Ohaus T32MC Technical Manual
Contents
1. 3 6 35 uuu u us PS erates 3 6 3 6 Function Label Replacement 3 7 CHAPTER 4 TESTING SN 6 a 4 1 42 eC 4 1 4 3 Performance Tests Using a Scale 4 240400002000 4 1 4 3 1 Overl ad Underload eie rente sana haqa a na 4 2 4 4 Performance Tests Using a Load Cell Simulator 4 2 4 5 Galibration Retention Test SGS 4 2 46 RS232 Interface Test Print Test 4 2 3000 Series T32ME MC Indicators Service Manual Ohaus Corporation www ohaus com TABLE OF CONTENTS CHAPTER 5 PARTS LISTS amp DIAGRAMS Page No 5 1 3000 Series T32MC LCD Indicator Housing amp Internal Parts 5 2 5 2 3000 Series T32ME LED Indicator Housing amp Internal Parts 5 4 APPENDIX A SETUP amp CALIBRATION VALUES A 1 Prelimindry A 1 AB 9 2 Linearliy CIOL QUO see ET 2 A 4 Setup amp Calibration Values A 3 APPENDIX B GEOGRAPHICAL ADJUSTMENT B 1 Geographical Adjustment B 1 LIST OF TABLES TABLE NO TITLE Page No 1 1 SC Cll CANONS2. ee 1 3 1 2 Functions of Display SONO Senna een 1 6 1 3 132 u uu uu _________ ____ 1 7 1 4 Serial Interface Command Table 1 9 1 5 Default Serial Output 1 9 2 1 iae 2 2 2 2 2 TEE 2 3 5 1 T32MC LCD Indicator Housing amp Internal Parts 5 9 5 2 T32ME LED Indicator Housing amp Internal Parts 5 5 A 1 Setup amp Calibration 2 A 3 B 1 Geographical Adjustment Values B 1 LIST OF ILLUSTRATIONS FIGURE NO TITLE 1 1 FOUN screws OM TEA panel uuu uuu do ava ud 1 4 1 2 Printed Circuit Board PCB T32 Indicator 1 4 1 3 Load u uuu ee 1 4 1 4 OBen sh rted 1 4 1 5 REAL DANG T 1 5 1 6 A202 Pisa nee em 1 5 1 7 TES ZING TIS u uu uuu een 1 6 1 8 T32ME Display 1 6 1 9 T2 VI ISIN 1 10 1 10 192 eis MR uU E 1 10 2 1 Visual GMECKING PFOCEAUFES une een 2 1 3 1
3. 2 OHAUS SERVICE MANUAL 3000 Series T32ME amp T32MC Indicators Ohaus Corporation 7 Campus Drive Suite 310 Parsippany NJ 07054 973 377 9000 OHAUS SERVICE MANUAL 3000 Series T32 Indicators T32ME amp T32MC 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 2011 Ohaus Corporation all rights reserved TM Registered trademark of Ohaus Corporation TABLE OF CONTENTS CHAPTER 1 GETTING STARTED Page No Jo D E ein 1 1 L2 SONICO me 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 TU Ue 1 3 1 5 Hardware Setup or Disassembly see eier 1 4 1 53 11 Jumper GONNECHONS 1 5 1 5 2 19292 MCHA CC x aeg 1 5 1 6 Overview ot the Controls 5 aue 1 6 17 OCT AON 1 7 1 7 1 Power OM estat moror 1 7 i
4. 5 Ib to 100 capacity urn 7 8 x 1 8 x 5 2 198 x 46 x 132 10 C to 40 C 14 F to 104 3000 Series T32ME amp MC Indicator Service Manual 1 3 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 5 HARDWARE SETUP Both the T32ME and T32MC connect to a scale base through a Load Cell Cable that connects to the Indicator s Main Printed Circuit Board PCB When supplied as part of a scale each model has a mounting bracket that attaches to the column bracket of the base scale To remove the mounting bracket remove the threaded knobs holding the Indicator by hand CAUTION N ELECTRICAL SHOCK HAZARD REMOVE ALL POWER CONNECTIONS TO THE INDICATOR BEFORE SERVICING OR MAKING INTERNAL CONNECTIONS Remove the four screws from the rear housing See Figure 1 1 Carefully open the housing Figure 1 2 shows connectors jumpers terminals and switches on the Main PCB The Load Cell Cable connects to Terminal Block J7 Figure 1 1 Four screws on Housing RS232 LFT On Off Power Supply Switch a Input J1 Connector J3 J Sense E Jumper W2 Sens Load Cell ww Terminal Sig 1427 Block J7 GND Sense Sig Jumper W1 Be LETON LILFTOFF Exe Figure 1 2 Printed Circuit Board PCB T32 Indicator Figure 1 3 Load Cell wiring Ohaus Corporation www ohaus com 1 4 3000 T32ME amp MC Indicator Service Manual CHAPTER 1 GETTING STARTED 1 5 1 Jumper Connections For a 4 wire load cell wi
5. 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 3000 Series T32ME MC Indicators Service Manual 5 1 Ohaus Corporation www ohaus com CHAPTER 5 PARTS LISTS amp DIAGRAMS 5 1 3000 SERIES T32MC LCD INDICATOR HOUSING amp INTERNAL PARTS 80 Figure 5 1 Series 3000 T32MC Indicator Housing amp Internal Parts Ohaus Corporation www ohaus com 5 2 3000 Series T32ME amp MC Indicators Service Manual CHAPTER 5 PARTS LISTS amp DIAGRAMS 5 1 3000 SERIES T32MC LCD INDICATOR HOUSING amp INTERNAL PARTS TABLE 5 1 T32MC LCD INDICATOR HOUSING INTERNAL PARTS fonte o Rousing Top sfc tan O w o aperon ow 3000 Series T32ME amp MC Indicators Service Manual 5 3 Ohaus Corporation www ohaus com CHAPTER 5 PARTS LISTS amp DIAGRAMS 5 2 3000 SERIES T32ME INDICATOR HOUSING amp INTERNAL PARTS Figure 5 1 Series 3000 T32ME Indicator Housing amp Internal Parts Ohaus Corporation www ohaus com 5 4 3000 Series T32ME amp MC Indicators Service Man
6. 0005 0 001 0 002 0 001 0 002 0 005 5 2 5 0 005 10 10 0005 0 001 0 002 0 002 0 005 0 01 5 10 5 10 0 005 0 01 0 001 0 002 0 005 0 01 0 005 0 01 5 10 15 20 10 001 0 002 0 005 0 005 0 01 0 02 5 10 15 20 10 20 0 01 0 02 0005 001 008 005 001 002 008 5 10 1520 25 00 40 00 0 m _ 0 005 0 01 0 02 0 05 0 02 0 05 0 1 5 10 15 20 25 30 40 50 60 75 100 50 100 0 1 0 01 0 02 0 05 0 1 0 02 0 05 0 1 5 10 15 20 25 30 40 50 60 75 100 120 60 120 0 01 0 02 0 05 0 1 0 05 0 1 5 10 15 20 25 30 40 50 60 75 100 120 150 75 150 0 01 0 02 0 05 0 1 0 2 0 05 0 1 0 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 100 200 250 0 05 0 1 0 2 0 05 0 1 0 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 120 250 250 300 10 02 0 05 0 1 0 2 0 05 0 1 0 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 150 300 200 300 400 0 02 0 05 0 1 0 2 0 1 0 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 200 400 250 300 400 500 10 05 0 1 0 2 0 5 0 1 0 2 0 5 5 10 15 20 25 30 40 50 60 75 100 120 150 200 250 500 250 300 400 500 0 05 0 1 0 2 0 5 0 1 0 2 0 5 5 10 15 20 25 30 40 50 60 75 100 120 150 200 300 600 250 300 400 500 600 750 0 05 0 1 0 2 0 5 0 2 0 5 5 10 15 20 25 30 40 50 60 75 100 120 150 200 300 750 250 300 400 500 600 75
