Service Manual for Electronic Precision Balances series
Contents
1. 434 SH e 9710 72 434 SH e 9710 73 il aati PRIT 434 SH e 9710 74 75 434 SH e 97102. 26 Initialisation of EEPROM 39 27 Linearity Adjusting 40 27 Linearity Adjusting Procedure 27 2 Adjusting Masses Chart 28 Span Adjusting _ 40 41 42 28 Adjusting Masses Chart 28 2 Adjusting Mass Tolerance Collection 28 3 Disable the Span Adjusting Function 42 44 46 46 29 Cornerload Adjustment 29 1 Cornerload Adjustment Masses 30 Electronic Fault Finding 46 48 30 1 Power Check 30 2 EEPROM Check 30 3 Voltage Check 31 Electronic Fault Finding Charts 48 48 49 50 32 Wave Form Check 55 33 RS 232C Interface 57 33 1 Interface Specifications 33 2 Output Format 33 3 Output Data Mode 33 4 External Control Commands 33 5 Cabling Diagrams 34 Installation of the Air Shield Case OMJ 2 Option 35 Troubleshooting 57 59 60 _ 61 62 63 64 36 KERN 434 Series Parts List 68 37 Balance drawings 434 SH e 9710 Fehler Textmarke nicht definiert 1 Specifications KERN 434 23 KERN 434 33 KERN 434 37 Pounce 0x00005 180 0005 109x00005 Pound Q6x0 000005 1 1 x 0 000005 68x 0 000005 Momme 82x00005 96x0 0005 826x00005 Exe 09 9 percent displa y display Dimensions 194 W x334 D x81 Hmm Options Auxiliary display OMK 0 Underweighing hook OMJ 1 Air shield case OMJ 2 Animal weighing pan OMJ 3 Small animal weighing pan OMJ 4 Auxiliary display base stand OMJ 10 Dust cover OMJ 1 1 Auxiliary display sta
3. 434 SH e 9710 5 Best Conditions for Weighing 1 Never turn off the power switch or disconnect the AC adapter when in use 2 When making a measurement always place the sample in the centre of the weighing pan Slight errors may result if the sample is not near the centre of the pan 3 Make sure the balance is level by using the level vial and the adjustable feet on the bottom 4 Install the balance in a controlled environment A The weighing room should be kept clean dry and free of cigarette smoke B Protect the balance from drafts air currents Use a draft shield if necessary C Maintain the ambient temperature to 3 C D Maintain the ambient humidity to 10 E If larger changes in temperature or humidity occur re calibrate the balance F The balance table should be level and free from excessive vibration Corners of rooms are less prone to vibration G Do not expose the balance to direct sunlight or radiated heat Keep away from windows heaters hot plates flames fans air conditioners etc H Allow hot or cold sample containers to come to ambient temperature before weighing I Discharge any statically charged sample before weighing J Do not expose the balance to corrosive gases 5 Magnetised samples cannot be weighed accurately on an electronic balance Keep equipment containing magnets away from the balance 6 Make certain that the AC power supply is free from electrical disturbances 7
4. Service Manual for Electronic Precision Balances series KERN 434 Version 1 0 7 97 434 SH e 9710 Table of Contents 1 Specifications 4 2 Introduction 5 3 Principles of operation 5 4 Block Diagram 6 5 Best Conditions for Weighing 7 6 Balance Functions 8 7 Description of Function Menu 9 8 Description of Functions 10 9 Weighing Unit Initialisation 11 9 1 Keyboard Method 11 9 Parameter Number Chart 12 10 Piece Counting Mode 13 10 1 Removing establishment of the standard unit weight for piece counting 14 11 Percent Mode 15 11 1 Weighing Mixture Mode 15 12 Adjusting Introduction 17 13 Inner A D Counter Check Mode 19 14 Disassembly Assembly 21 14 4 Removing the Top Case 21 14 2 Removing the Mechanical Unit 22 14 3 Mechanical Unit Disassembly 23 14 4 Assembly 24 15 Jig Set 25 16 Additional Disassembly Assembly 26 16 1 Replacement of the Force Coil Bobbin 26 16 2 Cleaning Inside the Magnet 26 16 3 Positioning Edge of the Beam Inside the Photo Sensor 27 17 Primary Checking Procedure 28 18 Visual Check 28 19 Mechanical Fault Finding 29 19 1 All Segment Lines or No Display 29 19 2 Unstable Weighing Results Adjustment 30 20 Mechanical Fault Finding Chart 32 21 Short Wire Check 33 22 Connecting Cable Check 34 2 434 SH e 9710 23 Plate Bearing Coupling Link Check 35 24 Beam Stopper Adjustment 36 25 A D Converter Check 38
5. If the display shows a Lo message when pressing the TARE key the unit weight of the sample pieces is less than the balance can detect The minimum weight of each sample piece required to establish piece counting is as follows KERN 434 23 KERN 434 33 KERN 434 37 434 SH e 9710 0 01 9 0 01 9 0 19 10 1 Removing establishment of the standard unit weight for piece counting This unique function of the KERN 434 series is used to easily increase the number of pieces of sample used as your piece counting standard without taking the time to count out each standard sample separately This is important because the greater the number of sample pieces used to set your standard the more accurate an precise your piece counting will be Step 1 Establish the standard number of sample pieces and unit weight at 5 PCS for example by following the procedure on the previous page Step 2 Place 15 more sample pieces on the weighing pan The display will show that there are 20 pieces on the pan Step 3 Leave the 20 pieces on the weighing pan and press the F key until 20 PCS appears on the display Step 4 Press the Tare key to memorise the new number of sample pieces and the new unit weight Step 5 Follow the same procedure to increase the standard to 100 or 1000 pieces Note The key is to let the balance do the counting for you when establishing the standard For example count out 20 pieces by yourself and set the standard
6. command made only after the balance has stabilised After print command 2 made output as soon as balance has stabilised Data Output upon print OUT Transmission command regard Note 4 Mode less of stability Automatic output as 4 soon as balance has stabilised Automatic output 5 regardless of stability STb 2 Note 1 Interface 7E1 7 bit Even parity 8N1 Note 5 eri al aa RS 232 C Interface 1 2 Note 5 Speed Mode Auto Start Auto start is on Mode Auto start is off OFF Note 6 10 434 SH e 9710 9 Weighing Unit Initialisation 9 1 Keyboard Method Step 1 Make certain that AST function mode Automatic start is off A S T cu f Step 2 To have the count down display once disconnect the AC adapter cord and reconnect it again Step 3 Press and hold the TARE U and F keys at the same time when 999999999 111111111 appears Step 4 Release the keys when the All E COUNT DOWN Segment line appears l 1 Step 5 Parameter number will appear after All Segment line has stopped flashing Step 6 Two units in addition to grams can be selected and programmed into memory Grams will automatically be in memory and does not need to be selected in this procedure Unit 1 is selected by pressing the U key until the unit code place Unit 2 is selected by pressing the TARE key until the unit does appear on the display in the Unit 2 digit place For example if you s
