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SERVICE MANUAL
SCOUT® PRO BALANCES
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000
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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.
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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
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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
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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
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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
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CHAPTER 1 INTRODUCTION
1-4
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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
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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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CHAPTER 2 DIAGNOSIS
TABLE 2-1. DIAGNOSTIC GUIDE (Cont.)
SYMPTOM
Displays (Err2) (Cont.).
Exceeds off center load limit.
Inaccurate readings.
Fluctuating readings.
PROBABLE CAUSE
4. Defective Transducer.
5. PC board defective.
1. Defective Transducer.
1. Improper calibration
(Span or Linearity).
2. Not zeroed before
weighing.
3. Defective Transducer.
4. PC Board defective.
1. Unstable environment.
2. Debris in balance.
3. PC Board defective.
4. Defective transducer.
REMEDY
4. Replace Transducer.
5. Replace PCB.
1. Replace Transducer.
1. Perform linearity calibra tion.
2. Press Zero On with no
weight on the Pan, then
weigh.
3. Replace Transducer.
4. Replace PC Board.
1. Check area for vibrations,
leveling and drafts.
2. Disassemble and clean if
necessary.
3. Replace PC Board.
4. Replace Transducer.
Drifting display.
Error code (Err#) on display.
5. Transducer Lock en gaged or misaligned.
1. Balance not warmed up.
2. Defective Transducer.
3. PC Board defective.
1. Balance has detected an
error condition.
2. Defective Transducer.
3. PC Board defective.
5. Unlock or realign.
1. Allow balance to stabi lize.
2. Replace Transducer.
3. Replace PC Board.
1. See Table 2-2, Error
Codes.
2. Replace Transducer.
3. Replace PC Board.
2-3
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CHAPTER 2 DIAGNOSIS
TABLE 2-1. DIAGNOSTIC GUIDE (Cont.)
SYMPTOM
RS232 Not functioning.
(On models equipped with
RS232).
2.3 ERROR CODES
Scout Pro balances are equipped with software which will display an error condition when it occurs.
Table 2-2 Error Codes, describes the various error codes which can appear on the display and
specifies the probable reason and remedy.
PROBABLE CAUSE
1. Improper Print Menu set tings.
2. RS232 not turned on.
3. RS232 does not stay on.
4. Loose or disconnected
RS232 option.
5. RS232 option defective.
REMEDY
1 . C h e c k a l l s e t t i n g s . ( M e n u
item Power must be set
to ON.)
2. Turn the option on. (See
instruction manual).
3. If batteries are being
used, the RS232 turns
off when the unit is turned
off. Either turn the option
on or use the ac adapter.
4. Check connection.
5. Replace RS232 option.
TABLE 2-2. ERROR CODES
DISPLAY REASON ACTION
Err 1 Invalid checksum data 1. Perform factory calibration.
2. Restore data file.
3. Check transducer.
4. Check PCB.
Err 2 Overload or Underload 1. Make sure the right pan is on the balance.
2. Perform service LIN calibration per B.1.
3. Check transducer.
4. Check PCB.
Err 4 Incorrect calibration mass 1. Calibrate using correct mass.
Err 5 Parts counting error 1. Sample is less than 1d. Change sample quantity
or increase sample.
Err 8 RS232 buffer is full 1. Check printing device.
Err 9 Internal data error 1. Restore data file.
2. Check PCB.
3. Check transducer.
2-4
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CHAPTER 3 REPAIR PROCEDURES
3.1 REPAIR PROCEDURES
This section of the manual contains detailed disassembly procedures of the balance. Refer to Figure
5-1. Before disassembling the balance, it should be noted that components inside of the balance are
delicate and need to be handled with care. It is imperative that the Transducer (8) should never be
subjected to any excessive torque, stress, or abrasion as damage may result. Once the balance has
been disassembled, any small scratch or abrasion made to any of the Individual Strain Gauges will
render the entire Transducer (8) unusable. The Printed Circuit Board (9) contains integrated circuits
which employ CMOS technology, therefore, caution must be exercised so as not to subject any of these
components to static electricity discharge. When servicing, a wrist Ground Strap with a 10 Megohm
series resistor to earth ground is highly recommended. The Printed Circuit Board (9) should be
handled by grasping the edges only and never placing fingers on any of the runs or traces.
