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1. 5 2 5 2 3000 Series T31XW Indicator Housing amp Internal Parts 5 4 APPENDIX A SETUP amp CALIBRATION VALUES Appendix A Setup amp Calibration Values nennen A 1 APPENDIX GEOGRAPHICAL ADJUSTMENT VALUES Appendix B Geographical Adjustment Values nennen nennen B 1 LIST OF TABLES TABLE NO TITLE Page No 1 1 Specifications EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEMM 1 3 1 2 Functions of Display CGontrols nennen nennen 1 7 1 3 Leit 1 8 1 4 Interlace Command RE e EE 1 12 2 1 IAGO SHG Gulden ee ee T 2 3 4 1 Increasing Decreasing Load Test 4 2 5 1 T31P Indicator Housing amp Internal Parts nenn nenne nenne nenne nennen 5 3 5 2 T31XW Indicator Housing amp Internal Hate 5 5 A 1 Setup amp Calibration Values eesssseessseseeenneeenen nnne A 1 B 1 Geographical Adjustment Values nennen B 1 LIST OF ILLUSTRATIONS FIGURE NO TITLE 1 1 Printed Circuit Board PCB T31 nennen 1 4 1 2 GEIL WIEN e RR M 1 4 1 3 Open shorted Bt ul e 1 4 1 4 Rear Danel EPA ee ee ee ee 1 5 1 5 Reload E 1 5 1 6 EEN DL EE 1 6 1 7 Wie EE 1 13 1 8 Paper E 1 13 1 9 EENS WAS Se a EE 1 13 1 10 SPACE Mmm 1 13 2 1 Visual GMECKING D fc nee 2 1 5 1 Series 3000 T31P Indicator Housing amp Internal
2. OHAUS SERVICE MANUAL 3000 Senes 131 Indicators Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 973 377 9000 OHAUS SERVICE MANUAL 3000 Senes T31 Indicators T31P amp T31XW 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 CHAPTER 1 GETTING STARTED Page No ed dee EE 1 1 L2 gt ee res 1 1 1 3 Tools and Test Equipment Required E 1 2 1 3 1 Special Tools and Test Equipment et 1 2 1 3 2 Standard Tools and Test Equipment ei 1 2 1 4 SPECHCAUONS UU Ue 1 3 1 5 Hardware Selup or RI e EE 1 4 1 51 Jumper Connections HI 1 4 E 1 5 120 SO ET Ut 1 6 Sc NEE Ge EE 1 6 lef Overview OF ihe Contool S en eh 1 6 1 721 POWEr OM er 1 7 OW Remp EE 1 7 LZS MOM 1 8 1 8 Scale Setup amp Galibration EE 1 9 1 8 1 Geographical Adjustment Fachor nenne nennen nennen nennen 1 9 1 82 UM 1 10 S3 Eineany EE E 1 10 1 9 9523
3. Iumnanana Ss ZEN 0 02 005 01 5 10 15 20 25 30 40 50 60 75 100 EX 120 00100200501 00200501 5 10 15 20 25 30 40 50 60 75 100 120 ma 150 001 002 00 01 00501 5 10 15 20 25 30 40 50 60 75 100 120 150 200 001 002 005 01 02 10050102 15 10 15 20 25 30 40 50 60 75 100 120 150 200 100 200 0 05 0 1 02 0 05 0 1 02 5 10 15 20 25 30 40 50 60 75 100 120 150 200 250 300 002 0 05 01 02 0 05 0 1 02 5 10 15 20 25 30 40 50 60 75 100 120 150 200 150 300 250 300 0 02 0 05 0 1 02 0 1 02 5 10 15 20 25 30 40 50 60 75 100 120 150 200 200 400 250 300 400 0 05 0 1 02 05 0 1 02 05 5 10 15 20 25 30 40 50 60 75 100 120 150 200 0 05 0 1 02 05 0 1 02 0 5 5 10 15 20 25 30 40 50 60 75 100 120 150 200 300 600 750 005 0 1 0 2 0 5 02 05 5 10 15 20 25 30 40 50 60 75 100 120 150 200 300 750 250 300 400 500 600 750 1000 0 05 0 1 0 2 0 5 1 02 051 5 10 15 20 25 30 40 50 60 75 100 120 150 200 500 1000 250 300 400 500 600 750 1000 0 1 02 05 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 0 1 02 05 1 05 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 0 1 0 2 0 5 1 2 05 12 5 10 15 20 25 30 4
4. 5 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 See chart below for visual checking procedures CRACKED REPLACE TOP COVER TOP COVER CRACKED REPLACE BOTTOM COVER BOTTOM COVER M CRACKED REPLACE ASSEMBLE INERAT MAIN PC BOARD MAIN PC BOARD AND TEST RS232 CONNECTOR REPLACE PINS BROKEN RS232 CONNECTOR LCD DISPLAY PARTIALLY LIT OR BLACKENED VERIFY IF TOP REPLACE PANEL SWITCHES SUBSTITUTE PANEL OR MAIN PC TOP PANEL OR NON FUNCTIONAL TOP COVER BOARD IS BAD MAIN PC BOARD Figure 2 1 Visual Checking Procedures REPLACE MAIN PC BOARD 3000 Series T31 Indicators Service Manual 2 1 Ohaus Corporation www ohaus com CHAPTER 2 TROUBLESHOOTING 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 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 they appear 4 Perform the indicated checks or
