OHAUS Valor 1000W User manual

SERVICE MANUAL
Valor
™1000WScales
Ohaus Corporation, 7 Campus Drive, Suite 310, Parsippany, NJ 07054 [phone]

SERVICE MANUAL
Valor™1000WScales
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 2011 Ohaus Corporation, all rights reserved.
TM Registered trademark of Ohaus Corporation.

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com i Valor™ 1000W 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........................................................................1-2
1.4 Model Numbers –Valor 1000W ...............................................................................1-2
1.5 Specifications...........................................................................................................1-2
1.6 Scale Operation.......................................................................................................1-3
1.6.1 Overview of the Controls...................................................................................1-3
1.6.2 Power On..........................................................................................................1-4
1.6.4 Power Off..........................................................................................................1-4
1.7 How Load Cells Operate..........................................................................................1-5
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.......................................................................2-1
2.2.3 Diagnostic Guide...............................................................................................2-4
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
3.4 Removing/Replacing the Main PCB .........................................................................3-3
3.5 Removing/Replacing the Rear Display PCB.............................................................3-3
3.6 Removing/Replacing the Load Cell..........................................................................3-4
3.7 Removing/Replacing the Battery..............................................................................3-5
3.8 Replacing the Function Label...................................................................................3-5
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
CHAPTER 5 PARTS LISTS & DRAWINGS
5-1 Parts lists & Drawings..............................................................................................5-1
5-2 Valor 1000W (V11PW3) Scales: Parts.....................................................................5-2
5-3 Valor 1000W (V11PW6) Scales: Parts.....................................................................5-4
5-4 Valor 1000W (V11PW15) Scales: Parts...................................................................5-6
5-5 Valor 1000W (V11PW30) Scales: Parts...................................................................5-8

TABLE OF CONTENTS
Valor™ 1000W Series Service Manual ii Ohaus Corporation www.ohaus.com
Appendix A STANDARD CALIBRATION
A.1 Setup and Calibration..............................................................................................A-1
LIST OF TABLES
TABLE NO. TITLE Page No.
1-1 Specifications (G Models)....................................................................................1-2
1-2 Specifications (Non-G Models) ............................................................................1-3
1-3 Functions of Display Controls ..............................................................................1-4
2-1 Load Cell Resistance Readings (in Ohms) ..........................................................2-2
2-2 Color Code for Load Cell Wiring ..........................................................................2-2
2-3 Load Cell Output Readings (in mV with 5V Excitation).........................................2-3
2-4 Diagnostic Guide.................................................................................................2-2
3-1 Mounting Bolt Torque Settings.............................................................................3-5
4-1 Calibration Mass Values......................................................................................4-1
4-2 Repeatability Worksheet......................................................................................4-4
4-3 Linearity Test Masses..........................................................................................4-5
5-1 Valor 1000W (V11PW3) Scales: Parts.................................................................5-3
5-2 Valor 1000W (V11PW6) Scales: Parts.................................................................5-5
5-2 Valor 1000W (V11PW15) Scales: Parts...............................................................5-7
5-2 Valor 1000W (V11PW30) Scales: Parts...............................................................5-9
LIST OF ILLUSTRATIONS
FIGURE NO. TITLE
1-1. Valor 1000W Control Panel .................................................................................1-4
1-2 Strain Gauge Load Cell .......................................................................................1-5
1-3 Downward force on the Platform bends the beam................................................1-5
1-4 Route of electrical Load Cell input and output through Wheatstone Bridge..........1-6
2-1 Load Cell wire connections to Main PCB.............................................................2-3
3-1 Valor 1000W Bottom............................................................................................3-2
3-2 PCP Housing.......................................................................................................3-2
3-3 Main Printed Circuit Board...................................................................................3-3
3-4 Rear Display PCB (installed) ...............................................................................3-3
3-5 Removing bolts holding bottom housing to the Load Cell.....................................3-4
3-6 Removing screws holding top housing to the Load Cell.......................................3-4
3-7 Rechargeable battery ..........................................................................................3-5
4-1 Segment Display .................................................................................................4-1
4-2 Scale drawing of Valor 1000W Load Cell and Weighing Pan...............................4-6
5-1 Valor 1000W (V11PW3) Scales: Parts.................................................................5-2
5-2 Valor 1000W (V11PW6) Scales: Parts.................................................................5-4
5-3 Valor 1000W (V11PW15) Scales: Parts...............................................................5-6
5-4 Valor 1000W (V11PW30) Scales: Parts...............................................................5-8

