Rice Lake Scout Pro Series Portable, Ohaus User Manual
SERVICE MANUAL
SCOUT® PRO BALANCES
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000
SERVICE MANUAL
SCOUT® PRO BALANCES
The information contained in this manual is believed to be accurate at the time of publication, but Ohaus
Corporation assumes no liability arising from the use or misuse of this material. Reproduction of this
material is strictly prohibited.
Material in this manual is subject to change.
© Copyright 2003 Ohaus Corporation, all rights reserved.
® Registered trademark of Ohaus Corporation.
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
1.1 Introduction ............................................................................................................. 1-1
1.2 Service Facilities .....................................................................................................1-1
1.3 Tools and Test Equipment Required ....................................................................... 1-2
1.3.1 Special Tools and Test Equipment List ............................................................. 1-2
1.3.2 Standard Tools and Test Equipment List ........................................................... 1-2
1.4 Test Masses Required ............................................................................................ 1-2
1.5 Specifications .......................................................................................................... 1-3
CHAPTER 2 DIAGNOSIS
2.1 Troubleshooting ......................................................................................................2-1
2.2 Diagnostic Guide..................................................................................................... 2-1
2.2.1 Diagnosis...........................................................................................................2-1
2.3 Error Codes ............................................................................................................. 2-4
CHAPTER 3 REPAIR PROCEDURES
3.1 Repair Procedures ..................................................................................................3-1
3.1.1 Cover Removal .................................................................................................. 3-1
3.1.2 Printed Circuit Board Replacement ...................................................................3-2
3.1.3 Transducer Replacement .................................................................................. 3-4
Page No.
CHAPTER 4 TESTING
4.1 Testing .................................................................................................................... 4-1
4.1.1 Operation Test ...................................................................................................4-1
4.1.2 Segment Display Test ........................................................................................ 4-1
4.2 Performance Tests .................................................................................................. 4-1
4.2.1 Repeatability Test .............................................................................................. 4-2
4.2.2 Off-Center Load Test .......................................................................................... 4-3
4.2.3 Linearity Test .....................................................................................................4-3
4.3 Down Stop Adjustment............................................................................................4-4
CHAPTER 5 DRAWINGS AND PARTS LISTS
5.1 Drawings ................................................................................................................. 5-1
5.2 Parts Lists................................................................................................................ 5-3
APPENDIX A SERVICE TOOL INSTRUCTIONS
A. Service Tools Instructions ...................................................................................... A-1
A.1 Requirements for Scout Pro Tools ......................................................................... A-1
A.2 Software Installation ............................................................................................... A-1
A.3 Hardware Installation ............................................................................................. A-1
A.4 Special Instructions for USB Interface .................................................................... A-2
A.5 Using Configtool.Exe ............................................................................................. A-3
A.6 Final Service Calibration........................................................................................ A-5
i
APPENDIX B FACTORY CALIBRATIONS
Page No.
B. Factory Calibrations ............................................................................................... B-1
B.1 Service Calibration................................................................................................. B-1
B.2 Factory Calibration................................................................................................. B-3
LIST OF TABLES
TABLE NO. TITLE
Page No.
1-1 Calibration Points ................................................................................................. 1-2
1-2 Specifications .......................................................................................................1-3
2-1 Diagnostic Guide .................................................................................................. 2-2
2-2 Error Codes .......................................................................................................... 2-4
4-1 Types of Performance Tests ................................................................................. 4-1
4-2 Test Masses ......................................................................................................... 4-3
4-3 Test Mass Values ................................................................................................. 4-5
4-4 Transducer Adjustment Tolerances......................................................................4-5
5-1 Replacement Parts List ........................................................................................ 5-3
LIST OF ILLUSTRATIONS
FIGURE TITLE
Page No.