5. gt Indicators Service Manual Oo Oo Om Om SP B 1 CO Oo Oo Om Om O Oo Om Om PS AOO Oo Oo Om Om FB BWW N 0 325 650 975 1300 1625 1950 2275 2600 2925 3250 325 650 975 1300 1625 1950 2275 2600 2925 3250 3575 Elevation above sea level in feet 1060 2130 3200 4260 5330 6400 7460 8530 9600 10660 1060 2130 3200 4260 5330 6400 7460 8530 9600 10660 11730 5 4 4 3 3 2 2 OO Om Om SS Go GO b i Oo Oo Om Om SS OONN gt ONN OO Om Om amp P Go Go h h A aO Oo Oo Om Om amp A OONN 2 OO CH Ohaus Corporation www ohaus com APPENDIX B GEOGRAPHICAL ADJUSTMENT VALUES TABLE B 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 1060 2130 3200 4260 5330 6400 7460 8530 9600 10660 minutes 1060 2130 3200 4260 5330 6400 7460 8530 9600 10660 11730 23 22 22 21 21 20 20 19 19 18 18 o0 02 57 04 57 04 58 17 98 17 59 32 59 32 60 49 60 49 62 09 62 09 63 30 63 30 64 55
6. 3000 Series T31 Indicator Service Manual 1 13 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED Ohaus Corporation www ohaus com 1 14 3000 Series T31 Indicator Service Manual CHAPTER 2 TROUBLESHOOTING 2 1 INTRODUCTION This section of the manual covers visual inspection of the Indicator troubleshooting and a Diagnostic Guide Table 2 1 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 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 2 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 3 Examine the top of the main PCB for cracks or signs of corrosion 4 fit 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
7. 64 55 66 24 66 24 67 57 67 57 69 35 69 35 71 21 71 21 73 16 73 16 75 24 15 24 77 52 77 52 80756 80 56 85 45 85 45 90 00 Ohaus Corporation www ohaus com B 2 3000 Series T31 Indicators Service Manual 8 0 2 5 2 5 9 8 P N 80252598 SERVICE MANUAL 3000 SERIES T31 INDICATORS
8. Be sure appropriate calibration masses are available before beginning calibration 2 Besure the scale base is level and stable during the entire calibration process 3 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 LFT mode again after turning it off it is necessary to have the Indicator locked and sealed by local Weights and Measures authorities 4 f the Calibration Menu is locked 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 appears Press Yes twice to exit menu mode 5 Allow the Indicator to warm up for approximately five minutes after stabilizing to room temperature 6 To abort calibration press the Exit button anytime during the calibration process 1 8 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 See Appendix B to determine the Geocode conversion factor that corresponds to your location Note Changi
9. CHAPTER 3 MAINTENANCE PROCEDURES 3 1 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 or 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 moving it from an area which is at a different temperature than the area where it is to be operated 3 1 1 Preventive Maintenance Checklist The Indicator should be inspected and checked regularly as follows 1 Unplug the AC Adapter before cleaning 2 Forthe T31P clean the outside using a cloth dampened with a mild detergent 3 Forthe T31XW use approved cleaning solutions for the stainless steel Indicator housing and rinse with water CAUTION N DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE S FINISH 4 Check the Power Cord for broken or damaged insulation 5 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 Indicator is still non functional and no other information on the subject is available in the manual contact Ohau
10. Figure 1 1 Remove the four screws from the PCB and on the T31XW the grounding cable screwed to the PCB near the Keyboard connector CAUTION When handling the PCB grasp it by the edges only Do not touch the foil side Static discharge may damage some components Lift out the PCB Carefully re position the replacement PCB over the screw holes in the Top Cover Re insert and tighten the screws 10 Reconnect the Cable Sets removed in Steps 4 6 11 Perform calibration procedures See Section 1 8 12 Perform testing procedures See Chapter 4 Ohaus Corporation www ohaus com 3 2 3000 Series T31 Indicators Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 2 2 Cable Set Replacement Note The cables that connect the PCB to the Load Cell connector the RS232 