OHAUS EXPLORER User manual

Ohaus Corporation www.ohaus.com 1 Explorer 5 Semi-Micro Balances

Explorer®Semi-Micro Balances

Service Manual

Page No.

1 GETTING STARTED 1

1.1 INTRODUCTION 1

1.2 SERVICE FACILITIES 1

1.3 TOOLS AND TEST EQUIPMENT REQUIRED 2

1.4 SPECIFICATIONS 2

1.5 UNIT CAPACITY AND READABILITY 3

1.6 BALANCE OPERATION 4

1.6.1 Overview of the Controls 4

1.6.2 Main Menu and Principal Functions 5

1.6.3 Menu Navigation 5

1.6.4 Changing Settings 6

1.6.5 Functions and Icons 7

1.7 IONISZER 9

1.8 LEGAL FOR TRADE (LFT) 9

1.9 MENU STRUCTURE 10

1.9.1 User Menu 10

1.9.2 Diagnostics Menu 10

1.10 Securing the Menu and Key Lock menu settings 11

2 DIAGNOSTIC GUIDE 12

2.1 TROUBLESHOOTING 12

2.2 SOFTWARE 12

2.3 DIAGNOSTIC GUIDE 12

3 MAINTENANCE / REPAIR PROCEDURES 16

3.1 PREVENTIVE MAINTENANCE 16

3.2 OPENING THE BALANCE 16

3.2.1 Preparation for Opening Explorer® Models 16

3.2.2 Opening the Terminal Module 18

3.2.3 Opening the Base Module with a Draftshield 20

3.3 REPLACING THE LOAD CELL 22

3.4 REPLACING THE PRINTED CIRCUIT BOARD ASSEMBLIES (PCBA) 25

3.4.1 Terminal 25

3.4.2 Base 28

3.5 Replacing the Function Label 30

3.6 Replacing the Touch Panel 31

3.7 Replacing the Feet 31

3.8 Replacing the Ionizer 32

3.9 Replacing the Auto Door Mechanism 33

3.9.1 Replacing the PCBA door sensor 33

3.9.2 Replacing bracket driver assembly 34

3.9.3 Assemble motor driver assembly 35

3.9.4 Replacing motor 35

Page No.

4 TESTING 36

4.1 TEST MASSES REQUIRED 36

4.2 OPERATIONAL TEST 36

4.3 LOAD CELL TEST USING RAMP 36

4.4 PERFORMANCE TESTS 36

4.4.1 Precision Test 37

4.4.2 Repeatability Test (non-approved models) 37

4.4.3 Linearity Test 39

4.4.4 Off-Center Load Test 39

5 PARTS LISTS & DIAGRAMS 41

5.1 TERMINAL SPARE PARTS 41

5.2 BASE SPARE PARTS EXPLOERER 5 DECIMAL 43

5.3 DRAFTSHEILD SPARE PARTS EXPLORER 5 DECIMAL 45

APPENDIX A - USER CALIBRATIONS 47

A.1 SPAN CALIBRATION 47

A.2 LINEARITY CALIBRATION 48

A.3 TOUCH SCREEN CALIBRATION 48

APPENDIX B - DIAGNOSTIC / SERVICE MENU 49

B.1 User Accessible Diagnostics 49

B.2 Service Sub-Menu 50

APPENDIX C –SERVICE TOOL 54

C.1 Balance Commands 54

C.2 RS232 (DB9) Pin Connections 58

C.3 USB Interface 58

APPENDIX D –FIRMWARE UPGRADE VIA USB 60

LIST OF TABLES

TABLE NO. TITLE Page No.

1-1 Specifications ………………………………………………………………………………………………………..2

1-2 Capacity and Readability .................................................................................................................. .........3

1-3 LFT Settings ...............................................................................................................................................9

1-4 Explorer® User Menu ................................................................................................................................10

2-1 Diagnostic Guide .............................................................................................................................……..13

4-1 Calibration Mass Values ..................................................................................................................... ….37

4-2 Repeatability Worksheet ..................................................................................................................... ….39

4-3 Linearity Test –Reference and Load Masses ..................................................................................... …40

4-4 Off Center Load Mass Values ..................................................................................................................41

4-5 Tolerance Table ……………………………………………………………………………………………………42

5-1 Terminal Spare Parts ...............................................................................................................................43

5-2 Base Spare parts Explorer 5 Decimal Models………………………………………………………………….45

5-3 Draft Shield Spare Parts Explorer 5 Decimal Models………………………………………………………….47

B-1 Service Calibration Mass Values ......................................................................................................... …54

C-1 Interface Command List ...........................................................................................................................56

Ohaus Corporation www.ohaus.com 1 Explorer 5 Semi-Micro Balances

1 GETTING STARTED

1.1 INTRODUCTION

This service manual contains the information needed to perform routine maintenance and service

on the Ohaus Explorer® Series balances. Familiarity with the balance’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

balance.

