SERVICE MANUAL
Contents
1. m anov eee ao qu s DEG s obtolobiol 60 120 ansa 020 de 160 tee 14 N il 6 4 SEI VA N lil Do ds ZE BBE Eb E B LU 1 PERE 855 55555 5 88 ss ESE 0 66 Eee SY E51 NITVISAHO ZH 100 VISAHO as E solve T E sono ve 5 TI O30N348nS BALL OV Gv Ov da a mb W M vas 708 Ke ansa o seo eu su ei m asn sn W W di 9 sh di EE q Z asNasa 3 gt REES ya H SSNBSd t Leu ano HOLOW a vi e ONO asas E FE 8 35N28 Sr Ouer VN3S v 3SN3S a T IN F f SE z P m Vv s oY o 555 506 2 A 3 55 g ss 0982 332299 4 b vu von 4150 von 1825828 A 1 a bo M L MH ML 3 anda en 1 189 629 829 1220 Wa eH 5 m H gt Q aoe ans ed zoj 90 SI v anov m lt NE 9 A lt D BOA sm IEI H Z rdi gt CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON COPYRIGHT 2000 CANON INC APPENDIX 2 3 5VD HH 5 E R 9 8 2 Hu 8 9 d H alle g D a x H s 3 e 8 x A i 8 i BoNN D v l2. Host computer Control program Start button O SI Home position sensor USB Connector PCB J2 Drive motor Main PCB ji M1 Buffer RAM J2 Contact image SES Gate array cst Figure 2 2 Q4 2 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON C Main PCB mput and Output To host computer USB connector PCB CS1 Contact image sensor COPYRIGHT 2000 CANON INC CHAPTER 2 Main PCB Drive motor drive signal Drive motor Q4 home HPSEN H when scanning unit is in home position position GND sensor S1 Start SCANSW L when start button was pressed button GND Figure 2 3 CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 3 CHAPTER 2 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 Y Sets gate array Sets analog povver Y Checks PCB ID Checks CIS Y Tests gate array read write Gate array read write was tested normally Sets error flag Scanning unit is in home position
3. Returns scanning unit YES Scanning unit returned to the home position Returned more than 300 mm Sets error flag lt Stops scanning unit lt Figure 2 4 1 2 4 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 Moves scanning unit forvvard by x pulses Scanning unit is off the home position Sets error flag Returns scanning unit by x pulses Adjusts LED ON period for white mark area detection LED ON period NO was adjusted normally Sets error flag Detects white mark area White mark area NO was detected normally Sets error flag LED OFF Standby Figure 2 4 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 5 CHAPTER 2 VVhen the scanner is povvered ON it performs hardvvare 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
4. 2 18 A Ooutline 2 11 IV CONTROL SYSTEM 2 20 B Document Scanning Sequence A Oluutline 2 20 2 12 B Outline of USB 2 21 C Contact Image Sensor 2 13 V POWER SUPPLY 2 23 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 I BASIC OPERATION A Functions The scanner functions are divided into the three main blocks of optical system image processing system and control system Contact image sensor CET Host computer Drive motor Optical system Control system Image processing system Figure 2 1 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 1 CHAPTER 2 B Outline of Electrical System Figure 2 2 shovvs 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 J1
5. 3 5 A USB Connector PCE 3 11 B Drive VVire 3 8 B Flat Cable 3 13 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 III PERIODICAL SERVICING 4 1 SEENEN 4 1 TV SPECLAL TOOLS 4 1 II CONSUMABLE PARTS DURABILITY V SOLVENTS AND LUBRICANTS 4 1 m D 4 1 CHAPTER 5 TROUBLESHOOTING I INTRODUCTION Cocc00000000000000000000 5 1 III LOCATION OF ELECTRICAL PARTS A Initial Check Si lt lt Lionel 5 4 Others b s 5 1 IV CANON SCANNER TEST 5 5 II TROUBLESHOOTING 5 2 A Qutline suisiss sseiese 5 5 CHAPTER 6 PARTS CATALOG FIGURE U01 ACCESSORY 6 2 FIGURE U11 N656U 6 6 FIGURE U10 N650U 6 4 FIGURE U20 N1220U 6 8 APPENDIX CanoScan N650U 656U A 1 DIAGRAM CanoScan N650U N656U II GENERAL CIRCUIT DIAGRAM 0 000000000000000000000000000000000000000000 A 6 CanoScan N1220U A 2 V MAIN PCB CIRCUIT DIAGRAM III MAIN PCB CIRCUIT DIAGRAM CanoScan N1220U OLI A 7 CanoScan N650U N656U A 3 VI USB CONNECTOR PCB CIRCUIT DIAGRAM CanoScan N1220U A 10 COPYRIGHT 2000 CANON INC CANOSCAN N650
6. L 50 4 o 8 a 5 E l o 20 828 ssi H gl 00 IS wi T ols ei s J L 2 el 2 b q g 1 LA S s m o da Bo 8 Um al l lt HPSEN ES A o 5 6 s 4 5 5 dle alej 8 8 k 3 9589 25 g j b xi 5 g a LEZS 3 42 35255 22 m m 8 8 d 1 4 a A g a 4 8 2 B s HH 5888 593 x 55588 A 3 HH SA il Al ze d 5 e si Zo G a Zz 2 z 2 sis s A 8 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON APPENDIX 3 3 m m 8 A A R54 ony B B R57 AA ES 1 d sads Tore T re 55552 55552 88006 88886 A E Broca 5 BEE 4 222 g EH ERAR Ai h wa R41 MB MB R53 Ri R23 R32 MISC6 SENA GE H gt 8 8 w 8 9 E 5 2 z 8 T 8 w 3 8 8 B 2 5 g 8 s 5 5 5 8 5 o SG sl S Ne F a 5 L l 2 2 COPYRIGHT
