OHAUS TROOPER SCALE, Service Manual

Page 1: ...haus Corporation Ohaus Corporation Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 USA www ohaus com Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 973 377 9000 TROOPER SCALE SERVICE MANUAL ...

Page 2: ......

Page 3: ...duc tion of this material is strictly prohibited Material in this manual is subject to change Copyright 2001 Ohaus Corporation all rights reserved Registered trademark of Ohaus Corporation SERVICE MANUAL Trooper Scale Ohaus Corporation Ohaus Corporation Ohaus Corporation Ohaus Corporation Ohaus Corporation 19A Chapin Road P O Box 2033 Pine Brook NJ 07058 2033 USA www ohaus com ...

Page 4: ......

Page 5: ...D Display Information 2 2 2 3 7 Display On Off 2 2 2 3 8 A D Converter 2 2 2 3 9 Load Cell Excitation Voltage 2 2 2 3 10 RS232 Operation 2 2 CHAPTER 3 TROUBLESHOOTING 3 1 Troubleshooting 3 1 3 2 Diagnostic Guide 3 1 3 2 1 Diagnosis 3 1 3 3 Error Codes 3 3 CHAPTER 4 MAINTENANCE PROCEDURES 4 1 Preventive Maintenance 4 1 4 1 1 Preventive Maintenance Checklist 4 1 4 2 Testing 4 1 4 2 1 Operational Tes...

Page 6: ...y Test 4 11 4 2 8 RS232 Interface Test 4 13 4 2 8 1 Connecting the RS232 Interface 4 13 4 2 9 Print Test 4 14 4 3 Repair Procedures 4 15 4 3 1 Replacing the Keypad Membrane 4 15 4 3 2 Replacing the PC Board 4 16 4 3 3 Replacing the Spider Assembly Loadcell 4 18 CHAPTER 5 DRAWINGS AND PARTS LISTS 5 1 Drawings and Parts Lists 5 1 5 1 1 Trooper Exploded View 5 2 TABLE OF CONTENTS Cont CHAPTER 4 MAINT...

Page 7: ...5 3 LIST OF ILLUSTRATIONS FIGURE NO TITLE PAGE NO 2 1 Trooper Block Diagram 2 3 4 1 Segment Displays 4 1 4 2 Trooper Scale Menu 4 2 4 3 Lock Switch Location 4 9 4 4 Sealing the Scale with a Lead Seal 4 9 4 5 Sealing the Scale with a Paper Seal 4 9 4 6 Off Center Load Test mass Locations 4 11 4 7 RS232 Interface Pin Connections 4 13 4 8 Connector Locations 4 16 4 9 RS Connector and Loadcell Connect...

Page 8: ...iv ...

Page 9: ...ch press advances horizontally through the menus Finalizes a menu selection 8 Tarebutton When pressed enters tare value into memory 9 G N T Menubutton Recalls Gross Net Tare Long press allows entry into menus When in menus advances through individual menu items 10 kg LCD indicator when lit indicates weight in kilograms g LCD indicator when lit indicates weight in grams 11 lb LCD indicator when lit...

Page 10: ...oper Scales capacities 3kg 6kg 15kg and 30kg The contents of this manual is contained in five chapters Chapter 1 Introduction Contains information regarding service facilities tools and test equipment test masses and specifications Chapter 2 Theory of Operation Contains a basic information on circuit and loadcell operation Chapter 3 Troubleshooting Contains a diagnosis diagnostics chart and error ...

Page 11: ... 1 Volt dc position 2 Standard Electronics tool kit 1 5 TEST MASSES REQUIRED The masses required to test the Ohaus Trooper Scales must meet the requirements of ASTM Class 4 Tolerance The mass values are listed in Table 1 1 TABLE 1 1 TROOPER CALIBRATION MASSES Cal in kg Span cal choices Linearity cal fixed TR3RS 1 2 3kg 2 3 kg TR6RS 2 4 6kg 4 6 kg TR15RS 5 10 15kg 10 15 kg TR30RS 10 20 30kg 20 30 k...