3.1.1 Cover Removal
To disassemble the balance, proceed as follows:
1. Turn the balance off and if using an AC Adapter, disconnect it from the balance.
2. Remove the Pan (1, 2 or 3) from the balance. Pan sizes and shapes vary.
3. Place the Shipping Lock in the locked position.
See Figure 3-1. This will help protect the
Transducer.
4 . I f a b a t t e r y i s b e i n g u s e d , t u r n t h e b a l a n c e o v e r a nd r e m o ve t h e B a t t e r y C o mp a r t m e nt C o v e r
(12) as shown in Figure 3-2.
Cover Screws
Locked
Position
Pointer
Unlocked
Position
Figure 3-1. Shipping Lock.
12 Battery Compartment Cover
Figure 3-2. Bottom of Balance.
3-1
Cover Screw
Page 16
CHAPTER 3 REPAIR PROCEDURES
3.1.1 Cover Removal (Cont.)
5. Remove the 4 AA batteries from inside the battery compartment and replace the Battery
Compartment Cover (12).
6. Slide the Lockswitch to to the unlocked position to gain access to one of the cover screws.
Remove the 3 Cover Screws as shown in Figure 3-2.
7. Turn the balance over in an upright position and carefully lift the Top Cover (6) from the
balance Base (10).
8. After repairs and or adjustments have been made, reassemble the balance in the reverse
order.
3.1.2 Printed Circuit Board (9) Replacement
In an effort to keep service costs down, it is suggested that if the Printed Circuit Board (9) is suspected
of being faulty, it should be replaced rather than repaired.
To replace the Printed Circuit Board (9) , proceed as follows:
1. Remove the balance cover, refer to paragraph 3.1.1.
CAUTION
WHEN HANDLING THE PRINTED CIRCUIT BOARD,
HANDLE BY EDGES ONLY! DO NOT TOUCH FOIL SIDE
OF BOARD. STATIC DISCHARGE MAY DAMAGE SOME
COMPONENTS.
2. The Printed Circuit Board (9) is fastened in place by 2 clips which are part of the Base (10)
and 2 screws located on top of the Printed Circuit Board. In addition, a Calibration Lock
(15)(small plastic piece) is positioned at the front of the Printed Circuit Board. See Figure
3-3.
BLK
BASE
10
J6 CONNECTOR
CLIP
J11 RS232 CONNECTOR
CLIP
J2 BATTERY
CONNECTOR
RED
J6
J2
C4
LCD DISPLAY
J11
U7
U9
U8
CAL
MOUNTING
SCREW
9
PCB
15
CAL LOCK
MOUNTING
SCREW
Figure 3-3. Printed Circuit Board Removal.
3-2
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CHAPTER 3 REPAIR PROCEDURES
3.1.2 Printed Circuit Board (9) Replacement (Cont.)
3. When an RS232 option is installed, remove the RS232 Connector from J11on the Printed
Circuit Board (9).
4. Disconnect the Transducer cable from Connector J6 on the Printed Circuit Board (9).
5. Disconnect the battery cable from Connector J2 on the Printed Circuit Board (9).
6. Remove the 2 mounting screws on top of the Printed Circuit Board (9).
7. Push the Printed Circuit Board towards the back as far as it will go and apply a small forward
pressure to the Cal Lock (15). Lift up on the front of the Printed Circuit Board (9) to remove
it.
8. Install the new Printed Circuit Board (9). Make sure that the Printed Circuit Board is
positioned under the 2 clips on the Base (10).
9. Connect the flexible cable from the Transducer to Connector J6 on the Printed Circuit
Board (9).
10. Connect the RS232 to Connector J11 on the Printed Circuit Board (9) if the RS232 is
installed.