7. then reattach the weight M2 6x5 screw 26 Initialisation of EEPROM This procedure is necessary only when a complete loss of memory has occurred A loss of memory can occur from a component replacement short circuit or other electronic problem To successfully complete this procedure you will need to initialise the RAM do a Linearity Adjusting and a Span Adjusting You may also need to do a Temperature Compensation Adjusting Step 1 Readjust the Linearity Adjusting see Linearity Adjusting page 41 Step 2 Readjust the Span Adjusting see Span Adjusting page 43 434 SH e 9710 39 27 Linearity Adjusting The purpose of Linearity Adjusting is to create a straight line from Zero to the Full Capacity Scale Value so that the balance will display accurate weighing results at all values in between For this adjusting procedure please use a high quality non magnetic metric stainless steel Standard Mass that is OIML Class F2 or better Whenever Linearity Adjusting is performed on the balance it must be followed by a Span Adjusting 27 1 Linearity Adjusting Procedure Qo et Laren sn ABE E STU 40 Step 1 The balance should be fully warmed up plugged in for 30 minutes and all of the Best Conditions for Weighing page 7 should be met Step 2 With the power switch OFF reset Dip Switch 2 amp 3 to the Check 3 Mode Step 3 Turn the power switch ON while pressing the F key The current A D convert value wi
8. II The piece counting amp percent weighing marks are being displayed 33 3 Output Data Mode Out 1 Transmits one data upon the print command when the balance is stabilised Step 1 Place a sample on the weighing pan Step 2 Allow reading to stabilise Step 3 Press the P key The balance will output one data Out 2 Transmits one data upon the print command as soon as the balance has stabilised Step 1 Place a sample on the weighing pan Step 2 Press the P key The balance will output one data as soon as the reading has stabilised 60 434 SH e 9710 Out 3 Transmits one data upon the print command even if the balance has not stabilised Step 1 Place a sample on the weighing pan Step 2 Press the P key The balance will output one data even if the reading has not stabilised Out 4 Automatically transmits one data when the balance has stabilised Step 1 Place a sample on the weighing pan Step 2 When the reading stabilises the balance will automatically output one data without pressing the P key Step 3 Remove the sample and place another sample on the pan Step 4 The balance will automatically output another data after the reading has stabilised Out 5 Automatically transmits all data regardless of whether the balance has stabilised or not Step 1 Place a sample on the weighing pan The balance will automatically output all data 33 4 External Control Commands The command ASCII will be transmitt
9. PLUG POWER CORD AGAIN REMEDY Malfunction of IC on 5V leading wire REMEDY 2 Malfunction of IC which is installed on 5Y leading wire of other circuit 50 434 SH e 9710 434 SH e 9710 Is it 12V at No 3 4 of CNL connector Disconnect all cables beside CN1 connector cable on MJ 1 circuit beard REMEDY REMEDY Malfunction of IC s which is Malfunction of IC s which is installed on 12V leadin installed on 12V leading wire s of other circuit boards sire s Is it 12V at No 5 6 pins of Ni connector Disconnect all cables beside CN1 connector cable of MJ 1 cirucit board 51 Is it 12V at No 5 6 pins of CXL connector REMEDY REMEDY Malfunction of IC s which is Malfunction of IC s which is ratae on 12V leading wire installed on 12Y leading wire other circuit b Reconnect the cable Is it 0 K at check point 157 REMEDY Malfunction of ZD Zena Diode REMEDY Malfunction of ICL 0P AWP REMEDY Malfunction of IC2 Trl Tr2 REMEDY Malfunction of IC6 Quarz 52 434 SH e 9710 REMEDY Malfunction of Tr7 Tr8 Tr9 Is it 0 K at TEST POINT TP2 REMEDY board Malfunction of IC3 MJ 5 circuit Is it 0 K at TEST POINT TR1 REMEDY Walfunction of IC3 IC4 YES Is it 0 K at CHECK POINT 11Ct REMEDY Malfunction of IC6 j YES Is it 0 K at CHECK POINT 4C REMEDY Malfunction of Tr13 Trl4 Tr15 YES Is it 0 K at CHECK POINT 9C 10C Y
10. absolute values ignore or signs of the display readings at Point and Point and determine which is the greater deviation from zero The side that is greater must be adjusted first For example if you get results similar to those left then Point must be adjusted Step 13 Make the adjustment by slightly turning the appropriate Adjustment Screw shown left with a box driver Screw B to adjust Point G result and Screw A to adjust Point result When the result is positive like the Point above turn the screw counter clockwise When negative turn clockwise Step 14 Repeat Steps 7 to 13 until both Point O and display zero 3 deviations Step 15 Place the mass at Point and push the TARE key Check Points to and to as diagonal to be certain that they are all at Zero 3 deviations 47 30 Electronic Fault Finding The following procedures are used to detect and repair damage to the Electronic Unit Before proceeding with any of the repair procedures below it is advisable to make a thorough visual check of the Electronic Unit Look for dirt or other foreign objects throughout the balance Check for objects touching the circuitry broken circuit paths grounding solder dry joints or any other damage to the P C Boards 30 1 Power Check Fuse If the fuse 0 5 AMP keeps blowing there is a short circuit Check the circuitry for touching objects Also check the power supply electr
11. are primarily 3 major checking procedures that should be followed in order until the damage is detected and corrected 1 Visual Check page 28 2 Mechanical Fault Finding page 29 3 Electronic Fault Finding page 49 Most repair problems that you will encounter will be a result of damage to the Mechanical unit during transport or rough usage Occasionally you will also encounter problems resulting from damage to the Electronic Unit Please carefully read the Disassembly Assembly section on page 21 24 before going through the repair procedure 18 Visual Check A careful Visual Check should always be performed before attempting further repairs If damage is detected during the Visual Check replace the damaged unit Step 1 Balance Case and Chassis There should be no cracks or gaps in the balance housing Check that all housing screws are in place Step 2 Keyboard They keyboard pad should be free of cracks or tears Step 3 Weighing Pan The weighing pan and pan support should be free of dents or bends and should be parallel to the balance case Step 4 Level Vial The level should be filled with fluid and the leveling bubble should be within the circle at the top Use the adjustable feet to level the balance Step 5 RS 232C Interface Check for any damage including dirt in the connectors 28 434 SH e 9710 19 Mechanical Fault Finding This section provides a simple fault finding method when checking a balance
