Service Manual RXB Version 1.0
Contents
1. 024 288 E7 Zero range at switching on E6 Normal condition Suggestion Internal value should be within 220 000 320 000 before linearity calibration and weight calibration Otherwise adjust resistance R30 and R31 until the internal value is within this range or change the load cell 16 RXB SH e 0710 7 Troubleshooting 7 1 Scale does not turn on Check the battery power which must be above 6V In case the voltage is below 5 V charge the scale If the voltage is less than 4 8V you have to change the battery Check the ON OFF switch if it is o k or any bad soldering 7 2 Cannot use full capacity Check the internal value according chapter 6 O Put the maximum weight on the weighing pan Press on the weighing plate to check if the internal value can be shifting It makes sure that the load cell is o k If there is no changing the load cell is damaged and you have to change it Check the overload screws If all are o k you have to check re enter the specification setting 7 3 Display OL and buzzer beep after turn on Check the wire of the load cell and the connection between load cell and main board O Check the load cell If necessary replace it 7 4 Missing unclear segment of the LCD display Check the pins of CPU if there are any short circuit broken or cold soldering or oxidized If this clean the pins by cleaning supplies and re solder the pins O Check the LCD displa2. KERN amp Sohn GmbH E E NI Ziegelei 1 Tel 0049 0 7433 9933 0 A WAAGEN GEWICHTE BALANCES WEIGHTS D 72336 Balingen Frommern Fax 0049 0 7433 9933 149 we E Mail info kern sohn com Internet www kern sohn com Service Manual Price Computing Scale Page 2 KERN RXB Version 1 0 01 2007 CONTENTS b EXplanallon Of dS play essin 3 22 SRE VDOC ARG HONGO Eee E 5 3 DEVICE MOJE ACBESS ee une 6 A FUNGUOM SCUINGS is 05er 7 4 1 NAVIGATION TASTE Te FID soe coda dia cca tp v rr La b mc ccu dert 7 4 2 Menu overview cccccceecceeeceeeceeeceeceeecauecaueceeecuecaueceesaeseuesaueseeesaeecuesnensages 8 4 2 1 FO Program Version number eese nennen 9 42 2 EL lineany Ccallbrall n sne a a aan 10 42 9 SE2 gt ope caion SCUNING S rn ee 12 424 Fo EXemMarcaliDr allo M ss 14 4 2 5 F6 Currency selecion n sn 15 5 BETOL MESSAdE Seen a A E ca dad ua Td 16 oO TOCNECKNENaAVAUG sni E Bev dert E 16 IEOUDIESNOOUNG reed 17 GA Cae does MOT UM ON zen 17 72 Gannot setulcapa isre EEE N ANATRA 17 7 3 Display OL and buzzer beep after turn on ssseessssesssssss 17 7 4 Missing unclear segment of the LCD display ssesusse 17 7 5 The span value internal value is unstable esses 18 7 6 Charging control lamp is always red or scale does not charge 18 8 OAL CI clc T m 19 2 RXB
3. Y Not documented Press TARE key U Not documented Press TARE key U Not documented Exit menu by pressing the 00 key balance returns to weighing mode 8 RXB SH e 0710 4 2 1 F0 Program Version number Weight Basic price Sales price Program Version No TARE Press key to continue the next function setting Press 00 key to return to the weighing mode RXB SH e 0710 4 2 2 F1 Linearity calibration amp The linearity calibration should be done with 3 points m Press the Ge key to abort the linearity calibration and return to the weighing mode m he example is for a 30kg capacity scale as following Weight Basic price Sales price Place the weighing pan on the scale press the G key LCD displays as following Weight Basic price Sales price XXXXXX Initial point Span value with weighing pan O Press the 00 key to memorize the initial value LCD displays as following Weight Basic price Sales price The first point Span value with weighing pan put 1 weight on the weighing pan After the scale is stable place the first weight on the weighing pan e g 10kg Press the key to memorize the first point of linearity calibration LCD displays as following 10 RXB SH e 0710 Weight Basic price Sales price XXXXXX The Second point Span value with weighing pan put the 2 weight on the weighing pan After the scale is stable place the second weight e g 10kg 10kg on th
