Product Service Manual - American Weigh Scales Inc
Contents
1. 1 Top view of Load Cell Side view of Load Cell Weighing Pan s center with points A indicated Figure 4 1 Scale drawing of Catapult 1000 Load Cell and Weighing Pan 4 Place the test weight in the center of the Weighing Pan 5 Tare the balance 6 Move the weight to point A and record the reading 7 Move the weight to point B and record the reading 8 Move the weight to point C and record the reading 9 Move the weight to point D and record the reading 10 If the reading at point A is negative file at points 1 and 4 AT AN ANGLE 11 the reading at point B is negative file at points 1 and 2 STRAIGHT ACROSS 12 If the reading at point C is negative file at points 2 and 3 AT AN ANGLE 13 If the reading at point D is negative file at points 3 and 4 STRAIGHT ACROSS 14 Repeat 1 to 10 until within specifications Note It is not recommended that you try to adjust more than 5 counts if the beam has been filed already If the beam has not been filed previously you can adjust 10 counts Remember when filing you are weakening the beam File a little at a time Catapult 1000 Scales Service Manual 4 5 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 4 8 Linearity Test This test is used to determine the linearity of the unit throughout its operating range The masses used to perform this test can be utility masses NOTE The scale must pass the Repeatability and Off Center Load tests and be cali2. See Chapter 4 4 Measure incoming power from the AC Adapter Connector See Figure 2 2 It should read between 9 and 14 volts dc with power off and above 9 Volts dc with power on 5 Perform simulator testing 2 5 2 Simulator Testing To perform these tests the use of a Simulator is required The function of a Simulator is to simulate the output of a full bridge Load Cell allowing the scale to be separated from the Load Cell for the purposes of troubleshooting and calibration 2 5 3 General Load Test This test checks the Main PC Board circuitry by simulating accurate Load Cell voltages at zero load 50 and 100 load capacities 1 Disconnect power from the scale and remove the PCB Cover Also remove the batteries if any 2 Disconnect the Load Cell cable from the PC Board 3 With the Simulator set to zero attach it to the PCB using the Load Cell Cable solder points on the PCB See Figure 2 1 4 Connect a known good AC Adapter to the scale and connect to a power source 5 Turnonthe scale An under load error may appear This is normal 6 Set the scale to indicate weight in kilograms kg and set the calibration value to maximum span value 7 Adjust the Simulator to simulate 0 load 50 load and 100 load for the capacity that the unit is rated for See Table 2 3 for values to use If the resulting readings are unstable the Main PC Board is defective 8 Use the Simulator to calibrate the scale in the next
3. 2 OHAUS SERVICE MANUAL Catapult 1000 Scales Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 973 377 9000 9 OHAUS SERVICE MANUAL Catapult 1000 Scales 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 2008 Ohaus Corporation all rights reserved TM Registered trademark of Ohaus Corporation TABLE OF CONTENTS Page No CHAPTER 1 GETTING STARTED ES ett dee e 1 1 t2 FACES E 1 1 3 Tools and Test Equipment Required u022420020000200nonnnno nennen nnne nenn nenne nennen 1 2 EC 0 ee een 1 2 1 5 01 gt EE 1 3 Lod Ge EE Ee el acu sanceeenaccatctsancnnnacenncnceseastedantanantasenensoiawseesesneneuesaeusminesarcednerenannsds 3 192 OVNEN OF CONTO ee ee 1 3 1 33 E E 1 4 E Dynamic 1 4 soe O71 0 0 0 008087 38383 1 5 CHAPTER 2 TROUBLESHOOTING 7 2 1 2A Visual IIS DC COM eege ee 2 1 2 gt 3 Diagnose 0 6 gt a ee ee 2 2 2 321 2 2 2 4 Checking the Load Cell s Gong 2 4 2l elei e et 2 4 2 4 2 Resistance Test 2 5 2 5 Testing the Printed Circuit Board DCH 2 6 2 5 1 PCB Volta
