Penn Scale R71MD15 Service Manual

Ranger 7000® Scale

Service Manual

TABLE OF CONTENTS

Page No.

1 GETTING STARTED 4

1.1 INTRODUCTION 4

1.2 SERVICE FACILITIES 4

1.3 TOOLS AND TEST EQUIPMENT REQUIRED 5

1.4 SPECIFICATIONS 5

1.5 OPERATION 8

1.5.1 Overview of the Controls 8

1.5.2 Principle Functions and Main Menu. 10

2 DIAGNOSTIC GUIDE 11

2.1 TROUBLESHOOTING 11

2.2 SOFTWARE 11

2.3 DIAGNOSTIC GUIDE 12

3 MAINTENANCE / REPAIR PROCEDURES 14

3.1 PREVENTIVE MAINTENANCE 14

3.2 OPENING THE SCALE 15

3.2.1 Preparation for Opening Ranger 7000® Models 15

3.3 OPENING THE TERMINAL MODULE 15

3.3.1 Detaching the Terminal from the base. 15

3.3.2 Detaching the base RS422 cable from the Terminal 16

3.3.3 Dismantling the Terminal housing 18

3.4 OPENING THE BASE MODULE 22

3.4.1 Opening R71 large housing model 22

3.4.2 Opening R71 small housing mode 25

3.5 Replacing MFR Load cell, R71 29

3.6 Replacing SG Load cell, R71 32

3.7 REPLACING THE PRINTED CIRCUIT BOARD ASSEMBLIES (PCBA) 34

3.7.1 Terminal 34

3.7.2 Remove the TFT PCB 36

3.7.3 Removing MFR Main PCBA 39

3.7.4 Removing MFR LFT PCBA 41

3.7.5 Replacing SG LFT PCBA 43

3.7.6 Replacing SG Main PCBA 45

4 TESTING 48

4.1 TEST MASSES REQUIRED 48

4.1.1 OPERATIONAL TEST 49

4.2 LOAD CELL TEST USING RAMP 49

4.3 PERFORMANCE TESTS 49

4.3.1 Precision Test 49

4.3.2 Repeatability Test (non-approved models) 50

4.3.3 Linearity Test 52

4.3.4 Off-Center Load Test 53

5 PARTS LISTS & DIAGRAMS 55

5.1 TERMINAL SPARE PARTS 56

5.2 BASE SPARE PARTS (R71MD3 and R71MD6) 58

5.3 BASE SPARE PARTS (R71MD15 and R71MD35) 60

5.4 BASE SPARE PARTS (R71MHD3 and R71MHD6) 62

5.5 BASE SPARE PARTS (R71MHD15 and R71MHD35) 64

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TABLE OF CONTENTS

Page No.

6 ACCESSING THE SERVICE MENU. 66

6.1 Accessing the Service Menu (Super Password) 66

6.2 Creating UserLogin 67

6.3 Under Service Menu 70

6.4 Maintenance (Diagnostic) 73

6.5 Disable 'Service Menu'. 76

APPENDIX A – COMMUNICATION 78

A.1 Scale Commands. 78
A.2 RS232 (DB9) Pin Connections 79

A.3 USB HOST 79
A.3.1 Print Format 79
A3.2 Print Out String for g, kg,lb, oz Units 79
A3.3. Print Out String for lb:oz Units 80
APPEDDIX B-
B.1 Software Installation & Software Selection 81
B.2 Product Selection 82
B.3 To Restore the EEPROM Data 82
B.4 Com Port Configuration 84
B.5 To Replace Load Cell 85
B.6 Install New Main Printed Circuit Board (PCBA) 87
B.7 Update the Software in the Scale 89
B.8 Diagnostic 90

LIST OF TABLES

TABLE NO. TITLE Page No.

1-1 Specifications 6-7
1-2 Menu and Screen Navigation 10
2-1 Diagnostic Guide 16
4-1 Calibration Mass Values 51
4-2 Repeatability Worksheet 54
4-3 Linearity Test – Reference and Load Masse 55
4-4 Off Center Load Mass Values 56
5-1 Terminal Spare Parts 59
5-2 Base Spare Parts (R71MD3 and R71MD6) 61
5-3 Base Spare Parts (R71MD15 and R71MD35) 63
5-4 Base Spare Parts (R71MHD3 and R71MHD6) 65
5-5 Base Spare Parts (R71MHD15 and R71MHD35) 67
A-1 Interface Command List 80

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TABLE OF CONTENTS

Ohaus Corporation www.ohaus.com iii Ranger 7000® Service Manual

1 GETTING STARTED

1.1

INTRODUCTION

This service manual contains the information needed to perform routine maintenance and service
on the Ohaus Ranger 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, 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 Ranger 7000® scales

identifying all serviceable components.

Chapter 6 – Entering to Service Menu- Explains method to enter to Service Menu.
Appendix A - Communication – Explains the scale communication information.

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.

•

Handle all electronic assemblies with appropriate Electro-Static protection.

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1.3

TOOLS AND TEST EQUIPMENT REQUIRED

•

Common hand tools are sufficient to disassemble the Ranger 7000® scales.

•

A PC running Microsoft Windows XP or later.

•

Ranger 7000® Software Service Tool, PN 83032124

•

RS232 Cable – Scale to PC PN 80500525

•

Digital voltmeter (DVM) with an input impedance of at least 10 meg-ohms at 1 volt DC.

•

Masses as shown in Table 4-1.

1.4

SPECIFICATIONS

Specifications for the Ohaus Ranger 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.

Special Note regarding Approved scales:

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.

Ambient conditions

Indoor use only 
Altitude: Up to 2000 m 
Specified Temperature range: 10 °C to 30 °C (R71MH D3/6/15/35 models) 

-10 °C to 40 °C (R71MD3/6/15/35 models)

Humidity: maximum relative humidity 80 % for temperatures up to 30 °C 

decreasing linearly to 50 % relative humidity at 40 °C

Mains supply voltage fluctuations: up to ±10 % of the nominal voltage 
Installation category II 
P ollution degree: 2
Operability is assured at ambient temperatures between 5 °C to 40 °C. 