7. 1 2 B Installation 1 6 III EXTERIOR FEATURES 1 4 C Connecting to the Host Computer A Front Vievv 1 47 tue 1 7 B Rear Vievv 1 4 D Scanning a Document 1 8 IV INSTALLATION 1 5 V CUSTOMER S DAILY MAINTENANCE ELE RL CP LEPE AI TT 1 9 CHAPTER 2 OPERATION AND TIMING I BASIC OPERATION 2 1 D Drive Motor Control Circuit A Functions 221 unese 2 16 B Outline of Electrical System 2 2 III IMAGE PROCESSING SYSTEM 2 17 C Main PCB Input and Output 2 3 A Outline 2 17 D Basic Sequences 2 4 B Image Processing Functions II OPTICAL SYSTEM 2 11 X 2 18 A Ooutline 2 11 IV CONTROL SYSTEM 2 20 B Document Scanning Sequence A Ouutline 2 20 Wee OE 2 12 B Outline of USB 2 21 C Contact Image Sensor 2 13 V POWER SUPPLY 2 23 I EXTERNALS 3 1 III OPTICAL SYSTEM 3 9 A Ceoovers 3 1 A Contact Image Sensor 3 9 II DRIVE SYSTEHM 3 5 IV ELECTRICAL SYSTEM 3 11 A Drive Unit
8. CanoScan N12200U A 2 V MAIN PCB CIRCUIT DIAGRAM III MAIN PCB CIRCUIT DIAGRAM CanoScan N1220U A 7 CanoScan N650U N656U A 3 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 APPENDIX I GENERAL CIRCUIT DIAGRAM CanoScan N650U N656U god 10198UU09 asn ONE q SNA INN NS 8 Ass Z aNd 9 019 17 ano E AS 8 ON I er Josuas oBewu 98109 RUE OI 1010 9AUG zr Lelelely 2222 8 NI 2 E s v L iz TE 90SIW Ti uong veis JOSU9S UOIJISOJ 9UOH O H IS vo god YEN N o 10 N LS9 A 1 CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON COPYRIGHT 2000 CANON INC APPENDIX II GENERAL CIRCUIT DLAGRAM CanoScan N1220U USB Connector PCB 8 OC a gt Si 8 vd 2 dd X A d 2 O vd S o a 5 fi 8 c o o AL EA o a o E r 8 u a 3980 77052 rel XxxosBss n nomo
9. Faulty main PCB Replace the drive unit 3 Drive motor not running Cause 1 Corrective action Cause 2 Corrective action Cause 3 Corrective action Faulty connection of the connector J2 Securely connect the connector J2 Faulty drive motor Replace the drive unit Faulty main PCB Replace the drive unit 4 LED of the contact image sensor not lighting Cause 1 Corrective action Cause 2 Corrective action COPYRIGHT 2000 CANON INC Faulty connection of the connector Securely connect the flat cable Faulty contact image sensor Replace the contact image sensor CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 3 CHAPTER 5 III LOCATION OF ELECTRICAL PARTS USB Connector PCB 2 Main PCB 3 Contact Image Sensor 4 Home Position Sensor 5 Start Button 6 Drive Motor Figure 5 1 5 4 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 5 IV CANON SCANNER TEST A Outline Canon Scanner Test is utility software to check if faulty scanner operation is due to hardware or communication with a host computer VVindovvs 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 Com
10. 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 Black mark area Document glass rear side White mark area 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 2 6 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 2 Calibration sequence Standby Corrects black level Black level vvas corrected normally NO Sets error flag Obtains 32 lines of data Data was obtained normally NO Sets error flag Composes black calibration data Sets black calibration data to gate array Black calibration data was set to gate array normally Sets error flag Figure 2 6 1 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED
11. 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 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 7 CHAPTER 5 2 Scanner Information Select Scanner Information from the Function menu to display as shown in Figure 5 3 VVindovvs or Figure 5 4 Macintosh Canon Scanner Test USB Function E HelpiH s r Scanner Information Vendor ID z CANON Product ID 14 128356 CanoScan H122810 ROH Version 1 06 Figure 5 3 Scanner Information Vendor ID CANON Product ID IX 120356 ROM Yersion 0 75 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 5 8 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 5 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 Scanner self test EN Execute scanner seli test Do not set a docummt It takes about 1 minutes Cancel Figure 5 5 Execute scanner self test Do not set a document It takes