7. Main PCB s AC power supply jack Place DVM probes into rear sockets 3 2 3 2 Load Cell and RS232 terminals on Main PCB 3 2 3 3 Load Cell terminals 3 2 3 4 Typical Strain Gauge Load 3 3 3 5 Downward force on Load Cell bends the beam 3 3 3 6 Load Cell input and output through Wheatstone Bridge circuit 3 3 3 7 Typical Indicator Printed Circuit Board PCB 3 4 3 8 Load GG IN Wil rer TOT 3 4 3 9 Simulator connects to Wheatstone Bridge replacing load cell 3 4 3 10 Preferred 0 and max settingSs 3 5 Ohaus Corporation www ohaus com ii 3000 Series T32ME amp MC Indicators Service Manual TABLE OF CONTENTS FIGURE NO TITLE Page No 3 11 A FS 3 6 5 1 Series 3000 T32MC Indicator Housing amp Internal 5 5 2 5 1 Series 3000 T32ME Indicator Housing amp Internal 5 4 3000 Series T32ME MC Indicators Service Manual ii Ohaus Corporation www ohaus com TABLE OF CONTENTS Ohaus Corporation www ohaus com iv 3000 Series T32ME amp MC Indicators Service Manual CHAPTER 1 GETTING STARTED 1 1 INTRODUCT
8. Rejects the displayed setting or menu item and advances to the next available item Back Moves backwards through the upper and middle level menus Backs out of a list of selectable items to the previous middle level menu Exit Exits from menu directly to the active weighing mode Table 1 3 T32 MENU STRUCTURE SPAN NO NO OFE 054 Stability 14 LINEARITY LOW READOUT CAPACITY ON 2 GRADUATION 0 0005 20 LOW LIGHT MED T32ME HIGH OFF BACK ON LIGHT auto omon 5 Sl um 3000 Series T32ME amp MC Indicator Service Manual 1 7 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 8 RS232 INTERFACE CONNECTION The T32 has a bi directional RS232 interface for communication with printers and computers When communication is used data can be output various ways depending on PRINT menu settings For RS232 cable connections see Section 1 5 2 page 1 5 1 8 1 Setting Communications Parameters The T32 Indicator s default communication parameters are baud rate 9600 bits per second bps 8 databits no parity Handshake XON XOFF Stable Only Off and Autoprint Off To change these settings use the PRINT menu as follows 1 10 11 12 Press and hold TARE Menu until C A L appears Press No S E t U P appears Press No r E A d appears Press M O d E appears Press No U N I t appears Press No P r i n t appears Press Yes rESEt appear
9. electrical resistance of the circuit The difference in the output signal before and after the mass was placed on the Load Cell is measured interpreted and then becomes the value displayed on the indicator Figure 3 8 Downward force on Load Cell bends the beam The strain gauges are wired into a Wheatstone Bridge Circuit as illustrated in Figure 3 9 Strain Sense ka Excitation Supply Compression Tension LOADCELL 2 mV V mmm INPUT volts Compression Tension Excitation 4 strain gauges NES Supply connected as a Wheatstone Bridge Sense Sig ED OUTPUT millivolts Sig Some models 3mV V Figure 3 9 Route of Load Cell input and output through Wheatstone Bridge circuit A Load Cell is a force sensor which receives a voltage excitation from a regulated power source in the Indicator and returns a low voltage millivolt mV signal relative to the force applied The Load Cell signal is converted to a numeric value and displayed This output value increases as weight is loaded on to the Load Cell For example a 500kg Load Cell with 2mV V output and 5V excitation would have a change of 0 02mV per kg change in the load that is 2mV V 5V 0 02mV kg 500 kg At 250kg load the signal voltage would increase by 5mV from the value measured at no load Note Some load cells send 3mv V as opposed to 2mv V This increases accuracy and is sometimes use
10. i Lo iG Is Er Eee 1 7 15 tt 1 7 1 8 R9292 Interface seen 1 8 1 8 1 Setting Communications Parameters 1 8 1 8 2 Interface Commands ae gu 1 9 19 9 OuIDUt Format ee ee esse 1 9 1 9 Eegalror Trade EI stans a en ee 1 10 CHAPTER 2 TROUBLESHOOTING ERES EE 2 1 52 ITI gie M aa 2 1 23 2 2 24 Problem OVEN nenne 2 3 CHAPTER 3 MAINTENANCE PROCEDURES 3 1 Preventive Maintenance ae a 3 1 3 1 1 Preventive Maintenance Checklist 3 1 3 2 Testing and Replacement of Major Components 3 1 3 3 Testing the Printed Circuit Board PCB uuu uuu unuta una unukuna Qipa shinan 3 2 33 1 POB Voltage Measurements e uuu Ka Massa 3 2 332 Simulator o oM 3 2 3 3 2 1 How Strain Gauge Load Cells Operate 3 3 3 3 2 2 How to Operate 3 4 3 3 2 3 Correcting Underload and Overload Errors 3 5 33 24 General Load Tes u u aa euer 3 5 3 9 2 5 GA Test ns ara 3 5 3 4 Replacing the Printed Circuit Board PCB
11. small may not be accurate because average warning piece weight is smaller than can be accurately counted Ohaus Corporation www ohaus com 2 2 3000 Series T32ME amp MC Indicators Service Manual 2 4 PROBLEM SOLVER Unit will not turn on using AC power Cannot zero the Scale or will not zero when turned on Poor accuracy Unable to calibrate CHAPTER 2 TROUBLESHOOTING TABLE 2 2 PROBLEM SOLVER Power cord problem Power outlet not supplying electricity Load on Scale exceeds allowable limits Load on Scale is not stable Load Cell is damaged PCB is damaged Improper calibration Unstable environment PCB is damaged Load Cell is damaged Unstable environment Incorrect calibration mass Lock Calibration Menu set to On Lock switch on PCB is on LFT menu set to On 3000 Series T32ME amp MC Indicators Service Manual 2 3 Check power cord connections Make sure power cord is plugged in properly into the power outlet Check power source Check Power Supply PCB replace if necessary Section 3 6 Remove load on Scale Wait for load to become stable Replace Load Cell Test Replace PCB Section 3 6 Perform calibration Move scale to suitable location Test Replace PCB Section 3 3 Replace Load Cell Move the scale to suitable location Use correct calibration mass Set Lock Calibration Menu to Off Set the Lock switch on PCB to Off Set LFT menu to Off If problem contin
12. with a carriage return CR or carriage return line feed CRLF Data output by the Indicator is always terminated with a carriage return line feed CRLF 1 8 3 Output Format The default serial output format is shown below TABLE 1 5 DEFAULT SERIAL OUTPUT FORMAT Field Polarity Space Weight Space Unit Stability Legend CR LF 3 1 1 1 7 1 85 1 a Definitions Polarity sign if negative blank if positive Weight up to six numbers and one decimal right justified leading zero blanking Units up to five characters Stability character is printed if not stable blank if stable Legend up to 3 characters G gross weight NET net weight T tare 3000 Series T32ME amp MC Indicator Service Manual 1 9 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 9 LEGAL FOR TRADE LFT NOTE When LFT is set to ON through the LFT sub menu and the LFT switch on the Main PCB is set to ON see Figure 1 1 page 1 4 the following menu settings cannot be changed Span Calibration Linearity Calibration Calibration Unit GEO LFT Capacity Graduation Zero Range Stable Range AZT Modes and Units To enable editing of these menu settings open the Indicator and return the LFT switch on the Main PCB to the OFF position Then set the LFT menu item to OFF as follows 1 gt ars er Press and hold TARE Menu until C A L appears then pre
