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Summary of Contents for OHAUS EB SERIES
- Page 1 EB SERIES SCALES SERVICE MANUAL Ohaus Corporation 7 Campus Drive, Suite 310, Parsippany, NJ 07054 (973) 377-9000...
- Page 3 EB SERIES SCALES 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
Diagnosis .........................2-1 Scale Setup and Examination ..................2-1 Preliminary Checks ....................2-1 Troubleshooting Tables ....................2-1 EB Series Scales Error Code Table .................2-5 Testing the AC Adapter ....................2-6 Testing the Membrane Switch ..................2-6 Testing the Load Cell Assembly ................2-7 2.7.1 Resistance Test ....................2-7 2.7.2 Excitation and Output Voltage Test ..............2-7... - Page 6 Load Cell Output Reading ..................2-8 Load Cell Screw Torque Settings ............... 3-11 Load Cell Overload Protection Stop Gap Settings..........3-13 Repeatability Worksheet ..................4-2 Calibration Points....................4-6 EB Series Scales: Housing and Parts ..............5-3 Scale Resolution Settings ................... A-2 LIST OF ILLUSTRATIONS FIGURE NO. TITLE Page No.
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Page 7: Figure No
TABLE OF CONTENTS FIGURE NO. TITLE Page No. 3-17 Overload Stop Locations..................3-12 3-18 Battery Connections ..................3-14 Segment Display ....................4-1 Off-Center Load Test Weight Locations ...............4-2 EB Series Scales: Housing and Parts ..............5-2 EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... - Page 8 TABLE OF CONTENTS Ohaus Corporation www.ohaus.com EB Series Scales Service Manual...
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Page 9: Chapter 1 Getting Started
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: Standard Tools And Test Equipment
NOTE: Adapters required for servicing are location dependent. 1.3 CALIBRATION MASSES REQUIRED The masses required to test the EB Series Scales must meet the requirements of ASTM Class 4 or OIML Class F2. The mass values are listed in Table 1-1. -
Page 11: Specifications
440 x 360 x 160 mm / 17.3 x 14.2 x 6.3 in (W x D x H) Net Weight 4.2 kg / 9.3 lb Shipping Weight 5.3 kg / 11.7 lb Other Features Auto-Zero Tracking, Filtering Level EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 12: Scale Settings
FiL 1 Filtering - Sets the level at which the Stable indication turns on; the higher the setting, the faster the stabilization time. The following settings are available: 0, 1, 2, 3 (levels). Ohaus Corporation www.ohaus.com EB Series Scales Service Manual... -
Page 13: Chapter 2 Diagnosis
If the scale fails to turn on with a new Membrane Switch, test the Main PC Board (Section 2.8). If defective, replace the Main PCB (Section 3.3.1). After repair, proceed with Performance Tests in Chapter 4. EB Series Scales Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 14: Scale Will Not Turn On Using Battery Power
If the scale fails to turn on with a new Membrane Switch, test the Main PC Board (Section 2.8). If defective, replace the Main PCB (Section 3.3.1). After repair, proceed with Performance Tests in Chapter 4. Ohaus Corporation www.ohaus.com EB Series Scales Series Service Manual... -
Page 15: Scale Does Not Respond To Front Panel Controls
Replace Display PC Board or LCD. signs of damage such as See Repair Procedures 3.3.2 and cracked, dim or partial 3.3.3. characters, the LCD should After repair, proceed with Performance be replaced. Tests in Chapter 4. EB Series Scales Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 16: Balance Reading Incorrect Or Unstable
After repair, proceed with Performance Tests in Chapter 4. Main PC Board defective Test the Main PC Board (Section 2.8). If defective, replace it (Section 3.3). After repair, proceed with Performance Tests in Chapter 4. Ohaus Corporation www.ohaus.com EB Series Scales Series Service Manual... -
Page 17: Eb Series Scales Error Code Table
CHAPTER 2 DIAGNOSIS EB SERIES SCALES ERROR CODE TABLE The EB 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. EB SERIES SCALES ERROR CODES... -
Page 18: Testing The Ac Adapter
1 to 2 UNITS 1 to 3 ZERO 1 to 4 TARE 1 to 5 CHECK 1 to 6 Figure 2-1. Membrane Switch Connector. COUNT 1 to 7 1 to 8 Ohaus Corporation www.ohaus.com EB Series Scales Series Service Manual... -
Page 19: Testing The Load Cell Assembly
4. Refer to Figure 2-2 and measure the voltages on points 3 and 4, +SIG and –SIG points. These measurements represent the output of the Load Cell. Repeat measurements at 50% and full scale capacities. See Table 2-10 for typical readings. EB Series Scales Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 20: Load Cell Output Reading
Note: Wiring connections are different in Version 1 and Version 2. (V2 introduced in Fall 2009.) Main PCB: VERSION 2 AC ADAPTER TO POWER CONNECTOR SWITCH Figure 2-3. EB Interconnections: Version 2. Ohaus Corporation www.ohaus.com EB Series Scales Series Service Manual... -
Page 21: Testing The Main Pc Board
Load Cell allowing the scale to be separated from the Load Cell for the purposes of troubleshooting and calibration. The Load Cell used in the scale is rated at 2mV/V output with a 5 Volt excitation voltage applied. EB Series Scales Series Service Manual Ohaus Corporation www.ohaus.com... -
Page 22: General Load Test
4. Remove power from the scale and proceed with Section 3.3 and replace the Main PC Board. 5. After Main PC Board replacement and assembly of the scale, proceed with Performance Tests in Chapter 4. Ohaus Corporation www.ohaus.com 2-10 EB Series Scales Series Service Manual... -
Page 23: Testing The Battery
Adapter all of the time, the battery receives a small charge when the battery voltage is low, service life can be many years. The EB Series Scales can be operated for up to 80 hours per charge. Battery life can be maximized by frequent charging. - Page 24 CHAPTER 2 DIAGNOSIS Ohaus Corporation www.ohaus.com 2-12 EB Series Scales Series Service Manual...
