
TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com i Valor™2000 Series Service Manual
Page No.
CHAPTER 1 GETTING STARTED
1.1 Introduction..............................................................................................................1-1
1.2 Service Facilities......................................................................................................1-1
1.3 Tools and Test Equipment Required........................................................................1-1
1.4 Specifications...........................................................................................................1-3
1.5 Scale Operation.......................................................................................................1-4
1.5.1 Overview of the Controls...................................................................................1-4
1.5.2 Power On..........................................................................................................1-5
1.5.3 Power Off..........................................................................................................1-5
1.5.4 Menu Setup ......................................................................................................1-6
1.5.5 Menu Navigation...............................................................................................1-6
1.6 Legal For Trade .......................................................................................................1-7
CHAPTER 2 TROUBLESHOOTING
2.1 Troubleshooting .......................................................................................................2-1
2.2 Diagnostic Guide......................................................................................................2-1
2.2.1 Diagnosis..........................................................................................................2-1
2.2.2 Checking Load Cells for Trouble.......................................................................2-2
2.2.3 Testing the Printed Circuit Board (PCB)............................................................2-4
2.2.4 Diagnostic Guide...............................................................................................2-6
CHAPTER 3 MAINTENANCE PROCEDURES
3.1 Preventive Maintenance...........................................................................................3-1
3.1.1 Preventive Maintenance Checklist....................................................................3-1
3.2 Service Strategy.......................................................................................................3-1
3.3 Opening the Scale....................................................................................................3-1
3.2.1 Separating the Top and Bottom Housings.........................................................3-2
3.2.2 Removing the Component Covers and Lifting Out the Cable Plugs ..................3-3
3.4 Removing/Replacing the Main Printed Circuit Board (PCB) .....................................3-3
3.5 Replacing the Rear Display PCB..............................................................................3-4
3.6 Removing/Replacing the Load Cell..........................................................................3-4
3.7 Cable Set Replacement ...........................................................................................3-5
3.8 Replacing the Battery...............................................................................................3-5
3.9 Replacing the Gaskets.............................................................................................3-5
3.10 Setting/Removing Legal-For-Trade..........................................................................3-6
3.11 Replacing the Function Label...................................................................................3-6
CHAPTER 4 TESTING
4.1. Testing.....................................................................................................................4-1
4.1.1 Test Masses Required......................................................................................4-1
4.2 Operational Test ......................................................................................................4-1
4.3 Segment Display Test..............................................................................................4-1
4.4. Performance Tests...................................................................................................4-2
4.4.1 Precision Test...................................................................................................4-2
4.4.2 Repeatability Test.............................................................................................4-3
4.4.3 Linearity Test....................................................................................................4-5
4.4.4 Off-Center Load Test........................................................................................4-5
4.4.5 Adjusting Off Center Load.................................................................................4-6