SERVICE MANUAL
Contents
1. 5 2 Appendix A STANDARD CALIBRATION AT Galibrati n a entre eros oo des A 1 A 2 Setup and CGalbraton nennen nnne A 2 Appendix B SERVICE CALIBRATION B 1 Service Menu Gtruchure eene eene nennen nnne B 1 B 2 Entering the Service Menu B 1 B3 Capacity Menu etel ierat p hp ERR B 2 B 4 Graduation Men B 2 B 5 Service Span Calibration sss eee B 2 B 6 Service Linearity Calbratton emen B 3 Bi Ramp Merntls ce tete teet tee bee ie tdt e edes B 4 8 Expand Menus ER e Ze B 4 B 9 End eee ee iier Nace B 4 LIST OF TABLES TABLE NO TITLE Page No 1 1 Specifications te cete tts rte ta o cte be Doo E A ue 1 2 1 2 Controls e Tue EE 1 3 1 3 Battery Charge Status 2 1 2 4 ice aret ree tee ee eere pe nu vta 1 4 1 4 Menu Gtruchure seen nnnm nemen rennen rennes 1 5 2 1 Load Cell Resistance Readings in Ohms 2 2 2 2 Color Code for Load Cell Wiring aces 2 2 2 3 Load Cell Output Readings in mV with 3 3V Evchtatton 2 3 2 4 Diagnostic Guide eer etr n Ee 2 6 3 1 Mounting Bolt Torque Gettngs eee 3 5 3 2 Overload Stop Gap Settings ssssssssssssseeee eee 3 6 4 1 Test Mass Vali8S cd inerat ee t e HR HR ERR RR bee ted 4 1 4 22. will be displayed while zero reading is L stored Next the display shows the calibration weight value e g 3 3 a 4 Place the specified calibration mass on the pan Press Yes to accept E the weight or No to select an alternate weight C will be displayed while the reading is stored 5 The display will show da E if the calibration was successful The scale dank returns to the previous application mode and is ready for use Ohaus Corporation www ohaus com A 2 Valor 7000 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 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 Service Menu Structure Cap Grad Span Lin Ramp Expand End B 2 Entering the Service Menu Turn the scale off Press the On Zero then hold the Function and M keys simultaneously for 6 seconds until S E r U C E is displayed Valor 7000 Series Service Manual B 1 Ohaus Corporation www ohaus com APPENDIX B SERVICE CALIBRATION B 3 Capacity Menu When CAP appears press YES to accept the Capacity menu item or press NO to advance to the menu item The current Capacity Setting is displayed blinking Outlined characters repr
3. OHAUS SERVICE MANUAL VALOR 7000 Ohaus Corporation 7 Campus Drive Suite 310 Parsippany NJ 07054 973 377 9000 Pd OHAUS SERVICE MANUAL VALOR 7000 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 30072403 Copyright 2013 Ohaus Corporation all rights reserved TM Registered trademark of Ohaus Corporation TABLE OF CONTENTS Page No CHAPTER 1 GETTING STARTED T1 Introductions oen Envie 1 1 1 2 Service Facilities 1 1 1 3 Tools and Test Equipment HReoured sese eene 1 1 1 4 Specifications n ere here e ate rece Ge Pel Te P e neiges 1 2 1 5 Scale Operation Valor 000 1 3 1 5 1 Overview of the Controls ener enne 1 3 1 5 2 Power OniOnt nennen ennemis nenne nennen nene n nnne 1 4 15 37 Menu Setlp ui eb n Eten eee E eet rire des 1 5 1 5 4 Menu Navigation 1 5 E bt Be EIB og 9 fa trade EE 1 6 ES en Settings ino en Dette ee oe a at ee ede 1 6 Ee e EE 1 6 ln EE 1 6 CHAPTER 2 TROUBLESHOOTING 2 4 Troubleshootilg mn wine we way E ee KEE ede 2 1 2 2 Diagnostic Guide ea d ee tede hri Fee ends 2 1 2 22 Diagnosis x ee eee a 2 1 2 2 2 Checking Load Cells for Trouble 2 2 2 2 3 T
4. R31 R21 RC31 RC21 V71 30037401 LoadCell AMI C3 3kg V71P1502T 30037402 LoadCell AMI C3 5kg V71P3T 6 30037403 LoadCell AMI C3 11kg V71P6T 30037404 LoadCell AMI C3 22kg V71P15T 30037405 LoadCell AMI C3 40kg V71P30T 7 30037435 Spider Down R31 R21 RC31 RC21 V71 8 30037420 Hardware Kit R31 R21 RC31 RC21 V71 9 30037400 Housing Bottom V7 1 10 30037421 Feet R31 R21 RC31 RC21 V71 11 30037422 Cover Option R31 R21 RC31 RC21 V71 12 30037392 Switch Power R31 RC31 V71 13 30037428 PCBA Main R31 RC31 V71 14 71168359 Battery Lead Acid R31 R21 RC31 RC21 V71 15 30037419 Harness R31 R21 RC31 RC21 V71 16 30037438 PCBA IR sensor with a IR cover V71P 17 30037430 PCBA Display LCD R31 R21 V71 18 30037433 PCBA Display LCD rear V71 NA 30037383 Packaging Box carton R31 R21 RC31 RC21 V71 NA 30037384 Packaging Box complete R31 R21 RC31 RC21 V71 NA 30037457 Manual Instr JP V71 NA 30060919 Manual Instr KR V71 NA 72200232 Line Cord US NA 72200229 Line Cord EU NA 72200228 Line Cord AU NA 72200231 Line Cord GB NA 72200230 Line Cord JP NA 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 5 3 Ohaus Corporation www ohaus com APPENDIX A STANDARD CALIBRATION APPENDIX A STANDARD CALIBRATION amp SETUP A 1 CALIBRATION Standard calibration should be performed prior to using a scale and after service NO