4. With the scale connected to an appropriate power supply press ON ZERO OFF The scale performs a self test indicates the software revision and then goes into weighing mode 4 If all of the displays appear normal in this test continue with the next test If the display did not appear check the AC adapter output and repeat the test with a good adapter the display was erratic the PC board is defective and requires replacement 4 3 Performance Tests Using a Load Cell Simulator Connect the simulator s leads to the PCB See Figure 2 2 and Table 2 2 page 2 4 Test the Scale as follows 1 Set the simulator to zero Power on the scale Perform a Span Calibration with zero at the simulator s zero setting and 100 capacity at the simulator s millivolt setting in Table 2 3 page 2 5 2 Following calibration check that the scale s display reading is stable at each simulator level up to the maximum set in the calibration If the readings are stable the Scale is functioning properly 4 4 Calibration Retention Test This test checks that the scale retains calibration after power is removed and then restored 1 Turn the Scale OFF and disconnect the AC Adapter 2 Wait one minute then reconnect the AC Adapter to the scale 3 Check to insure that the Scale retained calibration settings Catapult 1000 Scales Service Manual 4 1 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 4 5 Repeatability Test Repeatability
5. procedure Catapult 1000 Scales Service Manual 2 5 Ohaus Corporation www ohaus com CHAPTER 2 TROUBLESHOOTING 2 5 Testing the Printed Circuit Board PCB 2 5 4 Calibration Test This test calibrates the scale using the simulator and can verify that the Main PC Board is functioning properly or improperly 1 With the scale on press and hold UNITS Calto perform a calibration See Section 1 8 2 Follow the scale prompts When the scale indicates a given weight to be placed on the scale set the simulator to an equivalent value based on Table 2 3 3 Upon completion of calibration the PCB can be further checked using the Simulator to simulate various weight values If simulator settings and weight readings on the scale agree the PCB is functional If the scale readings vary or do not agree with readings in Table 2 3 the Main PC Board is defective and should be replaced See Chapter 3 Ohaus Corporation www ohaus com 2 6 Catapult 1000 Scales Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 1 PREVENTIVE MAINTENANCE Ohaus scales should be carefully handled stored in a clean dry 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 Allow time for the scale to stabilize after moving it from an area which is at a different temperature than the area
6. Calibration Error Stop calibration and try again after checking for correct weight Unstable at Power on Be sure environment is stable and scale is resting on a flat surface Check adjustable feet EEPROM read error Replace PCB Di pay Lob Low battery shutdown Replace batteries Display Lo Low line voltage shutdown If input voltage is unstable switch to nee power adapter problem battery operation Ohaus Corporation www ohaus com 2 2 Catapult 1000 Scales Service Manual CHAPTER 2 TROUBLESHOOTING 2 4 CHECKING THE LOAD CELL S SIGNAL Remove the PCB Cover to gain access to the PCB and wiring 2 4 1 Output Voltage Test Measure the no load 50 load and full load output The reading should meet the Load Cell specifications The Load Cell output should be very close to linear over its capacity range NOTE The following steps involve power applied to the scale Load Cell solder contacts can be used as measuring points See Figure 2 2 1 BOTTOM VIEW OF PCB CAL LOCK Power Supply amp Battery Connector Figure 2 2 Catapult 1000 PCB connections AN The EXE and EXE wires should be connected to the PCB and the SIG and SIG wires must be disconnected Record the colors for each wire connection before disconnecting See Table 2 2 for typical color code for SD Series TABLE 2 2 COLOR CODE FOR LOAD CELL WIRING WHITE GREEN YELLOW RED Color codes may vary 1 Pow
7. T OF ILLUSTRATIONS TITLE GatapulE T000 DISPLAY orenen A Visual Checking 0 7 Ee Load Cell Junction Board Power Cable and Load Cell leads soldered to the Printed Circuit Board Open Battery Compartment door by pressing the two inset latch levers Scale drawing of Catapult 1000 Load Cell and Weighing Pan Catapult 1000 5630 Parts nn an see le TABLE NO 1 1 31 2 2 2 3 2 4 4 1 4 2 5 1 FIGURE NO 1 1 2 1 Catapult 1000 Scales Service Manual 2 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 1 INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus Catapult 1000 Scales The contents of this manual are contained in five chapters Chapter 1 Getting Started Contains information regarding service facilities tools and test equipment measuring masses specifications and the mechanical and electronic functions of the scale Chapter 2 Troubleshooting Contains a diagnosis diagnostics chart and error code table Chapter 3 Maintenance Procedures Contains preventive maintenance procedures and disassembly repair and replacement procedures Chapter 4 Testing Contains an operational test segment display test performance tests and adjustments Chapter 5 Drawings and Parts Lists Contains exploded views of Catapult 1000 Scales identifying all serviceable components Before servicing