12. color A4 1200 dpi 149 sec grayscale A4 1200 dpi 16 sec preview USB 1 1 B plug x 1 Temperature range 5 to 35 C Humidity range 10 to 90 Air pressure range 613 to 1013 hPa 2 5W during operation 256 0 W x 372 5 D x 34 0 H mm 1 4 kg Specifications are subject to change with product improvement COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 1 3 CHAPTER 1 III EXTERIOR FEATURES A Front View Document Cover Document Glass Alignment Mark 4 Start Button 5 Carriage Lock Figure 1 1 B Rear View USB Port Figure 1 2 1 4 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 1 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 th
13. 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON A 9 APPENDIX VI USB CONNECTOR PCB CIRCUIT DIAGRAM CanoScan N1220U He 5 4 45 t 2 1 ci ca i pi Joe m 1 les 2 o TR e 4 GND A 1 0 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON REVISION 0 JUNE 2000 Prepared by NEVV BUSINESS TECHNICAL SUPPORT DEPT NEW BUSINESS QUALITY ASSURANCE DIV QUALITY ENGINEERING CENTER CANON INC 30 2 Shimomaruko 3 Chome Ohta ku Tokyo 146 8501 Japan Canon PRINTED IN JAPAN IMPRIME AU JAPON 0600M10 04 1 CANON INC
14. Chapter 1 General Descriptions Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Appendix Features specifications exterior features installation customer s daily maintenance Operation and Timing Basic operation optical system image processing system control system power supply Mechanical System Externals drive system optical system electrical system Maintenance and Servicing Periodical replacement parts consumable parts durability periodical servicing special tools solvents and lubricants Troubleshooting Introduction troubleshooting location of electrical parts canon scanner test Parts Catalog 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 CHAPTER 1 GENERAL DESCRIPTIONS I FEATURES 1 1 A Preface 1 5 II SPECIFICATIONS
15. D Document Glass Unit Figure 3 5 Note Take care not to smear the rear side of the document glass unit especially the spacer sliding surface 3 4 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 3 II DRIVE SYSTEM A Drive Unit 1 Removing the drive unit 1 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 D Wire Stopper Seal Figure 3 6 Note Do not damage or lose the seal to reuse it COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 3 5 CHAPTER 3 4 Remove tvvo spacers on both ends of the contact image sensor D Spacer Figure 3 7 5 Lift the drive unit end part then remove the drive wire from the gear 6 Move the drive unit to the center then disconnect the connector J3 0 Connector J3 Figure 3 8 7 Remove the contact image sensor refer to III A 1 8 Lift the drive unit to remove it 3 6 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 3 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 I
16. to 127 node and hub in total 2 Limited up to 6 layers 3 USB cable must be 5 meters or shorter Host computer Layer 1 Hub 1 Layer 2 Hub2 Node Node pone Layer 3 Hub 3 Hube Node Layer 4 Hub 4 Node Node ss 2 Layer 5 Hub 5 Node il 2 6 Node Node Figure 2 22 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 21 CHAPTER 2 USB connector has A plug for connecting to upper stream and B plug for connecting to lower stream Figure 2 23 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 Second priority 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 d
17. 000 1 BUTTON FUNCTION 15 004 0393 000 1 USB I F PCB ASSEMBLY i 16 1 084 5509 08P 1 1 SEAL 1000 17 NPN 1 BASE FRAME 18 051 0620 000 1 LOCK CARRIAGE COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 6 7 FIGURE U20 6 8 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON FIGURE R TQ keno PARTNUMBER N l DESCRIPTION SERIAL NUMBER REMARKS U20 01 002 0884 0SP DOCUMENT COVER ASSEMBLY 02 002 0893 0SP 1 PLATEN GLASS ASSEMBLY 03 051 0508 0SP 1 SPACER 04 060 0122 000 1 CONTACT IMAGE SENSOR 05 003 5249 0SP 1 SENSOR DRIVE ASSEMBLY 1040152000 1 CABLE FLAT 12000 07 056 0032 000 1 SPRING 08 104 0151 000 1 CABLE FLAT 8P 09 NPN 1 SLIDING ROD 10 003 5251 0SP 1 WIRE 11 1 051 0506 000 1 HOOK 00020 12 077 0632 000 2 1 SCREVVS 13 054 0231 0SP 1 PLATE BUTTON 14 051 0625 000 1 BUTTON FUNCTION 15 004 0393 000 1 USB I F PCB ASSEMBLY i 16 1 084 5506 05 i 1 SEAL RENE ENNEN 17 NPN 1 BASE FRAME 18 051 061 7 000 1 LOCK CARRIAGE COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 6 9 APPENDIX I GENERAL CIRCUIT DIAGRAM IV USB CONNECTOR PCB CIRCUIT CanoScan N650U 656U A 1 DIAGRAM CanoScan N650U N656U II GENERAL CIRCUIT DIAGRAM VU 00 K eo 000 Ro ss A 6
