1. Manuals
  2. Brands
  3. Ricoh Manuals
  4. Scanner
  5. Aficio IS420
  6. Service manual

Ricoh Aficio IS420 Service Manual

Image scanner
Hide thumbs Also See for Aficio IS420:
Table of Contents

Advertisement

Quick Links

Download this manual
IMAGE SCANNER IS420
[HS-1P]
SERVICE MANUAL
Ricoh Co., Ltd.
October 1995

Advertisement

Table of Contents
loading

Related Manuals for Ricoh Aficio IS420

Summary of Contents for Ricoh Aficio IS420

  • Page 1 IMAGE SCANNER IS420 [HS-1P] SERVICE MANUAL Ricoh Co., Ltd. October 1995...
  • Page 2 i. Important Information This equipment has been tested and found to comply with the limits for a Class A digital de- vice, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial envi- ronment.
  • Page 3 IMPORTANT SAFETY NOTICES PREVENTION OF PHYSICAL INJURY 1. Before disassembling or assembling parts of the copier and peripherals, make sure that the copier power cord is unplugged. 2. The wall outlet should be near the copier and easily accessible. 3. Note that some components of the copier and the paper tray unit are supplied with electrical voltage even if the main switch is turned off.
  • Page 4 4. When keeping used lithium batteries in order to dispose of them later, do not put more than 100 batteries per sealed box. Storing larger numbers or not sealing them apart may lead to chemical reactions and heat build-up. LASER SAFETY The Center for Devices and Radiological Health (CDRH) prohibits the repair of laser-based optical units in the field.
  • Page 5 Information in this document is subject to change without notice and does not represent a commitment on the part of Ricoh Co., Ltd. © 1993 Ricoh Co., Ltd. All rights reserved. Printed in Japan. © 1993 Pixel Translations, Inc. All rights reserved...
  • Page 6 October 9th, 1995 OVERALL MACHINE INFORMATION SPECIFICATIONS 1. OVERALL MACHINE INFORMATION 1.1. SPECIFICATIONS Scanning method: Flat-bed and ADF Book scan: Horizontal: Max. 297 mm [11.7 ins] Vertical: Max. 432 mm [17.0 ins] ADF: Document size: - Width: 69~297 mm [2.7~11.7 ins] - Length: 120~432 mm [4.7~17.0 ins] all pages in a document must be the same width...
  • Page 7 OVERALL MACHINE INFORMATION October 9th, 1995 COMPONENT LAYOUT 1.2. COMPONENT LAYOUT 1.2.1. Front View g404v501.wmf Name Function Platen cover Covers the document and serves as a neutral background for documents placed on the main exposure glass. ADF exposure cover Covers the scanner and closes the ADF exposure cover interlock switch.
  • Page 8 October 9th, 1995 OVERALL MACHINE INFORMATION COMPONENT LAYOUT 1.2.2. Rear View g404v502.wmf Name Function Expansion board slot Used to install an expansion board. SCSI connectors For connecting the SCSI cables. SCSI ID rotary switch Used to select the SCSI ID and to select diagnostic tests.
  • Page 9 OVERALL MACHINE INFORMATION October 9th, 1995 COMPONENT LAYOUT 1.2.3. ADF g404v503.wmf Name Function Automatically feeds multi-page documents into the scanner. ADF cover Open this cover to remove paper jammed at the input side. Document table Documents to be scanned using the ADF are placed here.
  • Page 10 October 9th, 1995 OVERALL MACHINE INFORMATION DRIVE LAYOUT 1.3. DRIVE LAYOUT 1.3.1. Scanner g404v504.wmf Name Function Second carriage Moves to keep the distance between the xenon lamp and the CCD constant, and sends light reflected from the 1st carriage to the CCD. First carriage Moves the xenon lamp along the document and sends the light reflected from the document to the 2nd...
  • Page 11 OVERALL MACHINE INFORMATION October 9th, 1995 DRIVE LAYOUT 1.3.2. ADF g404v505.wmf Name Function Feed roller Feeds the top page of the original into the ADF. Separation roller Stops the lower page of the original while allowing the top one to pass. Pick-up roller Picks up and transports the top page of the original placed on the document table.
  • Page 12 October 9th, 1995 OVERALL MACHINE INFORMATION ELECTRICAL COMPONENT LAYOUT 1.4. ELECTRICAL COMPONENT LAYOUT 1.4.1. Scanner g404v506.wmf Name Function Home position sensor Detects whether the first carriage is at the home position. This provides +24 V, ±5 V, and +12 V dc to the MBU. Xenon lamp This illuminates the document.
  • Page 13 OVERALL MACHINE INFORMATION October 9th, 1995 ELECTRICAL COMPONENT LAYOUT 1.4.2. ADF g404v507.wmf Name Function Paper feed motor This drives the pick-up and feed rollers. Document sensor Detects when a document is placed on the document table. Feed out sensor Detects when a document is at the feed-out position. This contains the ADF indicator lamps.
  • Page 14 October 9th, 1995 OVERALL MACHINE INFORMATION ELECTRICAL COMPONENT LAYOUT 1.4.3. Options 23, 24 g404v510.wmf Name Function This optional board speeds up the video interface. This is an optional board for compressing the scanned image data. This optional board carries out image processing functions.
  • Page 15 OVERALL MACHINE INFORMATION October 9th, 1995 OPTICAL LAYOUT 1.5. OPTICAL LAYOUT g404v508.wmf Name Function Exposure glass Any document to be scanned in book mode is placed here. Reflector Reflects the light from the xenon lamp onto the document. 1st mirror Reflects light from the document to the second mirror.