12. are shifting the straight line generated during Linearity Adjusting by giving it the Zero Load Value and the full capacity adjusting mass value as reference points see Span Adjusting page 43 CALIBRATION WEIGHT LINEARITY LINE a SPAN DRIFT LINE SPAN CALIBRATION 100 000g DISPLAY 434 SH e 9710 17 Temperature Compensation Adjusting The KERN 434 Mechanical Unit operates by a force coil moving inside a permanent magnet A change in ambient temperature causes a change in the temperature of the Mechanical Unit in turn altering the characteristics of the magnet Unless this is compensated for it will cause sensitivity drift problems KERN 434 balances use a transistor temperature sensor in the Mechanical Unit to detect changes in temperature The temperature compensation settings which match the temperature characteristics of the Mechanical Unit sensor are stored in Electronic Erasable Programmable Read Only Memory EEPROM All KERN 434 series balances undergo a Temperature Compensation Adjusting at the factory before shipment At that time all temperature compensations settings are programmed into EEPROM Therefore it is not necessary to perform this adjusting regularly to avoid sensitivity drift problems EEPROM If the EEPROM is lost due to a component replacement or short circuit all adjusting data is cleared If this happens the EEPROM must be reinitialised Reinitialisations of the EEPROM must always be followed by Linea
13. at 20 pieces Use the piece counting mode to count up to 100 pieces and set the new standard at 100 pieces Then use the piece counting mode again to count up to 1000 pieces and set the new standard again at 1000 pieces 14 434 SH e 9710 11 Percent Mode Target weight Step 1 Continuously press the U key until 9o appears Step 2 Place a sample of the ideal 10096 weight on the weighing pan Step 3 Press the F key to memorise the 10096 weight Make certain that sign appears when entering a sample Press the TARE key if the sign does not appear Step 4 Percent mode procedure is complete when 100 00 appears Proceed with percent weighing by placing a new sample on the weighing pan Percentage display is 100 00 amp for KERN 434 23 KERN 434 33 and KERN 434 37 The minimum weight of the 10096 sample required to establish percent weighing is as follows KERN 434 23 T 1g KERN 434 33 ft 1g KERN 434 37 f 10g 11 1 Weighing Mixture Mode This mode is used when you want to mix two sample together For instance when you add sample B to sample A to make a 100 mixture sample 434 SH e 9710 Sample B 40 6 Sample A 60 6 15 Step 1 First memorise sample A to be the 100 weight by using the percent mode procedure above Step 2 Reset sample A at 60 weight by pressing the Uand Pkeys Step 3 Add sample B to sample A until the 100 weight is reached 16 434 SH e 9710 12 Adjusting Intr
14. emitted by the LED The balance then feeds the Force Coil Bobbin with more voltage which increases the magnetic power and pulls the Bobbin downward until the light reaching the Photo Sensor is once again equal to the light emitted by the LED This is accomplished by a Differential Amplifier a filter and an Analogue Digital A D Converter receiving photo current from the Photo Sensor converting it to voltage and boosting it back to the Force Coil Bobbin The electrical current flowing through the Force Coil Bobbin generates a voltage proportional to the load weight on the pan This is read back through the Differential Amplifier and filter then the A D Converter digitalises this voltage The resulting value is then counted and fed to the microprocessor CPU The CPU performs a multitude of commands and mathematical operations in conjunction with parameter and adjusting information stored in Random Access Memory RAM Finally the results are displayed on the Liquid Crystal Display LCD or sent to the RS 232 C Interface 434 SH e 9710 5 4 Block Diagram Place Bearing MJ 5 P C B MJ 14 C 8 MJ 4 P C 8 R 232C TARE MJ 3 P C 3 Photo Sensor LM Differential Anplifier Circuit Integral Calculation Circuit Photo Sensor Constant Voltage Circuit Output Data Circuit Perce Coil Tenperature Sensor Conjunction Circuit Differential Amplifier Circuic Comparator Circuit TeQuency Divider Circuit
15. for Mechanical Unit damage When mechanical damage is present there are two major problems that can occur when the power switch is turned on First the display may show only a decimal point with a polarity sign all segment lines message or no display at all The second problem is when the display shows and unstable weighing result 19 1 All Segment Lines or No Display The procedure below is designed to fix a balance that shows the following displays when the power switch is turned on Only a decimal point and or sign g g g 8 8 g All Segment Lines No Display Step 1 Make certain that the Short Wires are correctly soldered page 33 Step 2 Make certain that all Connecting Cables are completely connected page 21 Step 3 Make certain that all Plate Bearings and the Coupling Link are not damaged twisted or broken page 35 Step 4 Reprogram the Linearity into EEPROM by doing a Linearity Adjusting page 41 434 SH e 9710 29 Step 5 Return to the normal weighing mode by setting Dip Switch 2 to Check 0 Mode and make certain that the three error messages above are gone and that the balance shows a correct weighing display If not check all circuit boards Step 6 f the display shows an unstable weighing result proceed to the Unstable Weighing Results Adjustment procedure on page 30 Step 7 f the display shows a stable weighing reading the problem has been corrected Do a Span Adjust
16. 114 120114 120114 409 Beam plate bearing 2 2112166 2112166 211214 414 Beam extension piece 1 210239 210239 210239 415 Extension piece spacer 1 210470 210470 210470 419 Short wire silver 3 113107 113107 113107 420 Photo sensor board 1 120113 120113 120113 429 Suspension spring 1 210717 210717 210718 431 Coupling link 1 211204 211204 211205 432 Lower parallel guide 1 210507 210507 210509 434 Corner adjustment spring 2 210715 210715 210715 435 Corner adjust screw B 2 210467 210467 210467 436 Corner adjust screw A 2 210466 210466 210466 437 Beam stopper spring 1 210716 210716 210716 438 Beam stopper 1 241011 241011 241011 440 Force coil bobbin 1 251506 251506 251506 441 Beam counter weight 0 3 210473 210473 210473 444 Plate bearing spacer 16 210472 434 SH e 9710 69 No Description Qty 434 23 434 33 434 37 447 Temperature sensor cable 1 123015 123015 123015 448 Balance weight 1 211634 211634 211634 451 Coupling link spacer 2 210398 210398 210398 453 Transducer shield lower 1 240397 240397 240397 500 434 series complete jig set 1 310102 310102 310102 501 Force coil jig 1 502 Beam jig 2 503 Suspension jig 2 505 Left positioning jig 1 506 Right positioning jig 1 507 Beam stopper jig 1 70 434 SH e 9710 37 Balance drawings 434 SH e 9710 71