18. 220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 3 9 CHAPTER 3 8 Remove the sensor cable from the ontact image sonsor then remove the contact image sensor Contact Image Sensor 2 Sensor Cable G Spring Figure 3 13 Note Do not lose the spring under the contact image sensor 3 10 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 3 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 Figure 3 14 4 Disconnect the connector J2 to remove the USB connector PCB Connector J2 Figure 3 15 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 3 11 CHAPTER 3 2 Precautions when attaching the USB connector PCB 1 Make sure to contact the ground of the USB connector PCB with the sliding rod Ground 2 Sliding Rod Figure 3 16 3 12 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 3 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
19. 656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 3 I EXTERNALS When cleaning checking or repairing inside the scanner remove the necessary covers using the following procedures A Covers 0 Document Cover 2 Document Glass Unit 3 Base Frame Figure 3 1 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 3 1 CHAPTER 3 1 Removing the document cover 1 Pull the hinge unit of the document cover to the left remove the right hinge unit then warp he document cover to remove 0 Document Cover 2 Hinge Figure 3 2 3 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 3 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 End Hook 2 Document Glass Unit Figure 3 3 Note Do not lift the hook part excessively since it is attached to the document glass with a double sided tape COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 3 3 CHAPTER 3 3 Unhook the hook in the front of the document glass unit then slide the document glass unit backward Front Hook 2 Document Glass Unit Figure 3 4 4 Lift the front of the document glass unit then pull forward to remove it
20. B m a xr tol lo o ll Contact Image Sensor A 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON APPENDIX Zs wm an9a anov eo anoa giopiopig s olrollobiol 69 120 4 020 619 wo 80 EU VA 4 omn canst d s NAN ble lo lo T 8 B BRB 3 BL 355 35353 555 333883388 555 55555 S 88 55 222222222 223 D 22 an 565556565 222 56 Old NI IVISAHO 1NO IWISAHO A 3 07 VI 281 vas 105 ansa a a 460 AISNSN r ewasnasa 7 E NH 59 1 HASNASd 7 3 T 5 izu ano HOLOW Fei ve S 36 ONO 35N35 SA a asnas Dei YNAS Fe VISNYS a Lis EN pi V T mx E EJ HM A v lt ER 7 2 g SEE 5052 Z i g 555 g z 998 4377 99 MIT vu CRE 4150 DoD 2856828 Va EE HMM D IL E ansa en Z 189 760 Bo TRO d rop fu qas ak anav CH ST S
21. CAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 11 CHAPTER 2 B Document Scanning SEQUENCE Sequence STBY HPDET Y Scan command is received Times required s 8 sec Drive motor M1 LED ON signal nterface signal Data 1 8 Scanning unit positi Home position Border between black and white Document scan on area Sequence A4 1200dpi 100 24bit color Figure 2 9 Reverse Purpose Remarks STBY Standby After a power on sequence is completed until the scanner receives a scan command from the host computer To maintain the scanner ready for scan HPDET Home position detection After the scanner received a scan command until the home position is detected If the border detection between black and white is failed the scanning unit stops there and proceeds to the next step To detect the home position and a border between black and white STUP Setup 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 SCFW Scanning unit forward After the scanning unit starts moving forward until it reaches the starting position of the scan area specified by the host computer To move the scanning unit with a uniform speed to the vertical scanning position specifie
