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

52

/

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

ti

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

m

13.86667

/

32.0000

32

32.00000

/

58.6667

0.000005

/

0.00005

0.000005

/

0.00005

oz

1.83425

/

4.2329

4.232875

4.23288

/

7.7603

0.0000005

/

0.000005

0.0000005

/

0.000005

ct

260.00000

/

600.0000

600

600.00000

/

1100.0000

0.0001

/

0.001

0.0001

/

0.001

GN

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

mg

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.

Ohaus Corporation www.ohaus.com 7 Explorer 5 Semi-Micro Balances

1.6.5 Functions and Icons

Seven Icons are initially available to operate the Balance and access the Menu. These Icons can be customized

based on user preference. For setup information, see User Settings.

1.6.5.1 Standby

Touch Standby to shut down the display.

Note: After initial start-up (Section 2), in Standby your balance needs no warm-up time and is

immediately available for weighing by touching the Start-up icon.

1.6.5.2 Printing Data

Touch Print to send the displayed value to a printer or computer via the active COM port.

Note: Ensure proper setup of connections, printing and interface parameters.

Note: Data may also be printed using the Touchless Sensors by configuring these for Printing.

Data may also be printed using the P command from a computer connected to the COM port.

1.6.5.3 Zero Operation

Remove the load from the pan and touch Zero to set the display to zero. When weighing pan is empty,

the >0< indicator turns on when the measurement is within + ¼ division (d) of the zero setting.

Note: The balance also features Auto Zero Tracking (AZT) that automatically maintains a Center of

Zero within the tolerances set in the AZT menu (see Balance Settings).

1.6.5.4 TouchLess Sensor Status

Explorer Semi-Mirco Balances have four TouchLess sensors that can be assigned a unique function

when activated (e.g., zero, print, tare, Automatic draftshield door etc).

To assign a task for each TouchLess sensor, press Sensors.

Note: To activate a sensor, move an object over it (from a distance of 1-2 inches or 3 cm). The sensor

shows a green light and beeps when activated. If the sensor cannot be activated (sensor is disabled

during certain instances, like when the Menu is displayed) the sensor shows a red light.

1.6.5.5 AutoCal

When AutoCal is ON, the balance performs a self calibration. AutoCal will automatically calibrate the

Balance (using the internal mass) each time a change in temperature significant enough to affect

accuracy, or after every 3 hours.

Touch AutoCal™ to initiate. (Default status is ON.)

Ohaus Corporation www.ohaus.com 8 Explorer 5 Semi-Micro Balances

1.6.5.6 Menu

Touch Menu to enter the balance’s menu list.

1.6.5.7 More…

Touch More to access Level Assist, Zero, Tare, Units, Pretare, Cal Test, Ionizer, Calculator, and

Stopwatch.

1.6.5.8 Level Assist

For assistance with Leveling the Balance; the Level Assist screen shows which direction to turn the

thumbwheels to center the level bubble.

1.6.5.9 Applications

The balance can be configured to operate in various Application modes.

Touch Applications to choose – or the top button in the Application area.

1.6.5.10 Taring a Container

Taring sets the weight of a container as zero, so only the weight of objects held in the container

(net weight) is displayed.

Manual Tare – Place the empty container on the pan and touch Tare when stable.

Add material to the container. The net weight of the material is displayed.

To clear the Tare value, remove the container from the pan and touch Tare.

1.6.5.11 Weighing Units

The balance can be configured to measure in a variety of weighing units, including three (3) custom

units. Touch Units to choose from the displayed list. (Scroll down to see all options.)

Note: The active weighing Unit can also be accessed by touching the unit area of the Main Display

line; If a unit is not displayed in the list, it must first be turned on via the User Menu.

1.6.5.12 Preset Tare

To enter a Preset Tare, press the Icon and then enter a value;

enter 0 to clear the Preset Tare. The display will show the PT symbol and the tare value as a negative

number.

1.6.5.13 Calibration Test

Used to compare a known calibration weight against the last stored span calibration data.

1.6.5.14 Ionizer (only for EX225D/AD and EX225/AD)

The Ionizer is used to eliminate static electricity. To use the Ionizer, touch the Ionizer icon. A pop-up

window will appear with the text: ‘The ionizer is neutralizing the static charges’.