Page 12: ...lastichousing Protection IP43 Operating Temperature 14 F to 104 F 10 C to 40 C Storage Temperature 40 F to 140 F 20 C to 60 C Standard Models TR3RS TR6RS TR15RS TR30RS Default Capacity X Readability lb 6lb X 0 001lb 15lb X 0 002lb 30lb X 0 005lb 60lb X 0 01lb Default Capacity X Readability kg 3kg X 0 0005kg 6kg X 0 001kg 15kg X 0 002kg 30kg X 0 005kg Default Capacity X Readability g 3000g X 0 5g 6...

Page 13: ... beam it bends at the hinged areas The bending changes the resistance of the Strain Gauges and the resulting resistance output from the Wheatstone bridge is proportional to the load Six Down Stop screws which are part of the upper Spider Assembly engages and limits the external load at slightly over full load capacity and limits the bending of the beam preventing damage due to overloading The Spid...

Page 14: ...mation for the LCD comes directly from microprocessor U7 and is decoded with it s internal circuits The LCD is backlit by panel BL1 and driver circuitry BL2 operated from BKLIT signal from microprocessor U7 2 3 7 Display ON OFF The unit contains an ON OFF button There is a power save mode in the software When this feature is enabled the scale will automatically turn off after 5 minutes after last ...

Page 15: ...T MONITOR 5V BATTERY VOLTAGE JUMP2 JUMP1 1 2 3 4 5 7 6 INPUT ANALOG L C J4 SEN EXC SIG MSCLK MCE MSDI MSDO SKM A D EXC CGND SIG SEN CONVERTER MFG TEST RS232 OUTPUT 5 4 LOWBAT TXD RXD 5V DC GND LOWBAT J1 1 2 3 EEDI EEDO EECE EECK EEPROM 1024BIT BEEPER BUZZER BEEPER DRIVER 1 2 3 J10 GND TXD1 RXD1 RXD TXD RS232 DRIVER BKLIT BACK LIGHT DRIVER EL PANEL LCD DISPLAY SEG15 COM1 SEG1 COM4 U1 U11 BL2 BL1 U3...

Page 16: ...2 4 CHAPTER 2 THEORY OF OPERATION ...

Page 17: ...l to familiarize yourself with the scale components and operation Do not attempt repairs unless you fully understand the operation of the scale 3 2 1 Diagnosis 1 Isolate and identify the symptom 2 Refer to Table 3 1 Diagnostic guide and locate the symptom 3 Follow the suggested remedies in the order that they appear 4 Perform the indicated checks or see the appropriate section of the manual 5 Repa...

Page 18: ...ch Remove load on scale to less than entered zero Change allowable zero in ZERO parameter of Setup menu Normal operation when this feature is disabled Remove disturbances or reduce motion Increase AZT level in read out menu Increase averaging level in readout menu Enable desired unit in Readout menu Conversion too large typi cally in g PROBABLE CAUSE S Adapternotpluggedinorprop erly connected Batt...

Page 19: ...urs When a problem occurs using the scale the display will indicate an error code Review the listed codes and follow instructions to correct the problem Table 3 2 Error Codes describes the various error codes which can appear on the display and specifies the probable reason and remedy TABLE 3 2 ERROR CODES Indication Problem LoBat Isindicatedwhenbatteriesareweak Approximately20minutesofoperatingti...

Page 20: ...3 4 CHAPTER 3 TROUBLESHOOTING ...

Page 21: ...rm and inspect and clean the area beneath the Platform Remove any accumulated dirt or dust 2 Clean the outside of the scale using a damp cloth with water CAUTION DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE FINISH OF THE SCALE 3 Check the Power Cord for broken or damaged insulation 4 Make a visual inspection for faulty connectors wiring and loo...

Page 22: ...6789012345678901212345678901234567890 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890 12345678901...

Page 23: ... Gross Net Tare if tare value is stored Noactionfor5secs scaledisplayreturnstoNET Long press Enter MENU TARE Short press enter TARE BUTTONS PRIMARY FUNCTION SECONDARY FUNCTION 4 2 4 Trooper Scale Menu Operation This section describes the menu operation The menu permits matching the scale to specific weighing needs In the menu you can change the settings of the scale and activate functions The Main...

