OHAUS EXPLORER User manual

OhausCorporation19AChapinRoad,P.O.Box2033,PineBrook,NJ07058-2033(973)377-9000
SERVICE MANUAL
EXPLORER® BALANCES
EXPLORER®PRO BALANCES
VOYAGER®BALANCES

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.
Material in this manual is subject to change.
© Copyright 2003 Ohaus Corporation, all rights reserved.
® Registered trademark of Ohaus Corporation.
SERVICE MANUAL
EXPLORER®BALANCES
EXPLORER®PRO BALANCES
VOYAGER®BALANCES
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PRECISION HIGH CAPACITY ANALYTICAL
PRECISION HIGH CAPACITY ANALYTICAL
PRECISION HIGH CAPACITY ANALYTICAL
Explorer®
Explorer Pro®
Voyager®

i
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
1.1 Introduction ..........................................................................................1-1
1.2 Service Facilities ....................................................................................1-2
1.3 Tools and Test Equipment Required ......................................................1-3
1.3.1 Special Tools..................................................................................1-3
1.3.2 Standard Tools and Test Equipment ..............................................1-3
1.4 Test Masses Required............................................................................1-3
1.5 Specifications .........................................................................................1-4
CHAPTER 2 DIAGNOSIS
2.1 Troubleshooting......................................................................................2-1
2.2 Diagnostic Guide ....................................................................................2-1
2.2.1 Diagnosis........................................................................................2-1
2.3 Explorer / Voyager Error Code Table......................................................2-3
2.4 Explorer Pro Error Code Table ...............................................................2-5
CHAPTER 3 REPAIR PROCEDURES
3.1 Repair Procedures..................................................................................3-1
3.1.1 Analytical Load Cell Removal ........................................................3-1
3.1.2 Analytical Load Cell Replacement..................................................3-2
3.1.3 Analytical Load Cell Position Sensor Adjustment...........................3-3
3.1.4 Analytical Load Cell Position Sensor Adustment Without Test Points 3-4
3.1.5 Analytical Load Cell Load Flexure (Vertical Link) Removal............3-4
3.1.6 Analytical Load Cell Load Flexure (Vertical Link) Installation.........3-4
3.1.7 Analytical Load Cell Upper Flexure Arm and Lower Flexure Arm
Removal/ Installation ......................................................................3-5
3.1.8 Removing the Lever and Coil .........................................................3-6
3.1.9 Replacing the Vertical Flexures (Pillow Block Bearings)................3-6
3.1.10 Replacing the Lever and Coil .........................................................3-7
3.1.11 Monoblock Load Cell Removal Precision Top Loader Balance and
Analytical ........................................................................................3-7
3.1.12 Monoblock Load Cell Replacement for Precision Top Loader
and Analytical Balances .................................................................3-8
3.1.13 Position Sensor Assembly Removal from Monoblock in Precision......
Top Loader Balance .......................................................................3-9
3.1.14 Installing the Position Sensor Assembly for Monoblock Precision
Top Loader Balance .....................................................................3-10
3.1.15 Changing the Load Cell Board Precision Top Loader Balance ....3-10
3.1.16 Removing the Force Coil Lever from Monoblock in Precision Top
Loader Balance ............................................................................3-11
3.1.17 Installing the Force Coil Lever Assembly in Monoblock for Precision..
Top Loader Balance .....................................................................3-12
3.1.18 Vertical Stop Adjustment for Monoblock in Precision Top Loader
Balance ........................................................................................3-13
Page No.

