OHAUS Valor 3000 User manual

SERVICE MANUAL
Valor
ValorValor
Valor
™ 3000 SCALES
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 [phone]

SERVICE MANUAL
Valor
Valor Valor
Valor ™ 3000 SCALES
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 2009 Ohaus Corporation, all rights reserved.
TM Registered trademark of Ohaus Corporation.

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com i Valor™ 3000 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.......................................................................................................... 1-2
1.5 Scale Operation ...................................................................................................... 1-4
1.5.1 Overview of the Controls.................................................................................. 1-4
1.5.2 Overview of the Display Indicators................................................................... 1-5
1.5.3 Power On......................................................................................................... 1-5
1.5.4 Power Off......................................................................................................... 1-5
1.5.5 Menu Setup ..................................................................................................... 1-5
1.6 Legal For Trade (LFT)............................................................................................. 1-6
1.6.1 LFT Setup Procedure....................................................................................... 1-6
1.7 Menu Structure ....................................................................................................... 1-7
CHAPTER 2 TROUBLESHOOTING
2.1 Troubleshooting ...................................................................................................... 2-1
2.2 Diagnostic Guide..................................................................................................... 2-1
2.2.1 Diagnosis......................................................................................................... 2-1
CHAPTER 3 MAINTENANCE PROCEDURES
3.1 Preventive Maintenance.......................................................................................... 3-1
3.1.1 Preventive Maintenance Checklist ................................................................... 3-1
3.2 Opening the Scale................................................................................................... 3-1
3.2.1 Opening Valor 3000 Standard and Washable Models...................................... 3-2
3.3 Replacing the Load Cell .......................................................................................... 3-3
3.4 Replacing the Printed Circuit Board and Display ..................................................... 3-4
3.5 Replacing the Housing Seals .................................................................................. 3-5
3.6 Replacing the Function Label.................................................................................. 3-6
3.7 Replacing the Plastic Insert..................................................................................... 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. Load Cell Test Using RAMP.................................................................................... 4-1
4.5 Performance Tests.................................................................................................. 4-2
4.5.1 Precision Test .................................................................................................. 4-2
4.5.2 Repeatability Test ............................................................................................ 4-3
4.5.3 Linearity Test ................................................................................................... 4-5
4.5.4 Off-Center Load Test ....................................................................................... 4-5
4.5.5 Adjusting Off Center Load................................................................................ 4-6
CHAPTER 5 DRAWINGS AND PARTS LISTS
5-1 Valor 3000 Xtreme Scales: Housing & Internal Parts .............................................. 5-2
5-2 Valor 3000 Xtreme W Scales: Housing & Internal Parts .......................................... 5-4

TABLE OF CONTENTS
Valor™ 3000 Series Service Manual ii Ohaus Corporation www.ohaus.com
Appendix A STANDARD CALIBRATION Page No.
A.1 Calibration............................................................................................................... A-1
Appendix B THE SERVICE MENU
B.1 Entering the Service Menu...................................................................................... B-1
B.2 Ramp ...................................................................................................................... B-1
B.3 Linear Calibration.................................................................................................... B-2
B.4 Span Calibration ..................................................................................................... B-3
B.5 Geographical Adjustment Factor (GEO).................................................................. B-4
B.6 Expanded Readability (E.PAnd).............................................................................. B-5
APPENDIX C SOFTWARE SERVICE TOOL INSTRUCTIONS
C.1 Hardware and Software Setup ................................................................................C-1
C.2 Configuring the Scale (after replacing the PCB or Load Cell) ..................................C-4
APPENDIX D GEOGRAPHICAL ADJUSTMENT VALUES
TABLE D-1. Geographical Adjustment Values..................................................................D-1
LIST OF TABLES
TABLE NO. TITLE Page No.
