OHAUS NV212 Service Manual
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OHAUS NV212 Service Manual

Navigator series
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SERVICE MANUAL
Navigator
Series Scales

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  • Page 1 SERVICE MANUAL Navigator Series Scales...

  • Page 3: Table Of Contents

    5 PARTS LISTS & DIAGRAMS 5.1 HOUSING & INTERNAL PARTS APPENDIX A. STANDARD CALIBRATION A.1 SPAN CALIBRATION A.2 LINEARITY CALIBRATION APPENDIX B. SERVICE MENU B.1 ENTERING THE SERVICE MENU B.2 RAMP B.3 LINEAR CALIBRATION Ohaus Corporation www.ohaus.com Navigator Series Service Manual...
  • Page 4 B.9 EXPANDED RESOLUTION (E.PAnd) B.10 RESET B.11 END APPENDIX C. SOFTWARE SERVICE TOOL INSTRUCTIONS C.1 HARDWARE AND SOFTWARE SETUP C.2 DEFINING LED DISPLAY VERSION C.3 CONFIGURING THE SCALE APPENDIX D. GEOGRAPHICAL ADJUSTMENT VALUES Navigator Series Service Manual Ohaus Corporation www.ohaus.com...
  • Page 5 Navigator NVL and NVT: Housing & Internal Parts ..........35 First screen of the Navigator Service Tool ............45 Com port Configuration screen ................46 Diagnostic screen ....................46 Model name on Data Label .................. 47 Model name entered .................... 47 Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 7: Getting Started

    1.1 INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus Navigator 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, specifications, and the mechanical and electronic functions of the scale.

  • Page 8: Specifications

    2. RS2323 Interface Kit – PN 83032106 or 71147376 1.4 SPECIFICATIONS Specifications for the Ohaus Navigator Scales are listed in Table 1-1. When a scale has been serviced, it must meet the specifications listed in the table. Before servicing the scale, determine what specifications are not met.
  • Page 9 1e / 5° C 1e / 5° C 1e / 5° C 1e / 5° C 1e / 5° C Span Sensitivity 1 MPE 1 MPE 1 MPE 1 MPE 1 MPE 1 MPE Navigator Series Service Manual Ohaus Corporation www.ohaus.com...
  • Page 10 1 MPE 1 MPE 1 MPE Zero Drift 1e / 5° C 1e / 5° C 1e / 5° C 1e / 5° C Span Sensitivity 1 MPE 1 MPE 1 MPE 1 MPE Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 11: Capacity And Readability

    CHAPTER 1 GETTING STARTED 1.5 CAPACITY AND READABILITY The capacity and readability of the available units of measure for the Ohaus Navigator Scales are listed in Table 1-2. TABLE 1-2 CAPACITY AND READABILITY NV Models (Non-Approved) Units NV212 NV511 NV1101...
  • Page 12 15500 x 0.5 3100 x 0.1 x 0.001 6.835 x 0.005 10.935 109.35 x 0.005 x 0.05 9.965 99.65 x 0.005 x 0.05 4784 47840 gr / x 20 199.3 1993 x 0.1 Ohaus Corporation www.ohaus.com Navigator Series Service Manual...
  • Page 13 1714.67 tola x 0.01 x 0.01 x 0.01 x 0.05 x 0.05 x 0.1 31.23 67.36 128.6 312.30 612.40 1224.79 tical x 0.01 x 0.01 x 0.01 x 0.05 x 0.05 x 0.1 Navigator Series Service Manual Ohaus Corporation www.ohaus.com...
  • Page 14 0.05 137.17 274.34 548.7 857.35 1371.7 tola x 0.01 x 0.02 x 0.05 x 0.05 x 0.1 97.98 195.96 391.95 612.40 979.8 tical x 0.01 x 0.02 x 0.05 x 0.05 x 0.1 Ohaus Corporation www.ohaus.com Navigator Series Service Manual...
  • Page 15 0.2 466.66 93.35 233.3 466.6 x .02 x 0.05 x 0.1 x 0.2 22400 44800 112000 224000 gr / x 10 x 20 x 50 x 100 933.5 1867 4666 9335 x .5 Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 16: Scale Operation

    The included AC adapter may be used to power the scale when battery power is not available. Figure 1-1. Power Connection 1.6.1 Overview of the Controls Figure 1-2. Navigator (non-approved models) Overlay Figure 1-2. Navigator (approved models) Overlay Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 17: Functions Of Display Controls

    IR Sensors can be programmed to act as “touchless” buttons. IR Sensor-Left IR Sensor-Right They can be programmed to perform the Tare, Function, Print and Zero functions or be disabled. Each sensor is programmed individually. Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 18: Display Indicators

    High, Accept, Low indicators for check weigh mode. 1.6.3 Power On . After segment display, “OHAUS” With power connected, AC Adapter or battery, press Zero/ and software revision number, the display will show * 0.00 and the current unit (standard weighing mode).

