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LUMISCAN LSDT SERVICE MANUAL

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1. POWER DISTRIBUTION DACQ J3 SIGNAL DISTRIBUTION Figure 9 6 Cable Routing DACO J13 DACQ J2 DACQ J12 9 13 DACQ J6 DACQ J5 DACQ J8 DACQ J9 LSDT SERVICE MANUAL SECTION 9 0 LS20 LS20 ADJUSTMENTS This section provides the method of alignment verification or re alignment of the detection sub system Note In this procedure when a Digital Volt Meter DVM is specified an Oscilloscope can be substituted Note No ambient light is allowed for these measurements DACQ PCA P N Model CCDout Version 0069 578
2. PART 230V e AN 240V 0000O 250mA 250V S B P 315mA 250V S B F3 315mA 250V S B F4 250mA 250V S B F5 1A 250V S B B Lumiscan 2 0 d dd HI POT TEST COMPLETE Figure I 2 LUMISCAN 20 Labels 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 LSDT 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 FCC Notification This equipment generates uses and can radiate radio frequency energy and if not installed in accordance with the installation instructions can cause interference with radio communications ix LUMISCAN LSDT SERVICE MANUAL INTRODUCTION Vig PS Figure I 3 LS50 75 85 Label Locations Figure I 4 LS20 Label Locations LUMISCAN LSDT SERVICE MANUAL INTRODUCTION LUMISCAN LSDT SYSTEM SPECIFICATIONS SCAN SIZE PIXEL RESOLUTION SCAN RATE DENSITY RESOLUTION DENSITY RANGE MEASUREMENT NOISE GREY SCALE RESOLUTION INTERFACE DIMENSIONS POWER REQUIREMENTS 5 x T to 14 x 28 LUMISCAN 20 146PPI 7 to 14 LUMISCAN 50 1024 8 to 14 128 PPI Films less than 8 LUMISCAN 75
3. 12V ON OFF 9044 SWITCH 5v 0068 849 SEZM4S 92A HTAA 16W A 0065 288 2 PS3 i15V 0 8A HAA15 0 8A PS5 15V 0068 850 0 8A HAA15 0 8A 1o F PS2 i15V Q0 8A HAA15 0 8A 0062 028 l REF AMP y 0062 036 4 0068 321 n 0062 052 3Z 10 Kn DCB C i 0068 560 FILM FEEDER INTERFACE PCA 0068 669 2 J3 CJ 3 SOLENOID 0068 559 ABORT SWITCH 61494 404 Figure 4 5 LUMISCAN 85 Power and Electrical System The Digital Control Board receives its power from the host computer No power is transmitted over the interconnect cable 4 6 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION This page intentionally left blank LUMISCAN LSDT 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 one 16MB 72 pin non parity SIMM Image memory is accessible through a 32KB window This window can be positioned on any 32KB boundary within the standard 1MB DOS address space by means of five DIP switches on the DCB Memory page selectio
4. 4096 to 14 300 PPI Films less than 8 LUMISCAN 85LF 4096 11 to 14 350 PPI Films less than 11 LUMISCAN 85 5120 10 512 PPI 10 films LUMISCAN 20 81 lines second LUMISCAN 50 115 lines second LUMISCAN 75 115 lines second LUMISCAN 85 85LF 75 lines second 0 001 optical density 05 to 3 2 Optical density LS20 03 to 3 60 Optical density LS50 75 03 to 4 1 Optical density LS85 85LF Less than 0 01 at 2 5 optical density 12 bits 4096 levels PC Interface Card With LUMISCAN 20 75 85 85LF 16 Mbytes Memory 20 5 W x 13 H x 27 D 100 to 120V 50 60 Hz 1 5 Amps 220 to 240V 50 60 Hz 1 0 Amps LUMISCAN LSDT SERVICE MANUAL INTRODUCTION TEMPERATURE 15 to 35 degrees C operating CONSTRAINTS 18 to 65 degrees C non operating HUMIDITY 20 to 80 non condensing VIBRATION ACCELERATION 3G Max in shipping ALTITUDE 0 to 10 000 ft operating WEIGHT 75 pounds 125 pounds shipping weight xii LUMISCAN LSDT 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 LSDT pre installation This includes environmental electrical and physical parameters 1 2 Voltage Requirements The LUMISCAN LSDT operates at 120 VAC for domestic units International units operate at 220 240 VAC To change the voltage of the LUMISCAN LSDT follow the procedure in SECTION 2 0 of the Service Ma
5. 0 or higher 2 4 2 ISA Interface Emulator Installation SCSI Interface To install the software place the floppy distribution disk in drive A Run SETUP EXE and follow the instructions The installation software will create a directory on the hard disk and transfer the required software from the floppy disk to the hard disk It will also create a Lumisys program group and create or update various registry entries If installing to Windows NT you will be prompted for DCB or SCSI configuration Select SCST configuration Installation types are Compact only installs DRIVER DLL TOOLS and LSEXP EXE Typical same as Compact Custom recommended by default installs everything Compact plus development files 2 13 LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION This page intentionally left blank 2 14 LUMISCAN LDST SERVICE MANUAL SECTION 3 0 SYSTEM OPERATION 3 0 SYSTEM OPERATION 3 1 Power Up The power switch on the LUMISCAN LSDT 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 The top LED is labeled Power while the bottom LED is labeled SCAN SCAN SCAN ABORT SWITCH Figure 3 1 LED Locations When power is turned on the Power LED illuminates Once the power is turned on the PC power should also be turned on booted and the driver installed NOTE The LUMI
6. 015 Intercept Min 0 015 Max 0 015 R R Value Min 9997 If the specifications are met the digitizer calibration is completed If after a few film scans the specifications are still not met the next step depends on the nature of the failure Marginal failures If the results are only slightly out of specification double check the voltage settings and try again If possible try another film Try section 9 6 1 LS20 Density Verification Test If this test passes the digitizer calibration is completed If this test fails perform section 9 6 2 LS20 Setting the Dynamic Range 6 Severe failures If the specification failure is severe the DACQ PCA may be misadjusted In this case perform section 9 6 2 LS20 Setting the Dynamic Range 7 Before using the new CLUT reboot the computer Diagnostics Refer to Section 7 of the Service Manual for a description of the diagnostic tools 9 19 LSDT SERVICE MANUAL SECTION 9 0 LS20 PERIODIC MAINTENANCE System Maintenance is classified in two categories Routine Maintenance and Periodic Maintenance Routine Maintenance is normally performed by the system operator and periodic maintenance is performed by a trained service engineer Routine Maintenance Maintenance Periods 6 to 8 times every 12 months 1 Cleaning Covers The outside covers of the LUMISCAN DESK TOP SCANNER should be cleaned with a mild soap or detergent Do not spray cleaner directly on the LUMISCAN covers Spray the soap or dete
7. 025 Max 0 025 R R Value Min 9997 SAME If the specifications are met the digitizer calibration is completed If after a few film scans the specifications are still not met the next step depends on the nature of the failure 6 Marginal failures If the results are only slightly out of specification double check the voltage settings and try again If possible try another film Try section 5 4 4 Density Verification Test If this test passes the digitizer calibration is completed If this test fails perform section 5 4 6 Setting the Dynamic Range 7 Severe failures If the specification failure is severe the DACQ PCA may be misadjusted In this case perform section 5 4 6 Setting the Dynamic Range 8 Before using the new CLUT reboot the computer 5 4 6 LS50 75 85 85LF Setting the Dynamic Range Note It is rare that section 5 4 6 Setting the Dynamic Range is necessary Please perform this procedure only as a last resort for density failures preferably after consulting with Lumisys Technical Support 1 Run DDT 1 Select option 4 Load LUT 2 Select option 1 0 4095 12 BIT LUT 3 Select option 6 Correction LUT Memory Location 4 Select option 10 Display A D Value Observe the monitor display the following will be displayed The actual values may differ minVal pixel 512 30 maxVal 3675 minVal pixel512 30 maxVal 3675 5 15 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS minVa
8. 10 7 3 The Altera EPM7128E at U2 controls the memory interface and bus cycles of the 386EX It outputs a synchronized CPURESET signal from the PWRGD signal and tracks the bus cycles When CS4 is active the EPM7128E generates the proper control signals for the DRAM RASx CASxx WE and the address MUX ROWSEL COLSEL The inputs BHE and BLE are used to detect a refresh cycle The Flash disk is accessed with CSO CS6 and UCS U2 outputs FLSHCS for U10 by a logical AND of CS6 and UCS FLSHWE is generated for all Flash write cycles U2 also outputs the ENDATA signal for controlling the data buffers U3 and U4 These buffers are needed to prevent a possible bus conflict when the 386EX transitions from a read to a write cycle MEMORY The memory section contains the DRAM address MUX and two Intel 8Mbit flash chips The SIMM socket can accommodate 1 4 or 16 megabyte SIMMs JP2 and JP3 are set differently for each configuration see table from schematic UCS is used for accessing the BIOS DOS and the ROM bootdisk contained in the upper 256K of U10 The lower 896K is used as a read write Flash disk U28 is an optional extra 1 megabyte of flash disk controlled by CSO and activated with a device driver loaded at boot up The flash disk consists of two Intel SmartVoltage programming voltage Vpp 5 or 12 volts boot block flash chips The Vpp control circuit allows the driver to turn on the Vpp when a write cycle is needed Vpp can als
9. ADJUSTMENTS 6 0 PERIODIC MAINTENANCE 7 0 DIAGNOSTICS 8 0 REPLACEMENT PARTS 9 0 LS20 10 0 LSDT INTERNAL SCSI 11 0 SCHEMATICS Appendix A Jumper and Switch Settings Appendix B Product Changes and Enhancements Appendix C Sample Density File iii 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 LUMISCAN LSDT SERVICE MANUAL INTRODUCTION This page intentionally left blank iv LUMISCAN LSDT SERVICE MANUAL INTRODUCTION INTRODUCTION OVERVIEW Product Features The LUMISCAN LSDT is a laser film digitizer capable of digitizing films up to 14 x 17 in size It is a precision instrument designed to scan film and directly measure optical density over a wide dynamic range with a high signal to noise ratio This is accomplished with a spot of light derived from a Helium Neon laser that is scanned across the film plane as the film is moved perpendicular to the laser scan The transmitted light is collected converted to an electrical signal and digitized to provide a 8 bit or 12 bit resolution image that can be stored on the Host disk and transferred to other systems for image processing manipulation and printing High Resolution The LUMISCAN 20 can digitize up to 2048 pixels over a film width of 14 The LUMISCAN 50 can digitize up to 1024 pixels over a film width of 14 The LUMISCAN 75 can digitize up to 4096 pixels over a film width of 14 The LUMISCAN 85LF can digitize up to 4096 pixels over a film wid
10. Adjust R105 CW until the trace on CH1 jumps up to stability Rotate an additional 1 8 turn Proceed to step 10 9 Note This step is only for DACQ PCA s with an R103 and an R105 potentiometer 9 1 If you are experienced at this adjustment proceed to step 9 5 9 2 Connect a DVM to the right side of R104 Adjust R103 for OV 0 1V 9 3 Rotate OFFSET CCW until it clicks Rotate OFFSET CW 22 turns 9 4 Adjust SLOPE to achieve 1 5V where the tape blocks the beam on CH1 TP1 for version 1 2 3 4 6 DACQ PCA s Version 5 DACQ PCA s should be adjusted to 0 5V The version chart on page 5 9 can be referenced to determine which version you have 9 5 Adjust R103 CCW to cause instability at the junction of the tape and film CH1 The signal should jump down at least 0 5V 5 17 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 9 6 Adjust R103 CW until the trace on CH1 jumps up to stability Rotate an additional 1 8 turn 10 Verify the OV reference on the oscilloscope Move the taped film in and out of the beam Use SLOPE and OFFSET to achieve a minimum A D Count of 30 with the beam unblocked this will correspond to approximately 2 45V peak on CH1 or 1 98V peak for VS DACQ PCA and a maximum A D Count greater than 4060 and less than 4090 with the tape blocking the beam this will correspond to approximately 2 45V on CHI or 0 02V for V5 DACQ PCA for LS50 LS75 and LS85LF For the LS85 standard the maximum A
11. DCB hardware Also reloads the CLUT Enter 17 quit Set Averaging Mode Unused for current system Enter gt 18 Set laser Mode Turns LED s on and off Enter gt 19 Pulse Film Feed Loads a film from the film loader Enter gt 20 Display Noise Value Enter gt 21 System Infor Detailed system information 7 8 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS Other commands you may enter not specified by the DDT menu Enter gt 0 oscope plots the scanline to the screen Enter gt s screen dump contents of screen to a file Enter gt pl plotcal Plots a data file to the screen ie results dat The following sections are guidelines for troubleshooting sections of the scanner using DDT Test DACQ Calibration and Lookup Table Access Run DDT From the menu choose 9 Test CAL and LUT Memory From the submenu choose 1 Up Ramp Test The test was successful if the screen prints PASSED and returns to the main menu otherwise it will print the first 64 errors Repeat test 9 for the following submenu choices 2 Down Ramp Test 3 Walking 1 Test 4 Walking 0 Test Test Cal Table Clear Function From the DDT menu choose 6 Clear Calibration Table There will be no output the screen just redisplays the menu Choose 7 Plot Cal Table A graph should appear on the screen displaying 1024 values of 4096 Max Value 4096 Min value 4094 Hit any key to return to menu Test Lookup Table Load and Readback Fun
12. Enter cmd H Q P D E q Do you wish to write the density file Y N y Saving values to file den001 dat Note writing a file to the Flash memory can take a long time 2 minutes D gt 10 9 2 ED Simple Line Editor ed line oriented text editor similar to UNIX V7 ed ED is a very simple line editor It can be used to edit all the text files used by the internal controller system even the density file normally edited by EDDEN Normally ED is only used to modify the LSDTCNFG DAT file 10 9 2 1 ED Syntax ed existing file existing file Only an existing file can be opened Otherwise a nameless edit buffer is opened a name can be used with the f or w commands As a line editor ed operates in one of two modes COMMAND mode in which a colon is displayed at the screen s bottom to prompt for a command and INPUT mode in which all keyboard input is added to the file edit buffer From COMMAND mode INPUT mode is entered by either the i or a commands From INPUT mode the COMMAND mode is restored by entering a line consisting of a single period by itself If such a line is desired in the file it can be created by entering for instance two periods then using the s command to change these to only one period A command consists of an optional line range specification a single character indicating the command and for some commands an optional third argument The line range specification is either a single line number or
13. FIFO and system DRAM to buffer the image data and the ISA DCB uses its own on board DRAM for buffering Three Altera PLD s control the DCB section The EPM7032 at U21 DCCSR controls the two 82C54 timer chips at U16 and U18 10 6 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI It also contains the DCB CSR register and DCB interrupt generator The EPM7064 at U12 DCPCKA4 is used as an 11 bit pixel clock counter and buffer control for the DCB internal data bus LDO LD7 It also contains the MSB 1st and 8 16 bits of the DCB CSR The EPM7032 at U23 DCBSCDCD decodes the address and generates the chip selects for the DCB and DACQ registers base address 0x0100 and the 53CF94 SCSI chip registers base address 0x0140 U15 is enabled for I O address 0x0103 to access the current states of the external events 0 and 1 isfilm and SOS Each 82C54 timer has three independent 16 bit counters that can be configured to operate in several different modes Mode O interrupt on terminal count is used for all counters A value is loaded into each counter and the count decrements for each clock pulse The OUTx output goes high whenever a counter reaches zero Five of the six timers are used for the DCB section The first counter is used for the scan clock SCANCLK is used by the DACQ board to generate the SOS start of scan signal SOS indicates the beginning of the galvo sweep for a laser scanner or generates a trans
14. It is used as the reference for a frequency controlled servo motor driver which controls the film transport motor The Film speed is directly proportional to this frequency Since the LS20 has a fixed pixel size this value should not be changed The Pixel Clock is a gated trigger signal derived from 40Mhz The trigger signal is sent to the DACQ during each scan line after the completion of the Delay to 1st Pixel count and until the completion of the Pixels per Line count In the LS20 it must be synchronized to the Scan clock and is set for 500Khz It should not be changed The Delay to 1st Pixel counter counts the Pixel clocks beginning at SOS and terminating when its preset count is reached The Pixels per Line counter is enabled at the termination of the Delay to 1st pixel count and counts Pixel clocks terminating when its preset count is reached If enabled an interrupt request will be generated at count termination The Lines per image counter is enabled at the beginning of a scan and is incremented at the end of each scan line terminating when its preset count is reached If enabled an interrupt request will be generated at count termination The usual value for this counter is 65 535 maximum which effectively disables this control and permits the Isfilm signal to be used to control acquisition 9 6 LSDT SERVICE MANUAL SECTION 9 0 LS20 Interrupt Requests There are four possible sources for interrupt requests by the DCB Last p
15. LS20 2 8V 4 0069 871 LS20 2 8V 4 0070 266 LS20 2 8V 5 0070 974 LS20 2 8V 5 0071 689 LS20 2 8V 6 9 6 0 LS20 DACQ PCA Final Alignment Note This procedure only applies to digitizers which have failed the LS20 Density Accuracy Verification Test 9 6 1 or for which the DACQ PCA or LED PCA or CCD PCA have been replaced If one of these PCA s has not been replaced proceed to 9 6 1 1 Remove the connector on J3 of the LED Interface PCA note removal of the connection causes the LED s to remain full on not in idle mode Ensure that the LED light is not obstructed by a film or lens cap 2 Connect CHI of the oscilloscope to TP9 of the DACQ PCA Trigger on TP8 SOS Verify that the peak voltage on CH1 is greater that 1 6V and less than 3 0V If the peak voltage is out of this range adjust R38 on the LED PCA to achieve as close to 2 8V as possible 3 Run DDT Select option 4 Load LUT Select option 1 0 4095 12 BIT LUT Select option 6 Correction LUT Memory Location Select option 4 Load LUT Select option 1 0 4095 12 BIT LUT Select option 5 Smoothing LUT Memory Location Select option 10 Display A D Value Se Eo pas Observe the monitor display the following will be displayed The actual values may differ minVal pixel 512 2 30 maxVal 3675 minVal pixel 512 2 30 maxVal 3675 minVal pixel 512 2 30 maxVal 3675 9 14 LSDT SERVICE MANUAL SECTION 9 0 LS20 4 On the DAC
16. LSDT tools programs LNADJDT EXE Linearity adjustment MKCLUT BAT Batch file to automate the generation of CLUT DAT CHKCLUT BAT Batch file to verify CLUT works correctly DDT EXE Diagnostic used to exercise the Driver amp Scanner PL EXE Plots a line of data from image file screen EXAMPLE DEN Example density file SCANFILE EXE Example DOS LSDT application LSDTVXXX COM LSDT DOS Driver FINDMEM EXE 32K block free memory detector for DCB placement DROPHILM EXE Command the optional Film Feeder to drop a film MULTSCAN EXE Test optional Film Feeder 7 5 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS 7 3 1 DDT EXE Enter DDT EXE Enter one of the specified numbers 1 through 19 or q at the command prompt date time Scan File Read Data Read Status Load LUT Read LUT Clear CAL Table Plot CAL Table Reset Scan Test CAL LUT Display A D System Info q Exit Program command Change Parameters Start Motor Diagnostic Scan Test Image Memory Stop Scan amp Eject Reset Hardware Set Averaging Mode Set Laser Mode Pulse Film Feed Display Noise Value COONAN ADU i0 P rP MDOrPrPRP PRP PPP esum deme ome ape Le 2 d 4 5 6 d 8 9s 1 2 Enter gt 1 Scan Film insert film to be scanned Film will be scanned image will be stored in DCB memory You can also test the SCAN ABORT button when scanning a film Press the SCAN ABORT button
17. No 5 0071 352 LS75 6V OmV Yes Yes Yes No 6 0071 695 LS75 6V OmV Yes Yes Yes No 6 0072 030 LS75 6V OmV Yes Yes Yes No 6 0068 875 LS85 8V OmV Yes Yes No Yes 2 0069 099 LS85 8V OmV Yes Yes No Yes 3 0069 741 LS85 8V OmV Yes Yes No Yes 4 0069 959 LS85 8V OmV Yes Yes Yes Yes 5 0070 200 LS85 8V OmV Yes Yes Yes Yes 4 0070 982 LS85 8V OmV Yes Yes Yes Yes 5 0071 413 LS85 8V OmV Yes Yes Yes Yes 6 0071 698 LS85 8V OmV Yes Yes Yes Yes 6 0069 621 LS85LF 8V OmV Yes Yes No Yes 3 0069 744 LS85LF 8V OmV Yes Yes No Yes 4 0069 961 LS85LF 8V OmV Yes Yes Yes Yes 5 0070 201 LS85LF 8V OmV Yes Yes Yes Yes 4 0070 984 LS85LF 8V OmV Yes Yes Yes Yes 5 0071 414 LS85LF 8V OmV Yes Yes Yes Yes 6 Tf this DACQ PCA is installed on a digitizer with PMT Preamp PCA s 0064 193 Rev 1 through 4 or 0069 206 set to 8V 5 9 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS These DACQ PCA s cannot be installed on digitizers that have PMT Preamp PCA s 0064 193 Rev 5 or 0070 252 If this is the case replace the PMT Preamp PCA with 0069 206 NOTE Allow the LUMISCAN to warm up for at least 15 minutes prior to making any adjustments CAUTION When making these adjustments be aware that the Photomultiplier tube is EXTREMELY sensitive to light When you remove the cover use a photographic dark cloth to prevent ambient light from damaging the tube or effecting your density adjustments 5 4 1 REF AMP Adjustment Note If the digitizer does not have a Beam
18. Splitter Ref Amp Assembly proceed to 5 4 2 CAUTION This procedure must be performed in a low light environment or the system must be covered with a photographic dark cloth Note The adjustment pot R2 is accessible through a hole in the side of the frame near the lower left corner of the DACQ PCA Be sure that the laser has been on for at least 10 minutes before making this adjustment 1 Cover the system with a photographic cloth 2 Connect the DVM to the DACQ PCA REF test point Measure the Ref test point and record the Minimum and maximum voltage levels Note Variations of this voltage are normal and are due to normal variations in the laser output power 3 Adjust the Reference Amplifier PCA Pot R2 to obtain a voltage reading of 2 15 volts 0 1 v at the mid point between the min and max voltage reading from step 2 4 Disconnect the DVM 5 4 2 PMT Preamp Offset Adjustment 1 Disconnect the PMT high voltage This is most conveniently done at the connector pair which is bulkhead mounted in the frame Disconnect the plug on the inside On newer digitizers there may not be a bulkhead mounted connector In this case disconnect the AUX I O cable at J14 of the DACQ PCA 5 10 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 2 Set the DVM for the mV range Measure at TP1 on the PMT Preamp PCA Find the appropriate PMT Offset voltage on page 5 9 If the voltage is correct 0 1 mV re connect the PMT h
19. THEORY OF OPERATION INTERNAL SCSI z Print 21 lines or may be given and mean start 21 lines previous end at current line start 11 lines previous end 10 lines hence or start at current line end 21 lines from here respectively After entering the terminal emulator mode it may be necessary to power down the scanner and power up again to reset the Internal SCSI PCA properly to communicate through the Serial Port The Scanner will boot up into the LSDTSCSI mode Enter Q to quit LSDTSCSI and the D gt prompt will appear All diagnostics are run from this prompt All diagnostics are run as described in Sections 5 and 7 in the LSDT Service Manual The exception is there is no graphics capability Therefore we are unable to view the plots when making or checking a CLUT or viewing the Calibration Curve Also the PL S and other commands are not active from the LNADJDT menu After quitting the LNADJDT program the film doesn t automatically eject Push the Scan Abort button to eject the film 10 10 TROUBLESHOOTING If problems occur with the Scanner diagnostics and adjustments should be made using the Serial Port The program Scanfile is not available but in the program DDT option 1 Scanfilm can be run followed by option 2 Read Data to verify film scanning Diagnostic programs such as Mkclut Chkclut and LNADJDT can also be run to check for proper scanning If all diagnostics run but the