17. 2 Temperature sensor cable 1 123015 123015 123015 303 Power cable 1 123009 123009 123009 304 Display board 1 130109 2 130110 2 130111 2 305 Display board guide 2 210815 210815 210815 306 Display board cable 1 123010 123010 123010 307 Photo sensor cable 1 123011 123011 123011 308 Main circuit board 1 130109 1 130110 1 130111 1 310 Case shaft 1 210463 210463 210463 311 Bed 1 240103 240103 240103 312 Adjustable legs 2 210809 210809 210809 68 434 SH e 9710 No Description Qty 434 23 434 33 434 37 315 Underweighing cap 2 210813 210813 210813 317 Circuit board stand A 2 210464 210464 210464 318 Circuit board stand B 2 210465 210465 210465 319 Spirit level washer 1 211106 211106 211106 320 Spirit level 1 211121 211121 211121 322 Data output board 1 130109 4 130110 4 130111 4 323 Rear socket plate right 1 210329 210329 210329 325 Data output cable 1 123009 123009 123009 326 Power circuit board 1 130109 3 130110 3 130111 3 327 Rear socket plate left 1 210330 210330 210330 329 Top case 1 210812 210812 210812 330 Spirit level window 1 211010 211010 211010 402 Transducer shield upper 1 210328 210328 210328 403 Magnet cover 1 240332 240332 240332 404 Upper parallel guide 1 210506 210506 210508 405 Parallel plate bearing 8 211214 211214 211215 407 Force coil board 1 120
18. B KERN 434 23 300 g 200 g KERN 434 33 500 g 300 g KERN 434 37 3000 g 2000 g Step 1 The balance should be fully warmed up plugged in for 30 minutes and all of the Best Conditions for Weighing page 7 should be met Step 2 Reset Dip Switch 2 to the Check 0 Mode normal weighing Step 3 Continuously press the F key C L until CAL appears on the display Step 4 Press the TARE key Allow that CAL 0 appears on the display Step 5 Press the TARE key The balance C A L 0 automatically sets Zero Do not disturb the balance when pressing the TARE key 434 SH e 9710 In case of KERN 434 37 CAL 3000 L 4 CAL 2000 434 SH e 9710 Step 6 The balanced will then request the appropriate size adjusting masses Carefully place the adjusting masses on the weighing pan Step 7 Press the U key Step 8 It is better to place an adequate adjusting mass A size as same as a full capacity value However if unfortunately you have limited numbers of the adjusting mass then choose this secondary procedure as follows the adjusting mass B size Step 9 PASS appears on the display when adjusting is complete 43 28 2 Adjusting Mass Tolerance Collection If users desire to request for you to readjust KERN 434 balances by standard masses it is common to know that Standard Masses have always been certified with an exact tolerance by your local Measurement Authority then readjust the span of the K
19. Clean the balance with a damp cloth only no solvents 8 Always warm up the balance before use or leave on Stand by display off overnight 9 Always handle the balance with care during use or when moving or storing 434 SH e 9710 7 6 Balance Functions Sampling Time Function SAP The SAP function allows the balance to adapt to the surrounding environmental conditions The SAP should be adjusted to a small value for corresponds to the integration time in seconds that the balance is using to display readings Stability Indicator Function STb All KERN 434 series balances use the star H symbol to indicate stability When the H appears on the display the balance has not yet stabilised When the H disappears from the display the balance is stable The weight reading should be made only after the H has disappeared from the display and the indicator on the display for different sample types and weighing conditions Small values for STb require very stable conditions before the H disappears from the display and large values allow the H to disappear under more reliable conditions such as animal weighing Adjusting Cal The Cal function is used to perform a Span Adjusting on the balance See Span Adjusting page 35 for the steps required for this procedure Weighing Unit Selection Uni The Uni function is used to select and lock in different weighing units Uni 1 locks in grams or another unit and prevents switching between units U
20. ERN 434 balances with this exact tolerance as follows the below additional procedures CAL 12 GAL 230 44 Step 1 Continuously press the F key until CAL appears on the display Step 2 Press the U key Allow the deviation number appear on the display Proceed to readjust a deviation value as calculation of programmed adjusting value true value of the standard mass For instance in case of KERN 434 37 programmed adjusting value is 2000 00 g and true value of the standard mass is 1999 85 g you have to round off the numeric figures below than 1 mg readings The deviation is 0 15 g equal to programmed deviation 15 Step 3 Press continuously the U key for resetting the deviation value Maximum setting value is up to 25 deviation value Step 4 lf setting value is 15 then press the P key Minus polarity will appear on the display for resetting negative values Step 5 Press the TARE key for this setting Allow CAL 0 to appear on the display Then this procedure is complete Follow the same steps of the span adjusting procedure 434 SH e 9710 28 3 Disable the Span Adjusting Function If the user does not require to have the adjusting function on KERN 434 balances then simply reset a combination of the dip switches to disable this function Dip Switch 1 2 3 4 v v v Off Step 1 Open the top case and allow A D counter has been set to be Check 0 Mode see Inner A C Counter Check Mo
21. ES 434 SH e 9710 53 Is it 0 K at CHECK POINT 1C 54 434 SH e 9710 32 Wave Form Check If everything is correct in the Electronic Fault Finding Chart but the displayed value is still incorrect then either the CPU the EEPROM or the SCA is at fault We will be able to tell by the wave form that is generated during testing See the Wave Form Table for the testing points If an incorrect wave form is found then replace the unit that is the generator of the signal We recommend to use an oscilloscope measuring capacity more than DC 100 MHz and a digital tester readability is 0 1 uA P C B No Location Pinpoint No Wave Form IC 10 pin 3 IC 10 pin 5 CN 4 pin 12 CN 4 pin13 CN 4 pin 11 IC 11 pin 4 IC 11 pin 3 IC 11 pin2 Resistor 37 Resistor 38 IC 13 pin 2 Transistor 14 434 SH e 9710 55 IC 13 pin 3 IC 12 pin 7 IC 12 pin 14 IC 12 pin 8 ud Ea E 5C 6C C 8C 12C 2 7 2 1A A 3A 4A 5A n Condenser 7 Diode 1 Diode 2 56 434 SH e 9710 33 RS 232 C Interface The data transmission RS 232 C Interface allows the user to use KERN 434 balances in conjunction with a computer printer or other peripheral device The Interface circuit is already mounted in the balance as a standard accessory Please read the following section and the instruction manuals of related equipment before using this device The RS 232 C Interface is designed for exclusive use on KERN Balances and peripheral equipm