Materials

Base Housing; die -cast Aluminum, Painted
Terminal housing: die -cast Aluminum, Painted
Weighing Pan: 304 Stainless Steel 

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TABLE 1-1 SPECIFICATIONS

MODEL R71MHD3 R71MHD6 R71MHD15 R71MHD35

Capacity 3000 g 6000 g 15000 g 35000 g
Readability d 0.01 g 0.02 g 0.1 g 0.1 g
Approved

Readability e
Repeatability

(std. dev.)
Linearity ± 0.02 g ± 0.04 g ± 0.2 g ± 0.2 g

Span Calibration
Points

Weighing units gram, kilogram, ounce, pound, pound:ounce, ton

0.1 g 0.2 g 1 g 1 g

0.01 g 0.02 g 0.1 g 0.1 g

500 g, 1500 g,
2000 g, 3000 g

1000 g, 2000
g, 4000 g,
6000 g

5000 g, 10000
g, 15000 g

10000 g, 20000
g, 30000 g,
35000 g,

Applications
Stabilization time

(typical)
Display TFT Graphic LCD

Display size 4.3 in
Backlight White LED
Communication RS-422, USB

Power supply Power Input: 100-240 V~ 0.5 A 50/60 Hz

Platform size
Terminal

Housing
dimensions

(W x D x H) 10.5 x 4.6 x 2.8 in
Base Housing

dimensions
(W x D x H) 11 x 11 x 4.5 inch 14.9 x 12.2 x 5 inch
Assembled

dimensions
(W x D x H) 11 x 11 x 4.5 inch 14.9 x 18.4 x 5 inch

Net weight 7.2 kg / 16 lb 10.9 kg / 24 lb
Shipping weight 9.2 kg / 20.3 lb

Weighing, Parts Counting, Percent Weighing, Check Weighing,
Dynamic Weighing, Filling, Formulation, Differential Weighing, Density

Within 1 second

240 x 240 mm 377 x 311 mm

9.4 x 9.4 inch 14.8 x 12.2 inch

267 x 118 x 72 mm

280 x 280 x 114 mm 377 x 311 x 128 mm

280 x 420 x 114 mm 377 x 467 x 128 mm

14.4 kg / 31.7
lb

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MODEL R71MD3 R71MD6 R71MD15 R71MD35

Capacity 3000 g 6000 g 15000 g 35000 g
Readability d 0.05 g 0.1 g 0.2 g 0.5 g

Approved
Readability e

Repeatability
(std. dev.)

Linearity ± 0.1 g ± 0.2 g ± 0.4 g ± 1 g
Span Calibration

Points
Weighing units gram, kilogram, ounce, pound, pound:ounce, ton

0.5 g 1 g 2 g 5 g

0.05 g 0.1 g 0.2 g 0.5 g

500 g, 1500 g,
2000 g, 3000 g

1000 g, 2000
g, 4000 g,
6000 g

5000 g,10000
g, 15000 g

10000 g, 20000
g, 30000 g,
35000 g

Applications
Stabilization time

(typical)
Display TFT Graphic LCD

Display size 4.3 in
Backlight White LED
Communication RS-232, USB

Power supply Power Input: 100-240 V~ 0.5 A 50/60 Hz

Platform size
Terminal

Housing
dimensions

(W x D x H) 10.5 x 4.6 x 2.8 in
Base Housing

dimensions
(W x D x H) 9.4 x 9.4 x 4.5 inch 14.9 x 12.2 x 5 inch
Assembled

dimensions
(W x D x H) 17.4 x 16.5 x 4.5 inch 14.9 x 18.4 x 5 inch

Net weight 6.8 kg / 15 lb 9.9 kg / 21.8 lb
Shipping weight 8.5 kg / 18.7 lb

Weighing, Parts Counting, Percent Weighing, Check Weighing, Dynamic
Weighing, Filling, Formulation, Differential Weighing, Density

Within 1 second

280 x 280 mm 377 x 311 mm

11 x 11 inch 14.8 x 12.2 inch

267 x 118 x 72 mm

280 x 280 x114 mm 377 x 311 x 128 mm

240 x 420 x 114 mm 377 x 467 x 128 mm

13.4 kg / 29.5
lb

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1.5

OPERATION

1.5.1 Overview of the Controls

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Ranger 7000® Series Service Manual

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1.5.2 Principle Functions and Main Menu.

1-2 Menu and Screen Navigation

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2 DIAGNOSTIC GUIDE

This section of the manual contains troubleshooting information. Information is contained to isolate
specific problems using Table 2-1, 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
protection devices to prevent damage to the sensitive electronic components.

2.1

TROUBLESHOOTING

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 scale 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 equipment to warm up for 60 minutes on precision models for optimal weighing

performance. Allow 4 hours for analytical models to stabilize.

2.2

SOFTWARE

In most cases understanding the customer’s problem with the scale is easy. Physical damage,
displayed error code, failure to power up and obvious poor performance can usually be repaired by
following the instructions in the following sections.

Some scale issues may be software related. New releases of the software may correct these
issues. The Ranger 7000® Scale has upgradeable software in the Terminal and the Base modules.
The software revision in the scale can be seen when the scale is in standby mode or during the
power up sequence. The software version is displayed in the lower right hand corner of the screen.
The screen will show:

Model number for example: Ranger 7000® R71MD3
Capacity and readability 3000g x 0.05g
Software Revision “Terminal” / “Base” Version 1.00 / 0.14

The scale software can also be retrieved by sending a “PV” command via the RS232 or other
interface.

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Power On Zero limit.

printing

2.3

DIAGNOSTIC GUIDE

2.1 Diagnostic Guide

Error Code Description Cause
EEP Error EEPROM Checksum

Error

Power on Overload Power On Error Weight reading exceeds
Power on Underload Power On Error Weight reading below
Overload Over Range Error Weight reading exceeds
Underload Under Range Error Weight reading below
Tare Error Tare out of range Error Tared at one unit but

Display Overflow Display Overflow Weight exceeds 6
No Calibration Calibration data error Calibration data does

------- Busy message Displayed during tare

Corrupted EEPROM
data

Power On Zero limit.
Overload limit.
Underload limit.
after switching to

another unit the tare
value exceeds the
maximum.

digits.
not exist.
setting, zero setting,

--NO-- Action not allowed
message

Calibration Error Calibration Error Calibration value
Low Reference Low reference weight

warning message

Reference Error Unacceptable reference

weight message

Function not executed.

outside allowable limits
Average Piece Weight
too small. (Warning)
Reference Weight too
small. The weight on
the pan is too small to
define a valid reference
weight.

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Diagnosis:

1. Isolate and identify the symptom.

2. Refer to Troubleshooting 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.

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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 an
additional 60 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.