ii
TABLE OF CONTENTS (Cont.)
3.1.19 Monoblock Load Cell Removal from High Capacity Top Loader
Balance ........................................................................................3-14
3.1.20 Calibration Motor Removal from High Capacity Top Loader
Balance ........................................................................................3-14
3.1.21 Position Sensor Assembly Removal from Monoblock in High
Capacity Top Loader Balance ......................................................3-15
3.1.22 Installing the Position Sensor Assembly for Monoblock High Capacity
High Capacity Top Loader Balance..............................................3-15
3.1.23 Removing the Force Coil Lever assembly from Monoblock in
High Capacity Top Loader Balance..............................................3-15
3.1.24 Installing the Force Coil Lever Assembly in Monoblock in High
Capacity Top Loader Balance ......................................................3-16
3.1.25 Installing Monoblock and Assembling Position Sensor for High
Capacity Top Loader Balance ......................................................3-16
3.1.26 Changing Servomotor on High Capacity Top Loader Balance .....3-17
3.1.27 Vertical Stop Adjustment for Monoblock in High Capacity Top
Loader Balance ............................................................................3-18
3.2 Replacement of Major Components......................................................3-19
3.2.1 Analytical Balances Main Printed Circuit Board (PCB).................3-19
3.2.2 Analytical Balance Position Sensor PC Board .............................3-21
3.2.3 Precision Top Loader Balances Main Printed Circuit board (PCB)3-21
3.2.4 High Capacity Top Loader Balance Main Printed Circuit Board (PCB)
and Power Supply (PCB)..............................................................3-23
3.2.5 High Capacity Top Loader Balance Connector Printed Circuit
Board (PCB) .................................................................................3-24
3.2.6 Removing the Display Module on Explorer Precision Top Loader
Balances.......................................................................................3-24
3.2.7 Removing the Display Module on Explorer High Capacity Top
Loader Balances...........................................................................3-25
3.2.8 Display Printed Circuit Board........................................................3-26
3.2.9 Membrane Switch Replacement...................................................3-27
3.2.10 Replacing the Display...................................................................3-28
3.2.11 Removing the Display Module Voyager and Explorer Pro Models3-29
3.2.12 Display PCB/LCD Assembly Replacement ..................................3-30
3.2.13 Bulb Replacement ........................................................................3-31
CHAPTER 4 TESTING
4.1 Testing ..........................................................................................4-1
4.1.1 Operational Test .............................................................................4-1
4.1.1.1 Segment Display Test .......................................................4-1
4.2 Performance Tests All Balances.............................................................4-2
4.2.1 Precision/Repeatability Test...........................................................4-2
4.2.2 Off-Center Load Test.......................................................................4-2
4.2.3 Linearity Test ..................................................................................4-8
4.2.4 RS232 Communication Test...........................................................4-9

iii
CHAPTER 5 DRAWINGS AND PARTS LISTS
5-1 Drawings and Parts Lists ........................................................................5-1
5-2 Parts Lists .... .........................................................................................5-3
5.2.1 Precision Top Loader Base Parts List............................................ 5-3
5.2.2 Analytical Base Parts List ...............................................................5-5
5.2.3 Precision Top Loader Base Parts List.............................................5-7
5.2.4 Analytical Load Cell Parts List ........................................................5-9
5.2.5 Precision Top Loader Monoblock Load Cell Parts List .................5-11
5.2.6 High Capacity Top Loader Balance Parts List ..............................5-13
5.2.7 High Capacity Top Loader Balance Parts List ..............................5-15
5.2.8 Monoblock High Capacity Top Loader Balance Parts List............5-17
5.2.9 Explorer Display Parts List............................................................5-19
5.2.10 Explorer High Capacity Parts list ..................................................5-21
5.2.11 Explorer Pro, Voyager Display Parts List......................................5-23
5.2.12 Voyager, Explorer Pro, High Capacity Parts List ..........................5-25
APPENDIX A - EXPLORER EP LOADER
A.1 Requirements for EP Loader.................................................................. A-1
A.2 Limitations ......................................................................................... A-1
A.3 Installing EP Loader Software................................................................ A-1
A.4 Run EP Loader Software ....................................................................... A-1
A.5 Setup the Balance in Manufacturing Mode ............................................ A-2
A.6 Connect the Balance to a PC................................................................. A-2
A.7 Personality Data Label Entry ................................................................. A-3
A.8 Temperature Compensation (TC) Data Entry ........................................ A-5
A.9 Downloading Personality Data and/or TC Data into the Balance .......... A-7
A.10Saving Personality Data and TC Data ................................................... A-7
A.11Opening Data Files................................................................................ A-7
A.12Clear EP Loader .................................................................................... A-7
A.13Confirm TC Download ........................................................................... A-7
APPENDIX B - EXPLORER PRO EP LOADER
B.1 Requirements for EP Loader.................................................................. B-1
B.2 Installing EP Loader Software................................................................ B-1
B.3 Run EP Loader Software ....................................................................... B-1
B.4 Setup the Balance in Manufacturing Mode ............................................ B-2
B.5 Connect the Balance to a PC................................................................. B-3
B.6 Temperature Compensation (TC) Data Entry ........................................ B-3
B.7 Personality Data label Entry .................................................................. B-6
B.8 Downloading Personality Data and/or TC Data into the Balance .......... B-8
B.9 Saving Personality Data and TC Data ................................................... B-8
B.10Opening Data Files................................................................................ B-8
B.11Clear EP Loader .................................................................................... B-8
B.12Confirm TC Download ........................................................................... B-8
TABLE OF CONTENTS (Cont.)