11. Connect the battery cable to connector J2 on the Printed Circuit Board (9).
12.Replace the 2 mounting screws on top of the Printed Circuit Board (9), make sure the board
is positioned as far forward as possible to ensure the calibration lock switch will operate
properly.
13. Reassemble the Balance.
14. Replace the batteries if previously removed.
15. See Appendix A Service Tools Instructions and load temperature compensation data.
16. Check the performance of the Balance and perform Factory Calibration B.2.
3-3
Page 18
CHAPTER 3 REPAIR PROCEDURES
3.1.3 Transducer (8) Replacement
There are 8 Transducer Kits that are available for replacement purposes. Each Kit is fully assembled
and consists of metal base plate, a transducer mounted to the base plate and a subplatform mounted
to the transducer. All adjustments such up stop and down stop (limits travel of the transducer to safe
limits) have been factory set. Transducer kits are available in the following ranges: 120g, 200g, 400g,
600g, 1200g, 2000g, 4000g and 6000g. Check the bottom of the balance and verify the capacity before
ordering a new transducer kit.
CAUTION
Extreme care must be exercised so as not to twist or
deform the Transducer in any way. Do not drop or hit
the Transducer. Any damage to the Transducer can
render it inoperative.
1. Remove the cover in accordance with the procedures in paragraph 3.1.1.
2. Remove the 4 screws that secure the Transducer (8) to the Base (10). The screws are
accessible at the bottom of the balance. See Figure 3-4.
TRANSDUCER
MOUNTING SCREWS
BLK
10 BASE
RED
TRANSDUCER
8 TRANSDUCER
CONNECTOR J6
MOUNTING
SCREWS
J2
C4
J6
LCD DISPLAY
J11
U7
U9
CAL
U8
Figure 3-4. Transducer Removal.
3. Disconnect Connector J6 coming from Transducer (8).
4. Install the replacement Transducer using the 4 screws previously removed and connect the
Transducer flexible cable to connector J6 on the Printed Circuit Board.
5. Reassemble the balance.
6. See Appendix A Service Tools Instructions and load temperature compensation data.
7. Recalibrate the balance in accordance with instructions in Appendix B, Factory Calibration
B.2
8. Check the performance of the balance.
3-4
Page 19
CHAPTER 4 TESTING
4.1 TESTING
Before servicing the balance, an operational test and various performance tests should be made to
ascertain whether or not the balance meets specifications. Turn the balance on and allow it warm up
for at least five minutes before performing these tests. Make sure the test area is free from drafts and
that the balance rests on a level and vibration free surface. The masses used for final calibration must
be adjusted to ASTM Class 4 tolerance or better.
4.1.1 Operational Test
1. Connect a functioning AC Adapter to the balance Power Jack located at
the rear of the balance.
2. Plug the AC Adapter into a suitable power source. If the AC Adapter supplied
with the balance is rated for a different voltage, use an appropriate adapter to match the
supply voltage.
4.1.2 Segment Display Test
1. Turn the balance on by pressing ON/ZERO Off, all segments are enabled and displayed
briefly, then followed by a software revision number. See Figure 4-1 for full display.
2. Tare the balance. The display should indicate a zero weight.
Figure 4-1. LCD Full Display.
4.2 PERFORMANCE TESTS
Accurate performance of a Scout Pro balance is determined by a series of three performance tests. The
displayed readings are compared with the tolerances listed in Table 4-1. Tolerance values are
expressed in counts. A one count change is equal to the last digit shown on the balance display.
TABLE 4-1. TYPES OF PERFORMANCE TESTS
PERFORMANCE TEST TOLERANCE
Repeatability +1 Count
Off Center Load +2 Count
Linearity +1 Count
4-1
Page 20
CHAPTER 4 TESTING
4.2 PERFORMANCE TESTS (CONT.)
The following performance tests are used to evaluate the balance operation before and after repairs.
Each balance tested must meet the requirements specified in each test as well as the specifications
listed in Table 1 - 2 . Toleranc e values ar e expresse d in coun t s. A b a lance whi c h passe s each o f these
three tests meets the manufacturing specifications.
