OHAUS FD SERIES Service Manual
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Summary of Contents for OHAUS FD SERIES
- Page 1 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com FD SERIES SCALES SERVICE MANUAL...
- Page 3 SERVICE MANUAL 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.
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Page 5: Table Of Contents
......................2-1 Scale Setup and Examination ..................2-1 Preliminary Checks ....................2-1 Troubleshooting Tables ....................2-1 FD Series Scales Error Code Table ................2-5 CHAPTER 3 SCALE TESTING AND CALIBRATION Testing and Calibration ....................3-1 Testing the AC Adapter ....................3-1 Testing the Membrane Switch .................. - Page 6 4.5.1 Overload Protection Stop Adjustment ..............4-6 Replacing the Battery ....................4-7 CHAPTER 5 PARTS LISTS Parts Lists ......................5-1 FD Series Scales Exploded View ................. .5-2 APPENDIX A SERVICE MENU Introduction ......................A-1 Entering Service Menu ....................A-1 Navigation ......................A-1 Capacity ......................
- Page 7 Geographical Adjustment Values ............A-4 LIST OF ILLUSTRATIONS FIGURE NO. TITLE PAGE FD Series Scales Membrane Switch Wiring Diagram ........ 3-1 FD Series Scales Interconnection Diagram ..........3-3 Segment Display ................3-8 Standard Deviation Worksheet.............. 3-9 Calculation of Standard Deviation ............3-9 Sample Calculation of Standard Deviation ...........
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Page 9: Chapter 1 Introduction
CHAPTER 1 INTRODUCTION 1. INTRODUCTION This service manual contains instructions for the diagnosis and repair work to be performed by Ohaus Dealers or Ohaus authorized service centers. Knowledge of the operation of the Scale is assumed. Instruction manuals may be required with this service manual. For complete information on operation, refer to the Instruction Manual. -
Page 10: Tools And Equipment
NOTE: Adapters required for servicing are location dependent. 1.3 CALIBRATION MASSES REQUIRED The masses required to test the FD Series Scales must meet the requirements of ASTM Class 4 or OIML Class F2. The mass values are listed in Table 1-1. Bolded values are default settings. -
Page 11: Chapter 2 Diagnosis
CHAPTER 2 DIAGNOSIS DIAGNOSIS This section contains information needed to properly evaluate the reported problem and diagnose its cause. 2.1 SCALE SETUP AND EXAMINATION Set up the scale according to the Instruction manual. Allow the scale to stabilize to room temperature. Examine the scale for signs of corrosion or physical damage. -
Page 12: Scale Will Not Turn On Using Battery Power
CHAPTER 2 DIAGNOSIS TABLE 2-2 SCALE WILL NOT TURN ON USING BATTERY POWER. SYMPTOM PROBABLE CAUSE REMEDY Scale will not turn on using Battery discharged or de- Refer to Section 3.5 and test the battery. battery power. fective. Replace if necessary. See Repair Proce- dure 4.6. -
Page 13: Scale Does Not Respond To Front Panel Controls
CHAPTER 2 DIAGNOSIS TABLE 2-3 SCALE DOES NOT RESPOND TO FRONT PANEL CONTROLS. PROBABLE CAUSE REMEDY SYMPTOM Membrane Switch is defec- Refer to Section 3.2 and test the Mem- Scale does not respond to front tive. brane switch. Replace if necessary. panel controls. -
Page 14: Cannot Calibrate The Scale
CHAPTER 2 DIAGNOSIS TABLE 2-5 BALANCE READING INCORRECT OR UNSTABLE. SYMPTOM REMEDY PROBABLE CAUSE Perform Service Calibration in Appen- Balance reads incorrectly. Needs calibration. dix A. If calibration fails, refer to Table 2-6. Test the Load Cell, refer to Section 3.3. Balance reading unstable. -
Page 15: Fd Series Scales Error Code Table
CHAPTER 2 DIAGNOSIS 2.4 FD SERIES SCALES ERROR CODE TABLE The FD Series Scales is equipped with software which will display an error condition when it occurs. Review the listed codes and follow instructions to correct the problem. TABLE 2-7. FD SERIES SCALES ERROR CODES... - Page 16 CHAPTER 2 DIAGNOSIS 2.4 FD SERIES SCALES ERROR CODE TABLE (Cont.) The FD Series Scales is equipped with software which will display an error condition when it occurs. Review the listed codes and follow instructions to correct the problem. TABLE 2-7. FD SERIES SCALES ERROR CODES...
