152-000
056-0032-000
104-0151-000
NPN
003-5250-0SP
051-0506-000
077-0632-000
054-0231-000
051-0505-000
004-0393-000
084-5505-0SP
NPN
051-0574-000
DOCUMENT COVER ASSEMBLY
PLATEN GLASS ASSEMBLY
SPACER
CONTACT IMAGE SENSOR
SENSOR DRIVE ASSEMBLY
CABLE, FLAT, 12P
SPRING
CABLE, FLAT, 8P
SLIDING ROD
WIRE
HOOK
SCREW
PLATE, BUTTON
BUTTON, FUNCTION
USB I/F PCB ASSEMBLY
SEAL
BASE FRAME
LOCK, CARRIAGE
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
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6 - 6 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
N656UFIGURE U11
A4
LTR
B5
A4
B5
LTR
1
2
3
5
7
8
9
10
1112
13
14
16
15
17
18
4
6
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6 - 7COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
FIGURE&
KEY NO.DESCRIPTION SERIAL NUMBER/REMARKS
Q'
T
Y
PART NUMBER
RANK
U11-01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
002-0883-0SP
002-0896-0SP
051-0508-0SP
060-0121-000
003-5248-0SP
104-0152-000
056-0032-000
104-0151-000
NPN
003-5252-0SP
051-0506-000
077-0632-000
054-0231-000
051-0505-000
004-0393-000
084-5509-0SP
NPN
051-0620-000
DOCUMENT COVER ASSEMBLY
PLATEN GLASS ASSEMBLY
SPACER
CONTACT IMAGE SENSOR
SENSOR DRIVE ASSEMBLY
CABLE, FLAT, 12P
SPRING
CABLE, FLAT, 8P
SLIDING ROD
WIRE
HOOK
SCREW
PLATE, BUTTON
BUTTON, FUNCTION
USB I/F PCB ASSEMBLY
SEAL
BASE FRAME
LOCK, CARRIAGE
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
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6 - 8 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
N1220UFIGURE U20
A4
LTR
B5
A4
B5
LTR
1
2
3
5
7
8
9
10
1112
13
14
16
15
17
18
4
6
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6 - 9COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
FIGURE&
KEY NO.DESCRIPTION SERIAL NUMBER/REMARKS
Q'
T
Y
PART NUMBER
RANK
U20-01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
002-0884-0SP
002-0893-0SP
051-0508-0SP
060-0122-000
003-5249-0SP
104-0152-000
056-0032-000
104-0151-000
NPN
003-5251-0SP
051-0506-000
077-0632-000
054-0231-0SP
051-0625-000
004-0393-000
084-5506-0SP
NPN
051-0617-000
DOCUMENT COVER ASSEMBLY
PLATEN GLASS ASSEMBLY
SPACER
CONTACT IMAGE SENSOR
SENSOR DRIVE ASSEMBLY
CABLE, FLAT, 12P
SPRING
CABLE, FLAT, 8P
SLIDING ROD
WIRE
HOOK
SCREWS
PLATE, BUTTON
BUTTON, FUNCTION
USB I/F PCB ASSEMBLY
SEAL
BASE FRAME
LOCK, CARRIAGE
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
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COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
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
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APPENDIX
A - 1COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
VOB
MISC6
GND
VCIS
VREF
TR
PHI1
VLED
BEN
GEN
REN
GND
J3
CS1
1 2 3 4 5 6 7 8 910
11
12
1 2 3 4 5 6 7 8 910
11
12
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4
GND
+5V
GND
D-
D+
GND
+5V
+5V
VBUS
D-
D+
GND
J2
J1
J1
HomePositionSensor
StartBu
tton
M1
4
3
2
1
J2
PA-
PB+
PB-
PA+
S1
Q4
MainPCB
ContactImage
Sensor
USBConnectorPCB
DriveMotor
I. GENERAL CIRCUIT DIAGRAM (CanoScan N650U/N656U)
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APPENDIX
A - 2 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
II. GENERAL CIRCUIT DIAGRAM (CanoScan N1220U)
VOB
MISC6
GND
VCIS
VREF
TR
PHI1
VLED
BEN
GEN
REN
GND
J3
CS1
1 2 3 4 5 6 7 8 910
11
12
1 2 3 4 5 6 7 8 910
11
12
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4
GND
+5V
GND
D-
D+
GND
+5V
+5V
VBUS
D-
D+
GND
J2
J1
J1
HomePositionSensor
StartButto
n
M1
4
3
2
1
J2
PA-
PB+
PB-
PA+
S1
Q4
MainPCB
ContactImage
Sensor
USBConnectorPCB
DriveMotor
