2000 scales - Ohaus Corporation
Contents
1. test mass should be approximately 1 2 of the capacity of the instrument Wear gloves when handling the mass Before starting a repeatability test set up the instrument as follows Set Up Enter the menu and adjust and record the following settings A Set the Filter level to medium or the center of its range B Set the AZT Auto Zero Tracking to 5d or its lowest setting Do not turn it off C Set the instrument to display the same units as the performance specifications Record Settings Filter Level Setting Auto Zero Tracking Setting Displayed Units Mass Used TEST PROCEDURE 1 Zero the instrument 2 Using a test mass approximately half the capacity of the instrument place the mass on the center of platform Record the reading on the worksheet provided Remove the mass from the platform 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 2000 Series Service Manual 4 3 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 4 4 2 Repeatability Test TABLE 4 2 REPEATABILITY WORKSHEET n Reading Delta Reading Mean Delta x Delta 4 2 3 4 5 6 7 8 9 10 n number of Reading Mean Sum of readings 10 Delta Reading Mean Standard Deviation Square Root of sum of Delta x Delta 9 5 Addthe ten reading2. Entering the Service Menu nee aeg B 1 B 2 gt Ramp Men tn at a B 1 Bi Capacity MENU EET idos B 1 BA Service Bon Oe TEE B 2 B 5 Service Span ENEE pa nt dp tt na B 3 B 5 Service Linearity CGalbratton nenea nenea nnne B 4 LIST OF TABLES TABLE NO TITLE Page No 1 1 Specifications o cote a sabia enee euer 1 2 1 2 Functions of Display Controls a 1 3 1 3 Battery Charge TE 1 4 1 4 Valor 2000 Menu e EDO Re a i d d 1 5 2 1 Load Cell Resistance Readings in 2 2 2 2 Color Code for Load Cell Wiring ANNE 2 2 2 3 Load Cell Output Readings in mV with Exctaton 2 3 2 4 Diagnostic QUIE id 2 4 4 1 Test Mass Values contri at hl 4 1 4 2 Repeatability Worksheet mete e eate ete aot tens 4 4 4 3 Linearity Test Masses bd atei ae ct i e n ae dt net a 4 5 5 1 Valor 2000 Scales Housing amp Internal 5 3 LIST OF ILLUSTRATIONS FIGURE NO TITLE 1 1 Valor 2000 Front Display with controls 1 4 1 2 Waterproof seal on power input Jack 1 5 1 3 CET Loc aa UD a 1 7 1 4 LIB TE ROCK Scala E 1 7 2 1 Valor 2000 PB ung 2 3 3 1 Screws and washers securing Pan Support to Top Housing 3 2 3 2 Gall BORO E 3 2 3 3 Bolts and washers securing Loa
3. OHAUS SERVICE MANUAL Valor 2000 SCALES Ohaus Corporation 7 Campus Drive Suite 310 Parsippany NJ 07054 973 377 9000 OHAUS SERVICE MANUAL Valor 2000 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 Material in this manual is subject to change Copyright 2011 Ohaus Corporation all rights reserved TM Registered trademark of Ohaus Corporation TABLE OF CONTENTS Page No CHAPTER 1 GETTING STARTED date HIO UCH ns see ee eer 1 1 132 ISOIVICO FACIES cad 1 1 1 3 Tools and Test Equipment Required nana 1 1 A EE TE 1 3 1 5 Scale Operation EE 1 4 1 5 1 Overview of the EDF cases ree gege 1 4 14552 POWER EE 1 5 1 5 3 POWEr Offene ee ee 1 5 1 5 4 Menu Setup cu cti ee 1 6 1 5 5 Menu IN AMI Ee 1 6 1 6 Legal cedri 1 7 CHAPTER 2 TROUBLESHOOTING 2 1 Troubleshooting EE 2 1 2 2 Diagnostic Guide nes rer a eu 2 1 2 2 1 Manos Ita ida 2 1 2 2 2 Checking Load Cells for Trouble 2 2 2 2 3 Testing the Printed Circuit Board DCH 2 4 2 2 4 O lo eS A RT 2 6 CHAPTER 3 MAINTENANCE PROCEDURES 3 1 Preventive Maintenance kee 3 1 3 1 1 Preventive Maintenance Checklist AAA 3 1 Ke TRE 3 1 33 Openng ne Scale e oct a ada 3 1 3 2 1 Separating the Top and Bottom Housimg
4. 1 1 Span Calibration Span calibration uses two calibration points The first is established with no load on the scale The second is established at a load from the Span Calibration Point values in Table 1 1 The span calibration point is user selectable To enter the Calibration menu press and hold UNIT Menu until CAL appears Press Yes SPAN appears Press YES O flashes The kg LED is lit to indicate the calibration unit With no weight on the pan press Yes to establish the zero point The zero calibration value must be stable and within 20 of the stored factory zero calibration value Note Outlined characters represent a flashing display DN Note If the pan is not empty 20 of the factory calibration zero value CLEAr PAN flashes for a timeout period of five seconds If the load is not stable within ten seconds or the value is not within the Vii 20 limit CAL E appears for three seconds and the scale returns to the A weighing mode The previous user calibration data is used and the current weight is displayed appears while the zero point is established E The span calibration point flashes 3 Place the specified calibration weight on the pan and press Yes e To choose a different span point press No until the desired value appears See the User Calibration Point Table for available span points The alternate span points are displayed in decreasing order 9 Place the specified calibration we
5. 5 Repair or replace the defective section of the balance 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 Valor 2000 Series Service Manual 2 1 Ohaus Corporation www ohaus com CHAPTER 2 DIAGNOSTIC GUIDE 2 2 2 Checking Load Cells for Trouble 1 A Perform a Resistance Test to determine if the Load Cell is severely damaged or a short circuit to the frame has occurred See Chapter 4 for details Note The Load Cell must be completely disconnected from the Printed Circuit Board and at no load when the resistance readings are taken Using an ohm meter measure and record resistance between each pair of wires from the Load Cell as specified in Table 2 1 Compare the measured readings with the specified values in Table 2 1 If the resistance readings are in the range specified skip to the next section If they are outside the expected range open circuit or short circuit across any two wires the Load Cell is defective replace it See Chapter 3 TABLE 2 1 LOAD CELL RESISTANCE READINGS in Ohms Model Ex to Ex S to S Ex to S Ex to S Ex to S4 Ex to S 289 10 All models 404 10 350 4 289 10 289 10 289 10 Perform an Output Voltage Test Measure the no load 50 load an
6. mass throughout the procedure 2 OL e S dq 9 Place the test mass on the Scale record the weight and remove Place Load 1 on the Scale and press ON O T Place the test mass on the Scale record the weight and remove Place Load 2 on the Scale and press ON O T Place the test mass on the Scale record the weight and remove Place Load 3 on the Scale and press ON O T Place the test mass on the Scale and record the weight The difference in the weights of the test mass should be within 1 d If not calibrate see Appendix A 1 and repeat the test If the Scale remains out of tolerance the Load Cell may need to be replaced 4 4 4 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 2 3 Place half of the scale s capacity in the center of the Pan Note the reading Move the mass halfway between the center and the edge to the front of the Pan Note any differences in the displayed weight reading Repeat the test for the back left and right position of the Pan Maximum allowable change in displayed weight readings for each of the four positions can be found in Tables 1 2 Specifications page 1 3 If this maximum is exceeded follow procedures in Section 4 4 5 Adjusting Off Center Load Valor 2000 Series Service Manual 4 5 Ohaus Corporation www ohaus com CHAPTER 4 TESTI
