Xerox DocuMate 252 Service Manual
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Xerox DocuMate 252 Service Manual

Xerox DocuMate 252 Service Manual

Sheetfed scanner
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Sheetfed Scanner
Service Manual
Version 1.0

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Summary of Contents for Xerox DocuMate 252

  • Page 1 Sheetfed Scanner Service Manual Version 1.0...

  • Page 2: Table Of Contents

    Sheetfed Scanner Contents INTRODUCTION........................... 1-1 ENERAL NOTES FOR SERVICING ....................1-1 ENERAL ESCRIPTION ......................1-2 ASIC PECIFICATIONS ......................1-2 UNPACKING, INSTALLATION, AND TRANSPORTATION..........2-1 RECAUTIONS OF NSTALLATION ....................2-1 NPACKING ROCEDURE ......................2-1 NSTALLATION ......................... 2-3 2.3.1 Installing the ADF Paper Tray................2-3 2.3.2 Installing the ADF Output Paper Tray ..............
  • Page 3 Service Manual 5.4.6 Removing the ADF Pad..................5-11 5.4.7 Removing the Main Control Board ..............5-12 5.4.8 Removing the Motor in Lower Optical Assembly ......... 5-14 5.4.9 Removing the Inverter in the Lower Optical Assembly......5-15 5.4.10 Removing the Lower Optical Chassis............5-16 PARTS..............................

  • Page 4: Introduction

    Service Manual 1. INTRODUCTION 1.1 General Notes for Servicing 1.2 General Description This manual is intended to be used by the maintenance engineers. It describes areas to be maintained, the detailed installation, the disassembly of optional ADF, and the component replacement procedures as well as the main trouble shooting guides.

  • Page 5: General Description

    Sheetfed Scanner General Description The scanner which features small footprint and fast scan rate is the perfect companion at your desktop. The build-in automatic document feeder allows 50 sheets of documents to be scanned continuously at one time and achieves fast scan rate of 25 pages per minute in simplex mode and 50 images per minute in duplex mode.

  • Page 6: Unpacking, Installation, And Transportation

    Service Manual 2. UNPACKING, INSTALLATION, AND TRANSPORTATION 2.1 Precautions of Installation 2.2 Unpacking Procedure 2.3 Installation 2.4 Placing the Original 2.5 Transportation Precautions of Installation Pay attention to the following matters before unpacking and installation. • Do not install in a place where vibration may occur. •...
  • Page 7 Main Unit Input Paper Tray Output Paper Tray USB Cable Power Adapter Power Cord Figure 2.1 Package Contents...

  • Page 8: Installation

    Service Manual Installation 2.3.1 Installing the ADF Paper Tray Attach the ADF Paper Tray to the clip joint of the scanner as indicated below. When properly insert, you will hear a snap-in sound. ADF Input Paper Tray Scanner Clip Joint Figure 2.2 Installing the ADF Paper Tray...

  • Page 9: Installing The Adf Output Paper Tray

    2.3.2 Installing the ADF Output Paper Tray 1. Hold the Output paper tray some 30 degrees as shown in below. 2. Insert the right protrusion of the Output Paper Tray into the hole on the front of the scanner. 3. Insert the left protrusion of the Output Paper Tray slightly into the hole on the front of the scanner.

  • Page 10: Connecting The Cables

    Service Manual 2.3.3 Connecting the Cables Make sure the power of scanner is off. 2.3.3.1 Connecting to Power Plug the small end of the power adaptor into the power jack of your scanner. Insert the other end to an appropriate power outlet. Power Cable Figure 2.4 Installing the Power Cable 2.3.4 Turning on the Power...

  • Page 11: Placing The Original

    Placing the original Document feeding Place your document with the text face down on the ADF Input Paper Tray. Align the two sides of the document with the slide guides. Please note that the ADF Input Paper Tray can hold up to 50-page document at a time. Your Document (Face...