22. CANUSLAN NGSUU NESEU NIZZOU SERVICE MANUAL REVISION 0 Canon JUNE 2000 JY8 1317 00Z COPYRIGHT 2000 CANON INC RCANOSCANNG50U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON COPYRIGHT O 2000 CANON INC Printed in Japan Imprim 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 LIST OF SER AL NUMBER CanoScan N650U CanoScan N656U CanoScan N1220U COPYRIGHT 2000 CANON INC F91 4611 200 F91 4631 200 F91 4641 200 F91 4661 200 F91 4671 200 F91 4681 200 F91 4691 200 F91 4612 200 F91 4622 200 F91 4632 200 F91 4642 200 F91 4662 200 F91 4672 200 F91 4682 200 F91 4692 200 F91 4712 200 F91 4722 200 F91 4732 200 F91 4742 200 F91 4762 200 F91 4772 200 F91 4782 200 F91 4792 200 AZJ000001 CZJ000001 DZJ000001 FZJ000001 LZJ000001 JZJ000001 KZJ000001 AZK000001 MZK000001 CZK000001 DZK000001 FZK000001 LZK000001 JZK000001 KZK000001 AZL000001 MZL000001 CZL000001 DZL000001 FZL000001 LZL000001 JZL000001 KZL000001 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
23. ED IN JAPAN IMPRIME AU JAPON 3 15 CHAPTER 4 MAINTENANCE AND SERVICING L PERIODICAL REPLACEMENT III PERIODICAL SERVICING PARTS 4 1 IV SPECIAL TOOLS II CONSUMABLE PARTS V SOLVENTS AND LUBRICANTS 4 1 DURABILITY 4 1 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 4 I PERIODICAL REPLACEMENT PARTS None II CONSUMABLE PARTS DURABILITY None III PERIODICAL SERVICING None IV SPECLAL TOOLS None V SOLVENTS AND LUBRICANTS Lubricants used for disassembly and assembly of the scanner To be applied to the sliding part between the scanning 1 Grease TKC 0955 unit and sliding rod MOLYKOTE EM 50L Table 4 1 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 4 1 CHAPTER 5 TROUBLESHOOTING I INTRODUCTION 5 1 III LOCATION OF ELECTRICAL PARTS A Initial Check e Se DEE 5 4 B Others 5 1 IV CANON SCANNER TEST 5 5 II TROUBLESHOOTING 5 2 A Outline 5 5 A Troubleshooting Image Defects B How To Use Canon Scanner Test 5 2 n s COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IM
24. I B 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 3 7 CHAPTER 3 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 1 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 3 8 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 3 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 Figure 3 12 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1
25. IN JAPAN IMPRIME AU JAPON CHAPTER 2 Moves scanning unit to white mark area Scanning unit moved to white mark area normally Sets error flag Adiusts LED ON period LED ON NO period was adjusted normally Sets error flag YES lt LED ON Obtains 16 lines of data Data vvas obtained normally NO Sets error flag Composes white calibration data LED OFF Moves scanning unit to the home position Stores white calibration data as a file Standby Figure 2 6 2 2 8 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 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 store
26. KS U10 01 002 0820 0SP DOCUMENT COVER ASSEMBLY 02 002 0821 0SP 1 PLATEN GLASS ASSEMBLY 03 051 0508 0SP 1 SPACER 04 060 0121 000 1 CONTACT IMAGE SENSOR 05 003 5248 0SP 1 SENSOR DRIVE ASSEMBLY 1040152000 1 CABLE FLAT 12P 07 056 0032 000 1 SPRING 08 104 0151 000 1 CABLE FLAT 8P 09 NPN 1 SLIDING ROD 10 003 5250 0SP 1 WIRE 11 1 051 0506 000 1 HOOK h 12 077 0632 000 2 1 SCREVV 13 054 0231 000 1 PLATE BUTTON 14 051 0505 000 1 BUTTON FUNCTION 15 004 0393 000 1 USB I F PCB ASSEMBLY i 16 1 084 5505 05 i 1 SEAL RENE ENNEN 17 NPN 1 BASE FRAME 18 051 0574 000 1 LOCK CARRIAGE COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 6 5 FIGURE U11 6 6 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON FIGURE R TQ keno PARTNUMBER N l DESCRIPTION SERIAL NUMBER REMARKS U11 01 002 0883 0SP DOCUMENT COVER ASSEMBLY 02 002 0896 0SP 1 PLATEN GLASS ASSEMBLY 03 051 0508 0SP 1 SPACER 04 060 0121 000 1 CONTACT IMAGE SENSOR 05 003 5248 0SP 1 SENSOR DRIVE ASSEMBLY 1040152000 1 CABLE FLAT 12P 07 056 0032 000 1 SPRING 08 104 0151 000 1 CABLE FLAT 8P 09 NPN 1 SLIDING ROD 10 003 5252 0SP 1 WIRE 1 11 1 051 0506 000 1 HOOK 12 077 0632 000 2 1 SCREVV 13 054 0231 000 1 PLATE BUTTON 14 051 0505
27. N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 Scan CHAPTER 5 Select Scan from the Function menu to display a dialog as shown in Figure 5 13 VVindovvs or Figure 5 14 Macintosh COPYRIGHT 2000 CANON INC Set a document and click the Scan button Scan count 1 Time Resolution dpi GG 75 150 lt 300 600 1200 Image Handling Read in memory no file f Save to TIFF file Figure 5 13 CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 13 CHAPTER 5 Set a document and click the Scan button Scan count Timeta Resolution 75 300 1200 Image Q Read in memory na file M Save to TIFF file 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