13. 0 1000 0 05 0 1 0 2 0 5 1 0 2 0 5 1 5 10 15 20 25 30 40 50 60 75 100 120 150 200 500 1000 250 300 400 500 600 750 1000 1200 0 1 0 2 0 5 1 0 2 0 5 1 5 10 15 20 25 30 40 50 60 75 100 120 150 200 600 1200 250 300 400 500 600 750 1000 1200 1500 0 1 0 2 0 5 1 0 5 1 5 10 15 20 25 30 40 50 60 75 100 120 150 200 750 1500 250 300 400 500 600 750 1000 1200 1500 3000 Series T32ME amp MC Indicators Service Manual A 3 Ohaus Corporation www ohaus com Span calibration points APPENDIX A CALIBRATION apacity 2000 2500 3000 5000 6000 7500 10000 12000 15000 20000 TA Graduation size with LFT OFF BLE A 1 SETUP amp CALIBRATION VALUES Linearity Graduation size d with LFT ON Span calibration points G 0 5 1 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 1000 2000 250 300 400 500 600 750 1000 1200 1500 2000 0 5 1 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 1200 2500 250 300 400 500 600 750 1000 1200 1500 2000 2500 0 5 1 2 5 10 15 20 25 30 40 50 60 75 100 120 150 200 1500 3000 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 120 5 10 15 20 25 30 40 50 60 75 100 120 150 200 2500 5000 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 1 2 5 5 10 15 20 25 30 40 50 60 75
14. 100 120 150 200 2500 5000 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 6000 2 5 5 10 15 20 25 30 40 50 60 75 100 120 150 200 3000 7500 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 6000 7500 2 5 10 5 10 15 20 25 30 40 50 60 75 100 120 150 200 5000 10000 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 6000 7500 10000 2 5 10 5 10 15 20 25 30 40 50 60 75 100 120 150 200 5000 10000 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 6000 7500 10000 12000 5 10 5 10 15 20 25 30 40 50 60 75 100 120 150 200 7500 15000 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 6000 7500 10000 12000 15000 5 10 20 5 10 15 20 25 30 40 50 60 75 100 120 150 200 10000 20000 250 300 400 500 600 750 1000 1200 1500 2000 2500 3000 5000 6000 7500 10000 2000 Ohaus Corporation www ohaus com A 4 3000 Series T32ME amp MC Indicators Service Manual APPENDIX B GEOGRAPHICAL ADJUSTMENT APPENDIX B GEOGRAPHICAL ADJUSTMENT B 1 Geographical Adjustment Factor The Geographical Adjustment Factor GEO is used to compensate for variations in gravity Local gravity variance depending on distance from the equator and altitude above sea level is compensated for by entering a Geocode conversion factor Note Changing the GE
15. 6 6 5 5 4 4 23 54 25 21 9 8 8 7 7 6 6 5 5 4 25 21 26 45 9 8 8 7 7 6 6 5 5 26 45 28706 9 8 8 7 7 6 6 5 28206 29 25 9 8 8 7 7 6 6 29 25 30741 9 8 8 7 7 6 30 41 31 56 9 8 8 7 7 31256 33 09 9 8 8 7 33 09 34221 9 9 8 8 34 21 35931 10 9 9 8 35 31 36 41 10 10 9 9 36 41 37 50 11 10 10 9 3000 Series T32ME amp MC Indicators Service Manual B 1 Ohaus Corporation www ohaus com APPENDIX B GEOGRAPHICAL ADJUSTMENT TABLE B 1 GEOGRAPHICAL ADJUSTMENT VALUES Elevation above sea level meters Geographical 0 325 650 975 1300 1625 1950 2275 2600 2925 3250 latitude away 325 650 975 1300 1625 1950 2275 2600 2925 3250 3575 from the equator North Elevation above sea level in feet or South in degrees and 0 1060 2130 3200 4260 5330 6400 7460 8530 9600 10660 minutes 1060 2130 3200 4260 5330 6400 7460 8530 9600 10660 11730 15 14 14 13 13 12 12 11 11 10 10 14 14 13 13 12 12 11 11 10 37 50 38 58 38 58 40 05 11 11 12 11 40 05 41712 41 12 42 19 42 19 43 26 12 12 43 26 44932 13 12 44 32 45 38 13 13 45938 46245 14 13 46 45 47 51 14 14 47 51 48 58 15 14 48 58 50 06 15 15 50 06 51213 16 15 51 13 52 22 16 16 52 22 53 31 17 16 53 31 54 41 17 17 54 41 55 52 18 17 55 52 57 04 18 18 57 04 58 17 19 1
16. 8 58 17 59932 19 19 59 32 60 49 20 19 60249 62209 20 20 62 09 63930 21 20 63 30 64 55 21 21 64 55 66 24 22 21 66 24 67 57 22 22 67 57 69 35 23 22 69 35 71721 23 23 71 21 73 16 24 23 73 16 75 24 24 24 75724 77 52 25 24 77 52 80 56 25 25 80 56 85 45 26 25 85245 90 00 26 26 Ohaus Corporation www ohaus com B 2 3000 Series T32ME amp MC Indicators Service Manual OHAUS 8 0 2 5 3 1 5 3 P N 80253153 SERVICE MANUAL 3000 SERIES T32MC amp T32ME INDICATORS
17. 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 CAUTION When handling the PC Board grasp it by the edges N only Do not touch the foil side Static discharge may damage some components 1 Disconnect power from the scale and open the indicator housing Also remove the battery Disconnect the Load Cell cable from the PC Board With the Simulator set to zero attach it to the PCB See Figure 3 11 Connect a known good AC Adapter to the scale and connect to a power source Turn on the scale Correct for underload and overload errors as explained above pE a xe m 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 For zero set the simulator to 0 2mv V and use 1 8mv V for full capacity For half capacity use 1 0 and so on If the resulting readings are unstable the Main PC Board is defective 8 Use the Simulator to calibrate the scale in the next procedure 3 3 2 7 Calibration Test 1 Calibrate the scale using the simulator following steps in Appendix A 2 Follow the scale prompts When the indicator displays a given weight to be placed on the scale set the simulator to an equivalent value as explained in point 7 above 3 Upon completion of calibrati