7. the scale on its side After the LFT Lock Switch has been removed the scale must be inspected in accordance with local weights and measures regulations before it can be used in LFT mode again Local authorities may apply a seal as shown in Figure 1 4 Figure 1 4 LFT Lock Seal Valor 2000 Series Service Manual 1 7 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED Ohaus Corporation www ohaus com 1 8 Valor 2000 Series Service Manual CHAPTER 2 DIAGNOSTIC GUIDE 2 1 TROUBLESHOOTING This section of the manual contains troubleshooting information Information is contained to isolate specific problems using Table 2 1 Diagnostic Guide Follow all directions step by step Make certain that the work area is clean Handle balance components with care Use appropriate Electro Static Device 2 2 DIAGNOSTIC GUIDE Table 2 1 is a Diagnostic Guide designed to help locate the problem area quickly and easily The probable causes are listed with the most common cause first If the first remedy does not fix the problem proceed to the next remedy Before attempting to repair the balance read all chapters of this manual to be familiar with the balance components and operation 2 2 1 Diagnosis 1 Isolate and identify the symptom 2 Refer to Table 2 1 Diagnostic Guide and locate the symptom 3 Follow the suggested remedies in the order they appear 4 Perform the indicated checks or see the appropriate section of the manual
8. 1 Remove the four screws in its cover 2 Lift the cover as much as possible to access and remove the white tabs holding the two cable sets to the PCB 3 Remove the screw holding a metal stop tab that secures the PCB lift them out Slide the Power PCB up and out Slide in the replacement PCB Insert the two cable plugs Figure 3 5 Power PCB housing next to Position the Power PCB cover and the rechargeable battery install the screws no om P 3 8 Cable Set Replacement Note All the cables connecting the Main and Rear Display PCBs connecting the Main PCB to the Power PCB and the Power PCB to the Battery are sold together with their plugs as a single set Replace them singly or together as follows 1 Disconnect the cables from the connectors and remove the quick connect tabs 2 Note that the new cable set does NOT come with quick connect tabs insert the replacement wire in the new quick connect tabs acquired separately 3 Reconnect the wires using the original plastic tabs 3 9 Replacing the Battery Charge the battery only with the scale s charger Charging it under any other conditions may cause it to overheat emit hydrogen gas leak ignite or burst Operate the battery at normal temperature range as specified for the scale Do short the battery terminals under any conditions Do dispose of the battery in incinerators or crush or try to open it Dispose of the defective
9. IC GUIDE 2 2 2 Checking Load Cells for Trouble 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 See Table 2 3 for typical readings AC 8 Battery Connector Rear Display PCB Connector Not used 4 TOP VIEW OF PCB Figure 2 1 Valor 2000 PCB connections NOTE Table 2 3 indicates typical readings Actual values can vary but should remain linear throughout the range If readings are out of tolerance replace the Load cell See Section 3 6 TABLE 2 3 LOAD CELL OUTPUT READINGS in mV with 5V Excitation Model Capacity Zero Load 50 Load 10096 Load V21P3 3kg 0 8 2 0 Zero 3 8 Zero 6 8 V21P6 6kg 0 9 2 0 Zero 4 7 Zero 7 6 V21P15 15kg 0 4 2 0 Zero 4 1 Zero 7 8 Valor 2000 Series Service Manual 2 3 Ohaus Corporation www ohaus com CHAPTER 2 DIAGNOSTIC GUIDE 2 2 3 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 PCB Voltage Measurements No
10. NG 4 4 5 Adjusting Off Center Load If the Off Center Load OCL is excessive perform adjustment as follows Top view of Load Cell Side view of Load Cell Weighing Pan s center with points A D indicated Figure 4 2 Scale drawing of Valor 2000 Load Cell and Weighing Pan zeck Place the test weight in the center of the Weighing Pan Tare the balance Move the weight to point A and record the reading Move the weight to point B and record the reading Move the weight to point C and record the reading Move the weight to point D and record the reading If the reading at point A is negative file at points 1 and 4 AT AN ANGLE If the reading at point B is negative file at points 1 and 2 STRAIGHT ACROSS oN o oc o m If the reading at point C is negative file at points 2 and 3 AT AN ANGLE 10 If the reading at point D is negative file at points 3 and 4 STRAIGHT ACROSS AN Note It is not recommended that you try to adjust more than 5 counts if the beam has been filed already If the beam has not been filed previously you can adjust 10 counts Remember when filing you are weakening the beam File a little at a time Ohaus Corporation www ohaus com 4 6 Valor 2000 Series Service Manual CHAPTER 5 PARTS LISTS amp DIAGRAMS This section of the manual contains exploded views of the Valor 2000 scales The exploded view drawings are designed to identify the parts which can be serviced on the sc
11. Power PCB to the Main PCB Install the Load Cell Seal Gasket very carefully to avoid tearing or stretching it over the opening in the Top Housing before installing the Pan Support Note the placement of the gasket washers as shown in Figure 3 4 Gasket washers seal screw holes in the mee lt b Bottom Housing D Figure 3 6 Gasket washers seal eight receptacles in Bottom Housing Ohaus Corporation www ohaus com 3 6 Valor 2000 Series Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 10 Setting Removing Legal For Trade The Valor 2000 can be used in Legal For Trade LFT mode after being inspected and sealed in accordance with local weights and measures or approval agency regulations If the scale is serviced and the LFT seal is broken it must be re inspected and re sealed to be used again in Legal For Trade mode Note AN In LFT mode the following menus and settings are not accessible Calibration Resolution Unit AZT LFT To take the scale out of LFT mode break the mechanical seal remove the small cover on the bottom of the scale Then during power up press and hold the recessed LFT Lock Switch on the Bottom Housing All menus will then be accessible LFT mode is set through a series of menu settings and a hardware LFT switch located on the Bottom Housing Access to this switch may be denied using additional mechanical methods by local weights and measures or approval agency Follow th
