Penn Scale V71P1502T Service Manual

SERVICE MANUAL

VALOR™ 7000

Ohaus Corporation, 7 Campus Drive, Suite 310, Parsippany, NJ 07054 [phone]

SERVICE MANUAL

VALOR ™ 7000

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.

30072403 © Copyright 2013 Ohaus Corporation, all rights reserved.

TM Registered trademark of Ohaus Corporation.

TABLE OF CONTENTS

Ohaus Corporation www.ohaus.com i Valor™ 7000 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 Valor 7000 .....................................................................................1-3

1.5.1 Overview of the Controls ...................................................................................1-3

1.5.2 Power On/Off ....................................................................................................1-4

1.5.3 Menu Setup ......................................................................................................1-5

1.5.4 Menu Navigation ...............................................................................................1-5

1.6 Legal For Trade .......................................................................................................1-6

1.7.1 Settings .............................................................................................................1-6

1.7.2 Verification ........................................................................................................1-6

1.7.3 Sealing ..............................................................................................................1-6

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

3.4 Removing/Replacing the Main Printed Circuit Board (PCB) .....................................3-3

3.5 Removing/Replacing the Load Cell ..........................................................................3-4

3.6 Setting the Overload Stops ......................................................................................3-5

3.7 Removing/Replacing the Rechargeable Battery .......................................................3-7

3.8 Replacing the Function Label ...................................................................................3-7

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

TABLE OF CONTENTS

Valor™ 7000 Series Service Manual ii Ohaus Corporation www.ohaus.com

CHAPTER 5 DRAWINGS AND PARTS LISTS

5-1 Valor 7000 Scale: Housing & Internal Parts .............................................................5-2

Appendix A STANDARD CALIBRATION

A.1 Calibration ............................................................................................................... A-1

A.2 Setup and Calibration .............................................................................................. A-2

Appendix B SERVICE CALIBRATION

B.1 Service Menu Structure ........................................................................................... B-1

B.2 Entering the Service Menu ...................................................................................... B-1

B.3 Capacity Menu ........................................................................................................ B-2

B.4 Graduation Menu .................................................................................................... B-2

B.5 Service Span Calibration ......................................................................................... B-2

B.6 Service Linearity Calibration .................................................................................... B-3

B.7 Ramp Menu ............................................................................................................ B-4

B.8 Expand Menu .......................................................................................................... B-4

B.9 End Menu ............................................................................................................... B-4

LIST OF TABLES

TABLE NO. TITLE Page No.

1-1 Specifications ......................................................................................................1-2

1-2 Controls Functions ...............................................................................................1-3

1-3 Battery Charge Status .........................................................................................1-4

1-4 Menu Structure ....................................................................................................1-5

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 3.3V Excitation) ......................................2-3

2-4 Diagnostic Guide .................................................................................................2-6

3-1 Mounting Bolt Torque Settings .............................................................................3-5

3-2 Overload Stop Gap Settings ................................................................................3-6

4-1 Test Mass Values ................................................................................................4-1

4-2 Repeatability Worksheet ......................................................................................4-4

4-3 Linearity Test Masses ..........................................................................................4-5

5-1 Housing & Internal Parts ......................................................................................5-3

LIST OF ILLUSTRATIONS

FIGURE NO. TITLE

1-1. Front Display with controls ...................................................................................1-3

1-2. Back Display ........................................................................................................1-4

1-3 LFT Lock Switch and Seal ...................................................................................1-6

2-1 Main Printed Curcuit Board ..................................................................................2-3

3-1 Screws securing Top Housing .............................................................................3-2

3-2 Top and Bottom Bottom .......................................................................................3-2

3-3 Main Printed Circuit Board ...................................................................................3-3

3-4 Bolts holding Frame to the Load Cell ...................................................................3-4

3-5 Overload stops ....................................................................................................3-5

3-6 Overload Gap positions .......................................................................................3-6

3-7 Rechargeable Battery ..........................................................................................3-7

4-1 Scale drawing of Load Cell and Weighing Pan ....................................................4-6

5-1 Housing & Internal Parts ......................................................................................5-2

CHAPTER 1 GETTING STARTED

Valor™ 7000 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 7000 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 7000 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, and to set the service menu units.

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.

1.3 TOOLS AND TEST EQUIPMENT REQUIRED

The service shop should contain the following equipment:

1. Standard hand tools.

2. Digital Voltmeter (DVM).

3. Standard Electronics tool kit.

4. Grounding mat and clip.

5. Strain Gauge Simulator.

CHAPTER 1 GETTING STARTED

Ohaus Corporation www.ohaus.com 1-2 Valor™ 7000 Series Service Manual

1.4 SPECIFICATIONS

Complete specifications for the Ohaus Valor 7000 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

V71P1502T

V71P3T

V71P6T

V71P15T

V71P30T

Capacity

1.5 kg
3 lb

3 kg

6 lb

6 kg

15 lb

15 kg

30 lb

30 kg

60 lb

Min (20e)

0.01kg

0.02kg

0.04kg

0.1kg

0.2kg

0.02lb

0.04lb

0.1lb

0.2lb

0.4lb

Standard readability
d=

0.00005 kg

0.0001 lb

0.0001 kg

0.0002 lb

0.0002 kg

0.0005 lb

0.0005 kg

0.001 lb

0.001 kg

0.002 lb

LFT ON readability
e=10d=

0.0005 kg

0.001 lb

0.001 kg

0.002 lb

0.002 kg

0.005 lb

0.005 kg

0.01 lb

0.01 kg

0.02 lb

Standard
Resolution

1:30000

1:30000

1:30000

1:30000

1:30000

LFT ON
Resolution (nMax)

1:3000

1:3000

1:3000

1:3000

1:3000

Linearity 2d

0.0001 kg

0.0002 kg

0.0005 kg

0.001 kg

0.002 kg

Repeatability 2d

0.0001 kg

0.0002 kg

0.0005 kg

0.001 kg

0.002 kg

Hysteresis 2d

0.0001 kg

0.0002 kg

0.0005 kg

0.001 kg

0.002 kg

Off Center Load 2d

0.0001 kg

0.0002 kg

0.0005 kg

0.001 kg

0.002kg

Creep (60s, 2d)

0.0001 kg

0.0002 kg

0.0005 kg

0.001 kg

0.002 kg

Creep (30 min.