20. Testing The adjustment for the PMT system is located in Section 5 0 of this manual 2 ERES 2X SCREW 2X SCREW I EME TOWER PMT TUBE 4X SCREW N bos 4X SCREW INSULATOR M o 4X SCREW PMT PCA COVER A COLLECTION TUBE ASSY 65547 124 Figure 8 2 PMT Tower amp Pre Amp 8 4 Laser The Laser Tube can be replaced by the following the procedure outlined below 1 Turn off the system 2 Remove the scanner cover 4 If a Ref Amp Beam Splitter is installed in the system remove the Galvo PCA 8 4 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 5 Remove the screws securing the laser clamp Laser Replacement Installation 2 Position the Laser so that approximately 5 0 of the Laser s light emitting end extends beyond the laser Mount Reinstall the Laser clamp 4 Plug the laser power cord into the laser hi voltage bulkhead connector Turn system on 5 Align the optical path as described in Chapter 5 i Adjust the PMT High Voltage and Ref Amp as directed in Chapter 5 APERATURE SCREW LASER TO BE POSITIONED 5 FROM THE END OF ITEM 5 HIGH VOLTAGE CONNECTOR Figure 8 3 Laser and Beam Splitter 8 5 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 8 5 Galvo Removal 1 Remove the scanner cover 2 Unplug the Galvo Motor cable 3 Remove the four screws holding the Galvo motor from the Galvo mount assembly 4 Remove the Galvo motor retaining the 4 plastic shoulder washe
21. These settings are hardware selectable on the DCB The TSR driver command line needs to match the DCB resource hardware settings The default resources are Segment Address DOOO IRQ 5 and Base I O 100 If these resources are used it isn t necessary to change the TSR driver command line The most common alternate DCB resources are Segment Address D800 IRQ 7 and Base I O 120 To verify the driver is installed properly perform the following steps Go to a DOS prompt Navigate to C LSDT TOOLS Insert a film Run the SCANFILE EXE program At the end of the scan the number of pixels per line and the total number of lines should be roughly proportional to the film dimensions As an example a 14 x 17 inch film digitized by an LS75 at the default resolution would be 2048 pixels per line and approximately 2500 total lines in the image If the total number of lines significantly differs from the proper ratio there is probably a Memory Segment conflict If the film halts mid scan or doesn t scan there is probably a Base I O Address conflict If the film goes all the way through the system without scanning there is probably an IRQ conflict 2 12 LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION 2 4 ISA INTERFACE EMULATOR SOFTWARE INSTALLATION SCSI Interface The LUMISCAN 20 50 75 85 comes configured with either the ISA Interface for PCs or the SCSI Interface for PCs and workstations For newer digitizers only Lumisys provides ISA I
22. a first line number and a last line number separated by a comma The character means the first line of the file means the last line of the file If the input command does not process correctly the Oops error message will be displayed 10 9 2 2 ED Commands lt newline gt If a line is specified make that the new current line Otherwise advance the current line pointer by one line Print the line number of the current line by itself Print the current line by itself Move the current line pointer back one and print the new current line 10 13 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI 2reoD api w W by itself Move the current line pointer forward one and print the new current line Execute a shell command and return Go into INPUT mode with a new line following the current line INPUT mode is terminated by an input line containing only a period in the first column Go into INPUT mode with a new line preceding the current line INPUT mode is terminated by an input line containing only a period in the first column Delete the specified lines or the current line and then add new lines in their place This is equivalent to a d command followed by an i command Delete the specified range of lines or the current line Leave the current line pointer at the following line Clear the edit buffer and begin editing a new file This command fails if th
23. always sent by the DCB active galvo scanning is enabled by the Galvo Enable bit in the DACQ CSR This is divided by 8 in DQFMGV GDF which generates the SOS signal Thus the scan synchronization begins here The SOS signal initiates a galvo sweep and also is sent back to the DCB to begin the line acquisition sequence The Galvo board is now a more standard servo control amplifier and the interface is simpler The sweep is linearized with a lookup table GLVLUT DAT which converts the linear stairstep output from the generation circuit into an S shaped waveform The amplitude and DC offset of the output signal can be varied by two on board potentiometers 4 16 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION Galvo Rest Positions If the SCANCLK signal is present and the GLVENB bit is set in the DACQ CSR then the galvo sweep signal will be generated causing the galvo to sweep If the GIVENB bit is cleared the galvo will stop sweeping and will take a static position according the settings of the PARK switched and the CTR jumper If the CTR jumper is installed the position will be at count 2048 which is the electrical midpoint of the sweep This is irrespective of the setting of the PARK switches 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 O thru 4032 0 thru 63 times 64 The b
24. any time during a scan Pressing SCAN ABORT has the following effect Press SCAN ABORT 1st time stops film Press SCAN ABORT 2nd time reverses film Press SCAN ABORT 3rd time stops film Press SCAN ABORT 4th time forwards film Press SCAN ABORT 5th time stops film Enter gt 2 Read Film this reads the image stored in DCB memory by a previous SCAN FILM into a file The default file is LSDT IMG 7 6 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS Enter gt 3 Read Status the current status of the scanner driver is displayed Example status after 14 x 17 film scanned LS50 LS75 LS85 Driver Status Phase 0 IDEL 0 Pixels Per Line 1024 2048 4096 Lines Per Film 1240 2461 5406 Data Count 2539520 10080256 Scan Mode 0 Pixel Depth 12 bits 0 LSB MSB LSB FIRST Status of Last Scan SCAN COMPLETE DCB CSR E0CO DACQ CSR 0002 DACQ Model 50 75 85 Hardware Status 0000 DCB BANK Sel Reg 004E Enter gt 4 Load LUT download to the DACQ a specific LUT Enter gt 5 Read LUT read from the DACQ a specified LUT The LUT you read should reflect the LUT you most recently downloaded to the DACQ Enter gt 6 Clear CAL table clears the CAL table on the DACQ to 4095 Enter gt 7 Plot CAL table plots the DACQ CAL table A normal CAL table will look somewhat like a Normal distribution bell curve A film must be scanned before a Cal curve is generated Enter gt 8 Reset Scan This
25. be loaded by the user for the software to work To load the driver the user should add the command Isdtvxxx to the AUTOEXEC BAT or from the MS DOS command line type LSDTVxxx Note that in all versions of Windows if you load the driver from a DOS session it will only work for programs run from that DOS session not from programs run from a desktop icon The driver occupies approximately 17 500 decimal bytes of memory NOTE in some older versions of Software the Driver was called L850Vxxx COM Also it may be convenient to add C LSDT Tools to your PATH statement NOTE Information on driver switches used to alter the DEFAULT driver settings are described in APPENDIX A LUMISCAN 20 50 75 85 JUMPER AND SWITCH SETTINGS 2 3 4 Windows NT ISA Interface To install the software place the floppy distribution disk in drive A Run SETUP EXE and follow the instructions The installation software will create a directory on the hard disk and transfer the required software from the floppy disk to the hard disk It will also create a Lumisys program group and create or update various registry entries In the NT Control Panel a Device will be created called LSDT The LSDT Device can be configured to start manually or automatically Until free Data Control Board resources are found it is recommended that manual startup be selected to prevent the PC from freezing upon boot up because of a resource conflict Installation types are Com
26. board 6 Run DDT Option 10 While observing the laser sweep adjust Galvo Span and Galvo Offset so that the ends of the laser sweep extend past the Collection Chamber opening but not past the frame with the exception of the LS85 Standard Adjust the beam span of the LS85 Std to 11 5 inches 7 Connect oscilloscope trigger sync channel to TP8 SOS on the DACQ PCA Trigger on Slope and set sweep to ms div Connect channel 1 to TP7 Galvo Feedback on the Galvo PCA 8 On CHI a downward ramp will be displayed The shorter upward ramp is the retrace Use only R45 and R47 make the downward slope to be as straight as possible This is done by maximizing the peak to peak voltage without allowing any right facing curvature of the downward slope Increasing the peak to peak too much with R45 will cause right facing curvature near the middle of the downward slope Increasing the peak to peak too much with R47 will cause right facing curvature near the top of the downward slope If successful proceed to step 9 If you are unable to adjust this downward slope to be straight the Galvo PCA may be extremely out of adjustment In this case reset R47 and R45 to a predetermined starting position To reset R47 and R45 unplug all cables to the Galvo PCA including the Galvo itself The use an Ohmmeter to set the Galvo PCA to the setting in the chart below For orientation observe the PCA so that the PCB writing is from left to right Galvo PCA Ohmmete
27. by means of a 3 bit LUT bank select field and an Autoincrement Reset bit Accesses can extend beyond the selected bank the bank register will autoincrement also The DCB can interrupt at levels IRQ3 through IRQ7 jumper selectable There are four possible interrupt sources each one can be separately enabled and cleared LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION TO DATA AQUISITION IMAGE MEMORY ____ MEMADOK 4M X 8 ADDR DECODE DCDCOD ABL yo DECODE DCPCLK TDF DCDRAM TDF PIXCLK OPTIONAL DCCSR TDF I SCANCLK F4 FILMCLK Figure 4 6 Data Control Board 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 The Scan Clock is a continuous clock signal derived by dividing 10Mhz It is used to control the line scan repetition rate and to synchronize the beginning of each scan sweep Start of scan or SOS The actual linear rate during each sweep is controlled by the Data Acquisition board For the LS50 75 the Scan
28. clock is set for a 115Hz scan rate and should never be changed The Film clock is a continuous clock signal derived by dividing 10Mhz It is used as the reference for a frequency controlled servo motor driver which controls the film transport motor The Film speed is directly proportional to this frequency The Pixel Clock is a gated trigger signal derived from 40Mhz The trigger signal is sent to the DACQ during each scan line after the completion of the Delay to 1st Pixel count and until the completion of the Pixels per Line count The Delay to 1st Pixel counter counts the Pixel clocks beginning at SOS and terminating when its preset count is reached The Pixels per Line counter is enabled at the termination of the Delay to 1st pixel count and counts Pixel clocks terminating when its preset count is reached If enabled an interrupt request will be generated at count termination 4 9 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION The Lines per Image counter is enabled at the beginning of a scan and is incremented at the end of each scan line terminating when its preset count is reached If enabled an interrupt request will be generated at count termination The usual value for this counter is 65 535 maximum which effectively disables this control and permits the Isfilm signal to be used to control acquisition Interrupt Requests There are four possible sources for interrupt requests by the DCB Last pixel in line
29. default resources are IRQ 7 I O Address 120 and Segment Address D800 For DOS Windows95 98 systems if the Data Control Board is reconfigured to use different resources the TSR driver command line must reflect the change also Please see APPENDIX A for instructions on how to change the IRQ level the I O address or the 32 Kbyte window address For Windows NT systems if the Data Control Board is reconfigured to use different resources LSDT Control Panel must reflect the change also 2 3 6 Software Installation Tips ISA Interface 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 enclosed data disk The file format is CLUTXXXX DAT for digitizers with 4 digit Serial Numbers or CLTXXXXX DAT for digitizers with 5 digit Serial Numbers This file is installed in the C WINNT S YSTEM32 DRIVERS directory Although more than one different file of this format can be installed the LSDT Control Panel needs to specify which file is to be used for the particular digitizer in use 2 10 LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION B Installing the LSDT NT Software will create in the NT Control Panel a Device called LSDT 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
30. insure that the log amp is not latched in an unstable state Following this initial set a line of data is acquired with LEDs off and the middle 32 pixels are averaged If this is different from the desired minimum signal an A D count of 30 the Autozero output is changed in a binary fashion so as to drive the result toward 30 There are a maximum of seven binary steps 64 32 16 8 4 2 1 however if the desired count is reached before the end the process is terminated At the beginning of the Autozero sequence a 1 is written to image memory followed by the final result at the end of the sequence If for some reason the sequence does not complete the last value in image memory will be the 1 value The ISFILM AUTOZERO sequence requires two lines for the AGC adjustment five line times for the ISFILM threshold adjustment plus seven for the Autozero sequence At 81 lines sec the total time required is about 225ms Y Only and XY Pixel Averaging Modes The LS20 Data Acquisition board is capable of averaging pixel values together either in Y only or in both X and Y There is no X only averaging mode The mode bits are selected in the DACQ CSR In Y only mode two lines are averaged for each line of data produced For the 80hz net line rate there are actually 161 lines of acquisition per second with only every other line resulting in data Each data value is the average of two samples If the odd even pixel averaging on the CCD board is taken into acco
31. line and the total number of lines should be roughly proportional to the film dimensions As an example a 14 x 17 inch film digitized by an LS75 at the default resolution would be 2048 pixels per line and approximately 2500 total lines in the image If the total number of lines significantly differs from the proper ratio there is probably a Memory Segment conflict If the film halts mid scan or doesn t scan there is probably a Base I O Address conflict If the film goes all the way through the system without scanning there is probably an IRQ conflict 2 11 LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION DOS or Windows 3 x or Windows 95 98 1 It is necessary to have a Density Correction Lookup Table installed to achieve accurate density tracking This file is located on the enclosed data disk The file format is CLUTXXXX DAT for digitizers with 4 digit Serial Numbers or CLTXXXXX DAT for digitizers with 5 digit Serial Numbers This file is installed on the C root directory There can be only one file of this format installed at one time Also the file needs to match the Serial Number of the digitizer The TSR driver LSDTVXXX COM needs to be loaded for the digitizer to operate The driver is located in the C LSDT TOOLS directory 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
32. on the host system software the scanner configuration file may need to be modified using the serial interface SCSI Cabling The scanner has a 50 pin SCSI 2 connector Connect directly from the host interface card or another SCSI device SCSI ID and SCSI TERMINATION There is a small rotary switch on the back of the scanner next to where the SCSI cable is connected This switch selects both the SCSI ID and enables SCSI bus termination SCSI ID s range from 0 through 7 Every device on the SCSI bus must have a unique ID The switch rotates from 0 to F Switch values from 0 through 7 select SCSI ID value with bus termination DISABLED Switch values from 8 through F select SCSI ID value 8 with bus termination ENABLED For example if the rotary switch is set to C then the scanner will respond to SCSI ID 4 with the SCSI bus termination enabled Switch SCSI Termination position ID enabled 0 0 NAYDNDNBPWNFK DINDNFP WN KR 1 2 3 4 5 6 7 8 9 A B C D E F 10 2 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI 10 5 10 6 Hardware Configuration Normally no hardware configuration is required The microcontroller interface board has 4 jumpers JP1 JP2 JP3 JP4 Jumper JP1 is really a connector for a reset button if jumped the system will not run constant reset Jumpers JP2 and JP3 are used to configure the memory size Jumper JP4 enables the SCSI bus state indic
33. only The LS50 still scans 1024 pixels per line Appendix 5 EXTERNAL CPU SCSI OPTION HARD DRIVE CONFIGURATIONS Below are listed the various hard drives supplied with the ACER SCSI option The hard drive is shown as the formatted size The date is the approximate ship date Appendix 6 APPENDIX C LUMISCAN LSDT SAMPLE DENSITY FILE Sample Reference Density File Each Lumisys step wedge film comes with a sheet which lists the actual densities of each step in the film For each film a special file must be created which is then used by other programs Each film should be given a unique three digit serial number The simplest way to generate the file is to take a previous file and edit it using any text editor to change the serial number and density values as required Create the file In the TOOLS directory there is a density file template called example den Copy this file to a density file for your film CALSDTWNTOOLS copy example den denxxx dat where xxx is the last three numbers of the film serial number located on the top right of the density list for that film Change line one to your film number Change lines to first step to 0 0 for a 15 step film Leave 7 2 if you have a 32 step film Change lines of each wedge to 6 5 for a 15 step film Leave 2 9 if you have a 32 step film Delete all density values Enter the values for your film from the density list located in the envelope with the film Note For 32
34. or the PMT Tube can be replaced individually 8 3 1 PMT PreAmp 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 mis handled 1 Remove the PMT PreAmp assembley cover by removing the 2 pan head screws W 2 Remove the 3 cables going to the PMT Pre PCA 3 Remove the 4 mounting screws T from PMT Preamp PCA and remove the PCA 8 3 2 For PMT Tube Removal CAUTION If the PMT tube is being replaced then it must be handled VERY CAREFULLY Do not expose the PMT tube to direct light while the LUMISCAN is powered on 1 Remove the Main front and PMT Preamp covers 2 Dissconnect the cable going to the PMT PreAmp PCA 3 Using the 5 64 wrench remove the two hex screws H holding the PMT tube onto the optics module 4 Remove the PMT tube and socket G amp J 5 Remove the PMT tube from the socket 8 3 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 8 3 3 PMT Tube PMT Preamp Replacement Installation The installation of the board and PMT is the reverse of removal Note Clean the face of the PMT with alcohol before installation Adjustment amp
35. pin of Test Point 1 to the bottom pin of Test Point 1 on the PMT Preamp PCA The voltage with the beam directed to the center of the light collection chamber should be 6VDC or 8VDC depending on the chart in Chapter 5 If the voltage is just low but not zero volts the solution is merely to increase the PMT High Voltage If the PMT output voltage is zero volts check the PMT High Voltage input CAUTION THE PMT HIGH VOLTAGE IS SEVERAL HUNDRED VOLTS DIRECT CURRENT Using a DVM check the PMT High Voltage by measuring the voltage from the top pin of Test Point 2 to the bottom pin of Test Point 1 on the PMT Preamp PCA The voltage is normally 165VDC to 300VDC If the voltage is near zero volts the PMT High Voltage Power Supply is likely to have failed If the PMT High Voltage input is normal and there is still no PMT Output Voltage the Photo Multiplier Tube might have failed Check for bent pins on the cable from the PMT Preamp PCA to the Data Acquisition PCA Try a new PMT and or a new PMT Preamp PCA 7 2 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS 7 2 4 Low Photo Multiplier Tube Output Increase the PMT High Voltage input to get the proper PMT Output Voltage for a Laser directed at the center of the light collection chamber If it is necessary to adjust the PMT High Voltage higher than 350VDC to get the proper PMT output the PMT has aged and needs to be replaced Before replacing the PMT lower the PMT High Voltage to a more normal
36. position the film so that the beam is scanning across the middle of the black and white bars If this does not take place position the film by hand using the film drive belt Observe the monitor screen display LINEARITY ADJUST TEST v1 29 Lumisys Inc c 1994 06 05 95 09 43 58 System Serial Number xxxx Delta 122 122 124 126 126 127 126 127 126 125 124 122 121 122 Mak 1 2 3 45 6 7 8 9 10 1I 12 13 14 CAL 2 64 CAL 2 18 sum of Delta s 1740 average of Delta s 124 29 Number of edges found 15 11 Adjust Galvo Offset to center the beam 12 Adjust Galvo Span for the nominal Sum of Deltas 13 Adjust R47 to achieve the minimum value for the CAL value 14 Perform steps 11 and 12 15 Adjust R45 to achieve the minimum value for the CAL value 16 Perform steps 11 and 12 17 Adjust R47 to make the pixel counts of the first three deltas fairly equal 18 Adjust R45 to make the first 6 steps fairly equal 5 7 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 19 Adjust R47 and R45 slightly to improve the CAL and CAL values 20 Perform step 11 21 Adjust Galvo Offset to make delta 1 and delta 14 equal 22 Adjust Galvo Span to obtain the nominal Sum of Deltas 23 If the CAL CAL and Sum of Deltas do not meet the specification perform steps 11 through 23 again If the specifications are still not met perform steps 6 through 23 24 Change the combinations of switch positions on 1 PARK on the DACQ board whi
37. 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 Before beginning an investigation it is a good practice to record as much information about the current state of the system as possible This information may include but is not limited to symptoms conditions under which symptoms exist voltages settings cleanliness and visual state Normal generic troubleshooting techniques apply With knowledge of the system isolate the failure to a particular subsystem With knowledge of the subsystem trace the symptom back to its cause In many cases failures are caused by lack of periodic maintenance and cleaning If a system is known to be behind schedule for its maintenance and cleaning at the time of the failure it is a good practice to clean and recalibrate the system before extensive troubleshooting In many cases this solves the problem or provides clues as to the cause 7 2 Symptoms and Their Causes Here are some of the most common symptoms of system failures and some known causes 7 2 1 Film Not Detected When a scan is initiated the film may travel through the scanner without being detected or scanned The most common cause of this is no light output from the Laser To determine if the Laser is functioning remove the main cover and unplug power to
38. step density files enter densities 2 through 32 skip 33 then enter density 1 at the bottom of the file for a total of 32 densities Appendix 7 32 Step wedge 15 Step wedge Serial Number den002 dat Serial Number den002 dat lines to first step 7 2 lines to first step 0 0 lines of each wedge 2 9 lines of each wedge 6 5 30 05 44 25 59 50 74 75 86 1 00 1 00 1 50 1 14 2 00 1 27 2 50 1 40 3 00 1 51 3 20 1 63 3 40 1 74 3 70 1 85 3 90 1 95 4 00 2 04 4 20 2 13 2 21 2 32 2 42 2 51 2 51 2 66 2 75 2 81 2 87 2 94 3 01 3 04 3 15 3 22 3 29 3 42 Note For 32 step density files enter densities 2 through 32 skip 33 then enter density 1 at the bottom of the file for a total of 32 densities Appendix 8
39. that the reading of a single line of data occurs within the most linear region of a given Galvo motor sweep and that the edges of the film do not fall outside of the scan range The test film used in this adjustment has 14 evenly spaced bars of equal width R45 Damping and R47 Servo Gain on the Galvo PCA are used to adjust the rate of beam movement across the 14 bars so that the number of pixel samples on each bar is the same If the beam moves slow across a bar the number of pixel samples will be too high This error is quantified by the LNADJDT program as CAL Conversely too few pixel samples result in CAL error Galvo Offset is used to position the beam so that the 14 bars are centered in the beam span Galvo Span is used to adjust the beam span so that the sum of the 14 bar widths is a specified value called Sum of Deltas which is the sum of the pixel samples of the 14 bars The field specification for these parameters is as follows 75 Hz LS50 LS75 Cal 5 or less Cal 5 or less Sum of Deltas 1024 10 10 115Hz LS50 LS75 Cal 5 or less Cal 5 or less Sum of Deltas 1740 20 10 LS85LF Cal 5 or less Cal 5 or less Sum of Deltas 1740 20 10 LS85 Cal 5 or less Cal 5 or less Sum of Deltas 1882 20 10 Galvo Offset Potentiometer Galvo PCA V3A or prior R33 on the Galvo PCA Galvo PCA V3B or later R58 on the Data Acquisition PCA Galvo Span Potentiometer Galvo PCA V3A or prior R35 on the Galv