  • Page 19: Power Off

    Appendix D. Possible values are from 1 to 31.) The setting is in the Service Menu: press ZERO and Tare simultaneously during power on, hold until “Ramp” is seen. Press No three times until GEO appears, then press Yes. Then continuously press No until the desired Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 20: Navigator User Menu Structure

    The Service Menu is intended for use by service personnel. The menu items are generally used when servicing the scale but there are setting that may be changed to satisfy a customer’s special requirements. For more detail on using the service menu see Appendix B. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 21: Navigator Service Menu Structure

    CHAPTER 1 GETTING STARTED TABLE 1-6 NAVIGATOR SERVICE MENU STRUCTURE Service Menu Ramp Span Filter Menu Items: Stability Expand Reset Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 22: Diagnostic Guide

    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. Ohaus Corporation www.ohaus.com...
  • Page 23 Scale menu settings not proper RS232, USB or See Interface User Manual for proper Connected computer settings are Ethernet settings not correct. interface not working Poor Cable connection Check cable connection Navigator Series Service Manual Ohaus Corporation www.ohaus.com...
  • Page 24 4. New tare is established --- Perform tare if load <=Max; Err 8.6 999999 Displayed value >999999 Result exceeds display capability. Contact Ohaus or an authorized service Err 9 Data Internal data error. agent Contact Ohaus or an authorized service Err 13 mMEmM Fail to write EEPROM.

  • Page 25: Maintenance Procedures

    CHAPTER 3 MAINTENANCE PROCEDURES 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.
  • Page 26 Remove the 5 screws holding the Top and Bottom Housings in place. (See Figure 3-2.) Screws that secure the housings (Note: NV model shown) Figure 3-2 Separating the Top and Bottom Housings Turn the scale over and remove the upper housing. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 27: Load Cell Wire Color Identification

    J3 has 5 solder pads with the following connections (left to right); Shield, -EXE, -SIG, +SIG, +EXE. TABLE 3-1. Load Cell Wire Color Identification Spare Part Load Cell Wire Color Identification Load cell,NV212 Shield Bare wire with sleeve Load cell,NV311...
  • Page 28 Figure 3-4. Position jack Route wires Position PCB on locating Pins Figure 3-4 Position load cell, PCB and AC wires 5. To assemble the Housing, follow the steps in Section 3.2.1 in reverse order. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 29: Replacing The Printed Circuit Board And Display

    The smaller capacity load cells require the down- stop clearance to be decreased for proper load cell protection. Adjustment screws are placed in the Sub-pan down-stop bosses to reduce the clearance, see figure 3-6. Navigator Series Service Manual Ohaus Corporation www.ohaus.com...
  • Page 30 ¼ turn. Repeat the test to see if it is corrected. 6. If the weight is placed at the edges of the pan there may be a weight change which indicates the down-stop is working and this is okay. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 31: Calibration Mass Values

    Make sure the test area is free from drafts and that the scale rests on a level and vibration-free surface. 4.1 TEST MASSES REQUIRED The masses required to test the Ohaus Navigator 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...

  • Page 32: Lcd Segment Display

    Figure 4-1 LCD Segment Display Figure 4-2 LED (old) Segment Display Figure 4-3 LED (new) Segment Display 4.4 LOAD CELL TEST USING RAMP To test the Load Cell using RAMP, see Appendix B. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 33: Tolerances

    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 ± the precision tolerance in Table 4-2. Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 34: Repeatability Test

    A. Set the instrument to display the same units as the performance specifications. (Usually kg, g, or mg) Record Settings: Stability Setting = ____________ Filter Level Setting = ____________ Auto Zero Tracking Setting = ____________ Displayed Units = ____________ Mass Used = ____________ Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 35: Repeatability Worksheet

    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) Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 36: Linearity Test Masses

    6. Place the test mass on the Scale, record the weight and remove. 7. Place Load 3 on the Scale and press TARE. 8. Place the test mass on the Scale and record the weight. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 37: Off-Center Load Test

    Figure 4-4. Navigator Load Cell and Weighing Pan 1. Place the test weight in the center of the Weighing Pan. 2. Tare the balance. 3. Move the weight to point A and record the reading. Navigator Series Service Manual Ohaus Corporation www.ohaus.com...
  • Page 38 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 Navigator Series Service Manual...

  • Page 39: Parts Lists & Diagrams

    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...

