OHAUS Valor 7000 Service Manual
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OHAUS Valor 7000 Service Manual

Ohaus valor 7000 scales service manual
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SERVICE MANUAL
7000
VALOR
™
Ohaus Corporation, 7 Campus Drive, Suite 310, Parsippany, NJ 07054 (973) 377-9000

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Summary of Contents for OHAUS Valor 7000

  • Page 1 SERVICE MANUAL 7000 VALOR ™ Ohaus Corporation, 7 Campus Drive, Suite 310, Parsippany, NJ 07054 (973) 377-9000...
  • Page 2 VALOR ™ 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 3: Table Of Contents

    CHAPTER 1 GETTING STARTED Introduction ......................1-1 Service Facilities ......................1-1 Tools and Test Equipment Required ................1-1 Specifications ......................1-2 Scale Operation Valor 7000 ..................1-3 1.5.1 Overview of the Controls ...................1-3 1.5.2 Power On/Off ....................1-4 1.5.3 Menu Setup ......................1-5 1.5.4 Menu Navigation ....................1-5 Legal For Trade .......................1-6...
  • Page 4 TABLE OF CONTENTS CHAPTER 5 DRAWINGS AND PARTS LISTS Valor 7000 Scale: Housing & Internal Parts .............5-2 Appendix A STANDARD CALIBRATION Calibration ....................... A-1 Setup and Calibration ....................A-2 Appendix B SERVICE CALIBRATION Service Menu Structure ................... B-1 Entering the Service Menu ..................B-1 Capacity Menu ......................

  • Page 5: Chapter 1 Getting Started

    INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus Valor 7000 Series scales. Familiarity  with  the  scale’s  Instruction   Manual is assumed. The contents of this manual are contained in five chapters: Chapter 1 Getting Started –...

  • Page 6: Specifications

    CHAPTER 1 GETTING STARTED SPECIFICATIONS Complete specifications for the Ohaus Valor 7000 scales are listed in Table 1-1. When a scale has been serviced, it must meet the specifications listed in the table. Before servicing the scale, determine what specifications are not met.

  • Page 7: Scale Operation Valor 7000

    CHAPTER 1 GETTING STARTED SCALE OPERATION – VALOR 7000 This section contains information on the basic operation of the Valor 7000 scale. 1.5.1 OVERVIEW OF THE CONTROLS Figure 1-1. Valor 7000 Front Display with controls. TABLE 1-2. Control functions Valor 7000...

  • Page 8: Power On/Off

    When [lo.bat] is displayed, the scale will shut off. Charging the scale must be performed in a dry environment. CAUTION: Battery is to be replaced only by an authorized Ohaus service dealer. Risk of explosion can occur if the rechargeable battery is replaced with the wrong type or if it is not properly connected.

  • Page 9: Menu Setup

    CHAPTER 1 GETTING STARTED 1.5.3 Menu Setup Programmable features of the Valor 7000 scales are contained in menus which are accessed  through  the  Display  Panel’s  control  switches.    See  the  Instruction Manual for a full description of the menus and how to access them.

  • Page 10: Legal For Trade

    The local weights and measures official or authorized service agent must apply a security seal to prevent tampering with the settings. Refer to the illustration below for sealing methods. Paper Seal Wire Seal Lock Switch Unlocked Locked with Paper Seal Locked with Wire Seal Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...
  • Page 11 CHAPTER 1 GETTING STARTED Figure 1-3. Sealing Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 12: Chapter 2 Troubleshooting

    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. Valor™ 7000 Series Service Manual...

  • Page 13: Checking Load Cells For Trouble

    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 Valor 7000.) TABLE 2-2. COLOR CODE FOR LOAD CELL WIRING*...
  • Page 14 100% Load 0.492666667 0.992666667 1.49266667 V71P1502T / 1.5kg 0.2956 0.8956 1.4956 V71P3T / 3kg 0.1478 0.7478 1.3478 V71P6T / 6kg 0.0739 0.8239 1.5739 V71P15T / 15kg 0.03695 0.78695 1.53695 V71P30T / 30 kg Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 15: Testing The Printed Circuit Board (Pcb)

    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 3.1 Volt excitation voltage applied. Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...
  • Page 16 PCB is functional. If the scale readings vary, or do not agree with readings in Table 2-3, the Main PC Board is defective and should be replaced. (See Chapter 3.) Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 17: Diagnostic Guide

    Increase reference weight Battery fails to charge Have battery replaced by Ohaus Battery is defective fully authorized service dealer. Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...

  • Page 18: Chapter 3 Maintenance Procedures

    5. Make a visual inspection for faulty connectors, wiring, and loose hardware. SERVICE STRATEGY All parts of the Valor 7000 are designed to be replaced rather than repaired. This includes the Main Printed Circuit Board (PCB) and Switches PCB, the Load Cell, and the cables. For an illustrated list of replaceable parts, see Chapter 5.

  • Page 19: Separating The Top And Bottom Housings

    CHAPTER 3 MAINTENANCE PROCEDURES 3.3.1 Separating the Top and Bottom Housings Common hand tools are sufficient to disassemble the Valor 7000 scales. Turn the scale off and unplug the power cord before you begin. 1. Lift off the Weighing Pan.