3. Check the Power Cord for broken or damaged insulation.

4. Make a visual inspection for faulty connectors, wiring, and loose hardware.

CAUTION

DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE.
SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE’S FINISH.

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3.2

OPENING THE SCALE

Opening the Ranger 7000® scale varies slightly according to the specific model, as detailed below.
Use these procedures in order to replace the Load Cell, the Printed Circuit Board or other
components.

Common hand tools are sufficient to disassemble the Ranger 7000® scale s.

3.2.1 Preparation for Opening Ranger 7000® Models

1. Turn the scale off and unplug the power cord before you begin.

2. Disconnect any communication or other option cables.

3.3

OPENING THE TERMINAL MODULE

*Below show a Ranger7000 MFR small housing model R71MHD6.

3.3.1 Detaching the Terminal from the base.

1. Switch off and disconnect the scale from main power supply.

2. Detach the display terminal from the base by pressing both release buttons at the same time
as show below picture. After that pull the Terminal towards you (outward) until the Terminal is
detached from the base as show below.

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3.3.2 Detaching the base RS422 cable from the Terminal.

1. Dismantle the base RS422 cable from the Terminal.

2. Removing the docking bracket from the Terminal.

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3. Flip the Terminal around locate the 3 screws as shown and remove the screws which are
mounting the bracket to the Terminal as shown below and separate the docking bracket from
the Terminal.

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3.3.3 Dismantling the Terminal housing.

1. Remove the 5 screws securing the housing.

•

4 screws are located underneath the rubber cover at 4 corners of the bottom housing.

Remove the rubber cover and you will be able to locate and remove the 4 hidden screws.

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2. After removing the screws which are securing the bottom housing with the top housing turn the
terminal module over. After that carefully lift up the top housing, DO NOT remove the top
housing completely away from the bottom housing because the Terminal keypad overlay
ribbon cable and TFT display ribbon cable are still attached with the Terminal main PCBA.

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3. Disconnect the ribbon cable connecting the TFT with Terminal PCBA by using a thin screw
driver blade radiated the back cable-lock on the connector 90⁰ so that it is perpendicular to the
cable as show in below pictures.

Connector lock with ribbon cable attaches Connector open with TFT ribbon cable remove.

4. Disconnect the keypad overlay ribbon cable from the Terminal PCBA by unfasten the
connector as shown in below pictures.

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Shift the connector outward Connector open and keypad overlay cable remove

5. Both bottom and top Terminal housing are now separated.

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3.4 Opening the Base Module

3.4.1 Opening R71 large housing model (R71MD15, R71MD35, R71MHD15,R71MHD35)

(A R71MD15 is used in below).

1. Prepare the bases as mention above.

2. Remove the weighing Pan from the base.

Complete set of Large Housing base Weighing pan removed

3. Remove the 2 screws securing the Spider to the top housing.

Location of 2 screws securing the Spider with base top housing.

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Spider removed from base top housing.

4. Remove 6 screws securing the base top housing and bottom housing.

Location of the first 6 screws.

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5. The 7th screw is underneath the LFT cover.

Remove the 2 screws securing the LFT cover.

7th screw expose, by removing this screw you will be able to dismantle the base top housing from the
base bottom housing.

R71 SG Base top housing removed.

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3.4.2 Opening R71 small housing model (R71MHD6 is used in below).

6. Prepare the bases as mention above.

7. Remove the weighing Pan and Wind Ring from the base.

Complete set of MFR base Weighing pan removed

Wind Ring removed.

8. Remove the 2 screws securing the Spider to the top housing.

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Location of 2 screws securing the Spider with base top housing.

Spider removed from base top housing.

9. Remove 5 screws securing the base top housing and bottom housing.

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10. The 5th screw is underneath the LFT cover.

Remove the 2 screws securing the LFT cover.

5th screw expose, by removing this screw you will be able to dismantle the base top housing from the
base bottom housing.

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3.5 Replacing MFR Load cell, R71.

Model R71MHD6 is shown below.

1. Locate the 4 screws securing the MFR load cell with the base bottom housing.

R71 load cell type MFR.

3. Remove the cable connecting the Base PCBA with MFR load cell as shown below.

4. Remove the Red and White cable connecting the base PCBA with LFT PCBA.

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5. Remove the cable connected from the load cell Auto Calibration motor PCBA to the main PCBA

as shown below.

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6. After removing the 3 cables mention above the next step would be removing the 4 screws which

are securing the MFR load cell from the base bottom housing.

Once these 4 screws are removed you can securely remove the cell from the base.

Location of the screws securing the MFR cell from the base bottom housing.

Re-Assembly:

Reverse the disassembly procedure to assemble the scale. Ensure that there is no foreign material
between the Base mounting surfaces and the Load cell.

Take special care to route the wires and cables according to their original positions. Proper routing
is important for RFI/ESD performance. Ensure that the wires or cables are not pinched during re­assembly.

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3.6 Replacing SG Load cell, R71.

Model R71MD15 is shown below.

1. Locate the 2 screws securing the SG load cell with the base bottom housing.

R71 load cell type SG.

2. Remove the cable connecting the Base PCBA with SG load cell as shown below.

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3. By holding the load cell in one hand unscrew the 2 screws which securing the SG load cell

located at the bottom of the base housing.

Re-Assembly:

Reverse the disassembly procedure to assemble the scale. Ensure that there is no foreign material
between the Base mounting surfaces and the Load cell.

Take special care to route the wires and cables according to their original positions. Proper routing
is important for RFI/ESD performance. Ensure that the wires or cables are not pinched during re­assembly.

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3.7 REPLACING THE PRINTED CIRCUIT BOARD ASSEMBLIES (PCBA)

Before working with the exposed PCBAs appropriate ESD protection must be taken to prevent
damage to the sensitive electronic components. It is recommended that a conductive mat with wrist
straps be used when working with electronic components.

3.7.1 Terminal

A) Separate the Terminal PCBA from the bottom housing by removing 4 screws, one 8PIN

connector on top of the PCBA and another 2 screws securing the RS232 port to the bottom
housing. (Located at the back of the Terminal)

Location of the 4 screws and 8PIN connector on the Terminal PCBA.

B) Remove the 8PIN connector by gently pulling up the connector.

Showing 8PIN Connector attached and detached from Terminal PCBA.

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C) Removing the 2 screws securing the RS232 Port to the bottom housing.

R71 RS232 port located behind the Terminal.

2 screws securing the RS232 port against the Terminal housing removed.

(Remember to place back these 2 screws after repairing)

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Terminal PCBA taken out from Terminal bottom housing.