iv
LIST OF TABLES
TABLE NO. TITLE PAGE NO.
1-1 Calibration Points ..............................................................................1-3
1-2 Analytical Specifications ...................................................................1-4
1-3 Precision Top Loader Specifications.................................................1-4
1-4 High Capacity Top Loader Specifications .........................................1-4
2-1 Diagnostic Guide...............................................................................2-2
2-2 Explorer Voyager Error Codes ..........................................................2-3
2-3 InformationMessages .......................................................................2-4
2-4 Explorer Pro Error codes ...................................................................2-5
4-1 Types of Performance Tests..............................................................4-2
4-2 Center Load Test Masses..................................................................4-8
5-1 Precision Top Loader Base Parts List ...............................................5-3
5-2 Analytical Base Parts List..................................................................5-5
5-3 Precision Top Loader Base Parts List ...............................................5-7
5-4 Analytical Load Cell Parts List...........................................................5-9
5-5 Precision Top Loader Monoblock Load Cell Parts List....................5-11
5-6 High Capacity Top Loader Balance Parts List (Sheet 1) .................5-13
5-6 High Capacity Top Loader Balance Parts List (Sheet 2) .................5-15
5-7 Monoblock High Capacity Top Loader Parts List ............................5-17
5-8 Explorer Display Parts List ..............................................................5-19
5-9 Explorer High Capacity Parts List....................................................5-21
5-10 Explorer Pro, Voyager Display Parts List.........................................5-23
5-11 Voyager, Explorer Pro, High Capacity Parts List .............................5-25
TABLE OF CONTENTS (Cont.)
APPENDIX C - PRODUCTION MODE CALIBRATION
C.1 Preparation ......................................................................................... C-1
C.2 Manufacturing Calibration (MFg) Procedure .......................................... C-1
C.3 Manufacturing Weight Calibration (MFgWt) Procedure.......................... C-2
APPENDIX D - REPLACING BOTTOM DISPLAY BOARD
D.1 Replacing the Bottom Display Board on Voyager, Explorer Pro and Voyager
Pro Balance ......................................................................................... D-1
D.2 Explorer Pro, Voyager and Voyager Pro flash Instructions .................... D-1

v
TABLE OF CONTENTS (Cont.)
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE PAGE NO.
3-1 Analytical Sensor Board Adjustment Locations and Connections.....3-3
3-2 Analytical Sensor Board Adjustment .................................................3-4
3-3 Removing the Vertical Flexure ..........................................................3-4
3-4 Installing Vertical Flexure ..................................................................3-4
3-5 Installing the Shims ...........................................................................3-5
3-6 Hanger Positioning............................................................................3-5
3-7 Lever Removal/IInstallation ...............................................................3-6
3-8 Vertical Guide (Pillow Block Bearing) Installation .............................3-6
3-9 Installing Lever and Coil....................................................................3-7
3-10 Removing Position Sensor Assembly from Monoblock ....................3-9
3-11 Position Sensor Assembly Mounting...............................................3-10
3-12 Changing Load Cell Board..............................................................3-10
3-13 Monoblock Assembly ......................................................................3-11
3-14 Contact Board Removal ..................................................................3-11
3-15 Force Coil Removal.........................................................................3-11
3-16 Force Coil Lever Installation............................................................3-12
3-17 Monoblock Mounting .......................................................................3-12
3-18 Position Sensor Connections ..........................................................3-13
3-19 Calibration Motor Removal..............................................................3-14
3-20 Position Sensor Assembly Mounting...............................................3-15
3-21 Force Coil Removal.........................................................................3-15
3-22 Force Coil Lever Installation............................................................3-16
3-23 Installation Monoblock and Position Sensor....................................3-16
3-24 Servomotor Installation....................................................................3-17
3-25 Position Sensor Connections ..........................................................3-18
3-26 Display Removal/Installation for Explorer Precision Top Loader
Balance ........................................................................................3-25
3-27 Display Removal/Installation for Explorer High Capacity Top Loader
Balance ........................................................................................3-26
3-28 Rear View of Display PCB Assembly..............................................3-27
3-29 Membrane Switch Cable Routing....................................................3-28
3-30 Display Removal/Installation...........................................................3-29
3-31 Rear View of Display PCB Assembly..............................................3-30
3-32 LCD Assembly Bulb Replacement ..................................................3-32
4-1 Segment Display ...............................................................................4-1
4-2 LFT Displays .....................................................................................4-1
4-3 Countdown Display ...........................................................................4-1
4-4 Analytical Off-Center Load Adjustments Diagram .............................4-3
4-5 Monoblock Off-Center Load..............................................................4-4
4-6 Monoblock Adjustments ....................................................................4-6

