LUMISCAN ACR-2000 SERVICE MANUAL LUMISYS P/N 0070-715
LUMISCAN ACR-2000 SERVICE MANUAL P/N 0070-715, Rev 02 JANUARY, 2000
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LUMISCAN ACR-2000 SERVICE MANUAL - INTRODUCTION ___________________________________________________________________ FOREWORD ___________________________________________________________________ LUMISCAN ACR-2000 SERVICE MANUAL P/N 0070-715 Rev 02 Proprietary Notice and Disclaimer The information herein disclosed is the property of Lumisys.
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LUMISCAN ACR-2000 SERVICE MANUAL - INTRODUCTION TABLE OF CONTENTS _______________________________________________________________________________ INTRODUCTION Overview......................................................................................................................................... v Reference Documents .................................................................................................................... vi Safety Information..............................................
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LUMISCAN ACR-2000 SERVICE MANUAL - INTRODUCTION INTRODUCTION _____________________________________________________________________ OVERVIEW Product Features The LUMISCAN ACR-2000 is a precision instrument designed to scan storage phosphor screens and produce high quality x-ray images over a wide dynamic range with a high signal-to noise ratio. This is accomplished by illuminating the screen with a laser as the screen is moved perpendicular to the laser.
LUMISCAN ACR-2000 SERVICE MANUAL - INTRODUCTION REFERENCE DOCUMENTS LUMISCAN ACR-2000 Reader and Eraser Operator’s Reference Guide P/N 0070-711 LUMISCAN ACR-2000 Service Manual P/N 0070-715 LUMISCAN LSDT Film Digitizer / ACR-2000 Reader Configuration Guide P/N 0071-434 vi
LUMISCAN ACR-2000 SERVICE MANUAL - INTRODUCTION SAFETY INFORMATION Conventions DANGER A DANGER indicates that personal injury may occur if the user does not perform the procedure correctly. CAUTION A CAUTION indicates that damage to the product may occur if the user does not perform the procedure correctly. PRECAUTION A PRECAUTION indicates that inconvenience to the user, such as loss of data, may occur if the user does not perform the procedure correctly.
LUMISCAN ACR-2000 SERVICE MANUAL - INTRODUCTION FIGURE I-1 LABLES Figure I-2 Label Locations viii
LUMISCAN ACR-2000 SERVICE MANUAL - INTRODUCTION Electrical Hazards WARNING THIS EQUIPMENT IS OPERATED WITH HAZARDOUS VOLTAGES WHICH CAN SHOCK, BURN OR CAUSE DEATH. This equipment must be serviced by persons properly trained and certified by Lumisys. DO NOT operate the LUMISCAN ACR-2000 with a damaged power cord. Use of an extension cord is not recommended. This equipment must be properly grounded and power connections inspected to insure safe operation.
LUMISCAN ACR-2000 SERVICE MANUAL - INTRODUCTION LUMISCAN ACR-2000 SYSTEM SPECIFICATIONS SCAN SIZE 18 x 24 to 35 x 43 cm PIXELS PER LINE 2048 10" to 14" SCAN RATE 50 lines/second GREY SCALE RESOLUTION 12 bits (4096 levels) INTERFACE ISA Interface Card With 16 Mbytes Memory DIMENSIONS 20.5"W x 13"H x 27"D POWER REQUIREMENTS 100 to 120V, 50/60 Hz, 1.5 Amps 220 to 240V, 50/60 Hz, 1.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 1.0 PRE-INSTALLATION ___________________________________________________________________ 1.0 PRE-INSTALLATION _____________________________________________________________________ 1.1 Purpose The purpose of this section is to provide the necessary information to efficiently configure a site for the LUMISCAN ACR-2000 pre-installation. This includes environmental, electrical, and physical parameters. 1.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 1.0 PRE-INSTALLATION Flooring should be tile and linoleum only. Carpeting or rugs should not be in the room. 1.4 Physical requirements The LUMISCAN ACR-2000 weighs over 75 pounds. It is important the system is placed on a table or stand that can provide adequate and level support. 1.5 Connectivity The room needs to have a 10 Base T network connection.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.0 INSTALLATION ___________________________________________________________________ 2.0 LUMISCAN ACR-2000 INSTALLATION ___________________________________________________________________ 2.1 Unpacking Instructions NOTE INSTALLATION SHOULD NOT BE ATTEMPTED UNLESS THE SERVICE ENGINER HAS BEEN FACTORY TRAINED WARNING THE LUMISCAN ACR-2000 READER WEIGHS OVER 75 POUNDS. IT REQUIRES TWO PEOPLE TO SAFELY LIFT AND MOVE IT.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.0 INSTALLATION LUMISCAN ACR-2000 READER. With TWO PEOPLE, lift the LUMISCAN ACR-2000 READER off the pallet. To install the LUMISCAN ACR-2000 READER, follow the Hardware Installation Procedures. 2.2 Hardware Installation 2.2.1 Tools Required #1 flat-head screwdriver #1 philips-head screwdriver 2.2.2 AC Voltage You must verify that the LUMISCAN ACR-2000 READER is set up for the correct AC line voltage.