OHAUS MB120 Service Manual Download Page 39

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CHAPTER 3 – MAINTENANCE PROCEDURES

MB90 MB120 Series Service Manual

Ohaus Corporation www.ohaus.com

7. Remove the 3 cables, grounding

wire and 1 set of wire connected to
the control board. (See Figure 3-4.)

Note: Take note on the cable routing.

8. Lift the top housing off and set it

aside.

Figure 3-4. Three screws in Top Housing.

Remove cables and wire.

A- Cable to Lid sensor board

B- Cable to Main PCB

C- Cable to Main PCB

D- Wire to Heating chamber

E- Grounding cable

Summary of Contents for MB120

Page 1: ...SERVICE MANUAL MB90 MB120 Moisture Analyzer...

Page 2: ......

Page 3: ...pecifications 5 1 7 1 Admissible Ambient Conditions Use only in closed rooms 5 1 8 Controls 7 1 8 1 Display 8 1 9 Setup navigation 9 1 9 1 Setup screen 9 1 9 2 Weight and temperature calibration 9 1 9...

Page 4: ...AC plug 36 3 7 Replacing the control board 37 3 8 Replacing the main PCB 38 3 9 Replacing the load cell 39 3 10 Replacing the load cell accessory kit 40 3 11 Replacing the heating chamber parts 42 3 1...

Page 5: ...tore EEPROM 69 B 2 Replace Main PCB 71 B 3 Replace Control Board 74 B 4 Diagnostics 77 B 4 1 Ramp ON 78 B 4 2 Linearization Service Linearization Calibration 79 B 4 3 Span Service Span Calibration 80...

Page 6: ......

Page 7: ...e Chapter 3 Maintenance Procedures Contains preventive maintenance procedures and disassembly repair and replacement procedures Chapter 4 Final Testing Contains a list of required test masses an opera...

Page 8: ...dous situation with low risk resulting in damage to the device or the property or in loss of data or minor or medium injuries if not avoided Attention no symbol for important information about the pro...

Page 9: ...mum 30 minutes Service should only be performed by authorized personnel Use electrostatic protection measures when handling the printed circuit board Only use original replacement parts and accessorie...

Page 10: ...oltmeter DVM input impedance of min 10 megohms in 1 Volt dc position 3 Standard Electronics tool kit 4 Soldering iron 50 watt and solder rosin core solder not acid core 5 Solder remover 6 Ohaus Temper...

Page 11: ...Range 40 230 40 200 Drying Programs Standard Fast Ramp Step Standard and Fast Switch off Criteria Timed Auto 30 60 90 seconds Autofree mg s Autofree s manual Manual Time and Auto Heat Source Halogen D...

Page 12: ...necting the instrument to the power supply when switched on from standby mode the instrument is ready for operation immediately Voltage fluctuations Mains supply voltage fluctuations up to 15 10 of th...

Page 13: ...igure 1 1 MB90 MB120 Membrane Switch and Display 1 Turns On or Off display and fan 2 When pressed sends Print command 3 When pressed either starts or stops the drying process 4 When pressed performs T...

Page 14: ...and create new method 2 Test results Manage test results 3 Setup Change system settings 4 Help guide Method development guide and help information 1 2 3 4 Figure 1 2 MB120 and MB90 Display Screen But...

Page 15: ...ation The Moisture Analyzer can be calibrated with an external mass of 50 grams Calibration of the Moisture Analyzer is not absolutely necessary for a correct moisture determination as the measurement...

Page 16: ...temperature calibration button The Adjustments screen appears Press the Weight adjustment external button The display highlights the action you should take Remove the sample pan and place the require...

Page 17: ...least 30 minutes before performing calibration Note The temperature calibration kit is available as optional equipment Press Setup button on the main screen Press Weight and temperature calibration b...

Page 18: ...ver and enter this temperature Using the up down arrow buttons adjust the display reading to agree with the thermometer Use the left right arrow buttons to highlight ACCEPT NEW CAL then press the Ente...