vi
TABLE OF CONTENTS (Cont.)
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE PAGE NO.
5-1 Overall Exploded View of Precision Top Loader Balance.................5-2
5-2 Overall Exploded View of Analytical Balance ...................................5-4
5-3 Exploded View of Precision Top Loader Base Assembly..................5-6
5-4 Exploded View of Analytical Load Cell .............................................5-8
5-5 Exploded View of Monoblock Load Cell for Precision Top Loader..5-10
5-6 Overall Exploded of High Capacity Top Loader Balance (Sht 1).....5-12
5-6 Overall Exploded of High Capacity Top Loader Balance (Sht 2).....5-14
5-7 Exploded View of Monoblock Load Cell for High Capacity Top
Loader Balance ...............................................................................5-16
5-8 Exploded View of Explorer Display .................................................5-18
5-9 Exploded View of Explorer High Capacity Display..........................5-20
5-10 Exploded View of Explorer Pro, Voyager Display ...........................5-22
5-11 Exploded View of Voyager, Explorer Pro High Capacity Display....5-24
A-1 RF Shield ......................................................................................... A-3
A-2 Personality Data ............................................................................... A-3
A-3 TC Data ......................................................................................... A-5
B-1 RF Shield ......................................................................................... B-2
B-2 TC Data ......................................................................................... B-3
B-3 Personality Data ............................................................................... B-6