connector the AC power outlet and in the case of the T31P the Lead Acid Battery are all sold as a single set Replace them singly or together as follows de 2 3 Open the Housing Disconnect the cables from any of the connectors RS232 Load Cell AC outlet for which the cable set is to be replaced In the case of the T31P s battery remove the quick connect tabs that hold the cables in place Reconnect the wires to the PCB 3 2 3 Function Label amp Membrane Switch Replacement 1 On the T31XW open the Housing and disconnect the plastic ribbon cable that connects the Membrane Switch to the PCB Carefully remove the old Function La
11. Manual 1 4 SPECIFICATIONS CHAPTER 1 GETTING STARTED TABLE 1 1 SPECIFICATIONS Capacity Range Maximum Displayed Resolution Approved Resolution Maximum Avg Piece Weight Weighing Units Functions Display Backlight Keypad Ingress Protection Load Cell Excitation Voltage Load Cell Drive Load Cell Input Sensitivity otabilization Time Auto Zero Tracking Zeroing Range opan Calibration Interface Overall Dimensions W x D x H in mm Net Weight Ib kg Shipping Weight Ib kg Operating Temperature Range Power T31P T31XW 5 to 20 000 kg or Ib 1 20 000 1 in 2 5 cm digit height 6 digit 7 segment 1 5 in 8 8 cm high x 4 9 in 12 5 cm wide backlit LCD 4 button membrane switches se Off 0 5 1 or 3 divisions 2 or 100 of capacity 5 kg or 5 Ib to 100 capacity 8 3 x 2 8 x 5 8 210 x 1 x 168 212x 71x 149 10 C to 40 14 F to 104 F 9 12 VDC 0 5A AC Adapter Internal rechargeable Sealed Lead Acid Battery 100 hour typical life T31P 100 240 VAC 50 60 Hz Internal Power Supply T31XW 3000 Series T31 Indicator Service Manual 1 3 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 5 HARDWARE SETUP OR DISASSEMBLY Both the T31P and T31XW 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
12. 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 The process of opening the Housing varies slightly for each model T31P T31XW 1 Remove the four Phillips head screws 1 Remove the four hex head screws from from the rear housing the rear housing 2 Open the housing being careful not to 2 Open the housing by carefully pulling disturb the internal connections the top of the front housing forward Below is a diagram of the T31 s Main PCB with connectors jumpers terminals and switches indicated The Load Cell Cable connects to Terminal Block J5 Membrane Switch connector LFT On Off T31XW only Switch 34 OFF A Load Cell Sense Terminal J5 Jumper W2 RS232 Sense Terminal J7 Jumper W1 J5 T31XW only Eeer i Terminal J6 T31P only T31P only Figure 1 1 Printed Circuit Board PCB T31 Indicator 1 5 1 Jumper Connections For a 4 wire load cell with no sense wires short Jumpers W2 and W3 For a 6 wire load cell that includes sense wires open Jumpers W2 and W3 For load cells with an extra ground shield wire connect the shield to the center position GND NSN Bin Connection EPPES EES E p Excitation Sense J5 3 Signal SENS GND SENS Jo Signal J5 6 Sense J5 7 Excitation Figure 1 2 L
13. 0 50 60 75 100 120 150 200 250 300 400 500 600 750 1000 1200 1500 2000 3000 Series T31 Indicators Service Manual 1 Ohaus Corporation www ohaus com 1000 2000 APPENDIX A SETUP amp CALIBRATION VALUES 05 12 5 7500 05 1 2 5 me vi 5 1 2 5 10 20 LA 5 10 20 2 3000 Series T31 Indicators Service Manual A 2 Ohaus Corporation www ohaus com APPENDIX B GEOGRAPHICAL ADJUSTMENT VALUES from the equator North or South in degrees and minutes 0 00 5 46 5 46 9 52 9 52 12 44 12 44 15 06 15 06 17 10 17 10 19 02 19 02 20 45 20 45 22 22 22 22 23 54 23 54 25 21 25 21 26 45 26 45 28 06 28 06 29 25 29 25 30 41 30 41 31 56 31 56 33 09 33 09 34 21 34 21 35 31 35 31 36 41 36 41 37 50 37 50 38 58 38 58 40 05 40 05 41 12 41 12 42 19 42 19 43 26 43 26 44 32 44 32 45 38 45 38 46 45 46 45 47 51 47 51 48 58 48 58 50 06 50 06 51 13 91 13 52 22 92 22 53 31 93 31 54 41 54 41 55 52 3000 Series T31 APPENDIX B GEOGRAPHICAL ADJUSTMENT VALUES TABLE B 1 GEQGRAPHICAL ADJUSTMENT VALUES Elevation above sea level in meters Geographical latitude away rd DO CI O d NOOO CI d OO