Page 24: ...s For best results calibrate at full capacity Calibration unit can be set to either kg or lb NOTE When the Scale is used in Legal for trade applications the calibration menu is locked out and is not accessable This is to prevent unauthorized personnel from changing calibration IMPORTANT Before beginning calibration make sure masses are available If you begin calibration and realize calibration mas...

Page 25: ...d Press the PRINT UNITS button to scroll through the choices until LCLOFF appears Press the G N T MENU button repeatedly until the scale returns to weighing Before calibrating make sure that you have the correct masses available 4 2 5 Calibration Cont Cal in kg Span cal choices Linearity cal fixed TR3RS 1 2 3kg 2 3 kg TR6RS 2 4 6kg 4 6 kg TR15RS 5 10 15kg 10 15 kg TR30RS 10 20 30kg 20 30 kg Cal in...

Page 26: ...splayed Gross Brutto kg kg Place the indicated mass on the platform Keep the platform stable during this period The sample illustration indicates a 15kg scale If at this point you are uncertain of the process or if the correct weights are not available the calibra tionroutinecanbeabortedbypressingthePRINT UNITS button or by turning the scale off by press ing and holding the ON ZERO OFF button Pres...

Page 27: ...ease it and SETuP appears if alreadyin the main menu skip to the next step Repeatedly press the PRINT UNITS button until LOCSW is displayed Repeatedly press the G N T MENU button until LCLOFF is displayed Press the PRINT UNITS button to scroll through the choices until LCLON appears Press the G N T MENU button repeatedly until the scale returns to weighing The scale is now ready for weighing ...

Page 28: ...ity calibration for Trooper is 0 2 3 and full capacity Place the indicated mass on the platform Keep the platform stable during this period Press G N T MENU button C is displayed The scale MUST be stable during this period and is establishing a zero point After a few seconds the display flashes FULLCP and the requested weight value is displayed Place the indicated mass on the platform and press th...

Page 29: ...k Switch Location Replace the Lock Switch cover and housing screw cover The two screws are cross drilled and can accept a wire seal NOTICE The Trooper Scale has been tested and found to comply with Class lll requirements of NIST Handbook 44 After the Scale has been tested and found to comply with local applicable regulations by a local weights and measures official it may be sealed as follows LEAD...

Page 30: ...le operation before and after repairs Each scale tested must meet the requirements specified in each test as well as the specifications listed in Tables 1 2 and 1 3 depending upon the model Before proceeding with the following tests all the procedures starting with paragraph 4 2 must have been accomplished on the scale first 4 2 7 1 Repeatabilty Test To conduct a Repeatability Test proceed as foll...

Page 31: ... each reading Figure 4 6 Off Center Load Test Mass Locations 4 2 7 3 Linearity Test The Linearity test is used to determine the linearity of the scale throughout its operating range and is in accordance with the specifications listed in Tables 1 2 and 1 3 NOTE The scale must pass the Off Center Load test and Repeatability Test before the Linearity Test is performed This test is used to determine t...

Page 32: ...xactvalue alldecimal places displayed 2 Removethereferencemassandverifythatthedisplayreturnstozero Ifitdoesnot disregard the reading press ON ZERO OFF to rezero the display and take that reading again See note above 3 Place Load 1 on the center of the Platform and press ON ZERO OFF 4 Add the reference mass to the Platform and record the exact value displayed 5 Removethereferencemassandverifythatth...

Page 33: ... set to accommodate external printersorcomputers Itcontainseightsubmenus Reset BaudRate ParityBit DataBits StopBits AutoPrint Interval Stable andsavesettingswhichenableyoutoprogramRS232port parameters Refer to Print menu and make sure all communications parameters are properly set 4 2 8 1 Connecting the RS232 Interface When the interface is connected to a computer two way communication between the...

Page 34: ...nvalid command response ES error indicates the scale has not recogonized the command Commands sent to the scale must be terminated with a line feed LF or carriage return line line feed CRLF Data output by the scale is always terminated with a carriage return line feed CRLF 4 2 8 1 Connecting the RS232 Interface Cont Command Character Description Print current mode kg g lb oz P Same as pressing PRI...