22. d insert the right and left positioning jigs in the mechanical unit base Step 4 Mount the suspension assembly on the right and left positioning jigs Step 5 Gently mount the beam assembly on the mechanical unit Step 6 Insert the force coil bobbin jig into the force coil bobbin Step 7 Make certain that the force coil bobbin is completely positioned to have an even space between outer rim of the bobbin and the magnet inside Then tighten the screws for fixing in between the force coil bobbin and the beam And an edge of the beam will be positioned in right space inside the photo sensor Step 8 Reattach the beam and the suspension jigs by tightening the screws Step 9 Resolder the short wire and insert to tighten the beam stopper with the beam stopper jig Step 10 Make certain to tighten the screws that the beam stopper will be installed at an proper height with the beam stopper jig Step 11 Proceed steps of the disassembly then removing the mechanical unit and then removing the top case in reverse order to be complete 434 SH e 9710 15 Jig Set You should never attempt to replace Plate Bearings or disassemble the Mechanical Unit without first attaching the appropriate KERN 434 Jig Set Even slight movements or shifts in the Mechanical Unit components can seriously hamper the performance and accuracy of the balance The Jig Set s primary purpose therefore is to secure the Mechanical Unit to prevent such mo
23. de page 19 Step 2 Reset No 4 of the dip switch has to be ON 434 SH e 9710 45 29 Cornerload Adjustment Since the weighing pan is connected to the balance through one central point as you move away from the centre toward the outer rim of the pan mechanical distortions can occur thus reducing the balance s accuracy Cornerload Adjustment is performed to compensate for the problem Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 The balance must be fully warmed up plugged in for 30 minutes before starting Remove the top case see Disassembly Assembly page 21 24 Replace the weighing pan Make certain that the balance is level Plug the AC adapter into the power source Press the ON OFF key to get a normal weighing display Check 0 Mode Place the appropriate Cornerload Adjustment Mass in the centre of the weighing pan Point Place it around the pan When using the draft shield make certain that it does not touch the pan 29 1 Cornerload Adjustment Masses me oem KERN 434 23 150g KERN 434 33 250g KERN 434 37 1500 g Step 8 Step 9 46 Press the TARE key Move the Cornerload Mass to Point and make a note of the display reading 434 SH e 9710 0 012 8 Q POINT RESULT G POINT RESULT 434 SH e 9710 BC 19 X DRIVER om Step 11 Move the Cornerload Mass to Point and make a note of the display reading Step 12 Compare the
24. dition for effection or by vibration which the balance of any vibration or air caused by somebody araft walking near the balance Vibration caused by Replace the balance machine operation or car somewhere in stable moving outside condition and on anti vibration table 2 Unstable installation Surface of the balance of the balance table is not completely flat 434 SH e 9710 67 36 KERN 434 Series Parts List No Description Qty 434 23 434 33 434 37 101 Pan holder type 1 1 325013 325013 102 Packing cushion left 1 325010 325010 325010 103 Outer packing case 1 325009 325009 325009 104 Packing cushion right 1 325011 325011 325011 105 Shipping lock spacer 1 211013 211013 106 Shipping lock 1 240232 240232 240232 108 Pan holder type 2 1 ae a 325014 109 AC adapter box 1 325012 325012 325012 111 AC adapter 220 240 V 1 122107 122107 122107 201 Weighing pan 1 230205 230205 ES 203 Pan support 1 240210 240210 se 204 Pan support peg 1 240405 240405 205 Weighing pan 1 se ris 210202 207 Pan support 1 2E p 240246 208 Pan support peg 1 240406 211 Dust ring 1 240238 240238 240238 212 Dust cover 1 210906 210906 210906 213 Hook connection 1 210712 210712 210712 214 Underweighing hook 1 210712 210712 210712 301 Panel keyboard 1 121945 121945 121945 30
25. ed into the balance through the miniature connector No 3 pin when pressing the appropriate code on the peripheral keyboard pm Functions the same as pressing the P key Functions the same as pressing the TARE key O GENEN Functions the same as pressing the U key Functions the same as pressing the F key 434 SH e 9710 61 33 5 Cabling Diagrams For connecting a computer or a peripheral device to the balance 62 SG DF RD BALANCE Pin No 1 2 PERIPHERAL Pin No a I ELE l 2 FG SD RD RS CS DR SG 434 SH e 9710 34 Installation of the Air Shield Case OMJ 2 Option We recommend the installation of an air shield case whenever your operation will be held under unstable weighing conditions 434 SH e 9710 Aishield case Screw Airshield underponel Remove the weighing pan and the pan support from the balance Loosen the 4 screws on lop of the balance case Remove the dust ring from the top case Install the Air Shield Case by placing it squarely on the top of the balance Replace the dust ring on top of the air shield under panel Replace only the 2 outside screws and tighten them snugly into place Replace the weighing pan and the pan support 63 35 Troubleshooting A No display when 1 Problem with check AC adapter malfunction plug AC adapter into point 4A 5A voltage Blown fuse power on MJ 3 P C B Power Jack JK Before checking mu
26. elect Units F and E as shown below the balance will show weighing results in Piece Counting and Percent Step 7 Press the F key to store your selections Check to make certain the desired units have been stored by pressing the U key When the unit selection Uni is set at Uni 2 you can switch between units by pressing the U key The Uni 1 setting locks in one unit and switching to another unit is not possible Select the Select the desired desired unit 1 by unit 2 by pressing pressing the U key the U key 434 SH e 9710 11 Step 8 Press the F key to complete the Unit Selection procedure Display Circular gt Press the U key Gram display Unit 1 gt Unit 2 gt Gram display fe 9 2 Parameter Number Chart o em s 9 9w Www te Tanta pa eine ae f rongona 3 efem fm meeenm ome Dr memes 3 ema 8 H Factory setting 12 434 SH e 9710 10 Piece Counting Mode Step 1 Press the U key to switch the display to Piece Counting Mode see Weighing Unit Initialisation page 11 Step 2 Press the F key until the desired count value is displayed 5 20 100 or 1000 pcs Step 3 Count out the same number of sample pieces as you selected in Step 2 and place them on the weighing pan Step 4 Press the TARE key to memorise the number of sample pieces and their unit weight The display will flash until the balance has memorised this data Step 5 Proceed with piece counting Step 6
27. ent designed by or recommended by KERN amp Sohn GmbH Use of this Interface with any other type of equipment is solely the responsibility of the user 33 1 Interface Specifications Method Half Duplex Transmission Speed 1200 2400 4800 BPS System Asynchronous system 8 bit length non parity 1 Start bit 1 Stop bit 7 bit length even parity 1 Start bit 1 Stop bit 434 SH e 9710 57 Inside the balance cane SG Signal Ground gt l2 SDISend Date RD Receive Data RST Request to Send ES v 6 Or Print Switch DIR Data Terminal Ready Configuration of Receptacle pins Plug Circle Type Miniature connector TCP8580 Type Receptacle Circle Type Miniature connector TCS75850 01 101 434 SH e 9710 58 33 2 Output Format 1 Method 2 ee ENEE 9 characters decimal point inclusive Polarity Unit Total 14 characters Unit Il Space or unit Unit Il Non stable data g Gram amp other units 2 Example data output Gram weighing lsle le jo ojoj gente Percent weighing i dgrle op porej jsonur Piece counting 434 SH e 9710 59 3 Example data output Gram weighing The other weighing units 4 There will be no output when the balance is under following conditions II The function data is being displayed II All segments display is on II The adjusting mark is being displayed II The stand by mark is being displayed