14. 2 Ee 1 11 1 9 1 Setting Communications Parameters nennen nnennnn nenne 1 11 1 92 Interface Commands EE 1 12 CO 1 12 TNO Be OF KEE 1 13 CHAPTER 2 TROUBLESHOOTING 1 iei EU E 2 1 2 2 Te Ee e n EE T 2 1 25 Diagnose oT 2 2 221 Ree EE 2 2 CHAPTER 3 MAINTENANCE PROCEDURES S PREVENTING sariro ee 3 1 3 1 1 Preventive Maintenance Checklist nennen nnnnnneennnnnnnn 3 1 3 2 Replacement of Major Components nennen 3 1 3 2 1 Printed Circuit Board PCB Replacement nennen nennen nenne 3 2 32 2 leet Replacement 2 Eed 3 3 3 2 3 Function Label amp Membrane Switch Heplacement Rennen 3 3 3 2 4 Power Supply Replacement nn nennen nennen nennen 3 4 329 Battery e Le EEN 3 5 CHAPTER 4 TESTING Scho STESING E Eed 4 1 4 2 KEE 4 1 4 3 Performance Tests Using a Scale 4 1 4 3 1 Increasing Decreasing Load Test 4 2 4 3 2 Overoad Underload tesa 4 2 4 4 Performance Tests Using a Load Cell 4 2 45 Galibration EC e e EE 4 2 4 6 RS232 Interface Test Print Test 4 2 Ohaus Corporation www ohaus com 3000 Series T31 Indicators Service Manual TABLE OF CONTENTS CHAPTER 5 PARTS LISTS amp DIAGRAMS Page No 5 1 3000 Series T31P Indicator Housing amp Internal Parts
15. 5 2 5 1 Series 3000 T31XW Indicator Housing amp Internal Parts 5 4 3000 Series T31 Indicators Service Manual ji Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 4 INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus T31 Indicators 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 hardware setup or disassembly operating the Indicator scale setup and calibration and configuring the Indicator s communication and Legal for Trade menus 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 T31 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 Shou
16. Indicator Service Manual 1 11 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 9 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 P Print stable displayed weight according to stability sg 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 129 2 kg 3 lb 4 0z 5 Ib 0z 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 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 9 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 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 st
17. SING amp INTERNAL PARTS TABLE 5 1 T31P INDICATOR HOUSING amp INTERNAL PARTS Bormo ooo 10 Bottom Housing 11 Knobs Set of 2 12 Wall Mount Kit Wall Mout Kit 000000 13 14 18 19 2 3000 Series T31 Indicator Service Manual 5 3 Ohaus Corporation www ohaus com CHAPTER 5 PARTSLISTS amp DIAGRAMS 5 2 3000 SERIES T31XW INDICATOR HOUSING amp INTERNAL PARTS 5 Figure 5 1 Series 3000 T31XW Indicator Housing amp Internal Parts Ohaus Corporation www ohaus com 5 4 3000 Series T31 Indicator Service Manual CHAPTER 5 PARTS LISTS amp DIAGRAMS 5 1 3000 SERIES T31XW INDICATOR HOUSING amp INTERNAL PARTS TABLE 5 1 T31XW INDICATOR HOUSING amp INTERNAL PARTS Power Supply Cover 3000 Series T31 Indicator Service Manual 5 5 Ohaus Corporation www ohaus com CHAPTER 5 PARTSLISTS amp DIAGRAMS Ohaus Corporation www ohaus com 5 6 3000 Series T31 Indicator Service Manual APPENDIX A SETUP amp CALIBRATION VALUES APPENDIX A SETUP amp CALIBRATION VALUES TABLE A 1 SETUP amp CALIBRATION VALUES Graduation size with Graduation size A 0 0005 0 001 0 002 0 001 0 002 0 005 5 E 5 0 005 0 0005 0 001 0 002 0 002 0 005 0 01 5 10 5 0 005 0 01 15 0 001 0 002 0 005 0 01 0 005 0 01 5 10 15 ll 0 01 0 02 m 4 nxeoxsomor omo osason m4 _ 5 nxsomomoB mann smiz2340 on _
18. able Legend up to 3 characters G gross weight NET net weight T tare Ohaus Corporation www ohaus com 1 12 3000 Series T31 Indicator Service Manual CHAPTER 1 GETTING STARTED 1 10 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 E Press and hold TARE Menu until C A L appears then press No 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 abovementioned menus 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 Figure 1 9 T31XW Wire Seal Figure 1 10 T31XW Paper Seal