0.5e) MPE

0.0002 kg

0.0005 kg

0.001 kg

0.002 kg

0.005 kg

Stabilization Time

1 sec.

1 sec.

1 sec.

1 sec.

1 sec.

Combined effect
(Increasing /
Decreasing Load)

MPE

MPE

MPE

MPE

MPE

Zero Drift vs.
Temp 2d/C

0.0001 kg / C

0.0002 kg / C

0.0005 kg / C

0.001 kg / C

0.002 kg / C

Span Drift vs. Temp
1d/C,
Less or equal than
MPE

16.7ppm / C

16.7ppm / C

16.7ppm / C

16.7ppm / C

16.7ppm / C

Operating
Conditions

-10C to 40C

-10C to 40C

-10C to 40C

-10C to 40C

-10C to 40C

Storage
Temperature

-40C to 60C

-40C to 60C

-40C to 60C

-40C to 60C

-40C to 60C

Pan Size

225 x 300 mm

225 x 300 mm

225 x 300 mm

225 x 300 mm

225 x 300 mm

CHAPTER 1 GETTING STARTED

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1.5 SCALE OPERATION – VALOR 7000

This section contains information on the basic operation of the Valor 7000 scale.

1.5.1 OVERVIEW OF THE CONTROLS

Figure 1-1. Valor 7000 Front Display with controls.

TABLE 1-2. Control functions Valor 7000

Button

Functions

On/Zero

Off

3

Yes

Short Press1 (when on): Sets display to zero
(when off): Turns scale on
Long Press2 (when on): Turns the scale off
Short Press (in Menu): Selects/accepts displayed setting

Print
Units
No

Short Press: See Interface Manual for operation description.
Long Press: Toggles through active weighing units
Short Press (in Menu): Toggles through available settings

Function
Mode
Back

Short Press: Selects function setting
Long Press: Selects active Mode
Short Press (in Menu): returns to previous settings

M+

Menu
Exit

Short Press: Accumulates the weight and displays the
accumulated information at 0 load.
Long Press: Enters User Menu
Short Press (in Menu): Quickly exit User Menu

Tare

Short Press: Enter/clear a tare value. Clears the
accumulation when the accumulation
information is displayed.

TheIRSensorcanbeprogrammedtoactas“touchless”

buttons. See section 4.3 for the available settings.

Notes: 1 Short Press: Press less than 1 seconds.

2

Long Press: Press and hold for more than 2 seconds.

3

Press and hold the Off button until OFF is displayed, then release the button.

CHAPTER 1 GETTING STARTED

Ohaus Corporation www.ohaus.com 1-4 Valor™ 7000 Series Service Manual

IR Sensor (back)

Figure 1-2. Valor 7000 Back Display.

1.5.2 Power ON/OFF

To turn the scale on, press and hold the On/Zero Off button for 1 second. The scale
performs a display test, momentarily displays the software version, and then enters the
active weighing mode.

To turn the scale off, press and hold the On/Zero Off button until OFF is displayed.

The scale can be used on AC power immediately. Allow the battery to charge for 12
hours before using the scale on battery power. The Scale will automatically switch to
battery operation if there is a power failure or the power cord is removed. With AC
power, the scale is constantly charging, so the battery charge indicator (see item 11 in
figure 3-2) will remain lit. The scale can be operated during charging, and the battery is
protected against overcharging.

For maximum operating time, the battery should be charged at room temperature.

During battery operation, the battery symbol indicates the battery charge level
remaining. The indicator will automatically turn off when the batteries are fully charged.

TABLE 1-3

Symbol

Charge level

0 to 10 % Remaining

11 to 40 % Remaining

41 to 70 % Remaining

71 to 100 % Remaining

Notes:

When battery symbol blinks fast, approximately 30 minutes working time is left.
When [lo.bat] is displayed, the scale will shut off.
Charging the scale must be performed in a dry environment.

CAUTION: Battery is to be replaced only by an authorized Ohaus
service dealer. Risk of explosion can occur if the rechargeable
battery is replaced with the wrong type or if it is not properly
connected. Dispose of the lead acid battery according to local laws
and regulations.

LED Indicators

CHAPTER 1 GETTING STARTED

Valor™ 7000 Series Service Manual 1-5 Ohaus Corporation www.ohaus.com

1.5.3 Menu Setup

Programmable features of the Valor 7000 scales are contained in menus which are
accessedthroughtheDisplayPanel’scontrolswitches.SeetheInstruction Manual for a full
description of the menus and how to access them.

TABLE 1-4. Valor 7000 MENU STRUCTURE

Menu:

C.A.L

S.E.t.U.P

r.E.A.d

M.O.d.E

Menu
Items:

Span

Lin

GEO

End

Reset

Pwr.Un

Zero

A. Tare

Bp.Sig

Bp.Key

IR Func

IR Adj

Accum

End

Reset

Stable

Filter

AZT

Light

A.Off

End

Reset
Weigh
Percnt
Check

End

U.n.i.t

P.r.i.n.t

C.O.M

L.O.C.k

E.n.d

Menu
Items:

Reset

kg

g

lb

oz

lb:oz

End

Reset

Stable

A.Print

Contnt

Layout

Data.Tr

End

Reset

Baud

Parity

Stop

Handsh

Alt.Cm

End

L.Cal

L.Setup

L.Read

L.Mode

L.Unit

L.Print

L.COM

End

1.5.4 Menu Navigation

Press and hold Menu until [mMeNU] (Menu) is displayed. When released the first sub-menu
[C.a.l] (Cal) will be shown.
Summary of button navigation functions in menu mode:

-- Yes Allows entry into the displayed menu.