  • Page 12: Theory Of Operation

    Service Manual 3. THEORY OF OPERATION Introduction Main Control Unit Introduction Cold Cold Fluorescent Fluorescent Lamp Analogu Analogue Signa Signal Digital Digital Signa Signal Main Reflecte Boar Reflected Host Board 1 0 0 1 0 0 USB 2.0 Controller Figure 3.1 Theory of Operation The reflected rays of your original as shown in the above Figure 3.1 pass through the lens and create an image on the CCD (Charged Coupled Device).

  • Page 13: System Diagram

    Main control unit 3.2.1 System diagram Figure 3.2 System block diagram...

  • Page 14: Main Control Circuit

    Service Manual 3.2.2 Main control circuit This scanner is controlled by the 80C32. The 80C32 is configured with a 64-KB external ROM program area, a 256-BYTE internal RAM work area, a 64-KB external RAM work area, 2 timer / counters, 4 I/O ports, 2 external interrupts, and 2 internal interrupts for 2 internal timer / counters.

  • Page 15: Video Circuit

    3.2.3 Video circuit: The video circuit of the scanner includes: 1. CCD driving circuit, 2. CCD signal processing circuit. CCD Driving Circuit The CCD driving circuit is used to generate correct signals to the CCD, so that the CCD may generate the correct image data. Signals for CCD: Pin Assignment for CCD cable Name...
  • Page 16 Service Manual 2. CCD signal processing circuit Dout CCD Signal Processor The CCD signal processor includes all the necessary circuitry to perform three- channel conditioning and sampling. The signal chain consists of three-channel correlated double sampling (CDS) and programmable gain adjustment of the CCD output (PGA) is a 16 bit analog to digital connector (ADC) quantizes the analog signal.

  • Page 17: Led And Push Button Module Circuit

    3.2.4 LED and Push Button Module Circuit The circuit for the LED and Push Button modules showes the function of the entire scanner including the Error LED (Red), the Ready LED (Green) and the Push Button. Pin assignment of LED module Pin No.

  • Page 18: Sensor Input

    Service Manual 3.2.5 Sensor input A. Photo_Sensor The sensor input includes paper in/out sensor. Paper In/Out sensor The paper position is detected by photo sensor. The photo transistor transmission to the photo sensor receiver circuit is shown below. Figure 3.3 Paper in/out sensor The paper in/out sensor is detected when the paper passes between the LED and the photo transistor.

  • Page 19: Sub Power Supply Circuit

    3.2.6 Sub power supply circuit The sub power supply circuit is provided for the internal analog circuit. Input is 24V and output is Vcc and +5Va. The circuit configuration is shown below: Switching +24Vdc Regulator +12V +5Va Linear Regulator Linear +24Vdc +12V Regulator...

  • Page 20: Power Supply

    Service Manual 3.2.7 Power supply In this system, there is only one type of power supply. Please see Table 3.1 for details. Table 3.1 The Power Adapter Type Wall-mount Characteristic Input voltage range 100-240V Input current (at the 2A type or less rated input/output) Input frequency 50-60Hz...

  • Page 21: Problem Solving

    Service Manual 4. PROBLEM SOLVING Diagnostics Troubleshooting This chapter supplies two paths for dealing with operational problems. The first relies on the scanner’s internal diagnostics. The second uses troubleshooting flowcharts and tables to isolate the problem. In many cases, the internal diagnostics will help you to locate the source of the problem quickly.

  • Page 22: Offline Diagnostics

    4.1.2 Offline diagnostics To run the offline diagnostics, and turn the power back on. When you first turn the scanner back on, the READY light will blink, indicating that the diagnostics are in progress. Observe the front panel Error LED closely. In a short time, the Error LED indicates the results of the offline diagnostics as explained in the table below.

  • Page 23: Diagnostic Flowcharts

    Service Manual 4.1.3 Diagnostic flowcharts Use the flowcharts that follow to determine the exact problem when either the online or offline diagnostics indicate a group error. Refer to Chapter 4 for parts replacement. 4.1.3.1 Group 1 error flowchart (CCFL assembly) This flowchart applies when the Error LED shows number 7 and 8.
  • Page 24 4.1.3.2 Group 2 error flowchart (paper in ADF paper tray) This flowchart applies when the Ready LED is off and Error LED shows number 9 with the scanner online, and there is paper in the ADF paper tray. Group 2 error Open cover and then remove the papers from ADF’s input paper tray,...
  • Page 25 Service Manual 4.1.3.3 Group 3 error flowchart (no paper in ADF paper tray) This flowchart applies when the Ready LED is off and Error LED shows number 6 with the scanner online, and there is no paper in the ADF paper tray. Group 3 Error Open cover, then close the cover...