CHAPTER 1 GETTING STARTED
Valor™1000W Series Service Manual 1-1 Ohaus Corporation www.ohaus.com
1.1 INTRODUCTION
This service manual contains the information needed to perform routine maintenance and
service on the Ohaus Valor 1000W 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 and test
equipment, 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 1000W scales
identifying all serviceable components.
Appendix A Standard Calibration –Explains procedures for Standard Calibration, performed
prior to using a scale, and after service.
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

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-2 Valor™1000W Series Service Manual
1.3 TOOLS AND TEST EQUIPMENT REQUIRED
1. Common hand tools
2. Standard electronics tool kit
3. Digital Voltmeter (DVM) capable of reading from 1 mv to 50 V dc.)
1.4 MODEL NUMBERS –VALOR 1000W
V11PWXX
XX Capacity in kilo:
3= 3kg
6= 6kg
15 = 15kg
30 = 30kg
V11PW: Model Name
1.5 SPECIFICATIONS
TABLE 1-1. SPECIFICATIONS
Model
V11PW3
V11PW6
V11PW15
V11PW30
Capacity x Readability
Max x d (non-approved)
3 x 0.0005 kg
6.6 x 0.001 lb
6 x 0.001 kg
13 x 0.002 lb
15 kg x 0.002 kg
33 x 0.005 lb
30 kg x 0.005 kg
66 x 0.1 lb
Max displayed
resolution
1:7500d
Weighing Units
kg or lb
Linearity
±2d
Off Center Load error
±2d
Repeatability
±2d
Hysteresis
±2d
Zero drift vs. temp.
±2 d / oC
Span drift vs. temp.
±2d / C
Tare Range
2/3 or full scale
Stabilization Time
≤2 seconds
Auto Zero Tracking
User selectable from 0.1d to 2d
Operating Temp. range
-10°to 40°C / 14°to 104°F
Storage Temp. range
-10°to 60°C / 14°to 140°F
Humidity Range
≤90% relative humidity, non-condensing

CHAPTER 1 GETTING STARTED
Valor™1000W Series Service Manual 1-3 Ohaus Corporation www.ohaus.com
Power
9VDC 700mA AC adapter / Internal rechargeable sealed lead acid battery
Battery Life
30-hour typical operation with 12-hour full charge
Pan Size (mm/in)
250 x 180 / 9.9 x 7.1
Complete specifications for the Ohaus Valor 1000W Scales are listed in the tables.
When a scale has been serviced, it must meet the specifications listed in the tables.
Before servicing the scale, determine what specifications are not met.
1.6 SCALE OPERATION
This section contains information on the basic operation of the scale.
1.6.1 OVERVIEW OF THE CONTROLS
Figure 1-1. Valor 1000W Control Panel and Bottom.
TABLE 1-2. CONTROLS
Item
Description
1
Battery charge indicator
2
Low battery indicator
3
Level Bubble
1
2
3
4
5
6
7
Front display
Rear display
8
9

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-4 Valor™1000W Series Service Manual
4
7-segment, 6-digit LED display
5
Center of Zero, Net, Stable, Sum, lb, kg indicators
6
Over, Accept, Under Checkweigh indicators
7
Control Buttons
8
Adjustable feet
9
Power input jack
TABLE 1-3. FUNCTIONS OF DISPLAY CONTROLS
1.6.2 Power ON/OFF
To turn the scale on, press the button On/Off on the control panel. The scale performs a display
test, momentarily displays software version, and then enters the active weighing mode. To turn
the scale off, long press the button On/Off.
The Valor 1000W can operate on either AC Power, with the included AC adapter, or on the
internal rechargeable battery. The scale automatically switches to battery operation if power
fails while the scale is on.
Before using the scale for the first time, the battery should be fully charged for up to 12 hours.
During charging, the battery Charge indicator remains lit. The scale can be operated during
charging. The battery is protected against over-charging and the scale can remain connected to
the AC power line.
1.7 HOW LOAD CELLS OPERATE
Load Cells are devices that convert force into a signal. The Valor 1000W has a Strain Gauge
Load Cell, which is made from a metal beam with holes drilled in it. Strain gauges are affixed to
the beam at the top and bottom to measure changes in the beam due to deflection. The gauges
are bonded very securely to the metal, where they sense very small deflections in the metal
caused by the load being applied to the cell. Because the signal levels are very small, the
Button
Action
Function
Short Press
Turns scale on
Long Press
Turns scale off
Menu function
Shift to next digit when setting parameters, or step through menu settings
Primary function
Sets display to zero
Menu function
Confirm settings
Long Press
Enters menu mode
Menu function
Save settings and exit the menu
Primary function
Stores displayed weight in accumulation memory
Display accumulation data when display is at zero
Menu function
Increment displayed value, or toggle through menu settings
Primary function
Tares weight of item on pan
Menu function
Decrement displayed value, or toggle through menu settings