4. DOOEX03 Rear panel ZKBE120000007 Keypad circuit LCAMO00501201 Load cell C3 PCFD02100300 Rear PCB PC0226000002 Main board PFOFDO000031 1 FD plastic pan PF1FD2300310 FD stainless steel pan ZPMN100000001 Adjustable feet PMAA23100000 Level approx 15mm t 8mm ZPMB100000018 Battery cover ZPMA100000104 Upper housing ZPMA100000106 Lower housing TM0110006014 Transformer 115 230V 10V WCC018302220 Power cable RXB SH e 0710 19
5. SH e 0710 1 Explanation of display Operator display balance Weight Basic price g KERN RXB Min 20 e 1g Loading status display Sales price Secondary display on customer page Weight Basic price Sales price RXB SH e 0710 Post mounted display for models with tripod Weight Basic price Sales price Display weight Here the weight of your goods is displayed The arrows next to the symbols show 0c Zeroing display Display basic price Here enter your basic price in kg or 100 g via keyboard The basic price can be switched to kg or 100 g The arrows next to the symbols show kg Basic price in kg 100 g Basic price in 100 g Display sale price Here the sales price is displayed in Euro The arrows next to the symbols show FIX otored basic price FIX mode on 4 RXB SH e 0710 2 Keyboard function Number keys enter basic price PLU Enter 00 key then 1 basic price in kg G S Press s key then 2 basic price in 100 g Press t Delete total basic price Delete last input of basic price Zero key range 0 2 max Taring key otore set basic price FIX Mode on off RXB SH e 0710 5 3 Service mode access Access to the service mode is controlled by jumper SWA1 on the main PCB The jumper has two positions LOCK which prevents access to the service mode and ADJ which allows access to
6. ameters in menus F2 or F6 The following default settings must be preset E RXB 30K10M RXB 30K10HM RXB 15K5M RXB 15K5HM 4 2 3 v i E RXB 6K2M RXB 6K2HM RXB 3K1M RXB 3K1HM 4 2 3 LE fo001 Attention Check these settings before carrying out verification RXB SH e 0710 13 4 2 4 F3 External calibration Attention In calibrated balances the adjustment function is switch locked To carry out calibrations you will have to throw the unlock switch SWA 1 See chpt 3 Observe stable environmental conditions A warming up time of ca 30 minutes is required for stabilization Ensure that there are no objects on the weighing plate e Activate the calibrating function F3 in the menu Weight WEit CAL e Press cy the following display will appear Weight internal value e Ensure that there are no objects on the weighing plate e Operate menu activation key See chpt 4 1 stop check is carried out then the weight value of the calibrating weight will appear on the weight display Weight 3 000 Kg XXXXXX maximum load weighing unit internal value e Carefully place adjusting weight in the centre of the weighing plate e Operate menu activation key See chpt 4 1 Weight CAL e While the balance is counting down to zero remove the adjusting weight e he balance returns automatically into weighing mode An error message will appear on the display should an adjustment e
7. e weighing pan Press the 00 key to memorize the second point of linearity calibration LCD displays as following Weight Basic price Sales price XXXXXX The Third point Span value with weighing pan put the 3 weight on the weighing pan After the scale is stable place the third weight e g 10kg 10kg 10kg on the weighing pan Press the key to memorize the third point of linearity calibration LCD displays as following Weight Basic price Sales price Take the weights off the weighing pan before the scale resets back to zero The linearity calibration procedure is completed RXB SH e 0710 11 4 2 3 F2 gt Specification settings Weight Basic price Sales price Press the Gg key to enter the keyboard testing mode LCD displays as following Weight Basic price Sales price XX Keyboard code for Europe O Press the activation key see chapter 4 1 and input the number into bits a g gt Ref to Appendix 1 see chapter 4 2 3 1 Shift to left Shift to right Basic price Sales price a b c d e f g h i i O fix Press the menu activation key LCD displays as following Basic price Sales price O Press the L menu activation key the scale resets back to zero automatically The specification procedure is completed 12 RXB SH e 0710 4 2 3 1 Appendix 1 Specification code table In the menu all parameters of the balance can be modified Do not change any par
