OHAUS adventurer+ Service Manual
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OHAUS adventurer+ Service Manual

Analytical and precision balances
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Ohaus Corporation
19A Chapin Road
P.O. Box 2033
Pine Brook, NJ 07058-2033
ADVENTURER+
ANALYTICAL AND
PRECISION BALANCES
SERVICE MANUAL
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000

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  • Page 1 Ohaus Corporation 19A Chapin Road P.O. Box 2033 Pine Brook, NJ 07058-2033 ADVENTURER+ ANALYTICAL AND PRECISION BALANCES SERVICE MANUAL Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000...
  • Page 2 P.O. Box 2033 Pine Brook, NJ 07058-2033 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.
  • Page 3 ADVENTURER+ Service Manual P/N 83020790 A OHAUS DOCUMENT NUMBER 83020790 THIS DOCUMENT CONTAINS CONFIDENTIAL AND PROPRIETARY INFORMATION OF PART NUMBER OHAUS CORP. THE CONTENTS HEREOF MAY NOT BE USED NOR REPRODUCED IN 83020790 WHOLE PART WITHOUT WRITTEN AUTHORIZATION OHAUS CORPORATION. COPYRIGHT 2003 OHAUS CORPORATION...

  • Page 4: Table Of Contents

    Main Printed Circuit Board (PCB) Replacement - Precision and Analytical Balances ..36 4.4.5 RS232 Printed Circuit Board Replacement - Precision and Analytical Balances .... 36 4.4.6 Membrane Switch Replacement - Precision and Analytical Balances......36 AR Series Service Tool ........................38 Run ARServiceToolDealer.exe ....................38 Ohaus Corporation www.ohaus.com...
  • Page 5 Open COM PORT setting window....................39 Restore EEPROM Function ......................40 Replace Loadcell Function ......................40 Replace PCB Function ......................... 41 Download Software........................41 Diagnostic Function ........................42 DRAWINGS AND PARTS LISTS ......................43 DRAWINGS ............................ 43 Ohaus Corporation www.ohaus.com...

  • Page 6: Introduction

    1 INTRODUCTION 1.1 INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus Adventurer+ Analytical and Precision balances. Balances are rated from 65 grams to 4200 grams capacity. The content of this manual is contained in five chapters.

  • Page 7: Tools And Test Equipment Required

    ADVENTURER+ Service Manual P/N 83020790 A 1.3 TOOLS AND TEST EQUIPMENT REQUIRED In order to properly service the Ohaus Adventurer balances, certain Ohaus special tools and test items are required in addition to standard electronic tool kits. These items are listed as follows: 1.3.1 Special Tools...

  • Page 8: Specifications

    ADVENTURER+ Service Manual P/N 83020790 A 1.5 SPECIFICATIONS Complete specification for the Ohaus adventurer balances are listed in Table 1-2. When a balance has been serviced, it must meet the specifications listed in the table. Before servicing the balance, determine what specifications are not met.

  • Page 9: Theory Of Operation

    Long press－>Power off Short press－>Print result /Next to sub-menu Long press－>Switch Unit Short press－>Selected menu in main-menu Hold press－>Change to other weighing mode Hold press－>Set present mode parameter Short press－>Tare/Exit to menu Long press－>Go into Cal menu/Select other menu Ohaus Corporation www.ohaus.com...

  • Page 10: Overview Of The Display Indicators

    , all segments will appear briefly followed by a software revision number (when plugged in first time) or after a power interruption and then * 0.00g. Allow 20 minutes warm-up time. When the balance is first turned on, Ohaus Corporation www.ohaus.com...

  • Page 11: Menu Setup

    . To enter a selected menu, press . After you make selections in any menu, you may continue to make additional changes in other menus before exiting and saving. To exit a menu and return to weigh mode, press Figure 2-1 Balance Menus Ohaus Corporation www.ohaus.com...

  • Page 12: Transducer Description

    2.7 BLOCK DIAGRAM CIRCUIT DESCRIPTION Figure 2-3 illustrates the Adventurer electronic circuitry as a block diagram. 2.7.1 Main PC Board Power Supply Power is supplied to the balance through an AC/AC adapter which provides 12 Volts ac or DC/DC adapter which Ohaus Corporation www.ohaus.com...

