OHAUS SCOUT Service Manual

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OHAUS SCOUT Service Manual Manual pdf 3 page image

iTABLE OF CONTENTSCHAPTER 1 INTRODUCTION1.1 Introduction ............................................................................................. 1-11.2 Service Facilities ..................................................................................... 1-11.3 Tools and Test Equipment Required ...................................................... 1-21.3.1 Special Tools and Test Equipment List .......................................... 1-21.3.2 Standard Tools and Test Equipment List ........................................ 1-21.4 Test Masses Required ............................................................................ 1-21.5 Specifications .......................................................................................... 1-3CHAPTER 2 THEORY OF OPERATION2.1 Balance Operation .................................................................................. 2-12.1.1 Operation ........................................................................................ 2-12.1.1.1 Turning the Balance ON ............................................................ 2-12.2 Transducer Operation ............................................................................. 2-22.3 Printed Circuit Board Circuit Description ................................................ 2-32.3.1 Power Supply.................................................................................. 2-32.3.2 ON/Off Circuitry .............................................................................. 2-32.3.2.1 Turn On Circuitry ....................................................................... 2-32.3.2.2 Turn Off Circuitry ....................................................................... 2-32.3.3 Low Voltage Detector ..................................................................... 2-42.3.4 Temperature A/D Converter ........................................................... 2-42.3.5 Full Bridge Weight A/D Convertor ................................................... 2-42.3.6 Half Bridge Emulator....................................................................... 2-52.3.7 Microprocessor U1.......................................................................... 2-52.3.8 EEPROM U6................................................................................... 2-52.3.9 Display Driver U7 ............................................................................ 2-5CHAPTER 3 TROUBLESHOOTING3.1 Troubleshooting ...................................................................................... 3-13.2 Diagnostic Guide .................................................................................... 3-13.2.1 Diagnosis ........................................................................................ 3-13.3 Error Codes ............................................................................................ 3-4CHAPTER 4 MAINTENANCE PROCEDURES4.1 Preventive Maintenance ......................................................................... 4-14.1.1 Preventive Maintenance Checklist .................................................. 4-14.2 Testing .................................................................................................... 4-24.2.1 Operational Test ............................................................................. 4-24.2.1.1 Segment Display Test ............................................................... 4-24.2.2 Calibration....................................................................................... 4-34.2.2.1 Calibration Masses .................................................................... 4-34.2.2.2 Calibration Procedure ................................................................ 4-3Page No.