1-1 Specifications ..................................................................................................... 1-2
1-2 Capacity and Readability .................................................................................... 1-3
1-3 Functions of Display Controls ............................................................................. 1-4
1-4 Display Indicators ............................................................................................... 1-5
1-5 Valor 3000 Menu Structure................................................................................. 1-7
2-1 Diagnostic Guide ................................................................................................ 2-2
4-1 Calibration Mass Values ..................................................................................... 1-2
4-2 Tolerances.......................................................................................................... 4-2
4-3 Repeatability Worksheet..................................................................................... 4-4
4-4 Linearity Test Masses......................................................................................... 4-5
5-1 Valor 3000 Xtreme Scales: Housing & Internal Parts .......................................... 5-3
5-2 Valor 3000 Xtreme W Scales: Housing & Internal Parts...................................... 5-5
D-1. Geographical Adjustment Values........................................................................D-1
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE
1-1 Power Connection and Seal ............................................................................... 1-4
1-2 Valor 3000 Xtreme & Xtreme W Displays ........................................................... 1-4
1-3 Valor 3000 Display Indicators ............................................................................. 1-5
1-4 LFT/Cal Lock Switch........................................................................................... 1-6
3-1 Scale Bottom ...................................................................................................... 3-2
3-2 Technique for separating Top and Bottom Housing on Valor 3000 ..................... 3-2
3-3 Red lock between battery compartments ............................................................ 3-3
3-4 Printed Circuit Board and Display ....................................................................... 3-4
3-5 Bottom of Valor 3000 Xtreme W, with Battery Cover on...................................... 3-5
3-6 Seal washer for Weighing Plate.......................................................................... 3-5
3-7 Seal washer on left-rear of PCB.......................................................................... 3-5
3-8 Plastic Insert and Function Label ........................................................................ 3-6
3-9 Plastic Insert, viewed from inside Top Housing................................................... 3-6
4-1 Segment Display ................................................................................................ 4-1
4-2 Scale drawing of Valor 3000 Load Cell and Weighing Pan ................................. 4-6

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com iii Valor™ 3000 Series Service Manual
TABLE NO. TITLE Page No.
5-1 Valor 3000 Xtreme Scales: Housing & Internal Parts .......................................... 5-2
5-2 Valor 3000 Xtreme W Scales: Housing & Internal Parts...................................... 5-4
C-1 RS232 Interface connected to Service Interface, connected to the PCB............. C-1
C-2 Service Interface fits into the RS232 Interface .................................................... C-1
C-3 Com Port Configuration screen with correct settings........................................... C-2
C-4 Config Tool’s Test Command screen..................................................................C-2
C-5 The Config Tool’s Configuration Screen ............................................................. C-3

TABLE OF CONTENTS
Valor™ 3000 Series Service Manual iv Ohaus Corporation www.ohaus.com

CHAPTER 1 GETTING STARTED
1.1 INTRODUCTION
This service manual contains the information needed to perform routine maintenance and
service on the Ohaus Valor 3000 Series scales. Familiarity with the scale’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 scale.
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 Valor 3000 scales
identifying all serviceable components.
Appendix A Standard Calibration – Explains procedures for Standard Calibration, performed
prior to using a scale, and after service.
Appendix B Service Calibration – Describes the Service Menu and sub-menus, which allow
authorized service personnel to perform factory Linearity and Span calibrations (no pre-set
limits), take Ramp readings, adjust the GEO Factor, and use E.PAnd to set the readability to
1/10th of the standard readability.
Appendix C Software Service Tool Instructions –Used to re-configure the scale after
replacing a Printed Circuit Board or Load Cell.
Appendix D Geographical Adjustment Values –The chart of scale settings for every
geographical latitude away from the equator (in degrees and minutes) and every elevation
above sea level (in meters or feet).
1.2 SERVICE FACILITIES
To service a scale, the service area should meet the following requirements:
•Should be temperature controlled and meet scale 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.
•Scale must not be exposed to direct sunlight or radiating heat sources.
•Use an approved Electro-Static Device.
