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OHAUS Explorer Balances User Manual

OHAUS Explorer Balances
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Explorer
®
Balances
Service Manual

Table of Contents

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OHAUS Explorer Balances Specifications

General IconGeneral
ReadabilityVaries by model (0.1 mg to 1 g)
CalibrationInternal or external, depending on model
ConnectivityRS232, USB (host and device), Ethernet
Power SupplyAC adapter
Unitsg, kg, lb, oz, ct
Stabilization TimeTypically 2-3 seconds

Summary

1 GETTING STARTED

1.1 INTRODUCTION

Provides an overview of the service manual's contents and structure.

1.2 SERVICE FACILITIES

Details the environmental and workspace requirements for servicing balances.

1.3 TOOLS AND TEST EQUIPMENT REQUIRED

Lists common hand tools, software, and test equipment needed for service.

1.4 SPECIFICATIONS

Presents technical specifications for various Ohaus Explorer® balance models.

1.5 BALANCE OPERATION

Explains the fundamental operation and user interface of the Explorer® balance.

1.5.1 Overview of the Controls

Identifies key display elements, touch areas, and functional icons on the balance.

1.5.2 Main Menu and Principal Functions

Details the balance's main menu structure and principal functions.

1.5.3 Menu Navigation

Describes how to navigate through the balance's menus and select options.

1.5.4 Changing Settings

Explains the process for navigating and modifying balance settings.

1.5.5 Functions and Icons

Describes common icons and their associated functions for balance operation.

1.6 LEGAL FOR TRADE (LFT)

Details Legal For Trade settings and their impact on menu access and operation.

1.7 MENU STRUCTURE

Outlines the overall menu hierarchy, including User and Diagnostics menus.

1.7.1 User Menu

Describes the functions and icons available within the User Menu.

1.7.2 Diagnostics Menu

Explains how to access diagnostic features and verify component operation.

1.8 Securing the Menu and Key Lock menu settings

Explains the use of the slide switch for menu and key lock security.

1.9 Display Touch Areas

Identifies the interactive areas on the balance's display screen.

2 DIAGNOSTIC GUIDE

2.1 TROUBLESHOOTING

Provides general procedures and a diagnostic guide for troubleshooting balance issues.

2.2 SOFTWARE

Discusses software-related issues, versions, and upgrade procedures.

2.3 DIAGNOSTIC GUIDE

Explains how to use the diagnostic guide to locate and fix probable causes.

3 MAINTENANCE / REPAIR PROCEDURES

3.1 PREVENTIVE MAINTENANCE

Details regular cleaning, inspection, and care for Ohaus balances.

3.2 OPENING THE BALANCE

Provides general instructions for disassembling the Explorer® balance.

3.3 REPLACING THE LOAD CELL (not 12001, 24001 and 35001)

Procedure for replacing the load cell in specific Explorer® models.

3.4 REPLACING THE LOAD CELL (12001, 24001 and 35001)

Procedure for replacing the load cell in high capacity Explorer® models.

3.5 REMOVING LOAD CELL PROTECTION SCREWS

Details removing shipping protection screws after load cell assembly.

3.6 REPLACING THE PRINTED CIRCUIT BOARD ASSEMBLIES (PCBA)

Instructions for replacing printed circuit boards, emphasizing ESD protection.

3.7 Replacing the Function Label

Instructions for removing and installing a new function label on the touch panel.

3.8 Replacing the Touch Panel

Procedure for replacing the touch panel, including related component replacement.

3.9 Replacing the Feet

Details the process and components for replacing the balance feet assemblies.

3.10 Replacing the Motor and Motor PCBA

Instructions for replacing the motor and its associated printed circuit board assembly.

4 TESTING

4.1 TEST MASSES REQUIRED

Lists the required test masses and their quality classes for calibration.

4.2 OPERATIONAL TEST

Steps to verify the balance starts up correctly and check for errors.

4.3 LOAD CELL TEST USING RAMP

Refers to Appendix B for testing the load cell using the RAMP function.

4.4 PERFORMANCE TESTS

Describes tests to evaluate balance performance and accuracy after service.

4.4.1 Precision Test

A quick test measuring the deviation of weight readings for accuracy.

4.4.2 Repeatability Test (non-approved models)

Measures standard deviation from weight readings to assess consistency.

4.4.3 Linearity Test

Evaluates the linearity of the unit across its operating range using test masses.

4.4.4 Off-Center Load Test

Determines if displayed values are affected by sample placement on the pan.

5 PARTS LISTS & DIAGRAMS

5.1 TERMINAL SPARE PARTS

Lists and illustrates spare parts for the balance's terminal module.

5.2 BASE SPARE PARTS (Non-Draftshield models)

Lists and illustrates spare parts for non-draftshield balance base models.

5.3 BASE SPARE PARTS (Draftshield models)

Lists and illustrates spare parts for draftshield balance base models.

5.4 BASE SPARE PARTS (EX12001, EX24001, EX35001)

Lists and illustrates spare parts for high capacity Explorer® balance bases.

5.5 DRAFTSHIELD SPARE PARTS

Lists and illustrates spare parts specifically for the draftshield assembly.

APPENDIX A - USER CALIBRATIONS

A.1 SPAN CALIBRATION

Instructions for performing span calibration using internal or external weights.

A.2 LINEARITY CALIBRATION

Discusses linearity calibration and refers to service linearization procedures.

A.3 TOUCH SCREEN CALIBRATION

Procedure for recalibrating the touch screen display.

APPENDIX B - DIAGNOSTIC / SERVICE MENU

B.1 User Accessible Diagnostics

Details diagnostic tools accessible by the user for component verification.

B.2 Service Sub-Menu

Describes the service sub-menu, requiring a password for access and advanced functions.

APPENDIX C - SOFTWARE SERVICE TOOL INSTRUCTIONS

C.1 Balance Commands

Lists commands used to send instructions to the balance via its interface.

C.2 RS232 (DB9) Pin Connections

Diagram and description of RS232 port pin assignments for connectivity.

C.3 USB Interface

Explains the USB interface, drivers, and connection process for the balance.

APPENDIX D – FIRMWARE UPGRADE VIA USB

STEPS

Step-by-step guide for upgrading the balance firmware using a USB flash drive.

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