CHAPTER 1 GETTING STARTED
Valor™1000W Series Service Manual 1-5 Ohaus Corporation www.ohaus.com
circuit is protected from all outside influences such as moisture, physical damage, or electrical
interference.
Figure 1-2. Strain Gauge Load Cell.
The strain gauges are wired into a Wheatstone Bridge Circuit. (See Figure 1-3.)
Figure 1-3. Downward force on the Platform bends the beam, causing two gauges to stretch
and two to compress in opposition, changing the electrical resistance of the circuit.
At zero load, all strain gauges are unstressed. Weight placed on the Platform bends the
beam, causing two gauges to stretch and two to compress in opposition, changing the
electrical resistance of the circuit.
1.7 HOW LOAD CELLS OPERATE continued
The difference in the output signal before and after the mass was placed on the platform is
taken, interpreted and displayed.
Force
Strain Gauges
Holes drilled in Strain
Gauge Load Cell
Printed Circuit Board
completing Wheatstone
Bridge circuit
Beam
Attachment points to
Platform
Wheatstone Bridge Circuit
Strain Gauge
+
+
Strain Gauge
–
Strain Gauge
Strain Gauge
–

CHAPTER 1 GETTING STARTED
Ohaus Corporation www.ohaus.com 1-6 Valor™1000W Series Service Manual
Figure 1-4. Route of electrical Load Cell input and output through Wheatstone Bridge circuit.
A Load Cell is a force sensor, which receives a voltage (excitation) from a regulated power
source in the Indicator, and sends back a low-voltage milli-volt (mV) relative to the force applied.
The Load Cell signal is read by the Indicator, which converts it to a numeric value and shows it
visually. This output value increases as weight is loaded to the Load Cell.
For example, a 500kg Load Cell with 2mV/V output and 5V excitation would have a change of
0.02mV per kg change in the load, that is, 10mV/500=0.02mV per kg. At a load of 250kg the
signal voltage would thus increase by 5mV from the value measured at no load.
Tension
Tension
Compression
Compression
+Excitation
(Supply)
–Excitation
(Supply)
INPUT(volts)
LOADCELL
2 mV/V
Strain
Gauges
4 strain gauges
connected as a
Wheatstone
Bridge
OUTPUT (milli volts)
+Sig
–Sig

CHAPTER 2 DIAGNOSTIC GUIDE
Valor™1000W Series Service Manual 2-1 Ohaus Corporation www.ohaus.com
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 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.
2.2.2 Checking Load Cells for Trouble
1. Visual Check:
–Clean the unit before evaluating any mechanical problems. In some cases,
debris may have accumulated inside the Housing. Make sure there is no buildup
of any foreign material.
–Examine the unit for bent Frame or signs of physical abuse that could cause it to
malfunction. Replace all damaged parts. See Chapter 5 for parts identification.
–Check that the Down Stops are not touching the Frame. This would restrict
movement, causing improper operation. If the Down Stops are improperly set,
adjust them. (See Section 3.6.)
–Check the cables leading to the Load Cell for cuts, abrasions or other signs of
excessive wear and tear.
–Check for a bent or twisted Load Cell: Place the top surface and then each of
the sides of the Load Cell on a flat surface, to see if it rests flat and even.
A gap indicates a bent or twisted Load Cell. A Load Cell that is even slightly bent
or corroded should be replaced.
–Examine the Load Cell for corrosion due to high humidity or exposure to
chemicals.