  • Page 16 October 9th, 1995 OVERALL MACHINE INFORMATION CONTROL SYSTEM OUTLINE 1.6. CONTROL SYSTEM OUTLINE g404v509.wmf Name Full Name Function Scanner Control Unit This contains the scanner control cpu, the RAM, the ROM, and the SCSI controller. Mother Board Unit This contains a timing signal generator for the CCD basic drive clock.
  • Page 17 OVERALL MACHINE INFORMATION October 9th, 1995 CONTROL SYSTEM OUTLINE Name Full Name Function Options Video Interface Unit This optional board speeds up the video interface. Data Compression Unit This is an optional board for compressing the scanned image data by methods known as MH, MR, and MMR.
  • Page 18 October 9th, 1995 OVERALL MACHINE INFORMATION POWER DISTRIBUTION 1.7. POWER DISTRIBUTION AC Power Main SW +12V Read SN AC Switching LED 2 Circuit +24V ADU LED 4 +24V +24V +24V +24V +12V +12V - 5V LED 3 +24V +24V +24V +12V LED 1 Cooling Fan Motor...
  • Page 19 October 9th, 1995 DETAILED SECTION DESCRIPTIONS INITIALIZATION 2. DETAILED SECTION DESCRIPTIONS 2.1. INITIALIZATION Power on User Level: System error Is the memory OK? Service Level: Memory error Initialize the SIP3, SCSI, and SBC Is the ADF exposure cover closed? ADF exposure cover open error Initialize the SIP3 Turn on the lamp Do CH1 and...
  • Page 20 DETAILED SECTION DESCRIPTIONS October 9th, 1995 INITIALIZATION Is the minimum level more than the Shading error specified value? Is the origin position Origin positioning error Does CH4 of the D/A converter initialize Shading error correctly? Were there Has the any shading, lamp, or origin initialization procedure been tried position errors? three times?
  • Page 21 October 9th, 1995 DETAILED SECTION DESCRIPTIONS INITIALIZATION During power-up initialization, the scanner performs the following steps (refer to the flow chart on the previous page). 1. Checks the ROM checksum and makes a RAM read/write check. 2. Presets the main scan timing of the SIP3 (gate array for image processing), and initializes the SCSI controller and the SBC (Scan Buffer Controller).
  • Page 22 DETAILED SECTION DESCRIPTIONS October 9th, 1995 INITIALIZATION 15. Checks the signals from the feed, read, and feed-out sensors. If any of them are on, the CPU determines that there is a paper jam. 16. Checks the document sensor signal. If a document is detected on the document table, check #17 is not performed.
  • Page 23 October 9th, 1995 DETAILED SECTION DESCRIPTIONS SCANNER PROCESS 2.2. SCANNER PROCESS 2.2.1. Book Mode View from the right side of the machine [B]: Home Position [C]: Book Mode Home Position Standard Position Sensor G404D509.wmf Basic Scanning Procedure When the scan command is received from the host computer, the scanner starts scanning as explained in the following steps.
  • Page 24 DETAILED SECTION DESCRIPTIONS October 9th, 1995 SCANNER PROCESS The scanner starts to scan the image area at the desginated position. The scanner stops after scanning the desginated image area. g404d511.wmf The lens focuses the image from the scanned original onto the CCD through the 1st, 2nd, and 3rd mirrors.
  • Page 25 October 9th, 1995 DETAILED SECTION DESCRIPTIONS SCANNER PROCESS Optional Steps 1. Size Detection If selected, this is done after Initialization. 1-1. Main Scan Direction (Document Width) The first carriage moves to the book mode standard position ([C] in the diagram at the start of section 2.2.1). Then, the scanner scans 5 mm from the book mode standard position.
  • Page 26 DETAILED SECTION DESCRIPTIONS October 9th, 1995 SCANNER PROCESS 2. Read Size Command, Auto Size Mode If selected, this is done after Initialization. 2-1. Read Size Command If the scanner receives the Read Size Command in book mode, it detects the size in the main scan direction as described above.
  • Page 27 October 9th, 1995 DETAILED SECTION DESCRIPTIONS SCANNER PROCESS 2.2.2. ADF Mode G404D508.wmf Basic Scanning Procedure When the scanner receives the ADF scanning command, the scanner scans the original as described below. 1. Initialization - ADF Mode - The scanner performs the home position check and the shading process. If a home position error, ADF cover open, or memory error is detected, the carriages [B] will stop.
  • Page 28 DETAILED SECTION DESCRIPTIONS October 9th, 1995 SCANNER PROCESS 2. Document Table Lift G404D510.pcx The lift mechanism consists of the document table lift clutch [A], the lift shaft [B], the document table position sensor [C], and the sensor actuator on the gear [D].
  • Page 29 October 9th, 1995 DETAILED SECTION DESCRIPTIONS SCANNER PROCESS g404d532.wmf When the first original is being fed, the bend in the lift shaft is pointing up, and the spring is at maximum compression. As sheets of the document are scanned, the spring pushes the document table upwards so that the top of the stack is always against the pick-up roller.
  • Page 30 DETAILED SECTION DESCRIPTIONS October 9th, 1995 SCANNER PROCESS 3. Original Feed and Separation g404d531.wmf To feed the original, the paper feed motor and the paper transport motor (which drives the paper transport drum) turn on. The paper feed motor drives the pick-up roller [A] through a train of gears and the pick-up clutch [B].
  • Page 31 October 9th, 1995 DETAILED SECTION DESCRIPTIONS SCANNER PROCESS Optional Steps 1. Size Detection G404D508.wmf If selected, this is done after document table lift/paper feed 1-1. Main Scan Direction (Document Width) First of all, the original is fed to the scan ready position between the read sensor [B] and the size detection position [C].