1-1
CHAPTER 1 INTRODUCTION
1.1 INTRODUCTION
ThisservicemanualcontainstheinformationneededtoperformroutinemaintenanceandserviceontheOhausExplorer®,
ExplorerPro®andVoyager®balances. Therearethreebasicconfigurationsofbalances:Analytical,PrecisionTopLoader
and High Capacity Top Loader. The High Capacity Top Loader balances are rated from 12,000 grams to 32,000 grams
capacityandcontaindifferentcomponentsthanthelowercapacityPrecisionTopLoaderbalances. Theproceduresinthis
manualassumethetechnicianperformingthemhasaworkingknowledgeoftheuseofstandardhandtoolsandtherepair
and use of precision instruments.
TheservicestrategyforExplorerbalancesisthereplacementofPCboards,membraneswitchesandmostcaseparts. The
transducers are to be repaired. Only parts listed in the parts list are replaceable.
To service an Explorer Pro or Voyager balance, the display module must be removed and an Explorer display module
substituted. This is required in order to use the service software that is in the processor that is located on the Main PCB.
Seeillustrationbelow.
Explorer
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Explorer Pro Voyager
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ANALYTICAL ANALYTICAL
HIGHCAPACITY HIGHCAPACITY HIGHCAPACITY
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1-2
CHAPTER 1 INTRODUCTION
1.1 INTRODUCTION (Cont.)
The contents of this manual is contained in five chapters with three appendices.
Chapter1Introduction-Containsinformationregardingservicefacilities,tools,testequipment,calibrationmasses
and specifications.
Chapter2 Diagnosis- Containsadiagnosticguidefortroubleshootingproblemsanderrorcodetables.
Chapter3RepairProcedures-Containsdisassembly/assemblyandreplacementprocedures.
Chapter 4 Testing - Contains an operational test, a segment display test and performance tests.
Chapter 5 Drawings and Parts Lists - Contains exploded view drawings with associated parts lists.
Appendix A Explorer EP Loader-Containsinformationonloadingsoftwareto place the Explorer balance in a
manufacturingmodetodownloadtemperatureandpersonalitydata.
AppendixB Explorer ProEP Loader-Containsinformation onloading softwaretoplacetheExplorer Probalance
inamanufacturingmodetodownloadtemperatureandpersonalitydata.
AppendixCProductionModeCalibration-Containscalibrationinformationinaproductionmode.
Beforeservicingthebalance,youshouldbefamiliarwiththeInstructionManualwhichispackedwitheverybalance.
1.2 SERVICE FACILITIES
DONOT SERVICEthe balance:
•Nexttoopen windows ordoorscausing drafts orrapidtemperature changes.
•Nearairconditioningor heat vents.
•Nearvibrating,rotatingorreciprocatingequipment.
•Nearmagneticfieldsorequipmentthatgenerates magnetic fields.
•On an unlevel work surface.
•Allow sufficient space around the instrument for ease of operation and keep away from
radiatingheatsources.
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OHAUS
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1-3
CHAPTER 1 INTRODUCTION
1.3 TOOLS AND TEST EQUIPMENT REQUIRED
InordertoproperlyservicetheOhausExplorerbalances,certainOhausspecialtoolsandtestitemsarerequiredinaddition
to standard electronic tool kits. These items are listed as follows:
1.3.1 Special Tools
1. 476000-03 Monoblock service tool kit
2. 476001-02 Analytical service tool kit
3. 11108525 Explorer Display Module, Capacities to 8kg
4. 450111-010 ExplorerDisplayModule, Capacitiesover12kg
5. AS017-09 Interface cable 9 Pin or AS017-02 Interface cable 25 Pin.
1.3.2 Standard Tools and Test Equipment
1. Digital Voltmeter (DVM) - Input impedance of at least 10 megohms in the 1 Volt dc position.
2. Torx driver Set
3. Torque wrench (optional) with a Phillips head bit, Tork bits, Allen bits, SAE and Metric
4. Box wrench, 7mm
5. Nutdriver,3/16"
6. Hex or Allen key wrenches, 7/16", 9/64" or 3/32", M3 SAE and Metric Set
7. Otherassorted hand tools, tweezers, adjustable openwrenches,etc.
8. Solderingiron (50 watt) and solder(rosincoresolder, not acid core).
9. Solderremover.
10. Computer with at least 1 com port.
11. AcommunicationsprogramsimiliartoHyperTerminal(suppliedwithWindows).
1.4 TEST MASSES REQUIRED
Themassesrequired to test the Ohaus Explorer balances must meet the requirements of ASTM Class 1 Tolerance. The
calibration points are listed in Table 1-1. Use the least number of masses to reach the total.
TABLE 1-1. CALIBRATION POINTS
LINEARITY SPAN
CAPACITY MASSES TOTALING MASSESTOTALING
62g 20g/50g 50g
110g 50g/100g 100g
210g 100g/200g 200g
410g 200g/400g 400g
610g 200g/500g 500g
2100g 1000g/2000g 2000g
4100g 2000g/4000g 4000g
6100g 2000g/5000g 5000g
8100g 4000g/8000g 8000g
12000g 5000g/10000g 10000g
22000g 10000g/20000g 20000g
32000g 15000g/30000g 30000g

1-4
CHAPTER 1 INTRODUCTION
Capacity (g) 210 410 100/410 610 2100 4100 1000/4100 4100 6100 8100
Readability (g) 0.001 0.001/0.01 0.01 0.01/0.1 0.1
Repeatability (Std. dev.) (g) 0.0005 0.0005/0.005 0.005 0.01/0.05 0.05
Linearity (g) (+) 0.002 0.002/0.005 0.02 0.02/0.05 0.1
Tare range Full capacity by subtraction
Stabilization time <3 seconds
Sensitivity drift PPM/°C 4 3 4 3 4 3 4 3
(10°C - 30°C)
Operating temperature range: ..................
w/internal calibration 10° to 40°C/50° to 104°F ..................
w/o internal calibration 10° to 30°C/50° to 86°F ..................
Power requirements External Adapter, 100-120 V ac, 220 V ac, 50/60 Hz
Plug configuration for US, Euro, UK & Australia
TABLE 1-3. PRECISION TOP LOADER SPECIFICATIONS
Capacity (g) 62 110 210 100/210
Readability (mg) 0.1 0.1/1
Repeatability (Std. dev.) (mg) 0.1 0.1/0.5
Linearity (mg) (+) 0.2 0.2/0.5
Tare range Full capacity by subtraction
Safe overload capacity 150% of capacity
Stabilization time <4 seconds
Sensitivity drift PPM/°C 3 ..................
(10°C - 30°C)
Operating temperature range: ..................
w/internal calibration 10° to 40°C/ 50° to 104°F ..................
w/o internal calibration 10° to 30°C/50° to 86°F
Power requirements External Adapter, 100-120 V ac, 220 V ac, 50/60 Hz
Plug configuration for US, Euro, UK & Australia
1.5 SPECIFICATIONS
Completespecificatons forthe OhausExplorer balances arelisted in Tables1-2,1-3 and1-4. Whena balancehasbeen
serviced, it must meet the specifications listed in the table. Before servicing the balance, determine what specifications
are not met.
Capacity (g) 12,000 22,000 32,0000
Readability (g) 0.1
Repeatability (Std. dev.) (g) 0.1
Linearity (g) (+) 0.4
Tare range Full capacity by subtraction
Safe overload capacity 150% of capacity
Stabilization time <4 seconds
Sensitivity drift PPM/°C 3 ..................
(10°C - 30°C)
Operating temperature range: ..................
w/internal calibration 10° to 40°C/ 50° to 104°F ..................
w/o internal calibration 10° to 30°C/50° to 86°F
Power requirements External Adapter, 100-120 V ac, 220 V ac, 50/60 Hz
Plug configuration for US, Euro, UK, Japan & Australia
TABLE 1-4. HIGH CAPACITY TOP LOADER SPECIFICATIONS
TABLE 1-2. ANALYTICAL SPECIFICATIONS