12. S Model V21PW3 V21PW6 V21PW15 Calibration Weight kg 1 2 3 2 4 6 5 10 15 4 2 Operational Test 1 Connect a functioning Power Adapter to the scale power receptacle located on the bottom of the scale 2 Plug the Power Cord into a suitable power source or power the scale on using battery power Assure that the battery is charged beforehand 4 3 Segment Display Test Turn the scale on and ensure that all segments are enabled and displayed briefly The scale s model number appears next followed by a software revision number This is a Segment Display Test See Figure 4 1 Figure 4 1 Segment Display Valor 2000 Series Service Manual 4 1 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 4 4 Performance Tests Accurate performance of the Valor 2000 scales 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 NOTE The following performance tests are used to evaluate scale operation before and after repairs The scale must meet the requirements specified in each test as well as the other specifications listed in Table 1 2 Before proceeding with the following tests the scale should be calibrated See Appendix A and B 4 4 1 Precision Test The Precision Test measures the Standard Dev
13. ale in the field NOTE In all cases where a part is replaced the scale must be thoroughly checked after the replacement is made The scale MUST meet the parameters of all applicable specifications in this manual If further technical information is needed please contact your local Ohaus distributor or Ohaus Corporation www ohaus com 7 Campus Drive Suite 310 Parsippany NJ 07054 USA Tel 973 377 9000 Fax 973 593 0359 In the United States call toll free 800 526 0659 between 8 00 a m and 6 00 p m EST Valor 2000 Series Service Manual 5 1 Ohaus Corporation www ohaus com CHAPTER 5 PARTS LISTS 8 DIAGRAMS 5 1 VALOR 2000 SCALES HOUSING amp INTERNAL PARTS Figure 5 1 Valor 2000 Scales Housing amp Internal Parts Ohaus Corporation www ohaus com 5 2 Valor 2000 Series Service Manual CHAPTER 5 PARTS LISTS 8 DIAGRAMS 5 1 TABLE 5 1 VALOR 2000 SCALES HOUSING 8 INTERNAL PARTS VALOR 2000 SCALES HOUSING 8 INTERNAL PARTS Drawing Item Description 1 Pan 2 Pan Support 3 Gasket Kit Main Gasket Load Cell Seal Gasket and Gasket Washers 4 Function Label 5 Housing Top 6 Load Cell Assembly 7 Housing Bottom 8 Main PCB with LED 9 Back Display PCB with LED 10 Power PCB 11 Feet 4 Adjustable 12 Back Overlay 13 Cable Set 3 14 Bat
14. and clip Strain Gauge Simulator Ohaus Corporation www ohaus com 1 2 Valor 2000 Series Service Manual CHAPTER 1 GETTING STARTED 1 4 SPECIFICATIONS Complete specifications for the Ohaus Valor 2000 Scales are listed in Table 1 2 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 TABLE 1 1 SPECIFICATIONS Model V21PW3 V21PW6 V21PW15 Rama e une 1 6000 1 7500 1 7500 3 kg x 0 001 kg 6 kg x 0 002 kg 15 kg x 0 005 kg Capacity x Readability 30000 10 6000 9x29 150000 50 x d approved 6 Ib x 0 002 Ib 15 Ib x 0 005 Ib 30 Ib x 0 01 Ib 96 oz x 0 05 oz 240 oz x 0 1 oz 480 oz x 0 2 oz a 1 3000 1 3000 1 3000 Linearity and Accuracy 1d Off Center Load error 1d Repeatability 1d Creep 5 sec 5 min 1d Hysteresis 1d Zero drift vs temp 1 d C Span drift vs temp 1d C Zero Range 2 of Full Scale Capacity Tare Range To Full Capacity by Subtraction beyond zero range Stabilization Time lt 2 seconds Overload Indication Capacity 9d iu bud 1 at Zero 5d max Operating Temp range 0 to 40 C 32 to 104 F Storage Temp range 10 to 60 14 to 140 F Maximum relative humidity 80 for temperatures up to Humidity Range 31 88 F decreasing linearly to 50 relative humid
15. aracters represent a flashing display C flashes while the zero point is established 7022 Service Span Calibration point flashes The example shows the value for a Scale Capacity of 3 kg 3 Place the specified calibration weight on the pan and press Yes C flashes while the span point is established 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 Valor 2000 Series Service Manual B 3 Ohaus Corporation www ohaus com APPENDIX B SERVICE CALIBRATION B 6 Service Linearity Calibration This calibration method uses three points The full calibration point is established with a weight on the scale The mid calibration point is established with a weight equal to half of the full calibration weight on the scale The zero calibration point is established with no weight on the scale The mid calibration points cannot be altered by the user during the calibration procedure When S LIN appears press YES to accept the Service Linearity Calibration menu or No to advance to the End menu item O flashes The kg LED is lit to indicate the calibration unit With no weight on the pan press Yes to establish the zero point Outlined characters represent a flashing display C flashes while the zero point is established The mid calibration poin
16. at an angle in order to access the screw heads If either the Main PCB or the Load Cell is to be replaced unsolder the Load Cell Cable from the Main PCB at the four solder points on the PCB When replacing the Main PCB solder the Load Cell Cable leads to the solder points on the PCB Note the connection order from left to right red black green white To reinstall the Main PCB after soldering the Load Cell leads position the PCB on an angle in its housing insert the four screws and tighten them Re seat the white plastic Cable Tabs connecting the Power PCB and the Rear Display PCB to the Main PCB Position the PCB Cover over the screw holes insert the eight screws and tighten them Re insert the Cable Plugs in the PCB Cover Valor 2000 Series Service Manual 3 3 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES 3 5 Replacing the Rear Display PCB First be sure the eight screws securing the PCB Cover have been removed and that the cable plug has been lifted out Then proceed as follows 1 2 5 6 Pull the white Cable Tab that connects the Rear PCB to the Main PCB Remove the two screws that hold the PCB in place Lift out the PCB and position its replacement over the screw holes in the housing Insert the four screws and tighten them Re seat the white plastic Cable Tab connecting the Main PCB to the Rear Display PCB Position the PCB Cover over the screw holes insert the four screws an