5. 0 0002 kg 0 0005 kg 0 001 kg 0 002 kg Creep 30 min 7 K 0 5e MPE 0 0002 kg 100 0005 kg 0 001 kg 0 002 kg 0 005 kg Stabilization Time 1 sec 1 sec 1 sec 1 sec 1 sec Combined effect Increasing MPE MPE MPE MPE MPE Decreasing Load Zero Drift vs E H E Temp 2d C 0 0001 kg C 0 0002 kg C 40 0005 kg C 240 001 kg C 0 002 kg C Span Drift vs Temp 1d C o o o e o ai o Less or equal than 16 7ppm C 16 7ppm C 16 7ppm C 16 7ppm C 16 7ppm C MPE Operating fo e fo fo Conditions 10 C to 40 C 10 C to 40 C 10 C to 40 C 10 C to 40 C 10 C to 40 C Storage 40 C to 60 C 40 Cto60 C 40 C to60 C 40 Cto60 C 40 C to 60 C Temperature 9 9 k li Q Pan Size 225 x 300 mm 225 x 300 mm 225 x 300 mm 225 x 300 mm 225 x 300 mm Ohaus Corporation www ohaus com 1 2 Valor 7000 Series Service Manual CHAPTER 1 GETTING STARTED 1 5 SCALE OPERATION VALOR 7000 This section contains information on the basic operation of the Valor 7000 scale 1 5 1 OVERVIEW OF THE CONTROLS r 1532 7 O kao OOOO oHaus V PT em am v 02 vov mee a az VALOR 7000 Tare On Zero Print Function M Off Units Mode Menu Yes No Back Exit Figure 1 1 Valor 7000 Front Display with con
6. 1 Volts dc the Load Cell is defective and must be replaced If the voltage remains low the PCB is defective and must be replaced Ohaus Corporation www ohaus com 2 2 Valor 7000 Series Service Manual CHAPTER 2 DIAGNOSTIC GUIDE CAUTION IN THE NEXT STEP DO NOT OVERLOAD SCALE BEYOND FULL CAPACITY RATING 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 Le LU f Hn Figure 2 1 Top view of main PCB 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 V with 3 1V Excitation Model Capacity Zero Load 50 Load 100 Load V71P1502T 1 5kg 0 492666667 0 992666667 1 49266667 V71P3T 3kg 0 2956 0 8956 1 4956 V71P6T 6kg 0 1478 0 7478 1 3478 V71P15T 15kg 0 0739 0 8239 1 5739 0 03695 0 78695 1 53695 V71P30T 30 kg Valor 7000 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 si
7. CELL RESISTANCE READINGS in Ohms Model Ex to Ex S to S Ex to S Ex to S Ex to S Ex to S All models 404 10 350 4 289 10 289 10 289 10 289 10 Perform an Output Voltage Test Measure the no load 5096 load and 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 7000 TABLE 2 2 COLOR CODE FOR LOAD CELL WIRING AMI BLACK GREEN WHITE RED 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 4 and 1 of Load Cell connection on the PCB EXE and EXE This voltage must be approximately 3 1 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 3
8. Digital Voltmeter DVM Standard Electronics tool kit Grounding mat and clip Strain Gauge Simulator OV CoN Valor 7000 Series Service Manual 1 1 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 4 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 TABLE 1 1 SPECIFICATIONS Model V71P1502T V71P3T V71P6T V71P15T V71P30T R 1 5 kg 3 kg 6 kg 15 kg 30 kg Capacity 3 Ib 6 Ib 15 Ib 30 Ib 60 Ib 0 01kg 0 02kg 0 04kg 0 1kg 0 2kg Min 20e 0020 0 04lb 0 10 ER 0410 Standard readability 0 00005 kg 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg d 0 0001 Ib 0 0002 Ib 0 0005 Ib 0 001 Ib 0 002 Ib LFT ON readability 0 0005 kg 0 001 kg 0 002 kg 0 005 kg 0 01 kg e 10d 0 001 Ib 0 002 Ib 0 005 Ib 0 01 Ib 0 02 Ib Standard 1 30000 1 30000 1 30000 1 30000 1 30000 Resolution LFT ON f f Resolution nMax 1 3000 1 3000 1 3000 1 3000 1 3000 Linearity 2d 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg 0 002 kg Repeatability 2d 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg 0 002 kg Hysteresis 2d 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg 0 002 kg Off Center Load 2d 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg 0 002kg Creep 60s 2d 0 0001 kg
9. S End appears Z l Press YES to exit the Service menu and return to the weighing mode pos 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 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 Valor 7000 Series Service Manual B 3 Ohaus Corporation www ohaus com APPENDIX B SERVICE CALIBRATION B 7 Ramp Menu When AMF appears press YES to accept the Ramp menu or No DH to advance to the Expand menu item The Ramp value is displayed as a percent of the A D range Press YES to advance to the Expand menu item Note Ramp is used to troubleshoot load cell problems 0 represents no signal from the A D 100 reflects the upper signal to range of the A D B 8 Expand Menu When E DD appears press YES to accept the Expand menu or No to advance to the End menu item OFF disabled ON enabled Note Expand is required for various performance tests B 9 End Menu When appears press YES to return to exit the service menu or No to advance to the CAP menu Ohaus Corporation www ohaus com B 4 Valor 7000 Series Service Manual
