OHAUS Catapult 1000 Service Manual
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OHAUS Catapult 1000 Service Manual

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SERVICE MANUAL
Catapult™ 1000 Scales
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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  • Page 1 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com SERVICE MANUAL Catapult™ 1000 Scales...
  • Page 3 SERVICE MANUAL Catapult™ 1000 Scales The information contained in this manual is believed to be accurate at the time of publication, but Ohaus Corporation assumes no liability arising from the use or misuse of this material. Reproduction of this material is strictly prohibited.

  • Page 5: Table Of Contents

    Testing ........................4-1 Power Test.........................4-1 Performance Tests Using a Scale Base ..............4-1 Calibration Retention Test ..................4-1 Repeatability Test ......................4-2 Off-Center Load Test ....................4-4 Off-Center Load Adjustment ..................4-5 Linearity Test ......................4-6 CHAPTER 5 PARTS LISTS & DIAGRAMS Catapult 1000 Scale: Parts ..................5-2...
  • Page 6 Power Cable and Load Cell leads, soldered to the Printed Circuit Board .....3-3 Open Battery Compartment door by pressing the two inset latch levers ....3-4 Scale drawing of Catapult 1000 Load Cell and Weighing Pan......4-6 Catapult 1000 Scale: Parts ...................5-2...

  • Page 7: Chapter 1 Getting Started

    INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus Catapult™ 1000 Scales. The contents of this manual are contained in five chapters: Chapter 1 Getting Started – Contains information regarding service facilities, tools and test equipment, measuring masses, specifications, and the mechanical and electronic functions of the scale.

  • Page 8: Tools And Test Equipment Required

    GETTING STARTED CHAPTER 1 TOOLS AND TEST EQUIPMENT REQUIRED The service shop should contain the following equipment: 1. Standard hand tools. 2. Digital Voltmeter (DVM). 3. Load Cell Simulator optional. SPECIFICATIONS TABLE 1-1. SPECIFICATIONS Specification C11P9 C11P20 C11P75 Capacity x readability, d 9 kg x 0.05 20 kg x 0.01 75 kg x 0.05...

  • Page 9: Operation

    GETTING STARTED CHAPTER 1 OPERATION This section contains information on the basic operation of the Catapult™ 1000 Scale. Exploded view drawings in Chapter 5 identify all components. 1.5.1 Power Supply Power to the scale is supplied by a 9 V dc, 100mA Power Adapter, or by 3 “C” size (LR 14) alkaline batteries.

  • Page 10: Basic Functions

    GETTING STARTED CHAPTER 1 1.5.3 Basic Functions Power Up Test: When ON/ZERO Off button is pressed the scale turns on, all display segments appear, followed by the software version. The display then resets to zero. Zero Function: By pressing ON/ZERO Off, the display returns to zero. When adding additional mass, press ON/ZERO Off repeatedly until the scale’s full capacity is reached.

  • Page 11: Calibration

    GETTING STARTED CHAPTER 1 CALIBRATION For best results, calibrate the scale at regular intervals. Correct calibration weights must be available before starting calibration. (See Specification Table). Multiple weights may be used to equal the required calibration weight. Calibration is unavailable in Dynamic Weighing Mode. CAUTION! BE CAREFUL HANDLING CALIBRATION WEIGHTS: THEY ARE VERY HEAVY.
  • Page 12 GETTING STARTED CHAPTER 1...

  • Page 13: Chapter 2 Troubleshooting

    5. Repair or replace the defective part. NOTE: If more than one symptom is observed, approach one area at a time, and remember that the symptoms may be interrelated. If a problem arises that is not covered in this manual, contact Ohaus Corporation for further information.

  • Page 14: Diagnosis

    CHAPTER 2 TROUBLESHOOTING 2.3.1 Diagnosis TABLE 2-1. DIAGNOSTIC GUIDE TABLE Symptom Possible Cause(s) Remedy Scale will not turn on No power to scale Verify connections and voltage. Battery power used up Connect power and replace batteries. Poor accuracy Improper calibration Perform calibration.

  • Page 15: Checking The Load Cell's Signal

    Supply & Battery Connector Figure 2-2. Catapult 1000 PCB connections The EXE+ and EXE– wires should be connected to the PCB, and the SIG+ and SIG– wires must be disconnected. Record the colors for each wire connection before disconnecting. (See Table 2-2 for typical color code for SD Series.) TABLE 2-2.

  • Page 16: Resistance Test

    CHAPTER 2 TROUBLESHOOTING 2.4.1 Output Voltage Test 3. Measure the voltages on +SIG and –SIG wires, disconnected from PCB. Note: Measurements must be made with these wires disconnected from the PCB. These measurements represent the output of the Load Cell. Record measurements at Zero Load, 50% and full scale capacities.

  • Page 17: Testing The Printed Circuit Board (Pcb)

    CHAPTER 2 TROUBLESHOOTING Testing the Printed Circuit Board (PCB) The PCB can be tested by measuring voltages and by using a simulator. The simulator replaces the Load Cell during testing and is a useful tool for diagnosing problems. 2.5.1 PCB Voltage Measurements Note: Prior to the voltage measurements, test and install new batteries.