18. ION This service manual contains the information needed to perform routine maintenance and service on the Ohaus T32ME and T32MC Indicators The contents of this manual are contained in five chapters Chapter 1 Getting Started Contains information regarding service facilities tools and test equipment specifications hardware setup operating the Indicator and configuring the Indicators communication and Legal for Trade menus Chapter 2 Troubleshooting Contains a problem solver 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 T32 Indicators identifying all serviceable components Before servicing the indicator you should be familiar with the Instruction Manual which is packed with every indicator 1 2 SERVICE FACILITIES To service an indicator the service area should meet the following requirements e Must be protected from electrostatic discharge e Should be temperature controlled and meet the indicator 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 Must be free of air currents or drafts from air c
19. O Factor alters the calibration The GEO value was set at the factory and should only be changed if the location of use varies from the default setting To adjust the GEO Factor press and hold TARE Menu until C A L appears Press Yes SPAN appears Press No Linearity appears Press No GEO appears Press Yes The default GEO setting appears Press No to increment the number or Back to decrement until the desired number appears Then press Yes GEO appears again Press No to exit the GEO menu End appears Press Yes to return to the CAL menu Press No continuously until E n d appears Press Yes to return to weighing mode TABLE 1 GEOGRAPHICAL ADJUSTMENT VALUES Elevation above sea level in meters Geographical 0 325 650 975 1300 1625 1950 2275 2600 2925 3250 latitude away 325 650 975 1300 1625 1950 2275 2600 2925 3250 3575 from the equator North Elevation above sea level in feet or South in degrees and 0 1060 2130 3200 4260 5330 6400 7460 8530 9600 10660 minutes 1060 2130 3200 4260 5330 6400 7460 8530 9600 10660 11730 5 4 4 9 9 2 2 0 00 5746 1 1 0 0 5 46 9 52 5 5 4 4 3 3 2 2 1 1 0 9 52 12 44 6 5 5 4 4 3 3 2 2 1 1 12 44 15 06 6 6 5 5 4 4 3 3 2 2 1 15706 17 10 7 6 6 5 5 4 4 3 3 2 2 17 10 19 02 7 7 6 6 5 5 4 4 3 3 2 19702 20 45 8 7 7 6 6 5 5 4 4 3 3 20 45 22 22 8 8 7 7 6 6 5 5 4 4 3 22 22 23 54 9 8 8 7 7
20. and how a load cell simulator may be used to test the indicator If after the replacement of any component the Indicator is still non functional and no other information on the subject is available in the manual 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 3000 Series T32ME amp MC Indicators Service Manual 3 1 Ohaus Corporation www ohaus com CHAPTER 3 REPAIR PROCEDURES 3 3 TESTING THE PRINTED CIRCUIT BOARD 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 CAUTION When handling the PC Board grasp it by the edges only Do not touch the foil side Static discharge may damage some components 3 3 1 PCB Voltage Measurements 1 Disconnect the power and open the indicator housing 2 Connect AC power to the scale and turn it on 3 Measure power from Main PCB sAC 7 Tog power supply jack See Figure 3 1 f It should read between 6 75 and 6 9 Figure 3 1 Main PCB s AC power supply jack Place DVM probes into rear sockets volts dc with power off and 7 2 7 5 volts dc with power on 4 Using a DVM measure the excitation voltage EXE and EXE in Figures 3 2 and 3 3 The reading should be 5 volts dc This is the excitation voltage for the Load Cell and is re
21. and then restored 5 Turn the Indicator OFF and disconnect the AC Adapter or power cord 6 Wait one minute then reconnect the AC Adapter or power cord to the Indicator 7 Check to insure that the Indicator retained calibration settings 4 6 RS232 Interface Test Print Test The RS232 Interface performance can be monitored using an external printer or computer connected to the Indicator To set up communication parameters see Section 1 8 Once the communications parameters match between the Indicator and either a computer or printer it is possible to test the Indicator s print function Press the Print Units button Printing to an external printer or computer should occur each time the button is pressed Ohaus Corporation www ohaus com 4 2 3000 Series T32ME amp MC Indicators Service Manual CHAPTER 5 PARTS LISTS amp DIAGRAMS This section of the manual contains exploded views for the 3000 Series T32 Indicators The exploded view drawings are designed to identify the parts which can be serviced on the Indicator in the field NOTE In all cases where a part is replaced the indicator must be thoroughly checked after the replacement is made The indicator MUST meet the parameters of all applicable specifications in this manual If further technical information is needed please contact your local Ohaus office or Ohaus Corporation www ohaus com 7 Campus Drive Suite 310 Parsippany NJ 07054 USA Tel 973 377 9000
22. cur each time stability criteria are met ON StAB or at a defined interval INtEr or continuously The default setting is Off Press No until the preferred setting appears Then press Yes A Print appears Press No INtEr appears If INtEr was selected use the INtEr sub menu to set the interval from 1 to 3600 seconds Press No to advance Back to regress and Yes to accept a setting After you press Yes INtEr appears again Press No twice then Yes when End appears No when P r i n t appears No again and Yes when End appears again to exit menu mode Ohaus Corporation www ohaus com 1 8 3000 T32ME amp MC Indicator Service Manual CHAPTER 1 GETTING STARTED 1 8 2 Interface Commands The RS232 Interface enables a computer to be used to control some functions of the Indicator using the commands listed in Table 1 4 TABLE 1 4 SERIAL INTERFACE COMMAND TABLE Command Function ___________ IP Immediate Print of displayed weight stable or unstable __________ ___ ____ Print stable displayed weight according to stability setting Download Tare value in grams positive values only Sending OT clears tare if allowed Print current unit g kg Ib oz 16 02 Set scale to unit x 1 0 2 kg 4 02 5 10 02 Version print name software revision and LFT ON if LFT is set ON Global reset to reset all menu settings to the original factory defaults NOTES Commands sent to the Indicator must be terminated