2-1
CHAPTER 2 DIAGNOSIS
2.1 TROUBLESHOOTING
This section of the manual specifies problem areas of the balance which can occur. Information is contained to isolate
specific problems using Table 2-1, Diagnostic Guide, and Error Codes, Tables 2-2 through 2-4. Follow all directions step
by step. Make certain that the work area is clean and use care when handling components of the balance.
2.2 DIAGNOSTIC GUIDE
Table 2-1 is a diagnostic guide designed to help locate the problem area quickly and easily. To use the table, first locate
thesymptomthatyouareobserving. Followthe symptomcolumnandreviewtheprobablecausecolumnandremedycolumn.
Theprobablecauses arelistedwith the mostcommoncause first. If thefirstremedy doesnotfixthe problem,proceedon
tothenextremedy. Beforeattemptingtorepairthebalance,readallchaptersofthismanualtofamiliarizeyourselfwiththe
balance components and operation. Do not attempt repairs unless you fully understand the operation of the balance.
2.2.1 Diagnosis
1.Isolate and identify the symptom.
2.Refer to Table 2-1 Diagnostic guide and locate the symptom.
3.Followthesuggestedremedies in the order that theyappear.
4.Perform the indicated checks, or see the appropriate section of the manual.
5.Repair or replace the defective section of the balance.
NOTE:
Ifmorethanonesymptomisobserved,itis necessary to approach one
area at a time, and also remember, that the symptoms may be interre-
lated.
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:
OhausCorporation
19AChapinRoad
P.O. Box 2033
PineBrook,NJ 07058-2033USA
Tel: [phone]
Fax:[phone]
In the United States call toll free, 800-526-0659 between 8:00 a.m. and 5:30 p.m. EST.

2-2
CHAPTER 2 DIAGNOSIS
PROBABLECAUSE(S)
Powercordnotpluggedinorproperly
connected to balance or defective.
Displaymodule notconnectedprop-
erly.
Defective display PC Board.
Defectivemembraneswitch.
IC U11 defective.
Display module cable defective.
Internal cables may be touching a
moving part of the transducer.
Weigh below cover may have col-
lecteddebrisandistouchinginternal
hook.
Defectivemembraneswitch.
Zerohaschanged.
Defectivepowersupplyboard.
Defectivemembraneswitch.
Defectivepowersupplyboard.
Defective cable.
Defectivemembraneswitch.
Balance was not re-zeroed before
weighing.
Balancenotproperlycalibrated.
Defective/damagedTransducer.
Print menu settings not properly set
up.
Cableconnections.
Defective main PC Board.
Microprocessor locks up.
Defective main PC Board.
Defective Display PC Board.
SYMPTOM
Unit will not turn on.
Balance drifts.
WhenbalanceisturnedON,"CAL"
shows on the display.
Error3.0onahighcapacity(12000g-
32000g)balance.
Highcapacity(12000g-32000g)bal-
ance will not turn on.
VoyagerLowandHighcapacityunits
start in Print menu.
Incorrectweightreading.
RS232interfacenotworking.
Randomsegmentsdisplayedordis-
play locks up.
REMEDY
Check/replace power cord connec-
tions.
Checkdisplaymoduleconnections.
Replacedisplay PCBoard.
Replacemembraneswitch.
ReplaceICU11.
Replacecable.
Re-routecables.
Cleanorreplacecover.
Replacemembraneswitch.
Performmanufacturingcalibration.
Replacepowersupplyboard.
Replacemembraneswitch.
Replacepowersupplyboard.
Replacecable.
Replacemembraneswitch.
Press
O/T
withnoweightonthe
pan,thenweighitem.
Recalibratecorrectly.
Troubleshoot&repairTransducer.
Verify interface settings in RS232
menucorrespondtothoseofperiph-
eraldevice.
Checkcableconnections.
ReplacemainPCBoard.
Turnpoweroff,thenturnonagain.If
condition persists, unit must be ser-
viced.
ReplacemainPCboard.
ReplaceDisplay PCBoard.
TABLE 2-1. DIAGNOSTIC GUIDE

