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OHAUS Valor 1000 Service Manual
Summary of Valor 1000
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Service manual valor ™ 1000 scales ohaus corporation 19a chapin road, p.O. Box 2033, pine brook, nj 07058-2033 (973) 377-9000
Page 3: Service Manual
Service manual valor ™ 1000 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...
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Table of contents page no. Chapter 1 getting started 1.1 introduction ................................................................................................................1-1 1.2 service facilities...............................................................................................
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Table of contents list of tables table no. Title page no. 1-1 specifications (standard models)..........................................................................1-2 1-2 specifications (ntep models)...............................................................................1-3 1-3 functions...
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Chapter 1 getting started 1.1 introduction this service manual contains the information needed to perform routine maintenance and service on the ohaus valor 1000 series scales. Familiarity with the scale’s instruction manual is assumed. The contents of this manual are contained in five chapters: cha...
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Chapter 1 getting started 1.3 tools and test equipment required 1. Common hand tools 2. Standard electronics tool kit 3. Digital voltmeter (dvm) capable of reading from 1 mv to 50 v dc.) 1.4 specifications complete specifications for the ohaus valor 1000 scales are listed in table 1-2. When a scale ...
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Chapter 1 getting started 1.5 scale operation this section contains information on the basic operation of the scale. Units of measure indicators: pieces (not used), pounds, ounces, kilograms 1.5.1 overview of the controls 7-segment, 6-digit backlit lcd low battery indicator battery charge indicator ...
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Chapter 1 getting started 1.6 how load cells operate load cells are devices that convert force into a signal. The valor 1000 has a strain gauge load cell, which is made from a metal beam with holes drilled in it. Strain gauges are affixed to the beam at the top and bottom to measure changes in the b...
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Chapter 1 getting started 1.6 how load cells operate the difference in the output signal before and after the mass was placed on the platform is taken, interpreted and displayed. Figure 1-4. Route of electrical load cell input and output through wheatstone bridge circuit. A load cell is a force sens...
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Chapter 1 getting started ohaus corporation www.Ohaus.Com 1-6 valor™ 1000 series service manual.
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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 scale componen...
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Chapter 2 diagnostic guide 2.2.2 checking load cells for trouble 2. 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 boa...
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Chapter 2 diagnostic guide 2.2.2 checking load cells for trouble figure 2-1. Load cell wire connections to main pcb. Caution: in the next step, do not overload the scale beyond full capacity rating. – measure the voltages on +sig and –sig wires, disconnected from pcb (points 1 and 2 in figure 4-2). ...
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Chapter 2 diagnostic guide 2.2.3 diagnostic guide table 2-4. Diagnostic guide symptom possible cause remedy scale will not turn on. No power to scale battery power exhausted adapter defective input connector at rear of balance may be defective on/off switch defective or actuating fingers on top hous...
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Chapter 2 diagnostic guide 2.2.3 diagnostic guide symptom possible cause remedy scale flashes bat battery discharged connect power and charge battery. Battery fails to charge fully battery is defective replace battery. -----h overload during power on remove weight from pan and re-zero. Calibrate ---...
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Chapter 2 diagnostic guide ohaus corporation www.Ohaus.Com 2-6 valor™ 1000 series service manual.
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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 exter...
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Chapter 3 maintenance procedures 3.3.1 separating the top and bottom housings common hand tools are sufficient to disassemble the valor 1000 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. 3. Turn th...
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Chapter 3 maintenance procedures 3.4 removing/replacing the main pcb and switches 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.) 2. Remove the four screws that secure e...
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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 supplied as an ass...
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Chapter 3 maintenance procedures 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 with jam nuts. (see figure 3-4.) adjus...
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Chapter 3 maintenance procedures 3.7 removing/replacing the rechargeable battery the valor 1000 has a rechargeable battery. If it fails to recharge, replace it as follows: 1. Remove the four screws in its cover, and lift off the cover. 2. Lift the battery’s front end enough to access the quick-conne...
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Chapter 4 testing 4.1 testing before and after servicing a valor 1000 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: make sure...
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Chapter 4 testing 4.4 performance tests accurate performance of the valor 1000 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 sh...
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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 ½ of the capacity of the instrument. – wear gloves when ha...
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Chapter 4 testing 4.4.2 repeatability test 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 of (sum of (delta x delta) / 9) 5. Add the ten r...
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Chapter 4 testing 4.6.3 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 note: the scale must pass the precision and repeatability tests, and be calibrated before the linearity test may ...
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Chapter 4 testing 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 2 3 weighing pan’s center, with points a – d indicated 1 4 figure 4-2. Scale drawing of valor 1000 load cell and weighing pan. 1. P...
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Chapter 5 parts lists & diagrams this section of the manual contains exploded views of the valor 1000 scales. The exploded view drawings are designed to identify the parts which can be serviced on the scale in the field. Note: in all cases where a part is replaced, the scale must be thoroughly check...
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Chapter 5 parts lists & diagrams 5.1 valor 1000 scales: housing & internal parts 11 80 17 10 9 8 6 3 2 1 20 4 5 7 16 14 20 20 20 20 figure 5-1. Valor 1000 scales: housing & internal parts. Ohaus corporation www.Ohaus.Com 5-2 valor™ 1000 series service manual.
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Chapter 5 parts lists & diagrams 5.1 valor 1000 scales: housing & internal parts table 5-1. Valor 1000 scales: housing & internal parts drawing item description 1 pan 2 pan support 3 function label 4 top housing 5 back overlay 6 pcb set: main and switches 7 frame 8 load cell 9 level bubble 10 bottom...
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Chapter 5 parts lists & diagrams ohaus corporation www.Ohaus.Com 5-4 valor™ 1000 series service manual.
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Appendix a standard calibration appendix a. Standard calibration a.1 calibration standard calibration should be performed prior to using a scale, and after service. A 3kg mass is required to perform span calibration on all models. Note: be careful not to touch the scale or the table while calibratio...
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Appendix a standard calibration a.2 setup and calibration table a-1. Initial configuration settings for each model model division (a----x) decimal point (b----x) capacity (c-----x) zero tracking (d----x) calibration weight v11p3 0.5g: x=5 kg: x=4 or g: x=1 3.0000kg or 3000.0g x=3 3.000 v11p6 1g: x=1...
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*80252599* p/n 80252599 service manual: valor 1000 series scales.