10. of sum of Delta x Delta 9 5 Add the ten readings 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 6 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 Ohaus Corporation www ohaus com 4 4 Valor 7000 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 g 1500x0 05g 3000x0 1g 6000x0 2g 15000x0 5g 30000x 1g Reference Wt 500g 500g 1kg 2kg 5kg Load 1 200g 1000g 2kg 5kg 10kg Load 2 500g 1000g 1kg 5kg 10kg Load 3 200g 500g 2kg 2kg 5kg NOTE All masses are nominal values Use the same reference mass thr
11. 1 V71P15T 15kg 20kg 24 1 7 V71P30T 30kg 40kg 24 1 7 Figure 3 6 Gap position of corners A B C D A amp B represent the front of the scale Ohaus Corporation www ohaus com 3 6 Valor 7000 Series Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 7 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 Note Be careful not to short circuit the battery leads 2 Pull the quick connect tabs free of the battery posts and lift out the battery Figure 3 7 Rechargeable battery 3 Position the replacement battery in the compartment on an angle sufficient to access the battery posts 4 Insert the quick connect tabs on their respective posts and place the battery fully in the battery compartment 3 8 Replacing the Function Label The Function Label may need to be replaced See Chapter 5 for parts information 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 7000 Series Service Manual 3 7 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 4 1 TESTING Before and after servicing a Valor 7000 scale an operational test and various performance tests should be made to confirm that the scale meets spe
12. 4 5 Adjusting Off Center Load 4 4 5 Adjusting Off Center Load If the Off Center Load OCL is excessive perform adjustment as follows 1 Top view of Load Cell Fixed end 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 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 o coc n og o bh 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 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 7000 Series Service Manual CHAPTER 5 PARTS LISTS amp DIAGRAMS This section of the manual contains exploded views of the Valor 7000 scale The exploded view d
13. Repeatability Worksheet eene rne rne nnn 4 4 4 3 Linearity Test Masses c ET P aee ea 4 5 5 1 Housing amp Internal Parts 5 3 LIST OF ILLUSTRATIONS FIGURE NO TITLE 1 1 Front Display with Control 1 3 1 2 Back Display 1 4 1 3 LFT Lock Switch and Gel 1 6 2 1 Main Printed Curcuit Board 2 3 3 1 Screws securing Top Housing eene 3 2 3 2 Top and Bottom Bottom eene 3 2 3 3 Main Printed Circuit Board nene eene 3 3 3 4 Bolts holding Frame to the Load Cell 3 4 3 5 Overload Stops rann nutre teen ee ve re ee fet IY doe dde nde a e dea 3 5 3 6 Overload Gap positions eee nennen 3 6 3 7 Rechargeable Batter AANEREN 3 7 4 1 Scale drawing of Load Cell and Weighing 8 4 6 5 1 Housing amp Internal Parts 5 2 Valor 7000 Series Service Manual ii Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 14 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 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 Proced
14. See Appendix B for Service Calibration Ohaus Corporation www ohaus com 4 2 Valor 7000 Series Service Manual CHAPTER 4 TESTING 4 4 2 Repeatability Test Repeatability is the Standard Deviation of a set of similar weight readings Requirements To perform this test a single mass must be used for all readings The test mass should be approximately 75 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 Follow the steps in Appendix A Section A 2 Setup and Calibration Record Settings Zero Tracking Setting Displayed Units Mass Used TEST PROCEDURE 1 Zero the instrument if it does not read zero 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 7000 Series Service Manual 4 3 Ohaus Corporation www ohaus com CHAPTER 4 TESTING TABLE 4 2 REPEATABILITY WORKSHEET n Reading Delta Reading Mean Delta x Delta 1 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
