OHAUS Valor 1000 User manual

ValorTM 1000 Series
Service Manual

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com i Valor 1000 Series Service Manual
Page No.
1GETTING STARTED 1
1.1 Introduction 1
1.2 Service Facilities 1
1.3 Technical Data 2
1.4 Tools and Test Equipment Required 2
1.5 Specification 2
1.6 Controls 5
1.6.1 Overview of the Controls 5
1.6.2 Main Application Screen 5
1.6.3 Turning Scale On/Off 6
1.6.4 Weighing 6
1.7 Legal for Trade (LFT) 6
1.7.1 Settings 6
1.7.2 Verification 6
1.7.3 Sealing 6
2DIAGNOSTIC GUIDE 8
2.1 Trouble Shooting 8
2.2 Diagnostic Guide 8
2.2.1 Diagnosis: 8
2.2.2 Checking Load Cells for Trouble 9
3MAINTENANCE / REPAIR PROCEDURES 11
3.1 Preventive Maintenance 11
3.2 Opening the Scale 12
3.3 Removing/Replacing the Main PCB 13
3.4 Removing/Replacing the Rear Display PCB 14
3.5 Removing/Replacing the Load Cell 15
3.6 Setting the Overload Stops 16
3.7 Replacing the Port PCB 17
3.8 Replacing the Function Label 18
4TESTING 19
4.1 Test Masses Required 19
4.2 Performance Tests 19
4.2.1 Precision Test 20
4.2.2 Repeatability Test 20
4.2.3 Linearity Test 22
4.2.4 Off-Center Load Test 23
4.2.5 Adjusting Off Center Load 23
5PARTS LISTS & DIAGRAMS 26
5.1 Non-Approved Models Spare Parts 26
5.2 Approved Models Spare Parts 28
APPENDIX A –SERVICE MENU 30
A.1 Service Menu Structure 30
A.2 Service Calibration 31

CHAPTER 1 - GETTING STARTED
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1 GETTING STARTED
1.1 Introduction
This service manual contains the information needed to perform routine maintenance and
service on the Ohaus Valor 1000 Series scales. Familiarity with the balance’s Instruction
Manual is assumed. The contents of this manual are contained in five chapters:
Chapter 1 Getting Started –Contains information on service facilities, tools 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 1000 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 balance, 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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1.3 Technical Data
Equipment Ratings: Indoor use only
Altitude: 2000m
Operating temperature: 0 to 40°C
Humidity: Maximum relative humidity 80% for temperatures up to 31 °C decreasing linearly
to 50% relative humidity at 40°C.
Electrical supply: 12VDC, 0.5A. For use with certified or approved power supply, which
must have a SELV and limited energy circuit output.
Voltage fluctuations: Mains supply voltage fluctuations up to ±10% of the nominal voltage.
Overvoltage category (Installation category): II
Pollution degree: 2
1.4 Tools and Test Equipment Required
Common hand tools
Standard electronics tool kit
1.5 Specification
Specifications for the Ohaus Valor 1000 Series scales are listed in Table 1-1, Table 1-2 and
Table 1-3. 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 –NON-APPROVED MODELS
Model*
V12P3
V12P6
V12P15
V12P30
Capacity ×Readability
(Max x d non-
approved)
6 lb x 0.001 lb
3 kg x 0.0005 kg
3,000 g x 0.5 g
96 oz x 0.02 oz
6 lb x 0.02 oz
15 lb x 0.002 lb
6 kg x 0.001 kg
6,000 g x 1 g
240 oz x 0.5 oz
15 lb x 0.5 oz
30 lb x 0.005 lb
15 kg x 0.002 kg
15,000 g x 2 g
480 oz x 0.1 oz
30 lb x 0.1 oz
60 lb x 0.01 lb
30 kg x 0.005 kg
30,000 g x 5 g
960 oz x 0.2 oz
60 lb x 0.2 oz
Maximum Displayed
Resolution
1:6,000
1:6,000
1:7,500
1:6,000
Repeatability
0.001 kg
0.002 kg
0.005 kg
0.01 kg
Linearity
±0.001 kg
±0.002 kg
±0.005 kg
±0.01 kg
Weighing Units
g, kg, lb, oz, lb:oz
Application Mode
Weighing
Tare Range
To capacity by subtraction
Stabilization Time
≤2 seconds
Power requirements**
4 x D cell Alkaline battery, AC adapter or rechargeable battery
Calibration
Digital with external weight
Typical Battery Life
1500 hours with backlight turned off
Construction
ABS plastic housing, stainless steel pan
Safe Overload
150% of capacity
Specified Temperature
Range
32 to 104°F / 0 to 40 °C
Display Type
Single display, LCD with white backlight
Display Size
1.0 in / 25.4 mm

