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20 

 

MWB-SH-e-1810.docx 

13.6  Check PCB Voltages 

 

If the problem is in the PCB, use a multimeter to check the following voltages 
 

13.7  PCB Input Voltage 

 

Check the PCB input power connecter voltage 

   Voltage must be minimum 9VDC in to the pin AD+ 

 

13.8  Check Battery Voltage 

 

Check the Battery Voltage 

   The battery voltage below the 1.5VDC, replace the battery and install new 

1.5V battery. 

 

 

 

Summary of Contents for MWB series

Page 1: ...sohn com Tel 49 0 7433 9933 0 Fax 49 0 7433 9933 149 Internet www kern sohn com Service Manual Wheelchair scale KERN MWB Version 1 0 03 2018 GB MWB SH e 1810 Importør Impex Produkter AS Gamle Drammensvei 107 1363 Høvik www impex no info impex no Tel 22 32 77 20 ...

Page 2: ...ration Manual 10 6 Transport and storage 10 6 1 Testing upon acceptance 10 6 2 Packaging return transport 10 7 Unpacking Setup and Commissioning 11 7 1 Place of installation place of operation 11 7 2 Unpacking 11 7 3 Scope of delivery 11 7 4 Levelling 11 8 Menu 12 8 1 Navigation in the menu 12 8 2 Menu overview 12 9 Error Messages 14 10 Servicing maintenance disposal 15 10 1 Cleaning 15 10 2 Clean...

Page 3: ...e 1810 docx 3 13 5 Load Cell Connections 19 13 6 Check PCB Voltages 20 13 7 PCB Input Voltage 20 13 8 Check Battery Voltage 20 13 9 Replace Main Board 21 13 10 Replace Battery 21 14 Drawing 22 15 Schematic 23 ...

Page 4: ...efore it can be used again in a statutorily regulated field Detailed instructions about conformity evaluated scales Repair must be carried only at 100 compliance with the type approval A violation of this specification will result in a loss of the type approval After successful repair the balance will have to be reverified before it can be used again in a statutorily regulated field 2 Introdution ...

Page 5: ...MWB SH e 1810 docx 5 3 Appliance overview 1 Cover of weighing cell feet 2 Weighing surface 3 Bubble level 4 Hand grip 5 Connection cable 6 Display Unit Bubble level and handle 2x Conveyor roller 2x ...

Page 6: ...6 MWB SH e 1810 docx 3 1 Details Display unit rear side 1 Battery compartment 2 Connecting cable display unit platform ...

Page 7: ...d the balance not display exactly zero despite empty scale pan press the button Your balance will be set to zero after a short standby time STABLE Stability display Scales are in a steady state BMI Body Mass Index Is actively displayed during active BMI function HOLD HOLD function Is displayed with active hold function Battery symbol Lights when the voltage drops below the prescribed minimum Light...

Page 8: ...on BMI key Calculation of the Body Mass Index In menu Confirm selection For numeric entry Confirm numerical value Function key In menu Call up menu Select menu items For numeric entry Increase numerical value Zero setting key Weighing scale will be reset to 0 0 For numeric entry Change decimal place TARE key Tare balance ...

Page 9: ...y not be modified This may lead to incorrect weighing results safety related faults and destruction of the balance The balance may only be used according to the described conditions Other areas of use must be released by KERN in writing The balance cannot be used to determine a body weight in practice of medicine 4 3 Warranty Warranty claims shall be voided in case Our conditions in the operation ...

Page 10: ...ing upon acceptance When receiving the appliance please check packaging immediately and the appliance itself when unpacking for possible visible damage 6 2 Packaging return transport Keep all parts of the original packaging for a possibly required return Only use original packaging for returning Prior to dispatch disconnect all cables and remove loose mobile parts Reattach possibly supplied transp...

Page 11: ...humidity on the appliance may occur if a cold appliance is taken to a considerably warmer environment In this case acclimatize the disconnected appliance for ca 2 hours at room temperature Avoid static charge of the balance and of the person to be weighed Avoid contact with water Major display deviations incorrect weighing results may be experienced should electromagnetic fields e g due to mobile ...

Page 12: ...ted function by The current setting will be displayed Select desired setting by and confirm with the balance returns to the menu Exit menu Return to weighing mode Press the balance will return to weighing mode 8 2 Menu overview Function Settings Description Adjustment Adjustment d 0 d 0 0 d 0 00 d 0 000 d 0 0000 Capacity Automatic cutout Auto Off oFF 3 Automatic shutdown after 3 min oFF 5 Automati...

Page 13: ...MWB SH e 1810 docx 13 Gravity Gravity not documented ...

Page 14: ...D converter range Damaged weighing cell Damaged electronics Unable to initialize zero point Measuring cell defective overloaded Object on weighing pan contact Transport safety device has not been removed Main board defective OL or Overload Unload switch off and adjust the balance or 0 Underload Unload switch off and adjust the balance Should other error messages occur switch balance off and then o...

Page 15: ...t the scales before opening 10 4 Disposal Disposal of packaging and appliance must be carried out by operator according to valid national or regional law of the location where the appliance is used 11 Instant help In case of a fault in the program sequence the balance should be shortly switched off The weighing process must then be restarted from the beginning Failure Possible causes The displayed...

Page 16: ... is no longer correct Great fluctuations in temperature The balance is on an uneven surface Electromagnetic fields static charging choose different location switch off interfering device if possible Should other error messages occur switch balance off and then on again If the error message remains inform manufacturer ...

Page 17: ...pare the required adjustment weight The adjustment weight to be applied depends on the capacity of a weighing scale see chap 1 Carry out adjustment as closely as possible to admissible maximum load of weighing scale Info about test weights can be found on the Internet at http www kern sohn com Observe stable environmental conditions For warm up time required for stabilization Procedure Switch on b...

Page 18: ...o get into the device Use a clean and soft cloth for rub off 13 3 Determine the Problem Determine whether the problem is in the PCB or the Load Cell Remove power from the system and disconnect the load cell connection from the PCB Connect the PCB to a load cell simulator Reapply power and test the PCB If problem goes away its source is probably in the Load cell Check the wiring connecter load cell...

Page 19: ...White Shield Measuring Points Resistance Red Exc to White Exc 420 20Ω Green Sig to Black Sig 350Ω 5Ω Load cell connection for the 4 load cell s RED EXE WHITE SIG GREEN SIG BLACK EXE YELLOW SHIELD Connection for the indicator RED EXE Empty SEN GREEN SIG BLACK SHIELD BLUE SIG Empty SEN YELLOW EXE ...

Page 20: ...eter to check the following voltages 13 7 PCB Input Voltage Check the PCB input power connecter voltage Voltage must be minimum 9VDC in to the pin AD 13 8 Check Battery Voltage Check the Battery Voltage The battery voltage below the 1 5VDC replace the battery and install new 1 5V battery ...

Page 21: ...4 screw for main board pull out all connector on the main board then you can bring out main board carefully Install the new main board plug all connector at last After check anything try to turn on the power if anything is OK close the top cover replace main board completely 13 10 Replace Battery Open battery compartment cover Remove the dry battery Insert new batteries Lock the battery cover agai...

Page 22: ...22 MWB SH e 1810 docx 14 Drawing ...

Page 23: ...MWB SH e 1810 docx 23 15 Schematic ...

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