15. TE 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 2 Be sure the scale is level and stable during the entire calibration process Allow the scale to warm up for approximately five minutes after stabilizing to room temperature To abort calibration press Exit key or turn the scale off anytime during the calibration process Before performing the calibration be sure to have the appropriate calibration weights as listed in table A 1 Ensure that the LFT switch calibration lock is set to unlocked position i Spano T Or adjust the GEO setting according to your location see instruction manual Table A 1 Suggested Span Calibration Mass sold separately Max Mass Max Mass 1500g 1 5kg 3lb 15000g 15kg 30 0 3000g 3kg 6lb 30000g 30kg 60lb 6000g 6kg 15 0 Valor 7000 Series Service Manual A 1 Ohaus Corporation www ohaus com APPENDIX A STANDARD CALIBRATION A 2 SETUP AND CALIBRATION Note Be sure units are set to kg before starting calibration 1 Turn on the scale Press and hold Menu until PENY Menu is PRENI displayed When the button is released the display will show C R t LRL 2 Press Yes to accept SPAR will then be shown Press Yes to begin the span calibration kg will be displayed n os 3 Press Yes to accept
16. alibration the PCB can be further checked using the Simulator to simulate various weight values If simulator settings and weight readings on the scale 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 7000 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 Cannot turn on No power to scale Verify connections and voltage Poor accuracy Improper calibration Unstable environment Perform calibration Move scale to suitable location Cannot calibrate LFT locked See chapter 5 for more information Cannot access mode Mode not enabled Enter menu and enable mode Cannot access unit Unit not enabled Enter menu and enable unit Battery icon flashing Low Battery error Connect the scale to AC power and charge the battery Weight reading exceeds Power On Zero Err Hi Power On Error limit Ere B2 Power On Error n reading below Power On Zero Err 8 3 Over Range Error Weight reading exceeds Overload limit Err B 4 Under Range Error Weight reading below Underload limit Err 8 5 Tare out of range Adjust tare value to be within range Err B6 Display overflow Weight exceeds 6 digits Err 9 5 Calibration data e
17. before you begin 1 Lift off the Weighing Pan 2 Turn the scale over Remove the eight screws holding the Housing in place See Figure 3 1 3 Move the top housing a little bit backward and then raise and remove the top housing 4 Separate Top Housing from Bottom Housing Avoid straining the cables that connect the Main PCB to the parts in the Bottom Housing Lay the two housings close to each other so cable is not strained Figure 3 1 Screws marked with white circles that secure the housing Display PCB Main PCB Load Cell Frame Load Cell Cable leads Figure 3 2 Top and Bottom Housings Ohaus Corporation www ohaus com 3 2 Valor 7000 Series Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 4 Removing Replacing the Main PCB and Display PCB If the PCBs are suspected of being faulty they should be replaced as follows 1 Disconnect the Cable connecting the Main PCB to the scale s power system See Figure 3 2 Remove the four screws that secure the PCB to the bottom housing If either the Main PCB or the Load Cell is to be replaced note the order of the wire colors and then disconnect the Load Cell Cable from the Main PCB See Figure 3 2 Position the replacement PCB as in Figure 3 2 insert and tighten the screws Re connect the Load Cell Cables to the PCB in the same position as originally installed 6 Re connect the Cable connecting the Main PCB to the scale s power
18. cifications Turn the scale on and allow it to warm up for at least one hour before performing these tests NOTE 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 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 Model Weight g V71P1502T 1kg 500g 200g V71P3T 1kg 500g V71P6T 2kg 1kg 500g V71P15T 10kg 5kg 2kg V71P30T 10kg 5kg 4 2 Operational Test 1 Connect a functioning Power cord to the back 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 and followed by a software revision number Valor 7000 Series Service Manual 4 1 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 4 4 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 NOTE The following performance tests are used to eva