Page 19: ...9 2 3 Last temperature calibration result Press Setup button on the main screen The Setup menu appears Press Weight and temperature calibration button The Adjustments screen appears Press the Last te...

Page 20: ...een languages available on all displays This procedure permits the selection of any language Press Setup button on the main screen The Setup menu appears Press User settings The User settings screen a...

Page 21: ...ice Manual 15 Ohaus Corporation www ohaus com 1 9 3 2 Brightness Press Setup button on the main screen The Setup menu appears Press User settings button The User settings screen appears Press Brightne...

Page 22: ...120 Series Service Manual 16 Ohaus Corporation www ohaus com 1 9 3 2 Beep Press Setup button on the main screen The Setup menu appears Press User settings button The User settings menu appears Press B...

Page 23: ...put into operation for the first time you should enter the current date and time These settings are retained even if you disconnect your instrument from the power supply A built in battery will maint...

Page 24: ...ration www ohaus com Set date format Press Back to exit Set time format Press Back to exit Set date Press and to set correct date month and year Press Set date to save it Press Back to exit Set time P...

Page 25: ...inters and computers The following sections describe the hardware and software provided with the Moisture Analyzer Press Setup button on the main screen The Setup menu appears Press Device settings bu...

Page 26: ...and 115200 Default setting is 9600 Baud Setting data bits Select the desired data bits of 7 or 8 Default setting is 8 Setting parity Select the desired parity setting of either NONE EVEN or ODD Defaul...

Page 27: ...creen The Setup menu appears Press Device settings button The Device settings menu appears Press Print settings button The Print settings menu appears Press Print results automatically to switch ON or...

Page 28: ...s com 1 9 7 Company information Press Setup button on the main screen The Setup menu appears Press Device settings button The Device menu appears Press Company Information button The Company informati...

Page 29: ...ual 23 Ohaus Corporation www ohaus com 1 9 8 User management Press Setup button on the main screen The Setup menu appears Press User Management button The Users screen appears Press New button to crea...

Page 30: ...CHAPTER 1 GETTING STARTED MB90 MB120 Series Service Manual 24 Ohaus Corporation www ohaus com Set the password Enable the password Set the password Set the user profile...

Page 31: ...Manual 25 Ohaus Corporation www ohaus com 1 10 System and data management Press Setup button on the main screen The Setup menu appears Press System and data management The System and data management...

Page 32: ...G STARTED MB90 MB120 Series Service Manual 26 Ohaus Corporation www ohaus com System backup and restore Factory reset Software update Note For the rest of the Menu navigation please kindly refer to In...

Page 33: ...signs of bending twisting or corrosion Clean the unit before evaluating any mechanical problems Remove any debris inside the Housing Check condition of Keypad and Display Dryer Unit with protective gl...

Page 34: ...eplace cable Replace main PCB include SD card and CPU Some buttons do not respond Defective keyboard Replace keyboard A new keypad overlay is needed Portions of display do not light up Defective displ...

Page 35: ...ure Analyzer on and allow it warm up for at least one hour before performing these tests Make sure the test area is free from drafts and the surface that the Moisture Analyzer rests on is level and vi...

Page 36: ...e 3 1 1 Preventive Maintenance Checklist The moisture analyzer should be inspected and checked regularly as follows 1 Remove the Pan Handler Pan Support and Draft Shield to inspect and clean the area...

Page 37: ...31 Ohaus Corporation www ohaus com To avoid electrostatic damage during production conducting floors controlled air humidity and EMC mats are used When servicing the unit it is also advisable as soon...

Page 38: ...emove the 4 foots to locate the 4 screws securing the housing in place Figure 3 2 Removing foots and screws from bottom housing Figure 3 1 MB90 120 with top open 5 Holding the housing and heating cham...

Page 39: ...wire and 1 set of wire connected to the control board See Figure 3 4 Note Take note on the cable routing 8 Lift the top housing off and set it aside Figure 3 4 Three screws in Top Housing Remove cable...