- Accepts the displayed setting and advances to the next item.

-- No Skips by the displayed menu.

- Rejects the displayed setting or menu item and advances to the next
available item.

-- Back Moves backwards through the upper and middle level menus.

- Backs out of a list of selectable items to the previous middle level menu.

-- Exit Exits from menu directly to the active weighing mode.

CHAPTER 1 GETTING STARTED

Ohaus Corporation www.ohaus.com 1-6 Valor™ 7000 Series Service Manual

1.6 LEGAL FOR TRADE

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.
The Menu Lock switch limits changes to the Cal, Setup, Readout, Unit and Print menus. The
switch in type approved models may set some scale settings as required by the approval
agency. The switch may be secured using paper or wire seals.

Note: When LEGAL FOR TRADE is set to ON (LFT Switch in locked position), the menu
settings are affected as follows:
Calibration (C.A.L) menu is not accessible
Zero Range is locked at 2%
Stable Range setting is locked at 1d
Auto-Zero Tracking setting is locked at 0.5d
Units are locked at their current settings
Filter is locked at current setting
Stable Only is locked On
Auto Print/ Continuous is disabled
Lb:oz is locked Off.

1.6.1 Settings
Before verification and sealing, perform the following steps:

1. Verify that the menu settings meet the local weights and measures regulations.

2. Perform a calibration, see instruction manual.

3. Set the switch to Locked. See figure 1-3.

1.6.2 Verification

The local weights and measures official or authorized service agent must perform the
verification procedure.

1.6.3 Sealing

The local weights and measures official or authorized service agent must apply a security
seal to prevent tampering with the settings. Refer to the illustration below for sealing
methods.

Paper Seal

Wire Seal
Unlocked Locked with Paper Seal Locked with Wire Seal

Lock Switch

CHAPTER 1 GETTING STARTED

Valor™ 7000 Series Service Manual 1-7 Ohaus Corporation www.ohaus.com

Figure 1-3. Sealing

CHAPTER 2 DIAGNOSTIC GUIDE

Valor™ 7000 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 2-4, 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 Device.

2.2 DIAGNOSTIC GUIDE

Table 2-4 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 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 Table 2-4, 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.

CHAPTER 2 DIAGNOSTIC GUIDE

Ohaus Corporation www.ohaus.com 2-2 Valor™ 7000 Series Service Manual

2.2.2 Checking Load Cells for Trouble

1. 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)

Model

Ex+ to Ex–

S+ to S–

Ex+ to S–

Ex+ to S+

Ex– to S+

Ex– to S–

All models

404 ± 10

350 ± 4

289 ± 10

289 ± 10

289 ± 10

289 ± 10

2. 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 solder
contacts can be used as measuring points. See Figure 2-1.

The EXE+ and EXE– wires should be connected to the PCB, and the SIG+ and SIG–
wires must be disconnected. Record the colors for each wire connection before
disconnecting. (See Table 2-2 for typical color code for Valor 7000.)

TABLE 2-2. COLOR CODE FOR LOAD CELL WIRING*

AMI

BLACK

GREEN

WHITE

RED

EXE–

EXE+

SIG+

SIG–

*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 4 and 1 of
Load Cell connection on the PCB (+EXE and –EXE). This voltage must be
approximately 3.1 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 3.1 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™ 7000 Series Service Manual 2-3 Ohaus Corporation www.ohaus.com

CAUTION:

IN THE NEXT STEP, DO NOT OVERLOAD THE SCALE BEYOND FULL
CAPACITY RATING.

– Measure the voltages on +SIG and –SIG wires, disconnected from PCB.

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.

Figure 2-1. Top view of main PCB.

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/V with 3.1V Excitation)

Model/Capacity

Zero Load

50% Load

100% Load

V71P1502T / 1.5kg

0.492666667

0.992666667

1.49266667

V71P3T / 3kg

0.2956

0.8956

1.4956

V71P6T / 6kg

0.1478

0.7478

1.3478

V71P15T / 15kg

0.0739

0.8239

1.5739

V71P30T / 30 kg

0.03695

0.78695

1.53695

CHAPTER 2 DIAGNOSTIC GUIDE

Ohaus Corporation www.ohaus.com 2-4 Valor™ 7000 Series Service Manual

2.2.3 Testing the Printed Circuit Board (PCB)

The PCB can be tested by measuring voltages and by using a simulator. The simulator replaces
the Load Cell during testing and is a useful tool for diagnosing problems.

PCB Voltage Measurements

Note: Prior to the voltage measurements, the battery should be fully charged and tested.

1. Disconnect power from the scale, and remove the Top housing. (See Section 3.3.1.)

CAUTION: Disconnect the power from the scale before opening the housing.

2. Connect the AC Adapter to the scale and turn the scale on.

3. Using a DVM, measure the excitation voltage (EXE+ and EXE– in Figure 2-1.)
The reading should be 3.1 volts dc. This is the excitation voltage for the Load Cell
and is regulated. If the voltage is lower, replace the PCB. (See Section 3.4.)
Then perform Operational Tests. (See Chapter 4.)

4. Measure incoming power from the transformer connector shown in Figure 2-1. The
voltage should read 0 volts with power off and above 12 Volts dc with power on.