28. PEBO EEEEo 55552 55552 88006 00006 4 VPI vec IN4 IN3 INI IN2 3 5 lt Ade eqs x Le AR 8 24 adl sizi z ss 2 m er R32 MISCE Sap 012 caio E can E BEN CREN Co E R79 4 R85 R86 R87 U12B 7 vec vec ec U12A vcso be COPYRIGHT 2000 CANON INC desch D r o s S l H 5 s ol E CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON APPENDIX IV USB CONNECTOR PCB CIRCUIT DIAGRAM CanoScan N650U N656U A 6 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON APPENDIX A 7
29. PRIME AU JAPON CHAPTER 5 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 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 1 CHAPTER 5 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
30. T avev 44 zo lt 2 SI BOM lt ane o tel L Z gt i le Z e G D o o 9 4 A bl 5 O 4 bl O m O CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON COPYRIGHT 2000 CANON INC APPENDIX ramstnono lE cs Se 1 vols ki 2 3 l S A x 2 E 8 T Es 3 amp o g E d 8 Ee b F t d o k LA bro 8 4 5 So 8 gee ssl z T a 235 z 19 els 4 SS a UI 5 8 L b 3 3 al HH A 8 st Se 8 8 Lli al la Boa gl g RO 8 e a 6 5 4 3 m 2 A pe led AL 8 is ol 8 9509 ng 9 8 PANNE TRES w 2 iw b Il s Ae Ga OD kes 3 38256 8 3 Bo oido N a 8 413 dd HH 5588 55588 HH lol H go s 5 E 2 e Bo 6 a SIS 2 SIS E A 4 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON R23 D3 APPENDIX 3 3 RER agay SATA 10 B B R57 anny d Fda E
31. U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON II III COPYRIGHT 2000 CANON INC CHAPTER 1 GENERAL DESCRIPTIONS FEATURES 1 1 SPECIFICATIONS 1 2 EXTERIOR FEATURES 1 4 A Front View 1 4 B Rear Vievv 1 4 INSTALLATION 1 5 D Scanning a Document 1 8 CUSTOMER S DAILY MAINTENANCE CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 1 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 adapt
32. 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 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 15 CHAPTER 6 PARTS CATALOG FIGURE UO1 ACCESSOR 6 2 FIGURE U11 N656U FIGURE U10 N650U 6 4 FIGURE U20 N1220U COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON Brank Page COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 6 1 FIGURE U01 CESSORY 6 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON FIGURE R Q A amp PART NUMBER T DESCRIPTION SERIAL NUMBER REMARKS KEY NO K Y U01 01 104 0138 0SP CABLE USB 02 002 0827 0SP 1 1 STAND ASSEMBLY 03 003 7204 0SP 1 TAPE COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 6 3 N650U FIGURE U10 CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON COPYRIGHT 2000 CANON INC 6 4 FIGURE R TQ edo PARTNUMBER N l DESCRIPTION SERIAL NUMBER REMAR
33. about 1 minute Figure 5 6 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 9 CHAPTER 5 Click OK to perform Scanner Self Test When it has completed normally a dialog as shown in Figure 5 7 Window or Figure 5 8 Macintosh is displayed lt A Canon Scanner Test USB Function E HelpiH s Scanner self test ss Scanner is normal Figure 5 7 Scanner self test information Scanner is normal Figure 5 8 5 1 0 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 5 4 Calibration Select Calibration from the Function menu to display a dialog as shown in Figure 5 9 VVindovvs or 5 10 Macintosh Calibration Ea Execute calibration Do not open a cover It takes about 1 minutes Cancel Figure 5 9 Execute calibration 1 minute required Do not open the document cover Figure 5 10 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 11 CHAPTER 5 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 Canon Scanner Test USB Function E HelpiH s r Calibration Calibration is normal Figure 5 11 End of Calibration Figure 5 12 5 1 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U
34. ata is sequentially transferred to a free bus This scanner uses control transfer and bulk transfer 2 22 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 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 Host comuter Main PCB Drive motor 5V Gg 7 RS 5 5V step up circuit 5 0V reference voltage Contact image sensor Gate array Analog circuit l Digital circuit Figure 2 24 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 23 CHAPTER 3 MECHANICAL SYSTEM I EXTERNALS A Covers II DRIVE SYSTEM A Drive Unit B Drive Wire COPYRIGHT 2000 CANON INC 3 1 III OPTICAL SYSTEM 3 9 1937390033 ENEE ES 3 1 A Contact Image Sensor 3 9 3 5 IV ELECTRICAL SYSTEM 3 11 2 3 5 A USB Connector PCB 3 11 5 3 8 B Flat Cable 3 13 CANOSCAN N650U N