  • Page 32 DETAILED SECTION DESCRIPTIONS October 9th, 1995 SCANNER PROCESS 1-2. Sub Scan Direction (Document Length) The length of the original is calculated by counting the motor pulses while the feed sensor [A] is on. (The length is detected during scanning.) 2. Read Size Command, Auto Size Mode If selected, this is done after document table lift/paper feed 2-1.
  • Page 33 October 9th, 1995 DETAILED SECTION DESCRIPTIONS PAPER MISFEED DETECTION 2.3. PAPER MISFEED DETECTION G404D500.wmf t 1 (s) t 2 (s) t 3 (s) t 4 (s) t 5 (s) t 6 (s) t 7 (s) 200 dpi Within Within 0.33 0.29 1.24~ 0.26...
  • Page 34 DETAILED SECTION DESCRIPTIONS October 9th, 1995 PAPER MISFEED DETECTION J1: The leading edge of the original does not reach the feed sensor within 3 s (binary picture processing) or 9 s (grayscale processing) after the document table has been lifted up. J2: The leading edge of the original does not reach the read sensor within the time required for feeding the distance between the feed sensor and the read sensor + 30 mm.
  • Page 35 October 9th, 1995 DETAILED SECTION DESCRIPTIONS VIDEO DATA PATH 2.4. VIDEO DATA PATH Even pixel data Odd pixel data Sample Hold Sample Hold Multiplexer White peak data Gain Control White Level A/D Converter Selection Shading Correction Gamma Correction Size/Skew Detection Auto Dynamic Photo/Line...
  • Page 36 DETAILED SECTION DESCRIPTIONS October 9th, 1995 VIDEO DATA PATH 1. CCD The CCD converts the light reflected from the original into an analog signal. The CCD contains a row of 5,000 pixels at a resolution of 400 dpi (15.7 lines/mm). The CCD has two output lines, for odd and even pixels.
  • Page 37 October 9th, 1995 DETAILED SECTION DESCRIPTIONS VIDEO DATA PATH 8. Size/Skew Detection Size Detection: This is explained in the Scanner Process section. Skew Detection (ADF mode only): The machine notes the pixel location across the main scan that data first appears. The machine determines whether the original is skewed by looking at the data either side of this point on subsequent main scans.
  • Page 38 DETAILED SECTION DESCRIPTIONS October 9th, 1995 PCBs AND THEIR FUNCTIONS 2.5. PCBs AND THEIR FUNCTIONS 2.5.1. SBU (Sensor Board Unit) Sample hold converter Gain Multiplexer control Ref. Sample hold White level selection Relative Absolute G404D505.wmf The light reflected from the document is picked up by the CCD (Charge Coupled Device) and converted into an electrical signal.
  • Page 39 October 9th, 1995 DETAILED SECTION DESCRIPTIONS PCBs AND THEIR FUNCTIONS 2.5.2. MBU (Mother Board Unit) Timing signal generator Video data Electrical components +24V, +12V, ±5V G404D504.wmf The MBU passes signals between boards and generates the timing clocks for the CCD. The MBU has four LEDs (LED1~LED4) on the dc power lines.
  • Page 40 DETAILED SECTION DESCRIPTIONS October 9th, 1995 PCBs AND THEIR FUNCTIONS 2.5.3. SCU (Scanner Control Unit) DCU or VIU SCSI SCSI controller SRAM SIP3 FIFO CPU BUS EEPROM Enhanced EPROM SRAM DRAM Dip SW Rotary SW Push SW Image data G404D506.wmf The image data from the SBU goes to the SCU through the MBU.
  • Page 41 October 9th, 1995 DETAILED SECTION DESCRIPTIONS PCBs AND THEIR FUNCTIONS 2.5.4. SDU (Scanner Drive Unit) Motor signal Scanner Drive circuit motor +24 VSDU Xenon Inverter circuit lamp Lamp control signal G404D507.wmf The SDU contains the drive circuits for the scanner drive motor and the xenon lamp.
  • Page 42 DETAILED SECTION DESCRIPTIONS October 9th, 1995 PCBs AND THEIR FUNCTIONS 2.5.5. ADU (ADF Drive Unit) Pick-up clutch Feed out sensor Document table Driver Read sensor lift clutch Feed sensor Document sensor Document table Motor Paper transport position sensor driver motor Motor Paper feed driver...
  • Page 43 October 9th, 1995 INSTALLATION ENVIRONMENT 3. INSTALLATION 3.1. ENVIRONMENT Please observe the following precautions in order to ensure safe operation of the scanner and to realize its full performance. • Do not use the scanner in any location that is exposed to direct sunlight. •...
  • Page 44 INSTALLATION October 9th, 1995 INSTALLATION PROCEDURES 3.2. INSTALLATION PROCEDURES Please refer to the operator’s manual for details. 3.2.1. Before Connecting the Power Cables The PSU (Power Supply Unit) automatically recognizes the input voltage. • Input voltage: 100 to 120 / 220 to 240 V ac •...
  • Page 45 October 9th, 1995 SERVICE LEVEL FUNCTIONS DIP SWITCH SETTINGS 4. SERVICE LEVEL FUNCTIONS 4.1. DIP SWITCH SETTINGS The factory default position of the dip switches is indicated in the diagram below. After changing a dip switch setting, either switch the power off and then on again, or press the reset switch.
  • Page 46 SERVICE LEVEL FUNCTIONS October 9th, 1995 DIP SWITCH SETTINGS Dip Switch Item Contents Component test Each component can be tested; refer to mode Table B later in this section. DIP Switch 1 must be OFF. Sensor test mode Each sensor can be tested; refer to Table C later in this section.
  • Page 47 October 9th, 1995 SERVICE LEVEL FUNCTIONS DIP SWITCH SETTINGS Table A: Demonstration Mode Rotary Contents Switch No. 200 dpi scan in book mode 400 dpi scan in book mode 200 dpi scan in ADF mode * 400 dpi scan in ADF mode * 200 dpi scan in ADF mode * 400 dpi scan in ADF mode * ADF free run *...