5. Perform simulator testing.

Simulator Testing

To perform these tests, the use of a Simulator is required. The function of a Simulator is to
simulate the output of a full bridge Load Cell, allowing the scale to be separated from the Load
Cell for the purposes of troubleshooting and calibration. The Load Cell used in the scale is rated
at 2mV/V output with a 3.1 Volt excitation voltage applied.

CHAPTER 2 DIAGNOSTIC GUIDE

Valor™ 7000 Series Service Manual 2-5 Ohaus Corporation www.ohaus.com

General Load Test

This test checks the Main PC Board circuitry by simulating accurate Load Cell voltages at zero
load, 50% and 100% load capacities.

Disconnect power from the scale, and remove the Top housing. (See Section 3.3.1.) Leave the
Mechanical Switch connected to the scale. Disconnect the battery.

1. Disconnect the Load Cell cable from the main PC Board.

2. With the Simulator set to zero, solder its cable leads to their counterparts on the
PCB, using the Load Cell Cable solder points on the PCB. (See Figure 2-1.).

3. Connect a known good AC Adapter to the scale and connect to a power source.

4. Turn on the scale. An under load error may appear. This is normal.

5. Set the scale to indicate weight in kilograms (kg) and set the calibration value to
maximum span value.

6. Adjust the Simulator to simulate 0% load, 50% load and 100% load for the capacity

that the scale is rated for. (See Table 2.3 for values to use.) If the resulting readings
are unstable, the Main PC Board is defective.

7. Use the Simulator to calibrate the scale in the next procedure to verify if the Main PC

Board is good or bad.

Calibration Test

This test calibrates the scale using the simulator and can verify that the Main PC Board is
functioning properly or improperly.

1. With the scale on, enter the scale menu and perform a span calibration.
(See Appendix A.)

2. Follow the scale prompts. When the scale indicates a given weight to be placed
on the scale, set the simulator to an equivalent value based on Table 2-3.

3. Upon completion of calibration, the PCB can be further checked using the Simulator
to simulate various weight values. If simulator settings and weight readings on the
scale agree, the PCB is functional. If the scale readings vary, or do not agree with
readings in Table 2-3, the Main PC Board is defective and should be replaced.
(See Chapter 3.)

CHAPTER 2 DIAGNOSTIC GUIDE

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2.2.4 Diagnostic Guide

TABLE 2-4. 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

LFT locked

See chapter 5 for more information

Cannot access mode

Mode not enabled

Enter menu and enable mode

Cannot access unit

Unit not enabled

Enter menu and enable unit

Battery icon flashing

Low Battery error

Connect the scale to AC power and
charge the battery

Err 8.1

Power On Error

Weight reading exceeds Power On Zero
limit

Err 8.2

Power On Error

Weight reading below Power On Zero
limit

Err 8.3

Over Range Error

Weight reading exceeds Overload limit

Err 8.4

Under Range Error

Weight reading below Underload limit

Err 8.5

Tare out of range

Adjust tare value to be within range

Err 8.6

Display overflow

Weight exceeds 6 digits.

Err 9.5

Calibration data error

Calibration data not present

-------

Busy

Displayed during tare setting, zero
setting, printing

--NO--

Action not allowed

Function not executed

CAL E

Calibration error
Unstable environment
Incorrect calibration
weight

Calibration value outside allowed limits
Move the scale to suitable location
Use correct calibration weight

Lo.rEF

Low reference weight
warning

Increase reference weight

rEF.Err

Unacceptable reference
weight

Reference weight too small. Weight on
the pan is too small to define a valid
reference weight. Increase reference
weight

Battery fails to charge
fully

Battery is defective

Have battery replaced by Ohaus
authorized service dealer.

CHAPTER 3 MAINTENANCE PROCEDURES

Valor™ 7000 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 7000 are designed to be replaced rather than repaired. This includes the
Main Printed Circuit Board (PCB) and Switches 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.

CHAPTER 3 MAINTENANCE PROCEDURES

Ohaus Corporation www.ohaus.com 3-2 Valor™ 7000 Series Service Manual

3.3.1 Separating the Top and Bottom Housings

Common hand tools are sufficient to disassemble the Valor 7000 scales. Turn the scale off and
unplug the power cord before you begin.

1. Lift off the Weighing Pan.

2. Turn the scale over. Remove the eight screws holding the Housing in place.
(See Figure 3-1.)

3. Move the top housing a little bit
backward and then raise and remove
the top housing.

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. Ranger 3000 Bottom.

Figure 3-2. Top and Bottom Housings

Figure 3-1. Screws (marked with white
circles) that secure the housing.

Main
PCB

Load
Cell
Frame

Load Cell Cable
leads.

Display
PCB

CHAPTER 3 MAINTENANCE PROCEDURES

Valor™ 7000 Series Service Manual 3-3 Ohaus Corporation www.ohaus.com

3.4 Removing/Replacing the Main PCB and Display 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.
(See Figure 3-2.)

2. Remove the four screws that secure the PCB to the bottom housing.

3. If either the Main PCB or the Load Cell is to be replaced, note the order of the wire

colors and then disconnect the Load Cell Cable from the Main PCB.

(See Figure 3-2.)

4. Position the replacement PCB as in Figure 3-2, insert and tighten the screws.

5. Re-connect the Load Cell Cables to the PCB, in the same position as originally

installed.

6. Re-connect the CableconnectingtheMainPCBtothescale’spowersystem.

(See Figure 3-2.)

7. Insert and tighten the screws that secure the PCB to the bottom housing.

Figure 3-3. Main Printed Circuit Board.

CHAPTER 3 MAINTENANCE PROCEDURES

Ohaus Corporation www.ohaus.com 3-4 Valor™ 7000 Series Service Manual

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 sold separately. (See Chapter 5.)

1. Unplug the cable leads connecting the Load Cell to the PCB. (See Figure 3-2.)

2. Turn the scale over and remove the bolts and washers that hold the Load Cell
assembly (frame and load cell) to the Bottom Housing.