19. e local weights and measures regulations 2 Perform a calibration see instruction manual 3 Set the switch to Locked See figure 1 3 1 6 2 Verification The local weights and measures official or authorized service agent must perform the verification procedure 1 6 3 Sealing 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 Lock Switch Paper Seal Wire Seal eee Unlocked Locked with Paper Seal Locked with Wire Seal Ohaus Corporation www ohaus com 1 6 Valor 7000 Series Service Manual CHAPTER 1 GETTING STARTED Figure 1 3 Sealing Valor 7000 Series Service Manual 1 7 Ohaus Corporation www ohaus com 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 4 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 4 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 manua
20. esent a flashing display Note The default setting is 3 Press YES to accept the setting and move to the Service Grad menu item Press NO to enter another value using the numeric keypad and then press YES to store the new value BA Graduation Menu When GrRd appears press YES to accept the Graduation menu or No to advance to the Service Span Calibration menu Set the graduation of the scale 0 00005 0 02 B 5 Service Span Calibration When SPAR 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 point Outlined characters represent a flashing display E flashes while the zero point is established Service Span Calibration point flashes The example shows the value for a Scale Capacity of 3 kg Place the specified calibration weight on the pan and press Yes E 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 0 09 Ohaus Corporation www ohaus com B 2 Valor 7000 Series Service Manual 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 sca
21. esting the Printed Circuit Board DCH 2 4 2 2 4 Diagnostic Gudene aan ht gei 2 6 CHAPTER 3 MAINTENANCE PROCEDURES 3 1 Preventive Maintenance 3 1 3 1 1 Preventive Maintenance Checklist ssssssssssee 3 1 3 2 Service Girategy eene nennen nnne nennen enne 3 1 3 3 Opening the Scale eee eerte bee ri ra e dst e Eee denda 3 1 3 2 1 Separating the Top and Bottom 3 2 3 4 Removing Replacing the Main Printed Circuit Board 3 3 3 5 Removing Replacing the Load Cell 3 4 3 6 Setting the Overload Stops nennen 3 5 3 7 Removing Replacing the Rechargeable Battery ssssssssssssseee 3 7 3 8 Replacing the Function Label 3 7 CHAPTER 4 TESTING 4 4 1 1 Test Masses Required AA 4 1 4 2 Operational Test 4 1 4 3 Segment Display Test 4 1 4 4 Performance Tests 4 2 4 4 Precision TESE ied ttti esa b ire dir deis 4 2 4 4 2 Repeatability Test 4 3 44 3 Lnearnty Testine em 4 5 4 4 4 Off Center Load Test 4 5 4 4 5 Adjusting Off Center Load sss ener enne 4 6 Ohaus Corporation www ohaus com i Valor 7000 Series Service Manual TABLE OF CONTENTS CHAPTER 5 DRAWINGS AND PARTS LISTS 5 1 Valor 7000 Scale Housing amp Internal 8 5
22. ized 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 Dispose of the lead acid battery according to local laws and regulations Ohaus Corporation www ohaus com 1 4 Valor 7000 Series Service Manual 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 TABLE 1 4 Valor 7000 MENU STRUCTURE Menu C A L S E LU P r E A d M O d E gt Span Reset Reset Reset Lin Pwr Un Stable Weigh Menu GEO Zero Filter Percnt Items End A Tare AZT Check Bp Sig Light End Bp Key A Off IR Func End IR Adj Accum End gt U n i t P r i n t C O M L O C k E n d Reset Reset Reset L Cal kg Stable Baud L Setup Menu g A Print Parity L Read Items Ib Contnt Stop L Mode Layout Handsh L Unit Ib oz Data Tr Alt Cm L Print End End End L COM End 1 5 4 Menu Navigation Press and hold Menu until MENY Menu is displayed When released the first sub menu A L Cal will be shown Summary of button navigation functions in menu mode Yes Allows entry into the displayed menu Accepts the displayed setting and advances to the next item No Skips by the displayed menu Reject
23. l to be familiar with the balance components and operation 2 2 1 Diagnosis 1 Isolate and identify the symptom 2 Refer to Table 2 4 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 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 7000 Series Service Manual 2 1 Ohaus Corporation www ohaus com CHAPTER 2 DIAGNOSTIC GUIDE 2 2 2 Checking Load Cells for Trouble 1 Perform a Resistance Test to determine if the Load Cell is severely damaged or a short circuit to the frame has occurred 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