  • Page 13: Cell Pc Board

    The EEPROM is a 2048 x 8 bit electrically erasable and programmable memory which stores resettable parameters such as the temperature compensations coefficient, unit, scaling factor etc. 2.7.3 RS232 Board The data I/O operation is controlled by the UART unit which is integrated in the micro controller. Signals RXD, Ohaus Corporation www.ohaus.com...
  • Page 14 ADVENTURER+ Service Manual P/N 83020790 A TXD, DTR and DSR are provided and go to a driver/receiver IC located on the RS232 board. Figure 2-3 Adventurer Balance Block Diagram Ohaus Corporation www.ohaus.com...

  • Page 15: Troubleshooting

    In the event that erratic or fluctuating weight readings are observed, it is necessary to isolate the problem to either the mechanical area or the electronic area of the balance. If a problem arises that is not covered in this manual, contact: Ohaus Corporation 19A Chapin Road P.O. Box 2033...

  • Page 16: Error Codes

    Weight reading below underload limit. Put platform on balance. Error 9.5 Calibration information is error Send the balance back to Ohaus and repaired. Repeat to connect or disconnect power. Error 5.3 Can not read EEPROM datum on loadcell. If can't be remedy, send back to Ohaus.

  • Page 17: Maintenance Procedures

    4 MAINTENANCE PROCEDURES 4.1 PREVENTIVE MAINTENANCE Ohaus balances are precision instruments and should be carefully handled, stored in a clean dry area which is dust free, and cleaned periodically. It is recommended that when a balance has had chemicals or liquids spilled on it, the balance should be cleaned as soon as possible.

  • Page 18: Calibration

    AR153 75/150 AR223 100/200 AR323 150/300 AR423 200/400 AR423D 200/400 AR522 250/500 AR1502 1520 1500 750/1500 AR2202 2200 2000 1000/2000 AR3202 3200 3000 1500/3000 AR4202 4200 4000 2000/4000 1000 AR4202D 4200 4000 2000/4000 AR4201CN 4200 4000 2000/4000 Ohaus Corporation www.ohaus.com...
  • Page 19 --0-- is displayed in the main area (CLEAN PAN is displayed in auxiliary area). The first mass placed is first removed. 7. Remove the mass from the pan. BUSY is momentarily displayed and LIN DONE is displayed in the auxiliary area. Then the balance returns to the weighing mode. Ohaus Corporation www.ohaus.com...

  • Page 20: Performance Tests - Precision And Analytical Balances

    Table 4-2, the balance does not meet the precision specification. Inspect and correct the following areas: 5A. 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. Ohaus Corporation www.ohaus.com...
  • Page 21 Shorting pins 5 and 1 turns the unit on and tares. Shorting pins 4 and 1 turns the unit off. See Figure 4-7, page 4-14 for pin connections. 1. Refer to paragraph 4.3.1, page 4-10 and open the balance. Ohaus Corporation www.ohaus.com...
  • Page 22 Correct the worst error first by turning Adjusting Screws on the Transducer shown in Figure 4-4. Figure 4-3. Mass Placement Locations. Figure 4-4 Load Adjustments Screw Locations 8. Repeat the Off-Center Load Test and adjustments until balance is within specifications. Ohaus Corporation www.ohaus.com...
  • Page 23 6. Press the >O/T< button to return the displayed weight to 0g. Slide mass front, back, left and right to Platform edge. Note displayed values. Correct any errors by turning Cornerload Adjusting Screws shown in Figure 4-5 (adjust the Hex Nut portion and ensure center screw does notturn). Ohaus Corporation www.ohaus.com...
  • Page 24 If the Off-Center Load Adjustment cannot be completed, refer to the Precision Test/Adjustment. 4.2.3.4 Centered Load Test - Precision and Analytical Balances The Centered load test is used to determine the span and linearity of the balance throughout its operating range Ohaus Corporation www.ohaus.com...
  • Page 25 1. Place the reference mass on the center of the Platform and record the exact value (all decimal places) displayed. 2. Remove the reference mass and verify that the display returns to zero. If it does not, disregard the reading, Ohaus Corporation www.ohaus.com...
  • Page 26 Compare the cumulative deviations to the maintenance Linearity tolerance for the particular balance model. For example, if an 210g balance yields the following results it would be within the tolerance. Cumulative Deviation -0.07 mg......largest negative value = -0.07 mg +0.01 mg +0.06 mg......largest positive value = +0.06 +0.01 mg Ohaus Corporation www.ohaus.com...