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CHAPTER 1 GETTING STARTED
1.3 TOOLS AND TEST EQUIPMENT REQUIRED
1. Common hand tools are sufficient to disassemble the Valor 3000 scales.
2. RS2323 Interface Connector – PN 71147376 or 72206287
3. Communications Service Interface – PN 72203450
1.4 SPECIFICATIONS
Complete specifications for the Ohaus Valor 3000 Scales are listed in Table 1-1. When a scale
has been serviced, it must meet the specifications listed in the table. Before servicing the scale,
determine what specifications are not met.
TABLE 1-1. SPECIFICATIONS
Model V31XH202 V31XH2 V31X3 V31X6 V31XW301 V31XW3/
V31X3N V31XW6/
V31X3N
Capacity 200 2000 3000 6000 300 3000 6000
Repeatability (g) 0.01 0.1 1 0.2 1 2
Linearity (g) (+/-) 0.01 0.1 1 0.2 1 2
Weighing Units g, kg, lb, oz, lb:oz
Application Modes Weigh, Percent weighing, Specific Gravity, Fluid Ounces
Tare range To capacity by subtraction
Stabilization Time ≤3 seconds
Power Requirements 9 VDC 500 mA AC adaptor (supplied) or
4 C (LR14) batteries (not supplied)
Calibration Digital with external weight
Display Type 6-digit 7-segment LCD with white LED backlight
Display Size 15 mm / 0.6” digits
Keypad 3-button overlay
OIML Class - - - - III III III
Ingress Protection - - - - IP65 IP65*IP65*
Pan Size (mm / in) 120/4.7 146 x 158 / 5.7 x 6.2
Net Weight (kg / lb) 1.2/2.6 1.3/2.9 1.4/3.1
Shipping Weight
(kg/lb) 2.6/5.7 2.7/6 2.8/6.2
* Models V31X3N and V31X6N are not rated IP65.
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CHAPTER 1 GETTING STARTED
1.4 SPECIFICATIONS
TABLE 1-2. CAPACITY AND READABILITY
Non-Washable Models Washable Models
Units V31XH202 V31XH2 V31X3 V31X6 LFT
SWITCH V31XW301 V31XW3/
V31X3N V31XW6/ V31X6N
NA NA NA NA ON 300.0 x
0.2 3000 x 1 6000 x 2
g 200.00 x
0.01 2000.0 x 0.1 3000 x 1 6000 x 1 OFF 300.0 x
0.1 3000.0 x 0.5 6000 x 1
NA NA NA NA ON 0.3000 x
0.0002 3.000 x 0.001 6.000 x 0.002
kg 0.20000 x
0.00001 2.0000 x 0.0001 3.000 x 0.001 6.000 x 0.001 OFF 0.3000 x 0.0001 3.0000 x 0.0005 6.000 x 0.001
NA NA NA NA ON 10.58 x
0.01 105.80 x 0.05 211.6 x 0.1
oz 7.0550 x
0.0005 70.550 x 0.005 105.80 x 0.05 211.65 x 0.05 OFF 10.585 x
0.005 105.80 x 0.02 211.60 x 0.05
NA NA NA NA ON 0.6615 x
0.0005 6.615 x
0.005 13.225 x 0.005
lb 0.44090 x
0.00005 4.4090 x 0.0005 6.615 x 0.005 13.230 x 0.005 OFF 0.6615 x
0.0005 6.615 x
0.002 13.225 x 0.005
NA NA NA NA ON NA 6 lb : 9.80
oz x 0.05
oz
13 lb: 3.6
oz x 0.1
oz
Lb:oz
NA 4lb:
6.55oz x
0.01oz
6 lb :
9.80 oz x
0.05oz
13lb:
3.65oz x
0.05oz OFF NA
6 lb : 9.80
oz x 0.02
oz
13 lb:
3.60 oz x
0.05 oz
NA NA NA NA ON 10 ½ oz x
1 / 8
105 ½ oz
x
1 / 8
211 ½ oz
x
1 / 8
oz
(fra) 7 x 1/8 70½ oz x
1/8 105½ oz x 1/8 211½ oz x 1/8 OFF 10½ oz x
1/8 105½ oz
x 1/8 211½ oz x 1/8
NA NA NA NA ON N A 6lb : 9½
oz x
1/8oz
13 lb :
3½ oz x
1/8oz
lb:oz
(fra) N A 4lb : 6 ½
oz x 1/8
oz
6lb : 9 ½
oz x
1/8oz
13 lb : 3
½oz x
1/8oz OFF N A 6lb : 9 ½
oz x
1/8oz
13 lb : 3½
oz x 1/8oz
NA NA NA NA ON 10.14 x
0.01 101.45 x 0.05 202.9 x 0.1
fl 6.7630 x
0.0005 67.630 x 0.005 101.45 x 0.05 202.90 x 0.05 OFF 10.140 x 0.005 101.44 x 0.02 202.90 x 0.05
Valor™ 3000 Series Service Manual 1-3 Ohaus Corporation www.ohaus.com

CHAPTER 1 GETTING STARTED
1.5 SCALE OPERATION
This section contains information on the basic operation of the scale.