23. d either for very high resolution or for high capacity scales equipped with large dead load platforms Sense wires In some cases the load cell is equipped with Sense wires which run parallel with the positive and negative Excitation wires The Sense wires compensate for resistance in the cable and are often used if there is long distance between load cell and indicator Ohaus Corporation www ohaus com 3 4 3000 Series T32ME amp MC Indicators Service Manual CHAPTER 3 REPAIR PROCEDURES 3 3 2 2 How Strain Gauge Load Cells Operate continued Figure 3 10 shows a typical Load Cell wiring scheme for an indicator Note that some weighing units do not have Sense connectors When they do they also have Sense Jumpers W1 and W2 in Figure 7 which must be shorted if the load cell does not have Sense wires to connect to the terminal The Shield terminal is often labeled GND Ground but its function is to shield current to or from the other connectors to ensure accurate measuring results Sense Exe Jumper W2 Sens Load Cell Sig i SHIELD Sig Sense Sens SWS Jumper W1 Ei LFTON LFTOFF Figure 3 10 T32ME MC Indicator Printed Circuit Board PCB Figure 3 11 Load Cell wiring 3 3 2 3 How to Operate Simulators 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 calibratio
24. d observe the display The display should indicate Error 8 4 Release the platform The display should return to zero Note Do not exceed Load Cell capacity when testing the Indicator 2 Place a mass on the scale base platform which slightly exceeds the capacity of the scale base and observe the Indicator display The display should indicate Error 8 3 Remove the mass from the scale base The display should return to zero 3000 Series T32ME amp MC Indicators Service Manual 4 1 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 4 4 Performance Tests Using a Load Cell Simulator A simulator can be used in place of a scale base if available Connect the simulator to Terminal Block J7 the Load Cell terminal block on the PCB so that EX EX S and S are matched at each end of the cable See Figures 1 2 and 1 3 page 1 4 4 4 1 Overload Underload Test 1 Set the simulator to zero Power on the Indicator Perform a Span Calibration with zero at the simulator s 0 2 setting and 100 capacity at the 1 8 mv V setting 2 Adjust the simulator to zero mv V The indicator should show Error 8 4 3 Adjust the simulator to 2 0 mv V The indicator should show Error 8 3 4 Adjust the simulator to each setting between 0 2 mv V and 1 8 mv V The indicator reading should be stable and linear throughout the range of settings 4 5 Calibration Retention Test This test checks that the Indicator retains calibration after power is removed
25. e indicator the display may indicate an error code Table 2 1 describes the error codes and specifies the probable cause and remedy TABLE 2 1 ERROR CODES ERROR PROBABLE CAUSE REMEDY Error 7 0 Unstable weight reading when Check platform location defining reference weight Test with Strain Gauge Simulator Error 8 1 Weight reading exceeds Remove load from scale Power On Zero limit Recalibrate scale If error continues Test the PCB replace if necessary Error 8 2 Weight reading below Add load to scale Power On Zero limit Recalibrate If error continues Test the PCB replace if necessary Error 8 3 Weight reading exceeds Overload Reduce load on scale limit If error continues Test the PCB replace if necessary Error 8 4 Weight reading below Underload Recalibrate If error continues limit Test the PCB replace if necessary Error 9 0 Internal fault Cycle power If error continues Test the PCB replace if necessary Error 9 5 Calibration data not present Calibrate scale If error continues Test the PCB replace if necessary Error 53 EEPROM data incorrect Cycle power on and off If error continues Test the PCB replace if necessary CALE Calibration Error Calibration value Repeat calibration using correct outside allowable limits calibration weights If error continues Test the PCB replace if necessary LOW rEF In Pieces mode the average You may continue to weigh but results piece weight of the parts is
26. gulated If the voltage is lower replace the PCB See Section 3 2 5 Perform Operational Tests Figure 3 2 Load Cell and RS232 terminals See Chapter 4 on Main 6 Perform simulator testing Next section Exe Sens Sig GND Sig Sens Exe Figure 3 3 Load Cell terminals close up 3 3 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 indicator to be separated from the Load Cell for the purposes of troubleshooting and calibration The next section explains in detail how simulators work and what type of load cells they can substitute for i e simulate Ohaus Corporation www ohaus com 3 2 3000 Series T32ME amp MC Indicators Service Manual CHAPTER 3 REPAIR PROCEDURES 3 3 2 1 Simulators Can Substitute for Standard Strain Gauge Load Cells Strain gauge simulators can only substitute for standard strain gauge load cells Figure 3 4 The following explanation applies to strain gauges with Wheatstone Bridge circuitry connecting directly to terminals on a Main Printed Circuit Board PCB Some strain gauges have internal signal processing such as the Adventurer Pro Figure 3 5 A simulator cannot be substituted for this type of strain gauge Figure 3 4 Standard Strain Gauge Load Figure 3 5 Strain Gauge Load Cell assembly Cell non standard proprietary connection Figure 3 3 sho
27. instruction manual weights etc Keep a record of all items and note their condition 1 Examine the Indicator for signs of abuse such as a cracked top cover or base damage from liquids cracks on corners which may suggest the unit was dropped Open the Indicator by removing the four screws in the rear housing Be careful not to stretch the cables that connect the main Printed Circuit Board PCB to the outlets RS232 and Load Cell ports and power supply Examine the top of the main PCB for cracks or signs of corrosion If it appears that corrosion may have affected the board and you want to examine the bottom of the PCB remove the four screws holding it to the housing Carefully lift out the main PC board If it is cracked or shows signs of corrosion it requires replacement See Chapter 3 Maintenance Procedures for board replacement and testing If the Indicator shows no sign of physical damage continue with procedures oee chart below for visual checking procedures DAMAGED REPLACE TOP COVER TOP COVER DAMAGED REPLACE BOTTOM COVER BOTTOM COVER E DAMAGED REPLACE ASSEMBLE INTERNAL MAIN PC BOARD MAIN PC BOARD AND TEST LCD DISPLAY PARTIALLY LIT OR BLACKENED REPLACE MAIN PC BOARD PANEL SWITCHES NON FUNCTIONAL Figure 2 1 Visual Checking Procedures 3000 Series T32ME amp MC Indicators Service Manual 2 1 Ohaus Corporation www ohaus com CHAPTER 2 TROUBLESHOOTING 2 3 ERROR CODES When a problem occurs using th