Chapter 2 - Troubleshooting

Contains a diagnostic guide and error code table.

Chapter 3 - Maintenance Procedures

Contains preventive maintenance procedures and

disassembly, repair and replacement procedures.

Chapter 4 - Testing

Contains a list of required test masses, an

operational test, segment display test, performance

tests and adjustments.

Chapter 5 - Drawings and Parts Lists

Contains exploded views of Explorer® balances

identifying

all serviceable components.

Appendix A - User Calibrations

Explains user calibration procedures that may need

to be

performed during service.

Appendix B - Service Calibration

Describes the Service Menu and sub-menus, which

allow

authorized service personnel to see Ramp readings

and perform service calibrations.

Appendix C - Software Service Tool Instructions

Used to re-configure the balance after

replacing a Printed Circuit Board or Load-cell.

1.2 SERVICE FACILITIES

To service a balance, the service area should meet the following requirements:

Should be temperature controlled and meet balance specifications for temperature

environmental requirements.

Must be free of vibrations such as fork lift trucks close by, large motors, air currents or drafts

from air conditioning/heating ducts, open windows, people walking by, fans, etc.

Area must be clean and free of excessive dust.

Work surface must be stable and level.

Balance must not be exposed to direct sunlight or radiating heat sources.

Handle all electronic assemblies with appropriate Electro-Static protection.

Ohaus Corporation www.ohaus.com 2 Explorer 5 Semi-Micro Balances

1.3 TOOLS AND TEST EQUIPMENT REQUIRED

Common hand tools are sufficient to disassemble the Explorer® balances.

A PC running Microsoft Windows XP or later.

Explorer® Software Service Tool, PN 83032124

RS232 Cable –Balance to PC PN 80500525

Digital voltmeter (DVM) with an input impedance of at least 10 meg-ohms at 1 volt DC.

Masses as shown in Table 4-1.

1.4 SPECIFICATIONS

Specifications for the Ohaus Explorer® Balances are listed in Table 1-1. 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.

Special Note regarding Approved balances:

The specifications for the approved balances below are only for initial testing. These balances must

be tested according to the requirements of the local Weights and Measures authority. Before

returning the balance to service an approved representative of the local Weights and Measures

authority must certify the balance.

Ambient conditions

Indoor use only

Altitude: Up to 2000 m

Specified Temperature range: 18°C to 23°C

Humidity: maximum relative humidity 15%~80%, the change rate should be less than 10%/hour.

Mains supply voltage fluctuations: up to -15% to +10% of the nominal voltage

Over voltage category II

Pollution degree: 2

Operability is assured at ambient temperatures between 10°C and 30°C

TABLE 1-1 EX 5 Decimal Models.

MODEL

EX125D

EX125DM

EX125

EX125M

EX225D

EX225DM

EX225D/AD

EX225DM/AD

EX225/AD

EX225M/AD

Capacity

52g/120g

120g

120g/220g

220g

Readability d

0.01mg/0.1mg

0.01mg

0.01mg/0.1mg

0.01mg

Repeatability

(std. dev.)

(20g)

0.015mg

Ohaus Corporation www.ohaus.com 3 Explorer 5 Semi-Micro Balances

Repeatability

(std. dev.)

(100g)

0.1mg

0.03mg

0.03mg/0.1mg

0.03mg

Linearity (g)

±0.1mg

Zero Drift

0.10 mg/°C

Span

Sensitivity

0.80 ppm/°C

Note: MPE - Maximum Permissible Error

MPE

For loads (m) in verified units (e)

Class I

±0.5 e

0≤m≤50,000

±1 e

50,000<m≤200,000

±1.5 e

200,000<m

Maximum errors for balances in usage are twice the acceptable errors for initial verification.

1.5 UNIT CAPACITY AND READABILITY

The capacity and readability of the available units of measure are listed in Table 1-2.