Page 40: ...ch 1 Flip the Analyzer around and locate the Power PCB compartment 2 Remove the Analyzer two back foots 3 Remove the 4 screws securing the power board compartment 4 Below show the Analyzer Power Switc...

Page 41: ...7 Replacing the Power Switch PCB by removing two cables from the PCB Locate and remove the 4 screws at 4 corners of the PCB which securing the PCB in the compartment 8 Remove the Power Switch from the...

Page 42: ...acing the AC plug 1 Open the Analyzer Power Compartment Refer to 3 4 2 Remove the two cables connected from the AC Plug to the Power Board and the Grounding wire to the Analyzer base Note Take note on...

Page 43: ...the housing 4 Remove and replace the AC Plug by shifting the plug upwards 3 7 Replacing the control board 1 Open the Analyzer Refer to 3 2 2 Detach the Top Housing 3 Locate the Control Board which is...

Page 44: ...is needed when replacing the Control Board 3 8 Replacing the main PCB 1 Open the Analyzer Refer to 3 2 2 The Main PCB is located at the Top Housing 3 Remove the cables from Main PCB to Control Board a...

Page 45: ...ard 3 9 Replacing the load cell 1 Open the Analyzer Refer to 3 2 2 Detach the Top Housing 3 Locate the Load Cell 4 Remove the Load Cell metal plate by removing the 4 screws securing the plate 5 Lift u...

Page 46: ...ing the load cell accessory kit The load cell accessory kit consist of the below Moisture adsord material 1 After removing the Load cell kit from its compartment Refer to 3 9 you will see the moisture...

Page 47: ...ing this material it is advised to let the material set for a day before performing any weight calibration to the Analyzer Load cell rubber ring 1 Open the Analyzer Refer to 3 2 2 Detach the Top Housi...

Page 48: ...the heating chamber parts 3 11 1 Opening the Heating Chamber Compartment 1 Lift up the heating chamber 2 Remove the Sample Pan Pan Handle Pan Support Draft Shield and Tray Pan 3 2 3 Remove the chambe...

Page 49: ...tion www ohaus com 3 11 1 1 Replacing the Temperature sensor 1 Remove the temperature wire from its protective sleeve 2 Detach the wire connection as show below 3 Remove the two screws holding the tem...

Page 50: ...emperature sensor cable from its protective sleeve 2 Disconnect the cable and Connect probes to the Temperature Sensor Cable s 3 Measure resistance it should be approximately 1 000 4 Open and close th...

Page 51: ...1 1 3 Replacing the Halogen Lamp 1 Open the lid 3 10 1 2 Remove the chamber glass by following the below steps Gently separate the two metal clips which securing the chamber glass in position 3 Remove...

Page 52: ...left and right and at the same time use both thumbs to lift the Halogen lamp carefully upward out of the clamping springs 6 Remove and replace a defective halogen lamp Note The two ends of the Halogen...

Page 53: ...aus com 3 11 1 4 Replacing the Thermal Overload 1 Open the lid 3 11 1 2 Remove the Temperature sensor 3 11 1 1 3 Remove the halogen lamp if necessary 3 11 1 3 4 Remove the two wires connected to the T...

Page 54: ...om the chamber housing 7 Remove and replace the Thermal Overload Note During this step care is needed to avoid breaking the Halogen lamp if the halogen lamp still attached 3 11 1 5 Installing the Ther...

Page 55: ...ad with power to the unit off use an ohm meter to measure resistance between the devise s poles Resistance should be zero If so the devise is in good working condition if not continue to step 2 2 Pres...

Page 56: ...poration www ohaus com 3 11 2 Replacing Top Housing Components 3 11 2 1 Removing the top housing cast iron plate 1 Open the Analyzer and remove the Main PCB 3 8 2 Remove the top housing cast iron plat...