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Page 25: Chapter 3 Repair Procedures
CHAPTER 3 REPAIR PROCEDURES REPAIR PROCEDURES This section describes how to change individual components of the EB Series Scales. When doing this, please refer to the drawings and parts lists in Section 5. Important: After replacing components, a Performance Test must always be carried out. -
Page 26: Replacing The Membrane Switch
Figure 3-2. Removing the Top Housing. 3. Carefully disconnect the ribbon cable from connector on the Display PC board. See Figure 3-3. Figure 3-3. Ribbon Cable from Main PCB to Display PCB. Ohaus Corporation www.ohaus.com EB Series Scales Service Manual... -
Page 27: Disconnecting The Membrane Switch Cable
10. Reassemble the scale by replacing the five screws at the bottom of the scale which secure the Top housing. 11. Replace the Pan Support and Pan on top of the scale. EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 28: Battery Terminal Connector
Figure 3-6. Main PC Board Screws and Washers. 5. Carefully lift the Main PCB up and out of the slots in the supporting posts. You may have to rock the Board from left to right to lift it out. Ohaus Corporation www.ohaus.com EB Series Scales Service Manual... -
Page 29: Main Pcb, Version 1
Board. Make sure that the color coded wiring is installed in the correct locations. 10. Connect the Display Cable to the Main PC Board connector. (See Figure 3-9.) Figure 3-9. Display Cable installed on Main PCB. EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... - Page 30 17. Reassemble the scale and replace the Platform Support and Platform on top of the scale. 18. Turn the scale on. It will go through all the self-testing and operate normally. 19. After repair, initiate Performance Tests, see Chapter 4. Ohaus Corporation www.ohaus.com EB Series Scales Service Manual...
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Page 31: Disconnecting Membrane Switch Cable From Display Pcb
Figure 3-11. Disconnecting Membrane Switch Cable from Display PCB. 4. Remove six screws that hold the Display PCB to the Top Housing. See Figure 3-12. Figure 3-12. Screws connecting Display PCB to Bottom Housing. EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 32: Lcd Replacement
3. Solder all connections, check the Display PC Board and make sure that solder has not spilled over to other connections. Remove any protective film from the LCD and replace the LCD. 4. Continue with steps 6 through 8 of Section 3.3.2. Ohaus Corporation www.ohaus.com EB Series Scales Service Manual... -
Page 33: Replacing The Load Cell Assembly (With Frame)
4. Remove the four screws holding the Load Cell Figure 3-13. Feet on Bottom of Scale. Assembly to the bottom housing. See Figure 3-14 for screw locations. Figure 3-14. Load Cell Retaining Screw Locations. EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... - Page 34 15. Turn the scale off then on. It will go through all the self-testing. When self-testing is completed, the scale should work normally. 16. After repair, initiate Performance Tests. (See Chapter 4.) Ohaus Corporation www.ohaus.com 3-10 EB Series Scales Service Manual...