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Pan Size
9.65 x 7.48 in / 245 x 190 mm
Scale Dimensions (W
x D x H)
10.2 x 10.6 x 4.8 in / 260 x 270 x 122 mm
Shipping Dimensions
(W x D x H)
12.6 x 12.6 x 6.9 in / 319 x319 x175 mm
Net Weight
5.5 lb / 2.5 kg
Shipping Weight
6.8 lb / 3.1 kg
TABLE 1-2. SPECIFICATIONS –APPROVED MODELS
Model
V12P2T
V12P5T
V12P10T
V12P20T
Capacity ×Readability
(Max x d non-approved)
5 lb x 0.0005 lb
2 kg x 0.0002 kg
2,000 g x 0.2 g
80 oz x 0.01 oz
10 lb x 0.001 lb
5 kg x 0.0005 kg
5,000 g x 0.5 g
160 oz x 0.02 oz
20 lb x 0.002 lb
10 kg x 0.001 kg
10,000 g x 1 g
320 oz x 0.05 oz
50 lb x 0.005 lb
20 kg x 0.002 kg
20,000 g x 2 g
800 oz x 0.1 oz
Maximum Displayed
Resolution
1:10,000
1:10,000
1:10,000
1:10,000
Certified Capacity ×
Readability
(Max x e approved)
5 lb x 0.002 lb
2 kg x 0.001 kg
2,000 g x 1 g
80 oz x 0.05 oz
10 lb x 0.005 lb
5 kg x 0.002 kg
5,000 g x 2 g
160 oz x 0.1 oz
20 lb x 0.01 lb
10 kg x 0.005 kg
10,000 g x 5 g
320 oz x 0.2 oz
50 lb x 0.02 lb
20 kg x 0.01 kg
20,000 g x 10 g
800 oz x 0.5 oz
Approved Resolution
1:2,000
1:2,500
1:2,000
1:2,000
Repeatability
0.001 kg
0.002 kg
0.005 kg
0.01 kg
Linearity
±0.001 kg
±0.002 kg
±0.005 kg
±0.01 kg
Class
Class III NTEP / Measurement Canada
Weighing Units
g, kg, lb, oz
Application Mode
Weighing
Tare Range
To capacity by subtraction
Stabilization Time
≤2 seconds
Power requirements
4 x Alkaline battery (not included) or AC adapter (included)
Calibration
Digital with external weight
Typical Battery Life
750 hours
Construction
ABS plastic housing, stainless steel pan, in-use cover
Safe Overload
150% of capacity
Communication
Optional RS232
Specified Temperature
Range
32 to 104°F / 0 to 40 °C
Display Type
LCD (front and back of scale) with white backlight
Display Size
1.0 in / 25.4mm
Pan Size
9.65 x 7.48 in / 245 x 190 mm
Scale Dimensions (W x
D x H)
10.2 x 10.6 x 4.8 in / 260 x 270 x 122 mm
Shipping Dimensions
(W x D x H)
12.6 x 12.6 x 6.9 in / 319 x319 x175 mm
Net Weight
5.5 lb / 2.5 kg
Shipping Weight
6.8 lb / 3.1kg