3-1 Shipping Lock....................................................................................................... 3-1
3-2 Bottom of Balance ................................................................................................ 3-1
3-3 Printed Circuit Board removal............................................................................... 3-2
3-4 Transducer Removal ............................................................................................ 3-4
4-1 LCD Full Display .................................................................................................. 4-1
4-2 Transducer Front View - Down Stop Adjustment .................................................. 4-4
5-1 Scout Pro Exploded View .....................................................................................5-2
A-1 Screw and Housing Removal .............................................................................. A-2
A-2 Connector J3 Location......................................................................................... A-2
A-3 Connector J3 Shorted.......................................................................................... A-2
A-4 Screen 1 .............................................................................................................. A-3
A-5 Screen 2 .............................................................................................................. A-4
A-6 Screen 3 .............................................................................................................. A-4
A-7 Screen 4 .............................................................................................................. A-5
B-1 IC U9 Connections .............................................................................................. B-2
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CHAPTER 1 INTRODUCTION
1.1 INTRODUCTION
This service manual contains the information needed to perform routine maintenance and service on
the Ohaus Scout ® Pro Balances. The contents of this manual is contained in five chapters and are
listed as follows:
Chapter 1 Introduction - Contains information regarding service facilities, tools, test equipment,
calibration masses and specifications.
Chapter 2 Diagnosis - Contains a diagnostic guide for troubleshooting problems and error code
tables.
Chapter 3 Repair Procedures - Contains disassembly/assembly and replacement procedures.
Chapter 4 Testing - Contains an operational test, a segment display test and performance tests.
Chapter 5 Drawings and Parts Lists - Contains an exploded view drawing and a parts list.
Before servicing the balance, you should be familiar with the Instruction Manual which is packed with
every balance. The procedures in this manual assumes the technician performing them has a working
knowledge of the use of standard hand tools and the repair of precision instruments.
1.2 SERVICE FACILITIES
To service the Scout® Pro balances, the service area should meet the following requirements:
Should be temperature controlled and meet the balance specifications for temperature
environmental requirements. See specifications for temperature ranges of the various
models.
Must be free of vibrations such as fork lift trucks close by, large motors, etc.
Must be free of air currents or drafts from air conditioning/heating ducts, open windows,
people walking by, fans, etc.
Area must be clean and air must not contain excessive dust particles.
Work surface must be stable and level.
Work surface must not be exposed to direct sunlight or radiating heat sources.
1-1
CHAPTER 1 INTRODUCTION
1.3 TOOLS AND TEST EQUIPMENT REQUIRED
In order to properly service the Scout Pro balances, certain Ohaus special tools and test items are
required in addition to standard electronic tool kits. These items are listed as follows:
1.3.1 Special Tools and Test Equipment List
1. Alternate voltage Power Adapter if local power requirements do not match Balance
Adapter voltage ratings.
2. Scout Pro RS232 option PN 71147376.
3. A PC running Microsoft Windows NT 4.0 or later, or Microsoft Windows 98 or later.
3. Scout Pro instruction manual.
4. Scout Pro Tools.zip.
5. Set of Feeler gauges ranging from 0.40mm/0.16in. to 0.65mm/0.026in.
6. Micro sized alligator clip.
1.3.2 Standard Tools and Test Equipment List
1. Standard Electronics Tool Kit.
2. Digi t al Voltmeter ( DVM) Input impedance o f at leas t 10 megohms i n the 1 Vol t dc positio n.
3. Masses totaling up to 6000 grams are required. Ohaus makes various calibration sets
available. Please contact your nearest Ohaus dealer for further details.
1.4 TEST MASSES REQUIRED
The masses required to test the Scout Pro balances must meet or exceed the requirements of ASTM
Class 4 Tolerance. The calibration points are listed in Table 1-1.
TABLE 1-1. CALIBRATION POINTS
CAPACITY SPAN CAL POINT LINEARITY CAL POINTS
200g 200g 100g, 200g
400g 200g 200g, 400g
600g 300g 300g, 600g
2000g 2000g 1000g, 2000g
4000g 4000g 2000g, 4000g
6000g 6000g 3000g, 6000g
1-2
CHAPTER 1 INTRODUCTION
1.5 SPECIFICATIONS
Specifications for the Scout Pro balances are listed in Table 1-2. When a balance has been serviced,
it must meet the specifications listed in the table. Before servicing the balance, determine what
specifications are not met.