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.0 INSTALLATION 2.2.4 Media Support Assembly Fasten the Media Support Assembly to the top of the Front Enclosure. 2.2.5 Screen Exit Assembly Place the Screen Exit Tray in the brackets on the bottom of the Front Enclosure. 2.2.6 Installation of Data Control Board (DCB) The ACR-2000 Reader is controlled by a proprietary Lumisys Data Control Board in an IBM type PC. The DCB is 8 bit ISA. The DCB uses three resources, IRQ, Mem Seg Addr, and Base I/O Addr.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.0 INSTALLATION 2.2.8 Installation of the ACR-2000 Eraser Remove the ACR-2000 Eraser from its container. The ACR-2000 Eraser provides the means to return an exposed phosphor plate to its ground state and ready for the next patients exam. The eraser can be mounted on the wall by following the separate and included instructions or can be placed on a desktop near an AC outlet. 2.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.0 INSTALLATION NOTE If, when the driver loads, no CLUT/CAL files are found or multiple CLUT/CAL files are found in the root , the driver will default to a 1:1 Correction LUT and no CAL LUT and it will audibly beep. The device driver LSDTVxxx.COM (where Vxxx is the version number) must be loaded by the user for the software to work. To load the driver the user should add the command "lsdtvxxx" to the AUTOEXEC.BAT or from the MS-DOS command line type "LSDTVxxx".
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.0 INSTALLATION Copy the CLUT file (CLTXXXXX.DAT) from the floppy distribution disk into the directory, ‘\SystemRoot\system32\drivers’. Use the “LSDT for Windows NT Control Panel” (see below) to enter this filename into the LSDT section of the Registry. Copy the CAL LUT (CALXXXXX.DAT) from the floppy distribution disk into the directory, ‘\SystemRoot\system32\drivers’.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.0 INSTALLATION 2.3.5 Software Installation Tips Windows NT driver disk 2.00 and later 1. It is necessary to have a “Density Correction Lookup Table” installed to achieve accurate density tracking. This file is located on the installation floppy disk. The file format is “CLTXXXXX.DAT” where XXXXX is the serial number of the Reader. This file is installed in the “C:\SystemRoot\SYSTEM32\DRIVERS” directory.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 2.0 INSTALLATION 4. The Digital Control Board uses three resources that need to be free. These are Segment Address, IRQ, and Base I/O Address. One, two, or all of these resources can be changed if necessary. These settings are hardware selectable on the DCB. 5. The LSDT Control Panel needs to match the DCB resource hardware settings. The default resources are Segment Address D000, IRQ 5, and Base I/O 100.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 3.0 SYSTEM OPERATION _________________________________________________________________ 3.0 SYSTEM OPERATION _________________________________________________________________ 3.1 Power-Up The power switch on the LUMISCAN ACR-2000 READER is located in the lower left corner of the right side panel of the scanner. Two LEDs, one above the other, are located in the lower right corner of the front panel.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 3.0 SYSTEM OPERATION 3.2 Plate Handling and Loading Processed Phosphor Plates that are to be scanned should be handled carefully to avoid introducing scratches, fingerprints and/or static. The physical process by which storage phosphors work does not change or, “wear out”, over time. Consequently, the lifetime of the storage phosphor screens is dependent on how carefully they are handled.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 3.0 SYSTEM OPERATION Handle plates with powder-free latex gloves. Clean plates every day or after every 10 scans. Use Anhydrous Ethyl Alcohol applied with laboratory grade lint free paper towels. Clean the input guide and output tray with anti-static guard spray every day. 3.3 Technique The Lumisys ACR-2000 is a roughly 200 speed system. If only CR images are acquired, Phototimers should be adjusted for CR exposures.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 3.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION ____________________________________________________________________ 4.0 THEORY OF OPERATION _____________________________________________________________________ 4.1 Product Overview The LUMISCAN ACR-2000 READER is a single-image plate laser scanner designed to scan and digitize the latent image from medical storage-phosphor image plates.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION 4.2 System Configuration The configuration of the LUMISCAN ACR-2000 READER includes optics, electrical and power supply assemblies, PCAs for scanner control and data acquisition, and a plate transport assembly. 