  • Page 26: Troubleshooting

    Troubleshooting Refer first to the applicable troubleshooting flowchart in the following three sections. The flowcharts refer you to the appropriate table for detailed troubleshooting. 4.2.1 Flowcharts This section provides the following troubleshooting flowcharts: • Troubleshooting from power on to scanner ready •...
  • Page 27 Service Manual 4.2.1.1 Troubleshooting flowchart: power on to scanner ready. Troubleshooting From Power on Power See Table 4.3 LED on Cover open test IR sensor test DRAM Test Face down SDRAM test Face up SDRAM test Face down light check Face up light check Warming-up Check (Green LED Blinking)
  • Page 28 4.2.1.2 Troubleshooting flowchart: online ADF operation Online Troubleshooting (ADF mode) Frequent See Table 4.9 Paper Jam? Frequent See Table 4.10 double feed Large skew See Table 4.10 volume? Large jitter See Table 4.6 Reading See Table 4.7 position deviation? Image See Table 4.8 unclear Strange...

  • Page 29: Tables

    Service Manual 4.2.2 Tables The tables in this section provide detailed troubleshooting information. 4.2.2.1 The Power LED does not go on Cause Relevant Unit Check Method Maintenance Method Unplugged from None Visual check Insert the AC outlet plug into the outlet.
  • Page 30 4.2.2.2 Reading is not performed Cause Relevant Check Maintenance Unit Method Method ADF cover open ADF cover Visual check Close the ADF cover. Table 4.4 4.2.2.3 Image does not appear Cause Relevant Check Maintenance Unit Method Method ADF cover ADF cover Visual check Close the ADF open...
  • Page 31 Service Manual 4.2.2.4 Large jitter Cause Relevant Check Method Maintenance Unit Method Power supply- None Visual check Connect the main control connector. board connection failure Power supply fails Power Tester check Replace the power supply (+24V, GND) supply. Motor-main None Visual check Connect the control PCBA...
  • Page 32 4.2.2.5 Reading position deviation Cause Relevant Unit Check Method Maintenance Method Power supply- None Visual check Connect the main control connector. board connection failure Power supply Power supply Tester check Replace the fails (+24V, GND) power supply. Motor- main None Visual check Connect the control PCBA...
  • Page 33 Service Manual 4.2.2.6 Image unclear Cause Relevant Unit Check Method Maintenance Remar Method Lamp too dark Lamp Visual check Replace with a None new lamp. Dirt on calibration Calibration Visual check Clean the glass None reference plate reference plate with isopropyl alcohol.
  • Page 34 4.2.2.8 Frequent double feed and skew Cause Relevant Check Maintenance Unit Method Method Paper setting Operation Is the paper Teach users to failure error correctly set in properly position the the paper paper chute? Paper failure Operation Is the None error specified paper used...

  • Page 35: Disassembly

    Service Manual 5. DISASSEMBLY Service Tools Lubricants Procedure for Disassembly and Reassembly Service Tool Table 5.1 describes the maintenance tools necessary for the maintenance of this equipment. Name Description Minus screwdriver Idler pulley module screw Philips screwdriver Nominal No.2 M3, M4 (magnetic) Shell “Terrace Oil 46”...

  • Page 36: Cleaning The Adf

    Cleaning the ADF From time to time the pad assembly and feeding rollers may become contaminated with ink, toner particles or paper dust. In this case the scanner may not feed documents smoothly. If this occurs please follow the cleaning procedures to return your machine to its original state.

  • Page 37: Cleaning The Calibration Area

    Service Manual Cleaning the Calibration Area Press the Paper Jam Clearing button. Open the front door to the left. Wet a cotton swab with some isopropyl alcohol. (95%) Wipe the glass and the white area as illustrated in below by moving the swab from side to side to rid the dust or dirt.