Remove the bolts and their washer
pairs that hold the Load Cell
Frame to the Load Cell. Use a
high-leverage Allen wrench.

3. Lift the Load Cell away from
the frame.

Figure 3-4. Remove the bolts holding Frame to the
Load Cell.

4. When installing the replacement Load Cell, first secure the bottom frame to the load
cell with the screws and then secure the top frame to the load cell. Adjust the
down/up stop gaps (see table 3-2). Install the load cell assembly to the bottom
housing. Insert the bolts and their washers, and tighten the bolts. (See Table 3-1 for
torque settings.)

5. Connect the Load Cell cables to the PCB. (See Figure 3-2.)

CHAPTER 3 MAINTENANCE PROCEDURES

Valor™ 7000 Series Service Manual 3-5 Ohaus Corporation www.ohaus.com

TABLE 3-1. MOUNTING BOLT TORQUE SETTINGS

MODEL

TORQUE SETTING

V71P1501T

6N to 8N

V71P3T

6N to 8N

V71P6T

6N to 8N

V71P15T

6N to 8N

V71P30T

6N to 8N

6. 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 is replaced. This
procedure requires test masses equal to the scale’scapacity.(See Table 3-2.)

There are four Overload Stop Bolts. (See Figure 3-5.)

Adjust the Overload Stops, per Table 3-2:

1. Adjust the Overload Stop Bolt so that
the gap between the Load Cell Frame
and the Overload Stop Nut is equal to
the specification in Table 3-2. (The
gap can be tested by applying 100%
load, one corner at a time, at each
corner stop. If the gap is right, the Load
Cell Frame will just touch the Overload
Stop Nut.)

Note: Be careful not to overload the
Load Cell, which would damage it.

2. Repeat this for all four corners.

3. Test the scale to see if full capacity

can be achieved.

Figure 3-5. Overload Stops.

Overload
Stops

CHAPTER 3 MAINTENANCE PROCEDURES

Ohaus Corporation www.ohaus.com 3-6 Valor™ 7000 Series Service Manual

TABLE 3-2. VALOR 7000 OVERLOAD STOP GAP SETTINGS

Model

Max. Capacity

Overload Stop Gap

V7000 Scale

Load Cell

A/B mm

C/D mm

V71P1501T

1.5kg

3kg

0.6

0.5

V71P3T

3kg

5kg

0.8

0.7

V71P6T

6kg

10kg

1.5

1.1

V71P15T

15kg

20kg

2.4

1.7

V71P30T

30kg

40kg

2.4

1.7

Figure 3-6. Gap position of corners A, B, C, D. (A & B represent the front of the scale.)

A B D

C

Load Cell

CHAPTER 3 MAINTENANCE PROCEDURES

Valor™ 7000 Series Service Manual 3-7 Ohaus Corporation www.ohaus.com

3.7 Removing/Replacing the Rechargeable Battery

The Valor 7000 has a rechargeable battery.
If it fails to recharge, replace it as follows:

1. Liftthebattery’sfrontendenoughto
access the quick-connect tabs holding
the wire leads.

Note: Be careful not to short-circuit the
battery leads.

2. Pull the quick-connect tabs free of

the battery posts, and lift out the
battery.

Figure 3-7. Rechargeable battery.

3. Position the replacement battery in the compartment on an angle sufficient to access
the battery posts.

4. Insert the quick-connect tabs on their respective posts, and place the battery fully in
the battery compartment.

3.8 Replacing the Function Label

The Function Label may need to be replaced. (See Chapter 5 for parts information.)
Use a broad knife to remove the label. Clean the glue residue from the Housing surface.
Then carefully place the new label where the old one was.

CHAPTER 4 TESTING

Valor™ 7000 Series Service Manual 4-1 Ohaus Corporation www.ohaus.com

4.1 TESTING

Before and after servicing a Valor 7000 scale, an operational test and various performance tests
should be made to confirm that the scale meets specifications. Turn the scale on and allow it to
warm up for at least one hour before performing these tests.

NOTE:

Make sure the test area is free from drafts and that the scale rests on a level and
vibration-free surface.

4.1.1 TEST MASSES REQUIRED

The masses required to test the Ohaus Valor 7000 scales must meet the requirements of ASTM
Class 4 or OIML F2 Tolerance. The mass values are listed in Table 4-1.

TABLE 4-1. TEST MASS VALUES

Model

Weight (g)

V71P1502T

1kg,500g,200g

V71P3T

1kg,500g

V71P6T

2kg,1kg,500g

V71P15T

10kg,5kg,2kg

V71P30T

10kg,5kg

4.2 Operational Test

1. Connect a functioning Power cord to the back of the scale.

2. Plug the Power Cord into a suitable power source, or power the scale on using
battery power. (Assure that the battery is charged beforehand.)

4.3 Segment Display Test

Turn the scale on, and ensure that all segments are enabled and displayed briefly and
followed by a software revision number.

CHAPTER 4 TESTING

Ohaus Corporation www.ohaus.com 4-2 Valor™ 7000 Series Service Manual

4.4 Performance Tests

Accurate performance of the Valor 7000 scale is determined by a series of four performance
tests. The displayed readings are compared with the tolerances listed for each test in Table
1-2. Tolerance values are expressed in counts. A one-count difference is shown in the last digit
on the scale display.

NOTE:

The following performance tests are used to evaluate scale operation before and
after repairs. The scale must meet the requirements specified in each test as well
as the other specifications listed in Table 1-1. Before proceeding with the
following tests, the scale should be calibrated. (See Appendix A and B.)

4.4.1 Precision Test

The Precision Test measures the Standard Deviation of a set of similar weight readings, which
should match the specification for each model, listed in Table 1-1.