2-3
CHAPTER 2 DIAGNOSIS
TABLE 2-1. DIAGNOSTIC GUIDE (Cont.)
Unstablereadings.
Errormessagedisplay.
Excessive air currents.
Vibrationontablesurface.
Defective/damagedTransducer.
Defective main PC Board.
Checkenvironmentalconditions.
Place balance on a stable surface
orchangeaveraginglevel.
Troubleshoot&replaceTransducer.
ReplacemainPCBoard.
See Error Codes list.
REMEDY
PROBABLECAUSE(S)SYMPTOM
2.3 EXPLORER / VOYAGER ERROR CODE TABLE
TheExplorerandVoyagerbalancesareequippedwithsoftwarewhichwilldisplayanerrorconditionwhenitoccurs. Table
2-2 Explorer/Voyager Error Codes, describes the various error codes which can appear on the display and specifies the
probable reason and remedy. Table 2-3 lists the error messages that can appear on the display. Table 2-4 lists the error
codes for the Explorer Pro balance.
TABLE 2-2. EXPLORER VOYAGER ERROR CODES
DisplaysError 1.0
Usually caused by static discharge. If the error persists replace the PCB.
DisplaysError 1.1
Temperaturechanneldutycycleoutofrange.Failedtemperaturesensororbrokenwirebetweenthetemperaturesensor
and the PCB.
DisplaysError 2.0
Unabletostabilizewithintimelimitafter pressing the tare button. Look for something touching any moving part ofthe
transducer. Could be a problem with the transducer itself.
Displays Err 3.0
Thezerohaschangedenoughtomaketheinternalcalibrationdataincorrect-performMFG andMFGWTiftheunithas
internalcalibration(AutoCal).
DisplaysError 3.1
Unabletoget stable dataduringan internal calibration.
1. Wasthebalancewarmedup?
2. Doesthe balance repeat?Thiswouldindicate a problem withthetransducer.
Place a draft shield over the balance
Displays Err 3.2
Incal motor has not stopped in time. Check motor, motor control and weight positioning setup.
Displays Error 8.0 & Error 8.1
This is a hardware error. It could be caused by the PCB, Transducer or the inter-connections.
Displays Err 8.3
Power on load out of range – Overload, extra weight on pan.
Displays Err 8.4
Power on load out of range - Pan missing or wrong pan that is too light.