8. and use care when handling components of the scale 2 2 VISUAL INSPECTION Carefully remove the scale from its packing container and remove any packing material Note all items supplied with the unit such as AC power supply cables instruction manual weights etc Keep a record of all items and note their condition 1 Examine the scale for signs of abuse such as a cracked housing damage from liquids cracks on corners which may suggest the unit was dropped 2 Open the scale by removing the two screws in the bottom housing 3 Examine the top of the Main PCB and Load Cell Junction Board for cracks or signs of corrosion 4 If it appears that corrosion may have affected the boards and you want to examine the bottom of either of them remove the screw s holding to the housing 5 If either PCB is cracked or shows signs of corrosion it requires replacement See Chapter 3 Maintenance Procedures If the Load Cell Junction Board is bad replace the scale If the scale shows no sign of physical damage continue with procedures 2 3 DIAGNOSTIC GUIDE Table 2 1 is a Diagnostic Guide designed to help locate the problem area quickly and easily The probable causes are listed with the most common cause first If the first remedy does not fix the problem proceed to the next remedy Before attempting any repairs read all chapters of this manual to be familiar with overall operation and all components 2 3 1 Diagnosis 1 Isolate and
9. brated before the Linearity Test may be performed TABLE 4 2 LINEARITY TEST MASSES Capacity amp Readability C11P9 C11P20 C11P75 4kg 10 Ib 10 kg 22 Ib 40 kg 100 Ib 7 kg 15 15 kg 34 Ib 60 kg 150 Ib NOTE All masses are nominal values Be certain to use the same reference mass throughout the procedure Place the reference mass on the Scale record the weight and remove Place Load 1 on the Scale and press ON ZERO Off Place the reference mass on the Scale record the weight and remove Place Load 2 on the Scale and press ON ZERO Off Place the reference mass on the Scale record the weight and remove Place Load 3 on the Scale and press ON ZERO Off Place the reference mass on the Scale and record the weight oe et OY ge ee IS 2 The difference in the weights of the test mass should be within the tolerance in the relevant Specification Table in Chapter 1 If not calibrate see Section 1 8 and repeat the test 9 Ifthe Scale remains out of tolerance the base may need to be replaced Ohaus Corporation www ohaus com 4 6 Catapult 1000 Scales Service Manual CHAPTER 5 PARTS LISTS 8 DIAGRAMS This section of the manual contains exploded views for the Catapult 1000 Scales The exploded view drawings are designed to identify the parts which can be serviced in the field NOTE In all cases where a part is replaced the scale must be thoroughly checked after the replacement is made The scale MUST
10. cord in worksheet 8 Add the ten Delta x Delta values and divide by 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 move it to a suitable location ensure that it is level and try again If it still does not meet specifications replace the base Catapult 1000 Scales Service Manual 4 3 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 4 6 Off Center Load Test The Off Center Load Test is used to determine whether displayed weight values are affected by moving the sample to different areas of the Pan 1 Place half of the scale s capacity in the center of the Pan 2 Note the reading 3 Move the mass halfway between the center and the edge to the front of the Pan Note any differences in the displayed weight reading 4 Repeat the test for the back left and right position of the Pan 5 Maximum allowable change in displayed weight readings for each of the four positions can be found in Table 1 1 Specifications page 1 2 If this maximum is exceeded it will be necessary to adjust one or more of the Load Cells See next section Figure 4 1 Off Center Load Test weighing points Ohaus Corporation www ohaus com 4 4 Catapult 1000 Scales Service Manual CHAPTER 4 TESTING 4 7 Adjusting Off Center Load on Strain Gauge Load Cells the Off Center Load OCL is excessive perform adjustment as follows