17. battery in accordance with local regulations Check the battery for any irregularities in appearance If there is any damage to the case such as cracks deformation or leakage replace it Do charge the battery with the charger terminals reversed ONLY connect red cables to red positive terminals and black to black negative 1 Remove the two screws from the battery bracket and lift out the bracket Carefully lift out the battery avoid straining the cables Pull the quick connect tabs free of the battery and reinstall them in the new battery oo Set the replacement battery and a bracket on top of it and install the two screws Valor 2000 Series Service Manual 3 5 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES 3 10 Replacing the Gaskets The Main Gasket that seals the opening between the two housings may need to be replaced because of wear or corrosion This may also be true of the small gasket washers that seal the screw holes in the Bottom Housing the Load Cell Seal Gasket also called the Bellows Gasket and the metal seal washers for the bolts that secure the Pan Support and Load Cell on the Top Housing They are sold as a set The Main Gasket fits snugly on the lip of the Bottom Housing Install it there first Then the Top Housing will fit correctly when the two housings are put together Note Remember to install the Main Gasket before reconnecting the cable that links the
18. d Cell to Top Housing esses 3 2 3 4 Top and Bottom Housings with some plugs removed 3 3 3 5 Power PCB housing next to the rechargeable 3 5 3 6 Gasket washers seal eight receptacles in Bottom Housing 3 6 4 1 Segment Display u reet erect eddie in Bella 4 1 4 2 Scale drawing of Valor 2000 Load Cell and Weighing Pan 4 4 5 1 Valor 2000 Scales Housing amp Internal 5 2 Valor 2000 Series Service Manual ii Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 1 INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus Valor 2000 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 Contains information on service facilities tools and test equipment specifications and the mechanical and electronic functions of the scale Chapter 2 Troubleshooting Contains a diagnostic guide and error code table Chapter 3 Maintenance Procedures Contains preventive maintenance procedures and disassembly repair and replacement procedures Chapter 4 Testing Contains a list of required test masses an operational test segment disp
19. d full load output The reading should meet the Load Cell specifications The Load Cell output should be very close to linear over its capacity range NOTE The following steps involve power applied to the scale Load Cell solder contacts can be used as measuring points See Figure 2 1 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 2000 TABLE 2 2 COLOR CODE FOR LOAD CELL WIRING BLACK RED GREEN WHITE EXE EXE SIG SIG Color codes may vary Insert the Platform Support into the Load Cell Frame place the Platform on top and turn on power to the scale Using a voltmeter measure and record the excitation voltage supplied to the PCB with no load on the Platform measure the voltage across points 3 and 4 of Load Cell connection on the PCB EXE and EXE This voltage must be approximately 5 0 Volts dc with the Load cell connected If the voltage is lower disconnect the Load Cell cable from the PCB and measure again If the voltage is 5 Volts dc the Load Cell is defective and must be replaced If the voltage remains low the PCB is defective and must be replaced CAUTION IN THE NEXT STEP DO NOT OVERLOAD THE SCALE BEYOND FULL CAPACITY RATING Ohaus Corporation www ohaus com 2 2 Valor 2000 Series Service Manual CHAPTER 2 DIAGNOST
20. d tighten them Re insert the Cable Plugs in the PCB Cover 3 6 Removing Replacing the Load Cell The Load Cell may need to be replaced because of balance instability or because the balance does not calibrate or repeat or because it is physically broken or displays an error code Note There is no need to disassemble the Load Cell It is supplied as an assembled unit See Chapter 5 for parts information 1 Remove the two bolts in the Top Housing that secure the Load Cell 2 Be sure the six screws securing the Load Cell Cover have been removed and that the Cable Plugs have been lifted out 3 Gently lift the Load Cell away from the housing 4 If the Load Cell is to be replaced or the off center load adjusted unsolder the Load Cell Cable from the Main PCB in order to completely remove the Load Cell from the housing 5 When installing the replacement Load Cell first insert and tighten the two bolts in the Top Housing Then re solder the Load Cell Cable to the Main PCB Then insert and tighten the six screws that secure the Load Cell Cover Note There is no need to remove the bolts in the metal bracket surrounding the Load Cell unless it is necessary to adjust the Up Down Stops Ohaus Corporation www ohaus com 3 4 Valor 2000 Series Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 7 Removing Replacing the Power Supply The Valor 2000 s power supply is located in the Power PCB Housing To replace it
21. e agree the 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 2000 Series Service Manual 2 5 Ohaus Corporation www ohaus com CHAPTER 2 DIAGNOSTIC GUIDE 2 2 4 Diagnostic Guide TABLE 2 4 DIAGNOSTIC GUIDE Symptom Possible Cause Remedy Unstable weight Air flow may be blocked to Adjust rear feet at least slightly to scale because rear feet are allow proper air flow They should tightened completely be tightened when scale is washed Busy message Displayed while zero or tare function is in process C Busy message Displayed while calibration data is being collected CLEA Clear pan message Weight reading exceeds zero limit Remove load from scale dang Calibration process is completed OFF Off message Scale is turning off nn Requested action is not allowed LabRE Low Battery Battery charge is too low Recharge battery IR E Calibration Error Calibration point value is outside of acceptable range See Appendix A or B Err i Error 1 Overload limit Weight reading exceeds capacity exceeded plus 9d Remove load from scale Recalibrate scale Err a Error 2 Underload limit Weight reading is below calibration exceeded zero value by 30 of scale capacity Add load to scale Recalibrate scale Err 8 Error 9 Menu data checksum Menu data in EEPROM s corrupted error Cycle powe
22. e with the 3 kg linearity weight on the pan Valor 2000 Series Service Manual A 3 Ohaus Corporation www ohaus com APPENDIX A STANDARD CALIBRATION Ohaus Corporation www ohaus com A 4 Valor 2000 Series Service Manual APPENDIX B SERVICE CALIBRATION APPENDIX B SERVICE CALIBRATION This section describes the Service Menu and sub menus which allow authorized service personnel to perform factory Linearity and Span calibrations no pre set limits Note AN Be careful not to touch the scale or the surface it rests on while calibration is in progress as it will cause the process to fail B 1 Entering the Service Menu Turn the scale off Press and hold ON gt O T lt Off and UNIT Menu for 10 seconds until SErVC appears B 2 Ramp Menu When S rAMP appears press YES to accept the Ramp menu or NO to NM advance to the Service Calibration menu item The ramp display shows the percentage of use of the A to D circuit that is of the temper ature compensated duty cycle The actual value is not as important as how it changes It should increase as the weight on the scale is increased The ramp display should remain constant without fluctuations If you press Yes to select Ramp a number appears It should be constant Add masses from minimum to maximum capacity The reading will increase but should not fluctuate The Ramp value is displayed as a percent of the A D range mnm Press YES to advance to the Ca