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TABLE 1-3. SPECIFICATIONS –APPROVED MODELS
Model
V12P3T
V12P6T
V12P15T
V12P30T
Capacity ×Readability
(Max x d non-approved)
3 kg x 0.0002 kg
3000 g x 0.2 g
6 kg x 0.0005 kg
6000 g x 0.5 g
15 kg x 0.001 kg
15000 g x 1 g
30 kg x 0.002 kg
30000 g x 2 g
Maximum Displayed
Resolution (d)
1:15,000
1:12,000
1:15,000
1:15,000
Model
V12P3T-M
V12P6T-M
V12P15T-M
V12P30T-M
Capacity ×Readability
(Max x e approved)
3 kg x 0.001kg
3000 g x 1 g
6 kg x 0.002 kg
6000 g x 2 g
15 kg x 0.005 kg
15000 g x 5 g
30 kg x 0.01 kg
30000 g x 10 g
Approved Resolution
1:3,000
1:3,000
1:3,000
1:3,000
Repeatability
0.001 kg
0.002 kg
0.005 kg
0.01 kg
Linearity
±0.001 kg
±0.002 kg
±0.005 kg
±0.01 kg
Weighing Units
g, kg
Application Mode
Weighing
Tare Range
To capacity by subtraction
Stabilization Time
≤2 seconds
Power requirements
4 x Alkaline battery (included), AC adapter (optional) or rechargeable battery
(optional)
Calibration
Digital with external weight
Typical Battery Life
750 hours
Construction
ABS plastic housing, stainless steel pan
Safe Overload
150% of capacity
Communication
Optional RS232
Specified Temperature
Range
0 to 40 °C
Display Type
LCD (front and back of scale) with white backlight
Display Size
25.4mm
Pan Size
245 x 190 mm
Scale Dimensions (W x
D x H)
260 x 270 x 122 mm
Shipping Dimensions
(W x D x H)
319 x319 x175 mm
Net Weight
2.5 kg
Shipping Weight
3.1 kg
Special Note regarding Approved models:
The specifications for the approved scales below are only for initial testing. These scales must be
tested according to the requirements of the local Weights and Measures authority. Before returning
the scale to service an approved representative of the local Weights and Measures authority must
certify the scale.

CHAPTER 1 - GETTING STARTED
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1.6 Controls
1.6.1 Overview of the Controls
TABLE 1-4 CONTROL FUNCTIONS
Button
Functions
Press (when off): Turns the scale on
Short Press (when on): Sets display to zero
Long Press (when on): Turns the scale off
Press (in Menu): Confirm（Enter）
Short Press: Enters / clears a Tare value
Long Press: Enters User Menu
Press (in Menu): Changes menu selections (Forward)
1.6.2 Main Application Screen
Item
Description
1
Battery charge symbol
2
Center of Zero symbol
3
Negative symbol
4
Stable weight symbol
5
NET symbol

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1.6.3 Turning Scale On/Off
Press On/Off to turn the scale on. The scale will find and set the zero weight point
automatically after it displays the software version.
In weighing mode, short press On/Off for more than 3 seconds to turn the scale off.
1.6.4 Weighing
Once the scale has a stable zero weight and the tare weight of any packaging or
container has been captured, place the product being weighed on the platform -- the
display will show the weight of the product in the selected unit of measure.
1.7 Legal for Trade (LFT)
When the scale is used in trade or a legally controlled application, it must be set up, verified
and sealed in accordance with local weights and measures regulations. It is the responsibility
of the purchaser to ensure that all pertinent legal requirements are met. As the requirements
vary by jurisdiction, the purchaser is advised to contact their local weights and measures office
for instructions about putting the scale into service.
1.7.1 Settings Before verification and sealing, perform the following steps:
1. Confirm that the selected unit of measure is permitted by the local weights and
measures regulations.
2. Perform a calibration refer to user manual in Section 4.1.
3. Set the position of the security switch as shown in Section 1.7.3.
1.7.2 Verification
A weights and measures official must perform the verification procedure. Contact the
local weights and measures office for more information.
1.7.3 Sealing A LFT switch under the sealing cover is used to secure the menu settings. When the
switch is pressed, the menu settings may be viewed but not changed. This sealing
cover is located at the bottom of the scale. Remove the sealing cover with a
screwdriver and then press the switch when the scale is powered on. After that you
will see "LFt .ON" is displayed on the screen.
LFT switch cover
LFT switch

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After the scale has been verified, it must be sealed by the weights and measures
official to prevent undetected access to the legally controlled settings. Refer to the
illustrations below for the sealing.
Wire Sealing