40. the LED Array boards The current to each segment is the same adjustable by means of a single potentiometer Under control of the DACQ board each of fifteen segments can be turned on or off plus all segments can be turned off or on at either full power or reduced power 9 4 5 LED Array Board The LED Array board is a building block board which contains three segments of six series connected LEDs each 18 LEDs per board The signal traces to each LED have a very large surface area which are intended to be thermally connected to large heat sinks thus allowing the LEDs to be driven at large currents with minimal temperature rise The LED Illuminator assembly consists of five of the LED Array boards arranged end to end and clamped between large heat sinks The LEDs radiate into a special integrating diffuser which smooths out variations among individual LEDs 9 3 LSDT SERVICE MANUAL SECTION 9 0 LS20 9 4 6 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 film is in the optical path i e ISFILM is true 9 4 8 Power Distribution The LS20 contains four integral power supplies A triple output linear supply provides 12 volts and 5 volts to the DACQ board One dual linear supplies 15 volts for the film transport A single 24 volt supply is used to generate 20 volts on th
41. the LUMISCAN covers Spray the soap or detergent on a soft clean cloth then wipe down the covers 6 2 Periodic Maintenance Maintenance Periods 2 to 4 times every 12 months WARNING IT IS IMPORTANT THAT THE LUMISCAN COVERS REMAIN ON THE SYSTEM AT ALL TIMES THE COVERS SHOULD ONLY BE REMOVED FOR SERVICE AND THEN IMMEDIATELY REPLACED THIS WILL MINIMIZE DUST ENTRY WARNING THIS EQUIPMENT EMPLOYS A LASER LASER RADIATION MAY BE PRESENT IF THE LUMISCAN LSDT IS OPERATED WITHOUT COVERS AVOID LASER BEAM DIRECT EYE EXPOSURE TO LASER LIGHT MUST BE AVOIDED LUMISCAN SERVICE MANUAL SECTION 6 0 PERIODIC MAINTENANCE 6 2 1 Vacuum interior Remove the LSDT covers and vacuum the inside Remove the fan filter and clean 6 2 2 Clean Optics NOTE The Optics should only be cleaned if vertical streaks appear in the image or negative spikes observed on the calibration curve See 6 5 Plot CAL Table Clean the beam splitter and the 45 degree folding mirror with a high grade alcohol 98 or acetone and Lens cleaning paper Wipe very lightly to avoid scratching the optic surfaces All mirrors in the optics are surface coated Refer to Figure 6 1 ALIGNM HOLE EAM SPLITTE Figure 6 1 Optics 6 2 3 Clean Laser Light Collection Chamber The Laser Light Collection Chamber can accumulate lint in the rectangular light input slot To remove this lint wipe the edges with lint free lens tiss
42. the outside or inside of the PMT Collection Cylinder diffusing tape Dust can normally be seen by removing the LS50 top cover and running option 10 in the diagnostic program DDT Without a film in stand at the rear of the LS50 and look at the Collection Cylinder through the center of the film chute Observe the laser beam scanning across the cylinder If there are any bright intensity spots it is probably due to dust on the outside or a paint chip on the inside of the tape If dust is on the outside of the tape try blowing it off with compressed air Cans of air are sold in Electronics and Camera stores If the debris is on the inside of the tape the Collection Cylinder must be removed and the tape replaced Replace the tape with 3M Scotch Brand Magic Tape 810 3 4 and trim excess off Other brands of tape will cause artifacts in the image Replace the tape as follows 1 Turn off power and remove the front cover Disconnect the two cables at the DACQ PCA so the cover can be set aside 2 Remove the PMT Pre Amp cover and disconnect the two cables 3 The Collection Cylinder is held in place by 4 screws on each side Remove these screws and lift the Collection Cylinder out On current systems the film guide is fastened to the Collection Cylinder and will lift out with it Remove the film guide from the Collection Cylinder by removing the 4 screws on each side See Assembly Drawing 4 Remove the tape Blow out the inside of the Colle
43. to utilize this mode This is also useful for testing the digital only portion of the system 9 11 LSDT SERVICE MANUAL SECTION 9 0 LS20 NOTE Modes 1 3 4 6 and 7 have specific purposes and should be used with caution It is recommended that for scanning an image Mode 5 should be used allow at least 64ms then stopped and the image acquired using Mode 2 Film Transport Motor Control The DTS film transport motor is a precision DC motor with a 256 count encoder The control for this motor is on the Data Acquisition board It is a frequency controlled servo amplifier with the reference frequency Filmclk coming from the DCB The linear film speed is directly proportional to the Filmclk frequency As with the galvanometer control this signal is always being generated by the DCB motor drive and direction are controlled by two DCB CSR bits Motor Enable and Film Reverse There are no adjustments to the film transport motor control circuit Speed is set by an input clock rate between 9khz and 16khz which accommodates the necessary range of film speeds When the Motor Enable bit is set to 1 the input clock signal is compared with a motor encoder signal The input clock signal causes a counter to count up the encoder rate signal causes the same counter to count down The residual count is converted to an analog voltage via a DAC to drive the motor When the motor encoder rate matches the desired input clock rate zero servo error and speed
44. word report of the results of the adjustment sequence The AGC Enable bit in the DACQ CSR must be set to 1 otherwise the AGC and Autozero adjustments will be bypassed and set to 0 the ISFILM threshold adjust is always performed When Mode 5 is selected and a scan is initiated one line is skipped then one line of data is taken under control of the DSP The maximum count is located and a voltage is output from the 8 channel D A converter which modifies the effective input gain in such a way that the peak A D counts in air are maintained at 30 The final result is written into image memory 0 counts corresponds to 5 00v 128 to Ov and 255 to 4 96v To adjust the ISFILM threshold the input signal is connected directly to the A D bypassing the log amp Four lines are taken with the DSP causing samples to be taken at the same delay from SOS that the actual ISFILM detection circuit uses 9 9 LSDT SERVICE MANUAL SECTION 9 0 LS20 The samples are averaged and a voltage is output to the ISFILM comparator that is 31 32 of this average signal The final result is written into the next image memory location Finally the Autozero adjustment is performed as follows First the Illuminator LEDs are turned off in order to produce the minimum input signal Next the Autozero output voltage is set to 0 preceded by a short period at maximum Autozero adjust voltage 4 96v This kickup voltage phase is included prior to each adjustment step in order to
45. 100 OFF 120 ON How to set this switch to achieve the desired address for a DCB3 BASE I O ADDRESS _S1 6 S1 7 100 OFF OFF 120 ON OFF 140 OFF ON 160 ON ON Appendix 3 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 APPENDIX B PRODUCT CHANGES AND ENHANCEMENTS All LSDT s after S N 5233 and 7243 will not have the diffusing tape installed on the collection cylinder This is made possible by a filtering algorithm in the firmware on the DACQ PCA This will eliminate the Service Calls due to debris on the tape The LS50 scan rate is now 115 lines per second instead of 75 Ips and the Optical Density range has been extended to 3 5 Because of the Firmware change the latest LS50 s will only operate with software V 2 5 or higher V 2 5 is downward compatible with older LS50 s since it reads the DACQ firmware revision when the LSDT Driver loads and operates the scanner at 75 or 115 Hz Other changes are 1 The PMT Preamp Offset is now set to 0 mV instead of 4 mV This improves the Signal to Noise Ratio 2 Resistors in the PMT Preamp have been changed and the PMT High Voltage is now set for 6 volts out of the Preamp instead of 8 volts This also improves the Signal to Noise Ratio 3 Due to the scan rate change the L 50 Sum Of Deltas in LNADJ is now set for 1740 instead of 1024 This is a Diagnostic number
46. 200VDC as a starting point for the new PMT 7 2 5 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 If your system doesn t have an HV control cable at AUX IO disable the PMT HV at the bulkhead connector This will protect the PMT from ambient light during the investigation Manually roll a 14 inch wide dark film in to the beam slot to serve as a backdrop for the Laser light Run DDT EXE option 10 to activate the Galvanometer If the beam is sweeping back and forth across the film the Galvanometer is functioning properly Disconnect the Galvanometer drive signal cable at the Data Acquisition PCA connector labeled GALVO Disconnect the other end of the same cable from the Galvo Driver PCA Use an oscilloscope to monitor the Galvo drive signal at the top pin of Test Point 6 on the DACQ PCA If there isn t a drive signal present the DACQ PCA is malfunctioning or is adjusted to zero Galvo span If there is a drive signal present connect the drive signal cable to the DACQ PCA while leaving the other end disconnected If the drive signal is lost the cable needs to be replaced If the drive signal is still present connect the drive signal cable to the Galvo Driver PCA If the drive signal is lost the Galvo Driver PCA needs to be replaced If the drive sign
47. 256 times the next 256k pixels have a repeating pattern of 1024 through 2047 the next are 2048 through 3071 and finally 3072 through 4095 Ona 1k x 1k display this appears as four horizontal ramps each 256 lines high the top ramp has values from 0 through 1023 the bottom ramp 3072 through 4095 Note It is necessary to have a display capable of displaying 12 bit images to utilize this mode This is also useful for testing the digital only portion of the system NOTE Modes 1 3 4 6 and 7 have specific purposes and should be used with caution It is recommended that for scanning an image Mode 5 should be used allow at least 64ms then stopped and the image the acquired using Mode 2 Galvo Control Control of the galvo in the LSDT is different from control in the LS100 200 series in that the basic sweep and retrace times are not programmable These parameters are fixed in firmware the PLD must be changed in order to change these parameters The present settings are 545 Khz up clock 7 509ms up ramp and step return to start no down ramp The Scanclk signal from the Data Control Board no longer controls the sweep speed The sweep speed is now fixed within the generation circuit DQFMGV GDF and can be changed only by changing the firmware The Scanclk signal now controls the repetition or line rate This is fixed for each model and should never be changed For the LSDT the Scanclk frequency is 10 000 000 10800 925 926Hz This signal is
48. 50 75 85 Configuration Guide P N 0071 434 LUMISCAN 20 Operators Reference Guide P N 0069 384 vi LUMISCAN LSDT SERVICE MANUAL INTRODUCTION SAFETY INFORMATION Conventions DANGER A DANGER indicates that personal injury to the eyes may occur if the user does not perform the procedure properly WARNING A WARNING 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 NOTE A NOTE indicates the information that should be called to the attention of the user Be sure to read and understand the installation and operating instructions before applying power to the LUMISCAN LSDT vii LUMISCAN LSDT SERVICE MANUAL INTRODUCTION Laser Safety The LUMISCAN LSDT LS50 75 85 85LF incorporates a 2mW Class IIIa Helium Neon laser The covers on the LUMISCAN LSDT protect the user from direct exposure to laser light These covers will protect a user only if they are properly installed when the system is being used Covers must be removed and replaced by properly trained personnel If the covers have been damaged during shipment or in usage contact your local service representative for replacement covers DANGER THIS EQUIPMENT EM
49. 6 DATA CONTROL BOARD 3 0068 855 GALVO DRIVER V5 0070 901 CCD BOARD 0069 593 CCD LED INTFC 0069 405 LED ARRAY 0070 061 INTERNAL SCSI 11 1 LUMISCAN SERVICE MANUAL SECTION 11 SCHEMATICS 0062 002 SPEED REDUCER ASSEMBLY 0070 164 GEARHEAD SPEED REDUCER 0068 450 ASSY FILM FEEDER APPENDIX A LUMISCAN 20 50 75 85 JUMPER AND SWITCH SETTINGS NOTE Not applicable to the Internal SCSI Option 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 Here s how to identify them Address Memory Base I O Memory Ver Size IR DIP Switch Address Address Size DCB1 Big 13 long JP1 S1 6bits Sl 1thruS1 5 S1 6 N A DCB2 Med 9 long JP2 S1 6bits Sl 1thruS1 5 S1 6 N A DCB3 Small 6 long JP2 S1 8 bits Sl 1thru S1 5 Sl 6thru SI 7 S1 8 Changing IRQ Level The LUMISCAN 50 75 85 is factory configured to use IRQ level 5 The IRQ level may be changed by setting a jumper on the Data Control Board JP1 or JP2 see table above To change the setting remove the jumper from its current position and move it to the desired level JPx see above table 00000 l 00000 34567 IRQ If the IRQ is changed from level 5 you MUST inform the driver when it is loaded This is accomplished by using a switch The switch is a forward slash such as used with MS DOS commands The format is Ix where x is the IRQ level For ex
50. ARTS Laser Power Supply Replacement To replace the laser power supply reinstall in the reverse order Refer to the appropriate Power Supply drawing to verify the wiring Realign the optical path as described in Chapter 5 GROMMET 3X STANDOFF B HIGH VOLTAGE CONNECTOR PMT P S D 3X SCREW AD 3X F WASH E RETAINER BRACKET 2X SCREW F LASER P S 65547 114 Figure 8 5 Laser and PMT High Voltage Power Supplies 8 10 LSDT SERVICE MANUAL SECTION 9 0 LS20 9 0 LUMISCAN LS20 9 1 Product Overview The LUMISCAN LS20 Scanner LS20 is a single sheet CCD film digitizer designed to digitize x ray film and measure optical density up to 3 20 O D The system is based on a fixed magnification ratio and is characterized by high spatial resolution and a wide gray scale dynamic range This is achieved with a high uniformity illumination system a wide dynamic range linear CCD array detector and superior electronics The transmitted light is collected and digitized to provide an image that can be stored on disk transmitted to other systems for processing and manipulation archived and or printed back onto film Figure 9 1 Lumiscan 20 9 System Configuration The configuration of the LS20 includes optics electrical and power supply assemblies PCAs for scanner control and data acquisition and a film transport assembly 9 1 LSDT SERVICE MANUAL SECTION 9 0 LS20 9 3 Optical Signal Path The LS20 opt
51. Autozero sequence At 115 lines sec the total time required is about 61ms X Only and XY Pixel Averaging Modes The LS50 75 Data Acquistion 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 Delay to Ist pixel is unchanged Thus the amount of data is reduced by two and the film speed should double in order to maintain a 1 1 pixel aspect ratio 4 14 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION In XY averaging mode two lines are averaged in addition to the pixel averaging described above Thus each data value is the average of four adjacent pixels 2x2 and the amount of data is reduced by four In this case the film speed is the same as for no averaging Operating Modes The operation of the DACQ is controlled by means of the MODE field in the DACQ CSR and the SCAN signal When SCAN is false the DCB can access the lookup table memory When SCAN is set to true the DSP reads the mode and performs the appropriate functions Currently seven operating modes are defined They are described as follows Mode 0 Not Used Mode 1 Scan With No Calibrate No Clut and No Upper limit This is a special mode used only in the generation of the Correction LUT In this mode the result is the direct A D output M
52. D Count with the tape blocking the beam should be set to greater than 4000 and less than 4030 this will correspond to approximately 2 3V on CHI or 0 1V for V5 DACQ PCA 11 Exit DDT remove the oscilloscope leads 12 Continue with Section 5 4 5 LS50 75 85 85LF Correction LUT Generation 5 5 FILM FEEDER ADJUSTMENTS From the C LSDT TOOLS directory type in dropfilm c It is not necessary to load any films Each time the Enter key is pressed the Film Feeder will attempt to drop a film If the pulse width is correct the reset lever will move up 5 times and not move on the sixth press of the enter key The sound for each film drop should be a distinct clunk The FDDUR pot on the DACQ PCA controls the pulse width of the drop film signal Find the entire range of the FDDUR pot that results in 5 distinct film drops attempts Then adjust FDDUR pot for the middle of that range 5 18 LUMISCAN SERVICE MANUAL SECTION 6 0 PERIODIC MAINTENANCE 6 0 PERIODIC MAINTENANCE System Maintenance is classified in two categories Routine Maintenance and Periodic Maintenance Routine Maintenance is normally performed by the system operator and periodic maintenance is performed by a trained service engineer 6 1 Routine Maintenance Maintenance Periods 6 to 8 times every 12 months 6 1 1 Clean Covers The outside covers of the LUMISCAN DESK TOP SCANNER should be cleaned with a mild soap or detergent Do not spray cleaner directly on
53. EM which can be used to identify potential open address locations in the range A0000 EFFFF FINDMEM has the following output format C LSDT TOOLS gt FINDMEM A000 0000 USED A000 0000 20 A800 0000 USED A800 0000 20 B000 0000 USED B000 0000 4D B800 0000 USED B800 0000 20 C000 0000 USED C000 0000 55 C800 0000 USED C800 0000 4D D000 0000 FREE D800 0000 USED D800 0000 5A E000 0000 USED E000 0000 B4 E800 0000 USED E800 0000 41 Appendix 2 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 Either S1 6 or both S1 6 and S1 7 are used according to the DCB model Ver Base I O Address DCBI S1 6 DCB2 S1 6 DCB3 S1 6 thru S1 7 Placing the switch or switches in the factory default position OFF position selects the FACTORY DEFAULT I O ADDRESS 100 Setting the switch or switches to the ON position selects I O ADDRESSES 120 140 or 160 according to the DCB model When not in the factory default position the B switch must be added to the driver load command For example LSDT TOOLS LSDTVxx B120 How to set this switch to achieve the desired address for a DCB1 or DCB2 BASE I O ADDRESS S1 6
54. HOST can t communicate with the LSDT verify the LSDT SCSI PCA switch is set for the proper SCSI ID and termination Systems shipped from LUMISYS have the switch outside rear of System set to C which is SCSI ID 4 terminated Settings 0 to 7 is for SCSI ID 0 to 7 without termination and setting 8 to F is SCSI ID 0 to 7 with termination The Internal SCSI PCA is located at the left rear side of the baseplate inside the LSDT There are four LED s located on the PCA that are normally disabled so as not to cause artifacts For troubleshooting purposes the LED s can be enabled by inserting a shorting jumper at JP5 on the PCA When polled LED s C D and BSY will blink When scanning the BSY I O and C D LED s will blink Remember to remove the jumper for normal operation 10 15 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI This page intentionally left blank 10 16 LUMISCAN SERVICE MANUAL SECTION 11 SCHEMATICS SCHEMATICS AND DRAWINGS PART NUMBER DESCRIPTION 0068 216 LS75 PRODUCT TREE METAL 0070 887 LS20 PRODUCT TREE PLASTIC 0070 676 LS75 PRODUCT TREE PLASTIC 0071 840 ASSY LS20 0071 860 ASSY LS75 0070 767 DIAG POWER WIRING LSDT 0070 878 DIAG POWER WIRING LS20 0071 373 DIAG SYSTEM INTERCONNECT LS20 0071 361 DIAG SYSTEM INTERCONNECT LSDT 0071 536 PMT PREAMP 0061 412 REFERENCE AMP 0067 654 DATA ACQUISITION LS50 0062 450 FILM MOTOR DRIVE LS50 0071 354 DACQ6 LSDT 0070 23
55. It is configured for 1 megabyte region beginning at address 0x2000000 CS4 selects the DRAM It is configured for a 16 megabyte region starting at address 0x0000000 CS6 selects the flash chip U10 It is configured for a 256k region beginning at address 0x00C0000 2 Interrupt Control Unit The interrupt control unit handles the external interrupts generated by the DCB section INT2 and the 53CF94 SCSI chip U26 INT3 3 Asynchronous Serial I O Unit Channel 0 of the asynchronous serial I O unit is used for the console RS232 level signals are generated with the MAX232 chip at U25 Video output and keyboard input are redirected to the serial port Connecting a terminal to this port allows a user to access the flash disk by entering DOS commands at the prompt This eliminates the need for separate video and keyboard controllers 4 Parallel I O Unit The I O port 1 is used to read the SCSI ID switch S1 5 DMA and Bus Arbiter Unit DMA channel 0 transfers data from the FIFO to memory DMA channel 1 transfers data from memory DRAM to the SCSI chip U26 and vice versa Both channels can also be used for memory to memory transfers The bus arbiter unit performs the necessary cycle stealing to perform the DMA operations 6 Refresh Control Unit The refresh control unit generates the periodic refresh requests and refresh addresses for the DRAM 10 5 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI 10 7 2
56. LUMISCAN LSDT SERVICE MANUAL LUMISYS LUMISCAN LSDT SERVICE MANUAL INTRODUCTION FOREWORD LUMISCAN LSDT SERVICE MANUAL P N 0061 501 Rev 07 Proprietary Notice and Disclaimer The information herein disclosed is the property of Lumisys Information in this document is subject to change without notice and does not represent a commitment by Lumisys to incorporate changes or improvements in units previously sold or shipped No part of this document may be reproduced or transmitted in any form electronic or mechanical including photocopying and recording for any purpose other than the purchaser s own use without the express written permission of Lumisys Copyright 2000 All rights reserved Trademarks Lumisys LUMISCAN 20 LUMISCAN 50 LUMISCAN 75 LUMISCAN 85 LUMISCAN 85LF and LSDT are the trademarks of Lumisys All other trademarks are the property of their respective owners and are hereby acknowledged Warranty One 1 year parts warranty For more information contact Lumisys 225 Humboldt Ct Sunnyvale CA 94089 408 733 6565 408 733 6567 FAX tech_support lumisys com January 2000 LUMISCAN LSDT SERVICE MANUAL INTRODUCTION This page intentionally left blank ii LUMISCAN LSDT SERVICE MANUAL INTRODUCTION TABLE OF CONTENTS INTRODUCTION iv Overview 1 0 PRE INSTALLATION 2 0 LUMISCAN INSTALLATION 3 0 SYSTEM POWER UP AND OPERATION 4 0 THEORY OF OPERATION 5 0 SERVICE
57. Last line in image Change in Isfilm film entering or leaving optical path and Event 0 which is used for the Abort switch Each can be independently enabled and cleared 4 10 LUMISCAN LSDT 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 The LS50 DACQ is optimized for digitizing up to 14 wide film with a resolution of 1024 pixels line 73 pixels inch and can accommodate increased resolutions with smaller films e g 128 pixels inch across an 8 film The file size of a 14 x 17 film is 1024 pixels x 1243 lines x 2 bytes pixel 2 545 664 bytes plus header The LS75 DACQ has twice the nominal resolution up to 2048 pixels line a 14 x 17 inch film when digitized will produce a file of approximately 10 182 656 bytes plus header Newer LS75 s version 5 and above have the ability to digitize 4096 pixels per line The LS85 LS85LF resolution is 4096 pixels line up to a 10 LS85 and 14 LS85LF wide film Most of the digital logic on the DACQ board is contained in two large PLDs and a DSP These are ICs which are SRAM based and must be downloaded with code before they become functional The DSP downloads or boots at power on and each time a DACQ function is initi
58. MTF at 1 0 1 5 and 2 0 line pairs per mm for the LS50 75 85LF For the LS85 the line pairs are xx xx and xx lines pairs per mm Also included in the MTF diagnostic is a Glare Test A high O D square surrounded by a clear background is scanned and a Glare is calculated The lower the 96 the better the system is responding Poor MTF and Glare results could be caused by dirty optics Verify that the following specification s are meet MTF Stouffer MTF method LS50 1 0 Ip mm X gt 32 1 5 Ip mm X gt 17 2 01p mm X 7 LS75 85LF 1 0 Ip mm X gt 45 1 5 Ip mm X gt 30 2 0 Ip mm X gt 15 LS85 2 0 Ip mm X gt 50 4 0 Ip mm X gt 25 8 0 Ip mm X 796 LS20 1 0 Ip mm X gt 30 1 5 Ip mm X gt 20 2 0 Ip mm X gt 10 Glare 5096 7 13 Y gt 45 Y gt 27 Y gt 9 Y gt 60 Y gt 55 Y gt 40 Y gt 50 Y gt 25 Y gt 8 Y gt 38 Y gt 30 Y gt 15 All Models LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS This page intentionally left blank 7 14 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 8 0 INTRODUCTION This section discusses the various components of the LUMISCAN LSDT film digitizer that can be replaced in the field It also details the removal of the LUMISCAN LSDT 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