  • Page 38: Procedure For Disassembly And Reassembly

    Procedure for disassembly and reassembly 5.4.1 Notes on disassembly Clean the disassembly and assembly location. Disconnect the power cable and remove the AC plug from the outlet before disassembly and assembly. Follow the disassembly and assembly procedures. Never loosen the screws of parts that must not be disassembled.

  • Page 39: Removing The Upper Housing

    Service Manual 5.4.2 Removing the Upper Housing Hold the Output Paper Tray and push your finger inwardly to remove the Output Paper Tray. Hold the Input Paper Tray and lift the Tray to remove it. Press the ADF release button to open the cover. Remove 2 fixing screws.
  • Page 40 Remove 4 fixing screws Remove the upper housing...

  • Page 41: Removing The Upper Optical Assembly

    Service Manual 5.4.3 Removing the Upper Optical Assembly Press the Paper Jam Release Button to open the cover. Loosen 2 fixing screws on the upper case. Remove the fixing sponge. Loosen 2 fixing screws on the left side. Loosen 1 fixing screw on the right side. Paper Jam Fixing Screw x 2 Released Button...
  • Page 42 Disconnect the inverter cable with red and black colors. Disconnect the lamp inverter cable (in white color) to remove the inverter. Fixing Screw x 1 Inverter Cable Power cable Inverter...

  • Page 43: Removing The Upper Optical Chassis

    Service Manual 5.4.4 Removing the Upper Optical Chassis Remove the inverter in the upper optical assembly. (See preceding section 5.3.3) Disconnect two cables on the optical chassis. Cables Optical Chassis CCD Board Note: During assembling or disassembling procedure, please pay special attention not to touch the CCD board on the optical chassis.

  • Page 44: Removing The Lamp In Upper Optical Assembly

    5.4.5 Removing the Lamp in Upper Optical Assembly Remove the upper optical chassis. (See preceding section 5.3.4) Loosen two fixing screws on the lamp cover. Use a flat screwdriver to loosen the lamp assembly. Gently remove the lamp assembly. Flat screwdriver Fixing Screw x 2 Lamp assembly 5-10...

  • Page 45: Removing The Adf Pad

    Service Manual 5.4.6 Removing the ADF Pad Use your fingers to press two sides of the ADF pad and lift the pad on the upper optical assembly to remove it. ADF Pad 5-11...

  • Page 46: Removing The Main Control Board

    5.4.7 Removing the Main Control Board Unscrew 1 fixing screw on the right side. Unscrew 2 fixing screws on the left side and close the cover. Raise the main unit and disconnect the motor cable and flat cable. Unscrew all fixing screw. Disconnect all cables.
  • Page 47 Service Manual Power cable 2 Fixing screw 2 fixing screw Remove 4 fixing screw and disconnect the power cable The main board 5-13...

  • Page 48: Removing The Motor In Lower Optical Assembly

    5.4.8 Removing the Motor in Lower Optical Assembly 1. Turn the scanner over. 2. Remove 2 fixing screws on the external side of the metal plate. 3. Remove the motor. Remove 2 fixing screws The motor 5-14...

  • Page 49: Removing The Inverter In The Lower Optical Assembly

    Service Manual 5.4.9 Removing the Inverter in the Lower Optical Assembly 1. Cut the cable bondage. 2. Remove the inverter from the plastic fixing plate. 3. Disconnect the inverter cable. Inverter The inverter cable Release the inverter from the plastic plate and disconnect the inverter cable The inverter 5-15...

  • Page 50: Removing The Lower Optical Chassis

    5.4.10 Removing the Lower Optical Chassis Remove 2 fixing screws on the left and external side of the metal plate. Remove 2 fixing screws on the right and internal side of the metal plate. Remove the Optical Chassis. Remove 2 fixing screws on the left external side Remove 2 fixing screws on the right internal side Optical Chassis 5-16...
  • Page 51 Service Manual 5.4.11 Removing the Lamp in the Lower Optical Assembly 1. Remove 2 fixing screws on the lamp assembly. 2. Remove the lamp. Remove 2 fixing screws on the lamp assembly The lamp assembly 5-17...

