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LI-3100 Area Meter Service Manual

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LI-3100 Area Meter Service Manual LI-3100 Area Meter Service Manual Publication No. 8302-0032 February, 1983 Revised September, 1995 LI-COR, inc. 4421 Superior Street P.O. Box 4425 Lincoln, Nebraska 68504-0425 USA Telephone: 402-467-3576 FAX: 402-467-2819 Toll-free 1-800-447-3576 (U.S. & Canada) © Copyright 1983. LI-COR, inc. Introduction This latest edition of the LI-3100 Service Manual was revised in September, 1995. The original editions covered all instruments with serial numbers up through 1009. This new edition adds Section III, which contains the circuit descriptions and diagrams for instruments with serial numbers 1010 and above. Section III also contains information on replaceable parts for these newer instruments. For older instruments, this information is listed in Appendices A through E located between Section II and III. Important Notice These technical documents and drawings are given in good faith solely for the purpose of servicing the LI-3100 Area Meter. This information is a proprietary product of LI-COR, inc., Lincoln, Nebraska, USA, and shall not be released nor be disclosed, duplicated, or used for the purpose of design or manufacturing, without the express written permission of LI-COR. Table of Contents Section I. General Information 1.1 Introduction................................................................................................................ ................................... 1-1 1.2 Description .................................................................................................................................................... 1-1 1.3 Ordering Replacement Parts ......................................................................................................................... 1-1 1.4 Theory of Operation......................................................................................................... ............................. 1-1 1.5 Functional Diagram Description.............................................................................................. ..................... 1-2 1.6 Resolution Options.......................................................................................................... .............................. 1-3 Section II. Circuit Description (S/N 1009 and Below) 2.1 Power Supply ................................................................................................................................................ 2-1 2.2 PLL and Lamp Driver......................................................................................................... .......................... 2-1 2.3 Scanner Control and Count Detection .......................................................................................................... 2-2 2.4 Counter Logic and Display ........................................................................................................................... 2-4 2.5 LI-3000A Console Interface ......................................................................................................................... 2-4 2.6 Troubleshooting Aids 2.6a Power Supply Regulator Troubleshooting .......................................................................................... 2-5 2.6b Line Scanner Control Circuitry Troubleshooting ................................................................................ 2-5 Functional Diagram Schematic 1. Power Supply Schematic 2. PLL and Lamp Driver Schematic 3. Scanner Control and Count Detection Schematic 4. Counter Logic and Display Timing Diagram Component Layouts APPENDIX A - A1 Control Assembly Parts List ................................................................................................ A-1 APPENDIX B - A2 Line Scanner Assembly Parts List ....................................................................................... B-1 APPENDIX C - A3 Display Assembly Parts List ................................................................................................ C-1 APPENDIX D - A4 Chassis Parts List ................................................................................................................. D-1 APPENDIX E - Specifications.............................................................................................................. ............... E-1 Section III. Circuit Description (S/N 1010 and Above) 3.1 Power Supply ................................................................................................................................................ 3-1 3.2 PLL and Lamp Driver......................................................................................................... .......................... 3-1 3.3 Scanner Control and Count Detection .......................................................................................................... 3-2 3.4 Counter Logic and Display ........................................................................................................................... 3-4 3.5 LI-3000A Console Interface ......................................................................................................................... 3-4 3.6 Troubleshooting Aids 3.6a Power Supply Regulator Troubleshooting .......................................................................................... 3-5 3.6b Line Scanner Control Circuitry Troubleshooting ................................................................................ 3-5 Schematic 5. Primary Wiring Diagram Schematic 6. Main Board Schematic 7. Main Board Schematic 8. Video Board Video Board Timing Diagram Video Board Component Layout Main Board Component Layout Warranty Section I General Information 1.1 Introduction This section contains general information concerning the LI-COR LI-3100 Area Meter. Included is a description of the instrument and the theory of operation. The operation instructions for the LI-3100, which are given in the LI-3100 Instruction Manual, are not duplicated in this manual. 1.2 Description The LI-COR LI-3100 Area Meter is an instrument capable of measuring the area of non-transparent items. The LI-3100 is available with area sensing resolutions of 1.0 mm2 or 0.1 mm2. Capability for both 1.0 mm2 and 0.1 mm2 area sensing resolution can be provided on the same instrument. The LI-3100 consists of a transparent belt conveyer mechanism, an object illumination lamp, and area unit scanning, counting, and display circuitry. Serial numbers for the LI-3100 Area Meter are designated as LAM XXX-YYMM where LAM means Laboratory Area Meter. XXX is a number which identifies a particular instrument. The YYMM identifies the year and the month of manufacture of the instrument. 1.3 Ordering Replacement Parts To order a replacement part please be sure to send the following information: the instrument model number, the instrument serial number, the part reference designator and part description. If the part is not listed in this manual, give a description of the part, its function and location within the instrument, along with the instrument model number and the instrument serial number. Send orders for parts to: LI-COR inc., P.O. Box 4425, 4421 Superior Street, Lincoln, Nebraska, 68504, USA. 1.4 Theory of Operation The method by which the LI-3100 measures area is best understood by examining the technique for manual area measurement. The manual area measurement technique requires tracing the outline of the sample on grid paper and counting the squares where the sample covers fifty percent or more of the area of an individual grid cell. Each grid cell would be methodically examined, keeping account of each grid row and each grid column. The width of the sample at a given point is determined by the number of grid cells covered across a row. The number of grid cells covered in a column determines the length. The resolution of this measurement technique is a function of the area represented by each grid cell. If the 50% criterion for the acceptance or rejection of grid cells were not used, the result would be non-linearity in the measured area. In other words, if the grid cells with fifty percent or more area covered were not counted, the 1-1 result would be inconsistent data on repeated measurements. Similarly, if the sample were cut into pieces and the individual pieces summed, the results would likely not equal the measurement of the whole sample. The function of the LI-3100 Portable Area Meter is to use electronic methods to simulate a grid pattern on the leaf. Samples are placed between the guides on the lower transparent belt and allowed to pass through the instrument. As items travel under the 15 watt fluorescent light source, the image is reflected by a system of three mirrors to a solid state scanning camera within the rear housing. The mirrors are mounted on the instrument base plate. Two are visible under the transparent belts. The third is within the rear housing. The solid state scanning camera is a self-scanning photodiode array with 256 elements. Each photodiode element is used to examine a representative grid cell across the width between the sample guides. When the item being measured blocks the light from reaching a photodiode element, an area unit is accumulated on the display. The solid state camera scans across the width between the sample guides, accumulating area units for each grid cell where more than 50 percent of the light is blocked. The sample is advanced by the transparent conveyer belt to allow a new row of grid cells to be examined. An important aspect of this electronic measurement technique is that it requires
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