24. le 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 L appears press YES to accept the Service Linearity Calibration menu or No to advance to the Ramp menu item 0 flashes The kg LED is lit to indicate the calibration unit e With no weight on the pan press Yes to establish the zero point D Outlined characters represent a flashing display E flashes while the zero point is established m The mid calibration point value flashes The kg LED is lit to indicate the calibration unit The example shows the mid calibration point value for a 0 2 Scale Capacity of 3 kg Place the specified calibration weight on the pan and press Yes flashes while the mid point is established ee The full calibration point value flashes The kg LED is lit to indicate the d calibration unit The example shows the full calibration point value for a E Scale Capacity of 3 kg Place the specified calibration weight on the pan and press Yes flashes while the full point is established E If linearity calibration was successful the scale will exit the service menu zwi and enter weighing mode 4 The example shows a 3 kg span weight on the pan If linearity calibration was successful
25. luate 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 1 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 Deviation of a set of similar weight readings which should match the specification for each model listed in Table 1 1 1 2 Power on the balance The reading on the display should be 0g 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 Remove the mass The reading should return to Og 2 count Repeat this test three times The reading should be within 2 count of the reading recorded If so the balance passes the Precision Test If the deviation for any set of readings using the same mass placed on the center of the Pan is greater than 2 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
26. mulator The simulator replaces the Load Cell during testing and is a useful tool for diagnosing problems PCB Voltage Measurements Note 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 CAUTION Disconnect the power from the scale before opening the housing 2 Connect the AC Adapter to the scale and turn the scale on Using a DVM measure the excitation voltage EXE and EXE in Figure 2 1 The reading should be 3 1 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 transformer connector shown in Figure 2 1 The voltage should read 0 volts with power off and above 12 Volts dc with power on 5 Perform simulator testing 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 3 1 Volt excitation voltage applied Ohaus Corporation www ohaus com 2 4 Valor 7000 Series Service Manual CHAPTER 2 DIAGNOSTIC GUIDE General Load Test This test checks the Main PC Board circui
27. oughout the procedure NU eg 9 Place the test mass on the Scale record the weight and remove Place Load 1 on the Scale and press ON Zero Off Place the test mass on the Scale record the weight and remove Place Load 2 on the Scale and press ON Zero Off Place the test mass on the Scale record the weight and remove Place Load 3 on the Scale and press ON Zero Off Place the test mass on the Scale and record the weight The difference in the weights of the test mass should be within 2 d as specified in the Tables 1 1 and 1 2 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 Valor 7000 Series Service Manual 4 5 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 5 Maximum allowable change in displayed weight readings for each of the four positions can be found in Tables 1 1 Specifications page 1 2 If this maximum is exceeded follow procedures in Section 4
28. r 7000 Series Service Manual CHAPTER 3 MAINTENANCE PROCEDURES TABLE 3 1 MOUNTING BOLT TORQUE SETTINGS MODEL TORQUE SETTING V71P1501T V71P3T SS V71P6T SIMI AN V71P15T V71P30T SES 6 Set Overload Stops as shown in Section 3 6 3 6 Setting the Overload Stops The Overload Stop gaps must be checked and reset if the Load Cell is replaced This procedure requires test masses equal to the scale s capacity See Table 3 2 There are four Overload Stop Bolts See Figure 3 5 Adjust the Overload Stops per Table 3 2 1 Adjust the Overload Stop Bolt so that the gap between the Load Cell Frame and the Overload Stop Nut is equal to the specification in Table 3 2 The gap can be tested by applying 100 load one corner at a time at each corner stop If the gap is right the Load Cell Frame will just touch the Overload Stop Nut Overload Stops o gt Note Be careful not to overload the Figure 3 5 Overload Stops 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 3 5 Ohaus Corporation www ohaus com 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 3kg 0 6 0 5 V71P3T 3kg 5kg 0 8 0 7 V71P6T 6kg 10kg 1 5 1