1.6.5.15 Calculator

To use the built-in calculator application, touch Calculator. A four function calculator with addition,

subtraction, multiplication and division mathematical operations is available.

 Perform a numeric operation using the keypad.

 Press = to view the result.

 To Clear the display: Press CE to clear the entry, C to clear all

 Touch x to close and return to the current Application.

Ohaus Corporation www.ohaus.com 9 Explorer 5 Semi-Micro Balances

1.6.5.16 Stopwatch

To use the built-in stopwatch application, touch Stopwatch. A countdown timer with interval (lap) timer

is available.

 Press Start to begin using the Stopwatch timer.

 Press Reset to reset the timer to Zero.

 Touch Close to close and return to the current Application.

1.6.5.17 Logout

Used for User logout and return to User Login screen. This feature is only active if a user profile has

been created and a User has logged in.

1.7 Ionizer (EX225D/AD and EX225/AD only) and Glass Shelf

Step 1.

Place the glass tube in front of the

ionizer while the IR sensor has

activated the ionizer

Step 2.

After about 3 to 5 seconds, remove

the sample. The static electricity is

now eliminated

Step 3.

Sampling

1.8 LEGAL FOR TRADE (LFT)

When the balance is set for LFT (on “M” models), the following menu settings cannot be accessed / changed:

Calibration, Mode and Units. Type approved operation may force some balance settings as required by the

approval agency. In non-approved models the Menu lock switch may also limit access to certain menu items

based on the Balance lock out settings. The Service Menu (see section 1.8.2) is not available when the switch

is “on”. To regain access to the locked menu settings, move the Menu lock switch to the rear, which turns LFT

off.

TABLE 1-3 LFT SETTINGS

Legal For Trade

Use this menu to set the Legal for Trade status. OFF = standard operation. ON

= operation complies with Weights and Measures regulations.

When Legal for Trade is set to ON, the menu settings are affected as

follows:

Calibration Menu

 AutoCal internal Calibration, Automatic Calibration, and Calibration Test

 All other functions are hidden.

Balance Setup Menu

Ohaus Corporation www.ohaus.com 10 Explorer 5 Semi-Micro Balances



 Auto Zero Tracking is limited to 0.5 Division and

 Auto Tare and Gross Indicator are locked at their current setting.

 Graduations is locked at 1 Division.

Communication Menu



 Auto print mode selections are limited to OFF, On Stability, and Interval.

Continuous is not available.

Note:

The security switch under the Base must be in the locked position to set Legal for

Trade to ON. The security switch must be in the unlocked position to set Legal for

Trade to OFF.

After the Menu Lock setting has been turned off, the balance must be inspected in accordance with local

weights and measures regulations before it can be used in LFT mode again. Local authorities may secure

theswitch using paper seals, wire seals or plastic ties.

Note: “M” models- When the Menu Lock switch is set to “on” certain menu items will be forced to the

required setting and the required menus will be locked.

1.9 MENU STRUCTURE

Programmable features of the Explorer® are accessed through a graphical interface using the Display Touch

Panel. By touching an item on the display a further set of options will appear.

1.9.1 User Menu

For more detail on using the menu, see the Explorer® Instruction Manual.

TABLE 1-4 EXPLORER® USER MENU

Calibration

User

Settings

Balance

Setup

Applications

Weighing

Units

GLP and

GMP Data

Communication

Library

I/O

Settings

Diagnostics

Factory

Reset

Lockout

Information

Ohaus Corporation www.ohaus.com 11 Explorer 5 Semi-Micro Balances

1.9.2 Diagnostics Menu

1.10 Securing the Menu and Key Lock menu settings

A slide switch is used to secure the Menu Lock and Key Lock menu settings. When the switch is set to the ON

position, the Menu Lock and Key Lock menu settings may be viewed but not changed. This switch is located

under the Base.

Set the position of the switch to ON by sliding the external Lock Switch to LOCKED.

When the switch is in the ON position, the start up display includes the LOCK ON message.

Note: This switch is also used in conjunction with the Legal for Trade menu item. When the Legal for Trade

menu is set to ON, the switch must be set to the ON position to prevent calibration and changes to

metrologically significant settings.