  • Page 48: Table Of Contents

    SERVICE LEVEL FUNCTIONS October 9th, 1995 DIP SWITCH SETTINGS Table C: Sensor Test Mode Rotary Contents Switch No. Document Sensor Feed Sensor Read Sensor Feed Out Senor ADF Exposure Cover Interlock Switch Platen Cover Interlock Switch Home Position Sensor Document Table Position Senor Not used Not used If the selected sensor is on, all LEDs turn on.

  • Page 49: Rotary

    October 9th, 1995 SERVICE LEVEL FUNCTIONS DIP SWITCH SETTINGS Table E: Counter Indication Mode Rotary Switch Table LED Indication Table Rotary Scanner LEDs ADF LEDs Counter Switch Contents Value Green Amber Green Amber Not used Units Tens Hundreds Thousands Ten thousands Hundred thousands Millions Not used...
  • Page 50 SERVICE LEVEL FUNCTIONS October 9th, 1995 PCBs 4.2. PCBs LED1 Reset Switch LED2 +5VG DIP Switches SCSI Rotary Switch 1.25A, 250V Do not change the position of this jumper. LED1 +24V LED2 PHSH (base CCD clock) LED3 +12V LED4 F1, F2 5A, 250V VR1 to VR4 See Appendix B: Electrical Adjustments 4.3.
  • Page 51 October 9th, 1995 REMOVAL AND REPLACEMENT COVERS 5. REMOVAL AND REPLACEMENT CAUTION: Before starting disassembly, be sure to turn off the main switch and disconnect the power cord and interface cable(s) for safety. 5.1. COVERS 5.1.1. ADF Upper Cover G404R500.wmf [A]: ADF Upper Cover (2 screws) 5.1.2.
  • Page 52 REMOVAL AND REPLACEMENT October 9th, 1995 COVERS 5.1.3. Left Cover G404R502.wmf [A]: ADF Exposure Cover [B]: Left Cover (2 screws) 5.1.4. Right Cover G404R503.wmf [A]: Right Cover (2 screws)
  • Page 53 October 9th, 1995 REMOVAL AND REPLACEMENT COVERS 5.1.5. Front Cover G404R504.wmf First, remove the left and right covers (see section 5.1.3 and 5.1.4). [A]: Front Cover (2 screws; 1 connector) 5.1.6. Rear Cover G404R505.wmf First, remove the left and right covers (see section 5.1.3 and 5.1.4). [A]: Knob Screw [B]: Rear Cover (2 hooks)
  • Page 54 REMOVAL AND REPLACEMENT October 9th, 1995 ADF AND UPPER SIDE 5.2. ADF AND UPPER SIDE 5.2.1. Paper Transport Unit G404R506.wmf First, remove the ADF Upper Cover (see section 5.1.1), ADF Left Cover, and ADF Right Cover (see section 5.1.2). [A]: Paper Transport Drum [B]: Paper Transport Unit (2 E-rings;...
  • Page 55 October 9th, 1995 REMOVAL AND REPLACEMENT ADF AND UPPER SIDE 5.2.2. Separation Unit G404R507.wmf First, remove the ADF Upper Cover (see section 5.1.1), ADF Left, and ADF Right Covers (see section 5.1.2). [A]: Separation Unit (4 screws; 3 connectors)
  • Page 56 REMOVAL AND REPLACEMENT October 9th, 1995 ADF AND UPPER SIDE 5.2.3. Document Table Assembly G404R509.wmf First, remove the Separation Unit (see section 5.2.2). [A]: Document Table Assembly (3 screws) 5.2.4. Scanning Guide Plate G404R511.wmf First, open the platen cover. [A]: Scanning Guide Plate (2 screws)
  • Page 57 October 9th, 1995 REMOVAL AND REPLACEMENT ADF AND UPPER SIDE 5.2.5. Paper Feed-out Assembly G404R512.wmf First, remove the Document Table Assembly (see section 5.2.3). [A]: Paper Feed-out Assembly (1 stepped screw; 1 connector) [B]: Upper Feed-out Unit [C]: Lower Feed-out Unit...
  • Page 58 REMOVAL AND REPLACEMENT October 9th, 1995 ADF AND UPPER SIDE 5.2.6. Motors G404R513.wmf First, remove the Paper Feed-out Assembly (see section 5.2.5). [A]: Paper Feed Motor (2 screws; 1 harness) [B]: Paper Transport Motor (2 screws; 1 harness) [C]: Motor Cushions [D]: Spring Plates 5.2.7.
  • Page 59 October 9th, 1995 REMOVAL AND REPLACEMENT ADF AND UPPER SIDE 5.2.8. Platen Cover Assembly platencv.wmf First, remove the ADF Left Cover and ADF Right Cover (see section 5.1.2). [A]: Exit Table Extension [B]: Paper Output Guide [C]: Platen Cover (4 screws) [D]: Platen Cover Support Brackets Note: When replacing the platen cover, take out all harnesses routed on the platen cover carefully.