11. densing Static over load limit load cell 150 capacity Power AC Adapter 9V DC 100mA 3 C LR14 alkaline batteries not included Battery Operating Time 300 hours Auto Shutoff 4 minutes with no activity battery operation only Ohaus Corporation www ohaus com 1 2 Catapult 1000 Scales Service Manual CHAPTER 1 GETTING STARTED 1 5 OPERATION This section contains information on the basic operation of the Catapult 1000 Scale Exploded view drawings in Chapter 5 identify all components 1 5 1 Power Supply Power to the scale is supplied by a 9 V dc 100mA Power Adapter or by 3 C size LR 14 alkaline batteries The batteries allow the unit to run for 300 hours When both the line voltage and battery are present the scale will take power from line voltage When line voltage is lost the scale will automatically switch over to battery operation The unit will power off after four minutes of inactivity when running on battery Battery indicator is on when battery is in use Low Battery Flashing battery symbol indicates a low battery condition When first displayed approximately 12 hours of operation remain When the battery is fully depleted the scale momentarily displays Lo bAt and shuts off 1 5 2 OVERVIEW OF THE CONTROLS Battery Indicator Sec Hagop Control Buttons 4 digit LCD display Figure 1 1 Catapult 1000 Display ON ZERO Off key A short pr
12. e of scale instability or because the scale does not calibrate or repeat or because it is physically broken or displays an error code Screws securing Follow these steps to replace the Load Cells Weighing Pan 1 Unplug the power adapter and or ma 2 e remove the batteries Screws securing 2 Remove the two screws that secure Load Cells o gt the Weighing Pan and lift it off GE 3 Unsolder the Load Cell Cable s leads from the Load Cell Junction s Board See Figure 3 2 Figure 3 1 Scale Bottom 4 Remove the two screws that secure each Load Cell using a 3mm Allen key Hold each Load Cell by hand while removing the screws 5 Lift out the Load Cells and replace each one See Figure 5 1 6 Place the square bushings on both sides of the Bottom Housing then insert the screws Hold each Load Cell to stabilize it while installing it 7 Solder the new Load Cells cable leads to the Load Cell Junction Board 8 Reinstall the Weighing Pan 9 Calibrate the scale See Section 1 6 10 Perform all tests See Chapter 4 Figure 3 3 Installing a Load Cell Ohaus Corporation www ohaus com 3 2 Catapult 1000 Scales Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 2 2 Printed Circuit Board PCB Replacement Replace the Printed Circuit Board PCB for any of the following reasons Display is defective characters missing or partial display Scale fails to calibrate pro
13. el Replacement Unplug the AC Adapter Lift the Function Label off from the Top Housing Remove the old Display Window The Function Label is held in place with a strong adhesive Clean the Top Cover and remove all traces of adhesive CAUTION Be careful placing the Function Label into position as the adhesive will not allow repositioning once attached to the cover Put the new Display Window in place Remove the protective backing from the back of the new Function Label and carefully position it on the Top Housing starting at the bottom of the Housing Use a rolling motion to smooth the Function Label into position 1 2 Ohaus Corporation www ohaus com 3 4 Catapult 1000 Scales Service Manual CHAPTER 4 TESTING 4 1 TESTING Before and after servicing the scale operational and performance tests should be made to determine if meets specifications Turn the scale ON and allow warm up for at least 0 minutes before performing these checks The masses used for calibration should be ASTM Class F or OIML Class M1 tolerance or better NOTE bg Make sure the test area Is free from drafts and that the scale rests a level and vibration free surface 4 2 Power Test The purpose of this test is to determine if the electronic circuitry of the scale is functioning properly or not 1 Connect a functioning AC Adapter to the scale s power plug 2 Plug the AC Adapter into a suitable power source 3
