1. DL manuals
  2. OHAUS
  3. Scales
  4. CS 2000
  5. Service Manual

OHAUS CS 2000 Service Manual - Service Manual

Manual is about: Compact Scales

Summary of CS 2000

  • Page 1

    Service manual valor ™ 2000 scales ohaus corporation, 7 campus drive, suite 310, parsippany, nj 07054 (973) 377-9000

  • Page 3: Service Manual

    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...

  • Page 5

    Table of contents ohaus corporation www.Ohaus.Com i valor ™ 2000 series service manual page no. Chapter 1 getting started 1.1 introduction ..............................................................................................................1-1 1.2 service facilities ...........................

  • Page 6

    Table of contents valor ™ 2000 series service manual ii ohaus corporation www.Ohaus.Com page no. Chapter 5 drawings and parts lists 5-1 valor 2000 scales: housing & internal parts ............................................................5-2 appendix a standard calibration a.1 calibration ...........

  • Page 7

    Chapter 1 getting started valor ™ 2000 series service manual 1-1 ohaus corporation www.Ohaus.Com 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 a...

  • Page 8

    Chapter 1 getting started ohaus corporation www.Ohaus.Com 1-2 valor ™ 2000 series service manual 1.3 tools and test equipment required the service shop should contain the following equipment: 1. Standard hand tools. 2. Digital voltmeter (dvm). 3. Standard electronics tool kit. 4. Grounding mat and c...

  • Page 9

    Chapter 1 getting started valor ™ 2000 series service manual 1-3 ohaus corporation www.Ohaus.Com 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 t...

  • Page 10

    Chapter 1 getting started ohaus corporation www.Ohaus.Com 1-4 valor ™ 2000 series service manual 1.5 scale operation this section contains information on the basic operation of the scale. 1.5.1 overview of the controls figure 1-1. Valor 2000 front display: with controls. (the display and leds are du...

  • Page 11

    Chapter 1 getting started valor ™ 2000 series service manual 1-5 ohaus corporation www.Ohaus.Com 1.5.2 power on with power applied, press on/ >o/toff. 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...

  • Page 12

    Chapter 1 getting started ohaus corporation www.Ohaus.Com 1-6 valor ™ 2000 series service manual 1.5.4 menu setup 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 o...

  • Page 13

    Chapter 1 getting started valor ™ 2000 series service manual 1-7 ohaus corporation www.Ohaus.Com 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 ...

  • Page 14

    Chapter 1 getting started ohaus corporation www.Ohaus.Com 1-8 valor ™ 2000 series service manual.

  • Page 15

    Chapter 2 diagnostic guide valor ™ 2000 series service manual 2-1 ohaus corporation www.Ohaus.Com 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 b...

  • Page 16

    Chapter 2 diagnostic guide ohaus corporation www.Ohaus.Com 2-2 valor ™ 2000 series service manual 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. (see chapter 4 for details.) note: the...

  • Page 17

    Chapter 2 diagnostic guide valor ™ 2000 series service manual 2-3 ohaus corporation www.Ohaus.Com 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...

  • Page 18

    Chapter 2 diagnostic guide ohaus corporation www.Ohaus.Com 2-4 valor ™ 2000 series service manual 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 diagnosin...

  • Page 19

    Chapter 2 diagnostic guide valor ™ 2000 series service manual 2-5 ohaus corporation www.Ohaus.Com 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 ce...

  • Page 20

    Chapter 2 diagnostic guide ohaus corporation www.Ohaus.Com 2-6 valor ™ 2000 series service manual 2.2.4 diagnostic guide table 2-4. Diagnostic guide symptom possible cause remedy unstable weight air flow may be blocked to scale because rear feet are tightened completely. Adjust rear feet at least sl...

  • Page 21

    Chapter 3 maintenance procedures valor ™ 2000 series service manual 3-1 ohaus corporation www.Ohaus.Com 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 step...

  • Page 22

    Chapter 3 maintenance procedures ohaus corporation www.Ohaus.Com 3-2 valor ™ 2000 series service manual 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 w...

  • Page 23

    Chapter 3 maintenance procedures valor ™ 2000 series service manual 3-3 ohaus corporation www.Ohaus.Com 3.3.2 removing the component covers and lifting out the cable plugs figure 3-4. Top and bottom housings with some plugs removed. 1. Remove the screws that secure the cables to the housing, to avoi...

  • Page 24

    Chapter 3 maintenance procedures ohaus corporation www.Ohaus.Com 3-4 valor ™ 2000 series service manual 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. Pull the white c...