19. bel or Membrane Switch It is held in place with a strong adhesive Clean the Top Cover and remove all traces of adhesive Remove the protective backing from the back of the new Function Label or Membrane Switch Carefully position it on the Top Housing starting at the bottom of the cover Use a rolling motion to smooth it into position On the T31XW connect the plastic ribbon cable that connects the Membrane Switch to the PCB Close the Housing if opened previously re insert and tighten the four screws previously removed Perform calibration procedures See Section 1 8 Perform testing procedures See Chapter 4 3000 Series T31 Indicators Service Manual 3 3 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES 3 2 4 Power Supply Replacement T31XW Only 9 10 11 12 13 14 19 16 17 18 19 20 21 22 2 Unplug the Indicator from the power source Remove the four screws from the Bottom Housing and separate the Top Housing and Bottom Housing Pull the white tab plug that connects the power cord to the 3 post receptacle on the side of the Power Supply Remove the screws that secure the Power Supply Cover and lift it off Pull the white tab plug that connects the Power Supply to the PCB Remove the screw holding the grounding wire from the white plug to the Power Supply s base Lift out the Power Supply Position the replacement Power Supply wi
20. d 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 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 occur each time stability criteria are met ON StAB or at a defined interval INtEr or continuously CONt 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 3000 Series T31
21. dicates 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 3000 Series T31 Indicators Service Manual 4 1 Ohaus Corporation www ohaus com CHAPTER 4 TESTING 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 and observe the display The display should indicate Error 8 2 Release the platform The display should return to zero N 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 1 Remove the mass from the scale base The display should return to zero 4 4 Performance Tests Using a Load Cell Simulator A sim
22. ill display Lo BAT and automatically turn off when the battery is fully discharged 1 7 OVERVIEW OF THE CONTROLS Stability symbol Capacity label window 7 segment 6 digit LCD display Kilogram Pound amp Center of Zero Ounce symbols Battery PCs TARE indicators Battery only BO Moda Control Buttons on T31P CS gt b Figure 1 6 T31 Display Ohaus Corporation www ohaus com 1 6 3000 Series T31 Indicator Service Manual 1 7 OVERVIEW OF THE CONTROLS Primary Function Short Press Secondary Function Long Press Menu Function Short Press 1 7 1 CHAPTER 1 GETTING STARTED TABLE 1 2 FUNCTIONS OF DISPLAY CONTROLS ON ZERO Off Yes ON ZERO Turns the Indicator on Off Turns the Indicator off Yes Accepts the current setting on the display Power ON PRINT Sends the current value to the COM port if AUTOPRINT is set to Off Units Changes the weighing unit No Advances to the next menu or menu item Rejects the current setting on the display and advances to the next available setting Increments the value 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 TARE Performs a tare operation Menu Enter the User menu Exit Exits the User menu Aborts a calibration in p
23. ld 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 e Must be free of air currents or drafts from air conditioning heating ducts open windows people walking by fans 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 3000 Series T31 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 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 Series T31 Indicator Service