4.3 Optical Beam Path The READER contains a laser, laser power supply, fixed optics and mirrors, a scanning galvanometer, light detection system and a electronics subsystem for control.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION 4.4 Digital and Electrical Systems The electrical subsystem of the LUMISCAN ACR-2000 READER consists of the Data Control Board, (DCB), that is located in a PC-type host computer an interconnecting cable to the LUMISCAN, and the scanner, which houses six printed circuit boards. These include: Data Acquisition Board (DACQ), PMT PreAmp Board, Galvanometer Board, Indicator Board. Indicator/ff Interface Board Reference LED Board 4.4.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION 4.4.5 Indicator Board The Indicator Board contains two LED indicator lamps which are used to signal scanner power ON and SCAN status. The SCAN indicator is turned on only while a scan is in process; it also blinks whenever the plate is in the optical path. 4.4.6 Indicator/FF Interface Board The Indicator/FF Interface Board provides an adjustable drive circuit for the Reference LED Board. 4.4.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION 4.4.8 Power Distribution The ACR-2000 READER contains four integral power supplies. One is a high voltage supply for the PMTs. A triple output linear supply provides + 12 volts and +5 volts. One dual linear + 15 volt supply and one dual linear + 12 volt supply. The + 15 and the + 12 volt power supplies are identical except for jumper configuration.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION 4.5 Sub-System Operation 4.5.1 DATA CONTROL BOARD (DCB) The DCB is a standard size PC/XT board occupying 32K bytes of memory space and 24 bytes of I/O space. It supports 8-bit data transfers only and has multiple interrupt capability. The physical memory consists of a single, 72-pin SIMM with 16MB. Image memory is accessible through a 32KB window.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION Control During Scanning During the scanning process the DCB generates the timing and synchronization signals and transfers the image data into image memory as it becomes available. There are three clock generators and three counters: Scan Clock, Film Clock, Pixel Clock, Delay to 1st Pixel count, Pixels per Line count, and Lines per Image count. These are each described briefly below.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION 4.5.2 DATA ACQUISITION BOARD (DACQ) The DACQ board performs all of the signal conditioning and data acquisition functions, including calibration and output table lookup. In addition it generates the Galvo sweep control waveform and provides the Film Motor control and drive.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION In all modes the acquisition process ends with the writing of data into the output register and assertion of the signal DATAVAIL to the DCB. The DCB then transfers the data into the image memory depending on the following; the Mode, the state of ISFILM, the state of the Pixel counter and the state of the Line counter. Calibration and Table Lookup The three possible Lookup table functions are: Correction LUT, Calibration LUT and Output LUT.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION X Only and XY Pixel Averaging Modes The ACR-2000 READER Data Acquisition board is capable of averaging pixel values together, either in X only or in both X and Y. The mode bits are selected in the DACQ CSR. In X-only mode one data value is produced for each two pixel clocks (one DATAVAIL per two PIXTRIGs). The data value is the average of two samples.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION If the CTR jumper is off and the GIVENB bit is cleared then the position will be according the PARK switches, which consist of 6 DIP switches. The position will be equal to the switch value 0 through 4032. (0 through 63 times 64). The beam can be parked at any location within 64 counts by setting the switches. Film Transport Motor Control The ACR-2000 READER film transport motor is a precision DC motor with a 256-count encoder.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.0 THEORY OF OPERATION 4.5.3 PMT PREAMPLIFIER The preamplifier is the interface between the PMT receiving the stimulated light from the collection chamber and the log processing circuits in the Data Acquisition PCA. The preamplifier serves as a current to voltage converter between these two assemblies. The preamplifier is a single integrated amplifier with the input power and common return provided from the Data Acquisition PCA.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 4.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS ____________________________________________________________________________ 5.0 SERVICE ADJUSTMENTS _________________________________________________________________ This section covers the LUMISCAN ACR-2000 READER components that can be adjusted in the field. The following equipment is required for any alignment or adjustment performed in this section of the service manual.