29. rawings 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 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 www ohaus com Ohaus Corporation 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 7000 Series Service Manual 5 1 Ohaus Corporation www ohaus com CHAPTER 5 PARTS LISTS amp DIAGRAMS Valor 7000 SCALES PARTS 5 1 E e CCG OC mc 1 Valor 7000 Scales Parts Figure 5 Valor 7000 Series Service Manual 5 2 Ohaus Corporation www ohaus com CHAPTER 5 PARTS LISTS amp DIAGRAMS TABLE 5 1 Valor 7000 SCALES PARTS Drawing Item Part Number Description 1 30037417 Pan Plastic R31 RC31 V71 2 30037395 Housing Top V71 30025998 Function Label Rear EN V71 3 30060923 Function Label Rear JP V71 30037467 Function Label Rear KR V71 30025997 Function Label Front EN V71 4 30060922 Function Label Front JP V71 30037466 Function Label Front KR V71 5 30037434 Spider Upper
30. rror X Calibration data not present T Busy Displayed during tare setting zero setting printing fg Action not allowed Function not executed Calibration error Calibration value outside allowed limits Unstable environment CAL E e Move the scale to suitable location Incorrect calibration Use correct calibration weight weight EWENI Increase reference weight Lo r EF warning 9 Reference weight too small Weight on EFE Unacceptable reference the pan is too small to define a valid r err weight reference weight Increase reference weight Battery fails to charge fully Battery is defective Have battery replaced by Ohaus authorized service dealer Ohaus Corporation www ohaus com 2 6 Valor 7000 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 u
31. s the displayed setting or menu item and advances to the next available item Back Moves backwards through the upper and middle level menus Backs out of a list of selectable items to the previous middle level menu Exit Exits from menu directly to the active weighing mode Valor 7000 Series Service Manual Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 6 LEGAL FOR TRADE When the scale is used in trade or a legally controlled application it must be set up verified and sealed in accordance with local weights and measures regulations It is the responsibility of the purchaser to ensure that all pertinent legal requirements are met The Menu Lock switch limits changes to the Cal Setup Readout Unit and Print menus The switch in type approved models may set some scale settings as required by the approval agency The switch may be secured using paper or wire seals Note When LEGAL FOR TRADE is set to ON LFT Switch in locked position the menu settings are affected as follows Calibration R L menu is not accessible Zero Range is locked at 296 Stable Range setting is locked at 1d Auto Zero Tracking setting is locked at 0 5d Units are locked at their current settings Filter is locked at current setting Stable Only is locked On Auto Print Continuous is disabled Lb oz is locked Off 1 6 1 Settings Before verification and sealing perform the following steps 1 Verify that the menu settings meet th
32. sing the scale After temperature stabilization allow another 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 the area beneath the Pan 2 Clean the outside of the scale using a damp cloth with warm water CAUTION 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 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 3 3 OPENING THE SCALE Use these procedures in order to replace the Load Cell any of the Printed Circuit Boards and or LCD Displays Valor 7000 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 7000 scales Turn the scale off and unplug the power cord