The included AC adapter may be used to
power the scale when battery power is not
available. Remove the rubber seal in the
bottom. Store it in the location provided.
(See Figure 1-1. Connect the AC adaptor
plug to the input jack.
Input
Jack
Seal
Seal Storage
Receptacle
Figure 1-1. Power Connection and Seal.
1.5.1 OVERVIEW OF THE CONTROLS
Figure 1-2. Valor 3000 Xtreme & Xtreme W Displays.
TABLE 1-3. FUNCTIONS OF DISPLAY CONTROLS
Button Action Functions
Turns scale on
Sets display to zero
Tares weight of item on pan
Turns scale off
O/T On/Off Short Press (when off)
Short Press (when on)
Long Press
MODE/UNIT
Menu Short Press
Long Press
Short Press (Menu mode):
Steps through active units and modes
Enters Menu
“No” (toggles through available settings)
Stores 100% reference in % mode
Stores reference sample in SG mode
Initiates span calibration process
“Yes” (selects/accepts displayed setting)
ENTER Cal Short Press
Long Press
Short Press (Menu)
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CHAPTER 1 GETTING STARTED
1.5.2 OVERVIEW OF THE DISPLAY INDICATORS
3
1 2
Figure 1-3. Valor 3000 Display Indicators.
TABLE 1-4. DISPLAY INDICATORS
No. Function
1Indicates that the measured value has become stable.
2 Standard 7-segment numeric characters, used for displaying weight values.
Symbols for weighing modes, include: FL – Fluid Ounces % - Percent (of referenced
weight), S – Specific Gravity kg – Kilograms, lb:oz – Pounds & Ounces
3
1.5.3 Power ON
With power applied, press O/T On/Off. After segment display and software revision number,
there is a countdown (-4-,-3-,-2-,-1-), and then * 0.00 oz (standard weighing mode).
If the scale is set for LFT (Legal For Trade – available on XW and NTEP “N” models), LFT
flashes briefly after the software revision number and before the countdown.
(To reverse the LFT setting, see Section 1.7.)
Allow time for the scale 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 (2.7°C)
temperature change before using the scale. After temperature stabilization, allow an additional
20 minutes after turning the scale on, for the scale electronics to stabilize.
When the scale is first turned on, the factory default is to weigh in grams and tare items without
setting the menus.
1.5.4 Power OFF
To turn the scale OFF, press and hold >O/T< until the display indicates OFF,then release.
1.5.5 Menu Setup
Programmable features of the Valor 3000 scales are contained in menus which are accessed
through the Display Panel’s control switches. The Menu Structure is described in Section 1.8.
(For more detail on using the menus, see the Instruction Manual.)
Note: If the scale is set for LFT (on XW and NTEP models), the Unit and Calibration menus are
not accessible, and the following Setup submenus are not accessible: Stability, AST, Filter,
Power On Unit, and Global Reset. To gain access to these submenus, see the next section.
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CHAPTER 1 GETTING STARTED
1.6 LEGAL FOR TRADE (LFT)
When the scale is set for LFT (on XW and NTEP models), the following menu settings cannot
be accessed/changed: Calibration, Unit, Stability, AST, Filter, Power On Unit, and Global Reset.