Page 35: ...ix screws which hold the upper housing CAUTION Use care in the next step as the keypad wiring is attached to the PC board 4 Turn the scale over again to its normal upright position and carefully lift the upper housing from the bottom housing about two to three inches Reach under the upper housing from the front and carefully disconnect the flexible cable from the PC board 5 On the upper housing li...

Page 36: ...r on it s bottom and remove the six screws which hold the upper housing CAUTION Use care in the next step as the keypad wiring is attached to the PC board 4 Turn the scale over again to its normal upright position and carefully lift the upper housing from the bottom housing about two to three inches Reach under the upper housing from the front and carefully disconnect the flexible cable from the P...

Page 37: ... on the PC Board 8 Replace the PC Board and install the four screws previously removed 9 Replace the color coded wiring for connectors J4 and J10 Check color coded wiring is correctly installed 10 Replace the connectors to J6 and J7 on the PC Board 11 Position the upper housing in place over the scale and connect the flexible cable from the keypad to the socket on the PC board 12 Reassemble the sc...

Page 38: ...under the upper housing from the front and carefully disconnect the flexible cable from the PC board 5 Carefully remove the wires coming from J4 which is used to connect to the loadcell See figure 4 9 for wire color and locations 6 Remove the four screws holding the Spider Assembly to the bottom housing 7 Lift the Spider Assembly out of the bottom housing and replace with a new one 9 Connect the c...

Page 39: ...re 4 10 Trooper Component Locations J6 J10 J1 J5A S1 DC POWER JACK RS232 CONNECTOR BATTERY BOX LOADCELL PC BOARD LED DISPLAY FERRITE CORE BATTERY BOX POWER CONNECTOR CABLES LOADCELL CABLE RS232 CABLE KEYPAD CONNECTOR LOCK SWITCH SPIDER ASSEMBLY ...

Page 40: ...4 20 CHAPTER 4 MAINTENANCE PROCEDURES ...

Page 41: ... cases where a part is replaced the scale must be thoroughly checked after the replacement is made The scale MUST meet the parameters of all applicable specifi cations in this manual If further technical information is needed in the United States call toll free 1 800 526 0659 between 8 00 a m and 4 00 p m EST An Ohaus factory service technician will be available to provide assistance Outside the U...

Page 42: ... 5 DRAWINGS AND PARTS LISTS Figure 5 1 Exploded View of Trooper Scale 20 20 19 19 3 3 18 18 21 21 16 16 15 15 22 22 17 17 12 12 13 13 14 14 10 10 8 8 11 11 9 9 6 6 7 7 4 4 5 5 2 2 11 1 5 1 1 Trooper Exploded View ...

Page 43: ...ll Assembly 30kg With Frame 1 7 71134281 Assembly main PCB Trooper 1 8 Screw M4x6 2 9 Screw M3x8 2 10 Washer Dia 3mm 2 11 71121101 Nut DS026AS 1 12 71102619 Nut M3 GB6170 86 2 13 71133660 Harness PWR COM Trooper 1 14 71133035 Bottom Housing Trooper 1 15 71133036 Cover Battery Trooper 1 16 71127394 Reed l CD11 1 17 71127396 Reed ll CD11 1 18 71133155 Cover sealing Trooper 2 19 71127395 Reed llI CD1...

Page 44: ... 3 2 1 KBD Overlay 6 5kg 15kg 30kg 40kg Red 3 4 White 5 6 Orange Green 7 1 71134281 White 2 3 J10 Black 2 3 1 Black Red J7 1 2 Red J6 4 Main Trooper Red Harness PWR COM RS232 1 2 3 4 5 3 TEST Black J1 Adaptor Input Batt Holder 2 J5A Figure 5 2 Trooper Scale Interconnection Diagram KEYBOARD OUTPUT Print Units G N T Menu On Zero Off Tare Figure 5 3 Keypad Wiring Diagram ...

Page 45: ......

Page 46: ...SERVICE MANUAL TROOPER SCALES P N 80250901 ...