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APPENDIX
A - 3COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
14
211
U3
12
15
30
18
3
20
4
22
5
24
7
26
8
28
9
32
10
33
31
29
32
27
33
25
34
23
36
21
37
19
38
15
39
40
42
46
48
49
47
45
41
39
38
35
37
36
34
WR
RD
RAS
CAS
A0
A1
A2
A3
A4
A5
A6
A7
A8
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A0
R1
RA1
RA2
RA3
+5VD
A1
A2
A3
A4
A5
A6
A7
A8
1 2 3 4
1 2 3 4
8 7 6 5
8 7 6 5
1 2 3 4
8
16
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DB8
DB9
DB10
DB11
DB12
DB13
DB14
DB15
17
18
19
22
23
24
25
26
13
27
14
29
28
7 6 5
A0
A1
A2
A3
A4
A5
A6
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
I/O8
I/O9
I/O10
I/O11
I/O12
I/O13
I/O14
I/O15
A7
A8
WE
OE
RAS
LCAS
HCAS
C1 (D
GND)
(A0
A9)
1
6
20
21
35
40
GNDGND
GNDVCC
VCC
VCC
VOB
TR
PHI1
(AGND)
C3
C4
C5
C6
C7
C2
TP4
79
78
77
76
75
74
73
3
57
1
2
4
6
96
58
59
60
91
CP2
CP1
RS
PHI2
PHI1
TR2
TR1
CMODE
OSR
OSG
VBANDGAP
VREFLO
VREFMID
LAMPR
LAMPG
LAMPB
VREFHI
TEST
OSB(AGND)
REN
GEN
MA+
MA
-
MB+
MB
-
BEN
+5VD R
9
U2
C27
C28
C29
C31
(DGND)
RA4
1 2 3 4
8 7 6 5
10
1112
13
A A B B
94
93
95
SENSE
A
SENSE
B
SENSE
GND
64
63
PSENSE#1
PSENSE#2
65
66
67
70
71
72
MISC
I/O
#1
MISC
I/O
#2
MISC
I/O
#3
MISC
I/O
#4
MISC
I/O
#5
MISC
I/O
#6
84
83
D+
D-
51
50
SCL
SDA
90
85
80
54
55
RESET
BP
ACTIVE/SUSPENDED
EXTCLK/CRYST
AL
24/48
52
53
CRYSTALOUT
CRYSTALIN
SENA
SENB
HPSEN
SCANSW
MISC2
D+
D-
MISC4
MISC5
MISC6
(MOTOR
GND)
+5VD R
21
R14
+5VD R
17
R19
R15
TP9
TP
C35
R91
R90
R10
TP7 T
P
(DGND)
TP3
TP8
Y1
TP10
+5VD
FB1
5 6 1 2 3
748
SDA
SCL
A0
A1
A2
VCC
GND
WP
C8
(DGND)
(DGND)
R12D
R11
(DGND)
92
89
88
NC
NC
NC
98
87
81
69
61
57
44
31
17
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
43
30
16
VDRAM
VDRAM
VDRAM
97
86
68
62
56
VD
VDVD
VD
VD
82VREG
100
8
AGND
AGND
99
9
VA
VA
+5VD C
18
C17
C16
C15
C14
C11
C10
C9
C21+
5VD
VREG
C20
C19
C91
V
A
(AGND)
NS
-USB
NC
NC
R18
III. MAIN PCB CIRCUIT DIAGRAM (CanoScan N650U/N656U)
(1/3)
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APPENDIX
A - 4 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
+5VD
MISC4
MISC5
U1
1 2 3 4
8 7 6 5
BE
C
VPI
Q2
R31
S1
G1
S2
G2
D1
D1
D2
D2
HPSEN
C41 R
28
VPI R
25
3
22
3
1
44
1
R26
VPI
Q4
TP5
R42
FB4
TP6
+5VD
R36
C36
C45
L3
J1
1 2 3 4 5 6 7 8
C34
C50
R13
1
2
4
3L1
R35
VREG
R5
R4
C12
C13
D-
D
+
+
+
+
VCIS
C32
C24
C39
C23
C38
C40
R6
3
2
1
VIN
VOUT
VSS
21 3
5 4
C47
VCC
GND
CTL
VAG
Q3
OUT C
V55
R7
R2
D1
C44
R40
DQ7 S
G
R24
R30
8 7 6 5
1 2 3 4
D/C
IPK/2
VIN
C/I
S/C
OUT
T/C
GND
U4
L2
C22
C42
R29
R27R
22
E
B
CQ9
R34
Q6
BE
C
E
B
CQ8
R33
B
Q5
E
C
V
A
R20
GND
VCC
2
3
4
5
MISC5
+5VD
VPI
R16
Q16
Q1
(2/3)
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APPENDIX
A - 5COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
+
C30
R46
VPI
U9
U11
1 2 3 4 5 1 2 3 4 5
10
9 8 7 6 10
9 8 7 6
(A+)
(A-)
(B-)
(B+)
R59
R55
R58
R62
PA+
PB
-
PB+
PA
-
1 2 3 4J2
R54
OUT4
OUT3
OUT1
OUT2
GND
VCC
IN4
IN3
IN1
IN2
VCC
IN4
IN3
IN1
IN2
OUT4
OUT3
OUT1
OUT2
GND
MB
-
MB+
MA+
MA
-
C49
C52
R41
SENA
SENB
R57
R53
SCANSW
(BUTTON)
C82
R78
+5VD
R89
S1
+
VAG R
92
R23
D3
R32
B Q19
E C
C46
MISC2
R37
14
VEE
13
12
+
MISC6
R82
C37
J3
C87
C90
VCIS
TP2
TP1
VOB
R8
R3
Q17A
OR
TR
PHI1
Q17B
OR
C26
C25
V55
R83
C89
1 2 3 4 5 6 7 8 9 10
11
12
CQ13
CQ14
CQ15
R79
R80
CQ12
CQ10
CQ11
B
E
B
E
B
E
B
E
B
E
B
E
REN
GEN
BEN
R87
R86
R85
VEE
VCC
VEE
VCC
VEE
VCC
VCIS
VCIS
VCIS
3 2 5 6 10
9
+ -+ -+ -
U12C
8U12B
7U12A
1
+ -
VAG R
38
R39
VCIS
VCC
U12D
R75
R77
VCIS
R69
R73
VCIS
11 4
C43
R81
444 111111
(3/3)
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APPENDIX
A - 6 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
F.G.