14. er on the scale with AC Adapter 2 Using a voltmeter with no load on the Platform measure the voltage across points 1 and 4 of Load Cell connection on the PCB EXE and EXE This voltage must be approximately 3 0 Volts dc If the voltage is lower disconnect the Load Cell cable from the PCB and measure again If the voltage is 3 Volts dc the Load Cell is defective and must be replaced If the voltage remains low the PCB is defective and must be replaced CAUTION bg IN THE NEXT STEP DO NOT OVERLOAD THE SCALE BEYOND FULL CAPACITY RATING Catapult 1000 Scales Service Manual 2 3 Ohaus Corporation www ohaus com CHAPTER 2 TROUBLESHOOTING 2 4 1 Output Voltage Test 3 Measure the voltages on SIG and SIG wires disconnected from PCB Note Measurements must be made with these wires disconnected from the PCB These measurements represent the output of the Load Cell Record measurements at Zero Load 50 and full scale capacities See Table 2 3 for typical readings NOTE Table 2 3 indicates typical readings Actual values can vary but should remain linear throughout the range If readings are out of tolerance replace the base TABLE 2 3 LOAD CELL OUTPUT READINGS in mV with 3 Excitation Model Capacity 50 Load 100 Load 2 4 2 Resistance Test Perform a Resistance Test to determine if the Load Cell is severely damaged or a short circuit has occurred Note The Load Cell must be comp
15. ess turns on the scale when it is off When the scale on a short press zeroes the scale and a long press turns the scale off UNITS Cal key A short press changes the weighing unit and weighing mode In Dynamic Weighing Mode a short press initiates countdown after mass is placed on scale and A appears while is blinking Along press initiates calibration Stability Indicator A 7 appears in the left corner when the reading is stable Weighing Unit The selected weighing unit selected appears on the right Dynamic Weighing Mode A 6 blinks next to the selected weighing unit See Section 1 54 Catapult 1000 Scales Service Manual 1 3 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 5 3 Basic Functions Power Up Test When ON ZERO Off button is pressed the scale turns on all display segments appear followed by the software version The display then resets to zero Zero Function By pressing ON ZERO Off the display returns to zero When adding additional mass press ON ZERO Off repeatedly until the scale s full capacity is reached When using a container ON ZERO Offmay be used to simulate a Tare function Additional mass may then be added as a NET weight When removing both the sample and container from the scale a negative value may appear Zero the scale again before subsequent usage Note Pressing ON ZERO Offwill perform a true zero setting function when displayed values a
16. ge Measurements nennen nennen nnnnnn nennen 2 6 252 zen ee eee 2 6 2 99 CNIS Fest ee ee ee ee 2 6 25 EOS et een 2 7 CHAPTER 3 MAINTENANCE PROCEDURES 31 Preventive Eat e 3 1 3 1 1 Preventive Maintenance Checker 3 1 3 2 Replacement of Major Components nennen nennen 3 1 321 Load ee ee ke 3 2 3 2 2 Printed Circuit Board PCB Replacement nenne nnnnnnenne nenn 3 3 3 2 3 Battery 0 ee 3 4 3 2 4 F netion LabelReblacemenl seen 3 4 CHAPTER 4 TESTING TOSUN EE 4 1 4 2 ee ee ee ne en 4 1 4 3 Performance Tests Using a Scale Base 4 1 4 4 Calibration Retention Test 4 1 4 5 ANE en aan 4 2 46 Oil Center Load Test ee 4 4 4 7 Off Center Load Adjustmernt 0022242000022000000000nn en nnnnnn no nnnnnnnennnnnnnnnnnnnnn nennen nen 4 5 48 4 6 CHAPTER 5 PARTS LISTS amp DIAGRAMS 51 Catapult 1000 Scale EE 5 2 Ohaus Corporation www ohaus com 1 Catapult 1000 Scales Service Manual Catapult 1000 PCB a Installng a Load Geller ee Removing screws that secure the PCB s 200 Hiate TABLE OF CONTENTS LIST OF TABLES TITLE SEI Diagnostic Guide Table scien teense ecient ame Color Code For Load Cell Wiring cccccccccccsseeeeeeseeeeeeseeeeeeeseeeeeeseas Load Cell Output Readings in mV with 3V Excitation eee Load Cell Resistance Readings in 8 0 22 Repeatability Worksheet A ine 6 Scale Pans anne eg LIS