35. 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 A BI CI DIE F G H gt U o O m TI o E 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 Sampling point Moving direction Scanning unit Figure 2 17 Sampling point SISI NI SI NI NI NI NI NI NI MI d VVVVYVVY gt Moving direction Scanning unit Figure 2 18 2 18 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 VVhen decreasing the resolution the scanning unit moves at a fast speed to read less lines Sampling point 7 gt 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 co
36. d as a file in the host computer For grayscale 600 300 dpi only green data is processed COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 9 CHAPTER 2 3 Document scanning sequence Standby Moves scanning unit to the vertical scan start position Starts document scan Scan cancellation is required All document lines were scanned a LED OFF Returns scanning unit la Scanning unit returned to the home position Stops drive motor Image data was transmitted NO Standby Figure 2 7 2 10 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 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 Sliding rod Contact image sensor lt Drive wire Drive motor Drive pulley Figure 2 8 COPYRIGHT 2000 CANON INC CANOS
37. d by the host computer SCAN Document scan 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 SCRTN Scanning unit return 2 12 COPYRIGHT 2000 CANON INC After the scanning unit starts moving backward until it returns to the home position To return the scanning unit The home position is detected to the home position to ready for the next scan by the home position sensor Table 2 1 CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 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 N Reading position Light conductor section Rod lens array Phototransistor array F
38. e room temperature before unpacking COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 1 5 CHAPTER 1 B mstallation 1 Unlocking the carriage lock The scanner is shipped vvith 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 Carriage Lock Figure 1 4 3 Return the scanner to its standard position Note Always lock the scanning unit during transport 1 6 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 1 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 vvith 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 USB Port 2 USB Cable Figure 1 5 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 1 7 CHAPTER 1 D Scanning a Document 1 Open the document cover 2 Place a documen
39. er COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 1 1 CHAPTER 1 II SPECIFICATIONS H 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 1 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON H CanoScan N1220U MAIN UNIT Type READING UNIT Image sensor Light source Max document size Image output Resolution Scan time INTERFACE Interface OTHERS Operating environment Power consumption Dimensions Weight CHAPTER 1 Flat bed image scanner 10208 pixels contact image sensor LED indirect exposure RGB each A4 or Letter 216 x 297 mm RGB 8 bits per channel input 14 bits 1200 x 2400 dpi 449 sec
40. exceeds above file capacity 5 14 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 5 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
41. f 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 1 Contact 2 A D 3 Resolution 5 Gamma Packi correction 6 Packing To host computer Figure 2 15 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 17 CHAPTER 2 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
42. 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 5 2 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 5 B Troubleshooting Malfunctions 1 Host computer not detecting the scanner Cause 1 Corrective action Cause 2 Corrective action Cause 3 Corrective action Faulty installation of the device driver Uninstall the device driver and reinstall it Faulty connection of the USB cable Securely connect the USB cable to the scanner and host computer Faulty main PCB Replace the drive unit 2 Scanner not operating Cause 1 Corrective action Cause 2 Corrective action Cause 3 Corrective action Cause 4 Corrective action Carriage lock is locked Unlock the carriage lock Faulty connection of the flat cable Securely connect the flat cable to the contact image sensor and main PCB Faulty contact image sensor Replace the contact image sensor