8. rror occur or should the adjustment weight be incorrect Turn balance off then restart it and repeat the adjustment process 14 RXB SH e 0710 4 2 5 F6 Currency selection Weight Basic price Sales price Press the G key LCD displays as following Weight Basic price Sales price Previous value Ar S Press the key to select tL tit Euro Press the i menu activation key to confirm the setting procedure is completed To abort the setting press the key to exit the setting mode NOTICE Do not change any parameters in menus F2 or F6 The default setting F6 Euro must be preset RXB SH e 0710 15 5 Error messages ZERO after calibration is over 10 of TOTAL SPAN ZERO after calibration is under 1096 of TOTAL SPAN ZERO before calibration is higher than 320 000 ZERO before calibration is lower than 220 000 WEIGHT shown on the display is over the maximum capacity 9d 9 divisions B When the display appears E1 or E2 you have to re enter the specification calibration setting B When the display appears E6 or E7 maybe the load cell is out of order You have to check the load cell If it is necessary replace it 6 To check internal value Press key CEntr or appears on the display During this display press the c key immediately The display will show the internal value O To exit the internal value mode press the Key A D value 0 220 000 320 000
9. the calibration and configuration routines SWA 1 jumper is located adjacent to the RF screening cover of the main PCB u uni Place your balance upside down and remove seal cap For calibration and configuration routines the jumper SWA1 must be set to position ADJ sealing mark unlocking switch Position of unlocking switch Status To the right Unlock the balance for calibration process ADJ To the left Verification position calibration locked LOCK 6 RXB SH e 0710 4 Function settings 4 1 Navigation in the menu RXB SH e 0710 Menu activation key not visible Press this key and keep on pressing it when balance is turned off Whilst doing this turn on balance Keep pressing down the key until the balance counts down to zero and the first function FO appears Further functions FO F9 are selected by pressing the TARE key Exit menu by pressing the 00 Key balance returns to weighing mode 4 2 Menu overview Program Version No Press TARE key Baar y FO F1 F2 F3 F4 Linearity calibration can only be set while SWA1 is in the ADJ position Press TARE key F2 Specification settings F6 can be altered with SWA1 in LOCK or ADJ positions Press TARE key U F8 External Calibration Press TARE key y Not documented Press TARE key y F5 Not documented Press TARE key Select base currency Press TARE key
10. y the conductor rubbers and frames if there is a problem of fixing Check the LCD display and the rubber itself If necessary replace it RXB SH e 0710 17 7 5 The span value internal value is unstable Check the load cell itself If necessary replace it O Check the main board if there are any oxidation If necessary clean the PCB by cleaning supplies 7 6 Charging control lamp is always red or scale does not charge Measure the voltage of the battery If necessary replace it O Measure the output voltage of the transformer AC 10V If necessary replace it Measure the output voltage of the bridge regulator DC 10V If necessary replace it Measure the IC TIP31C at Q1 1 and 2 pin must be at 6 8V If necessary replace it Check zener diode D2 and resistor R17 If necessary replace it Measure the IC LM723 at U4 3 pin must be at 6 8 1 15V 4 pin must be at 3 2 3 4V 5 pin must be at 3 7 4 2V and 6 pin must be at 6 8 7 4V If it is abnormal replace the IC LM723 If all points above are o k check the IC 975 at Q7 If necessary replace it 18 RXB SH e 0710 8 Spare parts PART NO DESCRIPTION SW0000000020 Switch on off 2pin 1170002030 Power socket ZACCO00000009 FD aluminum support ZACA000000010 FD aluminum bracket BT0006004500 Rechargeable battery 6V 4 5Ah acid FP11 FDOOEX04 Front panel FP21F
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