To regain access to the locked menu settings, remove the small rectangular LFT/Calibration
Lock Switch cover on the bottom of the scale. (See Figure 1-4.) Use a small flathead screw
driver to move the CAL switch to the left (closer to the “L” in “CAL”), which turns LFT off.
After the LFT/CAL Lock setting has been
turned off, the scale must be inspected in
accordance with local weights and measures
regulations before it can be used in LFT mode
again. Local authorities may apply seals on
the three screws indicated in Figure 1-4.
Figure 1-4. LFT/Cal Lock Switch.
Screws to
which LFT
seals may
be applied
1.6.1 LFT SETUP PROCEDURE
4. Set the Geographical Adjustment Factor (GEO) according to the location where the
scale is to be used. (See Appendix D. Possible values are from 1 to 31.) The
setting is in the Service Menu: press O/T/Off and MODE/UNITMenu simultaneously
during power on. Press No three times until GEO appears, then press Yes. Then
continuously press No until the desired number appears. Press Yes, then No until
END appears. Press Yes to return to weighing mode.
5. Access the Setup menu (Press and hold MODE/UNIT/Menu until SEtUP appears.
Press Yes to enter the displayed menu, or No to advance to the next menu, etc.)
Set the following:
Auto Zero Tracking (AZT) = 0.5d
Stability (Stab) =1d
Units as per local LFT requirements
6. Perform an accurate calibration. (See Appendix A.)
7. Turn the Scale off and disconnect the AC power connection.
8. Open the rectangular LFT/Calibration Lock Switch Cover on the bottom of the scale.
9. Move the switch to the right (closer to the “C” in “CAL”), which turns LFT on.
10. Reinstall the LFT/Calibration Lock Switch Cover.
11. Reconnect the AC power, press O/T/On/Off to turn on the scale. During power on,
the display sequence will now include: “LFT.” This message confirms the proper
setting of the LFT mode and the hardware lock switch.
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CHAPTER 1 GETTING STARTED
Valor™ 3000 Series Service Manual 1-7 Ohaus Corporation www.ohaus.com
1.7 Menu Structure
Programmable features of the Valor 3000 are contained in menus which are accessed through
the Display Panel’s control switches. The menu structure is illustrated below. (For more detail
on using the menus, see the Instruction Manual.)
TABLE 1-5. VALOR 3000 MENU STRUCTURE
SETUP (Press and hold
MODE/UNIT/Menu until SETUP
appears. Press Yes.)
UNIT (appears after pressing
Yes to end SETUP menu.
Press Yes.)
Sta ility
Automatic Zero Tracking (AZT)
Filter
Backlight
Auto Off
Power On Unit
Glo al Reset
Legal For Trade*
End Setup

g
Kg
Oz
Lb
Lb:Oz
FL
%
S (Specific Gravity)
End Units
CALIBRATION (Press and
hold ENTER/Cal until CAL
appears and cali ration egins.)
See Appendixes A & B for more
details.
*Legal For Trade is included only in models V31XW301, V31XW3, V31XW6, V31XW3N, and V31XW6N.

CHAPTER 1 GETTING STARTED
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CHAPTER 2 DIAGNOSTIC GUIDE
2.1 TROUBLESHOOTING
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 scale components with care. Use appropriate
Electro-Static Device.
2.2 DIAGNOSTIC GUIDE
Table 2-1 is a 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 scale, read all
chapters of this manual to be familiar with the scale components and operation.
2.2.1 Diagnosis
1. Isolate and identify the symptom
2. Refer to Table 2-1, Diagnostic Guide and locate the symptom.
3. Follow the suggested remedies in the order they appear.
4. Perform the indicated checks, or see the appropriate section of the manual.
5. Repair or replace the defective section of the scale.
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.
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CHAPTER 2 DIAGNOSTIC GUIDE
2.2.1 Diagnosis
TABLE 2-1. DIAGNOSTIC GUIDE
Symptom Possible Cause Remedy
Cannot turn on No power to scale Verify connections and voltage.