33. 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 3 3 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES 3 5 Removing Replacing the Load Cell A Load Cell that is even slightly bent or corroded should be replaced The Load Cell may also need to be replaced because of instability or because the scale does not calibrate or repeat Note The Load Cell is sold separately See Chapter 5 1 Unplug the cable leads connecting the Load Cell to the PCB See Figure 3 2 2 Turn the scale over and remove the bolts and washers that hold the Load Cell assembly frame and load cell to the Bottom Housing Remove the bolts and their washer pairs that hold the Load Cell Frame to the Load Cell Use a high leverage Allen wrench 3 Liftthe Load Cell away from the frame S0 AN Figure 3 4 Remove the bolts holding Frame to the Load Cell 4 When installing the replacement Load Cell first secure the bottom frame to the load cell with the screws and then secure the top frame to the load cell Adjust the down up stop gaps 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 3 4 Valo
34. trols TABLE 1 2 Control functions Valor 7000 Button Functions On Zero Short Press when on Sets display to zero when off Turns scale on Off Long Press when on Turns the scale off Yes Short Press in Menu Selects accepts displayed setting Print Short Press See Interface Manual for operation description Units Long Press Toggles through active weighing units No Short Press in Menu Toggles through available settings Function Short Press Selects function setting Mode Long Press Selects active Mode Back Short Press in Menu returns to previous settings M Short Press Accumulates the weight and displays the accumulated information at 0 load Menu Long Press Enters User Menu Exit Short Press in Menu Quickly exit User Menu Tare Short Press Enter clear a tare value Clears the accumulation when the accumulation information is displayed The IR Sensor can be programmed to act as touchless buttons See section 4 3 for the available settings Notes Short Press Press less than 1 seconds Long Press Press and hold for more than 2 seconds Press and hold the Off button until OFF is displayed then release the button Valor 7000 Series Service Manual Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED NET gt D e SH CHCHCHCH CIS Ll CT EU E 7 V v v v v v A m A e T IR Sensor back LED Indicators Fig
35. try by simulating accurate Load Cell voltages at zero load 50 and 100 load capacities Disconnect power from the scale and remove the Top housing See Section 3 3 1 Leave the Mechanical 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 c
36. ure 1 2 Valor 7000 Back Display 1 5 2 Power ON OFF To turn the scale on press and hold the On Zero Off button for 1 second The scale performs a display test momentarily displays the software version and then enters the active weighing mode To turn the scale off press and hold the On Zero Off button until OFF is displayed The scale can be used on AC power immediately Allow the battery to charge for 12 hours before using the scale on battery power The Scale will automatically switch to battery operation if there is a power failure or the power cord is removed With AC power the scale is constantly charging so the battery charge indicator see item 11 in figure 3 2 will remain lit The scale can be operated during charging and the battery is protected against overcharging For maximum operating time the battery should be charged at room temperature During battery operation the battery symbol indicates the battery charge level remaining The indicator will automatically turn off when the batteries are fully charged TABLE 1 3 Symbol Charge level CH 0 to 10 Remaining IS 11 to 40 Remaining nm 41 to 70 Remaining aan 71 to 100 Remaining Notes When battery symbol blinks fast approximately 30 minutes working time is left When Lo bRE 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 author
37. ures Contains preventive maintenance procedures and disassembly repair and replacement procedures Chapter 4 Testing Contains a list of required test masses an operational test segment display test performance tests and adjustments Chapter 5 Drawings and Parts Lists Contains exploded views of Valor 7000 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 Area must be clean and free of excessive dust Work surface must be stable and level Scale must not be exposed to direct sunlight or radiating heat sources Use an approved Electro Static Device 1 3 TOOLS AND TEST EQUIPMENT REQUIRED The service shop should contain the following equipment Standard hand tools
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