3.7.2 Remove the TFT PCB

A) Remove the two screws holding the TFT in place as shown below.

Location of the 2 screws holding the TFT in place against the Terminal Top housing. (Note the
position of the two RED holders)

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Correct RED holder position Wrong RED holder position

2 screws and Red Holder removed.

B) Gently remove the TFT from the top housing and place in a secure area.

*When re-installing the TFT PCB make sure the surface on the TFT PCB and Top housing is
clean and free from dust and debris.

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TFT PCB removed from Terminal Top housing.

R71, 4.3" TFT Display PCB P/N: 30095940

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3.7.3 Removing MFR Main PCBA, R71. (R71MHD3, R71MHD6, R71MHD15 & R71MHD35)

Below show model R71MHD6.

1) Remove 5 cables from the main PCBA.

2) Loosen the 2 screws securing the main PCBA with the base bottom housing.

1. Remove the below cables from the main PCBA.

Location of the 5 cables on the main PCBA.

A Cable, Red/Black Cable from main PCBA to LFT PCBA
B Cable, RS422 Cable from main PCBA to R71 Display Terminal.
C Cable, Cable from main PCBA to LFT PCBA.
D Cable, Cable from MFR cell to main PCBA.
E Cable, Cable from AutoCal motor PCBA to main PCBA.

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2. After removing the above 5 cables now locate and loosen 2 screws which securing the LFT

PCBA to the bottom housing.

Location of the 2 screws securing the main PCBA to the bottom housing.

Screw at Lock position Screw at Un-Lock position
Once you set the two screws in Un-Lock position you will be able to remove the Main PCBA from the

bottom housing.

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3.7.4 Removing MFR LFT PCBA, R71. (R71MHD3, R71MHD6, R71MHD15 & R71MHD35)

Model R71MHD6 is shown below.

1. Remove the 5 cables from the LFT PCBA.

2. Loosen the 2 screws securing the LFT PCBA with the base bottom housing.

1. Remove the below 5 cables from the LFT PCBA.

Location for the 5 cables.

A Cable, Cable link from LFT PCBA to optional rechargeable battery.
B Cable, Cable link from LFT PCBA to ON OFF Switch.
C Cable, Cable link from LFT PCBA to Main PCBA.
D Cable, Black/While cable link from LFT PCBA to AC Adapter.
E Cable, Red/White Cable from LFT PCBA to Main PCBA.

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2. After removing the above 5 cables now locate and loosen 2 screws which securing the LFT

PCBA to the bottom housing.

Picture shows 5 cables removed, location of the 2 screws.

Screw at Lock position Screw at Un-Lock position
Once you set the two screws in Un-Lock position you will be able to remove the LFT PCBA from the

bottom housing.

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3.7.5 Replacing SG LFT PCBA, R71. (R71MD3, R71MD6, R71MD15 & R71MD35)

Model R71MD6 is shown below.

1. Remove 5 cables from the LFT PCBA.

2. Loosen the 2 screws securing the LFT PCBA with the base bottom housing.

1. Remove the below 5 cables from the LFT PCBA.

Location for the 5 cables.

A Cable, Cable link from LFT PCBA to optional rechargeable battery.
B Cable, Cable link from LFT PCBA to ON OFF Switch.
C Cable, Cable link from LFT PCBA to Main PCBA.
D Cable, Black/While cable link from LFT PCBA to AC Adapter.
E Cable, Red/Black Cable from LFT PCBA to Main PCBA.

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2. After removing the above 5 cables now locate and loosen 2 screws which securing the LFT

PCBA to the bottom housing.

Picture shows 5 cables removed, location of the 2 screws.

Screw at Lock position Screw at Un-Lock position
Once you set the two screws in Un-Lock position you will be able to remove the LFT PCBA from the

bottom housing.

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3.7.6 Replacing SG Main PCBA, R71. (R71MD3, R71MD6, R71MD15 & R71MD35)

Model R71MD15 is shown below.

1. Remove 4 cables from the main PCBA.

2. Remove the 3 screws securing the main PCBA with the base bottom housing.

R71 load cell type SG.

Ranger 7000® Series Service Manual 45 Ohaus Corporation www.ohaus.com

1. Remove the below cables from the main PCBA.

Location for the 4 cables.

A Cable, RS422 cable from main PCBA to R71 Display Terminal.
B Cable, Cable link from main PCBA to LFT PCBA.
C Cable, Red White Cable link from main PCBA to LFT PCBA.
D Cable, Load Cell cable.

Ohaus Corporation www.ohaus.com 46 Ranger 7000® Series Service Manual

2. After removing the above 4 cables now locate and remove 3 screws which securing the main

PCBA to the bottom housing.

Ranger 7000® Series Service Manual 47 Ohaus Corporation www.ohaus.com

4 TESTING

Before and after servicing a Ranger 7000® scale, an operational test and various performance tests
should be made to confirm if the scale meets specifications. Turn the scale on and allow it to warm up
for at least one hour before performing these tests. The Analytical models need up to 4 hours to
stabilize.

NOTE:

Make sure the test area is free from drafts and that the scale rests on a level and vibration-free
surface. The Analytical models especially need a solid platform, such as a stone table.

4.1 TEST MASSES REQUIRED

The masses required to test the Ohaus Ranger 7000® scales must meet the requirements of the
ASTM or OIML Tolerances listed in the table. Poor quality calibration masses be the can cause of
frustrating diagnostics.

TABLE 4-1 CALIBRATION MASS VALUES

Ohaus Corporation www.ohaus.com 48 Ranger 7000® Series Service Manual

4.1.1 OPERATIONAL TEST

1. Connect a functioning Power Adapter to the scale.

2. Plug the Power Cord into a suitable power source.

3. Verify that the scale start up sequence occurs properly. Note any error codes.

4.2 LOAD CELL TEST USING RAMP

To test the Load Cell using RAMP, see Chapter 6.3.

4.3 PERFORMANCE TESTS

Accurate performance of the Ranger 7000® scale s is determined by a series of four performance
tests. The displayed readings are compared with the tolerances listed in Tables 1-1. Tolerance
values are expressed in counts. A one-count difference is shown in the last digit on the scale
display.

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 specifications listed in Table
1-1. Before proceeding with the following tests, the scale should be warmed up (60 minutes) and
calibrated. (See Appendix A).

4.3.1 Precision Test

The Precision Test is a quick test that measures the deviation of a limited number of weight
readings. If the scale passes the precision test than the following tests should be performed.