23. ed due to corrosion of the rubber inside lining Figure 3 1 Bolts and washers securing Pan Support to Top Housing 3 Turn the scale over Remove the Screws and washers gt two screws that secure the LFT that secure the Housing Lock Switch Cover and lift it off 4 Remove the eight screws holding the Housing in place See Figure DES seal 3 1 Note six of the screws are for power long the two that secure the front input of the scale are short jack 17 JN 5 Carefully separate the Top Housing from the Bottom Housing There may be some resistance caused by the Seal Gasket Avoid straining x LFT Lock the cable set that connects the Switch Main PCB in the top housing to the Power PCB in the bottom housing Figure 3 2 Scale Bottom Lay the two housings close to each other so the PCB cable is not strained Remove cable plugs component covers and screws holding cables to the Housing Lift out Seal Gasket Set it aside N To remove the Load Cell carefully turn the scale over and remove the two bolts and washers that secure the Load Cell to the Top Housing Check if the washers need to be replaced due to corrosion of the rubber inside lining Hold the Load Cell from underneath so it doesn t fall when the bolts are removed Figure 3 3 Bolts and washers securing Load Cell to Top Housing oz Stable Charge Ohaus Corporation www ohaus com 3 2 Valor 2000 Series Service Man
24. er or on the internal rechargeable battery The scale automatically switches to battery operation if it is on and AC power fails The battery must be fully charged for up to 12 hours before operation Charge level is indicated during charging See Table 1 3 The scale can be operated during charging The battery is protected against over charging and the scale can remain connected to the AC power line TABLE 1 3 BATTERY CHARGE STATUS Charge Status Indication Light Charge Level Off Fully Charged Flashing Green 70 100 Flashing Yellow 40 70 Flashing Red 0 40 Allow 20 minutes warm up time The scale should be calibrated before use Note If Auto Off is set to ON it must be set to OFF to allow 20 minutes warm up time See Menu Setup next page AN Note To prevent water ingress during use insert rubber Seal into the input jack recess Also note that prior to use the rear adjustable feet should be opened at least a half turn There are tiny air vents on the inside of these feet which allow the scale to breathe since it is designed to be water tight a 2 Figure 1 2 Waterproof seal on power eet snou e kb 1 input jack opened at least a half turn 1 5 3 Power OFF To turn the scale OFF press and hold ON 2O T Off until OFF appears then release Valor 2000 Series Service Manual 1 5 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 5 4 Menu Set
25. ese steps to set the scale for LFT mode 1 Calibrate the scale See Appendix A 2 To access the Service Menu press and hold UNITS Menu until MENU appears then release it Press Yes Then press No continuously until LFT appears Press Yes Press No until End appears Then press Yes to return to weighing mode 3 Re install the LFT Lock Switch Cover 3 9 Replacing the Function Label The Function Label may need to be replaced either due to corrosion or wear See Chapter 5 for parts lists Use a broad knife to remove the label Clean the glue residue from the Housing surface Then carefully place the new label where the old one was Valor 2000 Series Service Manual 3 7 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES Ohaus Corporation www ohaus com 3 8 Valor 2000 Series Service Manual CHAPTER 4 TESTING 4 1 TESTING Before and after servicing a Valor 2000 scale an operational test and various performance tests should be made to confirm that the scale meets specifications Turn the scale on and allow it to warm up for at least one hour before performing these tests NOTE AN Make sure the test area is free from drafts and that the scale rests on a level and vibration free surface 4 1 1 TEST MASSES REQUIRED The masses required to test the Ohaus Valor 2000 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 VALUE
26. he area beneath the Pan 2 Clean the outside of the scale using a damp cloth with warm water CAUTION AN DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE S FINISH 3 Check the Power Cord for broken or damaged insulation 4 If using the rechargeable battery and the scale malfunctions first recharge the battery to see if this resolves the problem 5 Make a visual inspection for faulty connectors wiring and loose hardware 3 2 SERVICE STRATEGY All parts of the Valor 2000 or designed to be replaced rather than repaired This includes the Main Printed Circuit Board PCB the Rear Display PCB the Load Cell the Power PCB the Rechargeable Battery and the cables that connect them For an illustrated list of replaceable parts see Chapter 5 3 3 OPENING THE SCALE Use these procedures in order to replace the Load Cell Battery any of the Printed Circuit Boards and or LCD Displays Valor 2000 Series Service Manual 3 1 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES 3 3 1 Separating the Top and Bottom Housings Common hand tools are sufficient to disassemble the Valor 2000 scales Turn the scale off and unplug the power cord before you begin 1 Lift off the Weighing Pan from the Pan Support 2 Remove the Pan Support by removing the bolts and washers that secure it to the Load Cell and then lift it off Check if the washers need to be replac
27. iation of a set of similar weight readings which should match the specification for each model listed in Table 1 1 1 Power on the balance The reading on the display should be Og 2 Select a mass weighing near the maximum capacity of the balance and place it on the center of the Pan Observe and record the reading 3 Remove the mass The reading should return to 0g 1 count 4 Repeat this test three times The reading should be within 1 count of the reading recorded If so the balance passes the Precision Test 5 Ifthe deviation for any set of readings using the same mass placed on the center of the Pan is greater than 1 d the balance does not meet the precision specification Inspect and correct the following areas Check for mechanical obstructions Any foreign object touching any part of the moving assemblies will cause a balance to fail the Precision Test Inspect and correct as necessary Ifthe scale does not meet specifications move it to a suitable location ensure that it is level and try again If it still does not meet specifications perform a service calibration and try again See Appendix B for Service Calibration Ohaus Corporation www ohaus com 4 2 Valor 2000 Series Service Manual CHAPTER 4 TESTING 4 4 2 Repeatability Test Repeatability is the Standard Deviation of a set of similar weight readings Requirements perform this test a single mass must be used for all readings