4.2.1 Repeatability Test
Repeatability is a word used in balance specifications meaning the Standard Deviation of a set of
similar weight readings. To determine whether a balance meets the calculated Standard Deviation
value in the Specification Table 1-2, perform the following test:
Test
1. Tare the balance. The reading on the display should be 0g.
2. Select a mass weighing near the maximum capacity of the balance and place the mass on
the center of the Pan (1). Observe and record the reading.
3. Remove the mass. Reading should return to 0g +1 count.
4. Repeat this test for ten readings. If the standard deviation of the readings is less than +1
count, the balance passes the Repeatability Test.
Adjustment
If the deviation for any set of readings (using the same mass placed on the center of the Pan) is greater
than +1 count, the balance does not meet the Repeatability Test specification. Inspect and correct the
following areas:
1. Check for mechanical obstructions. Any foreign object touching any part of the moving Pan
can cause a balance to fail the Repeatability Test. Inspect and correct as necessary.
2. An error in the Off-Center Load Test can affect the results of the Repeatability Test. Inspect
and correct if necessary. See Off-Center Load Test.
3. Foreign material or debris located in the balance between the Pan (1) and the Top Cover
(6) can cause the balance to fail the test.
4. Environmental influences such as vibrations, drafts or a non-level surface can also cause
failures.
5. If the balance fails the test, refer to table 2-1 Diagnostic Guide for assistance.
4-2
Page 21
CHAPTER 4 TESTING
4.2.2 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 (6).
Test
1. Place 1/2 of the balance capacity in the center of the Pan (1).
2. Note the reading.
3. Move the mass halfway (between the center and the edge) to the front of the Pan (1). Note
any differences in the displayed weight reading.
4. Repeat this test for the back, left, and right positions of the Pan.
5. Maximum allowable change in displayed weight readings is
positions. If this reading is exceeded, it usually indicates a defective Transducer (8).
4.2.3 Linearity Test
This test is used to determine the linearity of the unit throughout its operating range. The masses used
to perform this test
Test
Loads do not have to be test weights. They can be anything that totals the load value. The test mass
can be anything that weighs near the test mass value
Capacity Test mass Load 1 Load 2 Load 3 Load 4
200g 1g 50g 100g 150g 190g
400g x 0.01 1g 100g 200g 300g 390g
400g x 0.1 5g 100g 200g 300g 400g
600g 5g 150g 300g 450g 600g
2000g 5g 500g 1000g 1500g 2000g
4000g 5g 1000g 2000g 3000g 4000g
6000g 10g 1500g 3000g 4500g 6000g
must be adjusted to ASTM Class 4 Tolerance, or better.
NOTE:
The balance must pass the Off-Center Load Test and Repeatability Test before the Linearity Test may be performed.
TABLE 4-2. TEST MASSES
+ 2 count for each of the four
1. Place the test mass on the balance, record the weight and then remove.
2. Place Load 1 on the balance and press the ON/ZERO/Off button.
3. Place the test mass on the balance, record the weight and then remove.
4. Place Load 2 on the balance and press the ON/ZERO/Off button.
4-3
Page 22
CHAPTER 4 TESTING
4.2.3 Linearity Test (Cont.)
Test (Cont.)
5. Place the test mass on the balance, record the weight and then remove.
6. Place Load 3 on the balance and press the ON/ZERO/Off button.
7. Place the test mass on the balance, record the weight and then remove.
8. Place Load 4 on the balance and press the ON/ZERO/Off button.
9. Place the test mass on the balance, record the weight and then remove.
10. The difference in the weights of the test mass should be within the tolerance in table 4.1.
If not, perform a linearity calibration, see Appendix B and do the test again.
.
4.3 Down Stop Adjustment
When the balance fails the Off-Center Load test and or the Linearity test, the Transducer may require
checking and adjusting of the down stop. To make adjustments, the Transducer must be removed from
the balance. Perform procedures 3.1.1 and 3.1.3 and remove the Transducer from the balance.
NOTE: This procedure will require feeler gauges ranging from 0.40mm/0.16in. to 0.65mm/0.026in.