28. n A typical Ohaus Load Cell is rated at 2mV V output with a 5 Volt excitation voltage applied These values vary for specific models 3 3 2 4 How to Attach a Simulator The simulator s wires connect to the Load Cell wiring terminals on the Main PCB of the indicator or scale See Figure 3 11 Note that some simulators do not have Sense terminals See Figure 3 12 The simulator creates the same Wheatstone Bridge circuit as a load cell does Excitation VERNIER Input 0 4 in volts Load Cell Simulator Signal Output COARSE FINE in millivolts Figure 3 12 Simulator connects to Wheatstone Bridge replacing load cell 3000 Series T32ME amp MC Indicators Service Manual 3 5 Ohaus Corporation www ohaus com CHAPTER 3 REPAIR PROCEDURES 3 3 2 5 Correcting Underload and Overload Errors When first connected to a simulator and turned on the indicator may display an underload error with the simulator set to 0 Turn the simulator s m 4 main knob to 0 2 The indicator should read 002 18 2 close to 0 Use the Coarse Fine knob COARSE to adjust the reading to display zero ore O FE Figure 3 13 Preferred 0 and max settings Similarly at a simulator setting of 2 0 the indicator may display an overload error Turn the simulator 5 main knob to 1 8 The indicator should read close to full capacity Use the Coarse Fine knob to adjust the reading until the display shows full capacity 3 3 2 6
29. on 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 Ohaus Corporation www ohaus com 3 6 3000 Series T32ME amp MC Indicators Service Manual CHAPTER 3 REPAIR PROCEDURES 3 4 REPLACING THE PRINTED CIRCUIT BOARD PCB Repairs are not recommended on the PCB Component parts of the PCB are not stocked by Ohaus Replacement is recommended rather than repairing Replace the PCB as follows 1 Unplug the Indicator from the AC power source 2 Open the Bottom Housing 3 Disconnect the wires connected to the RS232 Connector Block J7 SW5 ms 4 Disconnect the wires from the scale s LETON LILFTOFF load to the PCB s Load Cell Terminal Figure 3 14 Main PCB Block J5 See Figure 3 14 as well as Figures 3 2 and 3 3 5 Carefully disconnect the AC power and battery connectors and the Membrane Switch cable 6 Remove the four screws from the PCB 7 Lift out the PCB CAUTION When handling the PCB grasp it by the edges only Do not touch the foil side Static discharge may damage some components 8 Reconnect the Cable Sets and connectors removed in Steps 3 5 9 Perform calibration procedures See Appendix A 10 Perform testing procedures See Chapter 4 3 5 CABLE SET REPLACEMENT Note The cables that connect the PCB to the Load Cell connector the RS232 connector and the p
30. onditioning heating ducts open windows people walking by fans etc 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 3000 Series T32ME amp MC Indicator Service Manual 1 1 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 3 TOOLS AND TEST EQUIPMENT REQUIRED In order to properly service the Indicator certain 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 Ohaus Scale Base 2 Load Cell Simulator optional 3 Computer with RS232 Interface for testing the RS232 communications 4 RS232 Interface cable 25 pin PN 80500524 9 pin PN 80500525 5 Data Printer for use with RS232 communications 6 ESD work station or mat 1 3 2 Standard Tools and Test Equipment List 1 Standard Electronics Tool Kit 2 Digital Voltmeter DVM with clip on probes Input impedance of at least 10 megohms in the 1 Volt dc position 3 Soldering Iron solder and flux remover Ohaus Corporation www ohaus com 1 2 3000 T32ME amp MC Indicator Service Manual CHAPTER 1 GETTING STARTED 1 4 SPECIFICATIONS TABLE 1 1 SPECIFICATIONS Capacity Range 5 to 20 000 kg or Ib digit 7 segment backlit LCD digit 7 segment Red LED 5 2 or 100 of capacity 5
31. ower jacks are all sold as a single set Replace them as follows 1 Open the Housing 2 Disconnect the cables from any of the connectors RS232 Load Cell power jacks for which the cable set is to be replaced 3 Reconnect the wires to the PCB 3000 Series T32ME amp MC Indicators Service Manual 3 7 Ohaus Corporation www ohaus com CHAPTER 3 REPAIR PROCEDURES 3 6 FUNCTION LABEL REPLACEMENT 1 Carefully remove the old Function Label It is held in place with a strong adhesive 2 Clean the Top Cover and remove all traces of adhesive 3 Remove the protective backing from the back of the new Function Label Carefully position it on the Top Housing starting at the bottom of the cover Use a rolling motion to smooth it into position 4 Close the Housing if opened previously re insert and tighten the four screws previously removed 5 Perform calibration procedures See Appendix A 6 Perform testing procedures See Chapter 4 Ohaus Corporation www ohaus com 3 8 3000 Series T32ME amp MC Indicators Service Manual CHAPTER 4 TESTING 4 1 TESTING Before and after servicing the Indicator operational and performance tests should be made to determine if it meets specifications Turn the Indicator ON and allow it to warm up for at least 10 minutes before performing these checks The masses used for calibration should be ASTM Class 4 or OIML F2 tolerance or better NOTE A Make sure the test area is free from drafts and
32. rs Press Yes twice to exit menu mode Allow the Indicator to warm up for approximately five minutes after stabilizing to room temperature To abort calibration press the Exit button anytime during the calibration process 3000 Series T32ME amp MC Indicators Service Manual A 1 Ohaus Corporation www ohaus com APPENDIX A CALIBRATION A 2 SPAN CALIBRATION Span Calibration uses two points the first point is the zero value with no weight on the scale The second point is the Span value with a calibration mass placed on the scale Press and hold TARE Menu until C A L appears then press Yes SPAN appears Press Yes to access the Span Calibration menu The display flashes 0 With no weight on the scale press Yes to establish the zero point The display shows C while the zero point is established The display flashes the span calibration point Place the specified weight on the scale and press Yes To choose a different span point press No to increment the selections or Back to decrement the selections See Appendix A for available span points When the desired value is displayed place the specified weight on the scale and press Yes The display flashes C while the span point is established If span calibration was successful the scale exits to the active weighing mode and displays the actual weight value A 3 LINEARITY CALIBRATION Linearity calibration uses three calibration point