  • Page 60 REMOVAL AND REPLACEMENT October 9th, 1995 LOWER SIDE 5.3. LOWER SIDE 5.3.1. Main Exposure Glass Assembly G404R516.wmf First, remove the Left Cover and Right Cover (see section 5.1.3 and 5.1.4) and Front Cover (see section 5.1.5). [A]: ADF Exposure Cover [B]: Main Exposure Glass Assembly 5-10...
  • Page 61 October 9th, 1995 REMOVAL AND REPLACEMENT LOWER SIDE 5.3.2. Scanner Motor Assembly G404R517.wmf G404R518.wmf First, remove the Main Exposure Glass (see section 5.3.1) and Shield Plate (see sec- tion 5.3.5). [A]: 3 screws to loosen* [B]: Timing Belt [C]: Scanner Motor Assembly (4 screws, 1 connector) Before taking out the motor assembly, loosen the scanner drive wire timing belt.
  • Page 62 REMOVAL AND REPLACEMENT October 9th, 1995 LOWER SIDE 5.3.3. First Carriage Assembly - Removal - G404R526.wmf G404R527.wmf First, remove the Lens Block Assembly (see section 5.3.7). [A]: Upper Unit (6 screws, 2 flat cables) Note: Open the platen cover while removing the upper unit, or the upper unit will be damaged.
  • Page 63 October 9th, 1995 REMOVAL AND REPLACEMENT LOWER SIDE G404R508.wmf G404R528.wmf [D]: Right Shield Plate (3 screws) [E]: Lamp Harness (1 screw, 1 connector) [F]: Reflector [G]: Xenon Lamp [H]: Lamp Holder (1 screw) [I]: Wire Securing Plates (1 screw each) [J]: First Carriage Assembly 5-13...
  • Page 64 REMOVAL AND REPLACEMENT October 9th, 1995 LOWER SIDE - Assembly - G404R536.wmf 1. Slide the first and second carriage to the rear side of the machine. 2. Insert the carriage positioning tools [A] into positioning holes [B] and [C]. 3. Thread the scanner wire through the hooks [D] in the carriage. 4.
  • Page 65 October 9th, 1995 REMOVAL AND REPLACEMENT LOWER SIDE 5.3.4. Second Carriage Assembly - Removal - G404R510.wmf G404R538.wmg First, remove the Main Exposure Glass Assembly (see section 5.3.1). [A]: Upper Unit (6 screws) Note: Open the platen cover while removing the upper unit, or the upper unit will be damaged.
  • Page 66 REMOVAL AND REPLACEMENT October 9th, 1995 LOWER SIDE R404R529.wmf [D]: Tension Spring [E]: Scanner Wires [F]: Second Carriage - Assembly - G404R530.wmf 1. Route the scanner wires as shown above. 5-16...
  • Page 67 October 9th, 1995 REMOVAL AND REPLACEMENT LOWER SIDE G404R531.wmf G404R537.wmf 2. Loosen two allen screws in the pulley [A]. 3. Slide the first and second carriages to the rear of the machine. 4. Insert the carriage positioning tools [B] into positioning holes [C] and [D]. 5.
  • Page 68 REMOVAL AND REPLACEMENT October 9th, 1995 LOWER SIDE 5.3.5. Shield Plates G404R519.wmf Fisrt, remove the main exposure glass (see section 5.3.1). [A]: Front Shield Plate (8 screws) [B]: Rear Shield Plate (5 screws) [C]: Flat Cable 5.3.6. Power Switch Assembly First, remove the main exposure glass (see section 5.3.1).
  • Page 69 October 9th, 1995 REMOVAL AND REPLACEMENT LOWER SIDE 5.3.7. Lens Block Assembly G404R521.wmf First, remove the front shield plate (see section 5.3.5). [A]: Lens Block Assembly (4 screws, 3 flat cables) 5-19...
  • Page 70 REMOVAL AND REPLACEMENT October 9th, 1995 PCBs 5.4. PCBs 5.4.1. SCU Assembly G404R522.wmf [A]: SCU Assembly (2 screws) [B]: Interface Bracket (2 screws) [C]: SCU NOTE: When replacing the SCU, put the old ROM (IC13) on the new SCU. 5.4.2. SDU R404R523.wmf First, remove the front shield plate (see section 5.3.5).
  • Page 71 October 9th, 1995 REMOVAL AND REPLACEMENT PCBs 5.4.3. MBU G404R524.wmf First, remove the lens block assembly (see section 5.3.7) and the SCU assembly (see section 5.4.1.) [A]: MBU (4 screws; 4 connectors; 2 flat cables) 5.4.4. PSU G404r525.wmf First, remove the front shield plate and rear shield plate (see section 5.3.5). [A]: Power Switch Cable [B]: PSU (4 screws;...