  • Page 25

    Chapter 3 maintenance procedures valor ™ 2000 series service manual 3-5 ohaus corporation www.Ohaus.Com 3.7 removing/replacing the power supply pcb the valor 2000’s power supply is located in the power pcb housing. To replace it: 1. Remove the four screws in its cover. 2. Lift the cover as much as p...

  • Page 26

    Chapter 3 maintenance procedures ohaus corporation www.Ohaus.Com 3-6 valor ™ 2000 series service manual 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 t...

  • Page 27

    Chapter 3 maintenance procedures valor ™ 2000 series service manual 3-7 ohaus corporation www.Ohaus.Com 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 re...

  • Page 28

    Chapter 3 maintenance procedures ohaus corporation www.Ohaus.Com 3-8 valor ™ 2000 series service manual.

  • Page 29

    Chapter 4 testing valor ™ 2000 series service manual 4-1 ohaus corporation www.Ohaus.Com 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 ...

  • Page 30

    Chapter 4 testing ohaus corporation www.Ohaus.Com 4-2 valor ™ 2000 series service manual 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....

  • Page 31

    Chapter 4 testing valor ™ 2000 series service manual 4-3 ohaus corporation www.Ohaus.Com 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 a...

  • Page 32

    Chapter 4 testing ohaus corporation www.Ohaus.Com 4-4 valor ™ 2000 series service manual 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 d...

  • Page 33

    Chapter 4 testing valor ™ 2000 series service manual 4-5 ohaus corporation www.Ohaus.Com 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 note: the scale must pass the precision an...

  • Page 34

    Chapter 4 testing ohaus corporation www.Ohaus.Com 4-6 valor ™ 2000 series service manual 4.4.5 adjusting off center load if the off center load (ocl) is excessive, perform adjustment as follows: figure 4-2. Scale drawing of valor 2000 load cell and weighing pan. 1. Place the test weight in the cente...

  • Page 35

    Chapter 5 parts lists & diagrams valor ™ 2000 series service manual 5-1 ohaus corporation www.Ohaus.Com 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 scale in the field. Note: in...

  • Page 36

    Chapter 5 parts lists & diagrams ohaus corporation www.Ohaus.Com 5-2 valor ™ 2000 series service manual 5.1 valor 2000 scales: housing & internal parts 1 2 3 12 9 6 80 10 13 3 11 16 17 7 18 3 15 14 3 5 8 4 16 figure 5-1. Valor 2000 scales: housing & internal parts..

  • Page 37

    Chapter 5 parts lists & diagrams valor ™ 2000 series service manual 5-3 ohaus corporation www.Ohaus.Com 5.1 valor 2000 scales: housing & internal parts table 5-1. Valor 2000 scales: housing & internal parts drawing item description 1 pan 2 pan support 3 gasket kit: main gasket, load cell seal gasket...

  • Page 38

    Chapter 5 parts lists & diagrams ohaus corporation www.Ohaus.Com 5-4 valor ™ 2000 series service manual.

  • Page 39

    Appendix a standard calibration valor ™ 2000 series service manual a-1 ohaus corporation www.Ohaus.Com 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. ...

  • Page 40

    Appendix a standard calibration ohaus corporation www.Ohaus.Com a-2 valor ™ 2000 series service manual a.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 i...

  • Page 41

    Appendix a standard calibration valor ™ 2000 series service manual a-3 ohaus corporation www.Ohaus.Com 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 ca...

  • Page 42

    Appendix a standard calibration ohaus corporation www.Ohaus.Com a-4 valor ™ 2000 series service manual.

  • Page 43

    Appendix b service calibration valor ™ 2000 series service manual b-1 ohaus corporation www.Ohaus.Com 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)...

  • Page 44

    Appendix b service calibration ohaus corporation www.Ohaus.Com b-2 valor ™ 2000 series service manual 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. S.Unit when s.Unit appears and the kg led is lit, pr...

  • Page 45

    Appendix b service calibration valor ™ 2000 series service manual b-3 ohaus corporation www.Ohaus.Com b.5 service span calibration when s.Cal appears, press yes to accept the service calibration menu, or no to advance to the end sub-menu selection. S.Cal when s.Span appears, press yes to accept the ...

  • Page 46

    Appendix b service calibration ohaus corporation www.Ohaus.Com b-4 valor ™ 2000 series service manual 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 wei...

  • Page 48

    *80252589* p/n 80252589b service manual: valor 2000 series scales.