Page 57: ...tion www ohaus com 3 11 2 2 Replacing the Fan 1 Open the Analyzer and remove the Main PCB 3 8 2 Remove the housing cast iron plate 3 11 2 3 Locate the Fan 4 Remove the Fan cable connected to the Lid s...

Page 58: ...ain PCB 3 8 2 Remove the housing cast iron plate 3 11 2 3 Locate the Lid sensor board 4 Remove cable from Fan and to temperature sensor remove the 3 screws holding the board is place 5 Remove and repl...

Page 59: ...Keyboard 1 Open the Analyzer and remove the Main PCB 3 8 2 Remove the housing cast iron plate 3 11 2 3 Locate the Keyboard 4 Use a broad blade such as a wide X Acto knife to remove the label Clean th...

Page 60: ...d ensure the LCD are display normal with no missing segment 4 4 Performance Tests Accurate performance is determined by a series of three performance tests Precision Off Center Load and Centered Load...

Page 61: ...d deviation of the readings is less than the indicated tolerance the Analyzer passes the Precision Test CAUTION Remove the mass from the pan after testing Adjustment If the deviation for any set of re...

Page 62: ...tely 50 grams place the sample on the center of platform Record the reading on the worksheet provided 3 Remove the sample from the platform 4 Repeat this test starting at Step 1 until you record a tot...

Page 63: ...to perform this test can be utility masses Note Due to the use of relative weighing and limited use of the weighing range in moisture analysis linearity performance is not critical Linearity Test Mas...

Page 64: ...arts for current parts lists contact your local Ohaus distributor or www ohaus com NOTE In all cases where a part is replaced the scale must be thoroughly checked after the replacement is made The sca...

Page 65: ...TER 5 PARTS IDENTIFICATION DIAGRAMS MB90 MB120 Series Service Manual 59 Ohaus Corporation www ohaus com CHAPTER 5 PARTS IDENTIFICATION DIAGRAMS 5 1 MB90 MB120 parts Figure 5 1 MB90 MB120 Housing and P...

Page 66: ...mal Overload 4 Halogen Bulb 5 Glass 6 Pan Holder 7 Pan support 8 Wind Ring 9 Tray 10 Air Channel Kit 13 Main Board 14 Key Board 15 LCD 16 Overlay 17 Load Cell 18 Load Cell Acc Kit 19 Foot 20 Base Cabl...

Page 67: ...ent is relative The balance determines the weight of the sample before and after drying and the moisture is calculated on the basis of the ratio between wet and dry weights Nevertheless you should cal...

Page 68: ...mperature calibration button to access calibration menu Press Back to return to previous step Press the Weight adjustment external button The display highlights the action you should take Follow the i...

Page 69: ...APPENDIX A STANDARD CALIBRATION MB90 MB120 Series Service Manual 63 Ohaus Corporation www ohaus com The display indicates if the calibration was successful...

Page 70: ...form this procedure If the Moisture Analyzer has been recently used allow at least 30 minutes before performing calibration Note The temperature calibration kit 11113857 is available as optional equip...

Page 71: ...temperature calibration process Follow the screen prompts throughout the process The dryer unit is heated to a temperature of 100 C You can observe the progress on the display as the dryer temperature...

Page 72: ...ure is defined by two points Proceed exactly as you did for the first temperature After you have set the display to agree with the thermometer then press the Enter button CAUTION Danger of burns Be ca...

Page 73: ...version and instructions on how to use it please follow below steps 1 Go to http dmx ohaus com and log in with your username and password 2 Go to View by product 3 Open the folder Service Software 4...

Page 74: ...INSTRUCTIONS MB90 MB120 Series Service Manual 68 Ohaus Corporation www ohaus com After selecting MB90 120 MOISTURE under Product Selection you will be able to see the below Function Selection which su...

Page 75: ...ze service person to upload and restore the scale data Information such as below will need to provide to OHAUS in order to obtain the scale eif file 1 Analyzer Model Number 2 Analyzer Serial Number 3...