43. ignal 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 7707 s L L l L L LI RLED GLED BLED Image signal i VEL YE Figure 2 13 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 15 CHAPTER 2 D Drive Motor Control Circuit Figure 2 14 shovvs 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 VVhen 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 Host computer Control program sure Main PCB Drive motor Gate array driver Figure 2 14 2 16 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 III IMAGE PROCESSING SYSTEM A Outline Figure 2 15 shows a block diagram of the main functions o
44. igure 2 10 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 13 CHAPTER 2 Figure 2 11 shows a cross sectional view of the contact image sensor Scanning direction Reading position Light conductor 7 ni Reflected light section sAd 11 C Illuminated light Light reflector section io Rod lens array Phototransistor array Light receiver section Figure 2 11 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 SSES Phototransistor Phototransistor Phototransistor Phototransistor Sensor array array array array drive Image SE signal circuit Rod lens array output AAV LED Figure 2 12 2 14 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U BEN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 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 s
45. 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 gate array Host computer A0 7 Buffer K Control signal Figure 2 21 2 20 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 2 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 tree structure has the following conditions 1 Able to connect up
46. patibles 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 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 5 5 CHAPTER 5 2 Functions Canon Scanner Test has the following functions 1 USB Information Vindovvs only Scanner information recognized by VVindovvs 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 Scan Any image is scanned and saved as an image file in the same folder with the Canon Scanner Test 5 6 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 5 3 Functions descriptions 1 USB Information Vindovvs only Select USB Information from the Function menu to display as shown in Figure 5 2 Canon Scanner Test USE Function F Help H x USB Information Vendor Description Canon Inc Device Description z CanoScan H1226U Port Hame z Local Name Canoscan 12281 Figure 5 2
47. rrected 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 Input Buffer RAM 1 for writing Buffer RAM II for reading Output Fixed volume has been written Buffer RAM 1 for reading Output Input Buffer RAM II for writing Figure 2 20 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 2 19 CHAPTER 2 IV CONTROL SYSTEM A Outline The control system consists
48. t on the document glass orienting the image face down and aligning its top edge with the alignment mark Alignment Mark 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 1 8 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 1 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 REN D JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 1 9 CHAPTER 2 OPERATION AND TIMING I BASIC OPERATION 2 1 D Drive Motor Control Circuit A PFunctions Z SNN NR 2 16 B Outline of Electrical System 2 2 III IMAGE PROCESSING SYSTEM 2 17 C Main PCB Input and Output 2 3 A Outline 2 17 D Basic Seguences 2 4 B Image Processing Functions II OPTICAL SYSTEM 2 11 X
49. the scanner unit push the vvire stopper backvvard to remove it from the base frame through the left hole as shovn in Figure 3 6 4 Remove tvvo spacers on both ends of the contact image sensor 5 Lift the drive unit end part then remove the drive vvire 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 Flat Cable 2 Ferrite Core Figure 3 17 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON 3 13 CHAPTER 3 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 Bend Figure 3 18 b Straighten the bent end of the flat cable on the driver unit side and pass it through the ferrite core Figure 3 19 3 14 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINTED IN JAPAN IMPRIME AU JAPON CHAPTER 3 3 Re bend the flat cable as shown in Figure 3 20 and connect it to the connector J3 Figure 3 20 Connector J3 Figure 3 21 COPYRIGHT 2000 CANON INC CANOSCAN N650U N656U N1220U REV 0 JUNE 2000 PRINT
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