CHAPTER 2 - DIAGNOSTIC GUIDE
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2 DIAGNOSTIC GUIDE
This section of the manual contains troubleshooting information. Information is contained to
isolate specific problems using Table 2-2, Diagnostic Guide. Follow all directions step by step.
Make certain that the work area is clean. Handle balance components with care. Use
appropriate electro-static protection devices to prevent damage to the sensitive electronic
components.
2.1 Trouble Shooting
General procedures for Troubleshooting:
1. Do the most obvious, user-level remedies.
2. Visual Check:
- Check that the internal parts are clean and free from debris.
- Examine the balance for damage or signs of abuse, replace any damaged items.
3. Use the error code table for solutions for specific codes.
4. Use the Diagnostic Guide; locate the symptom then follow the suggested remedies in
order.
Note: Allow the scale to warm up for approximately five minutes after stabilizing to room
temperature.
2.2 Diagnostic Guide
Diagnostic Guide designed to help locate the problem area quickly and easily. The probable
causes are listed with the most common cause first. If the first remedy does not fix the
problem, proceed to the next remedy. Before attempting to repair the balance, read all
chapters of this manual to be familiar with the balance components and operation.
2.2.1 Diagnosis:
1. Isolate and identify the symptom.
2. Refer to Diagnostic Guide tables and locate the symptom.
3. Follow the suggested remedies in the order they appear.
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.

CHAPTER 2 - DIAGNOSTIC GUIDE
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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.
2. Perform a Resistance Test, to determine if the Load Cell is severely damaged or a short
circuit to the frame has occurred.
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)
Ex+ to Ex–
S+ to S–
404 ±10
350 ±10

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TABLE 2-2 DIAGNOSTIC GUIDE
Sympto
m
Possible Cause
Possible Solution
CAL E
Calibration error: unstable
environment or incorrect calibration
weight
Check environment and
calibration weights, and
then re-calibrate.
Err 8.1
The Power On weight on the
platform exceeds the zero range.
Clear pan.
Err 8.2
The Power On weight on the
platform is below the zero range.
Check if pan is missing.
Err 8.3
Over load (weight exceeds rated
capacity)
Remove weight from pan.
Err 8.4
Under load (pan removed)
Re-install pan.
Err 8.5
Tare weight out of range
Tare value exceeds
maximum.
Err 9.5
Internal data error or calibration data
error
Contact OHAUS or your
authorized dealer for help.
Err 13
Failure to write to EEPROM
Contact OHAUS or your
authorized dealer for help.
Lo.Bat
Battery very low
Replace batteries; Charge
rechargeable battery.
--NO--
Action not allowed
/
------
Busy
/

CHAPTER 3 - MAINTENANCE PROCEDURES
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3 MAINTENANCE / REPAIR 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 another 20
minutes after turning the scale on, for the scale electronics to stabilize
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.
Service Strategy
All parts of the Valor 1000 are designed to be replaced rather than repaired. This includes
the Main Printed Circuit Board (PCB), the Load Cell, and the Feet etc. For an illustrated list
of replaceable parts, see Chapter 5.

CHAPTER 3 - MAINTENANCE PROCEDURES
Valor 1000 Series Service Manual 12 Ohaus Corporation www.ohaus.com
3.2 Opening the Scale
Use these procedures in order to replace the Load Cell, any of the Printed Circuit Boards
and/or LCD Displays.
Separating the Top and Bottom Housings
Common hand tools are sufficient to disassemble the Valor 1000 scales. Turn the scale off
and unplug the power cord or remove the battery before you begin.
1. Lift off the Weighing Pan from the Pan Support.
2. Remove the Pan Support.
3. Turn the scale over. Remove the five screws on the bottom and one screw under the
LFT cover.
4. Separate Top Housing from Bottom Housing. Avoid straining the cables that connect
the Main PCB to the parts in the Bottom Housing. (Lay the two housings close to each
other, so cable is not strained.)
Figure 3-1 Top and Bottom Housings: Approved Model.
Rear
display
PCB
Main PCB
Loadcell cable
leads soldered to
the Main PCB
Loadcell
Frame
Remove 6 screws
Port PCB

