OHAUS TROOPER SCALE Service Manual
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OHAUS TROOPER SCALE Service Manual

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Ohaus Corporation
Ohaus Corporation
Ohaus Corporation
Ohaus Corporation
Ohaus Corporation
19A Chapin Road
P.O. Box 2033
Pine Brook, NJ 07058-2033 USA
www.ohaus.com
TROOPER SCALE
SERVICE MANUAL
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000

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Summary of Contents for OHAUS TROOPER SCALE

  • Page 1 Ohaus Corporation Ohaus Corporation Ohaus Corporation Ohaus Corporation Ohaus Corporation 19A Chapin Road P.O. Box 2033 Pine Brook, NJ 07058-2033 USA www.ohaus.com TROOPER SCALE SERVICE MANUAL Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000...
  • Page 3 Trooper Scale 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. Reproduc- tion of this material is strictly prohibited.

  • Page 5: Table Of Contents

    4.2.1.1 Segment Display Test ............4-1 4.2.2 Menu Structure................4-2 4.2.3 Trooper Switch Functions ............... 4-3 4.2.4 Trooper Scale Menu Operation ............4-3 4.2.4.1 How to Enter the Menus ............ 4-3 4.2.4.2 How to Select a Specific Menu .......... 4-3 4.2.4.3 How to Enter an Individual Menu ........
  • Page 6 TABLE OF CONTENTS (Cont.) CHAPTER 4 MAINTENANCE PROCEDURES (Cont.) Page 4.2.4.6 How to Quit the Menus ................4-4 4.2.5 Calibration ..................4-4 4.2.6 Legal for Trade (LFT) Operation and LFT Sealing ......4-9 4.2.7 Performance Tests ................ 4-10 4.2.7.1 Repeatability Test ............4-10 4.2.7.2 Off-Center Load Test ............
  • Page 7 RS232 Interface Pin Connections ........... 4-13 Connector Locations ............... 4-16 RS Connector and Loadcell Connector Wiring ........ 4-17 4-10 Trooper Component Locations ............4-19 Exploded View of Trooper Scale ............5-2 Trooper Scale Interconnection Diagram ..........5-4 Keypad Wiring Diagram ..............5-4...

  • Page 9: Chapter 1 Introduction

    CHAPTER 1 INTRODUCTION OVERVIEW OF CONTROLS AND DISPLAY FUNCTIONS OVERVIEW OF CONTROLS AND DISPLAY FUNCTIONS OVERVIEW OF CONTROLS AND DISPLAY FUNCTIONS OVERVIEW OF CONTROLS AND DISPLAY FUNCTIONS OVERVIEW OF CONTROLS AND DISPLAY FUNCTIONS Designation Function Display LCD display, indicates weight, modes and setup information. Center of Zero LCD indicator prompt, indicates center of zero when within +/- 0.25d.

  • Page 10: Introduction

    Chapter 4 Maintenance Procedures - Contains preventive maintenance procedures, performance tests and adjustments, repair procedures, service mode procedures, and calibration procedures. Chapter 5 Drawings and Parts List - Contains exploded view of Trooper Scale identifying all serviceable replacement components with parts list.

  • Page 11: Tools And Test Equipment Required

    CHAPTER 1 INTRODUCTION 1.4 TOOLS AND TEST EQUIPMENT REQUIRED In order to properly service the Ohaus Trooper Scales, a standard electronic tool kit is required. No special tools and test items are required. 1.4.1 Special Tools None required. 1.4.2 Standard Tools and Test Equipment 1.

  • Page 12: Specifications

    CHAPTER 1 INTRODUCTION 1.6 SPECIFICATIONS Complete specificatons for the Ohaus Trooper Scales are listed in Tables 1-2 and 1-3 . When a scale has been serviced, it must meet the specifications listed in the tables. Before servicing the scale, determine what specifications are not met.

  • Page 13: Chapter 2 Theory Of Operation

    CHAPTER 2 THEORY OF OPERATION 2.1 TROOPER THEORY OF OPERATION This chapter contains information on the basic theory of operation of the Loadcell and scale circuit descriptions of the printed circuit board. An exploded view drawing is included in Chapter 5 which identifies all servicable components of the scale.

  • Page 14: Melsi

    CHAPTER 2 THEORY OF OPERATION PRINTED CIRCUIT BOARD THEORY (Cont.) 2.3.3 Microprocessor U7 The microprocessor U7 contains a built in RAM, ROM and an LCD driver. Crystal Y1 operates at a frequency of approximately 4.00 MHz and is used to control the frequency of the microprocessor. The microprocessor provides serial data to the LCD display as well as parameter storage to EEPROM U11.
  • Page 15 CHAPTER 2 THEORY OF OPERATION PRINTED CIRCUIT BOARD THEORY (Cont.) JUMP2 +EXC +SEN MSCLK SEG1 +SIG MCE- CONVERTER ANALOG L/C CGND U3, U4, U5, U8 SEG15 INPUT -SIG MSDI LCD DISPLAY -SEN MSDO & EL PANEL BACK LIGHT -EXC DRIVER JUMP1 COM1 COM4...
  • Page 16 CHAPTER 2 THEORY OF OPERATION...