59. N 4 0 THEORY OF OPERATION 4 4 Digital and Electrical Systems The electrical subsystem of the LUMISCAN LSDT 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 DATA ACQUISITION BOARD DACQ PMT COLLECTED INPUT PREAMP LIGHT amp LOG AMPS LASER EXTERNAL SWITCHES GALVO CONTROL DRIVER STATUS DATA CONTROL BOARD DCB 5 INDICATOR Kok 37 FILM MTR i DRIVE FILM MTR 8 j L INTERCONNECT CABLE DATA TIMERS CONTROL IMAGE BUFFER Figure 4 3 System Block Diagram 4 3 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION 4 4 1 Data Control Board All operations are controlled by the Data Control Board via means of control registers Although some of these registers are physically located on the Data Acquisition Board they are accessed through the Data Control Board Once a scan is initiated data acquisition is automatic requiring no intervention until the image has been written into image memory on the Data Control Board Image data can be transferred out of image memory during or after image acquisition 4 4 2 Data Acquisition Board
60. OOK UP TABLE Default is Normal LUT N Set LUT to normal 0 0 Optical Density 0 LUT I Set LUT to inverted 0 0 Optical Density 2 4095 OUTPUT FILE Default is Isdt img Note Some versions is 1s50 img F filename Set filename Tiff File Format TIF Set to create TIFF image file Film Feeder FF Set Feed Film to ON LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS If the user would like to scan a film into a file called image5 img using defaults from the MS DOS prompt type scanfile f image5 img This command will digitize a film using 12 bits 1024 pixels in width create a header and put a file named image5 img in the current directory The following series of Beeps will occur when the LSDT driver loads with errors Number of Beeps Reason 1 Driver Previously Loaded 5 Clut or CALCR file Failure e g File Missing File read error File Wrong Size etc 10 DCB not Present 15 DCB Memory Error 25 LUT Failure Reading or Writing to LUT Failed 7 12 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS 7 3 3 Modulation Transfer Function MTF MTF is a measurement of spatial resolution utilizing a special film 0067 989 for LS 50 75 85LF with line pair patterns For the LS85 use test film 0068 719 To test MTF insert the Lumisys MTF Pattern film into the film chute and run the batch file CHKMTF XXXX where XXXX is the last four digits of the system serial number The film will be scanned and the image analyzed for X and Y
61. PERATION 4 4 6 Power Distribution The LSDT contains five integral power supplies Two are high voltage supplies one for the laser and the second for the PMT 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 LASER POWER PMT PMT LINE PYS a1 PREAMP s 120vac 1 5a sB FILTER PCA 240VAC 1 0A SB 10CN 1 Zs J POWER 4 ENTRY GALVO Ps1 J3 pcA J2 J1 12V Ce ON OFF 60 487 SWITCH 5V SEZM4S 92A HTAA 16W A PS3 15V 0 8A HAA15 0 8A PS2 15V 1A HAA15 0 8A REF AMP PCA SWITCH 61494 403 Figure 4 4 LUMISCAN 50 75 85LF Power and Electrical System 4 5 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION D LASER 5557 NR 0068 476 PMT js FA 0064 365 2 a ID 0065 335 o PREAMP js 0057 324 7 120VAC 1 5A SB FILTER uk PCA 1 240VAC 1 0A SB 0055142 10CN 1 5557 NP J32 ca C 1 POWER c3 ERR 0065 319 4 GALWO f Ps1 2 F His Pca 32 J9
62. PLOYS A LASER LASER RADIATION MAY BE PRESENT IF THE LUMISCAN LSDT IS OPERATED WITHOUT COVERS AVOID LASER BEAM DIRECT EYE EXPOSURE TO LASER LIGHT MUST BE AVOIDED LUMISYS INC LUMISYS INC wmm 225 Humboldt Ct 225 Humboldt Ct Sunnyvale CA 94089 e o nyvale CA 94089 LUMISCAN GPs Ag Ce ce aa e 0070 396 REV 03 3 2 3 3 9 Fi 315mA 250V S B F2 315mA 250V S B LE Lumiscav 50 eto pou F3 315mA 250V S B F4 315mA 250V S B F5 1A 250V S B RUE IE Lumscan 75 x 0048 140 Rev oa t y A 250V lE Luwscan85 9060600 515mA 250V S B 315mA 250V S B F3 315mA 250V S B F4 250mA 250V S B F5 1A 250V S B NN HI POT TEST COMPLETE Figure I 1 LUMISCAN 50 75 85 Labels viii LUMISCAN LSDT SERVICE MANUAL INTRODUCTION INPUT ria eure LUMISYS INC UMISYS INC AC LINE VOLTAGE SELECTOR SERIE AR 225 Humboldt Ct SEE INSTALLATION INSTRUCTIONS Sunnyvale CA 94089 LUMISCAN Sunnyvale CA 94089 BEFORE CONNECTING POWER CORD LUMISCAN CAUTION FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE ONLY SR WITH SAME TYPE AND RATING OF FUSE K Re C FUSE 100 120 INPUT S B 2 04 250V 9 N 220 240 INPUT S B 1 0A 250v LISTED d LR91075 CAUTION DOUBLE POLE NEUTRAL FUSING LR91075 0068 539 REV 05 N 0069 230 REV 03 0070 396 REV 03
63. Q PCA adjust R84 OFFSET located in the lower left corner to obtain in the minVal pixel column the decimal value of 30 2 as displayed on the computer monitor 5 Re connect the cable on J3 of the LED PCA 6 Proceed to 9 6 1 LS20 Density Accuracy Verification 9 6 1 LS20 Density Accuracy Verification Note If the Data Acquisition PCA has been replaced a new Correction Lookup Table needs to be generated To create a new Correction Lookup Table proceed to section 9 6 3 LS20 Correction LUT Generation This density verification compares measured optical densities to actual densities A step wedge film see below is required along with a text file which contains dimensional information and the actual measured densities for each step See Appendix C for the definition of this file STEPWEDGE REQUIRED LS20 50 75 32 step Stepwedge 3 8 od P N 0068 749 LS50 75 85 85LF 15 step Stepwedge 4 2 od P N 0068 874 The process of density verification is simplified by the use of a batch file CHKCLUT BAT which reads the step wedge film and the reference file and compares measured optical density with actual optical density 1 Place the step wedge film into the film input slot with the notch on the top right Enter the following command line chkclut xxxxx yyy where xxxxx is the serial number of the machine as an example 2124 7007 or 10064 and yyy is the last three digits of the filename of the reference density file Note If an erro
64. Ref Amp sensor 3 1st 45 Degree Folding Mirror Use the two positioning screws on the corner mirror so that it deflects the beam 90 degrees to the center of the lens assembly 4 Lens Assembly Use the two positioning screws on the corner mirror to ensure that the beam passes through the center of the lens 5 Galvo Scanner Use the two positioning screws on the corner mirror to ensure that the laser beam is centered on the Galvo mirror 5 3 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 6 Folding Mirror Disconnect the J3 power cable to the Galvo PCA Place a target on the opening of the film guide centered in the 15 collection cylinder opening Ensure that the beam is horizontally centered 0 5 inches If not rotate the Galvo Motor or the Galvo Mirror to achieve center Re connect the Galvo PCA power Start the scan by running DDT option 10 See Diagnostics Adjust both the up down and the tilt adjustment screws which are located on the folding mirror until the beam is centered and parallel in the film guide Remove the Galvo PCA power again the verify horizontal center If the beam is not centered within 0 5 inches start step 6 over again Reconnect Galvo PCA power MIRROR ALIGNME HOLE EAM SPLITTE Figure 5 2 Optics 5 4 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 5 3 Scan Linearity Adjustment This adjustment will assure
65. Requirements HARDWARE REQUIRED 1 386 486 computer with keyboard and monitor 2 DCB Interconnect cable LSDT PN 0062 052 as Data Control PCA DCB 4 Oscilloscope 50 Mhz dual trace or better 6 Digital Volt Meter DVM 7 Imaging workstation 8 Lumisys LINADJ test film PN 0068 53 1 0068 783 LS85 9 Lumisys step wedge film with od data file PN 0068 749 LS20 50 75 PN 0068 874 LS50 75 85 LS85LF 10 Set of Standard Screw Drivers Flat blade philips 11 Small Screw Driver Tweaker 12 Hex Driver Set 5 16 thru 050 13 Photographic Dark Cloth Cover 14 Diagnostics SOFTWARE REQUIRED Every system requires the driver to be loaded before the scanner will function When the driver loads it calls a Correction Look up Table CLUT file For DOS Win95 installations there must be only 1 CLUTXXXX DAT file in the CA directory Note for 5 digit serial numbers the file format will be CLTXXXXX DAT For WinNT installations the correct CLUTXXXX DAT file must be specified in the LSDT Control Panel and the CLUTXXXX DAT must be present in the CA amp SYSTEMROOT amp S YSTEM32 DRIVERS directory All diagnostics required for the system are contained in the sub directory C LSDT TOOLS for DOS Win95 and C NTLSDT TOOLS for WinNT For a complete list of the diagnostics and their functions See Section 7 5 1 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 5 2 Optics This procedure contains complete field optical alignment ins
66. SCAN LSDT should be allowed to warm up for 5 minutes prior to use in order to stabilize the system 3 1 LUMISCAN LDST SERVICE MANUAL SECTION 3 0 SYSTEM OPERATION 3 2 Film Handling and Loading Processed x ray films that are to be digitized should be handled carefully to avoid introducing scratches excessive fingerprints and or static To digitize a 14 x 17 film insert the film into the film input chute as shown in Figure 6 1 The film should be loaded top end in with the viewing surface of the film facing the machine To digitize smaller films such as an 8 x 10 insert the film into the film input chute as before but with the film centered within the chute VIEWING SURFACE Figure 3 2 Film Loading 3 2 LUMISCAN LDST SERVICE MANUAL SECTION 3 0 SYSTEM OPERATION 3 3 Scanning A Film Once a film has been placed into the film input chute the user may initiate a scan Once started the film will be moved into position the edges found and the film digitized To digitize a film you may use the SCANFILE EXE sample application From the MS DOS prompt simply type SCANFILE lt cr gt A film will be digitized using all default parameters and the results placed in a file called LSDT IMG 3 4 Removal of Film Jams If a jam occurs or the user wishes to stop a scan in process press the SCAN ABORT button located near the film input chute See Figure 3 1 When the SCAN ABORT button is pushed the software driver i
67. SER FOR SCANNING DO NOT LOOK DIRECTLY AT THE LASER LIGHT 2 1 1 Tools Required A 7 16 open end wrench and a large flat blade screw driver are required 2 1 2 Unpacking the LUMISCAN LSDT Using the large screw driver remove the clamp brackets from the bottom of the crate Lift the crate off the pallet Remove the accessories box Remove the plastic bag protecting the system Using the 7 16 open end wrench remove the 4 bolts from each corner of the pallet underneath the LUMISCAN LSDT With TWO PEOPLE lift the LUMISCAN LSDT off the pallet To install the LUMISCAN LSDT follow the Hardware Installation Procedures LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION 2 20 Hardware Installation 2 2 1 Tools Required 1 flat head screwdriver 2 2 2 AC Voltage You must verify that the LUMISCAN LSDT is set up for the correct AC line voltage This can be checked by looking at power configuration panel which is located just to the right of the power entry plug next to the on off switch in the rear of the machine The LUMISCAN LSDT is set for 120 VAC for domestic units See Figure 2 1 If the LUMISCAN LSDT is to be operated at another line voltage the programming card must be changed First remove the plastic cover over the fuse and programming card Remove the voltage programming card and rotate it until the desired voltage is pointing inward rotate the voltage indicator to point outward and reinsert the card Replace the plastic
68. The Data Acquisition Board performs all the signal conditioning and data acquisition functions including calibration and lookup table functions 4 4 5 PMT PreAmp Board The PMT PreAmp Board contains the first stage preamplifier This board provides power connection a high voltage divider network for the PMT tube and a first stage amplifier for the PMT signal 4 4 4 Galvanometer Board The Galvo board contains a high accuracy feedback servo amplifier for controlling the position of a mirror mounted on the shaft of a scanning galvanometer Position feedback is from a sensor integral to the galvo The galvo motor shaft oscillates back and forth through an arc of approximately 30 degrees at a rate of 115Hz A small mirror attached to the shaft intercepts the static laser beam and sweeps scans it across the width of the X ray film Since the feedback signal from the galvo is proportional to angle the reference waveform from the DACQ board is shaped to compensate for the geometric distortion which results from sweeping across a flat surface Proper performance of the Galvo PCB is dependent upon the adjustment of several of its potentiometers 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 film is in the optical path LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF O
69. a bus status signals from the DACQ and control signals from the DCB The DACQ is a slave in all data transfers There are two types of data transfer DACQ register R W and DCB image memory write during data acquisition During data acquisition the DACQ signals the DCB when a data word is available DATAV AIL and then the DCB reads the data a byte at a time over the interconnect writing it to the image memory with the autoincrement address counter setting the address The signal SCAN must be true for data transfer to occur which is automatic Also the status signal ISFILM must be true in order for the DACQ to assert DATAVAIL DACQ register access includes the DACQ CSR and the Cal LUT autoincrement memory SCAN must be false for this to occur 4 17 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION 4 5 3 PMT PREAMPLIFIER The preamplifier is the interface between the PMT receiving the laser energy 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 The input power is filtered at the amplifier and reverse bias diodes are provided to protect the circuit against improper connections of the input power High voltage from a PMT supply is divided in 5 equal differential voltages and use
70. age results in greater than 1MB of data the software application must be able to read the data sufficiently fast so that it never lags behind the data writes by as much as IMB DCPCK2 TDF Figure 9 4 Data Control Board Image memory is accessible through a 32KB window This window can be positioned on any 32KB boundary within the standard 1MB DOS address space by means of five DIP switches on the DCB Memory page selection is accomplished through a Bank register The image memory is accessible at all times including during image acquisition An arbiter controls access giving the data writes priority over bus access If necessary the PC bus IOCHRDY signal is asserted to delay the bus access The image memory should never be written to from the bus during image acquisition During image acquisition a separate 20 bit counter selects sequential byte addresses for each data write counting always starts at address zero Address counting is only enabled when SCAN is true and is reset to 0 whenever SCAN changes from false to true The counter can be read at any time 9 5 LSDT SERVICE MANUAL SECTION 9 0 LS20 The control registers are mapped into the I O addresses 100 hex through 117 These locations are fixed and can be changed only by changing the firmware A newer version of the DCB known as the DCB2 allows the selection of an alternate mapping of the I O registers by means of a DIP switch The alternate m
71. al is still present verify with a DVM that the Galvo Driver PCA is receiving its input voltage of 15VDC and 15VDC This can be measured at L1 and L2 on the Galvo Driver PCA If the Galvo Driver PCA is receiving its proper input voltage attach the oscilloscope to the junction of R66 and R67 on the Galvo Driver PCA If there is a drive signal detach and reattach the Galvanometer If the Galvanometer still doesn t function it needs to be replaced If there is no drive signal to the Galvanometer the Galvo Driver PCA needs to be replaced 7 3 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS 7 2 6 Stretched or Compressed Images If images are either stretched or compressed on the Y axis and there is no loss of data on either edge of the image it is likely that the Film Motor Encoder has failed or that the beam span is improper Verify the beam span by performing the Scan Linearity Adjustment described in Chapter 5 section 5 3 If the beam span is proper and the Y axis is still stretched or compressed the Film Motor Encoder likely needs to be replaced If the images are stretched on the Y axis and there is data missing on either side of the images it is likely that a piece of lint in the light collection chamber opening is being falsely detected as a film edge If the images are compressed on the Y axis and there is blank data on either side of the images it is likely that a piece of lint in the light collection chamber is being falsely d
72. al number of the machine e g 7007 and yyy is the last three digits of the filename of the reference density file Verify that the following specs are met Slope Min 0 975 Max 1 025 Intercept Min 0 040 Max 0 040 R R Value Min 0 9993 9 21 LSDT SERVICE MANUAL SECTION 9 0 LS20 Scan Linearity Check 1 Place the Lumisys LINADJ test film in the input chute with the widest bar to the left nearest the Abort button and run the LNADJDT program 2 Observe the monitor screen display LINEARITY ADJUST TEST v3 0 Lumisys Inc c 1993 1996 02 14 96 09 43 58 System Serial Number 2026 Delta 144 146 145 147 146 147 147 147 147 147 147 146 147 144 Marks 1 2 3 4 5 6 7 8 9 10 II 12 13 14 CAL 1 51 CAL 0 54 sum of Delta s 2047 average of Delta s 146 21 Number of edges found 15 Check to see if the following specifications are met LS20 Total Pixels per Line 2048 6 Cal 5 or less If the systems fails perform the Linearity Adustment 9 22 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI 10 0 LSDT INTERNAL SCSI 10 1 Product Overview The LSDT INTERNAL SCSI Option is composed of a standard LSDT scanner with an embedded microprocessor based controller that provides the interface between the DACQ board and a SCSI host computer It contains the functions of the DCB board and the NCR SCSI board These functions are controlled by a 386EX processor running under DOS The unit s exter
73. ample to install the driver using IRQ 6 from the MS DOS prompt you would enter LSDTVxxx I6 Appendix 1 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 NOTE If the DCB is changed from its default address of D0000 you must add the Mxxxx switch to the driver load command to provide the driver the new 4 digit SEGMENT ADDRESS The command would like this C ALSDT TOOLS LSDTVxx ME000 The following table shows how to set this switch to achieve the desired address ADDRESS S1 1 S1 2 S1 3 S1 4 S1 5 COMMENTS A0000 ON ON OFF OFF OFF Normally used for VGA Cards A8000 OFF ON OFF ON OFF Normally used for VGA Cards B0000 ON OFF OFF ON OFF Normally used for VGA Cards B8000 OFF OFF OFF ON OFF Normally used for VGA Cards C0000 ON ON ON OFF OFF Normally used for VGA Cards C8000 OFF ON ON OFF OFF D0000 ON OFF ON OFF OFF Default Setting for DCB D8000 OFF OFF ON OFF OFF E0000 ON ON OFF OFF OFF E8000 OFF ON OFF OFF OFF NOTE If the address is changed care must be taken to select an address range which is not being used by another device The most significant bit of the address is controlled by switch position S15 Lumisys supplies a utility program FINDM
74. apping is 120 hex through 137 In addition to image memory there are 64KB of memory on the Data Acquisition board which are accessible through the DCB This memory is where the calibration and lookup tables are located and is fully R W accessible but only while not scanning Access is sequential through a 16 bit I O register The memory is organized on the Data Acquisition board as eight tables of 4K x 16 bits each The sequential access can begin at the beginning of any one of the eight tables by means of a 3 bit LUT bank select field and an Autoincrement Reset bit Accesses can extend beyond the selected bank the bank register will autoincrement also The DCB can interrupt at levels IRQ3 through IRQ7 jumper selectable There are four possible interrupt sources each one can be separately enabled and cleared 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 Ist pixel count Pixels per line count and Lines per image count These are each described briefly below The Scan Clock is a continuous clock signal derived by dividing 10Mhz In the LS20 it is used in the generation of the CCD timing signals It is set for 5 00Khz and should not be changed The Film Clock is a continuous clock signal derived by dividing 10Mhz
75. as arrived at the optical path The 16 lines are averaged and written into the Calibration Table by the DSP Unlike the other LUTS the input to the Calibration LUT is the pixel number or location 4 13 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION The Output LUT is for user use and depends on the application The default table is a 1 1 Lookup Table It can be replaced by an inverse 1 1 a 12 bit to 8 bit mapping or any other desired function Automatic Gain and Isfilm Detect Threshold Adjustment Automatic gain adjustment AGC is performed whenever a DACQ mode 5 command is received The DACQ Mode 5 is a special mode exclusively for the automatic adjustment of the input gain of the logarithm amplifier as well as automatic adjustment of the ISFILM threshold No data is generated in Mode 5 The galvanometer must be scanning The AGC Enable bit in the DACQ CSR must be set to 1 otherwise the AGC adjustment will be bypassed and the adjustment set to 0 the ISFILM threshold adjust is always performed When Mode 5 is selected and a scan is initiated one line is skipped to allow the galvo to stabilize then one line of data is taken under control of the DSP The maximum count is located and a voltage is output from the 8 channel D A converter which modifies the effective input gain in such a way that the peak A D counts in air are maintained at 30 For versions using DACQ P N 0070 197 and up the method for AGC is changed so that th
76. ata Acquisition Board The Data Acquisition Board DACQ performs all the signal conditioning and data acquisition functions including calibration and lookup table functions It also provides the control signals required by the CCD array sensor and the LED illuminator and the servo controlled driver for the film transport motor 9 4 3 CCD Board 9 2 LSDT SERVICE MANUAL SECTION 9 0 LS20 The CCD Board contains the CCD array sensor and power and signal conditioning It provides seven regulated voltages required by the CCD sensor as well as the digital interface circuits and the analog signal conditioning The necessary timing signals are received from the DACQ board and converted to the proper voltage levels The CCD sensor is a 6000 element linear array with alternating odd even signal elements pixels brought out in parallel to separate outputs These are summed together and then fed to a Correlated Double Sampling circuit Thus the maximum number of pixels possible per line is 3000 The Correlated Double Sampling allows the signal for each pixel pair to be referenced to its own dark reference in order to minimize signal variations due to thermal noise Data Acquisition Board DACO Data Control Board DCB2 T Lens Fin LED Array Indicator Board Figure 9 2 Signal Interconnect 9 4 4 LED Interface Board The LED Interface Board contains fifteen constant current drivers for providing controlled power to each segment of
77. ated However at power on and after the DSP boots it then also downloads the two PLD s with their code If for some reason the download fails to complete the board will be nonfunctional 4 11 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION OFFSET T ZERSEL Y i4 Lol T T LOG C Eo ai P i SLOPE I j MEE 4 uv zepz VOZER MULTI CHAN SERIAL D A DODCTL ISFILM e 5 g EXT EVENT X6 2 ZER3 ISFILM DIAG SELECT ZERSEL gt DQCLDG DIAG SELECT J8 g GALVO DRIVER 2X10 JP4 CENTER VCC e ey 5VA J6 VCC SCAN M INDICATOR L PROGRAMMABLE DEVICE SNVREF 1X5 J1 FILM MOTOR RUV brive x5 5VA 5VREF Figure 4 7 Data Acquisition Board DACQ Signal Conditioning The analog signal path consists of two logarithmic amplifiers for the detector signal and reference signal respectively The output from the reference log amp is subtracted from the signal log amp output so that variations in the detector signal due to laser power variations are canceled The log amps are a special type that does not depend on a semiconductor junction but rather a resistor ladder network They have inh
78. ator LEDs When JP4 is enabled the LEDs show the current SCSI bus state Since the LEDs are located inside the scanner they are only used for trouble shooting WARNING If JP4 is enabled the LEDs will cause stray light that will adversely effect the image quality System Memory Configuration Jumpers JP2 JP3 A Memory size 1 2 1 2 1MB 1MB is NOT enough to run the scanner 2 3 1 2 4MB 2 3 2 3 16MB Scanner Configuration LSDTCONF DAT The scanner has several minor configuration options The file D LSDTCONF DAT on the internal controller defines all user configuration options There are 7 option parameters protocol inquiry type target SCSI ID wait for digitize mode film present and request sense length The meaning and syntax of each parameter is described in the following sections The factory default settings are correct for the majority of users Example LSDTCONF DAT file Protocol LUMISYS LUMISYS or ANSI Inquiry_Type ANSI LUMISYS or ANSI TARGET_SCSI_ID 4 from 0 through 6 are valid WAIT FOR DIGITIZE FALSE either TRUE or FALSE TRUE gt more like LS150 200 MODE NORMAL INTERRUPTABLE NORMAL INTERRUPTABLE returns busy on image data reads when no data is available Host must retry NORMAL holds the SCSI bus until data is available FILM PRESENT NO TRUE or YES if sensor present REQ SENSE LENGTH 0 Non Zero overrides re