28. ight on the pan and press Yes B C flashes while the span point is established E If span calibration was successful dONE appears for 1 5 seconds ae Then the scale exits to the weighing mode and displays the actual weight arm value The example shows a 2 kg span weight on the pan Linn Note Calibration may be aborted at any time by turning the scale off nr E NOTE If calibration fails ensure that the test area is free from drafts and the surface the scale rests on is level and free of vibrations 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 Ohaus Corporation www ohaus com A 2 Valor 2000 Series Service Manual APPENDIX A STANDARD CALIBRATION A 1 2 Linearity Calibration Linearity calibration uses three calibration points The first is established with no load on the scale The second and third are established at mid capacity and full capacity See Table 4 3 To enter the Calibration menu press and hold UNIT Menu until CAL appears Press Yes SPAN appears Press No LINEAr appears Press YES O flashes The kg LED is lit to indicate the calibration unit A With no weight on the pan press Yes to establish the zero point Outlined characters represent a flashing display XC E NC Note If the pan is not empty 20 of the factory calibration zero value CLEAr PAN flashes for a timeout period
29. ity at 40 104 F non condensing Safe Overload Capacity 120 of capacity AC Power 9VDC 700mA Valor 2000 Series Service Manual 1 3 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 5 SCALE OPERATION This section contains information on the basic operation of the scale 1 5 1 OVERVIEW OF THE CONTROLS e Stable Charge Zero Tare On Off Yes No Figure 1 1 Valor 2000 Front Display with controls The display and LEDs are duplicated on the rear of the scale to facilitate customer viewing TABLE 1 2 FUNCTIONS OF DISPLAY CONTROLS Zero Tare Units On Off Menu Yes No Primary Function ON gt 0 T lt UNITS Short Press Turns scale ON Changes the weighing Unit If scale is On Sets zero Performs a tare operation Secondary Function Off Menu Long Press Turns scale off Enter the User menu Menu Function Yes No Short Press Accepts the current setting on Advances to the next menu or the display menu item Rejects the current setting on the display and advances to the next available setting Ohaus Corporation www ohaus com 1 4 Valor 2000 Series Service Manual CHAPTER 1 GETTING STARTED 1 5 2 Power ON With power applied press On O T Off All segments will appear briefly followed by Ohaus a software revision number and then 0 00 g The scale can operate on either AC Power with the included AC adapt
30. lay test performance tests and adjustments Chapter 5 Drawings and Parts Lists Contains exploded views of Valor 2000 scales identifying all serviceable components Appendix A Standard Calibration Explains procedures for Standard Calibration performed prior to using a scale and after service Appendix B Service Calibration Describes the Service Menu and sub menus which allow authorized service personnel to perform factory Linearity and Span calibrations no pre set limits take Ramp readings and to set the service menu units 1 2 SERVICE FACILITIES To service a scale the service area should meet the following requirements e Should be temperature controlled and meet scale specifications for temperature environmental requirements e Must be free of vibrations such as fork lift trucks close by large motors air currents or drafts from air conditioning heating ducts open windows people walking by fans etc e Area must be clean and free of excessive dust e Work surface must be stable and level e Scale must not be exposed to direct sunlight or radiating heat sources e Use an approved Electro Static Device Valor 2000 Series Service Manual 1 1 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 3 TOOLS AND TEST EQUIPMENT REQUIRED The service shop should contain the following equipment 1 2 Standard hand tools Digital Voltmeter DVM Standard Electronics tool kit Grounding mat
31. ng See Section 3 3 1 Leave the Membrane Switch connected to the scale Disconnect the battery Disconnect the Load Cell cable from the main PC Board With the Simulator set to zero solder its cable leads to their counterparts on the PCB using the Load Cell Cable solder points on the PCB See Figure 2 1 Connect a known good AC Adapter to the scale and connect to a power source Turn on the scale An under load error may appear This is normal Set the scale to indicate weight in kilograms kg and set the calibration value to maximum span value Adjust the Simulator to simulate 0 load 50 load and 100 load for the capacity that the scale is rated for See Table 2 3 for values to use If the resulting readings are unstable the Main PC Board is defective Use the Simulator to calibrate the scale in the next procedure to verify if the Main PC Board is good or bad 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 enter the scale menu and perform a span calibration See Appendix A Follow the scale prompts When the scale indicates a given weight to be placed on the scale set the simulator to an equivalent value based on Table 2 3 Upon completion of calibration the PCB can be further checked using the Simulator to simulate various weight values If simulator settings and weight readings on the scal
32. of five seconds If the load is not stable within ten seconds or the value is not within the 20 limit CAL E appears for three seconds and the scale returns to the weighing mode The previous user calibration data is used and the current weight is displayed C appears while the zero point is established The mid calibration point value flashes Place the specified calibration weight on the pan and press Yes The example shows the mid calibration point value for a scale capacity of 3 kg Note The new mid calibration value must be stable and within 5 of the TIMES stored factory mid calibration value If the load is not stable within 10 LHL seconds or the value is not within the 5 limit CAL E flashes for three seconds and the scale returns to the weighing mode and the currently active unit of measure The previous user calibration data is used and the current weight is displayed C flashes while the mid point is established Et e The full calibration point value flashes Place the specified calibration weight on the pan and press Yes The example shows the full calibration 3 point value for a Scale Capacity of 3 kg C flasheswhile the full point is established 2 5 E ad a If linearity calibration was successful ONE appears for 1 5 seconds The scale exits to the weighing mode and displays the actual weight value 4n in the currently active unit of measure The example shows the WEIGH 21 04 mod