  • Page 17: Chapter 3 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 scale. If a problem arises that is not covered in this manual, contact: Ohaus Corporation 19A Chapin Road P.O. Box 2033...

  • Page 18: Diagnostic Guide

    CHAPTER 3 TROUBLESHOOTING TABLE 3-1. DIAGNOSTIC GUIDE SYMPTOM PROBABLE CAUSE(S) REMEDY Unit will not turn on. Adapter not plugged in or prop- Check power cord connec- erly connected. tions. Make sure adapter connec- tor is plugged all the way into the Scale. Batteries dead or not properly Check battery connector.

  • Page 19: Error Codes

    CHAPTER 3 TROUBLESHOOTING TABLE 3-1. DIAGNOSTIC GUIDE (Cont.) PROBABLE CAUSE(S) REMEDY SYMPTOM RS232 not working. Verify communication pa- RS232 communication param- rameters. eters set up incorrectly. Improper or loose cable connec- Check cable connections. tions. Unable to calibrate unit. Set LCL to OFF in the Software Lockout switch set to ON and Lock Switch on the circuit LocSW menu, and set Lock...
  • Page 20 CHAPTER 3 TROUBLESHOOTING...

  • Page 21: Chapter 4 Maintenance Procedures

    CHAPTER 4 MAINTENANCE PROCEDURES 4.1 PREVENTIVE MAINTENANCE Ohaus scales 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 scale has had chemicals or liquids spilled on it, the scale should be cleaned as soon as possible.

  • Page 22: Menu Structure

    1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 Figure 4-2. Trooper Scale Menu.

  • Page 23: Trooper Switch Functions

    Short press - enter TARE. 4..2.4 Trooper Scale Menu Operation This section describes the menu operation. The menu permits matching the scale to specific weighing needs. In the menu, you can change the settings of the scale and activate functions. The Main Menu contains 6 sub menus.

  • Page 24: How To Enter An Individual Menu

    CHAPTER 4 MAINTENANCE PROCEDURES 4..2.4 Trooper Scale Menu Operation (Cont.) 4.2.4.3 How to Enter an Individual Menu A short press on the G/N/T MENU button = YES and you can enter a specific menu. 4.2.4.4 How to Enter an Individual Menu Item When in any menu, a short press on the G/N/T MENU button = YES and you can enter a specific menu item.

  • Page 25: Calibration Masses

    CHAPTER 4 MAINTENANCE PROCEDURES 4.2.5 Calibration (Cont.) Procedure TURNING CALIBRATION LOCK SWITCH OFF To turn the software lock off: Press and hold the G/N/T/ MENU button until MENU appears. Release it and SETuP appears. (if already in the main menu, skip to the next step).
  • Page 26 CHAPTER 4 MAINTENANCE PROCEDURES 4.2.5 Calibration (Cont.) For span calibration, there are a number of choices for calibration. The highlighted number is the default. To change the span calibration value read the setup section of the menu. In the Setup menu, change the CP selection to the desired value.
  • Page 27 CHAPTER 4 MAINTENANCE PROCEDURES 4.2.5 Calibration (Cont.) Procedure TURNING CALIBRATION LOCK SWITCH ON To turn the software lock on: Press and hold the G/N/T/ MENU button until MENU appears. Release it and SETuP appears. (if already in the main menu, skip to the next step).
  • Page 28 CHAPTER 4 MAINTENANCE PROCEDURES 4.2.5 Calibration (Cont.) Procedure LINEARITY CALIBRATION As with span calibration, confirm that calibration is really required. If required, refer to page 20 and turn the Calibration Lock Switch off. With the Scale ON, press and hold the button G/N/T/ MENU until MENU is displayed.

  • Page 29: Legal For Trade (Lft) Operation And Lft Sealing

    The two screws are cross drilled Figure 4-3. Lock Switch Location. and can accept a wire seal. NOTICE: The Trooper Scale has been tested and found to comply with Class lll requirements of NIST Handbook 44. After the Scale has been tested and found to...

  • Page 30: Performance Tests

    CHAPTER 4 MAINTENANCE PROCEDURES 4.2.7 Performance Tests Accurate performance of the Trooper scales is determined by a series of three performance tests. The displayed readings are compared with the tolerances listed in Table 4-2. Tolerance values are expressed in counts. A one count change is equal to the last digit shown on the scale display. TABLE 4-2.

  • Page 31: Off-Center Load Test

    CHAPTER 4 MAINTENANCE PROCEDURES 4.2.7.2 Off-Center Load Test The Off-Center Load Test is used to determine whether displayed weight values will be affected by moving the sample to different areas of the Platform. See Figure 4-6. Place 1/2 of the scale capacity in the center of the Platform. Press the ON/ZERO OFF button to return the reading to zero.
  • Page 32 If after several attempts the display fails to return to zero, a repeatability problem is indicated and the scale must be serviced by an Ohaus Product Service Specialist. 6. Repeat steps 3 through 5 using Load 2, Load 3 and Load 4 as applicable.