Checking and adjusting the down stop.
1. Place masses equaling mass 1 as indicated in Table 4-3 on the platform. You should still
be able to feel some movement with a slight downward push.
2. Place masses equaling mass 2 as indicated in Table 4-3 on the platform. You should feel
no movement with a slight downward push.
3. If the above conditions are not met , adjust the screws on the base plate using the data in
Table 4-4. See Figure 4-2 for location of adjustment screws.
CLEARANCE
CLEARANCE
DOWN STOP
ADJUSTING SCREW
DOWN STOP
ADJUSTING SCREW
Figure 4-2. Transducer Front View - Down Stop Adjustment Screws
4-4
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4.3 Down Stop Adjustment (Cont.)
TABLE 4-3. TEST MASS VALUES
Model Mass 1 Mass 2
SPx202 250 350
SPx402 500 700
SPx401 500 900
SPx601 700 900
SPx2001 3000 7000
SPx4001 5000 7000
SPx6000 7000 9000
TABLE 4-4. TRANSDUCER ADJUSTMENT TOLERANCES
Model Min(mm/in) Max(mm/in)
SPx123 0.40/0.016 0.45/0/018
SPx202 0.60/0.024 0.70/0.028
SPx402 0.50/0/020 0.60/0.024
SPx401 0.75/0.030 0.90/0.035
SPx601 0.65/0.026 0.75/0.030
SPx2001 0.65/0.026 0.90/0.035
SPx4001 0.60/0.024 0.70/0.028
SPx6000 0.50/0/020 0.60/0.024
CHAPTER 4 TESTING
After the transducer has been adjusted, assemble the balance retest and recalibrate.
4-5
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CHAPTER 4 TESTING
4-6
Page 25
CHAPTER 5 DRAWINGS AND PARTS LISTS
5.1 DRAWINGS
This section of the manual contains an exploded view and parts lists. The exploded view drawing is
designed to identify the parts which can be serviced on the balance in the field.
NOTE:
In all cases where a part is replaced, the balance must be
thoroughly checked after the replacement is made. The
balance MUST meet the parameters of all applicable
specifications in this manual.
If further technical information is needed, in the United States call Ohaus Aftermarket toll-free 1-800526-0659 between 8.00 a.m. and 4.00 p.m. EST. An Ohaus factory service technician will be available
to provide assistance. Outside the U.S.A., please contact:
Ohaus Corporation
19 Chapin Road
Pine Brook, NJ 07058, USA
www.ohaus.com
Tel: (973) 377-9000,
Fax: (973) 593-0359
5-1
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Page 27
CHAPTER 5 DRAWINGS AND PARTS LISTS
5.2 PARTS LISTS
This section of the manual contains the replaceable parts for the Scout Pro Balances.
TABLE 5-1. REPLACEMENT PARTS LIST
KEY NO. PART NO. DESCRIPTION
1 71160314 Square Pan, 6.5" x 5.5" SS, Scout Pro, SPx01, SPxx01, SPxx00,
SPXx01, SPXxx01, SPXxx00
2 71160308 Pan Support, 6.5" x 5.5" Square, Scout Pro, SPx01, SPxx01, SPxx00,
SPXx01, SPXxx01, SPXxx00
3 71154611 Round pan Assy, 4.7" (120mm) dia. SS, Scout Pro, SPx02, SPXx02
4 71147378 Specific Gravity Kit, Scout Pro, SPExxx
5 71160395 Function Label, Scout Pro, SPExxx
5 71160346 Function Label, Scout Pro, All but SPExxx
6 71160302 Top Cover, Scout Pro, All
7 71160347 Wire Assembly, Power, Scout Pro, All
8 71160477 Kit, Transducer replacement, 2000g, Scout Pro, SP2001, SPX2001
8 71160408 Kit, Transducer replacement, 6000g, Scout Pro, SP6001, SPX6001
8 71160407 Kit, Transducer replacement, 4000g, Scout Pro, SP4001, SPX4001
8 71160406 Kit, Transducer replacement, 1200g, Scout Pro
8 71160405 Kit, Transducer replacement, 600g, Scout Pro, SPx01, SPXx01
8 71160404 Kit, Transducer replacement, 400g, Scout Pro, SP402, SPX402
8 71160403 Kit, Transducer replacement, 200g, Scout Pro, SP202, SPX202
8 71160402 Kit, Transducer replacement, 120g, Scout Pro, SP123, SPX123
9 71160411 Kit, PCB w/LCD replacement, Full Bridge Hi, Scout Pro, For 120g,
400g, 4000g, SP123, SPX123, SP402, SPX402, SP401, SPX401
9 71160410 Kit, PCB w/LCD replacement, Half Bridge, Scout Pro, For 600g,
6000g, SPx01, SPXx01, SP6000, SPX6000
9 71160409 Kit, PCB w/LCD replacement, Full Bridge Lo, Scout Pro, For 200g,
1200g, 2000g, SP202, SPX202, JS1200, SP2001, SPX2001
5-3
Page 28
CHAPTER 5 DRAWINGS AND PARTS LISTS
TABLE 5-1. REPLACEMENT PARTS LIST (Cont.)