2-4
CHAPTER 2 DIAGNOSIS
Displays Err 8.5
Internalcalibrationweightsensorindicates theweightisonthepan,Checktheconnectionbetweenthecalibration
unit and the main PCB. Could be a problem with the calibration mechanism or the main PCB.
Displays Err 9.1
Personalitydata corrupt.Reloadusing EPLoader.
Displays Err 9.2
Serialnumberdoesnotmatch.TheserialnumberchipU10wasnottransferredtoanewPCB.IfthecorrectU10
can not be found the main PCB must be replaced with a configured PCB.
Displays Err 9.3
Serial number does not match. Unplug and try again. If that fails reload personality data using EP Loader.
Displays Err 9.4
Factoryinternalcalibrationdatafailedchecksum.PerformMFGandMFGWT.Iftheproblempersistsreloadthe
TC data. If the problem still persists the main PCB must be reconfigured at Ohaus.
Displays Err 9.5
Factorycalibrationdatafailedchecksum.PerformMFGandMFGWT.IftheproblempersistsreloadtheTCdata.
If the problem still persists the main PCB must be reconfigured at Ohaus.
Displays Err 9.8
Usercalibrationdatafailedchecksum.PerformMFGCalibration.Forunitswithinternalcalibrationalsoperform
MFGWT.
Displays Err 9.9
Can not be fixed in the field, the unit has to be temperature compensated.
TABLE 2-2. EXPLORER VOYAGER ERROR CODES (Cont.)
TABLE 2-3. INFORMATION MESSAGES
CALNOW IfInCALTM (internalcalibration)isinstalled. Messagetorecalibratethebalance. Themessagewillremain
untilcalibrated.
WARMUP Theusertriedtoperformaninternalcalibrationandthismessagewillbeflashedinthe14segmentfield.
Thebalancerequiresa7minutewarm-upperiod. Duringwarm-up,theusercannotselectInCALTMfrom
themenu.
SAVED This message is flashed when an item is changed in the menu and the new value is written to the
EEPROM.
LOCKED Thismessageisflashedwhenanitemcannotbechangedinthemenu,becausethemenuislockedand
the Lock Switch is set locked.
LOWREF The message is flashed in parts counting or percent when the calculated reference weight is very low.
2.3 EXPLORER / VOYAGER ERROR CODE TABLE (Cont.)

2-5
CHAPTER 2 DIAGNOSIS
DisplaysError 1.0
Usually caused by static discharge. If the error persists replace the PCB
DisplaysError 1.1
Temperaturechanneldutycycleoutofrange.Failedtemperaturesensororbrokenwirebetweenthetemperature
sensor and the PCB
DisplaysError 2.0
Unabletostabilize within timelimitafter pressing thetarebutton. Look forsomethingtouchingany movingpart
of the transducer. Could be a problem with the transducer itself.
Displays Err 3.0
Thezerohaschangedenoughtomake theinternalcalibrationdataincorrect-perform MFGandMFGWTifthe
unithasinternalcalibration(AutoCal).
DisplaysError 3.1
Unabletoget stable dataduringan internal calibration.
1. Wasthebalancewarmedup?
2. Doesthe balance repeat?Thiswouldindicate a problem withthetransducer.
Place a draft shield over the balance
Displays Err 3.2
Incal motor has not stopped in time. Check motor, motor control and weight positioning setup.
Displays Error 8.0 & Error 8.1
This is a hardware error. It could be caused by the PCB, Transducer or the inter-connections.
Displays Err 8.3
Power on load out of range – Overload, extra weight on pan.
Displays Err 8.4
Power on load out of range - Pan missing or wrong pan that is too light.
Displays Err 8.5
Internalcalibrationweightsensorindicates theweightisonthepan,Checktheconnectionbetweenthecalibration
unit and the main PCB. Could be a problem with the calibration mechanism or the main PCB.
Displays Err 9.1
Personalitydata corrupt.Reloadusing EPLoader.
Displays Err 9.2
Serialnumberdoesnotmatch.TheserialnumberchipU10wasnottransferredtoanewPCB.IfthecorrectU10
can not be found the main PCB must be replaced with a configured PCB.
Displays Err 9.3
Serial number does not match. Unplug and try again. If that fails reload personality data using EP Loader.
2.4 EXPLORER PRO ERROR CODE TABLE
TABLE 2-4. EXPLORER PRO ERROR CODES

2-6
CHAPTER 2 DIAGNOSIS
TABLE 2-4. EXPLORER PRO ERROR CODES (Cont.)
Displays Err 9.4
Factoryinternalcalibrationdatafailedchecksum.PerformMFGandMFGWT.IftheproblempersistsreloadtheTCdata.
If the problem still persists the main PCB must be reconfigured at Ohaus.
Displays Err 9.5
Factorycalibrationdatafailedchecksum.PerformMFGandMFGWT.IftheproblempersistsreloadtheTCdata.Ifthe
problem still persists the main PCB must be reconfigured at Ohaus.
Displays Err 9.8
Usercalibrationdatafailedchecksum.PerformMFGCalibration.ForunitswithinternalcalibrationalsoperformMFGWT.
Displays Err 9.9
Can not be fixed in the field the unit has to be temperature compensated.
2.4 EXPLORER PRO ERROR CODE TABLE (Cont.)