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Page 35: Replacing The Load Cell Component
6 kg 10 N.m / 88 in. lb 15 kg 10 N.m / 88 in. lb 30 kg 6. Align Top and Bottom Frames and tighten screws as indicated. Recheck alignment. EB Series Scales Service Manual 3-11 Ohaus Corporation www.ohaus.com... -
Page 36: Overload Protection Stop Adjustment
Do all four stops and recheck until settings are correct. Adjusting Screw Adjusting Screw Locking Nut Locking Nut Figure 3-17. Overload Stop Locations. Ohaus Corporation www.ohaus.com 3-12 EB Series Scales Service Manual... -
Page 37: Load Cell Overload Protection Stop Gap Settings
24.5kg 3 kg 0.6mm 292.kg 6 kg 0.8mm 22.5kg 15 kg 1.0mm 45.5kg 30 kg 1.6mm 5. Reassemble the scale. 6. Calibrate the scale using Appendix B instructions. Check all operations. EB Series Scales Service Manual 3-13 Ohaus Corporation www.ohaus.com... -
Page 38: Replacing The Battery
Allow the battery to charge for at least 12 hours with the scale off. A new battery requires a long charge period to obtain maximum service when operating the scale for the first time. Ohaus Corporation www.ohaus.com 3-14 EB Series Scales Service Manual... -
Page 39: Chapter 4 Final Testing & Calibration
CHAPTER 4 FINAL TESTING & CALIBRATION PERFORMANCE TESTS Accurate performance of the EB 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. Each scale tested must meet the requirements specified in each test as well as the specifications listed in Table 4-1. -
Page 40: Repeatability Worksheet
7. Calculate the Delta x Delta for each reading and record in worksheet. 8. Add the ten Delta x Delta values and divide by 9 Calculate the Standard Deviation by applying the square root of the result from step 8. Standard Deviation =___________ Ohaus Corporation www.ohaus.com EB Series Scales Service Manual... -
Page 41: Off-Center Load Test
10. Maximum reading should be ≤ OCL specifications for the scale. Reading toward Rear ____________ Reading toward Left ____________ Reading toward Right ____________ Reading toward Front ____________ Maximum Reading ____________ Figure 4-2. Off-Center Load Test Weight Locations. EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... -
Page 42: Linearity Test
ZERO to rezero the display, and take the reading again. 13. Calculate the weight differences between the reading as shown in the recorded readings. 14. The Maximum difference should be less than or equal to the Linearity specification for the scale. Ohaus Corporation www.ohaus.com EB Series Scales Service Manual... - Page 43 Reading 1 – [(Reading 1 + Reading 2) / 2] = ________________ Reading 2 – [(Reading 2 + Reading 3) / 2] = ________________ Reading 3 – [(Reading 3 + Reading 4) / 2] = ________________ Maximum Difference ________________ EB Series Scales Service Manual Ohaus Corporation www.ohaus.com...
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Page 44: Calibration
CHAPTER 4 FINAL TESTING & CALIBRATION 4.2. CALIBRATION Calibration – The EB Series’ calibration can be calibrated using full scale capacity as the best method for the most accurate results, this is referred to as span calibration. Calibration Weights – Before beginning calibration, make sure that the required calibration weights are available. - Page 45 CHAPTER 5 PARTS LISTS & DIAGRAMS PARTS LISTS This section of the manual contains exploded views for the EB Series scales. The exploded view drawings are designed to identify the parts which can be serviced on the scale in the field.
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Page 46: Drawings And Parts Lists
CHAPTER 5 PARTS LISTS & DIAGRAMS Drawings and Parts Lists EB Series: Parts Figure 5-1. EB Series Scales: Housing and Parts. Ohaus Corporation www.ohaus.com EB Series Scales Service Manual... -
Page 47: Eb Series Scales: Housing And Parts
Bottom Load Cell Frame Battery Wire Harness Rechargeable Battery Main PCB Level Bubble Bottom Housing Hardware Kit Foot Power Switch Assembly Adapter Note: see specific parts lists through your local Ohaus office, or Ohaus.com. EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... - Page 48 CHAPTER 5 PARTS LISTS & DIAGRAMS Ohaus Corporation www.ohaus.com EB Series Scales Service Manual...
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Page 49: Appendix A Service Modes
A.2 SERVICE CALIBRATION Service calibration utilizes a three point calibration technique where calibration weights of 1/3, 2/3 and full capacity are used. If 0.0 appears after entering Service Menu, proceed as follows: EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... - Page 50 After accepting the weight, the scale will restart the scale check process. Remove the weight while the self-check is occurring. 5. The display will show 0.0. Turn off the scale. 6. Refer to Figure A-1 and return the jumper to the normal position. Ohaus Corporation www.ohaus.com EB Series Scales Service Manual...
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Page 51: Scale Resolution Settings
4. When the correct value is shown, press the TARE button to accept. The display will now show 0.0. 5. After the configuration of the scale has been done, it must be calibrated, perform procedure in paragraph A.2. EB Series Scales Service Manual Ohaus Corporation www.ohaus.com... - Page 53 *80251392* P/N 80251392 D SERVICE MANUAL: EB SERIES SCALES...
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