10 71164070 Base w/threaded inserts, Scout Pro, SPGxxx, SPSxxx, SPxxxN
10 71160301 Base, Scout Pro, All with fixed feet
11 71160412 Adjustable feet, with rubber pad, Scout Pro, SPGxxx, SPSxxx, SPxxxN
11 71160305 Foot, Non adjustable, Scout Pro, All
12 71160303 Battery cover, Scout Pro, All
13 71160304 Interface cover, Scout Pro, All
14 71147994 LCD, Scout Pro, All
15 71160313 Cal Lock, Scout Pro, All
16 71160323 Connector, Battery, Scout Pro, All
17 12102033 Weigh Below cover, Scout Pro, All
18 71160309 Lock, sub platform, Scout Pro, All
19 71160413 Level, Scout Pro, SPGxxx, SPSxxx, SPxxxN
20 71160311 LCD support (Left), Scout Pro, All
21 71160312 LCD support (Right), Scout Pro, All
12102323 Adapter, 230V/AU, Scout Pro, All
12102322 Adapter, 240V/UK, Scout Pro, All
12102321 Adapter, 230V/EU, Scout Pro, All
12102320 Adapter, 100-120V/US, Scout Pro All
5-4
Page 29
APPENDIX A SERVICE TOOL INSTRUCTIONS
A. SERVICE TOOLS INSTRUCTIONS
This tool is required when either a main PC board or a transducer is replaced in a Scout Pro balance.
It is used to re-configure the balance to its old parameters in the case of a board replacement or new
parameters in the case of a transducer replacement.
A.1 REQUIREMENTS FOR SCOUT PRO TOOLS
VGA 640x480 or higher resolution screen
Microsoft Windows NT 4.0 or later, or Microsoft Windows 98 or later
Scout Pro RS232 Interface Kit or USB interface Kit
Scout Pro instruction manual
Scout Pro Tools.zip
A.2 SOFTWARE INSTALLATION
1. If you need the software it can be downloaded at the following URL. HTTP://
fileshare.ohaus.com/docushare/.
a. Click on Login.
b. Login = ServiceA
Password = aservice
Both are case sensitive
c. Click on the Xerox logo at the upper left.
d. Click on Technical Support.
e. Click on Service Notes.
f. Click on Authorized Service Centers.
g. Click on Scout Pro Tools.
h. Download all 3 files.
2. Create a folder in the C:\ drive and name it ScoutPro. If you choose another directory you
will have to open the file toledo.ini and modify the path to the service.txt file to agree with
the folder name and path you have chosen.
3. Copy the file ScoutPro Tools.zip into C:\ScoutPro.
4. Extract the files in ScoutPro Tools.zip into C:\ScoutPro.
5. Copy the file service.txt into the C:\ScoutPro, if required.
6. You may want to put a shortcut on your desktop for easier access.
A-1
Page 30
APPENDIX A SERVICE TOOL INSTRUCTIONS
A.3 HARDWARE INSTALLATION
NOTE: The optional interface must be modified so that the EEPROM may be written to.