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS WARNING ACR-2000 READER Working with and around X-ray equipment and high-power lasers present risks if proper precautions are not taken. The X-ray equipment is housed in a lead-lined room. Never turn the X-ray on unless all personnel are outside of the room and the door is closed. Perform the following steps in a darkened or dimly lighted room so as not to damage the PMT. 5.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 1. Laser Light Verification Install the Interlock Key to allow operation of the Laser with the cover off. Remove the optics cover on the back panel. Turn on the ACR-2000 Reader. Observe that the beam is projecting onto the Galvo Mirror. If the power is on and the Interlock Key is installed and there is no Laser light, the Laser Module is suspect. 2. Folding Mirror Disconnect the J3 power cable to the Galvo PCA.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 5.3 Scan Linearity Adjustment NOTE This Adjustment Must be done in a Darkened Room NOTE Adjustment of the Scan Linearity is rarely necessary. For various reasons, the Linearity Test can sometimes provide a false indication of failure. Test results which are slight out of tolerance are probably genuine. Test results which are far out of tolerance are likely false.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 5.3.2 Place the 14” Linearity Adjust Pattern (P/N 0070-966) in the input slot with the vertical lines facing the unit and the widest red bar towards the abort button. 5.3.3 From the “tools” directory, enter LNADJDT at the command prompt. Enter the Serial Number of the reader. Press to continue. When prompted for Lines to Skip, press . Observe the following screen display. LINEARITY ADJUST TEST, Lumisys, Inc.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 5.3.7 A properly positioned beam will show all 14 bars with a slight gap on either side. Position the beam properly using the following chart. ( Note: The plot window does not update in real time to show beam position changes. To see the results of an adjustment attempt, it is necessary to close the plot window and press the “p” key again.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 5.3.20 Preliminary Scan Adjustment Method A 5.3.20.1 Using an ohmmeter, adjust the following potentiometers to the values listed in the chart. For orientation, observe the PCA’s so that the PCB writing is from left to right.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 5.3.21.5 Visually observe the laser sweep. If the laser sweep extends 1.5 +/- 0.5 inches past the light Collection Chamber opening on the left side and 2.5 +/- 0.5 inches past the light Collection Chamber opening on the right side, then proceed to 5.3.21.6. Otherwise, go back to step 5.3.21.2. 5.3.21.6 The room lights should be dim and the unit covered to minimize stray light. 5.3.21.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 4. Connect the DVM to TP1 of the PMT Preamp PCA, with the black (-) lead on the pin toward the bottom. 5. Adjust R8 on the PMT Preamp PCA to obtain a voltage of +0.0 millivolts, + 0.1 mv. 6. 7. Replace the Front Enclosure. Disconnect the DVM and re-enable the PMT High Voltage. 5.4.2 PMT Output Voltage Preliminary Check 1. Dim the room lights, cover the unit with a dark cloth. 2. Run DDT/10 and enter a “p”.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 5.4.3 PMT Output Voltage Adjustment and Reference Blue LED Adjustment The system must be adjusted so that the signal from a plate exposed at a standard X-ray dosage will give a consistent count level. This depends on the plate used, the laser power, the PMT sensitivity, and the alignment of the DACQ board.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 5.4.4 PMT Output Voltage Balancing 1. Place a well erased 14 x 17” image plate into a cassette. Expose with a dose of 4 mAs at 85 kVp, 71” SID. If a 1mm thick copper plate is available, position the copper plate over the x-ray emitter. This will provide a more uniform exposure. Verify with a high resolution x-ray dose meter that the dosage is 4 mR +/- 0.05 mR.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 18. It is now necessary to make a new CAL Table. To do this proceed to 5.4.5 Calibration Table Generation. 5.4.5 Calibration Table Generation 5.4.5.1 Using NT Driver Disk prior to version 2.00. 1. Place a well erased 14 x 17” image plate into a cassette. Expose with a dose of 4 mAs at 85 kVp, 71” SID. If a 1mm thick copper plate is available, position the copper plate over the x-ray emitter. This will provide a more uniform exposure.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.0 SERVICE ADJUSTMENTS 5.4.5.3 View Plot of the Calibration Table. 1. Go to the command prompt. 2. From the “tools” directory, use the PL.EXE command to plot WINNT\SYSTEM32\DRIVERS\CALXXXXX.DAT where XXXXX is the serial number of the ACR Reader. If necessary, hit the “a” key to auto scale the plot. 3. The Calibration Table plot should appear as follows.