33. s Press No bAUd appears Press Yes The default Baud rate setting 9600 bps appears To change the setting press No The menu cycles to the next setting each time you press No first 9600 then 300 600 1200 2400 4800 and 9600 again Press Yes when the desired setting appears bAUd appears again Press No PAritY appears Press Yes The default Parity setting 8 NONE appears To change the setting press No The menu cycles to the next setting each time you press No first 7 Even then 7 Odd 7 None and 8 None again Press Yes to accept a setting PAritY appears again Press No StOP appears Press Yes The default Stop Bit setting 1 appears To change the setting press No The menu toggles to the next setting each time you press No first 1 then 2 then 1 again Press Yes when the desired setting appears StOP appears again Press No HANd appears Press Yes The default Handshake setting On Off Xon Xoff appears To change the setting press No The menu toggles to the next setting each time you press No first Off then On Off then Off again Press Yes when the desired setting appears HANd appears again Press No StAbLE appears Press Yes The Stable setting allows the Indicator to print values only when the stability criteria are met To choose ON press Yes If you press No Off appears Press Yes to accept a setting Then StAbLE appears Press No A Print appears Press Yes Auto Print sets printing to oc
34. s the first with no weight on the scale the second at approximately half capacity the third at capacity The Linearity calibration points are fixed and cannot be altered user during the procedure See Appendix A for the linearity points Press and hold TARE Menu until C A L appears then press Yes SPAN appears Press No Linearity appears Press Yes to access the Linearity Calibration menu The display flashes 0 With no weight on the scale press Yes to establish the zero point The display shows C while the zero point is established x The display flashes the mid calibration point Place the specified weight on the 5 scale and press Yes The display shows C while the mid calibration point is established The display flashes the full calibration point Place the specified weight on the scale and press Yes ES The display shows C while the full calibration point is established After successful calibration the scale exits to the active weighing mode and displays the actual weight value Ohaus Corporation www ohaus com A 2 3000 Series T32ME amp MC Indicators Service Manual APPENDIX A CALIBRATION A 4 SETUP amp CALIBRATION VALUES Use Table A 1 to determine appropriate setup and calibration values for specific configurations TABLE A 1 SETUP amp CALIBRATION VALUES Linearity Canacit Graduation size with Graduation size calibration ET OFF with LFT ON saints 5 10
35. s to the next menu or menu item Rejects the current setting on display advances to next available setting Increments value Accepts the current setting on the display Ohaus Corporation www ohaus com 1 6 FUNCTION Mode Back FUNCTION Initiates an application mode Mode Allows changing the application mode Press and hold allows scrolling through modes Back Moves back to previous menu item Decrements the value NET CALIBRATION MODE Figure 1 8 T32ME LED Display TARE Performs a tare operation Menu Enter the User menu Extended press View the Audit Trail event counters Exit Exits User menu Aborts calibration 3000 T32ME amp MC Indicator Service Manual CHAPTER 1 GETTING STARTED 1 7 OPERATION 1 7 1 Power ON To turn the indicator on press ON ZERO Off short press The indicator performs a display test momentarily displays software version and then enters the active weighing mode 1 7 2 Power OFF To turn the power off press ON ZERO Off long press The indicator shuts down 1 7 3 Menu Setup To enter the Menu Mode press and hold the TARE Menu button until MENU appears on the display The first upper level menu appears on the display Use Yes No Back and Exit to navigate in Menu Mode Yes Allows entry into the displayed menu Accepts the displayed setting and advances to the next menu item No Skips by the displayed menu
36. ss S E t U P appears Press Yes rESEt appears Press No LFt appears Press Yes OFF appears Press Yes LFt appears again Press No Continue to press No until END appears Press Yes Or simply press Exit after leaving the LFT menu The Indicator returns to weighing mode It is now possible to use the menus mentioned above After the LFT CAL Lock setting has been turned off the scale must be inspected in accordance with local weights and measures regulations before it can be used in LFT mode again The weights and measures official may apply a wire or paper security seal as shown below Paper Seal D F I T Figure 1 9 T32 Wire Seal Figure 1 10 T32 Paper Seal Ohaus Corporation www ohaus com 1 10 3000 T32ME amp MC Indicator Service Manual 2 1 CHAPTER 2 TROUBLESHOOTING INTRODUCTION This section of the manual covers visual inspection of the Indicator troubleshooting and Error Code table Table 2 1 and a Problem Solver Table 2 2 For setup and connection to either a known good base or simulator see Chapter 1 Follow all directions step by step Make certain that the work area is clean and use care when handling components of the Indicator 2 2 VISUAL INSPECTION Carefully remove the Indicator from its packing container and remove any packing material fastened to the unit Note all items supplied with the unit such as AC power supply cables