1. Power on the balance. The reading on the display should be 0g.

2. Select a mass weighing near the maximum capacity of the balance, and place it on
the center of the Pan. Observe and record the reading.

3. Remove the mass. The reading should return to 0g ±2 count.

4. Repeat this test three times. The reading should be within ±2 count of the reading
recorded. If so, the balance passes the Precision Test.

5. If the deviation for any set of readings (using the same mass placed on the center of
the Pan) is greater than ±2 d, the balance does not meet the precision specification.
Inspect and correct the following areas:

– Check for mechanical obstructions. Any foreign object touching any part of the

moving assemblies will cause a balance to fail the Precision Test. Inspect and
correct as necessary.

– If the scale does not meet specifications, move it to a suitable location, ensure

that it is level, and try again. If it still does not meet specifications, perform a
service calibration, and try again. (See Appendix B for Service Calibration.)

CHAPTER 4 TESTING

Valor™ 7000 Series Service Manual 4-3 Ohaus Corporation www.ohaus.com

4.4.2 Repeatability Test

Repeatability is the Standard Deviation of a set of similar weight readings.

Requirements:

– To perform this test a single mass must be used for all readings.

– The test mass should be approximately ½ of the capacity of the instrument.

– Wear gloves when handling the mass.

Before starting a repeatability test, set up the instrument as follows:

Set Up:

Follow the steps in Appendix A, Section A-2, Setup and Calibration.

Record Settings:

Zero Tracking Setting = ____________

Displayed Units = ____________

Mass Used = ____________

TEST PROCEDURE:

1. Zero the instrument, if it does not read zero.

2. Using a test mass approximately half the capacity of the instrument, place the mass on
the center of platform. Record the reading on the worksheet provided.

3. Remove the mass from the platform.

4. Repeat this test starting at Step 1 until you record a total of ten readings

Fill in the worksheet (Table 4-2) with the ten (10) readings.

CHAPTER 4 TESTING

Ohaus Corporation www.ohaus.com 4-4 Valor™ 7000 Series Service Manual

TABLE 4-2. REPEATABILITY WORKSHEET

n

Reading

Delta = Reading – Mean

Delta x Delta

1

2

3

4

5

6

7

8

9

10

n = number of Reading Mean = Sum of readings / 10 Delta = Reading – Mean

Standard Deviation = Square Root of (sum of (Delta x Delta) / 9)

5. Add the ten readings and divide the total by 10 to find the Mean (average).

6. Mean = (Reading 1 + Reading 2 + Reading 3 + Reading 4 + Reading 5

7. + Reading 6 + Reading 7+ Reading 8 + Reading 9 + Reading 10) / 10

Mean =________

6. Calculate the Delta for each reading and record in the work sheet.

Delta = Reading – Mean

7. Calculate the Delta x Delta for each reading and record in worksheet.

8. Add the ten Delta x Delta values and divide by 9

9. Calculate the Standard Deviation by applying the square root of the result from step 8.

Standard Deviation =___________

Note: If the balance does not meet specifications, move it to a suitable location, ensure

that it is level, and try again.

CHAPTER 4 TESTING

Valor™ 7000 Series Service Manual 4-5 Ohaus Corporation www.ohaus.com

4.4.3 Linearity Test

This test is used to determine the linearity of the unit throughout its operating range.
The masses used to perform this test can be utility masses

NOTE:

The scale must pass the Precision and Repeatability Tests, and be calibrated before
the Linearity Test may be performed.

TABLE 4-3. LINEARITY TEST MASSES

Capacity (g)

1500 x 0.05 g

3000 x 0.1g

6000 x 0.2g

15000 x 0.5g

30000 x 1g

Reference Wt.

500g

500g

1kg

2kg

5kg

Load 1

200g

1000g

2kg

5kg

10kg

Load 2

500g

1000g

1kg

5kg

10kg

Load 3

200g

500g

2kg

2kg

5kg

NOTE:

All masses are nominal values. Use the same reference mass throughout the procedure.

1. Place the test mass on the Scale, record the weight and remove.

2. Place Load 1 on the Scale and press ON/ Zero - Off.

3. Place the test mass on the Scale, record the weight and remove.

4. Place Load 2 on the Scale and press ON/ Zero - Off.

5. Place the test mass on the Scale, record the weight and remove.

6. Place Load 3 on the Scale and press ON/ Zero - Off.

7. Place the test mass on the Scale and record the weight.

8. The difference in the weights of the test mass should be within ±2 d, as specified in

the Tables 1-1 and 1-2. If not, calibrate (see Appendix A.1) and repeat the test.

9. If the Scale remains out of tolerance, the Load Cell may need to be replaced.

4.4.4 Off-Center Load Test

The Off-Center Load Test is used to determine whether displayed weight values are affected by
moving the sample to different areas of the Pan.

1. Place half of the scale’s capacity in the center of the Pan.

2. Note the reading.

3. Move the mass halfway (between the center and the edge) to the front of the Pan.

Note any differences in the displayed weight reading.

4. Repeat the test for the back, left, and right position of the Pan.

CHAPTER 4 TESTING

Ohaus Corporation www.ohaus.com 4-6 Valor™ 7000 Series Service Manual

5. Maximum allowable change in displayed weight readings for each of the four

positions can be found in Tables 1-1 (Specifications, page 1-2).
If this maximum is exceeded, follow procedures in Section 4.4.5, Adjusting Off
Center Load.

4.4.5 Adjusting Off Center Load

If the Off Center Load (OCL) is excessive, perform adjustment as follows:

A

B

C

D

WeighingPan’scenter,

with points A – D indicated

2

3

1

4

Top view of Load Cell

Side view of Load Cell

Pan

Fixed end

2

1

4

3

Figure 4-1. Scale drawing of Valor 7000 Load Cell and Weighing Pan.