24. ll components of the indicator The descriptions in this manual refer to the names of the components identified in the exploded view drawing with the numbered callout 1 6 1 Power Supply The T31XW has an Internal Universal Power Supply 100 240 VAC 50 60 Hz and plugs into a standard properly grounded electrical outlet Power to the T31P indicator is supplied by a 9 12 V dc 500mA Power Adapter or by a 6V 5Ah internally rechargeable sealed lead acid battery The indicator will automatically switch to battery operation if there is a power failure or the power cord is removed NOTE N Before using the T31P Indicator for the first time the battery should be fully charged for up to 12 hours The Indicator can be operated during the charging process The battery is protected against over charging and the Indicator can remain connected to the AC power line Connect AC power to the indicator and allow it to charge While the battery is charging the triangle above the battery function symbol will light When the battery is fully charged this triangle will disappear The indicator can operate up to 100 hours on a fully charged battery It automatically enters standby mode after one minute of no activity During battery operation a flashing triangle above the battery function symbol indicates the battery is low and requires recharging Approximately 60 minutes of operation will remain when the battery symbol starts to blink The indicator w
25. ndix 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 1 8 3 Linearity Calibration Linearity calibration uses three calibration points 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 The display flashes the mid calibration point Place the specified weight on the 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 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 1 10 D
26. ng the GEO 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 3000 Series T31 Indicator Service Manual 1 9 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 8 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 3U To choose a different span point press No to increment the selections or Back to decrement the selections See Appe
27. o x Q CI 3000 Series T31 Indicator Service Manual CHAPTER 1 GETTING STARTED 1 9 RS232 INTERFACE CONNECTION The T31 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 9 1 Setting Communications Parameters The T31 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 The menu toggles to the next setting each time you press No 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 No M O d E appears Press No U N I t appears Press No P r i n t appears Press Yes rESEt appears 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 an
28. oad Cell wiring Figure 1 3 Open shorted jumpers OPEN JUMPERS SHORTED JUMPER Ohaus Corporation www ohaus com 1 4 3000 Series T31 Indicator Service Manual CHAPTER 1 GETTING STARTED 1 5 2 RS232 Interface Each model T31P and T31XW has RS232 communication The T31P uses a standard 9 pin D style connector with a pin configuration as illustrated in Figure 1 5 connecting to its female counterpart on the back of the T31P Housing The T31XW has a water tight strain relief outlet on its rear panel See Figure 1 4 To connect an RS232 cable pass it through the strain relief and attach it to terminal block J7 See Figure 1 1 Re tighten the strain relief to ensure a water tight seal Strain Relief for RS232 cable Figure 1 4 Rear panel T31XW The RS232 wiring on the T31XW s Terminal J7 is labeled J7 1 TXD J7 2 RXD J7 3 GND to facilitate connecting the RS232 cable The RS232 pin configuration for the T31P is illustrated in Figure 1 5 below Pin Connection 1 N C 5 2 0 2 TXC 3 RXD 9 e 4 N C 5 GND Figure 1 5 RS232 Pins 6 9 To adjust RS232 settings see Section 1 9 page 1 11 or the Instruction Manual packed with the Indicator 3000 Series T31 Indicator Service Manual 1 5 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 6 OPERATION This section contains information on the basic operation of the Indicator An exploded view drawing is included in Chapter 5 which identifies a