Note: This is a reference test for approved models (OIML and NTEP). It is not a required test but it
can be used to determine if the scale is working properly.

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

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

3. Remove the mass. The reading should return to 0g ± 1d.

4. Repeat this test three times. The readings should be within ± 1d. If so, the scale passes the
Precision Test.

If the deviation for any set of readings (using the same mass placed on the center of the Pan) is
greater than 1d, the scale does not meet the precision specification. Inspect and correct the
following areas:

- Check for mechanical obstructions. Any foreign object pressing any part of the moving
assemblies will cause a scale 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)

- If the scale does not pass this test, the Load Cell may need to be replaced.

Ranger 7000® Series Service Manual 49 Ohaus Corporation www.ohaus.com

4.3.2 Repeatability Test (non-approved models)

The repeatability specification is defined as the Standard Deviation value derived from a set of
weight readings. This test uses more weight data than the Precision Test and will allow for
occasional weight deviations due to testing variations.

Note: The required method for approved models (OIML and NTEP) is shown in the following
section.

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.

Set Up:

Before starting a repeatability test, set up the instrument as follows.
Enter the service menu (see Chapter 6) and adjust and record the following settings:

•

Set the Stability setting to 0.5d (its lowest setting).

•

Set the Filter level to “Middle”.

•

Set the AZT (Auto Zero Tracking) to .5d (its lowest setting). Do not turn it off.

Enter the User Menu (see 1.8.1) and adjust the following settings:

•

Set the instrument to display the same units as the performance specifications.

(Usually kg, g, or mg)

Record Test Parameters:

•

Stability Setting = ____________

•

Filter Level Setting = ____________

•

Auto Zero Tracking Setting = ____________

•

Displayed Units = ____________

•

Mass Used = ____________

Test Procedure:

1. Zero the instrument.

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 with the ten (10) readings.

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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).
Mean = (Reading 1 + Reading 2 + Reading 3 + Reading 4 + Reading 5+ 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 scale does not meet specifications, check environmental conditions, ensure that the

scale 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).

Ranger 7000® Series Service Manual 51 Ohaus Corporation www.ohaus.com

Repeatability Test – Approved models
This test is a variation of the test above. Rather than determining acceptance based on the

standard deviation of the errors, MPE is used. The other variation is that 2 series of weighings are
used, one near 50% of max and the other near 100% of maximum capacity.

1. See Table 1-1 to determine the two weight values that must be used.

2. Record 10 reading using each weight value. Zero the scale between each reading if

necessary.

3. The difference between the results of the 10 readings must be less than the absolute value

of the Maximum Permissible Error (MPE) for the load. The MPE for each load in grams is
given in Table 1-1.

4.3.3 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.

This is a reference test for approved scale s as there is no linearity specification. The approved
models should be able to pass this test so it is still valid to determine scale performance.

NOTE:

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

TABLE 4-3 LINEARITY TEST - REFERENCE AND LOAD MASSES

Model Load 1

R71MHD3 0kg
R71MHD6 0kg

R71MHD15

R71MHD35

R71MD3

R71MD6

R71MD15

R71MD35

0kg
0kg
0kg
0kg
0kg
0kg

Load 2 Load 3

1.5kg 3kg

3kg 6kg

10kg 15kg

20kg 35kg

1.5kg 3kg

3kg 6kg

10kg 15kg

20kg 35kg

NOTE: All masses are nominal values. Be certain to use the same reference mass throughout the
procedure.

1. Place the Reference Mass on the scale, record the weight and remove.

2. Place Load 1 on the scale and press TARE.

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

4. Place Load 2 on the scale and press TARE.

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

6. Place Load 3 on the scale and press TARE.

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 the tolerance in Table 4-2. If
the differences are out of tolerance, verify the test conditions and repeat the test.

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

Ohaus Corporation www.ohaus.com 52 Ranger 7000® Series Service Manual

4.3.4 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. OCL test may also be referred to as a Shift Test
(NTEP) or an Eccentricity Test (OIML).

The test weight used in this test 1/3 the capacity of the scale. See table for the test weight values.

TABLE 4-4 OFF CENTER LOAD MASS VALUES

Model OCL Mass Value Notes

R71MHD3 0 kg, 1.5 kg, 3 kg
R71MHD6 0 kg, 3 kg, 6 kg

R71MHD15

R71MHD35 0 kg, 20 kg, 35 kg

R71MD3

R71MD6

R71MD15

R71MD35

0 kg, 10 kg, 15 kg

0 kg, 1.5 kg, 3 kg

0 kg, 3 kg, 6 kg
0 kg, 10 kg, 15 kg
0 kg, 20 kg, 35 kg

1. The class of test weight to be use during OCL is not critical.

2. Use large weights where possible. Smaller weights can be

stacked on the larger but a stability problem may occur if many

smaller weights are used. If weights cannot be stacked they

must be placed uniformly over the segment.

The test positions (A-D) must be centrally located in each segment.

B

A

Round Pan Rectangular Pan

C

D

B

A

C

D

Procedure:

1. Set AZT (Auto Zero Tracking) to off. This setting is located in Menu - Scale Setup - AZT menu.

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

3. Tare the scale.

4. Move the weight to location A and record the reading (when stability indicator comes on).

5. Move the weight to location B and record the reading.

6. Move the weight to location C and record the reading.

7. Move the weight to location D and record the reading.

8. Maximum allowable change in displayed weight readings for each of the four positions can be
found in Specifications Tables (Chapter 1). If this maximum is exceeded verify the test
conditions and retest the scale. If there is no improvement the load-cell must be replaced.

Ranger 7000® Series Service Manual 53 Ohaus Corporation www.ohaus.com

Note: In high resolution scales (Class I) it may be necessary to zero or tare between each
location.

Ohaus Corporation www.ohaus.com 54 Ranger 7000® Series Service Manual

5 PARTS LISTS & DIAGRAMS

This section of the manual contains parts lists and exploded views for the Ranger 7000® scale s.
These are designed to identify the parts which can be serviced on the scale in the field. The parts list
and exploded views are separated into separate sections for the Terminal and the Base.

To order spare parts, identify the required item in the exploded views and parts list, then use the
Spare Parts List to obtain the current part number for this item.

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 office, or www.ohaus.com.