33. pacity menu item Lt t Press NO to exit to the weighing mode to Note Ramp is used to troubleshoot load cell problems 0 represents no pap m 00000 01 signal from the A D 100 reflects the upper signal range of the A D B 3 Capacity Menu E ru When S CAP appears press YES to accept the Capacity menu item PIA or press NO to advance to the Unit menu item The current Capacity Setting is displayed blinking Outlined characters represent a flashing display 3 Note The available settings are 3 6 and 15 The default setting is 3 7 Press NO to step through the settings Press YES to accept the setting SS and move to the Service Unit menu item L Valor 2000 Series Service Manual B 1 Ohaus Corporation www ohaus com APPENDIX B SERVICE CALIBRATION B 4 Service Unit Menu When S UNIt appears press YES to accept the Service Unit menu item or NO to advance to the Service Calibration menu item When S UNIt appears and the kg LED is lit press YES to accept the kg menu item or NO to advance to the Gram Unit menu item The Kilogram Unit menu item setting appears blinking The available settings are Off and On The default is On for all models Press NO to step through the settings Press YES to accept the setting and move to the Gram Unit menu item When S UNIt appears and the g LED g is lit press YES to accept the Gram Unit menu item or NO to advance to the Pound Unit menu item The Gram Unit menu i
34. r on and off If error continues check menu settings If problem continues replace PCB Err Error 14 Initial Zero limit error Weight reading exceeds 10 Power On Zero limit when LFT is set to ON Place platform on the balance If the problem continues add a small amount of weight at power on If the problem persists perform span and linearity calibration from Service menu See Appendix B Ohaus Corporation www ohaus com 2 6 Valor 2000 Series Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 1 PREVENTIVE MAINTENANCE Ohaus scales are precision instruments and should be carefully handled stored in a clean dry dust free area and cleaned periodically Follow these precautionary steps When a scale has had chemicals or liquids spilled on it all exterior surfaces should be cleaned as soon as possible with warm water on a damp cloth Do not leave a mass on the scale when the scale is not in use Allow time for the scale to stabilize after moving it from an area which is at a different temperature than the area where it is to be operated Allow one hour for each 5 F 2 7 C temperature change before using the scale After temperature stabilization allow an additional 20 minutes after turning the scale on for the scale electronics to stabilize 3 1 4 Preventive Maintenance Checklist The scale should be inspected and checked regularly as follows 1 Remove the Pan and Sub Pan to inspect and clean t
35. s 3 2 3 2 2 Removing the Component Covers and Lifting Out the Cable Plugs 3 3 3 4 Removing Replacing the Main Printed Circuit Board 3 3 3 5 Replacing the Rear Display 3 4 3 6 Removing Replacing the Load Cell ke 3 4 3 7 Cable Set Heplacemiefil eoo rrr netter i ee RE red 3 5 3 8 Replacing the Battery aa ere ea 3 5 3 9 Replacing the EE 3 5 3 10 Setting Removing Legal tor Trade ke 3 6 3 11 Replacing the Function Label nicas 3 6 CHAPTER 4 TESTING A Se SWING WE 4 1 4 1 1 Test Masses Required kee 4 1 4 25 Operational Test ae 4 1 43 Segment Display TOS lacus 4 1 44 Performance Tesista Neue Nele 4 2 4 4 1 Precision Test a a ala al aa ia 4 2 4 4 2 Repeatability Test ts lls aoe AN ista 4 3 AAS SN RE TOS saca ioana panera meat genta al 4 5 AAA Off Center Load Test ne 4 5 4 4 5 Adjusting Off Center Lo dde titi 4 6 Ohaus Corporation www ohaus com i Valor 2000 Series Service Manual TABLE OF CONTENTS Page No CHAPTER 5 DRAWINGS AND PARTS LISTS 5 1 Valor 2000 Scales Housing Internal Parts 5 2 Appendix A STANDARD CALIBRATION JS NE 87 11 018 116 AE A 1 A 1 1 Span Calibration s kt nce trot dci A 2 A 1 2 Linearity Calibration sues tiere p tet ple eee reli A 3 Appendix B SERVICE CALIBRATION B 1
36. s and divide the total by 10 to find the Mean average Mean Reading 1 Reading 2 Reading 3 Reading 4 Reading 5 Reading 6 Reading 7 Reading 8 Reading 9 Reading 10 10 Mean Calculate the Delta for each reading and record in the work sheet Delta Reading Mean 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 Note If the balance does not meet specifications move it to a suitable location ensure that it is level and try again If it still does not meet specifications perform a service calibration and try again See Appendix B for Service Calibration Ohaus Corporation www ohaus com 4 4 Valor 2000 Series Service Manual CHAPTER 4 TESTING 4 4 3 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 AN NOTE The scale must pass the Precision and Repeatability Tests and be calibrated before the Linearity Test may be performed TABLE 4 3 LINEARITY TEST MASSES Capacity 3000x 5g 6000x1g 15000 20 Reference Wt 750 1500 3000 Load 1 750 1500 3000 Load 2 1500 3000 9000 Load 3 2250 4500 12000 NOTE All masses are nominal values Use the same reference
37. t value flashes The kg LED is lit to indicate the calibration unit The example shows the mid calibration point value for a Scale Capacity of 3 kg Place the specified calibration weight on the pan and press Yes C flashes while the mid point is established The full calibration point value flashes The kg LED is lit to indicate the calibration unit The example shows the full calibration point value for a Scale Capacity of 3 kg Place the specified calibration weight on the pan and press Yes C flashes while the full point is established If linearity calibration was successful the actual weight reading appears for three seconds followed by the S End menu item The example shows a 3 kg span weight on the pan If linearity calibration was successful S End appears Press YES to exit the Service menu and return to the weighing mode or NO to return to the first Service menu item NOTE If calibration fails ensure that the test area is free from drafts and the surface the scale ES DON 004 0 0 0 rests on is level and free of vibrations 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 Ohaus Corporation www ohaus com B 4 Valor 2000 Series Service Manual OHAUS 8 0 2 5 2 5 8 9 P N 80252589B SERVICE MANUAL Valor 2000 SERIES SCALES