  • Page 20: Main Printed Circuit Board

    6. Re-connect the Cable  connecting  the  Main  PCB  to  the  scale’s  power  system.     (See Figure 3-2.) 7. Insert and tighten the screws that secure the PCB to the bottom housing. Figure 3-3. Main Printed Circuit Board. Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 21: Removing/Replacing The Load Cell

    (see table 3-2). Install the load cell assembly to the bottom housing. Insert the bolts and their washers, and tighten the bolts. (See Table 3-1 for torque settings.) 5. Connect the Load Cell cables to the PCB. (See Figure 3-2.) Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...

  • Page 22: Setting The Overload Stops

    Note: Be careful not to overload the Load Cell, which would damage it. 2. Repeat this for all four corners. 3. Test the scale to see if full capacity can be achieved. Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...
  • Page 23 CHAPTER 3 MAINTENANCE PROCEDURES TABLE 3-2. VALOR 7000 OVERLOAD STOP GAP SETTINGS Model Max. Capacity Overload Stop Gap V7000 Scale Load Cell A/B mm C/D mm V71P1501T 1.5kg V71P3T V71P6T 10kg V71P15T 15kg 20kg V71P30T 30kg 40kg Load Cell Figure 3-6. Gap position of corners A, B, C, D. (A & B represent the front of the scale.) Ohaus Corporation www.ohaus.com...

  • Page 24: Removing/Replacing The Rechargeable Battery

    CHAPTER 3 MAINTENANCE PROCEDURES Removing/Replacing the Rechargeable Battery The Valor 7000 has a rechargeable battery. If it fails to recharge, replace it as follows: 1. Lift  the  battery’s  front  end  enough  to   access the quick-connect tabs holding the wire leads.

  • Page 25: Chapter 4 Testing

    4.1.1 TEST MASSES REQUIRED The masses required to test the Ohaus Valor 7000 scales must meet the requirements of ASTM Class 4 or OIML F2 Tolerance. The mass values are listed in Table 4-1. TABLE 4-1. TEST MASS VALUES...

  • Page 26: Performance Tests

    CHAPTER 4 TESTING Performance Tests Accurate performance of the Valor 7000 scale is determined by a series of four performance tests. The displayed readings are compared with the tolerances listed for each test in Table 1-2. Tolerance values are expressed in counts. A one-count difference is shown in the last digit on the scale display.

  • Page 27: Repeatability Test

    3. Remove the mass from the platform. 4. Repeat this test starting at Step 1 until you record a total of ten readings Fill in the worksheet (Table 4-2) with the ten (10) readings. Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 28: Repeatability Worksheet

    Calculate the Standard Deviation by applying the square root of the result from step 8. =___________ Standard Deviation Note: If the balance does not meet specifications, move it to a suitable location, ensure that it is level, and try again. Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...

  • Page 29: Linearity Test

    3. Move the mass halfway (between the center and the edge) to the front of the Pan. Note any differences in the displayed weight reading. 4. Repeat the test for the back, left, and right position of the Pan. Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 30: Adjusting Off Center Load

    Side view of Load Cell Weighing  Pan’s  center, with points A – D indicated Figure 4-1. Scale drawing of Valor 7000 Load Cell and Weighing Pan. 1. Place the test weight in the center of the Weighing Pan. 2. Tare the balance.
  • Page 31 CHAPTER 5 PARTS LISTS & DIAGRAMS This section of the manual contains exploded views of the Valor 7000 scale. The exploded view drawings are designed to identify the parts which can be serviced on the scale in the field. NOTE: In all cases where a part is replaced, the scale must be thoroughly checked after the replacement is made.
  • Page 32 CHAPTER 5 PARTS LISTS & DIAGRAMS Valor 7000 SCALES: PARTS Figure 5-1. Valor 7000 Scales: Parts. Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...
  • Page 33 72200228 Line Cord, AU 72200231 Line Cord, GB 72200230 Line Cord, JP 30031898 Manual,CD, EN ES FR DE IT, V71 Note: For parts numbers, see your local Ohaus distributor, or visit www.ohaus.com. Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 34: Appendix A Standard Calibration

    6. Or adjust the GEO setting according to your location (see instruction manual). Table A-1. Suggested Span Calibration Mass (sold separately) Mass Mass 1500g 1.5kg / 3lb 15000g 15kg / 30lb 3000g 3kg / 6lb 30000g 30kg / 60lb 6000g 6kg / 15lb Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 35: Setup And Calibration

    No to select an alternate weight. [--C--] will be displayed while the reading is stored. done 5. The display will show [done] if the calibration was successful. The scale returns to the previous application mode and is ready for use. Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...

  • Page 36: Appendix B Service Calibration

    Grad Span Ramp Expand B.2 Entering the Service Menu Turn the scale off. Press the On/Zero then hold the Function and M+ keys S.E.r.V.C.e simultaneously for 6 seconds until is displayed. S.E.r.V.C.e Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 37: Capacity Menu

    If span calibration was successful, the actual weight reading appears for three seconds, followed by the Service Linearity Calibration menu item. (The example shows a 3 kg span weight on the pan.) Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...

  • Page 38: Service Linearity Calibration

    Then try to calibrate again. If it continues to fail, there may be an internal problem. To resolve internal problems, follow procedures in Chapter 3. Valor™ 7000 Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 39: Ramp Menu

    Note: Expand is required for various performance tests. B.9 End Menu e.N.D e.N.D When appears, press YES to return to exit the service menu, or No to advance to the CAP menu. Ohaus Corporation www.ohaus.com Valor™ 7000 Series Service Manual...

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