17. identify the symptom 2 Refer to Table 2 1 Diagnostic Guide and locate the symptom 3 Follow the suggested remedies in the order they appear 4 Perform the indicated checks or see the appropriate section of the manual 5 Repair or replace the defective part NOTE lf more than one symptom is observed approach one area at a time and remember that the symptoms may be interrelated lf a problem arises that is not covered in this manual contact Ohaus Corporation for further information Catapult 1000 Scales Service Manual 2 1 Ohaus Corporation www ohaus com CHAPTER 2 TROUBLESHOOTING 2 3 1 Diagnosis TABLE 2 1 DIAGNOSTIC GUIDE TABLE Scale will not turn on No power to scale Verify connections and voltage Battery power used up Connect power and replace batteries Poor accuracy Improper calibration Perform calibration Unstable environment Move scale to suitable location Unable to calibrate Unstable environment Move the scale to suitable location Incorrect calibration mass Use correct calibration mass Display 8 Scale is in Dynamic Weighing Proceed weighing in Dynamic Mode Weighing Mode if desired See Section 1 54 To exit remove the mass from the platform and press UNITS Cal Display 880008 or Load cell cable is disconnected Connect the load cell cable to the or no weight scale a No calibration data in EEPROM Calibrate the scale Display E Remove excess weight from platform Display CAL
18. ion weight on the platform and press 00 2580 Off The display will again show C 5 m 4 7 After span capture the display will return to the normal weighing mode Note The message CAL E will appear if an incorrect calibration weight was applied Repeat the procedure using the correct calibration weight Calibration Locking By use of an internal switch the calibration function may be locked disabled and unauthorized recalibration prevented See Figure 2 2 1 With the scale powered off remove the back cover plate of the display by unscrewing the two screws on the bottom 2 Slide the switch on the PCB marked SW3 to the position marked CAL LOCK 3 Reassemble the housing 4 lf required place tamper evident seals over the screw holes or the housing edges later recalibration is required the housing will need to be reopened and the lock switch returned to the original position Note When the lock switch is set to the CAL LOCK position the power on zero range is reduced to 10 of full capacity Catapult 1000 Scales Service Manual 1 5 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED Ohaus Corporation www ohaus com 1 6 Catapult 1000 Scales Service Manual CHAPTER 2 TROUBLESHOOTING 2 1 INTRODUCTION This section of the manual covers visual inspection troubleshooting and a Diagnostic Guide Table 2 1 Follow all directions step by step Make certain that the work area is clean
19. is the Standard Deviation of a set of similar weight readings Requirements To perform this test a single mass must be used for all readings The test mass should be approximately Le of the capacity of the scale Before starting a repeatability test set up the scale as follows Set Up Enter the menu and set the scale to display the same units as the performance specifications TEST PROCEDURE 1 Zero the scale 2 Using atest mass approximately half the capacity of the scale place the mass on the center of platform Record the reading on the worksheet provided Remove the mass from the platform Repeat this test starting at Step 1 until you record a total of ten readings Fill in the worksheet Table 4 1 with the ten readings Ohaus Corporation www ohaus com 4 2 Catapult 1000 Scales Service Manual CHAPTER 4 TESTING 4 5 Repeatability Test TABLE 4 1 REPEATABILITY WORKSHEET u Delta Reading Mean Delta x Delta n number of Reading Mean Sum of readings 10 Delta Reading Mean Standard Deviation Square Root of sum of Delta x Delta 9 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 Calculate the Delta x Delta for each reading and re
20. letely disconnected from the Printed Circuit Board and at no load when the resistance readings are taken Using an ohm meter measure and record resistance between each pair of wires from the Load Cell as specified in Table 2 2 Compare the measured readings with the specified values in Table 2 4 the resistance readings are in the range specified skip to the next section If they are outside the expected range open circuit or short circuit across any two wires the Load Cell is defective replace the Load Cells as a set TABLE 2 4 LOAD CELL RESISTANCE READINGS in Ohms Modei Exe to Ex S to S Exe to S Exs to S EX to S x10 S Ohaus Corporation www ohaus com 2 4 