1. Remove the screw and the housing as shown in
Figure A-1.
2. Locate J3 on the interface board. See Figure A-2.
Figure A-1. Screw and Housing Removal.
Figure A-2. Connector J3 Location.
3. Short the two pins of J3, see Figure A-3.
4. Replace the interface housing.
5. Install the modified RS232 / USB module in
the balance being repaired.
NOTE: If using the customers interface, do not
forget to remove the modification after the
repair is complete.
6. Plug the interface cable into the PC.
Figure A-3. Connector J3 Shorted.
7. Make sure the communications parameters match. The parameters in the tools are:
Baud = 2400
Parity = 7-None
Handshake = None
8. Make sure the balance A-off feature, under the .S.E.T.U.P. menu, is set to OFF, if this
setting is left ON, the balance will shut off during the re-configuration.
A-2
Page 31
APPENDIX A SERVICE TOOL INSTRUCTIONS
A.4 SPECIAL INSTRUCTIONS FOR USB INTERFACE
After installing the interface using the instructions that come with the kit, the COM port will have to be
changed. The interface uses COM 5 as a default. Config Tool only recognizes COM 1 to COM 4.
1. Enter the Windows Control Panel and click on the System Icon.
2. Click on the Hardware tab.
3. Click on the Device Manager button.
4. Expand Ports (COM & LPT).
5 Right Click on USB Serial Port (COM5) and choose Properties.
6. Click on the Port Settings tab.
7. Click on the Advanced button.
8. Change the COM port number to an unused port.
9. Click on OK twice.
9. Close the System Properties box.
10. Close the Control Panel Window.
11. The virtual port will now be the com port you selected.
A.5 USING CONFIGTOOL.EXE.
1. Open ConfigTool.exe, you will see the screen shown in Figure A-4 after the communications parameters have been checked. If the communications parameters are not matched,
or, there is no balance connected, error messages will appear. If a balance is connected,
it will be read automatically and the data will appear.
Figure A-4.
A-3
Page 32
APPENDIX A SERVICE TOOL INSTRUCTIONS
A.5 USING CONFIGTOOL.EXE. (CONT.)
2. If the communications parameters have to be set, click on the Com Port tab and the screen
shown in Figure A-5 will appear. Adjust the parameters as required to match the balance.
Figure A-5.
3. When the communications parameters are matched click on the Test Command tab and
test the communications.
4. In this example, see figure A-6, the P command resulted in the 0.02g b eing written in the
lower screen. The V command resulted in Sr: 1.10 being written. The T command had
the effect of zeroing the balance, and the last P command resulted in the 0.00g being
written. If the balance does not reliably communicate the problem must be fixed before
continuing.
Figure A-6.
A-4
Page 33
APPENDIX A SERVICE TOOL INSTRUCTIONS
A.5 USING CONFIGTOOL.EXE. (CONT.)
5. When communications are reliable return to the Config tab. Press the read button (A) and
the data will be read from the balance. See Figure A-7.
B
6. If the PC Board has been replaced, refer to A.6.
7. If the load cell was replaced, follow the same procedure as above except enter the load
cell serial number and click on Load cell (C) in the serial number box.
8. The bar (G) is a graphical indication of the portion of the transducer output that is being
used.
A.6 USING CONFIG TOOL AFTER REPLACING THE MAIN PC BOARD
1. Using ConfigTool after a new Main PC board has been installed, make sure the balance
lockout switch is in the unlocked position.
2. Install an RS232 option with the factory jumper (J2 on the RS232 option) in the balance.
3. The AC adapter must be used
4. Turn the balance on.
CDE
Figure A-7.
A
FG
A-5
Page 34
APPENDIX A SERVICE TOOL INSTRUCTIONS
A.6 USING CONFIG TOOL AFTER REPLACING THE MAIN PC BOARD (CONT.)