37. th no sense wires short Jumpers W1 and W2 For a 6 wire load cell with sense wires OR open Jumpers W1 and W2 OPEN JUMPERS SHORTED JUMPER For load cells with a ground shield wire connect the shield to the center position GND Figure 1 4 Jumpers 1 5 2 RS232 Interface Each model has a standard 9 pin D style RS232 connector with a pin configuration as illustrated in Figure 1 7 Figure 1 5 Bottom of Housing Pin Connection 1 N C 5 00 CO 2 TXD 3 RXD 9 Q 4 N C 5 GND Figure 1 6 RS232 Pins 6 9 N C To adjust RS232 settings see Section 1 8 page 1 8 3000 Series T32ME amp MC Indicator Service Manual 1 5 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 6 OVERVIEW OF THE CONTROLS Stable weight indicator Symbols for Pounds Ounces Kilograms Grams gt V Figure 1 7 T32MC LCD Display Checkweigh indicators Hold Accum 5 Indicators for Center of Zero Hold Accumulation Mode also Stable weight T32ME Counting PCS Mode Net weight amp Calibration Mode Primary Function Short Press Secondary Function Long Press Menu Function Short Press TABLE 1 2 FUNCTIONS OF DISPLAY CONTROLS ON ZERO Off Yes ON ZERO Turns the Indicator on PRINT Sends the current value to the COM port if AUTOPRINT is set to Off Off Units Turns the Changes the Indicator off weighing unit Yes No Advance
38. that the base rests on a level and vibration free surface 4 2 Power Test The purpose of this test is to determine if the electronic circuitry of the Indicator is functioning properly In some cases the AC Adapter or line cord supplied with the Indicator may have become defective 1 First be sure the AC Adapter is functioning properly then connect it to the Indicator power plug 2 Plug the AC Adapter or power cord into a suitable power source 3 With the Indicator connected to an appropriate power supply press the ON ZERO Off button The Indicator 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 If the display was erratic the PC board is defective and requires replacement 4 3 Performance Tests Using a Scale Base These tests are performed on the Indicator using a known good scale base and test mass At this point the Indicator has been checked for full display menu setup and calibrated If a Load Cell Simulator is being used proceed to paragraph 4 4 4 3 1 Overload Underload Test This test determines if the Indicator displays the proper indication when an underload or overload condition exists on the scale base 1 With the Indicator ON and no mass on the scale base lift up on the scale base platform an
39. ual CHAPTER 5 PARTS LISTS amp DIAGRAMS 5 2 3000 SERIES T32ME LED INDICATOR HOUSING amp INTERNAL PARTS TABLE 5 2 T32ME LED INDICATOR HOUSING amp INTERNAL PARTS 5 LED s Univeral Adapter DEAN _____ 3000 Series T32ME amp MC Indicators Service Manual 5 5 Ohaus Corporation www ohaus com CHAPTER 5 PARTS LISTS amp DIAGRAMS Ohaus Corporation www ohaus com 5 6 3000 Series T32ME amp MC Indicators Service Manual APPENDIX A CALIBRATION APPENDIX A CALIBRATION Two calibration processes are available Span Calibration and Linearity Calibration A 1 PRELIMINARY STEPS 1 2 Be sure appropriate calibration masses are available before beginning calibration Be sure the scale base is level and stable during the entire calibration process If LFT is set to On calibration is unavailable To set LFT to OFF see Section 1 10 page 1 13 Note To use the mode again after turning it off it is necessary to have the Indicator locked and sealed by local Weights and Measures authorities If the Calibration Menu is locked in the Menu Lock submenu turn it back on Press and hold TARE Menu until C A L appears then press No SETUP appears Press No READOUT appears Press No MODE appears Press No UNIT appears Press No PRINT appears Press No MENU LOCK appears Press Yes RESET appears Press No CALIBRATE appears Press Yes Then press No continuously until End appea
40. ues test replace PCB Ohaus Corporation www ohaus com CHAPTER 2 TROUBLESHOOTING Ohaus Corporation www ohaus com 2 4 3000 Series T32ME amp MC Indicators Service Manual CHAPTER 3 REPAIR PROCEDURES 31 PREVENTIVE MAINTENANCE Ohaus Indicators are precision instruments and should be carefully handled stored in a clean dry dust free area and cleaned periodically Follow these precautionary steps When an Indicator has had chemicals liquids spilled on it all exterior surfaces should be cleaned as soon as possible with warm water on a damp cloth Allow at least 10 minutes for the Indicator to stabilize after the indicator reaches the temperature of the environment 3 1 1 Preventive Maintenance Checklist The Indicator should be inspected and checked regularly as follows 1 Unplug the AC Adapter before cleaning 2 Clean the outside using a cloth dampened with a mild detergent CAUTION N 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 TESTING AND REPLACEMENT OF MAJOR COMPONENTS The decision to replace any component should only be made after thoroughly diagnosing the problem This chapter provides guidance for testing all components prior to replacement It includes an explanation of how load cells work
41. ws the difference between standard and non standard strain gauge load cells The wires on the standard strain gauge load cell left connect directly to the Main PCB The non standard strain gauge load cell right has a proprietary connection Standard Strain Gauge Load Cell Non Standard Strain Gauge Load Cell Load Cell s Wheatstone Bridge circuit connects directly to Load Cell has internal signal processing and a the Main PCB with 4 or 6 wires See p 2 for details proprietary connection to the Main PCB Proprietary Z Connection Figure 3 6 Connection difference on standard and non standard strain gauge load cells 3 3 2 2 How Strain Gauge Load Cells Operate Beam Strain Gauges Attachment points Load Cells convert force into a signal The to Platform Strain Gauge Load Cell is a metal beam with holes drilled in it Strain gauges are affixed to the beam at the top and bottom to measure changes in the beam due to deflection The gauges sense very small deflections in the metal caused by the load applied to the cell Internal PCB Figure 3 7 Typical Strain Gauge Load Cell 3000 Series T32ME amp MC Indicators Service Manual 3 3 Ohaus Corporation www ohaus com CHAPTER 3 REPAIR PROCEDURES 3 3 2 2 How Strain Gauge Load Cells Operate continued At zero load all strain gauges are unstressed Weight placed on the Load Cell bends the beam causing two gauges to stretch and two to compress in opposition changing the
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