Catapult 1000 Scales Service Manual CHAPTER 2 TROUBLESHOOTING 2 5 Testing the Printed Circuit Board PCB The PCB can be tested by measuring voltages and by using a simulator The simulator replaces the Load Cell during testing and is a useful tool for diagnosing problems 2 5 1 PCB Voltage Measurements Note Prior to the voltage measurements test and install new batteries 1 Disconnect the power and remove the PCB Cover 2 Connect the AC Adapter to the scale and turn it on 3 Using a DVM measure the excitation voltage EXE and EXE in Figure 2 2 The reading should be 3 volts dc This is the excitation voltage for the Load Cell and is regulated If the voltage is lower replace the PCB See Chapter 3 Then perform Operational Tests
21. meet the parameters of all applicable specifications in this manual further technical information is needed please contact your local Ohaus office or Ohaus Corporation www ohaus com 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 USA Tel 973 377 9000 Fax 973 593 0359 In the United States call toll free 800 526 0659 between 8 00 a m and 6 00 p m EST Catapult 1000 Scales Service Manual 5 1 Ohaus Corporation www ohaus com CHAPTER 5 PARTS LISTS 8 DIAGRAMS 5 1 CATAPULT 1000 SCALE Parts Catapult 1000 Figure 5 1 Catapult 1000 Scale Parts Ohaus Corporation www ohaus com 5 2 Catapult 1000 Scales Service Manual CHAPTER 5 PARTS LISTS 8 DIAGRAMS 5 1 CATAPULT 1000 SCALE Parts TABLE 5 1 CATAPULT 1000 SCALE Parts Pan Stainless Steel Optional 10 Rubber Feet 4 Interchangeable Plug Set UK EU US AU Interchangeable Plug Set UK amp EU Catapult 1000 Scales Service Manual 5 3 Ohaus Corporation www ohaus com CHAPTER 5 PARTSLISTS 8 DIAGRAMS Ohaus Corporation www ohaus com 5 4 Catapult 1000 Scales Service Manual OHRUS x 8 0 2 5 2 2 09 P N 80252209 SERVICE MANUAL CATAPULT 1000 SCALES
22. perly Display is erratic or unstable Scale does not operate at all DERE SS Figure 3 4 Removing screws that secure the PCB Cover 1 Unplug the power Adapter If necessary remove the batteries 2 Remove the two screws holding the PCB Cover and lift it out 3 Unsolder the Load Cell Cable s leads and the Power Cable leads x from the PCB See Figure 3 5 Figure 3 5 Power Cable and Load Cell leads soldered to the Printed Circuit Board 4 Lift out the Main PCB CAUTION AN When handling the PCB grasp it by the edges only Do not touch the foil side Static discharge may damage some components 5 Carefully re position the replacement PCB over the screw holes in the Bottom Housing and re insert and tighten the screws 6 Re solder the cable sets removed in Steps 4 7 Calibrate the scale See Section 1 6 8 Perform all tests See Chapter 4 Catapult 1000 Scales Service Manual 3 3 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES 3 2 3 Battery Replacement To replace the Type C LR14 batteries press the inset latch lever in the middle of the Bottom Housing Note the proper direction for inserting new batteries printed on the inside of the Battery Compartment door indicated close the Battery Compartment door Figure 3 6 Open Battery Compartment door by pressing the two inset latch levers After placing the batteries as 1 3 2 4 Function Lab
23. re within 2 of full capacity Above 2 the range is limited to full capacity by subtraction Negative Values When a load is removed from the scale any previously zeroed value will be displayed as a negative number To return to normal operation press ON ZERO Off to clear the negative value Overload If the applied load exceeds the scale s capacity an E appears Remove the load and the scale will return to normal operation Auto Shut Off During battery operation the scale automatically turns off after approximately four minutes of inactivity to extend battery life 1 5 4 Dynamic Weighing Also known as animal weighing this feature displays an average weight value during a period of several seconds Follow these steps to start and complete a Dynamic Weighing process 1 With the platform empty press UNITS Cal until the indicator 6 flashes next to the desired measuring unit 2 Place a mass on the platform The scale will show A Note If using a container press ON ZERO Off to tare the weight and return to zero 4 With a mass on the platform or container short press UNITS Ca to start the averaging countdown from 5 seconds 5 The averaged weight appears The indicator 6 stops flashing when the process is complete 6 The display will hold until a button is pressed 7 repeat the process press UNITS Calwith a mass on the platform or container 8 To exit remove the mass f