LUMISCAN ACR-2000 READER SERVICE MANUAL - SECTION 5.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 6.0 PERIODIC MAINTENANCE __________________________________________________________________ 6.0 PERIODIC MAINTENANCE ___________________________________________________________________ System Maintenance is classified in four categories, Daily Maintenance, Routine Maintenance, Periodic Cleaning and Periodic Gain Check.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 6.0 PERIODIC MAINTENANCE 6.1.4 Clean area around the system daily. Check for dust. 6.2 Routine Maintenance Maintenance Periods: 24 times every 12 months. 6.2.1 Cleaning Covers The outside covers of the ACR-2000 READER should be cleaned with a mild soap or detergent. Do not spray cleaner directly on the covers. Spray the soap or detergent on a soft, clean cloth, then wipe down the covers. 6.2.2 6.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 6.0 PERIODIC MAINTENANCE CAUTION BE SURE TO USE PROPER ESD PRACTICE WHEN TOUCHING THE ACR-2000 READER WITH THE COVERS OFF CAUTION DO NOT CLEAN THE GALVO MIRROR OR ROOF MIRROR EXCEPT AS A LAST RESORT AND UNDER THE GUIDANCE OF LUMISYS TECHNICAL SUPPORT NOTE DUST OR FIBERS IN THE LASER BEAM PATH MAY AFFECT THE RADIOGRAPHIC IMAGE 6.3.1 6.3.2 6.3.3 6.3.4 6.3.5 6.3.6 6.3.7 6.3.8 6.3.9 6.3.10 6.3.11 6.3.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 6.0 PERIODIC MAINTENANCE 6.4 PMT Output Voltage Adjustment and Reference Blue LED Adjustment 1. Perform the PMT Output Voltage Adjustment and Reference Blue LED Adjustment as specified in Chapter 5 section 5.4.3.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS 7.0 DIAGNISTICS If a system failure occurs, it is necessary to diagnose the cause before effecting the repair. This section describes the diagnostic tools and techniques used to isolate various types of system failures. 7.1 Troubleshooting The cause of some failures may be obvious. In these cases, the Service Engineer may proceed directly to the repair.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS 7.2.3 System Will Not Detect Phosphor Screens If the screen moves into the system several inches and stops without backing up, the screen is not being detected. The most common cause of this failure is a failed Laser Module. To determine if the Laser is functioning, remove the main enclosure, turn the Laser on and visually determine if the Laser is functioning.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS This is an inverted signal with the highest amplitude at the bottom of the plot, which is a value of zero. If the amplitude is not near zero, as an example 500 or 1000, the Laser is not emitting enough light and needs to be replaced. The screen detector plot for older ACR Readers is three spikes, each with an amplitude of approximately 1600. ACR Readers with Data Acquisition PCA part numbers 0070-735 and below have this older screen detector.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS 7.2.5 DI-2000 Self Test Failure If Autozero and AGC both fail, the PMTs are suspect. If Autozero fails, there may be too much ambient light in the room. If AGC fails, perform the PMT Output Voltage Adjustment and Reference Blue LED Adjustment which is in Chapter 5. 7.2.6 No Photo-Multiplier Tube Output Verify that the Laser is emitting light, by using DDT.EXE option 20, with the Laser interlock installed.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS 7.2.7 No Galvanometer Movement The most common cause of no Galvanometer movement is failed drive circuitry on the Data Acquisition PCA. Remove the AUX/IO connector from the Data Acquisition PCA to disable the PMT High Voltage Power Supply. This will protect the PMTs from ambient light during the investigation. Manually roll a 14X17 inch plate into to the beam slot to serve as a backdrop for the laser light. Run DDT.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS 7.3 Diagnostic Programs This document outlines use of some of the diagnostic programs. The Diagnostics programs are used exclusively for diagnostics, testing, aligning and troubleshooting of the ACR-2000 READER. They are intended to be used by service engineers for diagnostic and test purposes only. The following is a list of the current diagnostics that support the ACR-2000 READER product.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS 7.3.1 DDT.EXE Enter > DDT Enter one of the specified numbers (1 through 22, or 'q') at the command prompt. DDT VX.X 1. Scan File 2. Read Data 3. Read Status 4. Load LUT 5. Read LUT 6. Clear CAL Table 7. Plot CAL Table 8. Reset Scan 9. Test CAL/LUT 10. Display A/D 21. System Info q. Exit Program command ->__