  • Page 72: Memory Error

    October 9th, 1995 TROUBLESHOOTING SELF-DIAGNOSTICS 6. TROUBLESHOOTING 6.1. SELF-DIAGNOSTICS The scanner automatically performs a series of self-diagnostic checks each time the power is turned on. If an error is detected, it is displays the type of error using the four LEDs on the scanner and the ADF. See "Detailed Section Descriptions - Initialization"...
  • Page 73 TROUBLESHOOTING October 9th, 1995 CHECK ITEMS 6.2.2. Items Checked During Operation The following items are checked during operation. They are not checked in stand-by mode except for "ADF exposure cover open" and "Document feeder cover open". 1. Paper jam Is there a paper misfeed? 2.

  • Page 74: Scanner Leds Amber Green Amber -- Blinking

    October 9th, 1995 TROUBLESHOOTING ERROR INDICATION 6.3. ERROR INDICATION If the self diagnostics find an error, the error is displayed by a combination of the four LEDs on the Scanner and the ADF. If the dip switches on the rear of the machine are set up for normal operation, the error is indicated roughly for users.
  • Page 75 TROUBLESHOOTING October 9th, 1995 TROUBLESHOOTING PROCEDURES 6.4. TROUBLESHOOTING PROCEDURES There are two types of troubleshooting procedure. • For user-visible error conditions that the user could not clear up • For technician level error conditions 6.4.1. User-visible Error Conditions 1. Lamp Cover Open (ADF exposure cover interlock switch open) Symptom: The error remains even if the ADF exposure cover is closed properly.
  • Page 76 October 9th, 1995 TROUBLESHOOTING TROUBLESHOOTING PROCEDURES 2. Lamp Error Symptom: The problem cannot be solved with the procedures in the user’s manual. Possible Cause: • A mirror is out of position. • Misalignment. • SCU damaged. • SBU damaged. • SDU damaged.
  • Page 77 TROUBLESHOOTING October 9th, 1995 TROUBLESHOOTING PROCEDURES 3. Document Feeder Cover Open (Platen cover interlock switch open) Symptom: The problem cannot be solved with the procedures in the user’s manual. Possible Causes: • The platen cover interlock switch is damaged. • The harness between the platen cover interlock switch and the SCU is damaged.
  • Page 78 October 9th, 1995 TROUBLESHOOTING TROUBLESHOOTING PROCEDURES 4. Paper Jam Symptom: The problem cannot be solved with the procedures in the user’s manual. Possible Causes: • The separation unit is damaged. • The paper transport drum ass’y is damaged. • The paper feed-out unit is damaged. •...
  • Page 79 TROUBLESHOOTING October 9th, 1995 TROUBLESHOOTING PROCEDURES Did the jam occur at the paper transport drum ass’y? Replace the paper feed-out ass’y. Replace the paper transport drum ass’y. 5. Paper Misfeed Symptom: The problem cannot be solved with the procedures in the user’s manual. Possible Causes: •...
  • Page 80 October 9th, 1995 TROUBLESHOOTING TROUBLESHOOTING PROCEDURES 6. Document Table Error Symptom: The problem cannot be solved with the procedures in the user’s manual. Possible Causes: • The document table position sensor is broken. • The document table clutch is broken. •...
  • Page 81 TROUBLESHOOTING October 9th, 1995 TROUBLESHOOTING PROCEDURES 6.4.2. Service Call Errors (System Errors) If a system error occurs, the following errors can be detected with the self-diagnostics using the dip switches. See page 4-2. 1. Memory Error Symptom: This error occurs in the following conditions. •...
  • Page 82 October 9th, 1995 TROUBLESHOOTING TROUBLESHOOTING PROCEDURES 5. Shading Error Symptoms: A shading error occurs when one of the following conditions occurs. • The difference in black level based on CH1 of the DAC setting between even and odd pixels is not within ± 1. The black level based on CH2 of the DAC setting is not within 3 ±...
  • Page 83 TROUBLESHOOTING October 9th, 1995 TROUBLESHOOTING PROCEDURES 6. Home Position Error Symptom: This error is detected when the home position sensor cannot detect the first carriage. Possible Causes: • The scanner motor is damaged. • The harness between the scanner motor and the SDU is damaged. •...
  • Page 84 October 9th, 1995 TROUBLESHOOTING INDICATION WHEN A CONNECTOR IS OUT OF POSITION 6.5. INDICATION WHEN A CONNECTOR IS OUT OF POSITION 6.5.1. Scanner AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA...