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Figure 3-2 Top and Bottom Housings: Non-approved Model.
Note：Unsealing before this step for the approval models.
3.3 Removing/Replacing the Main PCB
If the PCBs are suspected of being faulty, they should be replaced, as follows:
1. Disconnect the Cable connecting the Main PCB to the scale’s power system, for the approved
model, please disconnect the cable of rear display PCB (See Figure 3-3 and Figure 3-4.)
2. Remove the four screws that secure each PCB to the Top Housing.
3. If either the Main PCB or the Load Cell is to be replaced, note the order of the wire colors, then
carefully cut off the hot melt glue and unsolder the Load Cell Cable from the Main PCB at the
four solder points on the PCB. (See Figure 3-3 and Figure 3-4.)
Figure 3-3 Main PCB: Non-approved Model.
Loadcell cable
leads soldered to
the Main PCB
Main PCB
Loadcell
Frame
Port PCB

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Figure 3-4 Main PCB: Approved Model.
4. Reverse the disassembly procedure to assemble the Load cell PCB.
3.4 Removing/Replacing the Rear Display PCB
1. Disconnect the Cable connecting the Main PCB to Rear Display PCB. (See Figure 3-1.)
2. Remove 2 screws indicated in Figure 3-5, take out the display PCB
3. Position the replacement PCB, insert and tighten the screws, screws should be fixed in the slot
of the plastic ribs.
4. Connect the Rear Display PCB Cable to the Main PCB.
Figure 3-5 Rear Display PCB.

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3.5 Removing/Replacing the Load Cell
A Load Cell that is even slightly bent or corroded should be replaced. The Load Cell may also need
to be replaced because of instability, or because the scale does not calibrate or repeat. Note: The
Load Cell is supplied as an assembled unit. (See Chapter 5.)
1. Carefully cut off the hot melt glue. Unsolder the cable leads connecting the Load Cell to the
PCB. (See Figure 3-3 or Figure3-4.)
2. Remove the bolts that hold the Load Cell Frame to the Load Cell. Use a high-leverage socket
wrench (10mm). (The bolts are tightened to about 10 Nm torque.)
Figure 3-6. Removing bolts holding Frame
to the Load Cell.
Note: There are one or several shim between the Load Cell Frame and the Load Cell. Be
careful not to lose it.
3. Turn the scale over and remove the bolts and washers that hold the Load Cell to the Bottom
Housing.
Figure 3-7. Removing bolts holding Frame
to the bottom housing

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Note: The shims are used between the Load Cell and its base. Be careful not to lose it.
4. Lift the Load Cell away from the housing.
5. When installing the replacement Load Cell, first position the shim, then insert and tighten the
two bolts and their washers in the Bottom Housing.
6. Place the cover on the Bottom Housing’s cavity where the two Load Cell bolts are inserted.
Insert the small cover screws and tighten them.
7. Position the shim and Load Cell Frame on top of the Load Cell. Insert the bolts and their
washers, and tighten the bolts. (The bolts are tightened to about 10 Nm torque.)
8. Solder the cable leads connecting the Load Cell to the PCB, See the color code of load cell in
table 3-1.
TABLE 3-1. COLOR CODE FOR LOAD CELL WIRE
EXE+
SIG+
SIG–
EXE–
SCR
RED
GREEN
WHITE
BLACK
SHIELDED
WIRE
9. Cover the solder points with the hot melt glue.
10. Set Overload Stops as shown in Section 3.6.
3.6 Setting the Overload Stops
The Overload Stop gaps must be checked and reset if the Load Cell or the LC plate are replaced for
the Models with Capacity of 2kg and 3kg ONLY. Please use the 0.5mm plug-in metal sheet/ gauge to
adjust the Overload Stop gaps, otherwise please measure the gap with 0.5mm after adjusting the
screw. (See Figure 3-8.)
Note: Do not adjust the overload screw hard, stop when the screw touch with the metal sheet to
prevent from the material rebounding.

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Figure 3-8. Adjust the overload stop screw
3.7 Replacing the Port PCB
1. Remove cable from main PCB
2. Remove 3 screws indicated in Figure 3-9
Figure 3-9. Port PCB
3. Unsolder the leads connecting the battery metal sheet. See Figure 3-10, and lift the Port PCB.
Figure 3-10. Unsolder the leads on the port PCB
4. Reverse the disassembly procedure to assemble the Port PCB.