TABLE 1-2. SPECIFICATIONS
Capacity (g) 200 400 400 600 2000 4000 6000
Readability (g) 0.01 0.1 1.0
Repeatability (Std. Dev.) (g) 0.01 0.1 1.0
Off Center Loading (g) ±0.01 ±0.1 ±1.0
Linearity (g) ±0.01 ±0.1 ±1.0
Tare range To capacity by subtraction
Over Range Capacity Capacity + 90d
Stabilization Time 3 seconds
Operating Temp. Range 50° to 104° F/10° to 40° C
Power Requirements AC Adapter (included) 4 AA Batteries (not included)
Item Numbers SPx202 SPx402 SPx401 SPx601 SPx2001 SPx4001 SPx6000
1-3
CHAPTER 1 INTRODUCTION
1-4
CHAPTER 2 DIAGNOSIS
2.1 TROUBLESHOOTING
This section of the manual specifies problem areas of the balance which can occur. Information is
contained to isolate specific problems using Table 2-1, Diagnostic Guide, and Table 2-2, Error Codes.
Follow all directions step by step. Make certain that the work area is clean and use care when handling
components of the balance.
2.2 DIAGNOSTIC GUIDE
Table 2-1 is a diagnostic guide designed to help locate the problem area quickly and easily. To use
the table, first locate the symptom that you are observing. Follow the symptom column and review the
probable cause column and remedy column. The probable causes are listed with the most common
cause first. If the first remedy does not fix the problem, proceed on to the next remedy. Before
attempting to repair the Balance, read all chapters of this manual to familiarize yourself with the
balance components and operation. Do not attempt repairs unless you fully understand the operation
of the balance.
2.2.1 Diagnosis
1. Isolate and identify the symptom.
2. Refer to Table 2-1 Diagnostic guide and locate the symptom.
3. Follow the suggested remedies in the order that 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, it is necessary to
approach one area at a time, and also remember, that the
symptoms may be interrelated.
In the event that erratic or fluctuating weight readings are observed, it is necessary to isolate the
problem to either the mechanical area or the electronic area of the balance. The repeatability test will
quickly point out whether the Transducer (8) is operating properly or whether the problem is due to an
electronic malfunction.
If a problem arises that is not covered in this manual, contact Ohaus Corporation for further information.
2-1
CHAPTER 2 DIAGNOSIS
TABLE 2-1. DIAGNOSTIC GUIDE
SYMPTOM
No display.
Low BAT displayed.
Stays in segment check.
PROBABLE CAUSE
1. No power.
2. Power Jack defective.
3. Weak battery.
4. Battery connector - poor
contact.
5. PC Board defective.
1. Weak batt ery.
2. AC Adapter defective or
wrong type being used.
3. PC Board defective.
1. Weak batt ery.
2. PC Board defective.
REMEDY
1. Check AC Adapter.
2. Replace Power Jack.
3. Replace.
4. Clean or replace.
5. Replace PC Board.
1. Replace battery.
2. Replace AC Adapter.
3. Replace PC Board.
1. Replace battery.
2. Replace PC Board.
Always displays zero.
Cannot calibrate.
Displays (Err2)
1. Possible power surge.
2. Down stop improperly set.
3. Transducer not con nected.
4. Defective Transducer.
5. PC Board defective.
1. Incorrect calibration
masses.
2. Transducer not con nected.
3. Defective Transducer.
4. PC Board defective.
1. Missing Pan.
1. Perform linearity calibra tion.
2. Set per specifications.
3. Plug in Transducer.
4. Replace Transducer.
5. Replace PC Board.
1. Use correct masses.
2. Plug in Transducer.
3. ReplaceTransducer.
4. Replace PC Board.
1. Put pan on balance
2. Down Stop improperly
set.
3. Transducer zero has shifted.
2-2
2. Check stops and reset if
necessary.
3. Perform factory calibra tion B.1 or B.2
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