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS Enter > 7 (Plot CAL table) - plots the DACQ CAL table. A normal CAL table will look somewhat like an irregular “M” shape. A screen must be scanned before a Cal curve is generated. Enter > 8 (Reset Scan) - This resets the scanner driver. Enter > 9 (Test CAL & LUT Memory) - This writes a specified pattern to the LUT Enter > 10 (Display A/D Value) - This writes a specified pattern to the LUT memory. Resources are either FAILED or PASSED. See 7-10.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS Enter > 20 (Display Noise Value)M= B= Enter > 21 (System Infor)- Detailed system information Enter > 22 (Set CR/Scan5 Mode) Other commands you may enter (not specified by the DDT menu); Enter> o (oscope)- plots the scanline to the screen. Enter > s (screen) - dump contents of screen to a file Enter > pl (plotcal) - Plots a data file to the screen, ie: results.dat.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS Test Lookup Table Load and Readback Function From the DDT menu choose 4. Load LUT. A list of choices will be displayed. Select 1 = 0:4095 12 Bit Lut. Select 15. Choose 5: Read LUT. Select 15 . All 4096 values (in hex) will scroll up the screen in lines of 16. Observe the last column as it scrolls: Verify that the last digit is always "F" while the first digit of the last column increments from "0" through "F".
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS 7.3.2 SCANFILE Scanfile using the following parameters: Pixels per line : 2048 Pixel depth : 12 bits/pixel Pixel format : LSB LUT format : Normal Filename : lsdt.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.0 DIAGNOSTICS PMT Register /PMT: 0 through 255 Edges /NOEDGE /EDGE If the user would like to scan a screen into a file called image5.img using defaults, from the MS-DOS prompt type: "scanfile /f:image5.img" This command will digitize a screen using 12 bits, 1024 pixels in width, create a header and put a file named image5.img in the current directory.
LUMISCAN ACR-2000 SERVICE MANUAL – SECTION 7.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.0 REPLACEMENT PARTS 8.0 INTRODUCTION This section discusses the various components of the LUMISCAN ACR-2000 READER digitizer that can be replaced in the field. It also details the removal of theLUMISCAN ACR-2000 READER covers, along with component removal and replacement. Components which can be replaced in the field are called field replaceable units, or FRUs. These will be discussed later in this section. 8.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.0 REPLACEMENT PARTS PMT PRE-AMP PCA REMOVAL The following tools will be necessary to remove the PMT system: 1. Flat blade screwdriver 2. Philips #2 screwdriver The PMT PreAmp PCA is located at the top of the Collection Cylinder (Figure 8-2). Remove the Main enclosure and Front cover to gain access to the PMT Preamp. CAUTION: There are several wires coming from the tube's connector going to J6 on the PMT PCA. These wires are fragile and could break if mishandled.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.0 REPLACEMENT PARTS 3. Loosen the two 7/64” clamp screws recessed in the back side of the tower. Remove the PMT face first (from the bottom), being careful not to get fingerprints on the blue filter. 4. Remove the blue filter attached to the PMT. 5. Attach the blue filter to the replacement PMT with black photographic tape. Overlap the top of the filter with about 1/8 inch of tape. Fold the tape edge over the filter to secure the filter to the PMT.