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Page 17: Chapter 3 Scale Testing And Calibration
This section of the manual contains testing procedures of the individual replaceable components and the scale. Before and after servicing the FD Series Scales, an operational test and various performance tests should be made to ascertain whether or not the scale meets specifications. -
Page 18: Testing The Load Cell Assembly
CHAPTER 3 SCALE TESTING AND CALIBRATION 3.3 TESTING THE LOAD CELL ASSEMBLY This section contains three methods of testing the Load cell. 3.3.1 Ramp Test Refer to Appendix A and perform the Ramp Test. If the Ramp Test passes, continue with the rest of this procedure. -
Page 19: Load Cell Output Readings
1.2 +1.5 no load + 2.2 no load + 4.4 6 kg 0.4 +1.5 no load + 2.0 no load + 4.0 15 kg 0.2 +1.5 no load + 2.5 no load + 5.0 Figure 3-2. FD Series Scales Interconnection Diagram. -
Page 20: Testing The Main Pc Board
CHAPTER 3 SCALE TESTING AND CALIBRATION 3.4 TESTING THE MAIN PC BOARD The Main PC Board 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. 3.4.1 Main PC Board Voltage Measurements Prior to making the voltage measurements, the battery should have been fully charged and tested. -
Page 21: Simulator Testing
CHAPTER 3 SCALE TESTING AND CALIBRATION 3.4.2 Simulator Testing To perform these tests, the use of a Simulator is required. The basic function of a Simulator is to simulate the output of a full bridge Load Cell allowing the scale to be separated from the Load Cell for the purposes of troubleshooting and calibration. -
Page 22: Testing The Battery
If left connected to the AC Adapter all of the time, the battery receives a small charge when the battery voltage is low, service life can be many years. The FD Series Scales can be operated for up to 120 hours per charge. Battery life can be maximized by frequent charging. -
Page 23: Battery Capacity
CHAPTER 3 SCALE TESTING AND CALIBRATION 3.5.2 Battery Tests (cont.) 3. With the AC Adapter connected, measure the battery voltage at the battery terminals; the voltage should be approximately 6 to 7 Volts dc when charging. The voltage should be approximately 6.4 Volts dc ten minutes after charging stops. -
Page 24: Performance Tests
Figure 3-3 is a full display test. Figure 3-3. Segment Display. Accurate performance of the FD Series Scales is determined by a series of three performance tests, Repeatability Test, Off-Center Load Test and Linearity Test. These tests are used to evaluate the scale performance before and after repairs. - Page 25 CHAPTER 3 SCALE TESTING AND CALIBRATION 3.6.2 Repeatability Test (Cont.) σ Figure 3-4. Standard Deviation ( ) Worksheet. Reading Weight (kg) Weight - Mean (Weight – Mean) SUM = SUM = Mean = SUM/10 Variance = SUM/9 σ √ Mean = = = = = = Variance σ...
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Page 26: Off-Center Load Test
CHAPTER 3 SCALE TESTING AND CALIBRATION 3.6.2 Repeatability Test (Cont.) σ Figure 3-6. Sample Calculation of Standard Deviation ( ) for FD3 Scale. Reading Weight (kg) Weight - Mean (Weight – Mean) 3000.5 0.16 3000.0 -0.1 0.01 3000.5 0.16 3000.0 -0.1 0.01 3000.5... -
Page 27: Linearity Test
CHAPTER 3 SCALE TESTING AND CALIBRATION 3.6.3 Off-Center Load Test (Cont.) 1. Zero the scale. 2. Place a test weight equal to 1/2 the scale capacity in the center of the weighing Pan and record the reading. 3. Move the test weight to the mid-point between the center and the left edge of the weighing Pan and record the reading. -
Page 28: Specifications
CHAPTER 3 SCALE TESTING AND CALIBRATION 3.7 SPECIFICATIONS TABLE 3-4. SPECIFICATIONS. Model FD15 Capacity x Readability 15 kg x 0.002 kg 3 kg x 0.0005 kg 6 kg x 0.001 kg (Max x d non-approved) 15000 g x 2 g 3000 g x 0.5 g 6000 g x 1 g 30 lb x 0.005 lb... -
Page 29: Calibration
N N N N N OTE: Before calibrating the scale, make sure it is not set for Legal For Trade operation. Calibration Types – The FD Series’ calibration can be adjusted in two ways, Span and Linearity. Span calibration uses two calibration points to adjust the sensitivity of the scale. Linearity calibration uses three calibration points to correct for non-linear weighing results. -
Page 30: Linearity Calibration
3.9 MENU 3.9.1 Menu Structure The FD Series menu structure consists of three levels: Main, Sub-menu, and Menu item. The Main menu contains the Sub-menus and each Sub-menu contains several Menu items. Each Menu item contains two or more settings. -
Page 31: Chapter 4 Repair Procedures
CHAPTER 4 REPAIR PROCEDURES REPAIR PROCEDURES This section describes how to change individual components of the FD Series Scales. When doing this, please refer to the exploded view drawings and parts lists in Section 5. Important: After replacing components, an operational test of the scale must always be carried out, (see Section 3.6). -
Page 32: Replacing The Membrane Switch
