FCB Version 1.1
Contents
1. display check battery adaptor connection between keyboard main board battery adaptor main board If missing segments check fixing of LCD frame zebra connector under LCD Display Zero If display LO check battery gt 7 5v adaptor gt 9v If display check internal count Proper readout If unstable reading check weighing plate overload stopper load cell and wires environmental conditions and stable table Correct reading If not accurate perform internal calibration If cannot reach full capacity check weighing plate overload stopper load cell and internal zero point If always zero check internal zero point Internal calibration if necessary Proper Data to External Device If external device not response check correct RS232 cable and connection application software running correctly wires connecting D sub connector and main PCB 4 Normal operation FCB SH e 0911 7 5 To Replace PCB Disassemble top housing of scale 2 Disconnect PL1 PL2 PL3 and JP2 from the PCB Disassemble the ground wire screw Replace anew PCB Connect PL1 PL2 PL3 and JP2 again Assemble the ground wire with screw 3 Assemble the top housing 4 Perform internal calibration as described in section 2 5 Check accuracy of scale at different weig2. shows the weight that is placed on the weighing pan while the display has stabilized Remove the calibration weight and press the TARE key to reset the zero point In case CAL E is displayed instead of CAL F this indicates a calibration procedure error Turn the scale off and then on and repeat the procedure 2 3 Internal Calibration Procedure Remove the top housing of the scale Connect J3 on the main board by soldering the pads together J4 for FCB 8K0 1 FCB 16K0 2 and FCB 30K0 5 Place scale on a hard level surface With weighing pan installed turn balance on Display shall show the internal counts The internal counts shall fall in the range from 60 000 to 85 000 70 000 to 300 000 for FCB 8K0 1 FCB 16K0 2 and FCB 30K0 5 In case out of this range connect J10 left side or right side J6 for FCB 8K0 1 FCB 16K0 2 and FCB 30K0 5 to increase or reduce the reading Connecting or disconnecting pads on J7 J8 or J9 J2 J3 J4 or J5 for FCB 8K0 1 FCB 16K0 2 and FCB 30K0 5 can fine tune the reading Press Set M key once Display will show CAL 0 and then the required calibration weight Place the corresponding calibration weight on the center of the weighing plate Press Set M again while the weight placed on the weighing pan is stable Display will now show CAL 1 and then the next calibration weight Place the corresponding calibration weight on the weighing plate Repeat this step until display shows CAL F
3. B 24K1 FCB 24K2 FCB 24K10 FCB 3K0 1 FCB 6K0 5 FCB 30K1 006 OIII ET KEN LEE E sO HZ 0 5 MT 8 8 18 m ste E Oo R30 0123456789 000 R45 08 Elm 5052 094101 REV O DI u 8 3 Dz g De ES emd RB R7 R6 ac EEIEEEEE ps Eller C4 9 lt PL4 14 5 58 88888 FCB SH e 0911 FCB SH e 0911 15 FCB 8K0 1 FCB 16K0 2 FCB 30K0 5 SNOISIA3Y 1 IN3NOdNOD 82 5 4 000 1220 2505 16 FCB SH e 0911 Delea NEm 3 3 m 4189530 SNOISIA3Y 1NOAYT LN3NOdNOD 829 S Q 000 1112 0 2505 FCB SH e 0911 17
4. CB 6K0 5 FCB 30K1 IM Pioa LLELE LIED 3 z PREDESES EUR n 8 119977 zh ah al Bgd 10 FCB SH e 0911 11 1 18 ONW MO O FR n 1 1 8 4 0 ch FCB 8K0 1 FCB 16K0 2 FCB 30K0 5 E3 EL OE 39260 _ 3 sa 8888 TTL eet ee TR a i 12 FCB SH e 0911 un WEE 837 RIS R51K 1x RIG 100K 1 AW C12 0 1uF H ono R51 en 100 1 O 1uF M CAP 0 00357 on R20 s R49 200K 1 0 01nF 1 R21 100K 1x 200k GND EN RB a gt 4 7K 1 GND Pui CN mofi D R22 ae mnn 1 R34 20 025 21 26 3 3V 380K Tore ONO Tour Fr SND 5 GND A Q HFSS TE R35 L R23 C17 10 gan 100K 1 GND x me AM rl 23 Taru 024 ent No car 229 a u O tuF AGNO 0 1uF AGND 22 22 AGND S of AGND AGND munasun 2 O AGND 1 s Jew war 1 ae I cr apapa m monos rar m n O 8 Components Layout FCB 6K1 FCB 12K1 FCB 15K5 FC