Poor accuracy Improper calibration
Unstable environment Perform calibration • Move scale to suitable location
Cannot calibrate Unstable environment
Incorrect calibration weight Move the scale to suitable location Use correct calibration weight
Cannot access mode Mode not enabled Enter menu and enable mode
Cannot access unit Unit not enabled Enter menu and enable unit
Err 8.1 Pan has load during power on
Zero has drifted
Load Cell is damaged
Remove weight from pan and
re-zero.
In Service Menu, run RAMP to check
Load Cell. Then calibrate.
Replace Load Cell.
Err 8.2 Pan was removed prior to power
on
Zero has shifted
Load Cell is damaged
Install pan and re-zero.
In Service Menu, run RAMP to check
Load Cell. Then calibrate.
Replace Load Cell.
OVER Weight on pan exceeds capacity Remove weight from the pan
UNDER Pan was removed during
weighing Re-install pan
Err 9 New PCB installed.
Factory calibration data
corrupted
Configure scale – see Appendix C.
Perform service calibration
REF Err Reference Weight is too small Use larger sample
LOWrEF Reference Weight is too low for
accurate percent weighing. Continue to weigh with less accurate results
Menus are locked
out: Cal, Stab, AZT,
Filter, Power On Unit
or Global Reset
Scale is set for LFT. Turn LFT off. (See Section 1.7.)
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CHAPTER 3 MAINTENANCE PROCEDURES
3.1 PREVENTIVE MAINTENANCE
Ohaus scales 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 scale 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 scale when the scale is not in use.
– Allow time for the scale 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
(2.7°C) temperature change before using the scale. After temperature stabilization,
allow an additional 20 minutes after turning the scale on, for the scale electronics to
stabilize.
3.1.1 Preventive Maintenance Checklist
The scale 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 scale using a damp cloth with warm water.
CAUTION
DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE.
SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE’S FINISH.
3. Check the Power Cord for broken or damaged insulation.
4. If using batteries and the scale malfunctions, first replace the batteries to see if this
resolves the problem. The Valor 3000 takes four “C” (LR 14) batteries.
5. Make a visual inspection for faulty connectors, wiring, and loose hardware.
3.2 OPENING THE SCALE
Opening the Valor 3000 scale varies slightly according to the specific model, as detailed below.
Use these procedures in order to replace the Load Cell, the Printed Circuit Board and/or LCD
Display.
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CHAPTER 3 MAINTENANCE PROCEDURES
3.2.1 Opening Valor 3000 Standard and Washable Models
Common hand tools are sufficient to disassemble the Valor 3000 scales. Turn the scale off and
unplug the power cord before you begin.
1. Remove the Weighing Pan: pry off the
seal tab, remove the screw and washer
securing the Pan Support, and lift off
the Pan Support.
2. Remove the Load Cell Seal and Ring.
(XW models only.)
(See Figure 3-1.) Start by lifting the
outer edge, then gently lift to pull the
O-ring and seal from the center.
3. Remove the screws holding the
Housing in place. (See Figure 3-2.)
The screw on the left side may have a
tamper-evident seal, used in Legal For
Trade application.
(See Section 1.8 for more details.)
Figure 3-1. Proper way to lift off Seal.
Figure 3-2. Scale Bottom, Valor 3000XW.
4. Replace a screw (without tightening it)
in the hole closest to the back end of
the scale. Use a thumb-sized coin to
press the screw while holding the
leveling feet on either side. The Top
Housing should come off. (See Figure
3-3.)
Note: If separating the Top and
Bottom Housing is difficult, because of
the seal gasket between them, do not
apply pressure to the top of the Load
Cell while holding the Housing, to
release it from the Bottom Plate.
Figure 3-3. Technique for separating Top and
Bottom Housing on Valor 3000.
Screws that secure the Housing
(each with a seal washer inside)
Ohaus Corporation www.ohaus.com 3-2 Valor™ 3000 Series Service Manual