  • Page 33: Rs232 Interface Test

    CHAPTER 4 MAINTENANCE PROCEDURES 4.2.8 RS232 Interface Test The RS232 Interface in the Trooper scale can have its performance monitored using an external printer or computer connected to the scale. The RS232 Interface is a bi-directional interface which enables the scale to communicate with a printer or computer equipped with an RS232 serial port.

  • Page 34: Print Test

    CHAPTER 4 MAINTENANCE PROCEDURES 4.2.8.1 Connecting the RS232 Interface (Cont.) RS232 Commands All communication is accomplished using standard ASCII format. Only the characters shown in the RS232 Command Table 4-4 are acknowledged by the scale. Invalid command response "ES" error indicates the scale has not recogonized the command.

  • Page 35: Repair Procedures

    CHAPTER 4 MAINTENANCE PROCEDURES REPAIR PROCEDURES This section describes how to change individual components of the Trooper scales. When doing this, please refer to the exploded view drawings and spare parts lists in section 5. Important: after replacing components, a functional check of the scale must always be carried out. 4.3.1 Replacing the Keypad Membrane The keypad membrane is affixed to the upper housing of the scale.

  • Page 36: Replacing The Pc Board

    CHAPTER 4 MAINTENANCE PROCEDURES 4.3.2 Replacing the PC Board The PC Board is located inside the scale towards the front. To replace the PC Board, it is necessary to disassemble the scale. 1. Remove power from the scale. 2. Carefully lift and remove the platform from the scale. You will find that one rubber foot remains attached to the platform, this is normal.

  • Page 37: Rs Connector And Loadcell Connector Wiring

    CHAPTER 4 MAINTENANCE PROCEDURES 4.3.2 Replacing the PC Board (Cont.) 6. Carefully remove the wires coming from J10 which is the RS232 connector and J4 which is used to connect the loadcell. See figure 4-9 for wire color and locations. RS232 CONNECTOR PINS TO LOAD CELL...

  • Page 38: Replacing The Spider Assembly (Loadcell)

    CHAPTER 4 MAINTENANCE PROCEDURES 4.3.3 Replacing the Spider Assembly (Loadcell) The Spider assembly is centrally located inside the scale and contains the loadcell. See Figure 4-10. This assembly is factory assembled and the downstops are preadjusted. There are no adjustments to be made on this assembly after installation. 1.

  • Page 39: Trooper Component Locations

    CHAPTER 4 MAINTENANCE PROCEDURES DC POWER JACK BATTERY BOX RS232 CONNECTOR SPIDER ASSEMBLY FERRITE CORE LOADCELL LOCK SWITCH RS232 CABLE BATTERY BOX LOADCELL & CABLE POWER CONNECTOR CABLES PC BOARD KEYPAD CONNECTOR LED DISPLAY Figure 4-10. Trooper Component Locations. 4-19...
  • Page 40 CHAPTER 4 MAINTENANCE PROCEDURES 4-20...

  • Page 41: Chapter 5 Drawings And Parts Lists

    If further technical information is needed, in the United States call toll-free 1-800-526-0659 between 8.00 a.m. and 4.00 p.m. EST. An Ohaus factory service technician will be available to provide assistance. Outside the U.S.A., please contact:...

  • Page 42: Trooper Exploded View

    CHAPTER 5 DRAWINGS AND PARTS LISTS 5.1.1 Trooper Exploded View 11 1 10 10 11 11 14 14 12 12 13 13 17 17 22 22 16 16 18 18 19 19 21 21 20 20 15 15 Figure 5-1. Exploded View of Trooper Scale.

  • Page 43: Trooper Parts List

    CHAPTER 5 DRAWINGS AND PARTS LISTS TABLE 5-1. TROOPER PARTS LIST ITEM NO. PART NO. DESCRIPTION QUANTITY 71133849 Assembly, Platter, Trooper 71133037 Keyboard & Overlay 71102326 Bubble Level, Dia. 16.5mm 71133034 Upper Housing, Trooper - - - - - - - - Screw, M4x8 71133746 Load Cell Assembly, 3kg, With Frame...
  • Page 44 Load Cell 6.5kg (71132247) (71134510) 15kg (71134509) 30kg 40kg (71134830) Adaptor Input KBD/Overlay Main, Trooper Black (71134281) (71133037) Batt. Holder Black TEST Figure 5-2. Trooper Scale Interconnection Diagram. Print G/N/T On/Zero Tare Units Menu KEYBOARD OUTPUT Figure 5-3. Keypad Wiring Diagram.
  • Page 46 SERVICE MANUAL - TROOPER SCALES P/N 80250901...

This manual is also suitable for:

Trooper seriesTrooper tr3rsTrooper tr6rsTrooper tr15rsTrooper tr30rs

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