  • Page 18: Calibration Test

    CHAPTER 2 TROUBLESHOOTING Testing the Printed Circuit Board (PCB) 2.5.4 Calibration Test This test calibrates the scale using the simulator and can verify that the Main PC Board is functioning properly or improperly. 1. With the scale on, press and hold UNITS Cal to perform a calibration. (See Section 1.8.) 2.

  • Page 19: Chapter 3 Maintenance Procedures

    If, after the replacement of any component, the scale is still non-functional and no other information on the subject is available in the manual, contact your local Ohaus office or contact Ohaus Corporation by visiting www.ohaus.com. In the United States call Ohaus...

  • Page 20: Replacing Load Cells

    CHAPTER 3 MAINTENANCE PROCEDURES 3.2.1 Replacing Load Cells Repairs are not recommended on the Catapult 1000 scale. Some component parts may be replaced. Replacement is recommended rather than repairing. Load Cells may need to be replaced because of scale instability, or because the scale does not calibrate or repeat, or because it is physically broken or displays an error code.

  • Page 21: Printed Circuit Board (Pcb) Replacement

    CHAPTER 3 MAINTENANCE PROCEDURES 3.2.2 Printed Circuit Board (PCB) Replacement Replace the Printed Circuit Board (PCB) for any of the following reasons: – Display is defective; characters missing or partial display. – Scale fails to calibrate properly. – Display is erratic or unstable. –...

  • Page 22: Battery Replacement

    CHAPTER 3 MAINTENANCE PROCEDURES 3.2.3 Battery Replacement 1. To replace the Type C (LR14) batteries, press the inset latch lever in the middle of the Bottom Housing. 2. Note the proper direction for inserting new batteries, printed on the inside of the Battery Compartment door.

  • Page 23: Chapter 4 Testing

    CHAPTER 4 TESTING TESTING Before and after servicing the scale, operational and performance tests should be made to determine if it meets specifications. Turn the scale ON and allow it to warm up for at least 20 minutes before performing these checks. The masses used for calibration should be ASTM Class F or OIML Class M1 tolerance or better.

  • Page 24: Repeatability Test

    CHAPTER 4 TESTING Repeatability Test Repeatability is the Standard Deviation of a set of similar weight readings. Requirements: – To perform this test a single mass must be used for all readings. – The test mass should be approximately ½ of the capacity of the scale. Before starting a repeatability test, set up the scale as follows: Set Up: Enter the menu and set the scale to display the same units as the performance specifications.

  • Page 25: Repeatability Worksheet

    CHAPTER 4 TESTING Repeatability Test TABLE 4-1. REPEATABILITY WORKSHEET Reading Delta = Reading – Mean Delta x Delta n = number of Reading Mean = Sum of readings / 10 Delta = Reading – Mean Standard Deviation = Square Root of (sum of (Delta x Delta) / 9) 5.

  • Page 26: Off-Center Load Test

    CHAPTER 4 TESTING Off-Center Load Test The Off-Center Load Test is used to determine whether displayed weight values are affected by moving the sample to different areas of the Pan. 1. Place half of the scale’s capacity in the center of the Pan. 2.
  • Page 27 Weighing Pan’s center, with points A – D indicated Figure 4-1. Scale drawing of Catapult 1000 Load Cell and Weighing Pan. 4. Place the test weight in the center of the Weighing Pan. 5. Tare the balance. 6. Move the weight to point A and record the reading.

  • Page 28: Linearity Test

    CHAPTER 4 TESTING Linearity Test This test is used to determine the linearity of the unit throughout its operating range. The masses used to perform this test can be utility masses. NOTE: The scale must pass the Repeatability and Off Center Load tests, and be calibrated, before the Linearity Test may be performed.

  • Page 29: Chapter 5 Parts Lists & Diagrams

    CHAPTER 5 PARTS LISTS & DIAGRAMS This section of the manual contains exploded views for the Catapult 1000 Scales. The exploded view drawings are designed to identify the parts which can be serviced in the field. NOTE: In all cases where a part is replaced, the scale must be thoroughly checked after the replacement is made.

  • Page 30: Catapult 1000 Scale: Parts

    CHAPTER 5 PARTS LISTS & DIAGRAMS CATAPULT 1000 SCALE: Parts Catapult 1000 Figure 5-1. Catapult 1000 Scale: Parts.

  • Page 31: Catapult 1000 Scale: Parts

    CHAPTER 5 PARTS LISTS & DIAGRAMS CATAPULT 1000 SCALE: Parts TABLE 5-1. CATAPULT 1000 SCALE: Parts Drawing Item Description Pan, Stainless Steel (Optional) Pan, Plastic Load Cell Set Function Label Main PCB with LCD Hardware Kit PCB Cover Battery Cover Rubber Feet (4) Adapter –...
  • Page 32 CHAPTER 5 PARTS LISTS & DIAGRAMS...
  • Page 34 *80252209* P/N 80252209 SERVICE MANUAL: CATAPULT™ 1000 SCALES Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com...

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