5. Converter In order for the analog signal can be input to the microprocessor this part converts the analog signal to its digital equivalent The operation of the analog to digital converter is using a SIGMA DELTA technique and under the control of microprocessor Microprocessor The microprocessor control all the functions of the scale such as auto zero A D conversion timings weight calculation unit convertion and display parts counting percentage weight RS232 interface overload indication low battery indication tare memory function etc Display This is the part where the weight is shown out on the LCD display in digital form The whole display is driven by the microprocessor Power Regulator and Low Battery Detector This part contains the ON OFF power control In order for the external power can be used by other parts of the scale a regulator is used to regulate the supply A low battery detector is employed to make sure that the power supply is strong enough for normal operation of the scale If rechargeable battery is installed it can be charged up by the charging circuit Keyboard The keyboard provides on user interface On Off Mode Cal Set M Print and Tare keys are employed to operate the scale RS232 Interface The RS232 serial interface provides the communication to the external computer or printer FCB SH e 0911 4 Trouble Shooting Power on Full Segments If no
6. N KERN Sohn GmbH WAAGEN GEWICHTE BALANCES WEIGHTS Ziegelei 1 Tel 49 0 7433 9933 0 D 72336 Balingen Fax 49 0 7433 9933 149 E Mail info kern sohn com Internet www kern sohn com Service manual Compact balances FCB FCB SH e 0911 1 2 3 N OOO A KERN FCB Version 1 1 4 2009 Service manual Compact balances Table of Contents Basic Information Introduction 2 1 2 2 2 3 2 4 Features Digital Auto Calibration Procedure Internal Calibration Procedure Display Segment Test Functional Block Diagram Description 3 1 Functional Block Diagram 3 2 Function Description Trouble Shooting To Replace PCB To Replace Load Cell Assembly Schematics Components Layout FCB SH e 0911 AN O Q Q Q WwW Ww 1 Basic Information Grundlegende Hinweise The device must be repaired only by trained specialist staff or personnel with professional formation such as a repair specialist accredited by law concerning verification The service manual is obligatory for repair work After repair original conditions of the device have to be restored Only original spare parts should be used Das Ger t darf nur von geschultem oder beruflich ausgebildetem Fachpersonal 7 eichrechtlich anerkannter Instandsetzer repariert werden Die Serviceanleitung ist bindend f r Reparaturen Das Ger t muss nach erfolgter Reparatur wieder in den Originalzustand zur ckversetzt
7. Remove all weights from weighing pan Display shall return to zero 7 Reset the zero point and check the accuracy at different weight 8 Disconnect J3 J4 for FCB 8K0 1 FCB 16K0 2 and FCB 30K0 5 9 Install the top housing of scale In case CAL is display instead of CAL F this indicates a calibration procedure error or wrong weight applied for calibration Turn the scale off and then on and repeat the procedure 4 FCB SH e 0911 2 4 Display Segment Test Whenever the scale is power on all segments of the LCD will be turn on for 4 seconds Check for any missing segment 3 Functional Block Diagram Description 3 1 Functional Block Diagram External Computer Printer Keyboard LCD RS232 Serial Interface Power control N Regulator amp Microprocessor Adaptor Low battery detector signal Load cell A D Converter Sensor analog signal FCB SH e 0911 5 3 2 Function Description 1 Load cell This is the heart of the whole system The load cell itself is arranged as a bridge The resistance change of the bridge elements is proportional to the load applied on the load cell Therefore the output of the load cell is an analog signal which is proportional to the load applied on the scale Amplifier The analog signal from the load cell is very small of the order of micro volt Hence linear and stable amplifier is applied to amplify the analog signal to an appropriate level D