CHAPTER 2 DIAGNOSTIC GUIDE
Ohaus Corporation www.ohaus.com 2-2 Valor™1000W Series Service Manual
2.2.2 Checking Load Cells for Trouble
2. Perform a Resistance Test, to determine if the Load Cell is severely damaged or a
short circuit to the frame has occurred. (See Chapter 4 for details.)
Note: The Load Cell must be completely disconnected from the Printed Circuit
Board and at no load when the resistance readings are taken.
Using an ohm meter, measure and record resistance between each pair of wires
from the Load Cell, as specified in Table 2-1. Compare the measured readings with
the specified values in Table 2-1.
If the resistance readings are in the range specified, skip to the next section. If they
are outside the expected range, open circuit or short-circuit across any two wires, the
Load Cell is defective: replace it. (See Chapter 3.)
TABLE 2-1. LOAD CELL RESISTANCE READINGS (in Ohms)
Models
Ex+ to Ex–
S+ to S–
Ex+ to S–
Ex+ to S+
Ex–to S+
Ex–to S–
V11PW3
404 ±10
350 ±4
289 ±10
289 ±10
289 ±10
289 ±10
V11PW6
404 ±10
350 ±4
289 ±10
289 ±10
289 ±10
289 ±10
V11PW15
404 ±10
350 ±4
289 ±10
289 ±10
289 ±10
289 ±10
V11PW30
404 ±10
350 ±4
289 ±10
289 ±10
289 ±10
289 ±10
3. Perform an Output Voltage Test:Measure the no load, 50% load and full load
output. The reading should meet the Load Cell specifications. The Load Cell output
should be very close to linear over its capacity range.
NOTE: The following steps involve power applied to the scale. Load Cell contacts
can be used as measuring points. See Figure 2-1.
The EXE+ and EXE–wires should be connected to the PCB, and the IN+ and IN–
wires should be disconnected. Record the colors for each wire connection before
disconnecting. (See Table 2-2 for typical color code for Valor 1000.)
TABLE 2-2. COLOR CODE FOR LOAD CELL WIRING*
GREEN
WHITE
RED
BLACK
EXE–
EXE+
IN+
IN–
*Color codes may vary.
–Insert the Platform Support into the Load Cell Frame, place the Platform on top,
and turn on power to the scale.
–Using a voltmeter, measure and record the excitation voltage supplied to the
PCB: with no load on the Platform, measure the voltage across points 3 and 4 of
Load Cell connection on the PCB (+EXE and –EXE). This voltage must be
approximately 5.0 Volts dc with the Load cell connected. If the voltage is lower,
disconnect the Load Cell cable from the PCB and measure again. If the voltage
is 5 Volts dc, the Load Cell is defective and must be replaced. If the voltage
remains low, the PCB is defective and must be replaced.

CHAPTER 2 DIAGNOSTIC GUIDE
Valor™1000W Series Service Manual 2-3 Ohaus Corporation www.ohaus.com
2.2.2 Checking Load Cells for Trouble
Figure 2-1. Load Cell wire connections to Main PCB.
CAUTION:
IN THE NEXT STEP, DO NOT OVERLOAD THE SCALE BEYOND FULL
CAPACITY RATING.
–Measure the voltages on IN- and IN+ wires, disconnected from PCB
(points 1 and 2 in Figure 2-1). Note: Measurements must be made with these
wires disconnected from the PCB. These measurements represent the output of
the Load Cell. Record measurements at Zero Load, 50% and full scale
capacities. See Table 2-3 for typical readings.
NOTE: Table 2-3 indicates typical readings. Actual values can vary, but should
remain linear throughout the range. If readings are out of tolerance, replace the
Load cell. (See Section 3.6.)
TABLE 2-3. LOAD CELL OUTPUT READINGS (in mV with 5V Excitation)
Model/Capacity
Zero Load
50% Load
100% Load
V11PW3 / 3kg
1.5 ± 2.0
Zero + 4.1
Zero + 6.7
V11PW6 / 6kg
0.9 ± 2.0
Zero + 3.4
Zero + 5.9
V11PW15 / 15kg
0.6 ±2.0
Zero ±3.2
Zero ±5.9
V11PW30 / 30kg
0.3 ± 2.0
Zero + 2.8
Zero + 5.4