  • Page 40: Housing & Internal Parts

    CHAPTER 5 PARTS LISTS & DIAGRAMS HOUSING & INTERNAL PARTS Figure 5-1. Navigator NVL and NVT: Housing & Internal Parts Ohaus Corporation www.ohaus.com Navigator Series Service Manual...
  • Page 41 Level Bubble and Light Guide Battery Cover Interface Cover Battery Connection Spring Feet Hardware Kit Not shown Power Adapter (no plugs) Not shown Power Adapter Plug Set Not shown Packaging, Insert Not shown Box, Shipping Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 42: Appendix A. Standard Calibration

    Then try to calibrate again. If it continues to fail, there may be an internal problem. To resolve internal problems, follow procedures in Chapters 2 and 3. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 43: A.2 Linearity Calibration

    Then try to calibrate again. If it continues to fail, there may be an internal problem. To resolve internal problems, follow procedures in Chapters 2 and 3. Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 44: Appendix B. Service Menu

    Service Linearity does not have limit ranges on the weights used as does the standard user linearity procedure. Note: Be careful not to touch the scale or the table while calibration is in progress, as it will cause the process to fail. When LIN appears, press Yes. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 45: B.4 Span Calibration

    Place the indicated weight in the center of the Pan. --C-- Pressing Yes after placing the prompted weight accepts the span weight shown on the display. The display then shows --C-- while the scale acquires the span point Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 46: B.5 Geographical Adjustment Factor (Geo)

    Values from 1 to 31 are available. No will increase the GEO value while Back will decrease it. Press Yes to accept the value shown on the display. The menu returns to the next item, Filter Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 47: B.6 Filter Settings

    The current stability setting is displayed. Set.5d Press No to increment the setting. Press Yes to accept the displayed value and advance to the next menu item, A-Zero. B.8 AUTO ZERO SETTING Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 48: B.9 Expanded Resolution (E.pand)

    Press Yes to enter the reset setting menu, No appears. Press No to toggle the setting, YES appears. To accept a chosen setting (either No or Yes) press Yes. The display will advance to the next menu item, End. Ohaus Corporation www.ohaus.com Navigator Series Service Manual...

  • Page 49: B.11 End

    Press Yes to exit the service menu or No to advance to the ramp menu setting. When the Service Menu is exited the scale will return to the last active mode with any changes from the Service menu. Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 50: Appendix C. Software Service Tool Instructions

    Navigator scale. It is used to re-configure the scale to its original parameters in the case of a PCB replacement. The latest software service tool and support files are available on the Ohaus DMX site. A personal computer running the Microsoft Windows operating system, Windows NT 4.0 or later, or Windows 98 or later, is required.
  • Page 51 Figure C-3. Diagnostic screen – Enter a “P” command. The scale should respond with a weight value (e.g., 0.2g). Enter a “V” command. The response should be the software version (e.g., Sr: 1.03). Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 52: C.2 Defining Led Display Version

    2. To configure the scale, enter the model name that appears on the Data Label (e.g. NVL5101, See figu.C-4) in the Model Name text box (See Fig.C-5). Figure C-4. Model Name on Data Label Figure C-6. Model Name entered Ohaus Corporation www.ohaus.com Navigator Series Service Manual...
  • Page 53 4. The bar is a graphical measure of the configuration progress. 5. When the downloading is complete, turn the scale off. 6. Turn the scale on and perform a Service Calibration (see Appendix B), followed by Operational and Performance tests (Chapter 4). Navigator Series Service Manual Ohaus Corporation www.ohaus.com...

  • Page 54: Appendix D. Geographical Adjustment Values

    41°12′ - 42°19′ 42°19′ - 43°26′ 43°26′ - 44°32′ 44°32′ - 45°38′ 45°38′ - 46°45′ 46°45′ - 47°51′ 47°51′ - 48°58′ 48°58′ - 50°06′ 50°06′ - 51°13′ 51°13′ - 52°22′ 52°22′ - 53°31′ 53°31′ - 54°41′ Ohaus Corporation www.ohaus.com Navigator Service Manual...
  • Page 55 62°09′ - 63°30′ 63°30′ - 64°55′ 64°55′ - 66°24′ 66°24′ - 67°57′ 67°57′ - 69°35′ 69°35′ - 71°21′ 71°21′ - 73°16′ 73°16′ - 75°24′ 75°24′ - 77°52′ 77°52′ - 80°56′ 80°56′ - 85°45′ 85°45′ - 90°00′ Navigator Service Manual Ohaus Corporation www.ohaus.com...
  • Page 58 ™ Registered trademark of Ohaus Corporation. 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.

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