Ranger 7000® Series Service Manual 55 Ohaus Corporation www.ohaus.com

5.1 TERMINAL SPARE PARTS

Ohaus Corporation www.ohaus.com 56 Ranger 7000® Series Service Manual

TABLE 5-1 TERMINAL SPARE PARTS

Drawing
Item

Part

Number Description
1 30095939 SP Overlay R71 Terminal
2 30095940 SP 4.3" TFT Display R71 Terminal
3 30095930 SP PCBA, Terminal R71
4 30103748 SP 8PIN Connector Terminal, R71
5 30095941 SP Bracket, Docking, R71
6 30095907 SP Hardware Kit, R71

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5.2 BASE SPARE PARTS (R71MD3 and R71MD6)

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TABLE 5-2 BASE SPARE PARTS (R71MD3 AND R71MD6)

Drawing
Item

Part

Number Description
1 30095934 SP Pan, SM, SG, R71
2 30113444 SP Rubber Parts Kit, Small base, R71
3 30041419 SP Adapter, with-cable, EX HiCap, R71
4 30095908 SP Cables Kit, R71
5 30095907 SP Hardware Kit, R71
6 30095937 SP SG Loadcell, 5kg, R71
7 30076250 SP PCBA, LFT, EX HiCap, R71
8 30095909 SP PCBA, Base, SG, R71

30041267 SP Power-Cord US EX HiCap, R71
30041462 SP Power-Cord EU EX HiCap, R71
30041463 SP Power-Cord CN EX HiCap, R71

9

30041464 SP Power-Cord UK EX HiCap, R71
30041465 SP Power-Cord AU EX HiCap, R71
30041466 SP Power-Cord JP EX HiCap, R71

30041469 SP Power-Cord KR EX HiCap, R71
10 30095936 SP RS422 Cable Base R71
11 30035606 SP Feet Kit R21, R31, V71, V22, V41, R71

30095932 SP Packaging Assembly,SM,R71
30095933 SP Packaging Assembly,LA,SG,R71
30078209 Box,SM,R71

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5.3 BASE SPARE PARTS (R71MD15 and R71MD35)

Ohaus Corporation www.ohaus.com 60 Ranger 7000® Series Service Manual

TABLE 5-3 BASE SPARE PARTS (R71MD15 AND R71MD35)

Drawing
Item

Part

Number Description
1 30095934 SP Pan, SM, SG, R71
2 30113444 SP Rubber Parts Kit, Small base, R71
3 30041419 SP Adapter, with-cable, EX HiCap, R71
4 30095908 SP Cables Kit, R71
5 30095907 SP Hardware Kit, R71
6 30095937 SP SG Loadcell, 5kg, R71
7 30076250 SP PCBA, LFT, EX HiCap, R71
8 30095909 SP PCBA, Base, SG, R71

30041267 SP Power-Cord US EX HiCap, R71
30041462 SP Power-Cord EU EX HiCap, R71
30041463 SP Power-Cord CN EX HiCap, R71

9

30041464 SP Power-Cord UK EX HiCap, R71
30041465 SP Power-Cord AU EX HiCap, R71
30041466 SP Power-Cord JP EX HiCap, R71

30041469 SP Power-Cord KR EX HiCap, R71
10 30095936 SP RS422 Cable Base R71
11 30035606 SP Feet Kit R21, R31, V71, V22, V41, R71

30095932 SP Packaging Assembly,SM,R71
30095933 SP Packaging Assembly,LA,SG,R71
30078209 Box,SM,R71

Ranger 7000® Series Service Manual 61 Ohaus Corporation www.ohaus.com

5.4 BASE SPARE PARTS (R71MHD3 and R71MHD6)

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TABLE 5-4 BASE SPARE PARTS (R71MHD6 AND R71MHD6)

Drawing
Item

Part
Number

Description
1 30095935 SP Pan,SM ,MFR, R71
2 30113444 SP Rubber Parts Kit, Small base, R71
3 30041419 SP Adapter, with-cable, Ex HiCap, R71
4 30095908 SP Cables Kit, R71
5 30095907 SP Hardware Kit, R71
6 30095903 SP MFR Loadcell 4kg, R71
7 30076250 SP PCBA,LFT,EX HiCap, R71
8

30111916 SP PCBA, Base, MFR,R71

30041267 SP Power-Cord US EX HiCap, R71
30041462 SP Power-Cord EU EX HiCap, R71
30041463 SP Power-Cord CN EX HiCap, R71

9

30041464 SP Power-Cord UK EX HiCap, R71
30041465 SP Power-Cord AU EX HiCap, R71
30041466 SP Power-Cord JP EX HiCap, R71

30041469 SP Power-Cord KR EX HiCap, R71
10 30095936 SP RS422 Cable Base R71
11 30035606 SP Feet Kit R21, R31, V71, V22, V41, R71

30095932 SP Packaging Assembly,SM,R71
30095933 SP Packaging Assembly,LA,SG,R71
30078209 Box,SM,R71

Ranger 7000® Series Service Manual 63 Ohaus Corporation www.ohaus.com

5.5 BASE SPARE PARTS (R71MHD15 and R71MHD35)

Ohaus Corporation www.ohaus.com 64 Ranger 7000® Series Service Manual

TABLE 5-5 BASE SPARE PARTS (R71MHD15 and R71MHD35)

Drawing
Item

Part
Number

Description
1 30095935 SP Pan,SM ,MFR, R71
2 30113444 SP Rubber Parts Kit, Small base, R71
3 30041419 SP Adapter, with-cable, Ex HiCap, R71
4 30095908 SP Cables Kit, R71
5 30095907 SP Hardware Kit, R71
6 30095903 SP MFR Loadcell 4kg, R71
7 30076250 SP PCBA,LFT,EX HiCap, R71
8

30111916 SP PCBA, Base, MFR,R71

30041267 SP Power-Cord US EX HiCap, R71
30041462 SP Power-Cord EU EX HiCap, R71
30041463 SP Power-Cord CN EX HiCap, R71

9

30041464 SP Power-Cord UK EX HiCap, R71
30041465 SP Power-Cord AU EX HiCap, R71
30041466 SP Power-Cord JP EX HiCap, R71

30041469 SP Power-Cord KR EX HiCap, R71
10 30095936 SP RS422 Cable Base R71
11 30035606 SP Feet Kit R21, R31, V71, V22, V41, R71

30095932 SP Packaging Assembly,SM,R71
30095933 SP Packaging Assembly,LA,SG,R71
30078209 Box,SM,R71

Ranger 7000® Series Service Manual 65 Ohaus Corporation www.ohaus.com

6 ACCESSING THE SREVICE MENU.

6.1 Accessing the Service Menu (Super Password).

With any User you created in 'User Profiles' by pressing and holding the '0/User' key during
weighing mode you will be able to select the pre-set User Profiles. By keying the Super
Password 'OHR71' you will be able to see 'Service Menu' under 'Maintenance' – 'Diagnosis'
as shown below.