29. ock switch on PCB to Off LFT menu set to On Set LFT menu to Off Battery indicator is Battery discharged Connect indicator to power and flashing T31P only chargebattery Battery fails to Battery is defective Replace battery charge fully T31P only Error 7 0 Unstable weight reading when Unstable Error check platform location defining reference weight Error 8 1 Weight reading exceeds Power Remove load from scale Recalibrate On Zero limit scale Error 8 2 Weight reading below Power On Add load to scale Recalibrate scale Zero limit Error 8 3 Weight reading exceeds Reduce load on scale Overload limit Weight reading below Underload Add load to scale Recalibrate scale limit Error 9 0 Internal fault Cycle power Replace PCB 3000 Series T31 Indicators Service Manual 2 3 Ohaus Corporation www ohaus com CHAPTER 2 TROUBLESHOOTING Error 9 5 Calibration data not present Calibrate scale Replace PCB Error 53 EEPROM data incorrect Cycle power on and off If error continues replace PCB CAL E Calibration Error Calibration Repeat calibration using correct value outside allowable limits calibration weights LOW rEF In Pieces mode the average You may continue to weigh but results piece weight of the parts is may not be accurate because average small warning piece weight is smaller than can be accurately counted Ohaus Corporation www ohaus com 2 4 3000 Series T31 Indicators Service Manual
30. ottom Housing and reconnect the Load Cell Cable to the Load Cell Connector on the Bottom Housing Perform calibration procedures See Section 1 8 Perform testing procedures See Chapter 4 3000 Series T31 Indicators Service Manual 3 5 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES Ohaus Corporation www ohaus com 3 6 3000 Series T31 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 bg Make sure the test area is free from drafts and 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 Forthe T31P first be sure the AC Adapter is functioning properly then connect it to the Indicator power plug For the T31XW check that the power cord is not damaged 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 in
31. r or computer should occur each time the button is pressed Ohaus Corporation www ohaus com 4 2 3000 Series T31 Indicators Service Manual CHAPTER 5 PARTS LISTS amp DIAGRAMS This section of the manual contains exploded views for the 3000 Series T31 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 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 please contact your local Ohaus distributor 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 3000 Series T31 Indicator Service Manual 5 1 Ohaus Corporation www ohaus com CHAPTER 5 PARTSLISTS amp DIAGRAMS 5 1 3000 SERIES T31P INDICATOR HOUSING amp INTERNAL PARTS c ON CO 8 m 8 44 10 OO C2 co 8 Figure 5 1 Series 3000 T31P Indicator Housing amp Internal Parts Ohaus Corporation www ohaus com 5 2 3000 Series T31 Indicator Service Manual CHAPTER 5 PARTS LISTS amp DIAGRAMS 5 1 3000 SERIES T31P INDICATOR HOU
32. rogress 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 3000 Series T31 Indicator Service Manual 1 7 Ohaus Corporation www ohaus com CHAPTER 1 GETTING STARTED 1 7 OVERVIEW OF THE CONTROLS 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 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 T31 MENU STRUCTURE NO 300 BAUD 9600 2 19200 EVEN H FS CAPACITY SELECT CAP OFF Se Ohaus Corporation www ohaus com 1 8 3000 Series T31 Indicator Service Manual CHAPTER 1 GETTING STARTED 1 8 SCALE SETUP amp CALIBRATION Two calibration processes are available Span Calibration and Linearity Calibration Preliminary Steps 1
33. s 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 T31 Indicators Service Manual 3 1 Ohaus Corporation www ohaus com CHAPTER 3 MAINTENANCE PROCEDURES 3 2 1 Printed Circuit Board PCB Replacement 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 for any of the following reasons Display is defective characters missing or partial display Indicator fails to calibrate properly Display is erratic or unstable Certain functions are not operational Indicator does not operate at all 1 2 3 4 Onthe T31XW Unplug the Indicator from the AC power source Remove the four screws from the Bottom Housing Carefully separate the Top Housing and Bottom Housing Remove the Keypad connector ribbon cable by pulling it out If the RS232 Interface is connected disconnect its wire leads from the PCB s RS232 Terminal Block J7 See Figure 1 1 On the T31P Disconnect the battery Pull the horizontal white tab plug connecting the RS232 Interface to the PCB s Terminal J6 See Figure 1 1 On both models Pull the white tab wire plugs connecting the PCB to the unit s power supply Disconnect the wire leads connecting the scale s load cell to the PCB s Load Cell Terminal Block J5 See