5. The balance displays Err 9.
6. Start the ConfigTool software, see A.5
7. An error message will be displayed User Enable Units & User Variable Check Sum
Verify Error, click on OK.
8. Set RS232 to the correct com port, Baudrate = 2400, ByteSize = 7, Parity = None.
9. The balance will respond to the V command but not the others.
10. The bar graph will respond to pressure on the platform.
11. Enter the balance serial number.
12. Click on OK.
13. Click on READ.
14. The balance should read the correct model and serial number.
15. Perform the factory calibration. See B.2
16. The unit is finished. Remove the RS232 option or the jumper on the customers RS232
option.
A-6
Page 35
APPENDIX B FACTORY CALIBRATIONS
B. FACTORY LINEARITY CALIBRATIONS
The Scout Pro service and factory linearity calibrations use three calibration points; zero, mid-scale
and full scale.
B.1 SERVICE CALIBRATION
This calibration is used when an error 2 has been displayed by the balance. The calibration is
performed with no error checking and is saved as a user calibration. It is not a factory calibration
because no data is written to the EEPROM.
1. Start with the unit off.
2. Press and hold both the ON/ZERO Off and the PRINT Unit buttons until the display reads
rAMP.
3. Press and release the PRINT Unit button. The display will show Lin.
4. Press and release the On/Zero Off button. The display will show -C- blinking and then the
first mass value.
5. Place masses totaling this value on the balance and press the On/Zero Off button.
6. Press and release the On/Zero Off button. The display will show -C- blinking and then the
second mass value.
7. Place masses totaling this value on the balance and press the On/Zero Off button.
8. Press and release the On/Zero Off button. The display will show -C- blinking and then
donE followed by Lin.
9. Repeatedly press and release the PRINT Unit button until the display shows END.
10. Press and release the On/Zero Off button. The balance will return to the weighing mode.
B.2 FACTORY CALIBRATION
This calibration must be used when either a PC board or a transducer is replaced.
1. Remove power from the balance.
2. Install an RS232 option with the pins shorted. See Appendix A.3. If the RS232 option is
not available, pins 2 and 7 of IC9 may be shorted using a micro alligator clip. See Figure
B-1.
CAUTIONS
1. Be very careful that no other pins are shorted, this could destroy the IC.
2. Do not attempt to solder the jumper.
B-1
Page 36
APPENDIX B FACTORY CALIBRATIONS
B.2 FACTORY CALIBRATION (CONT.)
BLK
RED
PIN 2
PIN 7
IC U9
J6
J2
C4
LCD DISPLAY
CAL
J11
U7
U9
U8
Figure B-1. IC U9 Connections.
3. You may need to use some kind of draft shield since the top cover has to be left off.
4. Apply power to the balance.
5. Start with the unit off.
6. Press and hold both the ON/ZERO Off and the PRINT Unit buttons until the display reads
rAMP.
7. Press and release the PRINT Unit button. The display will show Lin.
8. Press and release the ON/ZERO Off button. The display will show -C- blinking and then
the first mass value.
9. Place masses totaling this value on the balance and press the ON/ZERO Off button.
10. Press and release the ON/ZERO Off button. The display will show -C- blinking and then
the second mass value.
11. Place masses totaling this value on the balance and press the ON/ZERO Off button.
12. Press and release the ON/ZERO Off button. The display will show -C- blinking and then
donE followed by Lin.
B-2
Page 37
B.2 FACTORY CALIBRATION (CONT.)
13. Repeatedly press and release the PRINT Unit button until the display shows END.
14. Press and release the ON/ZERO Off button. The balance will return to the weighing mode.
15. Press and hold the ON/ZERO Off button until the display shows OFF.
16. Remove power from the balance
17. Remove either the short on U9 or the short on the RS232 option.
18. Replace the cover.
APPENDIX B FACTORY CALIBRATIONS
B-3
Page 38
APPENDIX B FACTORY CALIBRATIONS
B-4
Page 39
Page 40
*80250973*
P/N 80250973 SERVICE MANUAL SCOUT PRO ELECTRONIC BALANCES
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