79. changed if necessary These settings are hardware selectable on the DCB 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 If these resources are used it isn t necessary to change the LSDT Control Panel The most common alternate DCB resources are Segment Address D800 IRQ 7 and Base I O 120 From the LSDT Control Panel select the CLT file matching the Serial Number of the Unit To verify the driver is installed properly perform the following steps Go to a COMMAND prompt Navigate to C LSDT32 TOOLS Insert a film Run the SCANFILE EXE program At the end of the scan the number of pixels per line and the total number of lines should be roughly proportional to the film dimensions As an example a 14 x 17 inch film digitized by an LS75 at the default resolution would be 2048 pixels per line and approximately 2500 total lines in the image If the total number of lines significantly differs from the proper ratio there is probably a Memory Segment conflict If the film halts mid scan or doesn t scan there is probably a Base I O Address conflict If the film goes all the way through the system without scanning there is probably an IRQ conflict Windows NT prior to NT driver disk 2 00 1 5 It is necessary to have a Density Correction Lookup Table installed to achieve accurate density tracking This file is located on the enclosed data dis
80. cover and ensure the indicator is pointing to the correct line voltage The LUMISCAN LSDT will is now set for operation 200 240VAC configuration requires removing and inverting the Corcom fuse module Use a small screwdriver to pry out the fuse module Loosen the philips head screw and remove and invert the fuse block and tighten the screw Two each 1 Amp 250V 5mm x 20mm Slo Blo fuses should all ready be installed if not install them Replace the plastic fuse cover Verify the voltage programming card is set to the desired voltage Note The fuse in the LUMISCAN LSDT for 100 200 volt operation is a 1 5 Amp 250 75 volt Slo Blo fuse Lumisys Part Number 0065 513 The fuses used for 200 240 volt operation are 1 0 Amp Slo Blo fuse Lumisys Part Number 0068 487 2 23 Power Cable The LUMISCAN LSDT utilizes an international IEC grade connector for the power cable Systems are shipped with a standard NEMA 5 15 hospital grade cable This cable requires replacement depending upon the country of installation Insert the female end into the input power socket LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION INTERFACE CABLE ON OFF SWITCH POWER IN 120V POSITION POWER CORD Figure 2 1 Power Switch Location LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION 2 2 4 Installation of Data Control Board DCB ISA Interface On the rear panel of the digitizer will be an ISA Interface connector or a SCSI I
81. ction 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 The last few lines will remain on the screen Verify that the last line is FRO FF FF2 FF3 FF4 FF5 FF6 FF7 FF8 FF9 FFA FFB FFC FFD FFE FFF followed by a return to the menu Test Digital only Data Path From the DDT menu choose 11 Change Parameters and then 6 Lines Per Image and enter 1024 Return the the main menu and select 13 Diagnostic Scan From the submenu choose 7 Diagnostic Pattern In response to the query Do overlapped writes to a LSDT IMG default y just press Enter Wait for the return to the main menu This causes the DACQ under test to generate a test pattern consisting of 256 lines of data values 0 through 1023 followed by 256 lines of data values 1024 through 2047 and so on 7 9 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS From the DDT menu enter the following command line H12 the following line will appear hist12 O0 Isdt img 1024 1024 0 2048 more This executes the program HIST12 which counts the number of occurrences of each data value in the range 0 through 4095 any displays the results on the screen which you can pause by hitting lt c
82. ction Cylinder with compressed air 5 Pull a long strip of tape off the roll in a continuous steady motion so as to not have any lines on the tape Place the tape tightly over the Collection Cylinder opening To avoid fingerprints on the tape use lens tissue to press it into place 6 Reassemble 8 7 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 8 8 Linear Power Supply s The linear power supply module in the LUMISCAN contains several off the shelf integrated power supplies The physical layout of the power supply module is shown in the following Figure Figure 8 4 PS1 PS2 and PS3 8 9 PMT Power Supply 1 Detach PMT P S from the frame by removing mounting screws 2 Detach the I O cable from the bottom of the PMT P S by removing two screws 3 Install new PMT P S in reverse order 8 8 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 8 10 Laser Power Supply 1 2 Remove the scanner cover Remove the 2 wires going to the AC terminal block TB1 5b and TB1 13b Use a small screwdriver to loosen the screws to remove the wires Remove the green yellow ground wire from the chassis ground located at GS1 using a 5 16 nut driver Remove the two 6 32 screws on the retainer bracket E that holds the high voltage connector on the frame side Remove the 3 screws from the laser power supply and remove the power supply 8 9 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT P
83. d to bias the cathode and 4 dynodes of the PMT 4 5 4 REFERENCE AMPLIFIER LS85 85LF only The Reference Amplifier ensures that variations in the light detected by the PMT are properly interpreted as changes in film density rather than changes in laser light intensity The Reference Amplifier constantly monitors the intensity of the raw laser beam through a beam splitter The Ref Amp sends correction signals proportional to the laser intensity to the DACQ PCA These signals are summed with the pixel values being read through the film so that a given pixel value remains constant regardless of the laser output variations Power for the Ref AMP is supplied via the cable connected to J1 from the DACQ PCA 4 5 5 GALVANOMETER SYSTEM The galvanometer PC board provides the drive and feedback signals necessary to control the position of the beam deflection mirror on the galvanometer shaft The drive waveform is received from the DACQ board This signal is used to drive a feedback amplifier The position feedback signal is received from the position detector which is integral to the galvanometer 4 18 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 5 0 SERVICE ADJUSTMENTS 5 1 Purpose This section covers the LUMISCAN components that can be adjusted in the field NOTE See Section 9 for the LS20 adjustments The following equipment is required for any alignment or adjustment performed in this section of the service manual
84. delay is sampled and averaged then the threshold is set to 31 32 969 of this result ISFILM detection occurs on the non log signal this corresponds to a minimum detection threshold of approximately 014 OD Acquisition Control The data acquisition process begins with the initiation of an A D sample of the output of the log amplifiers Control is primarily by the DSP device DQDSP DSP in conjunction with PLDs DQCTRL TDF and DQDSPIF TDF A pixel acquisition sequence is initiated by each PIXTRIG signal from the Data Control Board The function performed for each pixel depends on the Mode which is selected in the DACQ CSR see 9 5 2 8 During acquisition the functions may include a calibration step from one to three lookup table steps and a check of the data against upper and lower limits 9 8 LSDT SERVICE MANUAL SECTION 9 0 LS20 In all modes except Mode 5 and during calibration the acquisition process ends with the writing of data into the output registers 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 four possible lookup table functions are Correction LUT Calibration LUT Smoothing LUT and Output LUT The Correction LUT is used to correct any deviation of the logarithmic amplifier from a true logarithmic character
85. directory and its name must be specified in the LSDT section of the Registry Since the name is specified multiple CLUT files may be stored in the same directory See detailed installation instructions in the DOS and Windows NT sections below PRECAUTION If the driver does not find the CLUT file a warning will be given see below and the driver will default to a 1 1 Correction LUT i e no correction will be applied What this means is that although the digitizer will function and generate an image its quality will be affected LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION 2 3 3 DOS Windows 3 x and Windows 95 and Windows 98 ISA Interface To install the software place the floppy distribution disk in drive A From a MS DOS prompt type a install and then follow the instructions The installation software will create a directory on the hard disk and transfer the required software from the floppy disk to the hard disk As part of the installation the CLUT file CLUTXXXX DAT or CLTXXXXX DAT is copied from the floppy data disk into the root directory CX Be sure to remove any and all other CLUT files from the root They can be stored elsewhere just not in the root NOTE If when the driver loads no CLUT file is found or multiple CLUT files are found in the root the driver will default to a 1 1 Correction LUT and it will audibly beep The device driver LSDTVxxx COM where Vxxx is the version number must
86. e CCD board and a single 12 volt supply powers the LED Array boards through the LED Interface board 0069 507 LED 12V 9069 525 J2 INTRFC PCA 0065 319 H812 1 7 A J3 J2 SOR p SENS 120VAC 1 5A SB FILTER 0058 142 PCA 240VAC 1 0A SB Ji J POWER FAN ENTRY 0069 598 PS3 ON OFF 0069 522 SWITCH T20V SEZM4S HB24 1 2 A PS2 0069 521 t15V HAA15 0 8A F 0069 566 0069 520 0069 500 HTAA 16W A 4o F 0062 044 37 37 10 U pce 0062 052 j4 STATUS LED 0068 806 ABORT SWITCH jj FILM DETECT Figure 9 3 LS20 Electrical Power Block Diagram The Digital Control Board receives its power from the host computer No power is transmitted over the interconnect cable LSDT SERVICE MANUAL SECTION 9 0 LS20 9 5 Sub System Operation 9 5 1 DATA CONTROL BOARD DCB The DCB is a three quarter 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 IMB SIMM DRAM During data acquisition and filling of image memory when the end of physical is reached the address pointer will wrap and continue writing to memory at the beginning of memory Since a typical im
87. e PMT high voltage is adjusted instead of modifying the gain In this way the circuit characteristics are not changed and can remain at their optimal setting Since PMT aging is the principal cause of loss of sensitivity this method maintains optimal performance and can greatly reduce the need for periodic adjustment of the base PMT high voltage In addition to the AGC adjustment described above the LS85 LS85LF models include an Autozero adjustment which enables them to achieve their extended range Any DC offset in the signal path into the log amplifier will result in either instability or loss of sensitivity for very small signals The Autozero adjustment is made by forcing the PMT high voltage to zero and adding or subtracting signal into the log amplifier input by means of the 8 channel D A so that the optimum DC offset is maintained It takes about 1 5 seconds for the PMT high voltage power supply output to drop to zero when commanded so the driver allows extra time when executing DACQ Mode 5 To adjust the ISFILM threshold the input signal is connected directly to the A D bypassing the log amp Four lines are taken with the DSP causing samples to be taken at the same delay from SOS that the actual ISFILM detection circuit uses The samples are averaged and a voltage is output to the ISFILM comparator that is 31 32 of this average signal The ISFILM AUTOZERO sequence requires five line times for the ISFILM threshold adjustment plus two for the
88. e buffer contains changes or new lines which have not been written out To discard these changes and edit a new file use E instead of e Clear the edit buffer and begin editing a new file regardless of any changes to the current edit buffer Print the filename or set it to a new name if specified Join the addressed lines together or the current line to the previous line Mark the addressed line with the specified letter Example 17ka puts mark a on line 17 List the addressed lines showing all non printing characters and indicating the end of line Move the specified range of lines to follow the line number given Example 5 7m3 moves lines 5 through 7 up to follow line 3 Print the specified lines Quit the editor This fails if the edit buffer contains any changes If so use Q instead Quit the editor absolutely Any changes are discarded Read in a file adding it after the current line Substitute text on the current line Example s alpha beta finds the string alpha and replaces it with beta Transfer copy the specified range of lines to follow the line number given Example 5 7t7 puts a copy of lines 5 through 7 after line 7 Write the edit buffer out If a filename is given it is used and becomes the current filename If a range of lines is specified only those lines are written Write the entire buffer out to its file and terminate 10 14 LUMISCAN LSDT SERVICE MANUAL SECTION 10
89. e the zero light voltage to jump down to 4V If this does not take place rotate SLOPE CCW slightly remove the lens cover re adjust the minimum A D Count to 30 using OFFSET and cover the lens Then try again Adjust R103 CW until the trace on CH1 jumps up to stability Rotate an additional 1 4 turn 9 Verify the 0V reference on the oscilloscope Use SLOPE and OFFSET to achieve a minimum A D Count of 30 with the beam unblocked this will correspond to approximately 2 45V or 1 95V peak on CH1 depending on the DACQ PCA version and a maximum A D Count greater than 4060 and less than 4090 with the tape blocking the beam this will correspond to approximately 2 45V or 0 05V on CH1 depending on the DACQ PCA version 10 Exit DDT remove the oscilloscope leads 11 Re connect the cable on J3 of the LED PCA 12 Continue with Section 9 6 3 LS20 Correction LUT Generation 9 6 3 LS20 Correction LUT Generation Note A Correction LUT should be generated only if one of the following condition exists e The DACQ PCA was replaced e t was necessary to adjust SLOPE or R103 or R105 on the DACQ PCA since the last Correction LUT was generated e The existing Correction LUT is lost or accidentally deleted The digitizer voltages are verified to be optimal and the Density Verification Test Section 5 4 4 still fails The existing Correction LUT would the be suspected to be inaccurate or corrupted The final step in LS20 system alignment is to gen
90. eam can be parked at any location within 64 counts by setting the switches Film Transport Motor Control The LSDT film transport motor is a precision DC motor with a 256 count encoder The control for this motor is on the Data Acquisition board It is a frequency controlled servo amplifier with the reference frequency Filmclk coming from the DCB The linear film speed is directly proportional to the Filmclk frequency As with the galvanometer control this signal is always being generated by the DCB motor drive and direction are controlled by two DCB CSR bits Motor Enable and Film Reverse There are no adjustments to the film transport motor control circuit Speed is set by an input clock rate between 9khz and 16khz which accommodates the necessary range of film speeds When the Motor Enable bit is set to 1 the input clock signal is compared with a motor encoder signal The input clock signal causes a counter to count up the encoder rate signal causes the same counter to count down The residual count is converted to an analog voltage via a DAC to drive the motor When the motor encoder rate matches the desired input clock rate zero servo error and speed stability is attained Film reversal is performed by changing the polarity of the servo signal when the motor reverse signal is activated Interface to the Data Control Board The interface between the DCB and the DACQ is by a 37 conductor cable The signals include a bidirectional 8 bit dat
91. ept Min 0 030 Max 0 030 SAME R R Value Min 0 9995 SAME If the specifications are met the digitizer calibration is completed If the specifications are not met perform section 5 4 5 Correction LUT Generation 5 4 5 LS50 75 85 885LF Correction LUT Generation Note A Correction LUT should be generated only if one of the following conditions exists e The DACQ PCA was replaced e It was necessary to adjust SLOPE or R103 or R105 on the DACQ PCA since the last Correction LUT was generated e The existing Correction LUT is lost or accidentally deleted e The digitizer voltages are verified to be optimal and the Density Verification Test Section 5 4 4 still fails The existing Correction LUT would the be suspected to be inaccurate or corrupted The final step in LS50 75 85 85LF system alignment is to generate a correction lookup table CLUT for the system under test This is a software only process and creates a custom table which maps the indicated optical densities to actual densities A step wedge film see below is required along with a text file which contains dimensional information and the actual measured densities for each step See Appendix B for the definition of this file STEPWEDGE REQUIRED LS20 50 75 32 step Stepwedge 3 8 od P N 0068 749 LS50 7585 85LF 15 step Stepwedge 4 2 od P N 0068 874 The process of CLUT generation is simplified by the use of a batch file MKCLUT BAT which calls a number of programs to read the
92. erate a correction lookup table CLUT for the system under test This is a software only process and creates a custom table which maps the indicated optical densities to actual densities A step wedge film see below is required along with a text file which contains dimensional information and the actual measured densities for each step See Appendix C for the definition of this file 9 17 LSDT SERVICE MANUAL SECTION 9 0 LS20 STEPWEDGE REQUIRED LS20 50 75 32 step Stepwedge 3 8 od P N 0068 749 LS50 75 85 85LF 15 step Stepwedge 4 2 od P N 0068 874 The process of CLUT generation is simplified by the use of a batch file MKCLUT BAT which calls a number of programs to read the step wedge film and the reference file and create the CLUT data file and store it in the root directory of the computer Certain naming conventions are required for the files they are described below 1 Place the step wedge film in to the center of the film input slot with the notch on the top right Enter the following command line mkclut xxxx yyy where xxxx is the serial number of the machine e g 7007 and yyy is the last three digits of the filename of the reference density file The first three characters of this file must be den and the extension must be dat Thus if you enter 123 inthe yyy field the batch file will look for the file den123 dat The batch file will first execute SCANFILE EXE in a special diagnostic mode which bypasses t
93. erently high stability dynamic range and bandwidth and depend only on resistor values for accuracy 4 12 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION Start end of Film Detection The Start End of Film ISFILM detector operates by sensing the loss of signal due to film in the beam path The pre log analog signal is fed to a self adjusting threshold detector During scanning the ISFILM detector is armed by the NEXTSCAN signal which also initiates a galvo sweep After a fixed delay the output of the ISFILM comparator is sampled If the signal is less than the threshold voltage then ISFILM is set true The delay to the sample point is fixed and is intended to occur at the point during the sweep when the beam is at the center of the collection cylinder maximum signal This depends on the correctness of the galvo system adjustment The detection threshold is adjusted during the automatic zero adjustment sequence Mode 5 which is invoked before the film has arrived in the optical path The signal at the fixed delay is sampled and averaged then the threshold is set to 31 32 969 of this result ISFILM detection occurs on the non log signal this corresponds to a minimum detection threshold of approximately 014 OD Acquisition Control The acquisition process begins with the initiation of an A D sample of the reference compensated output of the log amplifiers Control is primarily by the DSP device DQDSP DSP in conjunctio
94. erial Number 0263 Enter lines to first step 0 00 7 2 10 11 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI Enter lines of each wedge 0 00 2 9 Enter Wedge 1 0 00 07 Enter Wedge 2 0 00 14 Enter Wedge 3 0 00 25 Enter Wedge 4 0 00 47 Enter Wedge 5 0 00 59 Enter Wedge 6 0 00 70 Enter Wedge 7 0 00 80 Enter Wedge 8 0 00 92 Enter Wedge 9 0 00 1 06 Enter Wedge 10 0 00 7 17 Enter Wedge 11 0 00 1 30 Enter Wedge 12 0 00 1 40 Enter Wedge 13 0 00 1 52 Enter Wedge 14 0 00 1 63 Enter Wedge 15 0 00 1 73 Enter Wedge 16 0 00 1 86 Enter Wedge 17 0 00 2 00 Enter Wedge 18 0 00 2 11 Enter Wedge 19 0 00 2 25 Enter Wedge 20 0 00 2 38 Enter Wedge 21 0 00 2 52 Enter Wedge 22 0 00 2 63 Enter Wedge 23 0 00 2 76 Enter Wedge 24 0 00 2 87 Enter Wedge 25 0 00 2 97 Enter Wedge 26 0 00 3 10 Enter Wedge 27 0 00 3 22 Enter Wedge 28 0 00 3 34 Enter Wedge 29 0 00 3 47 Enter Wedge 30 0 00 3 61 Enter Wedge 31 0 00 3 80 Enter Wedge 32 0 00 3 86 Enter Wedge 33 0 00 td id aal ees a es a ee ee es iraa a GN an a a a a a ea G a A a PS Cy aS SD MS Ua a aS pM Un aS CS Cn US CS Ce E ar note a blank line ends input Enter cmd H Q P D E p The density file will be printed to the screen 10 12 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI
95. etected as a film edge 7 2 7 Light Edges If the edges of an image are significantly lighter than the rest of the image it is likely that the beam is flawed Misalignment or contamination of the optical path can cause the beam to have spikes rings or satellites 7 2 8 Vertical Lines in Images Vertical lines are usually caused by dirt in the optical path usually in the light collection chamber opening 7 2 9 Streaming If the images are blurred from left to right along the X axis the Photo Multiplier Tube is slow and needs to be replaced 7 2 10 Uneven or Wavy Edges If the images have uneven or wavy edges the Galvanometer has likely failed and needs to be replaced 7 2 11 Density Failure If densities are too light or too dark perform the PMT Sub System Adjustment in Chapter 5 7 4 LUMISCAN 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 LUMISCAN LSDT 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 Lumiscan LSDT product Here is a list of those diagnostic s DOS Win95 Win98 gt C LSDT TOOLS LSDT tools programs and driver WinNT prior to v2 00 gt C NTLSDT TOOLS LSDT tools programs WinNT v2 00 and later C LSDT32 TOOLS
96. fer pulse for a CCD scanner The second counter is the film clock FILMCLK is used by the DACQ board as the drive input of a frequency controlled servo film motor circuit The third timer is used as a counter for generating the delay to first pixel while scanning PIXDLY signals the EPM7032 at U2 DCCSR to enable the fourth counter which counts the pixels per line This counter outputs a LASTPIX for each scan line The fifth timer uses the LASTPIX signal for clocking the number of lines scanned Once the line count is finished the counter outputs the LASTLINE signal to DCCSR Both signals LASTLINE and LASTPIX cause DCCSR to generate an interrupt at output IRQ Interrupts are also generated by EVENTO ISFILM and SOS The 2K X 9 FIFO at U19 stores the image data from the DACQ The FIFO is needed to prevent the CPU from missing pixels when a DRAM refresh occurs while DMA channel 0 is moving data from FIFO to memory U20 and U22 are used to latch the 8 bit data output from the FIFO and convert it to a 16 bit value for the data bus The FIFO read and write is controlled by U27 SCDMAFIF U27 also generates the DMA channel zero request DRQO for starting the DMA transfer 10 7 4 SCSI The SCSI section contains all the functions of the NCR SCSI board currently in production The 53CF94 chip performs common SCSI sequences in response to commands from the CPU The bus configuration uses 16 bits for DMA SCSI to memory and memory to SCSI transfers and 8 bi