1. Press and hold '0/User' button, you will see the preset User Profiles.

2. By selecting the far right button you will come to the below window screen.

3. Key in Super Password 'OHR71' you will be able to gain access into 'Service Menu'.

Ranger 7000® Series Service Manual 66 Ohaus Corporation www.ohaus.com

6.2 Creating UserLogin.

1. If you are unable to see the above 'User Login' after you long press '0/User) key this
mean there is no user profile database been created and you need to create the user
profile.

2. Proceed to 'Menu' and select 'User Profile'.

3. Start keying in your user profile information by selecting the 'add record' button.

4. Key in the 'User' name, 'Password' and 'ConfirmPassword', below show example User
(1), Password (123) and ConfirmPassword (123).

Ohaus Corporation www.ohaus.com 67 Ranger 7000® Series Service Manual

After saving the information you will be able to see the User under 'User Profiles'. Now by
following step 1 to 3 you will be able to gain access into 'Service Menu'.

5. Key in the Super password 'OHR71' and press Enter key you will return back to normal
weighing mode.

Ranger 7000® Series Service Manual 68 Ohaus Corporation www.ohaus.com

6. Proceed to 'Main Menu' and select 'Maintenance'.

Ohaus Corporation www.ohaus.com 69 Ranger 7000® Series Service Manual

7. Now you will be able to see the 'Service Menu'

6.3 Under Service Menu.

1. Under 'Service Menu' you will have the below options.

• 'RAMP' value- typical value range from 50-80% (varies depends on models) and value
should not be 0 or 100%.

• Expand – For R and D usage.

• Factory Linear Cal – Using external weights to perform linearity calibration, follow

screen instruction.

Ranger 7000® Series Service Manual 70 Ohaus Corporation www.ohaus.com

• Firmware Update – updating base and terminal firmware.

Note: When downloading Terminal Software using Ohaus Repair and Service Tool the file is
type *.mot. If downloading via the USB host is type *.bin. The software need to be put in the
"R71_FW" folder under the root folder of the flash driver otherwise the terminal will not be able
to locate the *.bin file.

Ohaus Corporation www.ohaus.com 71 Ranger 7000® Series Service Manual

1. Create a "R71_FW" folder at the root folder of a flash driver.
Put following files into the folder

• When you plug in the USB flash drive into the R71 terminal with the respective bin file
in it you will be able to see the below example information once you select the
Firmware Update option.

Make sure the right object files were put in the
connected USB flash drive.

Base image found Current Terminal: 1.03
Terminal image found Current Base: 1.00.02

If the USB Flash drive is not plug in you will see the below message.

USB flash drive is not connected.
Base image found Current Terminal: 1.03

Terminal image found Current Base: 1.00.02

• Format Alibi Memory – Formatting/Erasing Alibi memory.

Ranger 7000® Series Service Manual 72 Ohaus Corporation www.ohaus.com

6.4 Maintenance (Diagnostic).

1. Under 'Diagnostic' you will have the below options.

• LCD diagnostic – 4 diagnostic test will be perform on the color LCD screen for RED,
Green, Blue color test and BackLight Test.

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• 4 key tests- testing the functionality of the keypad membrane, the below 4 keys will be
tested during this diagnostic.

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75

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6.5 Disable 'Service Menu'.

1. Press and hold '0/User' button, you will see the preset User Profiles.

2. By selecting the far right button you will come to the below window screen.

Ranger 7000® Series Service Manual 76 Ohaus Corporation www.ohaus.com

3. Key in previously set User password example'123' you will disable the 'Service Menu'
as shown below.

Ohaus Corporation www.ohaus.com 77 Ranger 7000® Series Service Manual

APPENDIX A

The Software Service Tool (Part Number 83032124) is required when a main PC Board is replaced in
a Ranger 7000® scale. It is used to re-configure the scale to its original parameters in the case of a
PCB replacement. The tool can also be used to communicate with the scale using commands that are
listed at the end of the appendix.

The latest software service tool and support files are available on the Ohaus DMX site.
Please read the Service Tool Instruction Manual (Part Number 30032352) which is also available on

Ohaus DMX site.

–

COMMUNICATION

A.1 Scale Commands.

The scale commands are used to send instructions to the scale. Commands listed in the
following table will be acknowledged by the scale. The scale will return “ES” for invalid
commands.

TABLE A-1 INTERFACE COMMAND LIST

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General Notes:

•

Commands sent to the indicator must be terminated by a carriage return (CR) or a carriage

return-line feed (CRLF).

•

Alternate command characters may be defined by the user.

•

Data output is always terminated with a carriage return-line feed (CRLF).

•

There is 40-second timeout control for print under stable requirement. If the unstable

condition continues over 40 seconds, scale will respond “ES”.

A.2 RS232 (DB9) Pin Connections

Use the built-in RS-232 Port to connect either to a computer or a printer.

A.3 USB Host

The USB Host can be used to connect a barcode scanner and USB flash drive to the Ranger 7000.

A.3.1 Printout Format
A.3.2 Printout string for g, kg, lb, oz units:

•

The printout string has a fixed length of 23 characters.

•

Each Space field is a delimiting space used to separate the other fields.

•

The Weight field is 9 right justified characters. If the value is negative, the '‐' character is

printed at the immediate left of the most significant digit.

•

The Unit/Mode field is 3 left justified characters.

•

The Stability field is 1 character.

•

The G/N field is 1 character. 'G' is printed for a gross weight. 'N' is printed for a net weight.

•

The Message field is 5 left justified characters.

Note: The Termination Characters Carriage Return and Line Feed are appended to the printout.

Ohaus Corporation www.ohaus.com 79 Ranger 7000® Series Service Manual

A.3.3 Printout string for the lb:oz unit

•

The printout string has a fixed length of 28 characters.

•

Each Space field is a delimiting space used to separate the other fields.

•

The Weight1 field is 4 right justified characters. If the value is negative, the '‐' character is

located at the immediate left of the most significant digit.

•

The Unit1 field is 2 left justified characters.

•

The Weight2 field is 7 right justified characters.

•

The Unit2 field is 2 left justified characters.