  • Page 85: Blinking Blinking

    TROUBLESHOOTING October 9th, 1995 INDICATION WHEN A CONNECTOR IS OUT OF POSITION 6.5.2. ADF Document Pick-up clutch table position sensor Document table lift clutch AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA...
  • Page 86 October 9th, 1995 APPENDIX A. OPTICAL ADJUSTMENT (MECHANICAL) Tools A. OPTICAL ADJUSTMENT (MECHANICAL) When adjusting the scanner, do the optical adjustments first, then the electrical adjustments (Appendix B). A.1. Tools These adjustments require the following special tools. 1) Oscilloscope 2) Resolution chart (test chart): P/N A0129110 3) Optical adjustment harness (jig harness): P/N G4049002 4) Optical adjustment glass (jig glass): P/N G4049001 A.2.
  • Page 87 APPENDIX A. OPTICAL ADJUSTMENT (MECHANICAL) October 9th, 1995 Adjustment A.3. Adjustment A.3.1. Preparation G404X514.wmf G404X516.wmf 1. Remove the ADF exposure glass and the main exposure glass. 2. Remove the top shield plate. 3. Connect the optical adjustment harness [A] to CN11 on the MBU board. 4.
  • Page 88 October 9th, 1995 APPENDIX A. OPTICAL ADJUSTMENT (MECHANICAL) Adjustment A.3.2. White Level Adjustment G404X501.wmf 1. Move the carriage to where the white part of the resolution chart is in position for reading. 2. Connect the probes of the oscilloscope as shown above. CN1: V CN2: T Time: 0.1 ms...
  • Page 89 APPENDIX A. OPTICAL ADJUSTMENT (MECHANICAL) October 9th, 1995 Adjustment A.3.3. MTF Adjustment G404X515.wmf G404X503.wmf V: 1 V T: 0.1 ms G404X509.wmf 1. Move the carriage so that the 200 dpi chart [A] affixed to the resolution chart is in the read position. 2.
  • Page 90 October 9th, 1995 APPENDIX A. OPTICAL ADJUSTMENT (MECHANICAL) Adjustment A.3.4. Magnification Adjustment V: 1 V G404X510.wmf G404X504.wmf T: 0.1 ms 1. Loosen the two optical block retaining screws, then move the optical block back and forth to where the number of waveform intersections displayed is reduced to six or less.
  • Page 91 APPENDIX A. OPTICAL ADJUSTMENT (MECHANICAL) October 9th, 1995 Adjustment A.3.5. Horizontal Scanning Starting Position Adjustment V: 0.5 V T: 5 µs 12.8 ± 2.5 µs G404X511.wmf G404X505.wmf 1. Move the carriage so that the black dot on the ADF exposure glass is in the read position.
  • Page 92 October 9th, 1995 APPENDIX A. OPTICAL ADJUSTMENT (MECHANICAL) Adjustment A.3.6. Scan Line Adjustment G404X515.wmf G404X512.wmf G404X508.wmf V: 1 V T: 0.1 ms 1. Move the carriage so that the thin white line pattern [A] on the resolution chart is in the read position. The CCD detects the white line pattern when the output becomes as shown to the above left.
  • Page 93 October 9th, 1995 APPENDIX B. OPTICAL ADJUSTMENT (ELECTRICAL) B. OPTICAL ADJUSTMENT (ELECTRICAL) B.1. General This procedure adjusts the electrical characteristics of the SBU. The SBU mechanical adjustments (MTF, scan line, etc.) must be performed before this procedure. The scanner firmware includes the functions for these adjustments.
  • Page 94 APPENDIX B. OPTICAL ADJUSTMENT (ELECTRICAL) October 9th, 1995 B.2.2. Software • Terminal (One of the Windows Accessories) B.3. Adjustments • GCA (Gain Control Amplifier) Gain Curve This adjusts the GCA amplification ratio. The GCA on the SBU amplifies analog image data. •...
  • Page 95 October 9th, 1995 APPENDIX B. OPTICAL ADJUSTMENT (ELECTRICAL) 2. If the user shipped the machhine to the warehouse with a VIU installed, remove it and replace it with the warehouse’s VIU. The jumper and switch settings of the warehouse VIU must be as follows. •...
  • Page 96 APPENDIX B. OPTICAL ADJUSTMENT (ELECTRICAL) October 9th, 1995 B.4.2. Adjustment The following pages describe the adjustment procedures, along with the prompts that appear on the screen. After finishing the adjustments, turn off the scanner, and reassemble the scanner. 1. Type =, then press Enter. Usage:[= command]) [ = ] is the SBU volume ajustment command.