Explorer Switch

Ohaus Corporation www.ohaus.com 12 Explorer 5 Semi-Micro Balances

2 DIAGNOSTIC GUIDE

This section of the manual contains troubleshooting information. Information is contained to isolate specific

problems using Table 2-1, Diagnostic Guide. Follow all directions step by step. Make certain that the work

area is clean. Handle balance components with care. Use appropriate electro-static protection devices to

prevent damage to the sensitive electronic components.

2.1 TROUBLESHOOTING

General procedures for Troubleshooting:

1 Do the most obvious, user-level remedies.

2. Visual Check:

- Check that the internal parts are clean and free from debris.

- Examine the balance for damage or signs of abuse, replace any damaged items.

1 Use the error code table for solutions for specific codes.

2 Use the Diagnostic Guide; locate the symptom then follow the suggested remedies in order.

2.2 SOFTWARE

In most cases understanding the customer’s problem with the balance is easy. Physical damage, displayed

error code, failure to power up and obvious poor performance can usually be repaired by following the

instructions in the following sections.

Some balance issues may be software related. New releases of the software may correct these issues. The

Explorer® Balance has upgradeable software in the Terminal and the Base modules. The software revision in

the balance can be seen when the balance is in standby mode or during the power up sequence. The software

version is displayed in the lower right hand corner of the

screen. The screen will show:

Model number Capacity and readability

Software Revision “Terminal” / “Base”

for example:

Explorer® EX125 120g x

0.00001g Version 2.10 / 2.10

The balance software can also be retrieved by sending a “PV” command via the RS232 or other

interface.

See Appendix C for the software upgrade procedure.

Check the Service Bulletins on the Ohaus DMX site for information on software upgrades.

2.3 DIAGNOSTIC GUIDE

Diagnostic Guide designed to help locate the problem area quickly and easily. The probable causes are listed

with the most common cause first. If the first remedy does not fix the problem, proceed to the next remedy.

Before attempting to repair the balance, read all chapters of this manual to be familiar with the balance

components and operation.

Diagnosis:

1 Isolate and identify the symptom.

2 Refer to Diagnostic Guide tables and locate the symptom.

3 Follow the suggested remedies in the order they appear.

Note: Allow equipment to warm up eight hours to stabilize.

Ohaus Corporation www.ohaus.com 13 Explorer 5 Semi-Micro Balances

4 Perform the indicated checks, or see the appropriate section of the manual.

5 Repair or replace the defective section of the balance.

NOTE:

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.

TABLE 2-1 DIAGNOSTIC GUIDE

Symptom

Possible Cause

Remedy

Cannot exit Standby Mode, possible

software lock-up.

Cycle the power off then on.

No power to the Adapter

Verify input voltage to the Power Adapter.

Cannot turn on

Bad Power Adapter

Verify the Power Adapter output voltage

using a DVM.

Input Jack or internal wiring is defective.

Verify 12VAC at the Power Jack wire

connection to the PCB.

Bad connection between terminal and

base

Re-connect base and terminal

Defective Base Main PCB

Replace base Main PCB, see Section

3.4.2

Software lock-up

Cycle the power off then on.

Touch Panel

controls do not

respond

Touch Panel defective

Replace, see Section 3.6

Bad touch panel calibration

Enter main menu to re-calibrate touch

panel, see Appendix A.

Defective Terminal Main PCB

Replace Terminal Main PCB, see Section

3.4.1

Improper calibration

Perform span calibration

Poor linearity performance

Perform linearity calibration

Incorrect weight

reading

Unstable environment- vibration, air

currents or changing temperature

Move balance to suitable location, allow

balance to stabilize its temperature

Internal mechanical interference

Verify the pan Support is not contacting

the top housing

Bad load cell

Replace load cell

Poor

repeatability

Internal mechanical interference

Verify the pan Support is not contacting

the top housing

Bad load cell

Replace load cell

Cannot calibrate

Calibration Menu locked

Unlock, see User manual

LFT set to ON

Turn LFT off.