  • Page 52: Parts

    Service Manual 6. PARTS 6.1 Spare Part Diagram/Table Spare part diagram...
  • Page 54 Service Manual...
  • Page 55 Xerox DocuMate 252 Spare Parts List: XEROX DocuMate 252 SERVICE PARTS TABLE VISIONEER P/N DESCRIPTION 65-0247-000 OPTICAL, LOWER, W/LAMP 65-0295-000 ASS'Y, LOWER OPTICAL: FOR FACE-DOWN 65-0296-000 ASS'Y, LAMP MOUNT, FACE DOWN 65-0248-000 INVERTER 65-0249-000 ROLLER, FEED, PAPER IN 65-0250-000 ASS'Y, MOTOR...
  • Page 56 Xerox DocuMate 262 Spare Parts List: XEROX DocuMate 262 GREEN SERVICE PARTS TABLE VISIONEER P/N DESCRIPTION 65-0372-000 S-PARTS: ASS'Y, PAPER GUIDE, UPPER W/O LAMP, RoHS 65-0322-000 S-PARTS: PCBA: LBA69, RoHS S-PARTS: CABLE: 2/2 HOUSING, 14P+6P, P=2.0mm, L=420mm, 28AWG,聯 穎, W/TUBE, W/CORE, RoHS 65-0299-000 S-PARTS: CABLE: 2 HOUSING, 12P/12P, P=2.0mm, L=420mm, 28AWG,...
  • Page 57 65-0256-000 S-PARTS: HOUSING, BOTTOM, ABS, 2.5t,337x168x100, SILVER, RoHS S-PARTS: ASS'Y, POWER S/W: GF037RA-090,驊 陞, 5P, P=2.5mm, 65-0359-000 L=50mm, W/TUBE, RoHS 57-0105-000 S-PARTS: ASS'Y, PAPER OUTPUT TRAY ACCESSORIES S-PARTS: ADAPTER:DESK-TOP,IEC 320-C6,3P,100~240Vac,4Vdc, 2A,48W,HEG42-240200-7L(A)LF, HITRON(海昌),CLASS I, ENER, RoHS 65-0094-000 65-0413-000 S/W PACKAGE,RoHS S-PARTS: USB CABLE: USB A(M)/B(M), 4P, L=1850mm, UL2725 28AWG, SV-0411016, 昇文, COLOR:透明, W/CORE, RoHS 65-0365-000 S-PARTS: AC POWER CORD, EUR.(CEE), 2P+G.
  • Page 58 Xerox DocuMate 272 Spare Parts List: XEROX DocuMate 272 GREEN SERVICE PARTS TABLE VISIONEER DESCRIPTION 65-0320-000 S-PARTS: ASS'Y, PAPER GUIDE, UPPER, W/O LAMP (002-3087-0), RoHS 65-0322-000 S-PARTS: PCBA: LBA69, RoHS 65-0299-000 S-PARTS: CABLE: 2/2 HOUSING, 14P+6P, P=2.0mm, L=420mm, 28AWG,聯 65-0324-000...
  • Page 59 65-0362-000 S-PARTS: PCBA, SBA53, BACK-SENSOR, RoHS ACCESSORIES 65-0094-000 S-PARTS: ADAPTER: DESK-TOP, IEC 320-C6, 3P 100-240VAC, HITRON 65-0364-000 S/W PACKAGE, RoHS 65-0365-000 S-PARTS: USB CABLE:USB A(M)/B(M),4P,L=1850mm,UL2725 28AWG,SV- 65-0182-000 S-PARTS: AC POWER CORD, EUR.(CEE), 2P+G. 65-0097-000 S-PARTS: AC POWER CORD:US,3P,10A/125V,L=1800mm,3C*18AWG,BLK 65-0183-000 S-PARTS: AC POWER CORD UK 65-0369-000 FOAM, EPS, L:310x278x160,發泡倍率:62.5,白色, RoHS 65-0370-000...

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