  • Page 97 October 9th, 1995 APPENDIX B. OPTICAL ADJUSTMENT (ELECTRICAL) 7. The bottom line of the screen shows data coming from the scanner. This data is continually being refreshed. You can begin to adjust immediately. Adjust VR4 on the SBU until the value of X is within the required range. (In the example screen above, the value on the bottom line below the X must be 220 +/- 2.) Then input !.
  • Page 98 APPENDIX B. OPTICAL ADJUSTMENT (ELECTRICAL) October 9th, 1995 12. Press the Enter key. <<<< AGC=20 >>>> Be sure : [X]== 121 +/- 10 **** Image Data (#3584) **** [ Exit : ’!’ key ] 003,003,125,124 (122,119 <+>003) [120] Ave-(O:121,E:118 <+>003) [119] 13.
  • Page 99 October 9th, 1995 APPENDIX B. OPTICAL ADJUSTMENT (ELECTRICAL) 18. Move the 1st carriage to the white chart position. Then press the Enter key. <<<< AGC=27 >>>> <<<< Absolute white level (W1) >>>> Ajust VR3 : <W0X> == 0 +/- 3 **** Image Data (#3684) **** [ Exit : ’!’...
  • Page 100 APPENDIX B. OPTICAL ADJUSTMENT (ELECTRICAL) October 9th, 1995 24. Make sure that the 1st carriage is at the white chart position. Then press the Enter key. <<<< AGC=27 >>>> <<<< Relative white level (W0) >>>> Ajust VR1 : [X] == 218 +/- 3 **** Image Data (#3584) **** [ Exit : ’!’...
  • Page 101 October 9th, 1995 DCU (DATA COMPRESSION UNIT) OVERVIEW C. DCU (DATA COMPRESSION UNIT) C.1. OVERVIEW The DCU receives scanned images in binary video data form from the image processor (SIP3) on the SCU board and compresses the data using MH, MR, or MMR, whichever is selected.
  • Page 102 October 9th, 1995 IEU (IMAGE ENHANCEMENT UNIT) OVERVIEW D. IEU (IMAGE ENHANCEMENT UNIT) D.1. OVERVIEW The IEU processes Photo/Text separation and Binary conversion automatically. • Automatic Photo/Text Separation: To improve image reproduction of Photo/Text documents, text and photo areas are distinguished automatically and the appropriate image processing is done on them.
  • Page 103 IEU (IMAGE ENHANCEMENT UNIT) October 9th, 1995 BLOCK DIAGRAM 3. GTB (Gamma Translation Block) The GTB does the following: gamma conversion using an internal 256 byte SRAM, grayscale conversion of multi-value video data (8-bit to 6-bit), and transmission of multi-value video data to the IPB. 4.
  • Page 104 October 9th, 1995 VIU (VIDEO INTERFACE UNIT) OVERVIEW E. VIU (VIDEO INTERFACE UNIT) E.1. OVERVIEW This card speeds up the video interface between the scanner and the host computer. Control I/F Video I/F Host Computer Scanner G404O502.WMF There are two connectors from the VIU to the host computer. •...
  • Page 105 VIU (VIDEO INTERFACE UNIT) October 9th, 1995 SCANNER CONTROL INTERFACE E.2. SCANNER CONTROL INTERFACE E.2.1. Specifications Communication method: EIA RS-232C equivalent Transmission Method: Half duplex transmission Synchronization Method: Start-stop transmission Data Length: 8 bits Stop Bit: 1 bit Parity Check: Odd parity Data Rate (bps): 2400, 4800, 9600, 19200...
  • Page 106 October 9th, 1995 VIU (VIDEO INTERFACE UNIT) VIDEO INTERFACE E.3. VIDEO INTERFACE E.3.1. Signal Description /HGATE /VGATE Host Video I/F /FAIL G404O504.WMF VCL: Video data sampling clock (scanner to host) /HGATE: Gate signal for the main scan direction (host to scanner) /VGATE: Gate signal for the sub-scan direction (scanner to host) Video data (0: Black)
  • Page 107 VIU (VIDEO INTERFACE UNIT) October 9th, 1995 SWITCHES AND JUMPERS E.4. SWITCHES AND JUMPERS There are three switches on the VIU; two are DIP switches and one is a DIC switch. E.4.1. DIP Switch 1 Switch Type: 2-bit DIP Switch Function: Data Transfer Speed Setting Settings 4,800 bps (Default)

This manual is also suitable for:

Hs-1p

Table of Contents