34. see the appropriate section of the manual 5 Repair or replace the defective part NOTE If more than one symptom is observed approach one area at a time and remember that the symptoms may be interrelated If a problem arises that is not covered in this manual contact Ohaus Corporation for further information Ohaus Corporation www ohaus com 2 2 3000 Series T31 Indicators Service Manual CHAPTER 2 TROUBLESHOOTING 2 2 1 Diagnosis TABLE 2 1 DIAGNOSTIC GUIDE Unit will not turn on Power cord not plugged in or Check power cord connections Make properly connected sure power cord is plugged in properly into the power outlet Power outlet not supplying Check power source electricity Battery discharged T31P only Reconnect AC power to charge the battery Cannot zero the Load on Scale exceeds Remove load on Scale Scale or will not allowable limits zero when turned on Load on Scale is not stable Wait for load to become stable Load Cell is damaged Replace Load Cell PCB is damaged Replace PCB Poor accuracy Improper calibration Perform calibration Unstable environment Move scale to suitable location Load Cell is damaged Replace Load Cell PCB is damaged Replace PCB Unable to calibrate Unstable environment Move the scale to suitable location Incorrect calibration mass Use correct calibration mass Lock Calibration Menu set to On Set Lock Calibration Menu to Off Lock switch on PCB is on Set the L
35. th the screw holes aligned Position the grounding wire over the screw hold on the right side insert the screw and tighten it Attach the white tab plug that connects the Power Supply to the PCB Carefully position the Power Supply Cover with the wires from the smaller white tab plug coming through the gap in the front Attach the white tab plug that connects the Power Supply to the AC power cord Insert and tighten the screws that secure the Power Supply Cover Re connect the Top and Bottom Housing insert and tighten the four screws Connect the Indicator to AC power and test it Ohaus Corporation www ohaus com 3 4 3000 Series T31 Indicators Service Manual CHAPTER 3 MAINTENANCE PROCEDURES 3 2 5 Battery Replacement T31P only d 2 9 10 11 12 Unplug the Indicator from the AC Adapter Remove the four screws from the Bottom Housing Carefully separate the Top Housing and Bottom Housing Remove the quick connect tabs that hold the Battery Cables in place Remove the four screws each with a washer that secure the Battery to the Bottom Housing Carefully lift away the bracket that holds the Battery in place Position the replacement Battery in the place of the old one Reposition the bracket that holds the Battery in place and insert the four screws each with a washer that secure the Battery to the Bottom Housing Insert the quick connect tabs as they were before Reassemble the Top Housing and B
36. ulator can be used in place of a scale base if available Connect the simulator to Terminal Block J5 the Load Cell terminal block on the PCB so that EX EX S4 and S are matched at each end of the cable See Figures 1 1 and 1 2 page 1 4 Test the Indicator as follows 1 Set the simulator to zero Power on the Indicator Perform a Span Calibration with zero at the simulator s zero setting and 10096 capacity at the simulator s 2 0 milli volt setting 2 Following calibration check that the Indicator s display reading is stable at each simulator level up to the maximum set in the calibration If the readings are stable the Indicator is functioning properly 4 5 Calibration Retention Test This test checks that the Indicator retains calibration after power is removed and then restored 1 Turn the Indicator OFF and disconnect the AC Adapter or power cord 2 Wait one minute then reconnect the AC Adapter or power cord to the Indicator 3 Checkto 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 9 1 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 printe

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