  • Page 27: Disassembly/Assembly Procedures

    Lay the Top Cover down and disconnect the cable from the main PC Board. You now have access to all components of the balance. See Ohaus Corporation www.ohaus.com...

  • Page 28: Re-Assembling The Balance

    Replace the Retaining Ring on top of the Top Cover two exposed screws and turn slightly to lock in place. b) Tighten the two screws holding the Retaining Ring. c) Replace the Sub Platform and weighing Platform. Ohaus Corporation www.ohaus.com...

  • Page 29: Replacement Of Major Components

    The decision to replace any component or remove for repair should only be made after thoroughly diagnosing the problem. If, after the replacement of any component, the balance is still nonfunctional and no other information on the subject is available in the manual, contact: Ohaus Corporation 19A Chapin Road P.O. Box 2033 Pine Brook, NJ 07058-2033 USA...
  • Page 30 5. Using a piece of tape, tape the position Sensor Board on the top and side to the frame. This is done so that the Sensor Board can be accurately positioned back in place. Use a razor blade to cut the tape between the Ohaus Corporation www.ohaus.com...
  • Page 31 Ratio Beam when the balance is operated. If the Sensor Board is postioned to low or to high, the balance will not function properly. 9. Resolder all wires paying attention to their location. Ohaus Corporation www.ohaus.com...
  • Page 32 Shaft Indicator to move properly, adjust the Up/Down Stop and try repositioning the sensor Board again. After completing this adjustment, turn the balance off and remove the Platform and Subplatform. Install the remaining screws in the Transducer. Ohaus Corporation www.ohaus.com...
  • Page 33 6. Locate the LED which is positioned in front of the sensor on the Position Sensor Board. 7. Unsolder the LED and replace. 8. Reassemble the balance. Perform procedures for the Position Sensor Board paragraph 4.4.2.5 and procedure 4.4.2.4 for the Ratio Beam replacement. 9. Perform procedure 4.4.2.7 and replace the Transducer. Ohaus Corporation www.ohaus.com...

  • Page 34: Transducer Removal - Analytical

    Transducer with two screws removed from the Bottom Mounting Plate. This is necessary to prevent further damage from occuring when trying to remove and replace individual Flexures. Figure 4-9. Shimming The Center Post. 1. Remove the three screws which secure Bottom Mounting Plate to Transducer Base. Ohaus Corporation www.ohaus.com...
  • Page 35 5. Unsolder coil cable from Position Sensor PC Board. 6. Unsolder thermistor wires from Position Sensor PC Board. 7. Remove the two screws holding the position Sensor Board from the Transducer Frame. 8. Remove the Position Sensor PC Board. Ohaus Corporation www.ohaus.com...

  • Page 36: Main Printed Circuit Board (Pcb) Replacement - Precision And Analytical Balances

    7. After assembly, verify that the balance meets all specifications. Perform all tests. 4.4.6 Membrane Switch Replacement - Precision and Analytical Balances The Membrane Switch is mounted on the Top Cover. The replacement Membrane Switch is supplied with a peel Ohaus Corporation www.ohaus.com...
  • Page 37 6. Place the Top Cover into position next to the base and connect the Membrane Switch cable to the connector on the Main PC Board. 7. Refer to paragraph 4.3.2, page 4-11 and re-assemble the balance. 8. After assembly, verify that the balance meets all specifications. Perform all tests. Ohaus Corporation www.ohaus.com...

  • Page 38: Ar Series Service Tool

    5.1 Run ARServiceToolDealer.exe ARServiceToolDealer.exe is used by service part and dealer, and files of Data5.ohs and Data6.ohs are given. Get the version information of the service tool by clicking “Help” menu and then selecting “About AR Series Service Tool”. Ohaus Corporation www.ohaus.com...