28. ic power required for the Beam to reach equilibrium when a sample is placed on the Weighing Pan Step 1 Remove the top cover see Disassembly Assembly page 21 Step 2 Check the Short Wire to make sure that it is securely soldered Step 3 f the Short Wire is disconnected then resolder When resoldering maintain contact with the soldering iron for only 1 second to avoid melting the wire SHORT WIRE 434 SH e 9710 33 22 Connecting Cable Check Step 1 Remove the top cover see Disassembly Assembly page 21 Step 2 Check all Cables for damage Take special notice of all bending parts and Cable Connectors Step 3 Make certain that all Connecting Cables are properly connected Cables should be checked in the order given in the illustration below 34 434 SH e 9710 23 Plate Bearing Coupling Link Check To replace Plate Bearings or Coupling Links you must have the Jig Set used exclusively on KERN 434 series balances Do not attempt to disassemble the Mechanical Unit or replace Plate Bearings without the appropriate Jig Set Please read the Disassembly Assembly and Jig Set sections page 25 before attempting the steps below Step 1 Remove the Mechanical Unit from the base unit Step 2 Check all Plate Bearings and the Coupling Link for bending breakage or other damage Step 3 f replacement is required install the appropriate KERN 434 Jig Set on the Mechanical Unit Make certain that the Jig Set has been prope
29. ing page 43 before beginning to weigh 19 2 Unstable Weighing Results Adjustment The procedure below is designed to fix a balance that shows unstable weighing results after the power switch has been turned on Fox example when a 100 g sample is placed on the KERN 434 23 and the display shows a reading that rapidly shifts from one reading to another the following adjustment must be made to bring the display back to a stable reading of 100 00 g Step 1 Make certain that all Plate Bearings and the Coupling Link are not damaged twisted or broken page 35 Step 2 Adjust the Inner A D Counter page 19 Step 3 Adjust the corner error by doing a Cornerload Adjustment page 47 48 Step 4 Reprogram the Linearity into EEPROM by doing a Linearity Adjusting page 41 Step 5 Do a Span Adjusting page 43 30 434 SH e 9710 Step 6 f the problem has been corrected the balance will display a Pass message If a Pass message does not appear check all circuit boards 434 SH e 9710 31 20 Mechanical Fault Finding Chart DISPLAY SHOULD iS THE DISPLAY READING STABLE CHECK Cex CONNECTING CALBLES PLATE GEARINGS COUPLING LINK ND i SHORT WIRE TEMPERATURE COMPENSATION CALIBRATION 32 434 SH e 9710 21 Short Wire Check The Short Wire two wires is used to conduct electronic current from the Photo Sensor to the Force Coil Bobbin The voltage that reaches the Bobbin via the Short Wires provides the magnet
30. ll appear on the display Step 4 Press the TARE key for proceeding the procedure steps Allow that Lin CAL appears on the display Step 5 Press the TARE key Allow that ZEro appears on the display Step 6 Press the TARE key Allow that HALF appears on the display Step 7 Carefully place an adequate size of the adjusting weight A on the weighing pan See the Adjusting Masses Chart 434 SH e 9710 27 2 Adjusting Masses Chart Adjusting Mass Size A Half Size B Full Size KERN 434 23 150g 300 g KERN 434 33 250g 500 g KERN 434 37 1500 g 3000 g Step 8 Press the TARE key Allow that FULL appears on the display Step 9 Carefully place an adequate size of the adjusting mass B on the weighing pan See the Adjusting Masses Chart Step 10 Press the TARE key Allow that PASS appears on the display The above procedure is successfully completed If CAL Err appears then check to make certain the procedure was followed correctly including proper size adjusting mass 434 SH e 9710 41 28 Span Adjusting The balance should be adjusted for span when it is first installed any time it is moved or bumped whenever the ambient temperature changes by more than 3 C and additionally every 30 days or so For this adjusting procedure please use a high quality non magnetic metric stainless steel Standard Mass that is OIML Class F2 or better 28 1 Adjusting Masses Chart Adjusting Masses
31. ltage 3 V appears on the Tester Step 8 Absolute voltage has to be 3 V even comparing No Load and Full Load F Contact Pin to GND Contact Point to TP 2 e Acceptable Voltage Range Full Load 3 V 41V 434 SH e 9710 37 25 A D Converter Check When checking the A D Converter you will be looking at the inner A C count from the Mechanical Unit Three weighing conditions will be tested and at the appropriate step you will be reading a number on the display and comparing it to Table A below Table A Model Adjusting Masses A D Count Value 138720 971040 KERN 434 23 1720128 2164032 1803360 2635680 138720 971040 KERN 434 33 1720128 2164032 2913120 3745440 138720 971040 KERN 434 37 1720128 2164032 2913120 3745440 Step 1 Set the balance to Check 3 Mode see Inner A D Counter Check Modes page 19 Step 2 Turn the power switch ON Step 3 Make certain the balance has no load on the pan Check to make certain that A D count value will be appeared within the correct range Step 4 Continuously place different adjusting masses A amp B in accordance with Table A And make certain that A D count values are displayed as same as the Table A shows If wrong A D count value appears then you must readjust to replace counter weight s on the force coil bobbin 38 434 SH e 9710 Step 5 Remove to readjust the counter weight if attached for having the correct value If not attached
32. n the bottom of the balance Step 2 Gently lift the Mechanical Unit box from the bottom case Step 3 Slowly place this Mechanical Unit box a flat surface and loosen 4 screws on top of this box Step 4 Open this box then the Mechanical Unit will be exposed 22 434 SH e 9710 14 3 Mechanical Unit Disassembly 434 SH e 9710 Step 1 Attach the appropriate KERN 434 Jig Set the beam Jig and the beam suspension Jig see the Jig Set page 21 Step 2 Loosen 4 screws on the upper plate bearing assembly and remove it Step 3 Loosen 4 screws on the lower plate bearing assembly and remove it Step 4 Loosen 4 screws for removing vertical plate springs Step 5 Loosen 2 screws on bottom of the balance weight and remove it Step 6 Loosen 4 screws for removing a coupling link Step 7 Loosen a screw on top of the beam positioning and remove it Step 8 Make certain that the beam assembly the suspension assembly and the mechanical unit base will be disassembled separately Step 9 Remove the magnet lid Step 10 Unsolder the short wire attached on the beam Step 11 Remove the Force Coil Bobbin from the beam We recommend that you should wear gloves when handling the Force Coil Bobbin 23 14 4 Assembly 24 Step 1 Note that the beam assembly is the force coil bobbin attached to the beam Step 2 Slightly loosen the screws where the force coil bobbin is attached to the beam Step 3 Be laid an