38. te Prior to the voltage measurements the battery should be fully charged and tested 1 Disconnect power from the scale and remove the Top housing See Section 3 3 1 2 Connectthe AC Adapter to the scale and turn the scale on 3 Using a DVM measure the excitation voltage EXE and EXE in Figure 2 1 The reading should be 5 volts dc This is the excitation voltage for the Load Cell and is regulated If the voltage is lower replace the PCB See Section 3 4 Then perform Operational Tests See Chapter 4 4 Measure incoming power from the AC Adapter Connector shown in Figure 2 1 The voltage should read between 9 and 14 volts dc with power off and above 9 Volts dc with power on 5 Perform simulator testing Ohaus Corporation www ohaus com 2 4 Valor 2000 Series Service Manual CHAPTER 2 DIAGNOSTIC GUIDE 2 2 3 Testing the Printed Circuit Board PCB Simulator Testing To perform these tests the use of a Simulator is required The 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 The Load Cell used in the scale is rated at 2mV V output with a 5 Volt excitation voltage applied General Load Test This test checks the Main PC Board circuitry by simulating accurate Load Cell voltages at zero load 50 and 100 load capacities 1 Disconnect power from the scale and remove the Top housi
39. tem setting appears blinking The available settings are Off and On The default is On Press NO to step through the settings Press YES to accept the setting and move to the Pound Unit menu item When S UNIt appears and the Ib LED is lit press YES to accept the Pound Unit menu item or NO to advance to the Ounce Unit menu item The Pound Unit menu item setting appears blinking The available settings are Off and On The default is On Press NO to step through the settings Press YES to accept the setting and move to the Ounce Unit menu item When S UNIt appears and the oz LED is lit press YES to accept the Ounce Unit menu item or NO to advance to the Service Unit menu item The Ounce Unit menu item setting appears blinking The available settings are Off and On The default is On Press NO to step through the settings Press YES to accept the setting and move to the Service Calibration menu cr o 2 00 LU bk ann E Ohaus Corporation www ohaus com B 2 Valor 2000 Series Service Manual APPENDIX B SERVICE CALIBRATION B 5 Service Span Calibration When S CAL appears press YES to accept the Service Calibration menu E or NO to advance to the End sub menu selection When S SPAN appears press YES to accept the Service Span Calibration menu or No to advance to the Service Linearity Calibration menu 0 flashes With no weight on the pan press Yes to establish the zero D point Outlined ch
40. tery Bracket 15 Battery Rechargeable 16 Hardware Kit 17 LFT Sealing Kit 18 Level Bubble 80 Adapter Note The Parts List is identical for all Valor 2000 models For parts numbers see your local Ohaus distributor or visit www Ohaus com Valor 2000 Series Service Manual 5 3 Ohaus Corporation www ohaus com CHAPTER 5 PARTS LISTS amp DIAGRAMS Ohaus Corporation www ohaus com 5 4 Valor 2000 Series Service Manual APPENDIX A STANDARD CALIBRATION APPENDIX A STANDARD CALIBRATION A 1 CALIBRATION Standard calibration should be performed prior to using a scale and after service See Section 4 2 for Calibration Masses required for each model Note AN Be careful not to touch the scale or the table while calibration is in progress as it will cause the process to fail Preliminary Steps 1 Be sure the scale is level and stable during the entire calibration process 2 If LFT is set to On calibration is unavailable To set LFT to OFF see Section 1 10 page 1 19 Note To use the LFT mode again after turning it off it is necessary to have the scale locked and sealed by local Weights and Measures authorities 3 Allow the scale to warm up for approximately 20 minutes after stabilizing to room temperature 4 To abort calibration press the Exit button anytime during the calibration process Valor 2000 Series Service Manual A 1 Ohaus Corporation www ohaus com APPENDIX A STANDARD CALIBRATION A
41. ual CHAPTER 3 MAINTENANCE PROCEDURES 3 3 2 Removing the Component Covers and Lifting Out the Cable Plugs Power PCB Cover Figure 3 4 Top and Bottom Housings with some pl ugs removed 1 Remove the screws that secure the cables to the housing to avoid straining the cables when loosening the plugs 2 Firmly grasp the plugs and lift them clear of the component covers Don t try to remove them completely until they are disconnected from the PCBs 3 Remove the screws that secure the component covers to the housing The PCB covers on the Top Housing must be removed before the Load Cell Cover to allow it to clear Only remove the Power Supply Cover if the Power PCB is to be replaced 3 4 Removing Replacing the Main Printed Circuit Board PCB The Main PCB must be removed in order to replace the Load Cell since the Load Cell Cable is soldered to the Main PCB First be sure the eight screws securing the PCB Cover have been removed and that the cable plugs have been lifted out Then proceed as follows 1 Pull the two white Cable Tabs that connect the Main PCB to the Power PCB and the Rear Display PCB It is necessary to hold the PCB Cover by hand at an angle while pulling the Cable Tabs Once the Cable Tabs are freed the PCB Cover can rest slightly away from the PCB allowing access to the screws that hold the PCB in place Remove the four screws that hold the PCB in place It is necessary to hold the screwdriver
42. up Programmable features of the Valor 2000 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 TABLE 1 5 VALOR 2000 MENU STRUCTURE mu za ES ri ES un it F iLer Ret 4 gran L un kg LD FF n 7 4 n LU n D 5 id 3 25 d r ES EA ES r E3 C3 1 5 5 Menu Navigation Press and hold UNITS Menu button until MENU is displayed then release it Press Yes to enter the displayed menu or press No to advance to the next menu When viewing the menu setting press Yes to accept the setting or press No to change it then press Yes to accept the setting and move to the next menu When End is displayed press Yes to exit the menu Ohaus Corporation www ohaus com 1 6 Valor 2000 Series Service Manual CHAPTER 1 GETTING STARTED 1 6 LEGAL FOR TRADE When LFT is set to ON the following menu settings cannot be accessed changed Calibration Resolution Unit AZT LFT To regain access to the locked menu settings remove the small cover on the bottom of the scale Then during power up press and hold the recessed lock switch momentarily until zero is displayed Hl Figure 1 3 LFT Lock Switch When accessing the bottom of the scale avoid placing the scale upside down on the pan or sub platform Place
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