J2
8
7
6
5
4
3
2
1
C3C1
D2D1
C2 C4
J1
1
2
4
3
VBUS
D -
D +
GND
D3D43 4
2 1
R1
R2
L1
IV. USB CONNECTOR PCB CIRCUIT DIAGRAM(CanoScan N650U/N656U)
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APPENDIX
A - 7COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
14
211
U3
12
15
30
18
3
20
4
22
5
24
7
26
8
28
9
32
10
33
31
29
32
27
33
25
34
23
36
21
37
19
38
15
39
40
42
46
48
49
47
45
41
39
38
35
37
36
34
WR
RD
RAS
CAS
A0
A1
A2
A3
A4
A5
A6
A7
A8
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A0
R1
RA1
RA2
RA3
+5VD
A1
A2
A3
A4
A5
A6
A7
A8
1 2 3 4
1 2 3 4
8 7 6 5
8 7 6 5
1 2 3 4
8
16
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DB8
DB9
DB10
DB11
DB12
DB13
DB14
DB15
17
18
19
22
23
24
25
26
13
27
14
29
28
7 6 5
A0
A1
A2
A3
A4
A5
A6
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
I/O8
I/O9
I/O10
I/O11
I/O12
I/O13
I/O14
I/O15
A7
A8
WE
OE
RAS
LCAS
HCA
S
C1 (D
GND)
(A0
A9)
1
6
20
21
35
40
GND
GND
GNDVCC
VCC
VCC
VOB
TR
PHI1
(AGND)
C3
C4
C5
C6
C7
C2
TP
4
79
78
77
76
75
74
73
3
57
1
2
4
6
96
58
59
60
91
CP2
CP1
RS
PHI2
PHI1
TR2
TR1
CMODE
OSR
OSG
VBANDGAP
VREFLO
VREFMID
LAMPR
LAMPG
LAMPB
VREFHI
TEST
OSB(AGND)
REN
GEN
MA+
MA
-
MB+
MB
-
BEN
+5VD R
9
U2
C27
C28
C29
C31
(DGND)
RA4
1 2 3 4
8 7 6 5
10
1112
13
A A B B
94
93
95
SENSE
A
SENSE
B
SENSE
GND
64
63
PSENSE#1
PSENSE#2
65
66
67
70
71
72
MISC
I/O
#1
MISC
I/O
#2
MISC
I/O
#3
MISC
I/O
#4
MISC
I/O
#5
MISC
I/O
#6
84
83
D+
D-
51
50
SCL
SDA
90
85
80
54
55
RESET
BP
ACTIVE/SUSPENDED
EXT
CLK/CRYST
AL
24/48
52
53
CRYSTALOUT
CRYSTAL
IN
SENA
SENB
HPSEN
SCANSW
MISC2
D+
D-
MISC4
MISC5
MISC6
(MOTOR
GND)
+5VD R
21
R14
+5VD R
17
R19
R15
TP9
TP
C35
R91
R90
R10
TP7 T
P
(DGND)
TP3
TP8
Y1
TP10
+5VD
FB1
5 6 1 2 3
748
SDA
SCL
A0
A1
A2
VCC
GND
WP
C8
(DGND)
(DGND)
R12D
R11
(DGND)
92
89
88
NC
NC
NC
98
87
81
69
61
57
44
31
17
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
43
30
16
VDRAM
VDRAM
VDRAM
97
86
68
62
56
VD
VD
VDVD
VD
82VREG
100
8
AGND
AGND
99
9
VA
VA
+5VD C
18
C17
C16
C15
C14
C11
C10
C9
C21+
5VD
VREG
C20
C19
C91
V
A
(AGND)
NS
-USB
NC
NC
NC
NC
R18
V. MAIN PCB CIRCUIT DIAGRAM (CanoScan N1220U)
(1/3)
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APPENDIX
A - 8 COPYRIGHT 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
+5VD
MISC4
MISC5
U1
1 2 3 4
8 7 6 5
BE
C
VPI
Q2
R31
S1
G1
S2
G2
D1
D1
D2
D2
HPSEN