33. nd pole OMJ 12 4 434 SH e 9710 2 Introduction This Maintenance Manual covers three models from the KERN 434 series the KERN 434 23 KERN 434 33 and KERN 434 37 Please read this Maintenance Manual and the owner s Instruction Manual fully before beginning any maintenance work The KERN 434 series precision balances are the products of years of research development design and in field testing They incorporate the latest advances in mechanical and electronic engineering and offer the highest standard of reliability easy to use functions and rugged durability 3 Principles of operation The KERN 434 series precision balances work on the principle of Force Compensation Any change in the load on the weighing pan causes the Beam to pivot on fulcrum Plate Bearings see Block Diagram page 4 Attached to this Beam is a coil wound with fine wire called the Force Coil Bobbin which floats in a permanent magnet At the end of the Beam there is a small notch which allows light from a Light Emitting Diode LED to pass through to a Photo Sensor Light Measuring Diode At zero weight the light detected by the Photo Sensor is exactly equal to the light emitted by the LED When the end of the beam is forced up by the leverage exerted from a mass placed on the weighing pan the Photo Sensor detects a change in the position of the beam and the attached Force Coil Bobbin because the light reaching the Photo Sensor has become less than that
34. ni 2 allows the user to switch from grams to another unit by pushing the U key See Weighing Unit Initialisation page 9 to select or change the available weighing units Output Data Mode oUT The oUT function is used to change the output data mode when using the RS 232 C interface See RS 232 C Interface page 54 RS 232 C Mode rS The rS function allows you to switch between 8 bit non parity 8N1 and 7 bit even parity 7E1 when using the RS 232 C Interface See RS 232 C Interface page 58 63 Baud Rate Speed rSS The rSS function changes the baud rate speed when using the RS 232 C Interface See RS 232 C Interface page 8 for the steps required for this procedure Auto Start Mode AST ON If auto start mode is on the balance will be weighing position immediately without pressing the ON STBY key 8 434 SH e 9710 7 Description of Function Menu 0 00 0 g U Press the Fkey gt Press the TARE key al Press the U key S A P 1 2 2 3 2 A The display returns to the weighing mode if no operation is made for 3 sec See the appropriate section for further explanation of individual function 434 SH e 9710 9 8 Description of Functions Display Command Selectable Setting Factory Setting Remarks Very steady Range of Normal SAP Vibration 3 Unstable 2 Note 1 Adapter 1 Limited Range of Stability Unit Locking the key Selection Release the lock 2 Note 3 Output upon print 1
35. oduction Adjusting of KERN 434 series precision balances is required at initial installation any time the balance is moved or bumped whenever the ambient temperature changes by more than 3 C and additionally every 30 days or so Adjusting is necessary for two main reasons First with time and use mechanical deviations can occur Secondly the weight of a mass in one location or under a certain set of conditions will not always be the same at a different location or under a different set of conditions There are a number of adjusting procedures that will need to be done during the life of a KERN 434 series balance They are briefly explained below The actual adjusting procedures are contained throughout this manual see Table of Contents page 2 Linearity Adjusting The purpose of Linearity Adjusting is to create a straight line from Zero to the Full Capacity Scale Value to that the balance will display accurate weighing results at all values in between On the graph below the Y axis represents the true weight of a mass on the weighing pan and the X axis represents the weight displayed by the balance An accurate mass of any weight value will be plotted on a linear straight line path from zero to the maximum capacity However although a straight line will be generated by Linear Adjusting this line must be correctly placed by the balance during Span Adjusting see Linearity Adjusting page 41 Span Adjusting With Span Adjusting we
36. ogram data is unstable Attach a wind shield case display after all display is unsteady by draft vibration etc on the balance segment line when after pushing down plug into power the weighing pan to end Install the balance on an anti vibration table Dust cover attaching Set up the dust cover 2 Problem with check Power supply is Replace AC adapter point 2A 3A on MJ 3 fluctuated P C B AC adapter malfunction IC 2 IC 3 malfunction on D1 D2 malfunction on Replace the defective C3 C4 malfunction on 3 No signal at check IC 6 SCA malfunction Replace the defective 4 No triangle wave at Tr 7 Tr8 C 13 Replace the defective E or appears 1 Problem with voltage Same as D 2 Same as D 2 after all segment line at check point 2A 3A when AC adapter on MJ 3 P C B was plugged 2 Cable disconnection Disconnect Photo sensor Reconnect the cable T me rn Dem 8 CAL Err appears A D count value is Recheck the A D count Linearity program is Restore the correct 4 Visual check Object attaching weighing Clean around the Defective plate bearing or Replace the defective 5 Problem with voltage ZD IC 1 IC 2 Tr 1 Tr2 Replace the defective at check point 1B 2B malfunction or 3B on MJ 1 P C B 434 SH e 9710 65 6 A D count value at Defective plate bearings Replace the defective Check 3 Mode is or coupling link parts 0000000 or 3884160 Broken wire of force coil Defec
37. onics AD Adapter The proper voltage AC adapter for your local power supply is provided before shipment If you find that the AC adapter is providing too little voltage or that it generates irregular heat check the attached voltage label to make sure the proper voltage for your local power 30 2 EEPROM Check If the EEPROM Electronic Erasable Programmable Read Only Memory has been lost the balance will not show the normal weighing display when the power switch is turned on One of the following three messages will appear 48 434 SH e 9710 Step 1 Attempt to restore the linearity program into EEPROM by using the procedures given in the Linearity Adjusting section on page 41 Step 2 If the above procedure does not solve the problem then replace the EEPROM IC chip IC 8 30 3 Voltage Check There are a number of voltage checks that can be carried out on the P C Boards for pinpointing faulty electronics The main checking points 1A 2A 3A 4A 5A are on the power circuit MJ 3 Always check the voltage range first Other points are followed by listed numbers on the Electronic Fault Finding Chart page 47 and attached Circuit Diagrams hereafter 434 SH e 9710 49 31 Electronic Fault Finding Charts REMEDY Malfunction of AC adapter fucntion of JK connector Fuse is blow Malfunction of C3 C4 condensors Malfunction of IG IC REMEDY Malfunction of ICl IC2 IC3 Malfunction of C5 C6 CT condensors