  • Page 39: Open Com Port Setting Window

    ADVENTURER+ Service Manual P/N 83020790 A 5.2 Open COM PORT setting window Accord the setting of scale to set service tool COM PORT setting. The default setting is 2400, 7, n, 2, none. Ohaus Corporation www.ohaus.com...

  • Page 40: Restore Eeprom Function

    5.3 Restore EEPROM Function Enter Serial Number and IDNR Number, select image file and then click Write Image File button to restore EEPROM. The image file can be got from OHAUS by the SN and IDNR number. 5.4 Replace Loadcell Function Enter Model number, IDNR number and Serial Number.

  • Page 41: Replace Pcb Function

    ADVENTURER+ Service Manual P/N 83020790 A 5.5 Replace PCB Function Enter Serial Number then click Start button to replace PCB. 5.6 Download Software Click change button to select mot file. Ohaus Corporation www.ohaus.com...

  • Page 42: Diagnostic Function

    ADVENTURER+ Service Manual P/N 83020790 A Click Start Download button and waiting to download file. 5.7 Diagnostic Function Send command by Entering command and clicking Send button. Ohaus Corporation www.ohaus.com...

  • Page 43: Drawings And Parts Lists

    The balance MUST meet the parameters of all applicable specifications in this manual. If further technical information is needed, please contact: Ohaus Corporation 19A Chapin Road P.O. Box 2033 Pine Brook, NJ 07058-2033 USA...
  • Page 44 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-1 Overall Exploded View of Precision Balance without drift shield Ohaus Corporation www.ohaus.com...
  • Page 45 ADVENTURER+ Service Manual P/N 83020790 A Table 6-1 Precision Balance (without Drift Shield) Replacement Parts List Ohaus Corporation www.ohaus.com...
  • Page 46 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-2 Exploded View of Precision Transducer (without drift shield mode). Table 6-2 Precision Transducer Parts List Ohaus Corporation www.ohaus.com...
  • Page 47 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-3 Overall Exploded View of Precision Balance (with drift shield). Ohaus Corporation www.ohaus.com...
  • Page 48 ADVENTURER+ Service Manual P/N 83020790 A Table 6-3 Precision Balance (with Drift Shield) Replacement Parts List Ohaus Corporation www.ohaus.com...
  • Page 49 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-4 Exploded View of Precision Transducer (with drift shield mode). Table 6-4 Precision Transducer Parts List Ohaus Corporation www.ohaus.com...
  • Page 50 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-5 Overall Exploded View of Analytical Balance Ohaus Corporation www.ohaus.com...
  • Page 51 ADVENTURER+ Service Manual P/N 83020790 A Table 6-5 Analytical Balance Replacement Parts List Ohaus Corporation www.ohaus.com...
  • Page 52 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-6 Exploded View of Analytical Transducer. Table 6-6 Analytical Transducer Parts List Ohaus Corporation www.ohaus.com...
  • Page 53 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-7 Schematic drawing of main board (1) Ohaus Corporation www.ohaus.com...
  • Page 54 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-8 Schematic drawing of main board (2) Ohaus Corporation www.ohaus.com...
  • Page 55 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-9 Schematic drawing of main board (3) Ohaus Corporation www.ohaus.com...
  • Page 56 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-10 Main board assembly (Top) Ohaus Corporation www.ohaus.com...
  • Page 57 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-11 Main board assembly (Bottom) Ohaus Corporation www.ohaus.com...
  • Page 58 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-12 Schematic drawing of Cell board Ohaus Corporation www.ohaus.com...
  • Page 59 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-13 Main board assembly (Top) Ohaus Corporation www.ohaus.com...
  • Page 60 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-14 Main board assembly (Bottom) Ohaus Corporation www.ohaus.com...
  • Page 61 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-15 Schematic drawing of RS232 board Ohaus Corporation www.ohaus.com...
  • Page 62 ADVENTURER+ Service Manual P/N 83020790 A Figure 6-16 Main board assembly (Top) SERVICE MANUAL - ADVENTURER BALANCES P/N 83020790 A Ohaus Corporation www.ohaus.com...

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