•

The Stability field is 1 character. A space is printed if the weight value is stable. A '?' is printed

if the weight value is not stable.

•

The G/N field is 1 character. 'G' is printed for a gross weight. 'N' is printed for a net weight.

•

The Message field is 5 left justified characters.

Note: The Termination Characters Carriage Return and Line Feed are appended to the printout.

Ranger 7000® Series Service Manual 80 Ohaus Corporation www.ohaus.com

APPENDIX B.
Note: Make sure OHAUS Service & Repair Tools is version V2.1.1.1 or later which is available

for down load in DMX under 'Service Software' folder.
B.1 Software Installation and Software Selection:

The OHAUS Software Service & Repair Tool is used for 5 purposes:

1. To restore EEPROM data, if there is any possible data corruption.

2. To install a new Load Cell.

3. To install a new Main Printed Circuit Board (PCB).

4. To update the software in the scale.

5. For diagnostics.

SOFTWARE SERVICE & REPAIR TOOL INSTRUCTIONS

Install the software on a Personal Computer running Microsoft Windows NT 4.0 or later, or Microsoft
Windows 98 or later. Insert the CD and run Setup.exe.

After installation, run the program Service & Repair Tools. The program has 2 selections, select
'Repair Tools' when performing scale repair and click 'Next'.

Figure B-1. Software Selection

Ohaus Corporation www.ohaus.com 81 Ranger 7000® Series Service Manual

B.2 Product Selection:
Select the appropriate product that you wish to service and click 'Next'.

Figure B-2. Product Selection.

B.3 To Restore the EEPROM data:

1. Record the following information from the scale to be repaired:
a. Serial Number from the label on the back of the scale.

b. Model Number from the label on the back of the scale.
c. IDNR Number, just above the label on the back of the scale.

d. The load cell serial number (you need to open the scale and record this information on

the load cell.)

2. Contact Ohaus Corporation in Pine Brook NJ, and request the data file to download.

Provide the information recorded above.

3. After receiving the data file from Ohaus, continue with the following steps.

4. Connect the scale to the PC and start the OHAUS Software Service Tool.

5. Click the tab labeled Restore EEPROM and select Write Image File and click 'Next'.

Ranger 7000® Series Service Manual 82 Ohaus Corporation www.ohaus.com

Figure B-3. Restore EEPROM.

Figure B-4. Write Image File.

Ohaus Corporation www.ohaus.com 83 Ranger 7000® Series Service Manual

B.4 COM Port Configuration.

1. Configure the software Com port configuration to match with the scale and click 'Next'.

Figure B-5. COM Port Configuration.

Note: Make sure there is no lose connection from R71 RS232 Port during the communication process.

2. Enter the scale’s Serial Number and IDNR number.

3. Enter the path to the image file, or click the Browse button to locate the file.

4. Click the Next button.

5. The software will indicate the download progress. When complete, disconnect the power from
the back of the scale, then re-connect.

6. Perform Service Calibrations (see Chapter 6). Test the scale.

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Figure B-6. Write Image File.

B.5 To Replace a Load Cell:

7. Follow the steps in Section 3.5 and 3.6 to replace the defective load cell.

8. Open the packet containing labels that was supplied with the replacement Load Cell. These
labels each contain a model number followed by the IDNR number.
Carefully select the label that matches exactly the model number of the scale.

9. Get the scale Image File from OHAUS by providing the scale model and serial number.

10. Put the new label on the scale.

11. Power the scale from an AC adapter.

12. Connect the scale to your computer.

13. Start the OHAUS Service Tool Software.

14. Click on the tab labeled Replace Loadcell.

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Figure B-7. Replace Loadcell Tab.

Figure B-8. Function selection Replace Loadcell.

15. Configure the Com Port Configuration (B.2) and click 'Next'.

16. Key in the scale serial number, Model number, Temperature Reference in Celsius and select
your region (AP, EU/GB or US).

17. Enter the IDNR number (xxx.xx.xx.xxxx) from the label on the back of the scale or from the
packet label of the new load cell.

18. Click the Start button.

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19. The software will indicate the download progress. When complete, disconnect the power from
the back of the scale, then re-connect.

20. Perform Service Calibrations (see Appendix B). Test the scale.

B.6 Install New Main Printed Circuit Board (PCBA).

1. Follow steps in Sections 3.7.3 and 3.7.6 to replace the PCBA. Then connect the scale to your
computer.

2. Start the OHAUS Service and Repair Tool Software.

3. Click on the tab labeled Replace Main PCBA.

Figure B-9. Replace Main PCBA Tab.

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Figure B-10. Function Selection Replace Main PCB.

4. Enter the Serial Number from the label on the side of the scale.

5. Enter the IDNR number (xxx.xx.xx.xxxx) from the label on the back of the scale

6. Key in the Model number and Shipping Country (AP, EU/GB or US)

7. Click the Start button

8. The software will indicate the download progress. When complete, disconnect the power from
the back of the scale, then re-connect.

9. Perform Service Calibrations (see Chapter 6). Test the scale (Chapter 4).

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B.7 Update the Software in the Scale:

1. Connect the Scale to your computer.

2. Start the OHAUS Service Tool Software.

3. Click on the tab labeled Download Software.

Figure B-11. Download Software Tab.

4. You will have two options to choose Down load Base Software and Down load Terminal
Software, select the process you wish to perform.

B-12. Download Base Software and Download Terminal Software tab.

Note: When downloading Terminal Software using Ohaus Repair and Service Tool the file is
type *.mot. If downloading via the USB host is type *.bin.

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Lower

5. After making the selections enter the path to the file to download, or click the Browse button to
locate the file.

6. Click on the Start Download button.

7. When prompted, disconnect the power from the back of the scale, then re-connect.

8. The software will indicate the download process. When complete, disconnect the power from
the back of the scale, then re-connect.

9. Perform Service Calibrations (see Chapter 6). Test the scale.

B.8 Diagnostics

1. Connect the scale to your computer.

2. Start the OHAUS Software Service Tool.

3. Click on the tab labeled “Diagnostics.”

Raise

Figure B-12. Diagnostics Tab.

4. To test communications, click the Print button, or enter an RS232 Command String (from
Table 1-6) and USB Input (1-7) and click the Send button. The scale will response will be
shown in the box on the right.

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Figure B-13. Diagnostics Command Testing.

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www.ohaus.com

*30136740*

P/N 30136740A © 2014 Ohaus Corporation, all rights reserved
™ Registered trademark of Ohaus Corporation.

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.

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