97. hardware 10 9 1 EDDEN Edit the Density file The EDDEN program is used to create and modify the density files used by MKCLUT and CHKCLUT on the Internal SCSI scanner 10 10 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI Command line EDDEN densityFile where densityFile is the actual file name of the density value file If you use MKCLUT CHKCLUT as follows MKCLUT 9999 014 then the densityFile should be DENOI4 DAT example EDDEN den014 dat Commands D num DELETE wedge entry num wedge number to delete E num EDIT Entry mode num optional wedge number to start editing H HELP display list of commands P PRINT display the complete list of density file values Q QUIT save file and end program Note writing a file to the Flash memory can take a long time 2 minutes The following is an example of creating a new density file Note user inputs are in BOLD D gt edden den001 dat EDDEN Processing density file den263 dat No DENSITY file found EDDEN Could NOT find density file den263 dat Do you wish to create a new density file YIN y Serial Number lines to first step 0 00 lines of each wedge 0 00 NO Wedge density information in file D num DELETE wedge entry num wedge number to delete E num EDIT Entry mode num optional wedge number to start editing H display this message P print the density file values Q quit Enter cmd H Q P D E e Enter S
98. he lookup tables Then RDWEDGE EXE will extract the average values in counts of each of the steps and plot to the screen the following graph Figure9 7 Clutxxxx dat V1 3 Jan 26 1994 Max value is 4695 Min value is 4695 66 RDWEDGE pairs the counts with the measured values contained in denyyy dat The results are saved in a text file called rl dat Finally the program GENCLUT EXE uses these values to generate the actual CLUT which is saved as c clutxxxx dat NOTE 9 18 LSDT SERVICE MANUAL SECTION 9 0 LS20 Whenever TSR driver tries to load the CLUT it will always look for this file 2 Place the stepwedge back into the system You will be prompted to press Ctrl C to exit the process or press enter to allow the process to repeat Press enter to repeat the process 3 After the process is repeated three times wait for the film to exit the third time Then you will be prompted to Ctrl C or continue This time Ctrl C to exit the process 4 Verify that the reported results meet the following specifications Note These stringent specifications are desired but are not requirements The actual required field performance specifications are listed in the LSDT Field Functional Specification P N 0069 231 and are excerpted in section 9 6 1 LS20 Density Verification Test The CHKCLUT process only not MKCLUT must be performed before comparing the results with the LSDT Field Functional Specification LS20 Slope Min 0 985 Max 1
99. ible Above 1 6V is acceptable 3 Run DDT 1 Select option 4 Load LUT 2 Select option 1 0 4095 12 BIT LUT 3 Select option 6 Correction LUT Memory Location 4 Select option 1 0 4095 12 BIT LUT 5 Select option 5 Smoothing LUT Memory Location 6 Select option 10 Display A D Value Observe the monitor display the following will be displayed The actual values may differ minVal pixel 512 2 30 maxVal 3675 minVal pixel 512 2 30 maxVal 3675 minVal pixel 512 2 30 maxVal 3675 4 On the DACQ PCA adjust R84 OFFSET located in the lower left corner to obtain in the minVal pixel column the decimal value of 30 2 as displayed on the computer monitor 5 Connect oscilloscope trigger sync channel to TP8 SOS on the DACQ PCA Trigger on Slope and set sweep to 1 ms div Connect channel 1 to TP1 SIG on the DACQ PCA The peak voltage while displaying an A D Count of 30 will be approximately 2 45V on version 4 and version 6 DACQ 9 16 LSDT SERVICE MANUAL SECTION 9 0 LS20 PCA s or approximately 1 95V on version 5 DACQ PCA s 6 If you are experienced at this adjustment skip to step 8 7 Cover the lens with a lens cover or floppy disk Attach a Digital Volt Meter probe to the right side of R106 Adjust Pot105 for a voltage of 5 0V 0 1V Remove the probe and attach it to the right side of R104 Adjust Pot103 for a voltage of OV 0 1V 8 Adjust R103 CCW to caus
100. ical subsystem contains a controllable solid state illumination system a fixed focus lens system a CCD array board and an electronics subsystem for control and data acquisition The LS20 illumination system provides high intensity uniform illumination of the film It is a solid state design comprised of multiple light emitting diodes LEDs which provides long life For films which are less than the full width of the illuminator the outside LEDs can be turned off which reduces the effects of stray light and glare Light transmitted through the film is focused onto the CCD array converted to an analog signal which is logarithmically amplified corrected for spatial variations in the illumination system then digitized by an A D converter 9 4 Digital and Electrical Systems The electrical subsystem of the LS20 consists of the Data Control Board DCB that is located in a host computer such as an AT PC an interconnecting cable to the LS20 and the scanner which houses five printed circuit boards These include Data Acquisition Board DACQ CCD Board LED Interface Board LED Array Board 5x Indicator Board 9 4 1 Data Control Board All operations are controlled by the Data Control Board DCB via means of control registers Although some of these registers are physically located on the Data Acquisition Board they are accessed through the DCB The DCB also contains image memory which acts as a buffer during acquisition 9 4 2 D
101. igh voltage then go to 5 4 3 Otherwise proceed to step 3 3 Adjust R8 on the PMT Preamp PCA to obtain the correct PMT Offset voltage 0 1 mV as specified on page 5 9 4 Disconnect the DVM and reconnect the PMT High Voltage Cable 5 4 3 LS50 75 85 85LF DACQ PCA Final Alignment l Unplug the Galvo Input power cable at J3 on the Galvo PCA Verify that the beam is stationary at the horizontal center of the slot to within 0 50 inches 2 Connect the DVM to TP9 of the DACQ PCA If you have an older system you may not have a TP9 In this case attached the DVM to the bottom of R10 or the bottom of R41 Verify that the voltage measured is not near OV If the voltage is near OV there is probably a beam obstruction failed PMT P S or a shorted PMT HV Cable Resolve these issues before proceeding Expect to see above 3 0VDC initially 3 Adjust the PMT input High Voltage POT140 on the DACQ PCA to obtain at TP9 the nominal PMT output voltage as specified in the chart on page 5 9 Note On older DACQ PCA s that do not have HV AGC this adjustment is done on the PMT HV P S If your system has both an R140 and a cable attached to J14 AUX I O it has HV AGC If either one of these items is missing the system does not have the HV AGC feature Reconnect the Galvo input power at J3 4 Disconnect the DVM from TP9 and connect it using needle probes to the PMT P S Molex connector on the right side of the scanner If you only have clip DVM probes
102. in half the number of bytes Hit enter to return to main menu Repeat the diagnostic scan with mode 7 Diagnostic Pattern Verify that the size of the file is now reported as 1024 x 1024 x 1 1048576 When done enter the command line H8 This is an 8 bit version of HIST12 so there are only 256 bins to count for Verify that all 256 bins have 4096 counts each The screen will print out until full hit Return to empty the remainder of the buffer Repeat this 8 bit test except in the submenu choose 6 Flat Field Pattern When the results of HIST are displayed verify that the reported count for every value is 0 except for 05 which should have a count of 1048576 When done return the parameter back to 12 bit mode 7 10 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS 7 3 2 SCANFILE Scanfile using the following parameters Pixels per line 1024 Pixel depth 12 bits pixel Pixel format LSB LUT format Normal Filename Isdt img The command line for SCANFILE has the following format SCANFILE PPL PD PF LUT F TIF FF Options available are PIXELS PER LINE Default is 1024 PPL x Set PIXELS PER LINE to x x is limited to 1024 on the LUMISCAN 50 and 2048 on the LUMISCAN 75 PIXEL DEPTH Default is 12 bits PD 12 Set PIXEL DEPTH to 12 bits pixel PD 8 Set PIXEL DEPTH to 8 bits pixel PIXEL FORMAT Default is LSB first PF LSB Set PIXEL FORMAT to LSB first PF MSB Set PIXEL FORMAT to MSB first L
103. is asserted for each pixel if ISFILM is also true Mode 3 Scan With No Calibrate This is the same as Mode 2 except that there is no calibration cycle The existing data in the calibration table is used Mode 4 Scan With No Wait No Upper Limit This is a diagnostic mode There is no calibration cycle and there is no upper limit applied The CLUT Calibration LUT SLUT and the Output LUT are applied as with Mode 2 DATAVAIL does not wait for ISFILM to go true in Mode 4 but is always asserted Mode 5 AGC Autoisfilm Autozero Only Performs an Automatic Gain Isfilm detect threshold and Autozero adjust sequence according to the value of the AGC Enable bit then stops Mode 6 Diagnostic Flat Field Diagnostic scan mode Similar to Mode 4 except that the data is fixed at value 1285 hex 505 This is useful for testing the digital only portion of the system Mode 7 Diagnostic Pattern Diagnostic scan mode Similar to Mode 4 except that the data consists of groups of incrementing values as follows The first 256k pixels consist of a repeating pattern of O through 1023 repeats 256 times the next 256k pixels have a repeating pattern of 1024 through 2047 the next are 2048 through 3071 and finally 3072 through 4095 On a 1k x 1k display this appears as four horizontal ramps each 256 lines high the top ramp has values from 0 through 1023 the bottom ramp 3072 through 4095 Note It is necessary to have a display capable of displaying 12 bit images
104. istic If used it is applied immediately after the A D results are read The Correction LUT is not used in Mode 5 Autozero or in Mode 1 which is used specifically in the generation of the Correction LUT itself The Calibration LUT is used to compensate for variations in the sensitivity of the system with respect to the scan path It is generated by the DSP in Modes 1 and 2 The Calibration LUT is generated by acquiring 16 lines at the beginning of a scan through air before the film has arrived at the optical path The 16 lines are averaged and written into the Calibration Table by the DSP Unlike the other LUTs the input to the Calibration LUT is the pixel number or location The Smoothing LUT performs two functions It implements the signal upper limit but smoothes the transition from 1 1 to limit so as to avoid the contouring effect of an abrupt limit The Output LUT is for user use and depends on the application The default table is a 1 1 lookup Table It can be replaced by an inverse 1 1 a 12 bit to 8 bit mapping or any other desired function Automatic Gain Zero and Isfilm Detect Threshold Adjustment Automatic gain zero adjustments AGC and Autozero are performed whenever a DACQ mode 5 command is received The DACQ Mode 5 is a special mode exclusively for the automatic adjustment of the input gain and offset of the logarithmic amplifier as well as automatic adjustment of the ISFILM threshold The only data generated in Mode 5 is a four
105. ive and ground wires are used This port is set for 9600 baud 8 bits No Parity 1 stop bit The serial port is used to access the internal microcontroller for system configuration maintenance and diagnostics 10 8 2Scanner Control Program Normally when the scanner is powered on the main control program is executed The main program is named LSDTISO EXE The LSDTISO program takes command input from the SCSI bus and translates it into control operations for the scanner hardware Image data is taken from the scanner hardware buffered in onboard memory and then sent to the host When a terminal is attached to the serial port input is received and process by the control program The LSDTISO program accepts several single key commands X O D F L and Q These commands are case sensitive X dump internal SCSI interface chip registers O display status of internal FIFO error flag good or overflow D enable disable screen debugs toggle internal program status info F enable disable SCSI commands toggle data and status display L dump internal DMA controller registers CAN CAUSE ERRORS Q quit program exit to command line prompt Note the L command can cause data loss and other errors if used while the scanner is transferring data DMA active Normally only the Q quit command is used to get access to the command line diagnostics Sometimes the F Formatted SCSI da
106. ixel in line Last line in image Change in Isfilm film entering or leaving optical path and Event 0 which is used for the Abort switch on the LS20 Each can be independently enabled and cleared 9 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 CCD timing signals and provides the Film Motor control and drive Most of the digital logic on the DACQ board is contained in two large PLDs and a DSP These are ICs which are SRAM based and must be downloaded with code before they become functional The DSP downloads or boots at power on and each time a DACQ function is initiated However at power on and after the DSP boots it then also downloads the two PLD s with their code If for some reason the download fails to complete the board will be nonfunctional CCD Timing Signal Generation The CCD array sensor requires several timing signals in order to generate a proper output signal including reset transport and transfer clocks The requirements for these signals are very stringent for optimum results The are generated in the PLD DQFMGV GDF and use the Scanclk signal from the DCB for basic synchronization The signals are continuously produced as long as Scanclk is being received and so an output signal is always available from the CCD board Signal Conditioning The analog signal path consists
107. k The file format is CLUTXXXX DAT for digitizers with 4 digit Serial Numbers or CLTXXXXX DAT for digitizers with 5 digit Serial Numbers This file is installed in the C WINNT S YSTEM32 DRIVERS directory Although more than one different file of this format can be installed the LSDT Control Panel needs to specify which file is to be used for the particular digitizer in use Installing the LSDT NT Software will create in the NT Control Panel a Device called LSDT The LSDT Device can be set to start automatically or manually Until the proper DCB resources are found it is recommended that the LSDT Device be set to Manual to prevent the PC from locking when turned on 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 The LSDT Control Panel needs to match the DCB resource hardware settings The default resources are Segment Address DOOO IRQ 5 and Base I O 100 If these resources are used it isn t necessary to change the LSDT Control Panel The most common alternate DCB resources are Segment Address D800 IRQ 7 and Base I O 120 To verify the driver is installed properly perform the following steps Go to a COMMAND prompt Navigate to C NTLSDT TOOLS Insert a film Run the SCANFILE EXE program At the end of the scan the number of pixels per
108. l pixel 512 30 maxVal 3675 2 On the DACQ PCA adjust the OFFSET potentiometer located in the lower left corner to obtain in the minVal pixel column the decimal value of 30 2 as displayed on the computer monitor Note This POT is either R84 or R36 depending on the DACQ PCA P N Note Even if you can t adjust to 30 proceed to step 3 3 Connect oscilloscope trigger sync channel to TP8 SOS on the DACQ PCA Trigger on Slope and set sweep to 1 ms div Connect channel 1 to TP1 SIG on the DACQ PCA Verify that the waveform is similar to Figure 5 4 The peak voltage while displaying an A D Count of 30 will be approximately 2 45V on DACQ PCA versions 1 2 3 4 6 and approximately 1 98V on DACQ PCA version 5 Figure 5 3 Typical Waveform at SIG Test Point Displayed above is a 6ms trace and a 3ms re trace The peak in the middle of the trace corresponds to the position of the Photomultiplier Tube 4 Place a 2 strip of black masking tape at the bottom center of an 8 inch wide dark film Insert the film and manually position the film until the laser is swept across the dark portion of the film and the tape a two inch strip centered near the bottom edge of the film In the middle of the trace where the tape blocks the beam is the voltage which corresponds to no light To either side of the tape is the voltage which corresponds to the dark area of the film 5 For DACQ PCA s without R103 or R105 potentiomete
109. le observing the laser spot position in the slot Select a combination which parks the spot just inside the slot as close to the end as possible This completes the final Galvo alignment for the LS50 LS75 LS85 LS85LF 5 8 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 5 4 PMT Sub System This section provides the method of adjusting the PMT Sub System for alignment verification or re alignment Note In this procedure when a Digital Volt Meter DVM is specified an Oscilloscope can be substituted DACQ PCA P N Model PMTout PMT Offset R103 R105 R140 RefAmp Version 0062 476 LS50 8V 4mV No No No Yes 1 0067 646 LS50 8V 4mV No No No Yes 1 0068 663 LS50 8V 4mV No No No Yes 1 0068 7 12 LS50 8V 4mV No Yes No Yes 1 0069 131 LS50 6V OmV No Yes No Yes 2 0069 156 LS50 8V 4mV No Yes No Yes 1 0069 098 LS50 6V OmV Yes Yes No Optional 3 0069 736 LS50 6V O0mV Yes Yes No No 4 0069 952 LS50 6V O0mV Yes Yes Yes No 5 0070 197 LS50 6V OmV Yes Yes Yes No 4 0070 977 LS50 6V O0mV Yes Yes Yes No 5 0071 412 LS50 6V OmV Yes Yes Yes No 6 0071 692 LS50 6V OmV Yes Yes Yes No 6 0068 219 LS75 8V 4mV No No No Yes 1 0068 67 1 LS75 8V 4mV No No No Yes 1 0068 711 LS75 8V 4mV No Yes No Yes 1 0069 132 LS75 6V OmV No Yes No Yes 2 0069 093 LS75 6V OmV Yes Yes No Optional 3 0069 739 LS75 6V OmV Yes Yes No No 4 0069 954 LS75 6V OmV Yes Yes Yes No 5 0070 198 LS75 6V OmV Yes Yes Yes No 4 0070 979 LS75 6V OmV Yes Yes Yes
110. lity should be run The CHKCLUT program scans a special film called the step wedge film The step wedge is a film with bands of constant density across the film A text file called the density file containing a list of the actual density vales for each wedge is read The program then compares the pixel values in the image with the true density values CHKCLUT serial number density tag serial number system serial number provide for compatibility not used density tag the unique specifier for the density filename See the MKCLUT description 10 8 3 2 MKCLUT Make CLUT The MKCLUT program is used to create a CLUT file from scratch The CLUT is a lookup table that corrects the raw pixel values to there true optical density values The MKCLUT program scans a special film called the step wedge film The step wedge is a film with bands of constant density across the film A text file called the density file containing a list of the actual density values for each wedge is read The program then compares the pixel values in the image with the true density values 10 9 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI By using the differences between scanned pixel values and the true values a correction LUT is generated This correction LUT is the DACLUTOO00 DAT written to the flash file system MKCLUT serial number density tag serial number system serial number provide for c
111. n is accomplished through a Bank register The image memory is accessible at all times including during image acquisition An arbiter controls access giving the data writes priority over bus access If necessary the PC bus IOCHRDY signal is asserted to delay the bus access The image memory should never be written to from the bus during image acquisition During image acquisition an separate 24 bit counter selects sequential byte addresses for each data write counting always starts at address zero Address counting is only enabled when SCAN is true and is reset to 0 when SCAN changes from false to true The counter can be read at any time The control registers are mapped into the I O addresses 100 hex through 117 These locations are fixed and can be changed only by changing the firmware Newer versions of the DCB known as the DCB2 and DCB3 allow the selection of an alternate mapping of the I O registers by means of a DIP switch The DCB2 has one alternate and the DCB3 has 3 alternates In addition to image memory there are 64KB of memory on the Data Acquisition board which are accessible through the DCB This memory is where the calibration and lookup tables are located and is fully R W accessible but only while not scanning Access is sequential through a 16 bit I O register The memory is organized on the Data Acquisition board as eight tables of 4K x 16 bits each The sequential access can begin at the beginning of any one of the eight tables
112. n the center Load films justified to the left side of the tray Load as many film as desired up to 70 films maximum Once all films are loaded raise the film tray until it clicks into the ready position A scan can now be initiated from the applications software VIEWING SURFACE Figure 3 4 Loading the Autoloader 3 6 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION 4 0 THEORY OF OPERATION This section contains the theory of operation for the LS50 75 85 85LF scanners The theory of operation for the LS20 see section 9 4 1 Product Overview The LUMISCAN Desk Top Scanners LSDT are single sheet laser film digitizers designed to digitize x ray film and measure diffuse optical density The system is based on a fixed size scanning spot and is characterized by high spatial resolution and a wide gray scale dynamic range This is achieved with a high intensity spot of light derived from a HeNe laser that is scanned across the film plane as the film is moved perpendicular to the beam scan The transmitted light is collected and digitized to provide an image that can be stored on disk transmitted to other systems for processing and manipulation archived and or printed back onto film Figure 4 1 Lumiscan LSDT 4 2 System Configuration The configuration of the LUMISCAN Desk Top Scanner LSDT includes optics electrical and power supply assemblies PCAs for scanner control and data acquisition and a film transpo
113. n with PLDs DQCTRL TDF and DQDSPIF TDF A pixel acquisition sequence is initiated by each PIXTRIG signal from the Data Control Board The function performed for each pixel depends on the Mode which is selected in the DACQ CSR During acquisition the functions may include a calibration step from one to three lookup table steps and a check of the data against upper and lower limits In all modes except Mode 5 and during calibration the acquisition process ends with the writing of data into the output registers 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 Look table functions are Correction LUT Calibration LUT and Output LUT The Correction LUT is used to correct any deviation of the logarithmic amplifier from a true logarithmic characteristic If used it is applied immediately after the A D results are read The Correction LUT is not used in Mode 5 Autozero or in Mode 1 which is used specifically in the generation of the Correction LUT itself The Calibration LUT is used to compensate for variations in the sensitivity of the system with respect to the scan path It is generated by the DSP in Modes 1 and 2 The Calibration LUT is generated by acquiring 16 lines at the beginning of a scan through air before the film h
114. nal interfaces consists of a SCSI 2 connector RJ 11 serial connector and a rotary switch for selecting the SCSI ID The scanner control program running on the internal microprocessor board provides the interface between the host commands coming from the SCSI bus and the scanner hardware During a scan operation image data from the scanner is buffered in a circular buffer on the controller The circular buffer is 4MB or optionally 16MB If the host computer fails to read the image data in a timely fashion a data lost error will occur This data lost error is unique to the internal SCSI option The older external SCSI option was always configured with enough internal memory to buffer a complete image I2 5V POWER ACTIVE TERMINATOR TIMERS DCB INTE BUFFER FIFO AND 53CF94 SCSI CONTROLLER A CONTROL FIFO AND DATA LATCHES BUFFERS DATA BUS ADDRESS MUX ADDRESS BUS 386EX PROCESSOR 386EX INTERFACE AND DRAM CONTROLLER MEMORY Figure 10 1 LSDT INTERNAL SCSI PCA 10 1 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI 10 2 10 3 10 4 Installation Installation of the LSDT scanner with internal SCSI option should be easy Plug in the scanner power attach the SCSI cable and select the SCSI ID and the system is ready to scan Depending
115. not secured with any hardware If the unit is to be moved or shipped the Collator section must be removed packaged and shipped separately 2 2 10 Installation of Optional Autoloader Plastic Digitizer If the LUMISCAN LSDT was purchased with the optional Autoloader remove the Autoloader section from the box Remove power from the digitizer While firmly holding the Autoloader with both hands lower it onto the front of the digitizer see Figure 2 3 Once the Autoloader section is in place press firmly to seat This section is not secured with any hardware If the unit is to be moved or shipped the Autoloader section must be removed packaged and shipped separately CAUTION This section is made of molded plastic and will break if dropped LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION 6 SHEET FEEDER Figure 2 2 Installing Collator Section 2 6 LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION AUTOLOADER Figure 2 3 Installing Autoloader Section 2 7 LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION 2 3 SOFTWARE INSTALLATION ISA Interface The LUMISCAN 20 50 75 85 comes configured with either the ISA Interface for PCs or the SCSI Interface for PCs and workstations Lumisys provides host computer support software for the LUMISCAN 20 50 75 85 configured with the ISA Interface If you have the SCSI Interface you do not need to install host software unless you want