38. rity and Span Adjustings Depending the user s needs a Temperature Compensation Adjusting may also be necessary see Initialisation of EEPROM page 39 18 434 SH e 9710 13 Inner A D Counter Check Mode Many of the maintenance procedures contained in this manual require adjustments to the Inner A D Counter Dip Switch hereby referred to as Dip Switch located on the Display P C B MJ 1A The Check Modes needed to perform the repair procedures contained in this manual are found below When a Dip Switch adjustment is required simply flip the switches so that they correspond to the appropriate Modes below 1 2 3 4 Check 0 Mode Off 1 2 3 4 Check 1 Mode Off A D Counter Range 0000000 3884160 434 SH e 9710 19 Check 2 Mode Temperature Compensation Data A D Counter Range 180000 220000 Check 3 Mode Linearity Data A D Counter Range 0000000 3884160 20 2 3 4 q Oo H Lde 1 2 Be 4 Dew 434 SH e 9710 14 Disassembly Assembly 14 1 Removing the Top Case Step 1 Unplug the AC adapter from the balance Step 2 Remove the weighing pan and the pan support Step 3 Loosen a forehead screw toward the display keyboard and screws on rear side of the balance Step 4 Gently lift off the top cover flipping it to the right Do not jerk the connecting cable Step 5 Disconnect all cables inside the balance 434 SH e 9710 21 14 2 Removing the Mechanical Unit Step 1 Loosen 3 screws o
39. rly attached Step 4 Remove the damaged part from the Mechanical Unit Step 5 Replace the Plate Bearing or Coupling Link Visually check to be sure the new part is perfectly straight and even Step 6 Remove Jig Set and return Mechanical Unit to the balance housing parallel 434 SH e 9710 35 Remark When reattaching plate bearing s then your tightening torgue has to be exactly the same compared to other tightening torgues KERN 434 23 434 33 1 Nm 10 kgfcm KERN 434 37 1 8 Nm 18 kgfcm 24 Beam Stopper Adjustment This procedure is required to adjust the up down movement range of the Beam in order to get a proper analogue count The Photo Sensor will catch the up down movement of the Beam and determine the proper supply of electronic current sent to the magnet Step 1 Step 2 Step 3 Step 4 Step 5 36 Remove the Balance Case see Assembly Disassembly page 21 24 Make certain that the beam stopper has to be set at exact height by using the beam stopper jig Reassemble the scale as shown in the illustration And make certain that all connecting cables have to be set completely Re plug AC adapter cord to the balance Contact a Digital Tester to Ground and Contact Point TP 2 on the MJ 1 P C B 434 SH e 9710 Step 6 Allow an adjustment hole right behind the pan suspension Step 7 Insert a screw driver in the hole and screw up or down the extension piece space until the acceptable vo
40. st malfunction disconnect CN 1 MJ 3 P C B malfunction connector 2 Problem with check IC 1 IC 2 IC 3 point 1A 2A 3A when malfunction C 5 C6 C7 correct voltage on malfunction or D3 D4 check point 4A 5A on D5 malfunction on MJ 3 MJ 3 P C B Before P C B checking must disconnect CN 1 connector 3 No display when Power cable malfunction check mode 1 Disconnect power cable Disconnect display cable 4 Problem with check Quarts malfunction point 1D on MJ 1 P C B 5 Problem with check IC 10 malfunction point 2D on MJ 1 P C B 6 No signal at check IC 5 malfunction point 3D 4D on MJ 1 P C B 7 No signal at check IC 6 malfunction point 5D on MJ 1 P C B B No display after 1 No display of correct C 6 malfunction on MJ 1 count display when data when check P C B plug AC adapter into mode 1 power when plug AC adapter into power Replace the defective parts Replace the defective parts Replace the new parts Re plug the power cable Re plug the display cable Replace the defective parts Replace the defective parts Replace the defective parts Replace the defective parts Replace the defective parts Replace the defective parts 2 Always error message IC 8 malfunction on MJ 1 Replace the defective display Error 3 P C B parts 64 434 SH e 9710 Problem Research Cause Possible Solution D Continuous flashing 1 Check whether zero Pr
41. tive Defective photo sensor sensor 7 Problem with TP 1 3 malfunction on MJ 1 Replace the defective TP 2 P C B parts IC 4 malfunction on MJ 1 Replace the defective P C B parts F Irregular span 1 Problem with A D Broken wire of Resolder the wire or adjusting count value at Check temperature sensor or reconnecting the 2 Mode disconnecting the connector connector 2 No signal at check Problem with IC 10 on point 11C MJ 1 P C B 8 Problem with signal at Problem with IC 11 IC check point 1C 2C 3C 4 Problem with voltage Problem with IC 12 Tr Replace the defective at check point 5C 6C 11 Tr 12 parts 7C 8C 5 Problem with voltage Problem with Tr 13 Tr at check point 4C 14 Tr 15 6 Recheck plate Problem with plate bearings or coupling bearings or coupling link link G When increasing 1 No electricity into forth Broken wire of the forth Replace the defective load on the weighing coil wire il parts pan display does not allow the Problem with Tr 3 Tr4 Replace the defective corresponding Tr 5 Tr 6 parts results in half way H No corresponding 1 Problem with AC Misuse of the wrong Heplace a new AC results when adapter voltage AC adapter adapter loading on the weighing pan 66 434 SH e 9710 Problem Research Cause Possible Solution I Very poor 1 Recheck weighing Air draft by air condition Attach Air Shield Case on reproducibility con
42. vements FORCE COIL JIG BEAM STOPPER JI P SUSPENSION JIG EO a M4x10 SCREW poe LEFT POSITIONING JI BEAM JIG ah T RIGHT POSITIONING JIG 434 SH e 9710 25 16 Additional Disassembly Assembly 16 1 Replacement of the Force Coil Bobbin TOP OF THE FORCE COIL BOBBIN 16 2 Cleaning Inside the Magnet 26 Step 1 Completely follow all procedure orders of the Disassembly Assembly section page 21 Step 2 Solder to release 4 lead wires toward the force coil bobbin on the MJ 6 P C B Allow this small P C B was attached on center of the beam Step 3 Remove the force coil bobbin from the beam by loosening the screws Allow counter weight s is also mounted on one or two of the same screw holes Step 4 Make certain that 4 lead wires were always isolated and attached in order on a new force coil bobbin Step 5 Slightly tighten the screws when reattaching the new force coil bobbin below the beam Step 6 make certain that 4 lead wires have to be resoldered exactly in order to the MJ 6 P C B Step 1 Make certain that any dust is attaching inside the magnet Step 2 Always blow out or clean inside the magnet by air or adhesive tape 434 SH e 9710 16 3 Positioning Edge of the Beam Inside the Photo Sensor Edge of the have has to be positioned 1 or 1 5 mm space inside the photo sensor 434 SH e 9710 27 17 Primary Checking Procedure When checking a damaged balance there
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