Ohaus Corporation www.ohaus.com 14 Explorer 5 Semi-Micro Balances

Unstable environment- vibration, air

currents or changing temperature

Move balance to suitable location, allow

balance to stabilize its temperature

External Calibration mode- incorrect

calibration masses used

Use correct mass value as shown on the

scale or enter the known mass value as

instructed on the scale.

Incorrect weight reading or poor

repeatability

See Incorrect weight reading and Poor

repeatability

Cannot change

menu settings

Sub-menu locked

Unlock sub-menu

LFT set to on

Turn LFT off

Cannot access a

Mode

Desired Mode not enabled

Enter Main Menu then Application Modes

to set the appropriate mode on.

Cannot access a

Unit

Desired unit not enabled

Enter Main Menu then Weighing Units to

set the appropriate unit on.

RS232, USB or

Ethernet

interface not

working

Balance communications settings do

not match with the settings in the

connected computer.

See User Manual for proper settings

Poor Cable connection

Check cable connection

Defective Interface or cable

Replace

Low Reference

weight

Reference weight is too small

Increase reference weight or continue

with less accurate results.

Invalid Piece

Weight

Parts counting– average piece weight is

too small.

Shows error – returns to re-establish the

APW.

Operation

Timeout

Weight reading not stable

See above - Incorrect weight reading

Busy (tare, zero, printing)

Retry after completion

Pressing “Print”

or command “P”

do not work

immediately

RS232, USB or Ethernet interface not

working

see above – RS232, USB or Ethernet

interface not working

Print settings enable the stable print,

but there is unstable environment-

vibration, air currents or changing

temperature

Move balance to suitable location, allow

balance to stabilize its temperature; or

set “Main Menu -> Communication ->

RS232/USB/Ethernet -> Print Settings ->

Print Output -> Stable Weight Only” to

OFF

Overload

Weight on pan exceeds capacity

Remove weight from pan

Underload

Pan is removed during weighing

Re-install pan

Over initial zero

range

Pan has load during power on

Remove weight from pan and re-zero.

Under initial

zero range

Pan was removed prior to power on

Install pan and re-zero.

IDNR error

Type data error

Contact the authorized dealer

--operation not

allowed--

There is no sample on the pan when

doing Tare

Place sample on the pan and redo Tare

Ohaus Corporation www.ohaus.com 15 Explorer 5 Semi-Micro Balances

Shortcut buttons

are gray and no

action when

pressing them.

The current application is in procedure.

Cancel the procedure first.

Does not retain

the correct time

and date.

Battery backup for the real time clock

has lost its charge.

Replace the real time clock battery on the

Base Main PCBA, see 3.4.2

Note: There is 40-second timeout control for print under stable requirement. If the unstable

condition continues over 40 seconds, balance will send “ES” to the printer.

Ohaus Corporation www.ohaus.com 16 Explorer 5 Semi-Micro Balances

3 MAINTENANCE / REPAIR PROCEDURES

3.1 PREVENTIVE MAINTENANCE

Ohaus balances 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 balance 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.

*Do not leave a mass on the balance when the balance is not in use.

*Allow time for the balance to stabilize after moving it from an area which is at a different

temperature than the area where it is to be operated. Allow one hour for each 5°F (2°C)

temperature change before using the balance. After temperature stabilization, allow an additional

60 minutes after turning the balance on, for the balance electronics to stabilize.

Preventive Maintenance Checklist

The balance should be inspected and checked regularly, as follows:

1 Remove the Pan and Sub Pan to inspect and clean the area beneath the Pan.

2 Clean the outside of the balance using a damp cloth with warm water.

3 Check the Power Cord for broken or damaged insulation.

4 Make a visual inspection for faulty connectors, wiring, and loose hardware.

3.2 OPENING THE BALANCE

Opening the Explorer® balance varies slightly according to the specific model, as detailed below. Use these

procedures in order to replace the Load Cell, the Printed Circuit Board or other components.

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

3.2.1 Preparation for Opening Explorer® Models

1 Turn the balance off and unplug the power cord before you begin.

2 Disconnect any communication or other option cables.

3 Removing the Glass Shelf

CAUTION

DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE.

SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE BALANCE’S FINISH.

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Ohaus Explorer User manual

Ohaus Explorer User manual

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