116. nterface connector If there is a phone jack next to the connector the digitizer is a SCSI Interface If there is no phone jack the Interface type is ISA With power off remove cover from the IBM compatible PC Taking appropriate anti static precautions remove the Data Control Board from the accessory box and install it in an 8 or 16 bit ISA slot Secure the DCB in the slot and replace the covers The Data Control Board is factory configured to use IRQ 5 I O Addresses 100 11F and has a 32 KByte window at hex address D000 D7FF If these addresses conflict with your system configuration they may be changed The hardware configuration is determined by a DIP switch and an IRQ jumper on the Data Control Board Please see APPENDIX A for instructions on how to change the IRQ level the I O address or the 32 Kbyte window address NOTE The minimum hardware requirements for the Host computer is as follows DOS 5 0 or higher Windows 95 98 Windows NT 4 0 or higher PC 386 16 MHZ PC 486 33MHZ PC Pentium class or faster 640K bytes memory 16MB memory 32MB memory 2 25 Installation of SCSI Controller SCSI Interface On the rear panel of the digitizer will be an ISA Interface connector or a SCSI Interface connector If there is a phone jack next to the connector the digitizer is a SCSI Interface If there is no phone jack the Interface type is ISA The SCSI Controller is not included Install a commercial SCSI Controller and it s appropriate driver
117. nterface emulation software for the LUMISCAN 20 50 75 85 configured with the SCSI Interface This allows SCSI Interface digitizers to be controlled by applications designed for the ISA Interface If you have an ISA Interface digitizer please refer to section 2 3 To determine if your digitizer supports the ISA Interface Emulator feature open a terminal session with the internal PC of the digitizer using the instructions in Chapter 10 From the DOS terminal prompt execute the version command which will display the version of the internal PC software If the version is 3 60 or later the digitizer supports the ISA Interface Emulator feature Space will be required to save digitized images on disk Most films will require 2 5 to 10 5 MBytes of disk space to store the digital image depending on the resolution at which the film is digitized The LUMISCAN 85 can generate images up to 64 MBytes in size and the LUMISCAN 75 can generate 40 MBytes 2 4 1 ISA Interface Emulator Operating System SCSI Interface To install the LUMISCAN 20 50 75 85 ISA Interface emulation software you are required to have one of the following ISA Interface Operating Systems installed on your PC and at least 3 0 MBytes of hard disk space available for the creation of a directory and transfer of files from floppy distribution disk 32 bit disk v2 00 or higher use latest release ISA Emulator Operating System Requirements Windows 95 Windows 98 Windows NT 4
118. nual 13 Environmental There are several environmental factors to consider when installing the LUMISCAN LSDT Basic concerns are humidity and temperature The limits are 20 to 80 non condensing and 20 to 35 C operating respectively Other factors to consider prior to installing the LUMISCAN LSDT are dust and ambient light The LUMISCAN LSDT contains optics that are affected by dust The system is sealed but in a dusty environment small amounts of dust and or dirt may enter the optics module This dust can affect image quality To prevent this potential problem it is recommended that the LUMISCAN LSDT be installed and operated in an environment where the system will not be exposed to unusual amounts of dust The ambient light in the room in which the system operates is important While the LUMISCAN LSDT limits the paths for light entry some light may get into the system These light leaks may affect image quality 1 4 Physical requirements The LUMISCAN Models weigh over 70 pounds It is important the system is placed on a table or stand that can provide adequate support 1 1 LUMISCAN LSDT SERVICE MANUAL SECTION 1 0 PRE INSTALLATION This page intentionally left blank 1 2 LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION 2 0 LUMISCAN LSDT INSTALLATION 2 Unpacking Instructions WARNING THE LUMISCAN LSDT WEIGHS OVER 70 POUNDS IT REQUIRES TWO PEOPLE TO SAFELY LIFT AND MOVE IT THE LUMISCAN LSDT USES A LA
119. nue until all films are loaded Once all films are loaded initiate a scan from the applications software To digitize a single film load the film into Slot 1 It is not necessary to reset the Film Feeder for a single film operation although it is a good practice to always reset the Film Feeder before loading films NOTE If films are loaded when the Film Feeder is not reset and an attempt is made to digitize the films a Jam will Occur In the event of a film jam it may be cleared by using the SCAN ABORT button or in the case of an extreme jam the film collator section may be removed To remove the collator section grasp it firmly with two hands and pull upwards Having removed this section set it down and then clear any film jam CAUTION This section is made of molded plastic and will break if dropped To replace the collator section lower it slowly over the guide and alignment pins Once the Collator is in place and centered push down firmly to seat LUMISCAN LDST SERVICE MANUAL SECTION 3 0 SYSTEM OPERATION Figure 3 3 Reset Lever Loading film 3 5 LUMISCAN LDST SERVICE MANUAL SECTION 3 0 SYSTEM OPERATION 3 6 Optional Autoloader Operation The Lumiscan LSDT may be purchased with an optional Autoloader The Autoloader can automatically feed up to 70 films and accommodates film sizes from 18 x 24 cm up to 14 x 17 inches Before loading films the film tray must be lowered To lower the film tray pull down o
120. o PCA Galvo PCA V3B or later R59 on the Data Acquisition PCA 5 5 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 1 If only the DACQ PCA has been replaced in a digitizer that is already adjusted for linearity proceed to step 9 If you are not replacing any components proceed to step 6 2 Locate the physical center of the slot This is right above the center section of the lower roller 3 Remove the Galvo power from J3 of the Galvanometer PCA and observe the location of the laser spot Verify that the spot is within 0 50 from the center mark If not reposition the mirror on the galvanometer shaft and realign the folding roof mirror so the beam is at the proper height and level in the Collection Chamber opening 4 Reconnect the power to the Galvo PCA and ensure the galvo is not scanning Connect the DVM to TP6 on the DACQ PCA If a DVM is not available an oscilloscope can be used 5 Place a shunt across the JP1 CTR test point on the DACQ board and adjust Galvo Offset for a reading of 0 v 01 v Use POT98 on the Galvo board to align the laser spot to within 0 50 in of the center reference mark If the beam cannot be moved all the way to the center with POT98 use binary dip switch SW101 to make a coarse adjustment Increment SW101 to move the beam to the left Decrement SW101 to move the beam to the right Once the beam is closer to the center complete the adjustment with POT98 Remove the shunt from JP1 CTR on the DACQ
121. o be tied directly to 5 volts VCC The settings of the WP inputs are different between U10 and U28 U10 has WP grounded so the boot block Upper 128K block is write protected to avoid data corruption When the ISO board is powered on the 386EX accesses U10 with UCS and runs the BIOS The BIOS is located between addresses OxX00FE000 and 0x0100000 DOS is then loaded as a BIOS extension from address OXOOF0000 and searches for a boot disk The boot disk drive C is located between addresses OxX00E0000 and OxOOEFFFF and contains the autoexec bat and config sys files for boot up The config sys file contains the device drivers for creating a 128K RAM disk drive E and a 896K flash disk drive D Only 750K of the flash disk is available for storage due to overhead of the flash file system The programs necessary to control the DCB and SCSI sections can be loaded onto drive D These programs can either loaded serially through the console at J4 or programmed into the flash chip with a device programmer Programs can also be loaded into the RAM disk for temporary storage All data on the RAM disk is lost when the ISO board is powered off DOS uses the conventional memory 640K located between address 0x0000000 to OxOO9FFFF for running the executable programs DCB The DCB data control board section contains all the functions of the ISA bus DCB currently in production The main difference between the two boards is that the internal SCSI DCB uses both a
122. ode 2 Scan With Calibrate Only This is the normal scan mode In this mode the A D output is passed through the CLUT then the calibration table then checked for upper and lower limits and finally passed through the Output LUT and written to the data register The Calibration Table generated using the current timing parameters as described above Mode 1 DATAVAIL is asserted for each pixel if ISFILM is also true Mode 3 Scan With No Calibrate This is the same as Mode 2 except that there is no calibration cycle The existing data in the calibration table is used Mode 4 Scan With No Wait No Upper Limit This is a diagnostic mode There is no calibration cycle and there is no upper limit applied The CLUT Calibration LUT and the Output LUT are applied as with Mode 2 DATAVAIL does not wait for ISFILM to go true in Mode 4 but is always asserted Mode 5 AGC Autoisfilm Only Performs an Automatic Gain and Isfilm detect threshold adjust sequence and stops Mode 6 Diagnostic Flat Field Diagnostic scan mode Similar to Mode 4 except that the data is fixed at value 1285 hex 505 This is useful for testing the digital only portion of the system 4 15 LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION Mode 7 Diagnostic Pattern Diagnostic scan mode Similar to Mode 4 except that the data consists of groups of incrementing values as follows The first 256k pixels consist of a repeating pattern of O through 1023 repeats
123. of a single two stage logarithmic amplifier The log amp is a special type that does not depend on a semiconductor junction but rather a resistor ladder network They have inherently high stability dynamic range and bandwidth and depend only on resistor values for accuracy Start end of Film Detection The Start End of Film ISFILM detector operates by sensing the loss of signal due to film in the beam path The pre log analog signal is fed to a self adjusting threshold detector During scanning the ISFILM detector is armed by the NEXTSCAN signal 9 7 LSDT SERVICE MANUAL SECTION 9 0 LS20 TABLES 32KX16 FILM DET 01 4 MULTI CHAN SERIAL D A Pd 1 DQDSPIF TOF TO LED I F BD DQCTRL TOF FILM DET ro cco s0 DOFM6V 6DF FILM MTR ENC TO FILM MTR Figure 9 5 Data Acquisition Board After a fixed delay the output of the ISFILM comparator is sampled If the signal is less than the threshold voltage then ISFILM is set true The delay to the sample point is fixed and is intended to occur at the mid of the CCD array The detection threshold is adjusted during the automatic zero adjustment sequence Mode 5 which is invoked before the film has arrived in the optical path The signal at the fixed
124. ompatibility not used density tag the unique specifier for the density filename The density file contains the actual optical densities of the step wedge film density filename DEN density_tag DAT Example MKCLUT 0000 L15 uses density file DENL15 DAT 10 8 3 3 CHKMTF Check MTF The CHKMTF program is used to verify that the scanner is performing within specifications This program requires the special MTF test film an 8 by 10 film with a group of vertical lines a center black square and a group of horizontal lines CHKMTF serial number serial_number system serial number provide for compatibility not used 10 8 3 4 CHKXYLIN Check X Y Linearity The CHKXYLIN program is used to verify that the scanner linearity is within specifications for both the X pixels and Y lines axis This program requires the special Linearity test film a white 14 by 17 film crisscrossed by X Y lines spaced at half inch intervals This program detects the lines and measures there spacing CHKXYLIN serial number serial number system serial number provide for compatibility not used 10 8 3 5 LNADJDT Adjust X Linearity The LNADJDT program is used to adjust the scanner X pixel linearity This program should only be used by a trained Field Service person 10 9 Command Line Tools The command line tools are used to enable system maintenance and diagnostics These tools do not directly effect the scanner
125. on LUT Generation This density verification compares measured optical densities to actual densities A step wedge film see below is required along with a text file which contains dimensional information and the actual measured densities for each step See Appendix B for the definition of this file STEPWEDGE REQUIRED LS20 50 75 32 step Stepwedge 3 8 od P N 0068 749 LS50 75 85 85LF 15 step Stepwedge 4 2 od P N 0068 874 The process of density verification is simplified by the use of a batch file CHKCLUT BAT which reads the step wedge film and the reference file and compares measured optical density with actual optical density 1 Place the step wedge film into the film input slot with the notch on the top right Enter the following command line chkclut xxxx yyy where xxxx is the serial number of the machine e g 7007 and yyy is the last three digits of the filename of the reference density file Note If an error message is displayed which indicates that the CLUTXXXX DAT file is not found the Correction Lookup Table needs to be generated If this is the case proceed to section 5 4 6 LS50 75 85 85LF Correction LUT Generation Examine the file results dat You can use a text editor or enter the command line type results datimore 5 12 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS Verify that the following specifications are met LS50 75 LS85 85LF Slope Min 0 960 Max 1 040 Min 0 975 Max 1 025 Interc
126. or your version doesn t have a bulkhead connector attach the probes to TP2 on the PMT Preamp PCA Verify that the PMT High Voltage is 350 vdc or less If it exceeds 350 vdc replace the PMT Tube 5 Replace the Front cover and cover the unit with a dark cloth to minimize light leakage 6 Run DDT 1 Select option 4 Load LUT 2 Select option 1 0 4095 12 BIT LUT 3 Select option 6 Correction LUT Memory Location 4 Select option 10 Display A D Value Observe the monitor display the following will be displayed The actual values may differ minVal pixel512 30 maxVal 3675 minVal pixel512 30 maxVal 3675 5 11 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS minVal pixel 512 30 maxVal 3675 7 On the DACQ PCA adjust the OFFSET potentiometer located in the lower left corner to obtain in the minVal pixel column the decimal value of 30 2 as displayed on the computer monitor Note This POT is either R84 or R36 depending on the DACQ PCA P N Note If you can t adjust to 30 RIS and or R105 and or R103 may be misadjusted In this case proceed to 5 4 5 8 Continue with 5 4 4 LS50 75 85 85 85LF Density Accuracy Verification 5 4 4 LS50 75 85 85LF Density Accuracy Verification Note If the Data Acquisition PCA has been replaced a new Correction Lookup Table needs to be generated To create a new Correction Lookup Table proceed to section 5 4 6 LS50 75 85 85LF Correcti
127. pact only installs DRIVER DLL TOOLS and LSEXP EXE Typical same as Compact Custom recommended by default installs everything Compact plus development files LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION NOTE Read the README TXT file included on the distribution disk The installation process OVERWRITES previous registry entries The SystemRoot directory below represents the Windows NT main directory For example C WINNT the default C WINDOWS CAYOURNAME Copy the CLUT file CLUTXXXX DAT or CLTXXXXX DAT from the floppy distribution disk into the directory SystemRootNsystem32Mdrivers Use the LSDT for Windows NT Control Panel see below to enter this filename into the LSDT section of the Registry NOTE If the specified CLUT file is not found when the driver loads the driver will default to a 1 1 Correction LUT and a warning message will be logged to the Event Logger 2 3 5 Data Control Board Resources ISA Interface The Data Control Board is factory configured to use IRQ 5 I O Addresses 100 11F and has a 32 KByte window at hex address D000 D7FF If these addresses conflict with your system configuration they may be changed The hardware configuration is determined by a DIP switch and an IRQ jumper on the Data Control Board Please see APPENDIX A for instructions on how to change the IRQ level the I O address or the 32 Kbyte window address The most common alternates to the
128. r Connection Pot 115Hz LS50 75 LSSSLE LS85 75Hz LS50 75 Top of R42 to bottom pin of any R47 2 86K Ohms 3 68K Ohms 3 68K Ohms 12 CCW turns test point Left side of R34 to top of R41 R45 27 4K Ohms 27 4K Ohms 28K Ohms 16 CCW turns from fully CW 5 6 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS Reconnect all cables to the Galvo PCA Adjust Galvo Span and Galvo Offset so that the ends of the laser sweep extend past the Collection Chamber opening but not past the frame with the exception of the LS85 Standard Adjust the beam span of the LS85 Std to 11 5 inches Start step 8 over again 9 For LS50 s LS75 s and LS85LF s if the beam is positioned with the each end past the Collection Chamber opening but not hitting the frame proceed to step 10 For LS85 s if the beam is centered 1 inch and approximately 11 5 inches wide proceed to step 10 If the beam position is not correct adjust Galvo Span and Galvo Offset to reposition the beam Go back to step 8 10 Place the Lumisys LINADJ test film in the input chute with the widest bar to the left nearest the Abort button Enter LNADJDT D at the dos prompt in the tools directory Enter the Serial Number of the digitizer Press Return to continue When prompted for Lines to Skip press Return When prompted for Black White Threshold enter 1500 to replace the default value if the default value is less than 1500 Press Return The digitizer should
129. r message is displayed which indicates that the CLUTXXXX DAT file is not found the Correction Lookup Table needs to be generated If this is the case proceed to section 9 6 3 LS20 Correction LUT Generation Examine the file results dat You can use a text editor or enter the command line type results datlmore Verify that the following specifications are met 9 15 LSDT SERVICE MANUAL SECTION 9 0 LS20 Slope Min 0 960 Max 1 040 Intercept Min 0 030 Max 0 030 R R Value Min 0 9995 In the results dat file the first column is measured density The second column is actual density The third column is percentage of error Locate the highest actual density that is within the density range of the digitizer Verify that the corresponding measured density is accurate If the specifications are met the digitizer calibration is completed If the specs are not met perform section 9 6 3 LS20 Correction LUT Generation 9 6 2 LS20 Setting the Dynamic Range Note This procedure only applies to digitizers which have failed the L 20 Density Accuracy Verification Test 9 6 1 Remove the connector on J3 of the LED Interface PCA note removal of the connection causes the LED s to remain full on not in idle mode 2 Connect CH1 of the oscilloscope to TP9 of the DACQ PCA Trigger on TP8 SOS Adjust R38 on the LED PCA to obtain a peak voltage of 2 8V at TP9 If the LED s do not provide enough light for 2 8V adjust to as high a voltage as poss
130. resets the scanner driver Enter gt 9 Test CAL amp LUT Memory This writes a specified pattern to the LUT memory Responses are either FAILED or PASSED See page 7 10 Enter gt 10 Display A D Value Loads 4095 into the Cal table and displays the raw A D value from the DACQ 7 7 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS Enter gt 11 Change Parameters You can change any of the following DACQ timers Numbers given are example calculated values LS50 LS75 LS85 1 Scan Motor Clock 166667 10800 16667 2 Film Motor Clock 620 802 3343 3 Pixel Clock 235 87 88 4 Delay to First Pixel 444 1018 824 5 Pixels Per Line 1024 2048 4096 6 Lines Per Film 65535 65535 65535 7 Variable Scan Mode VARIABLE 8 Bits Per Pixel 12Bits 9 Pixel Byte Order LSB MSB 10 Reset to Defaults Select Parameters gt Enter gt 12 Start Motor You can start the motor in the specified direction Enter gt 13 Diagnostic Scan perform a specified diagnostic scan from the sub menu Enter gt 14 Test Image Memory the specified pattern is echoed to the DCB memory 4MB in a LS50 12MB in a LS75 PASSED or FAILED are the expected responses Enter 0 127 for a LS50 and 0 383 for a LS75 The test runs in 64k segments Enter 15 Stop Scan amp Eject Stops the scan in progress and ejects the film Enter gt 16 Reset HARDWARE This resets the scanner driver doesn t reload the driver the DACQ amp
131. rgent on a soft clean cloth then wipe down the covers Periodic Maintenance Maintenance Periods 2 to 4 times every 12 months WARNING IT IS IMPORTANT THAT THE LUMISCAN COVERS REMAIN ON THE SYSTEM AT ALL TIMES THE COVERS SHOULD ONLY BE REMOVED FOR SERVICE AND THEN IMMEDIATELY REPLACED THIS WILL MINIMIZE DUST ENTRY 1 Remove the LSDT top cover and vacuum the inside Remove the fan filter and clean Calibration Verification Run the diagnostic DDT From the menu choose 1 Scan File Place a film14 in the system Scan Film Y cr Wait until the film completes scanning From the menu choose 9 20 LSDT SERVICE MANUAL SECTION 9 0 LS20 7 Plot Cal Table The plot should be symmetrical and similar to Figure 9 9 with no large negative going spikes If spikes are observed or vertical lines appear in the image clean the LED assembly and the Lens with compressed air a cal dat PL Vi 5 Feh 12 1996 Max value is 4686 Min value is 3786 4086 68 4611 68 O WAAA 3936 68 3861 88 3786 68 Figure 9 8 Calibration Curve Density Accuracy and Signal to Noise Verification 1 Place the step wedge film into the film input slot with the darkest bar followed by lightest bar down Enter the following command line chkclut xxxx yyy where xxxx is the last four digits of the seri
132. rs 0062 476 0067 646 0068 219 0068 663 0068 671 proceed to step 10 6 For DACQ PCA s with an R105 potentiometer but without an R103 potentiometer 0068 711 0068 712 0069 131 0069 132 0069 156 proceed to step 8 5 16 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS 7 Note This step is only for DACQ PCA s with an R103 and an R105 potentiometer Disconnect the PMT preamp cable at J3 on the DACQ PCA Connect a DVM to the junction of R106 and pot R105 The right side of R106 Adjust R105 for a reading of 2 5V 0 1V Re connect the PMT preamp cable at J3 on the DACQ PCA f Standard Deviation RMS Noise is failing try 2 2V If this still fails try 2 0V Proceed to step 9 8 Note This step is only for DACQ PCA s with an R105 potentiometer and without an R103 potentiometer You should be able to see the step from dark to tape on the oscilloscope trace Note If the signal with the tape in is at 4V or below rotate SLOPE CCW until the tape to film transition becomes visible again If this doesn t work turn R105 CW until the tape to film transition becomes visible Adjust R105 CCW to cause instability at the junction of the tape and film CH1 The signal should jump down to the 4V rail If this does not take place rotate SLOPE CCW slightly roll the tape out of the beam path re adjust the minimum A D Count to 30 using OFFSET and roll the tape into the beam path Then try again
133. rs and the plastic motor isolator 5 Note the 45 degree orientation of the Galvo mirror on the failed Galvo Motor Use a piece of tape to duplicate this angle on the new Galvo Motor Transplant the Galvo Mirror to the new Galvo Motor duplicating the 45 degree orientation as closely as possible Replacement Re install the new Galvo motor in the reverse order Be sure to secure the Galvo Motor cable out of the way of the beam Realign the Galvo motor per Section 5 0 of this manual 8 6 Collection Cylinder Removal Usually lint can be removed from the Light Collection Cylinder opening without removing the Collection Cylinder This is done with lint free tissue and tweezers However it is sometimes necessary to remove the Cylinder if the lint contamination is severe Unplug all cables from the PMT Preamp PCA Detach the Cylinder from the frame by removing the 4 screws on either side The film guides are attached to the face of the Cylinder by 8 screws Remove the outer film guide Clean any remaining lint from the Cylinder opening Reassemble in reverse order 8 6 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 8 7 Collection Cylinder Tape Cleaning Very old LS50 s had diffusing tape over the PMT Collection Cylinder In newer systems this function is addressed in the DACQ PCA firmware so the tape is not used After cleaning the optics and negative going glitches still appear on the calibration curve debris may be on