24. rom the platform or container and press UNITS Cal Ohaus Corporation www ohaus com 1 4 Catapult 1000 Scales Service Manual CHAPTER 1 GETTING STARTED 1 6 CALIBRATION For best results calibrate the scale at regular intervals Correct calibration weights must be available before starting calibration See Specification Table Multiple weights may be used to equal the required calibration weight Calibration is unavailable in Dynamic Weighing Mode CAUTION BE CAREFUL HANDLING CALIBRATION WEIGHTS THEY ARE VERY A N HEAVY IMPROPER LIFTING METHODS OR MISUSE OF CALIBRATION WEIGHTS MAY RESULT IN PERSONAL INJURY 1 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 one hour for each 5 F 2 7 C change After temperature stabilization allow an additional 20 minutes after turning the scale on for the scale electronics to stabilize 2 To select the weighing unit to be used press UNITS Cal until the correct unit is displayed then press Yes Note Calibration can be stopped at any time press UNITS Ca or turn the scale off 3 Press and hold UNITS Ca until CAL is displayed Te H LIIL 4 With the platform empty press 00 2580 Offto capture the scale zero The display will show C H rs 0 5 After the zero is captured the required span calibration weight value in the selected unit appears 2 L E 6 Place the calibrat
25. the scale you should be familiar with the Instruction Manual which is packed with every scale 1 2 SERVICE FACILITIES To service a scale the service area should meet the following requirements e Must be protected from electrostatic discharge e Should be temperature controlled and meet the scale specifications for temperature environmental requirements See specifications for temperature range e Must be free of vibrations such as fork lift trucks close by large motors etc e Area must be clean and air must not contain excessive dust particles e Work surface must be stable and level e Work surface must not be exposed to direct sunlight or radiating heat sources Catapult 1000 Scales Service Manual 1 1 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 3 TOOLS AND TEST EQUIPMENT REQUIRED The service shop should contain the following equipment 1 Standard hand tools 2 Digital Voltmeter DVM 3 Load Cell Simulator optional 1 4 SPECIFICATIONS TABLE 1 1 SPECIFICATIONS Specification C11P9 C11P20 C11P75 Capacity x readability d 9 kg x 0 05 75 kg x 0 05 20 Ib x 0 01 44 b x 0 02 165 lb 0 1 Calibration Weights fixed 75 kg 165 Ib Repeatability std Dev Off center load 1 2 cap 12 dist Operating Temperature range 5 C 41 F to 40 C 104 F at 10 to 80 relative humidity non condensing Storage temperature range 10 C 14 F to 60 C 140 F at 10 to 80 relative humidity non con
26. where it is to be operated one hour for each 5 F 2 7 C change After temperature stabilization allow an additional 20 minutes after turning the scale on for the scale electronics to stabilize 3 1 1 Preventive Maintenance Checklist The scale should be inspected and checked regularly as follows 1 Unplug the AC Adapter before cleaning 2 Clean the outside using a damp cloth with warm water CAUTION bg DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE S FINISH 3 Check the Power Cord for broken or damaged insulation 4 Make a visual inspection for faulty connectors wiring and loose hardware 3 2 REPLACEMENT OF MAJOR COMPONENTS The decision to replace any component should only be made after thoroughly diagnosing the problem If after the replacement of any component the scale is still non functional and no other information on the subject is available in the manual contact your local Ohaus office or contact Ohaus Corporation by visiting www ohaus com In the United States call Ohaus Aftermarket toll free 800 526 0659 between 8 00 a m and 4 00 p m EST Catapult 1000 Scales Service Manual 3 1 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES 3 2 1 Replacing Load Cells Repairs are not recommended on the Catapult 1000 scale Some component parts may be replaced Replacement is recommended rather than repairing Load Cells may need to be replaced becaus
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