1. Place the test weight in the center of the Weighing Pan.

2. Tare the balance.

3. Move the weight to point A and record the reading.

4. Move the weight to point B and record the reading.

5. Move the weight to point C and record the reading.

6. Move the weight to point D and record the reading.

7. If the reading at point A is negative, file at points 1 and 4 AT AN ANGLE.

8. If the reading at point B is negative, file at points 1 and 2 STRAIGHT ACROSS.

9. If the reading at point C is negative, file at points 2 and 3 AT AN ANGLE.

10. If the reading at point D is negative, file at points 3 and 4 STRAIGHT ACROSS.

Note: It is not recommended that you try to adjust more than –5 counts if the beam has
been filed already. If the beam has not been filed previously, you can adjust –10 counts.
Remember, when filing you are weakening the beam. File a little at a time.

CHAPTER 5 PARTS LISTS & DIAGRAMS

Valor™ 7000 Series Service Manual 5-1 Ohaus Corporation www.ohaus.com

This section of the manual contains exploded views of the Valor 7000 scale. The exploded view
drawings are designed to identify the parts which can be serviced on the scale in the field.

NOTE:

In all cases where a part is replaced, the scale must be thoroughly checked after
the replacement is made. The scale MUST meet the parameters of all applicable
specifications in this manual.

If further technical information is needed, please contact your local Ohaus distributor, or:

www.ohaus.com

Ohaus Corporation,
7 Campus Drive
Suite 310
Parsippany, NJ 07054 USA

Tel: [phone]
Fax: [phone]

In the United States call toll free, 800-526-0659 between 8:00 a.m. and 6:00 p.m. EST.

CHAPTER 5 PARTS LISTS & DIAGRAMS

Ohaus Corporation www.ohaus.com 5-2 Valor™ 7000 Series Service Manual

5.1 Valor 7000 SCALES: PARTS

Figure 5-1. Valor 7000 Scales: Parts.

CHAPTER 5 PARTS LISTS & DIAGRAMS

Valor™ 7000 Series Service Manual 5-3 Ohaus Corporation www.ohaus.com

TABLE 5-1. Valor 7000 SCALES: PARTS

Drawing Item

Part Number

Description

1

30037417

Pan,Plastic,R31,RC31,V71

2

30037395

Housing,Top,V71

3

30025998

Function Label,Rear,EN,V71

30060923

Function Label,Rear,JP,V71

30037467

Function Label,Rear,KR,V71

4

30025997

Function Label, Front,EN,V71

30060922

Function Label, Front,JP,V71

30037466

Function Label, Front,KR,V71

5

30037434

Spider,Upper, R31,R21,RC31,RC21,V71

6

30037401

LoadCell AMI C3 3kg,V71P1502T

30037402

LoadCell AMI C3 5kg ,V71P3T

30037403

LoadCell AMI C3 11kg ,V71P6T

30037404

LoadCell AMI C3 22kg ,V71P15T

30037405

LoadCell AMI C3 40kg,V71P30T

7

30037435

Spider,Down, R31,R21,RC31,RC21,V71

8

30037420

Hardware Kit,R31,R21,RC31,RC21,V71

9

30037400

Housing,Bottom,V71

10

30037421

Feet,R31,R21,RC31,RC21,V71

11

30037422

Cover,Option, R31,R21,RC31,RC21,V71

12

30037392

Switch Power, R31,RC31,V71

13

30037428

PCBA,Main,R31,RC31,V71

14

71168359

Battery,Lead Acid,R31,R21,RC31,RC21,V71

15

30037419

Harness,R31,R21,RC31,RC21,V71

16

30037438

PCBA,IR sensor with a IR cover,V71P

17

30037430

PCBA,Display,LCD,R31,R21,V71

18

30037433

PCBA,Display,LCD,rear,V71

NA

30037383

Packaging Box carton,R31,R21,RC31,RC21,V71

NA

30037384

Packaging Box,complete,R31,R21,RC31,RC21,V71

NA

30037457

Manual, Instr.,JP,V71

NA

30060919

Manual, Instr.,KR,V71

NA

72200232

Line Cord , US

NA

72200229

Line Cord, EU

NA

72200228

Line Cord, AU

NA

72200231

Line Cord, GB

NA

72200230

Line Cord, JP

NA

30031898

Manual,CD, EN ES FR DE IT, V71

Note: For parts numbers, see your local Ohaus distributor, or visit www.ohaus.com.

APPENDIX A STANDARD CALIBRATION

Valor™ 7000 Series Service Manual A-1 Ohaus Corporation www.ohaus.com

APPENDIX A. STANDARD CALIBRATION & SETUP

A.1 CALIBRATION

Standard calibration should be performed prior to using a scale, and after service.

NOTE:

Be careful not to touch the scale or the table while calibration is in progress,
as it will cause the process to fail.

Preliminary Steps:

1. Be sure the scale is level and stable during the entire calibration process.

2. Allow the scale to warm up for approximately five minutes after stabilizing to room
temperature.

3. To abort calibration, press Exit key or turn the scale off anytime during the calibration
process.

4. Before performing the calibration, be sure to have the appropriate calibration weights as
listed in table A-1.

5. Ensure that the LFT switch/calibration lock is set to unlocked position.

6. Or adjust the GEO setting according to your location (see instruction manual).

Table A-1.

Suggested Span Calibration Mass (sold separately)

Max

Mass1

Max

Mass

1

1500g

1.5kg / 3lb

15000g

15kg / 30lb

3000g

3kg / 6lb

30000g

30kg / 60lb

6000g

6kg / 15lb

APPENDIX A STANDARD CALIBRATION

Ohaus Corporation www.ohaus.com A-2 Valor™ 7000 Series Service Manual

A.2 SETUP AND CALIBRATION

Note: Be sure units are set to kg before starting calibration.