134. rt assembly LUMISCAN LSDT SERVICE MANUAL SECTION 4 0 THEORY OF OPERATION 4 3 Optical Beam Path The LSDT contains a laser laser power supply fixed optics and mirrors a scanning galvanometer light detection system and a electronics subsystem for control The LSDT uses a 2 mW Helium Neon laser as the beam source The main beam is reflected off a 45 degree folding mirror that directs the beam through a series of focusing lenses to a galvanometer scanner galvo This galvanometer scanner has a precision mirror which reflects the beam through a folding mirror then the beam is swept across the film plane as the film is moved perpendicular to the plane The principal difference between the LSDT s are that the optics in the LS50 produces a 210 micron spot the optics in the LS75 produces a 100 micron spot and the optics in the LS85 produces a 50 micron spot and the LS85LF produces a 100 micron spot at the film plane Light transmitted through the film is collected by an integrating cylinder immediately next to the film plane The collected light is detected by a photomultiplier converted to an analog signal which is processed logarithmically amplified corrected for spatial variations in the integrating cylinder sensitivity and for temporal fluctuation in laser output then digitized by an A D converter FOLDING MIRROR GALVANOMETER COLLEC ION TUBE Figure 4 2 LUMISCAN LSDT Optical Beam Path LUMISCAN LSDT SERVICE MANUAL SECTIO
135. s in the host computer 2 2 6 Installation of Data Control Board Cable ISA Interface Remove the Data Control Board Cable a 37 pin Male Male D Subminiature cable from the accessories box Connect one end to the Data Control Board the other end to the LUMISCAN LSDT and secure both ends using a small flat blade screwdriver 2 2 7 Installation of SCSI Controller Cable SCSI Interface The SCSI Controller Cable is not included Select a SCSI Controller Cable with a SCSI 2 type connector for the digitizer LUMISCAN LSDT SERVICE MANUAL SECTION 2 0 INSTALLATION 2 2 8 Installation of Optional Film Feeder Plastic Digitizer If the LUMISCAN LSDT was purchased with the optional Film Feeder remove the Collator section from the accessory box Remove power from the digitizer While firmly holding the Collator with both hands lower it onto the front of the digitizer see Figure 2 2 Once the collator section is in place press firmly to seat This section is not secured with any hardware If the unit is to be moved or shipped the Collator section must be removed packaged and shipped separate 2 2 9 Installation of Optional Film Feeder Metal Digitizer If the LUMISCAN LSDT was purchased with the optional Film Feeder remove the Collator section from the accessory box While firmly holding the Collator with both hands lower it onto the guide and alignment pins Once the collator section is in place press firmly to seat This section is
136. s notified and it will stop the film drive motor and abort the scan Further pushing of the SCAN ABORT button will cause a toggle action which will start stop the film drive motor as well as reverse its direction Ist Press Scanning aborted and film drive motor stopped 2nd Press Motor is started in the reverse direction 3rd Press Motor is stopped Ath Press Motor is started in the forward direction 5th Press Motor is stopped 6th Press Motor is started in the reverse direction If the jam can not be cleared using the above procedure turn the power off to the LUMISCAN LSDT Remove the covers and manually clear the jam using the hand wheel to move the rollers forward or reverse as needed WARNING THIS EQUIPMENT EMPLOYS A LASER LASER RADIATION MAY BE PRESENT IF THE LUMISCAN LSDT IS OPERATED WITHOUT COVERS AVOID LASER BEAM DIRECT EYE EXPOSURE TO LASER LIGHT MUST BE AVOIDED 3 3 LUMISCAN LDST SERVICE MANUAL SECTION 3 0 SYSTEM OPERATION 3 5 Optional Film Feeder Operation The Lumiscan LSDT may be purchased with an optional Film Feeder The Film Feeder can automatically feed up to 6 films and accommodates film sizes from 18 x 24 cm up to 14 x 17 inches To digitize multiple films first press down firmly on the RESET lever see figure and ensure the green READY light is on If the Film Feeder is not reset the READY light will flash slowly in orange You must place the first film in Slot 1 the second in Slot 2 and conti
137. section 8 1 Removing the LUMISCAN LSDT Cover To remove the cover perform the following l 2 Remove the system interface cable and the A C power cable Remove the film feed module from the front of the scanner Remove the three 8 32 screws from the rear of the scanner Remove the two 4 20 hex screws from the front of the scanner Remove the main enclosure by lifting it straight up and off 2X 1 4 20 SCREW S 3X 8 32 SCREW Figure 8 1 Cover 8 1 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 8 2 Field Replaceable Units FRUs Overview This section discusses the sub systems and components in the LUMISCAN that can be replaced in the field These are called Field Replaceable Units or FRUs Certain FRUs may require some adjustments when they are replaced The following chart details all of the FRUs in the LUMISCAN that have adjustment requirements when they are replaced All adjustments are contained in Section 5 of the Service Manual Sub Assembly FRU ADJUSTMENT Optics PMT PreAMP PCA PMT PMT Tube PMT Laser Optical PMT Ref Amp Ref Amp Galvo PCA Linearity Galvo Motor Linearity Electronics DACQ PCA PMT Linearity Pinch Rollers DC Drive Motor Power Supply 2Kv Laser Supply PMT Kv PMT Supply PMT 8 2 LUMISCAN LSDT SERVICE MANUAL SECTION 8 0 REPLACEMENT PARTS 8 3 PMT The PMT sub system the PMT Tube and PMT PreAmp PCA can be replaced by following the procedure outline below The PMT PCA
138. sponse length 10 6 1 Protocol This parameter selects the scanner command protocol currently only LUMISYS is supported Default LUMISYS 10 3 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI 10 6 2 10 6 3 10 6 4 10 6 5 10 6 6 10 6 7 Inquiry Type This parameter selects the format of the Inquiry response data Legal values are LUMISYS or ANSI It is highly recommended that ANSI be used The correct value is determined by the host software Some host software will except either format Default ANSI Target SCSI ID NOT USED This parameters is provided only for compatibility with previous version of the scanner The SCSI ID is set ONLY using the rotary switch at the back of the scanner Wait for Digitize This parameter determines the behavior of the scanner when a Digitize command is received Legal values are TRUE or FALSE Most host systems prefer FALSE but a value of TRUE cause a more LUMISCAN 150 200 like behavior Default FALSE Mode This parameter determines the behavior of the scanner when a Receive Data command is processed and the is no data currently available Legal values are NORMAL or INTERRUPTABLE A setting of NORMAL causes the SCSI bus to be held busy while waiting for the image data While the SCSI bus is held no other SCSI device can be accessed during the 8 seconds that it takes to load the film for scanning A set
139. stability is attained Film reversal is performed by changing the polarity of the servo signal when the motor reverse signal is activated Interface to the Data Control Board The interface between the DCB and the DACQ is by a 37 conductor cable The signals include a bidirectional 8 bit data bus status signals from the DACQ and control signals from the DCB The DACQ is a slave in all data transfers There are two types of data transfer DACQ register R W and DCB image memory write during data acquisition During data acquisition the DACQ signals the DCB when a data word is available DATAVAIL and then the DCB reads the data a byte at a time over the interconnect writing it to the image memory with the autoincrement address counter setting the address The signal SCAN must be true for data transfer to occur which is automatic Also the status signal ISFILM must be true in order for the DACQ to assert DATAVAIL DACQ register access includes the DACQ CSR and the Cal LUT autoincrement memory SCAN must be false for this to occur 9 12 LSDT SERVICE MANUAL SECTION 9 0 LS20
140. step wedge film and the reference file and create the CLUT data file and store it in the root directory of the computer Certain naming conventions are required for the files they are described below 1 Place the step wedge film in to the center of the film input slot with the notch on the top right 5 13 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS Enter the following command line mkclut xxxx yyy where xxxx is the serial number of the machine e g 7007 and yyy is the last three digits of the filename of the reference density file The first three characters of this file must be den and the extension must be dat Thus if you enter 123 in the yyy field the batch file will look for the file den123 dat The batch file will first execute SCANFILE EXE in a special diagnostic mode which bypasses the lookup tables Then RDWEDGE EXE will extract the average values in counts of each of the steps and plot to the screen the following graph Figure 5 4 Clutxxxx dat V1 3 Jan 26 1994 Max value is 4695 Min value is 4695 66 3671 25 2647 56 1623 75 RDWEDGE pairs the counts with the measured values contained in denyyy dat The results are saved in a text file called rl dat Finally the program GENCLUT EXE uses these values to generate the actual CLUT which is saved as clutxxxx dat NOTE Whenever driver tries to load the CLUT it will always look for this file 2 Place the stepwedge back into the
141. system You will be prompted to press Ctrl C to exit the process or press enter to allow the process to repeat Press enter to repeat the process 3 After the process is repeated three times wait for the film to exit the third time Then you will be prompted to Ctrl C or continue This time Ctrl C to exit the process 4 If your system has both an R140 and a cable attached to J14 AUX I O it has HV AGC If either one of these items is missing the system does not have the HV AGC feature If your system has this feature it is necessary to repeat the entire process from step one to achieve optimum results The reason for this is that the HV AGC needs a few scans after the 5 14 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS driver is loaded to take full effect If the process has been done twice or if the system does not have the HV AGC feature proceed to the next step 5 Verify that the reported results meet the following specifications Note These stringent specifications are desired but are not requirements The actual required field performance specifications are listed in the LSDT Field Functional Specification P N 0069 231 and are excerpted in section 5 4 4 Density Verification Test The CHKCLUT process only not MKCLUT must be performed before comparing the results with the LSDT Field Functional Specification LS50 75 LS85 85LF Slope Min 0 985 Max 1 015 Min 0 980 Max 1 020 Intercept Min 0 015 Max 0 015 Min 0
142. ta dump command may be used to try and diagnose system setup of host programming problems Sample F Debug Output 10 8 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI SCSI command bytes data status code OA 00 00 00 02 00 10 00 00 OA 00 00 00 OB 00 06 00 00 00 00 36 BO 42 68 09 B7 00 OA 00 00 00 09 00 02 01 49 05 C4 01 00 04 91 00 0A 00 00 00 02 00 1001 00 0A 00 00 00 OB 00 06 00 00 00 00 18 6A 1E A9 04 7D 00 0A 00 00 00 09 00 02 01 49 05 C5 01 00 04 92 00 10 8 3Command Line Maintenance and Diagnostics Utilities The command line utilities are access through the serial interface After connecting to the serial port type Q to cause the control program LSDTISO to exit When the D gt prompt appears the utilities are ready to run A subset of standard DOS commands are available When you are finished with the utilities either reboot the system by power cycling or run the LSDTISO program NOTE Do NOT use the DEL delete command to remove files from the system flash memory file system All the files on the system are required missing files will cause errors 10 8 3 1 CHKCLUT Check CLUT The CHKCLUT program is used to verify that the CLUT file being used by the scanner is correct The CLUT file is used to adjust the pixel values to the correct optical density values If CHKCLUT reports that performance is out of specification the MKCLUT uti
143. th of 14 The LUMISCAN 85 can digitize up to 5120 pixels over a film width of 10 High Positional Accuracy A precision galvanometer scanner is utilized to produce a line scan that is perpendicular to the direction of film travel This provides the positional accuracy required for high resolution digitizing Precision Optics The optical system is designed to provide diffraction limited performance over the scan envelope Proprietary Light Collection System This sets the LUMISCAN apart from other systems The light collection system permits collection angles of over 150 degrees at each point allowing measurements to be extended to very dense regions The collection system coupled with the detector electronics leads to a true and precise digital representation of the image information on the film LUMISCAN LSDT SERVICE MANUAL INTRODUCTION This document contains a basic technical overview of the LUMISCAN LSDT The optics digital hardware and software subsystems are explained as well as the systems functionality and general user operation Unpacking hardware and software installation system specifications service adjustments and troubleshooting are also included This document is intended for users who may need to understand the principles of operation for the LUMISCAN LSDT REFERENCE DOCUMENTS LUMISCAN 50 75 85 Operators Reference Guide P N 0061 494 LUMISCAN LSDT Service Manual P N 0061 501 LUMISCAN 20
144. the Galvo Driver PCA The beam should then point to the middle of the light collection chamber opening Manually roll in a 14 inch wide dark film into the light opening to serve as a backdrop to view the beam If there is no beam hitting the film the Laser or the Laser Power Supply has failed If the Laser is functioning it is possible that there is no Photo Multiplier Tube output If the PMT is providing the proper output the remaining possibilities are a Data Control PCA resource conflict or a failed Data Acquisition PCA 7 1 LUMISCAN SERVICE MANUAL SECTION 7 0 DIAGNOSTICS 7 2 2 No Laser Output If there is no Laser Output the Laser or the Laser Power Supply has failed To determine which of these components has failed turn the scanner off then unplug the Laser and short out the Laser leads If there is a spark the Laser has failed If there is no spark the Laser Power Supply has failed 7 2 3 No Photo Multiplier Tube Output Remove the main cover and unplug power to the Galvo Driver PCA The beam should then point to the middle of the light collection chamber opening Manually roll in a 14 inch wide dark film into the light opening to serve as a backdrop to view the beam If there is no beam hitting the film the Laser or the Laser Power Supply has failed If the Laser is emitting light remove the film from the beam path Using a Digital Volt Meter set to DC Volts check the PMT Output Voltage by measuring the voltage from the top
145. ting of INTERRUPTABLE returns a BUSY condition and the host must poll until data is available Most systems will scan correctly with either value but general host system performance could be affected The correct value is determined by the host system Default NORMAL Film Present The setting of the parameters indicates to the scanner the presence of a film present sensor in the hardware The factory value for this parameters should not be changed except by a Field service person installing a hardware upgrade Default depends are actual hardware TRUE if detector is present in hardware Request Sense Length This parameter allows the length of the response to a Request Sense command to be overridden The correct value is determined by the host software Don t change this parameters unless your host software requires it Default 0 10 4 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI 10 7 10 7 1 Functional description The ISO board contains 4 sections which are explained separately below CPU The CPU section contains the 386EX processor the Altera EPM7128E and data buffers The 386EX processor operates at 20MHz using the 40MHz system clock It provides several integrated peripheral functions which help to reduce the chip count The ISO board uses the following peripherals 1 Chip select Unit The chip select unit controls the mapping of the memory space CSO selects the flash chip U28
146. to use the ISA Interface Emulator which is covered in section 2 4 Space will be required to save digitized images on disk Most films will require 2 5 to 10 5 MBytes of disk space to store the digital image depending on the resolution at which the film is digitized The LUMISCAN 85 can generate images up to 64 MBytes in size and the LUMISCAN 75 can generate 40 MBytes 2 3 1 Operating System ISA Interface To install the LUMISCAN 20 50 75 85 ISA host software you are required to have one of the following ISA Interface Operating Systems installed on your PC and at least 3 0 MBytes of hard disk space available for the creation of a directory and transfer of files from floppy distribution disk ISA Operating System Requirements DOS 5 0 or higher Windows NT 4 0 or higher Windows 3 1 Windows 3 1 1 Windows for Workgroups Windows 95 98 2 3 2 Density Correction LUT Files ISA Interface Both the DOS and the Windows NT LSDT drivers automatically load a Density Correction LUT CLUT File during the driver loading process When shipped from the factory this file is named CLUTXXXX DAT or CLTXXXXX DAT where XXXX or XXXXX is the serial number of the digitizer the CLUT file pertains to The CLUT file is shipped on the data floppy disk This CLUT is customized for a particular digitizer For DOS the file must be the root directory C and it must be the ONLY CLUT file there For Windows NT the file must be in a specific
147. trI gt S then any key to resume Examine each screenful and verify that every reported count is 256 Hit any key such as the spacebar to display the next screenful repeat for the entire file and until the DDT menu returns Verify that the last line displays the following message Total Occurrences 1048576 which is 1024 pixel X 1024 lines When complete the screen returns to the main menu Repeat this entire test except in the submenu choose 6 Flat Field Pattern When the results of HIST12 are displayed verify that the reported count for every value is 0 except for 1285 which should have a count of 1048576 Choose 11 Change Parameters Select 9 LSB MSB This will reverse the order to MSB first Hit enter to return to main menu Repeat the diagnostic scan with mode 7 Diagnostic Pattern Repeat the HIST12 analysis This time since the byte ordering has been reversed the results reported by HIST12 should be as follows As the numbers scroll past you should see 16 groups of 16 consecutive bins with 4096 counts each and all other bins with O counts The groups will be located at bins 0 through 15 256 through 271 512 through 527 and ending with 3840 through 3855 Choose 11 Change Parameters Select 9 MSB LSB again to restore the byte ordering to the usual LSB first Select 8 Bits Per Pixel This will toggle between 12 bit mode and 8 bit mode This will cause only the least significant byte of each value to be stored resulting
148. tructions for the LUMISCAN 5 2 1 NOTE Laser light is present Observe all warnings and cautions listed in the Introduction Installation and Maintenance sections of this manual Any component change in the optical path will probably require re alignment and adjustment of all subsequent elements from that point on to the PMT sub system All optical surfaces are sensitive and delicate Follow the Optics Cleaning instructions in this Section of the manual Optical Adjustments NOTE The following alignment procedures are not required unless some component has been replaced Alignment should not be attempted unless the service engineer has been factory trained The following is a list of the Optical adjustments See Figure 5 1 Laser Beam Splitter LS85 only Ref Amp PCB LS85 only Ist 45 degree Folding Mirror Lens Assembly Galvo Scanner Folding Mirror MboMPb A OU P o Remove the LUMISCAN main cover to gain access to the Optics Refer to Section 8 0 of this manual 5 2 LUMISCAN LSDT SERVICE MANUAL SECTION 5 0 SERVICE ADJUSTMENTS FOLDING MIRROR GALVANOMETER COLLECTION LASER TUBE Figure 5 1 LUMISCAN LSDT Optical Beam Path 1 Laser Ensure that the Laser is on Observe that the Laser beam is centered on the corner mirror 2 Beam Splitter If the system has a Beam Splitter adjust the beam splitter assembly so that the beam passes through the beam splitter mirror and is centered into the
149. ts for CPU commands DMA channel 1 is used for the SCSI transfers The SCSI ID switch S1 is a 16 position selector Settings O to 7 are for SCSI ID 0 to 7 without termination Settings 8 to F are for SCSI ID 0 to 7 with active termination on The signal DISCON switches the active terminator at U29 on or off JP4 selects the different terminator power configurations see table from schematic 10 7 LUMISCAN LSDT SERVICE MANUAL SECTION 10 THEORY OF OPERATION INTERNAL SCSI 10 8 LSDT INTERNAL SCSI DIAGNOSTICS There are several diagnostic and maintenance programs that may be executed to keep the scanner performance optimal At this time all diagnostics must be run by using internal command line utilities To access the microprocessor a terminal or a computer running a terminal emulation program should be connected to the serial port Diagnostics like the system software are stored on the flash disk on the Internal SCSI PCA The diagnostics are accessed by way of a user supplied terminal terminal emulator program through the Host serial port The connection to the LSDT is by way of a4 pin RJ 11 telephone plug connected to J4 located at the rear of the scanner An adapter is then required to connect to the Host Serial Port 10 8 1Serial Port Setup At the back of the scanner next to the SCSI connector is a phone jack RJ 11 connector for an RS 232 serial line This serial line uses a 3 wire connection Only the transmit rece
150. ue If necessary use tweezers to remove stubborn pieces of lint In extreme cases it may be necessary to remove the chamber for cleaning LUMISCAN SERVICE MANUAL SECTION 6 0 PERIODIC MAINTENANCE 6 2 4 Perform Scan Linearity Adjustment Reference 5 3 of Chapter 5 6 2 5 Perform PMT Sub System Adjustment Reference 5 4 1 5 4 2 5 4 3 5 4 4 of Chapter 5 6 2 6 Plot CAL Table Run the diagnostic DDT From the menu choose 1 Scan File Place a film 14 LS50 75 85LF 10 LS85 in the system Scan Film Y Yes Wait until the film completes scanning From the DDT menu then choose 7 Plot Cal Table The plot should have the characteristic bell shape similar to Figure 6 3 Verify that the reported maximum value is approximately 4060 counts and the minimum value is approximately 3600 Verify that the curve is smooth with no large negative going spikes If there are any spikes examine the optical path for obstructions On older systems it may be necessary to replace the diffusion tape across the collection chamber slot PL V1 3 Aug 83 1993 Max value is 4078 Min value is 3845 4078 08 4019 75 3961 58 7777777700077 UR AMNES ERU e 3983 25 7777777 Prisoner acer naan EE 3845 88 Figure 6 3 Calibration Curve This page intentionally left blank 6 3 LUMISCAN 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
151. unt each data value can be seen to be the average of four CCD pixels Delay to 1st pixel is unchanged In XY averaging mode two pixels are averaged in X along with four lines Taking into account the CCD odd even averaging each data value is the average of 16 4x4 CCD pixels In order to retain the 1 1 aspect ratio the film speed must not change Operating Modes The operation of the DACQ is controlled by means of the MODE field in the DACQ CSR and the SCAN signal When SCAN is false the DCB can access the lookup table memory When SCAN is set to true the DSP operates according to the current mode To set or change the mode write the MODE field and then assert the DACQRES bit in the DACQ CSR Currently seven operating modes are defined They are described as follows 9 10 LSDT SERVICE MANUAL SECTION 9 0 LS20 Mode 0 Not Used Mode 1 Scan With No Calibrate No CLUT and No Upper limit SLUT This is a special mode used only in the generation of the Correction LUT In this mode the result is the direct A D output with only the Calibration Table applied Mode 2 Scan With Calibrate Only This is the normal scan mode In this mode the A D output is passed through the CLUT then the calibration table then checked for lower limit passed through the SLUT and finally passed through the Output LUT and written to the data register The Calibration Table generated using the current timing parameters as described above Mode 1 DATAVAIL

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