OHAUS Ranger 7000 R71MHD3 User manual

Ranger 7000®Scale
Service Manual

TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com i Ranger 7000
®
Service Manual
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

TABLE OF CONTENTS
Ranger 7000
®
Service Manual ii Ohaus Corporation www.ohaus.com
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

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

Ohaus Corporation www.ohaus.com 4 Ranger 7000
®
Series 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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®
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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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®
Series Service Manual
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 0.1 g 0.2 g 1 g 1 g
Repeatability
(std. dev.) 0.01 g 0.02 g 0.1 g 0.1 g
Linearity ± 0.02 g ± 0.04 g ± 0.2 g ± 0.2 g
Span Calibration
Points 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,
Weighing units gram, kilogram, ounce, pound, pound:ounce, ton
Applications Weighing, Parts Counting, Percent Weighing, Check Weighing,
Dynamic Weighing, Filling, Formulation, Differential Weighing, Density
Stabilization time
(typical) Within 1 second
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 240 x 240 mm 377 x 311 mm
9.4 x 9.4 inch 14.8 x 12.2 inch
Terminal
Housing
dimensions 267 x 118 x 72 mm
(W x D x H) 10.5 x 4.6 x 2.8 in
Base Housing
dimensions 280 x 280 x 114 mm 377 x 311 x 128 mm
(W x D x H) 11 x 11 x 4.5 inch 14.9 x 12.2 x 5 inch
Assembled
dimensions 280 x 420 x 114 mm 377 x 467 x 128 mm
(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 14.4 kg / 31.7
lb

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®
Series Service Manual 7 Ohaus Corporation www.ohaus.com
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 0.5 g 1 g 2 g 5 g
Repeatability
(std. dev.) 0.05 g 0.1 g 0.2 g 0.5 g
Linearity ± 0.1 g ± 0.2 g ± 0.4 g ± 1 g
Span Calibration
Points 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
Weighing units gram, kilogram, ounce, pound, pound:ounce, ton
Applications Weighing, Parts Counting, Percent Weighing, Check Weighing, Dynamic
Weighing, Filling, Formulation, Differential Weighing, Density
Stabilization time
(typical) Within 1 second
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 280 x 280 mm 377 x 311 mm
11 x 11 inch 14.8 x 12.2 inch
Terminal
Housing
dimensions 267 x 118 x 72 mm
(W x D x H) 10.5 x 4.6 x 2.8 in
Base Housing
dimensions 280 x 280 x114 mm 377 x 311 x 128 mm
(W x D x H) 9.4 x 9.4 x 4.5 inch 14.9 x 12.2 x 5 inch
Assembled
dimensions 240 x 420 x 114 mm 377 x 467 x 128 mm
(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 13.4 kg / 29.5
lb

Ohaus Corporation www.ohaus.com 8 Ranger 7000
®
Series Service Manual
1.5 OPERATION
1.5.1 Overview of the Controls

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®
Series Service Manual 9 Ohaus Corporation www.ohaus.com

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®
Series Service Manual
1.5.2 Principle Functions and Main Menu.
1-2 Menu and Screen Navigation

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®
Series Service Manual 11 Ohaus Corporation www.ohaus.com
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.

Ohaus Corporation www.ohaus.com 12 Ranger 7000
®
Series Service Manual
2.3 DIAGNOSTIC GUIDE
2.1 Diagnostic Guide
Error Code Description Cause
EEP Error EEPROM Checksum
Error Corrupted EEPROM data
Power on Overload Power On Error Weight reading exceeds
Power On Zero limit.
Power on Underload Power On Error Weight reading below
Power On Zero limit.
Overload Over Range Error Weight reading exceeds
Overload limit.
Underload Under Range Error Weight reading below
Underload limit.
Tare Error Tare out of range Error Tared at one unit but
after switching to
another unit the tare
value exceeds the
maximum.
Display Overflow Display Overflow Weight exceeds 6
digits.
No Calibration Calibration data error Calibration data does
not exist.
------- Busy message Displayed during tare
setting, zero setting,
printing
--NO-- Action not allowed
message Function not executed.
Calibration Error Calibration Error Calibration value
outside allowable limits
Low Reference Low reference weight
warning message Average Piece Weight too small. (Warning)
Reference Error Unacceptable reference
weight message Reference Weight too small. The weight on
the pan is too small to
define a valid reference
weight.

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®
Series Service Manual 13 Ohaus Corporation www.ohaus.com
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.

Ohaus Corporation www.ohaus.com 14 Ranger 7000
®
Series Service Manual
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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®
Series Service Manual 15 Ohaus Corporation www.ohaus.com
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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®
Series Service Manual
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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®
Series Service Manual 17 Ohaus Corporation www.ohaus.com
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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®
Series Service Manual
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.