CHAPTER 2 DIAGNOSTIC GUIDE
Ohaus Corporation www.ohaus.com 2-4 Valor™1000W Series Service Manual
2.2.3 Diagnostic Guide
TABLE 2-4. DIAGNOSTIC GUIDE
Symptom
Possible Cause
Remedy
Scale will not turn
on.
No power to scale
Battery power exhausted
Adapter defective
Input connector at rear of
balance may be defective
On/Off switch defective or
actuating fingers on top housing
defective.
Main PC Board defective.
Verify connections and voltage.
Connect power and charge battery.
Check the AC adapter voltage
output which should match the
specified voltage on the adapter.
If voltage is low or nonexistent,
replace the AC adapter. If OK,
Proceed.
Open the balance. Leave the cable
connected to the top housing.
Reconnect the AC adapter to the
balance. Check AC voltage at the
input connector terminals. It should
read 12 V AC.
If voltage is not present, replace the
input connector. If OK, proceed.
(Caution: disconnect the AC
adapter and remove power and/or
batteries from the balance for this
procedure, to prevent damage to the
ohmmeter.)
Open the balance. Using an ohm-
meter, measure the resistance
between the pins on the On/ Off
switch. It should be open. If
continuity is not present, replace the
switch.
Replace the Main PC Board.
Poor accuracy
Unstable environment
Balance out of calibration
Balance was not re-zeroed
before weighing.
Move scale to suitable location;
insure that balance is level.
Calibrate the balance.
Press Zero with no weight on the
pan, then weigh item.
Unable to calibrate
Unstable environment
Incorrect calibration mass
Up and down stops out of
adjustment.
Load Cell defective.
Move scale to suitable location.
Use correct calibration mass.
Remove the cover from the load
cell. Check the Overload Stops.
(See Section 3.7.) If OK, the load
cell is defective.
Replace the Load Cell. (See
Section 3.6.)

CHAPTER 2 DIAGNOSTIC GUIDE
Valor™1000W Series Service Manual 2-5 Ohaus Corporation www.ohaus.com
TABLE 2-4. DIAGNOSTIC GUIDE
Symptom
Possible Cause
Remedy
Scale flashes Bat
Battery discharged
Connect power and charge battery.
Battery fails to
charge fully
Battery is defective
Replace battery.
[ZEro-E]
Pan has excess load or is not
installed during power on
Remove excess weight or install
pan and re-zero
[-OVEr-]
Total weight on pan exceeds
full scale +9d
Reduce excess load from the pan
[n-OVEr]
Accumulation records exceed
999 limit
Clear Accumulation data
[A-OVEr]
Total Accumulation weight
exceeds no. of display digits
Clear Accumulation data
[Err-01]
Invalid under and over limit
settings
Re-enter under and over limits
[Ad-Lo]
Incorrect calibration setting or
calibration weight
Correct the calibration setting or
use correct calibration weight

CHAPTER 2 DIAGNOSTIC GUIDE
Ohaus Corporation www.ohaus.com 2-6 Valor™1000W Series Service Manual

CHAPTER 3 MAINTENANCE PROCEDURES
Valor™1000W Series Service Manual 3-1 Ohaus Corporation www.ohaus.com
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 another 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 the rechargeable battery and the scale malfunctions, first recharge the
battery to see if this resolves the problem.
5. Make a visual inspection for faulty connectors, wiring, and loose hardware.
3.2 SERVICE STRATEGY
All parts of the Valor 1000W are designed to be replaced rather than repaired. This includes the
Main Printed Circuit Board (PCB), the Load Cell, and the cables. For an illustrated list of
replaceable parts, see Chapter 5.
3.3 OPENING THE SCALE
Use these procedures in order to replace the Load Cell, any of the Printed Circuit Boards and/or
LCD Displays.
Common hand tools are sufficient to disassemble the Valor 1000W scales. Turn the scale off
and unplug the power cord before you begin.
1. Lift off the Weighing Pan from the Pan Support.

CHAPTER 3 MAINTENANCE PROCEDURES
Ohaus Corporation www.ohaus.com 3-2 Valor™1000W Series Service Manual
2. Turn the scale over. Remove the thirteen screws holding the two Housing covers in
place.
(See Figure 3-1.)
3. Remove the two housing
covers.
Figure 3-1. Valor 1000W Bottom with red circles
indicating the positions of the screws that secure the
two housing covers.
Figure 3-2. PCB Housing
3.4 Removing/Replacing the Main PCB
If the Main PCB is suspected of being faulty, they should be replaced, as follows:
1. Disconnect the Cable connecting the Main PCB to the scale’s power system.
(See Figure 3-2.)
2. Remove the two screws that secure each PCB to the Housing.
3. If either the Main PCB or the Load Cell is to be replaced, note the order of the wire
colors, and then remove the Load Cell Cables from the Main PCB. (See Figure 3-2.)
Main PCB
with cable
to Rear
Display PCB
Rear Display
PCB
Load Cell Cables
Rechargeable
Battery