1. Turn on the scale. Press and hold Menu until [mMeNU] (Menu) is
displayed. When the button is released, the display will show [C.A.L].

mMeNU

C.A.L

2. Press Yes to accept. [SpaN] will then be shown. Press Yes to begin the
span calibration. [ 0 kg] will be displayed.

SpaN

0

3. Press Yes to accept. [--C--] will be displayed while zero reading is
stored. Next, the display shows the calibration weight value (e.g. 3).

--C—

3

4. Place the specified calibration mass on the pan. Press Yes to accept
the weight or No to select an alternate weight. [--C--] will be
displayed while the reading is stored.

--C--

5. The display will show [done] if the calibration was successful. The scale
returns to the previous application mode and is ready for use.

done

APPENDIX B SERVICE CALIBRATION

Valor™ 7000 Series Service Manual B-1 Ohaus Corporation www.ohaus.com

APPENDIX B. SERVICE CALIBRATION

This section describes the Service Menu and sub-menus, which allow authorized service
personnel to perform factory Linearity and Span calibrations (no pre-set limits).

Note:

Be careful not to touch the scale or the surface it rests on while calibration is in
progress, as it will cause the process to fail.

B.1 Service Menu Structure

B.2 Entering the Service Menu

Turn the scale off.

Press the On/Zero then hold the Function and M+ keys
simultaneously for 6 seconds until S.E.r.V.C.e is displayed.

S.E.r.V.C.e

Service

Cap

Span

Lin

Ramp

Expand

End

Grad

APPENDIX B SERVICE CALIBRATION

Ohaus Corporation www.ohaus.com B-2 Valor™ 7000 Series Service Manual

B.3 Capacity Menu

When CAP appears, press YES to accept the Capacity menu item,
or press NO to advance to the menu item.

CAP

The current Capacity Setting is displayed, blinking.
(Outlined characters represent a flashing display.)

Note: The default setting is 3

Press YES to accept the setting and move to the Service Grad menu
item.

Press NO to enter another value using the numeric keypad and then
press YES to store the new value.

B.4 Graduation Menu

When GrAd appears, press YES to accept the Graduation menu or No

to advance to the Service Span Calibration menu.

Set the graduation of the scale.

0.00005,…,0.02

Grad

B.5 Service Span Calibration

When SPAN appears, press YES to accept the Service Span
Calibration menu or No to advance to the Service Linearity

Calibration menu.

0 flashes. With no weight on the pan, press Yes to establish the
zero point. (Outlined characters represent a flashing display.)

- - C - - flashes while the zero point is established.

Service Span Calibration point flashes.
(The example shows the value for a Scale Capacity of 3 kg.)
Place the specified calibration weight on the pan and press Yes.

- - C - - flashes while the span point is established.

If span calibration was successful, the actual weight reading
appears for three seconds, followed by the Service Linearity
Calibration menu item.
(The example shows a 3 kg span weight on the pan.)

SPAN

--C--—

--C--—

3.000

APPENDIX B SERVICE CALIBRATION

Valor™ 7000 Series Service Manual B-3 Ohaus Corporation www.ohaus.com

B.6 Service Linearity Calibration

This calibration method uses three points. The full-calibration point is established with a weight
on the scale. The mid-calibration point is established with a weight equal to half of the full
calibration weight on the scale. The zero calibration point is established with no weight on the
scale. The mid-calibration points cannot be altered by the user during the calibration procedure.

When LIN appears, press YES to accept the Service Linearity Calibration
menu, or No to advance to the Ramp menu item.

LIN

0 flashes. The kg LED is lit to indicate the calibration unit.
With no weight on the pan, press Yes to establish the zero point.
(Outlined characters represent a flashing display.)

- - C - - flashes while the zero point is established.

--C--

The mid calibration point value flashes. The kg LED is lit to indicate the
calibration unit. (The example shows the mid calibration point value for a
Scale Capacity of 3 kg.)
Place the specified calibration weight on the pan and press Yes.

- - C - - flashes while the mid point is established.

--C--

The full calibration point value flashes. The kg LED is lit to indicate the
calibration unit. (The example shows the full calibration point value for a
Scale Capacity of 3 kg.)
Place the specified calibration weight on the pan and press Yes.

- - C - - flashes while the full point is established.

--C--

If linearity calibration was successful, the scale will exit the service menu
and enter weighing mode.
(The example shows a 3 kg span weight on the pan.)

3.000

If linearity calibration was successful, S.End appears.
Press YES to exit the Service menu and return to the weighing mode,
or NO to return to the first Service menu item.

End

NOTE: If calibration fails, ensure that the test area is free from drafts and the surface the scale
rests on is level and free of vibrations. Then try to calibrate again. If it continues to fail, there
may be an internal problem. To resolve internal problems, follow procedures in Chapter 3.

APPENDIX B SERVICE CALIBRATION

Ohaus Corporation www.ohaus.com B-4 Valor™ 7000 Series Service Manual

B.7 Ramp Menu
When ramMp appears, press YES to accept the Ramp menu, or No

to advance to the Expand menu item.

The Ramp value is displayed as a percent of the A/D range.
Press YES to advance to the Expand menu item.

Note: Ramp is used to troubleshoot load cell problems. 0%
represents no signal from the A/D, 100% reflects the upper signal
range of the A/D.

ramMp

0.0

to

100.0

B.8 Expand Menu
When e.paNd appears, press YES to accept the Expand menu, or

No to advance to the End menu item.

OFF = disabled

ON = enabled

Note: Expand is required for various performance tests.

e.paNd

B.9 End Menu

When e.N.D appears, press YES to return to exit the service menu,
or No to advance to the CAP menu.

e.N.D