Page 76: ...ation click Next You will come to Write Image File page as shown below Fill in the below and click Next to complete the Write Image File process 1 Analyzer Serial Number 2 Analyzer Load Cell Serial Nu...

Page 77: ...o perform the Replace Main PCB function Note Kindly take note at the right hand remark in RED with Picture as shown below before proceeding After powering up an Analyzer with new PC board you will see...

Page 78: ...on such as below will need to provide to OHAUS in order to obtain the scale eif file 1 Analyzer Model Number 2 Analyzer Serial Number 3 Analyzer Load Cell Serial Number Once Replace Main PCB is select...

Page 79: ...Load Cell image file eif files provided by OHAUS 5 Click Next to complete the Write Image File process Note After completing the above information when you click Next you will hear a beep sound from...

Page 80: ...e as shown below before proceeding The new Control Board will be pre loaded with the Drying firmware but to make sure the firmware is updated one needs to upload the Analyzer firmware via the USB befo...

Page 81: ...ale Serial Number 2 Model number 3 Load Cell Serial Number 4 Point to the Analyzer and load cell image file provided by OHAUS 5 Click Next to complete the Replace Control Board process Note After comp...

Page 82: ...APPENDIX B SOFTWARE SERVICE TOOL INSTRUCTIONS MB90 MB120 Series Service Manual 76 Ohaus Corporation www ohaus com...

Page 83: ...d Service and Repair Tools Once Diagnostic is selected the Com Port Configuration option will appear Complete the configuration and click Next You will see the bellow window MB90 120 Diagnostics consi...

Page 84: ...ommand 5 MB90 and MB120 support the below print command B 4 1 Ramp ON Select Ramp ON the right hand window will show the A to D conversion signal from Load cell to Main PCB Press again to terminate th...

Page 85: ...bration Selecting this function will allow the Analyzer to perform the Service Linearization calibration Follow instruction on the Analyzer display screen when selecting this function During Service L...

Page 86: ...n Calibration Selecting this function will allow the Analyzer to perform the Service Span Calibration Follow instruction on the Analyzer display screen when selecting this function During Service Span...

Page 87: ...Analyzers used the same firmware THEREFORE factory configuration will define the model of the Analyzer Since the firmware operated under MB90 and MB120 are different from the rest of OHAUS products th...

Page 88: ...e files inside folder MB90_120_SR1 xx into your thumb drive you will have total 9 files 2 Insert the thumb drive into either one of the USB Host located at the back of the Analyzer 3 Switch ON the pow...

Page 89: ...ound 30 sec to complete and during the process the Analyzer will have a onetime Auto Boot 6 When you see the below screen only you remove the thumb drive and RE BOOT the Analyzer to complete the firmw...

Page 90: ...SN30284476E_1 10 5 Press the Update then pop out the confirm information Press the Update for the software installation 6 Update procedure takes about 5 10 minutes During this time there will be blank...

Page 91: ...software is used for software corrupt issue Obtain Analyzer firmware from DMX as below 1 Un zip ClearSR zip as below copy all the 3 files in an empty Thumb drive 2 Plug the Thump drive into the back...

Page 92: ...e the Image file upload and follow by Service Lin and Span calibration to complete the whole process Perform Temp calibration if necessary Note Once you had performed this action in an MB120 the Analy...

Page 93: ...by following the below instruction 1 Obtain MB120 Password Reset from DMX as below Under MB90 and MB120 Moisture Analyzer folder User Software You will locate the file name MB120 Password Reset zip f...

Page 94: ...to either one of the USB Host located at the back of the Analyzer 3 Switch ON the power during power up the Analyzer will indicate the presence of the thumb drive and starts to locate the Autorun file...

Page 95: ...ANALYZER FIRMWARE MB90 MB120 Series Service Manual 89 Ohaus Corporation www ohaus com 5 Remove the thump drive and RE BOOT The Analyzer after rebooting will then show the screen below after a success...

Page 96: ...demark of Ohaus Corporation 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...

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