TABLE 1-2 UNIT CAPACITY (Max) AND READABILITY (d)

Units

EX125D

EX125

EX225D;EX225D/AD

EX225/AD

grams

120

220

0.00001

0.0001

0.00001

0.0001

dwt

33.43678

77.1618

77.16180

141.4633

0.00001

0.0001

0.00001

0.0001

3.18445

7.3487

7.34874

13.4727

0.000001

0.00001

0.000001

0.00001

ozt

1.67617

3.8681

3.86809

7.0915

0.0000005

0.000005

0.0000005

0.000005

13.86667

32.0000

32.00000

58.6667

0.000005

0.00005

0.000005

0.00005

1.83425

4.2329

4.232875

4.23288

7.7603

0.0000005

0.000005

0.0000005

0.000005

260.00000

600.0000

600

600.00000

1100.0000

0.0001

0.001

0.0001

0.001

802.48220

1851.8820

1851.882

1851.88200

3395.1170

0.0002

0.002

0.0002

0.002

msg

11.28394

26.0399

26.03985

47.7397

0.000005

0.00005

0.000005

0.00005

baht

3.43008

7.9156

7.91557

14.5119

0.000001

0.00001

0.000001

0.00001

tola

4.45824

10.2882

10.28824

18.8618

0.000001

0.00001

0.000001

0.00001

Ohaus Corporation www.ohaus.com 4 Explorer 5 Semi-Micro Balances

52000.00000

120000.0000

120000

120000.00000

220000.0000

0.01

0.1

0.01

0.1

custom(1)

custom(2)

custom(3)

1.6 BALANCE OPERATION

The Explorer®is a very simple to use yet sophisticated balance. Please refer to the Explorer® Instruction

Manual for complete information on the set up and use of the balance.

1.6.1 Overview of the Controls.

This equipment utilizes a touch-sensitive display. Touch areas and Buttons to control the equipment’s functions.

CONTROLS

Touch to access application setup menu

Touch to change

applications

Touch to access

available libraries

Touch for information menu

Instructional Messages

Stability (*), Net (NET),

Gross (G) and/or center of

zero (>0<) indicators

Touch unit indicator to change

weighing unit

Capacity or Status Guides:

Vary by application

Result Fields: Information

varies by application

Application Buttons: Functions

vary by application

Touch icons to perform

specific functions or

access other functions

1.6.2 Main Menu and Principal Functions.

Ohaus Corporation www.ohaus.com 5 Explorer 5 Semi-Micro Balances

Touch Menu to open the menu list.

Touch and drag the Scroll bar to view additional items.

Calibration:

Touch to view calibration options.

User Settings:

Touch to view user preferences.

Balance Setup:

Touch to view balance settings.

Application Modes:

Touch to view application modes.

Weighing Units:

Touch to view weighing units.

GLP and GMP Data:

Insert user data for traceability.

Diagnostics:

Touch to view Diagnostics items.

Communication:

Touch to view COM Device Settings and Print

Settings.

Factory Reset:

Touch to do a Factory reset.

Library:

Touch to delete all Library records.

Lockout:

Touch to access the Lockout menu list.

I/O Settings:

Touch to view remote I/O Settings.

Information:

Touch to view list of topics.

1.6.3 Menu Navigation.

All menu navigation is performed by touching the display. To enter the Menu, touch Menu from

any Application Home screen. The Main menu appears, with buttons for Main, Back and Done.

Ohaus Corporation www.ohaus.com 6 Explorer 5 Semi-Micro Balances

Continue touching the appropriate list item to navigate to the Menu items or touch a button to

change location.

1.6.4 Changing Settings

These Icons are available to setup and operate the Balance. Refer to the Instruction Manual for

more information.

To change a menu setting, navigate to that setting using the following steps:

Enter the Menu

From any Application screen, Touch Menu. The Main Menu List appears on the display.

Select the Sub-Menu

Scroll down to the selected item of the Main. Menu List and touch it. The Sub-Menu appears.

Select the Menu Item

Continue until the desired setting is chosen in the Menu list. Touch the setting to change it. The changed

setting will be displayed as highlighted for 2 seconds to confirm the changed value.

Exit the Menu and Return to the Current Application.

After the setting is confirmed, touch Home to return to the Application.

Note: at any time the Main, Back & Done buttons can be touched to navigate to the desired area of

the menu or return to the current Application.

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