CHAPTER 4 REPAIR PROCEDURES REPLACING THE MEMBRANE SWITCH The membrane switch is affixed to the Top Housing of the scale. To replace the Membrane Switch, the scale must be disassembled to gain access to the switch connections. 1. Refer to Section 4.1 and remove Top Housing. CAUTION Use care in the next step as the Membrane Switch wiring is attached to the PC board. -
Page 33: Main Pc Board/Lcd Replacement
CHAPTER 4 REPAIR PROCEDURES MAIN PC BOARD / LCD REPLACEMENT The Main PC Board is located inside the scale towards the front. To replace the Main PC Board, it is necessary to disassemble the scale. The LCD may also be replaced as a separate item if cracked or partial displays are shown. -
Page 34: Lcd Replacement
CHAPTER 4 REPAIR PROCEDURES 4.3.1 Main PC Board Replacement (Cont.) 11. Set the capacity, see Appendix A.3. 12. Calibrate the scale according to the Instructions in Appendix A 13. Turn the scale off then on. It will go through all the self-testing. 14. -
Page 35: Replacing The Load Cell Assembly (With Frame)
CHAPTER 4 REPAIR PROCEDURES REPLACING THE LOAD CELL ASSEMBLY (WITH FRAME) The Load Cell Assembly is centrally located inside the scale. The Load Cell is factory assembled and the overload protection stops are pre-adjusted. There are no adjustments to be made on this assembly after installation. -
Page 36: Replacing The Load Cell Component
CHAPTER 4 REPAIR PROCEDURES REPLACING THE LOAD CELL COMPONENT This procedure is used when it is desired to keep the existing Load Cell Frame and just replace the Load cell. The Load Cell Assembly is centrally located inside the scale. When the new Load Cell is mounted to the existing Frame, the Overload Protection Stops must be adjusted. -
Page 37: Replacing The Battery
CHAPTER 4 REPAIR PROCEDURES 4.5.1 Overload Protection Stop Adjustment (Cont.) 3. Repeat this procedure for all of the Overload Protection Stops using the appropriate feeler gauges. 4. When the initial gap setting have been made, recheck all gap settings and adjust as required. 5. - Page 38 CHAPTER 4 REPAIR PROCEDURES REPLACING THE BATTERY (Cont.) 6. Place the Battery Holder in place over the Battery and secure with the two screws previously removed. 7. Attach the two battery wires with clips to the Battery. Make sure the Red wire is attached to the positive terminal on the Battery and the Black wire is attached to the negative terminal on the Battery.
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Page 39: Chapter 5 Parts Lists
CHAPTER 5 PARTS LISTS 5. PARTS LISTS This section of the manual contains exploded views, and parts lists for the FD Series Scales. The exploded view drawings identifies the replaceable parts. NOTE: In all cases where a part is replaced, the scale must be thoroughly checked after the replacement is made. -
Page 40: Fd Series Scales Exploded View
CHAPTER 5 PARTS LISTS 5.1 FD Series Scales Exploded View Figure 5-1. Exploded View of FD Series Scales. -
Page 41: Fd Series Scales Parts List
CHAPTER 5 PARTS LISTS TABLE 5-1. FD SERIES SCALES PARTS LIST. ITEM NO. PART NO. DESCRIPTION QUANTITY 71172937 Seal, Adapter & Foot Switch Socket, FD 80500435 AC Adapter, US 120 Volts, 60 Hz 80500521 AC Adapter, US 220 Volts, 60 Hz... - Page 42 CHAPTER 5 PARTS LISTS...
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Page 43: Appendix A Service Menu
APPENDIX A SERVICE MENU A. INTRODUCTION This section describes the Service menu and sub-menus, which allow authorized service personnel to perform factory settings and calibration as well as setting the Geo code. There is also a ramp display used to indicate the condition of the load cell. Please refer to the Service Menu diagram RAMP E.PAND Display... -
Page 44: Geographical Adjustment Factor
APPENDIX A SERVICE MENU A.4 GEOGRAPHICAL ADJUSTMENT FACTOR This menu item is used to allow entry of values from 0 to 31 and is used to compensate for slight variations in gravity at different geographical locations around the world. (Complete Geographical Adjustment (Complete Geographical Adjustment (Complete Geographical Adjustment (Complete Geographical Adjustment... -
Page 45: Ramp
APPENDIX A SERVICE MENU A.6 RAMP Ramp is used to primarily determine if the Load Cell is damaged from causes including abuse, heavy weights dropped on the Pan, or dropping the scale. The ramp function displays the duty cycle of the A/D converter output to within one tenth of a percent. -
Page 46: Geographical Adjustment Values
APPENDIX A SERVICE MENU TABLE A-1. GEOGRAPHICAL ADJUSTMENT VALUES Elevation above sea level in meters Geographical latitude 1300 1625 1950 2275 2600 2925 3250 away from the equator, 1300 1625 1950 2275 2600 2925 3250 3575 (North or South) in Elevation above sea level in feet degrees and minutes. - Page 48 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com *80250906* PN 80250906 SERVICE MANUAL - FD SERIES SCALES...
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