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.0 REPLACEMENT PARTS 3. Special attention must be given to adding jumpers on JP2 and JP3 on the Laser Diode Driver board when removing the laser assembly, and removing these jumpers after the replacement assembly is installed. If these steps are not followed carefully, damage can occur to the laser diode. REMOVING LASER DIODE MODULE 1. Turn off the system and remove the main enclosure. 2.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.0 REPLACEMENT PARTS 4. Connect the interlock cable to the interlock switch. 5. Reinstall the Galvo PCA. Refer to Section 5 “Final High Voltage Adjustment and Reference LED Adjustment” to set the high voltage and Blue LED. Occasionally after replacing the laser module the spot size is adversely affected resulting in poor image resolution. The fiber optic tip not being inserted correctly into the connector on the lens barrel assembly often causes this.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.0 REPLACEMENT PARTS Triple block line pair pattern trace (at center). 7. While gripping the locking ferrule (which you tightened when you put the fiber optic cable tip) gently move the connector until you see amplitude changes in the line pair traces. You want to achieve the best possible amplitude of the smallest line pair block. The actual amplitudes will vary some from test pattern to test pattern.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.0 REPLACEMENT PARTS 4. Unplug the Galvo Motor cable from the driver board. 5. Remove the four 7/64” hex-head screws holding the Galvo motor from the Galvo mount assembly. Be very careful not to scratch the replicating mirror. 6. Remove the Galvo motor and retain the 4 plastic shoulder washers and plasticisolation gasket. 7. Remove the replicating mirror from the galvanometer shaft. 7a. The mirror is secured by a .050” nylon tipped set screw.
LUMISCAN ACR-2000 SERVICE MANUAL - SECTION 8.0 REPLACEMENT PARTS 6. Without touching the mirrored surface, using the mark on the Post-it note as a reference, carefully rotate the replicating mirror until the beam spot is centered with respect to the collection chamber. Don’t worry if the spot is not perfectly aligned along the y-axis (vertically bisecting the slot itself) and slightly above or below the mark. 7. Tighten the set screw on the mirror. 8. Replace the access cover.
ACR-2000 SERVICE MANUAL - SECTION 9 SCHEMATICS SCHEMATICS AND DRAWINGS PART NUMBER _____________________ DESCRIPTION __________________________ 0070-578 TREE, PRODUCT, LS135 0071-317 DIAG, AC & DC WIRING, LS135 0071-318 DIAG, SYSTEM INTCON & PWR DISTRIBUTION, LS135 0070-679 SCH, REF LED, SCRN PRES1, V2 0070-235 SCH, DCB3, V1, LSDT 0068-855 SCHEMATIC, GALVO DRIVER V5, LSDT 0071-552 SCH, BLUE LED/ISFILM, LS135 0070-254 SCH, PMT PREAMP, V1, LSDT 0071-997 SCH, DATA ACQUISITION BOARD 4, V1, L
_________________________________________________________________ APPENDIX A: LUMISCAN ACR-2000 Reader JUMPER AND SWITCH SETTINGS ______________________________________________________________________________ Identifying your Data Control Board (DCB) There are three versions of the DCB in existence. The newer DCB3 has slightly different switch settings than the DCB1 or DCB2.
Changing Window Address The LUMISCAN 50 / 75 / 85 is factory configured to use a 32-Kbyte window starting at address D0000 and ending at D7FFF. The upper 5 bits of the address are set with the 6-position ADDRESS SELECT SWITCH (S1-1 through S1-5) on the DATA CONTROL BOARD (DCB), switch position S1-6 is used to set the BASE I/O ADDRESS.
EMM386.EXE and your CONFIG.SYS Whichever DCB memory address is used, your CONFIG.SYS should be modified to exclude the DCB Memory Mapped Address range from use by EMM386.EXE. The following line is normally used: DEVICE=C:\DOS\EMM386.EXE NOEMS X=D000-D7FF Changing the BASE I/O ADDRESS Switch S1-6 is used to control the BASE I/O ADDRESS.
Changing the MEMORY SIZE For DCB3s, switch S1-8 is used to specify the size of the installed memory: MEMORY SIZE S1-8 4 MBytes OFF 16 MBytes ON Appendix - 4