8. ht FCB6K1 FCB12K1 FCB15K5 FCB24K1 FCB24K2 weight tol weight tol weight tol weight tol weight tol g g 9 g 9 9 9 9 9 9 1000 3 2000 3 1000 15 5000 3 5000 6 2000 3 4000 3 5000 15 10000 3 10000 6 4000 3 8000 3 10000 15 15000 3 15000 6 6000 3 12000 3 15000 15 20000 3 20000 6 24000 3 24000 6 FCB24K10 FCB3K0 1 FCB6K0 5N FCB30K1 FCB8K0 1 weight tol weight tol weight tol weight tol weight tol 9 9 9 9 9 9 9 9 9 9 5000 30 1000 0 2 1000 1 5000 2 1000 0 2 10000 30 2000 0 3 2000 1 5 10000 3 3000 0 3 15000 30 3000 0 3 4000 1 5 15000 3 5000 0 3 20000 30 5000 1 5 20000 3 7000 0 3 24000 30 6000 1 5 30000 4 8000 0 3 FCB16K0 2 FCB30K0 5 weight tol weight tol 9 9 9 9 1000 0 4 5000 1 5000 0 6 10000 1 5 10000 0 6 15000 1 5 15000 0 6 20000 1 5 16000 0 6 30000 2 6 Check other functions such as Tare Memory Print Mode and Auto Off FCB SH e 0911 6 oS To Replace Load Cell Assembly Disassemble top housing of scale Disconnect PL2 SENSOR for FCB 8K0 1 FCB 16K0 2 and FCB 30K0 5 from main PCB Remove the four screws fixing the bottom plate of the load cell assembly Replace the load cell with a new one Connect PL2 SENSOR for FCB 8K0 1 FCB 16K0 2 and FCB 5 and fix the four screws Put 110 full capacity loading onto weight stand of scale Adjust the overload screws on the
9. weight stand until they just not touch the bottom plate Assemble the top housing Perform internal calibration as described in section 2 Check accuracy of scale at different weight FCB6K1 FCB12K1 FCB15K5 FCB24K1 FCB24K2 weight tol weight tol weight tol weight tol weight tol g g g g 9 9 9 9 9 9 1000 3 2000 3 1000 15 5000 3 5000 6 2000 3 4000 3 5000 15 10000 3 10000 6 4000 3 8000 3 10000 15 15000 3 15000 6 6000 3 12000 3 15000 15 20000 3 20000 6 24000 3 24000 6 FCB24K10 FCB3K0 1 FCB6K0 5N FCB30K1 1 weight tol weight tol weight tol weight tol weight tol 9 9 9 9 9 9 9 9 9 9 5000 30 1000 0 2 1000 1 5000 2 1000 0 2 10000 30 2000 0 3 2000 1 5 10000 3 3000 0 3 15000 30 3000 0 3 4000 1 5 15000 3 5000 0 3 20000 30 5000 1 5 20000 3 7000 0 3 24000 30 6000 1 5 30000 4 8000 0 3 FCB16K0 2 5 weight tol weight tol 9 9 9 9 1000 0 4 5000 1 5000 0 6 10000 1 5 10000 0 6 15000 1 5 15000 0 6 20000 1 5 16000 0 6 30000 2 7 Check other functions such as Tare Memory Print Mode and Auto Off FCB SH e 0911 9 7 Schematics FCB 6K1 FCB 12K1 FCB 15K5 FCB 24K1 FCB 24K2 FCB 24K10 FCB 3K0 1 F
10. werden Es d rfen nur Originalersatzteile verwendet werden 2 Introduction 2 1 Features Full Tare Memory function with indicator Stable indicator Negative value indication Two types of Digital Auto Calibration Solder pads to prevent end user internal calibration RS232 interface printing function Custom scale by going through SET manual Multiple serial interface modes Different communication baud rates selectable Auto off enable disable Zero tracking enable disable Multiple calibration weight selectable Backlight selectable Pre Tare function Animal weighing mode Low battery indicator Auto off function battery mode only AC adaptable Display segment test function Overload protection Optional rechargeable battery FCB SH e 0911 2 2 Digital Auto Calibration Procedure 6 Turn balance on and allow the unit to acclimatize and stabilize for 30 minutes Select the calibration weight through the manual with Print Mode Cal and Set M keys Press and hold the Mode Cal key until the display shows a flashing weight reading The flashing weight reading indicates the correct weight that must be placed on the weighing pan Gently place the correct calibration weight on the center on the weighing pan With the display still flashing press the Set M key The display will now show Cal F and then return to normal operating mode The calibration is complete when the display correctly
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