KERN RXB 30K10M User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen-Frommern
E-Mail: [email protected]
Tel: 0049-[0]7433- 9933-0
Fax: 0049-[0]7433-9933-149
Internet: www.kern-sohn.com
GB
Service Manual
Price Computing Scale
Page 2
KERN RXB
Version 1.0 01/2007

CONTENTS
1Explanation of display.......................................................................................... 3
2Keyboard function ............................................................................................... 5
3Service mode access .......................................................................................... 6
4Function settings ................................................................................................. 7
4.1 Navigation in the menu................................................................................. 7
4.2 Menu overview............................................................................................. 8
4.2.1 F0 ⇒Program Version number ............................................................ 9
4.2.2 F1 ⇒Linearity calibration.................................................................... 10
4.2.3 F2 ⇒Specification settings................................................................. 12
4.2.4 F3 ⇒External calibration.................................................................... 14
4.2.5 F6 ⇒Currency selection..................................................................... 15
5Error messages................................................................................................. 16
6To check internal value...................................................................................... 16
7Troubleshooting................................................................................................. 17
7.1 Scale does not turn on ............................................................................... 17
7.2 Cannot use full capacity............................................................................. 17
7.3 Display “OL” and buzzer “beep” after turn on............................................. 17
7.4 Missing/unclear segment of the LCD display ............................................. 17
7.5 The span value / internal value is unstable ................................................ 18
7.6 Charging control lamp is always red or scale does not charge .................. 18
8Spare parts........................................................................................................ 19
2 RXB-SH-e-0710

1 Explanation of display
Operator display balance:
Weight Basic price
0.000 0.00
0.00
Loading status display Sales price
Secondary display on customer page:
Weight Basic price Sales price
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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:
NET Net weight
Æ0ÅZeroing 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 Stored basic price//FIX mode "on"
4 RXB-SH-e-0710

2 Keyboard function
Choice Function
-
9
•Number keys, enter basic price /PLU
•Enter "00"
•Press -key, then 1 = basic price in €/kg
•Press -key, then 2 = basic price in €/100 g
•Delete total basic price
•Delete last input of basic price
•Zero key, range (± 0.2 % max)
•Taring key
FIX
•Store 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 the calibration and configuration routines.
♦SWA 1 jumper is located adjacent to the RF screening cover of the main PCB.
♦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
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 F0 appears.
Further functions F0 – F9 are selected by
pressing the TARE key.
Exit menu by pressing the key,
balance returns to weighing mode.
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4.2 Menu overview
F0 Program Version No.
Press TARE key
⇓
F1 Linearity calibration
Press TARE key
⇓
F2 Specification settings
Press TARE key
⇓
F3 External Calibration
Press TARE key
⇓
F4 Not documented
Press TARE key
⇓
F5 Not documented
Press TARE key
⇓
F6 Select base currency
Press TARE key
⇓
F7 Not documented
Press TARE key
⇓
F8 Not documented
Press TARE key
⇓
F9 Not documented
Remark:
♦F0, F1, F2, F3
can only be set while SWA1 is in the
ADJ position.
♦F6 can be altered with SWA1 in
LOCK or ADJ positions.
Exit menu by pressing the 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.
♦Press key to continue the next function setting.
♦Press key to return to the weighing mode.
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4.2.2 F1 ⇒Linearity calibration
The linearity calibration should be done with 3 points.
Press the
9
key to abort the linearity calibration and return to the weighing
mode.
The example is for a 30kg capacity scale as following:
Weight Basic price Sales price
.
nPlace the weighing pan on the scale, press the key. LCD displays as
following:
Weight Basic price Sales price
.
xxxxxx
Initial point Span value (with weighing pan)
oPress the key to memorize the initial value. LCD displays as following:
Weight Basic price Sales price
.
xxxxxx
The first point Span value (with weighing pan)
(put 1st weight on the weighing pan)
After the scale is stable, place the first weight on the weighing pan (e.g.10kg).
pPress the key to memorize the first point of linearity calibration. LCD displays
as following:
10 RXB-SH-e-0710

qWeight Basic price Sales price
.
xxxxxx
The Second point Span value (with weighing pan)
(put the 2nd weight on the weighing pan)
After the scale is stable, place the second weight (e.g.10kg+10kg) on the weighing
pan.
rPress the key to memorize the second point of linearity calibration. LCD
displays as following:
sWeight Basic price Sales price
.
xxxxxx
The Third point Span value (with weighing pan)
(put the 3rd weight on the weighing pan)
After the scale is stable, place the third weight (e.g.10kg+10kg+10kg) on the
weighing pan.
tPress the key to memorize the third point of linearity calibration. LCD displays
as following:
Weight Basic price Sales price
.
uTake 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 ⇒Specification settings
Weight Basic price Sales price
. .
nPress the key to enter the keyboard testing mode, LCD displays as following:
Weight Basic price Sales price
XX
Keyboard code (for Europe)
oPress the menu activation key (see chapter 4.1) and input the number into bits
(a~g). ⇒Ref. to Appendix 1 (see chapter 4.2.3.1)
» Shift to left
» Shift to right
Weight Basic price Sales price
ÑÒ
(a) (b)(c)(d)(e) (f) (g) (h) (i) (j) 0(fix)
pPress the menu activation key, LCD displays as following:
Weight Basic price Sales price
ÑÒ
qPress the menu activation key, the scale resets back to zero automatically.
The specification procedure is completed.
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4.2.3.1 Appendix 1: Specification code table
In the menu all parameters of the balance can be modified.
Do not change any parameters in menus F2 or F6.
The following default settings must be preset.
RXB 30K10M/RXB 30K10HM RXB 15K5M/RXB 15K5HM see
chpt.
4.2.3
point
06221 10000 00000 05221 10000 00000 2
F2 03000 00000 00001 15000 00000 00001 3
F6 Euro Euro
RXB 6K2M/RXB 6K2HM RXB 3K1M/RXB 3K1HM see
chpt.
4.2.3
point
04221 10000 00000 02221 10000 00000 2
F2 06000 00000 00001 03000 00000 00001 3
F6 Euro Euro
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 SWA1
(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.
•Activate the calibrating function F3 in the menu
Weight Basic price Sales price
F3 WEit CAL.
•Press -key, the following display will appear:
Weight Basic price Sales price
0,000 kg XXXXXX
(internal value)
•Ensure that there are no objects on the weighing plate.
•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 Basic price Sales price
3.000
(maximum load) Kg (weighing unit) XXXXXX (internal value)
•Carefully place adjusting weight in the centre of the weighing plate
•Operate menu activation key (See chpt. 4.1)
Weight Basic price Sales price
CAL. done
•While the balance is counting down to zero, remove the adjusting weight.
•The balance returns automatically into weighing mode. An error message will
appear on the display should an adjustment error 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 key, LCD displays as following:
Weight Basic price Sales price
Previous value
Press the key to select (Euro).
Press the 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.
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5 Error messages
⇒ZERO (after calibration) is over +10% of TOTAL SPAN
⇒ZERO (after calibration) is under -10% 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)
When the display appears E1 or E2, you have to re-enter the specification
calibration setting.
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
nPress key
o[CEntr] or [-----]appears on the display. During this display press the key
immediately.
pThe display will show the internal value.
qTo exit the internal value mode, press the key.
A/D value 0 220,000 320,000 …… 524,288
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
nCheck the battery power which must be above 6V. In case the voltage is below
5.7V, charge the scale. If the voltage is less than 4.8V, you have to change the
battery.
oCheck the ON/OFF switch - if it is o.k. or any bad soldering.
7.2 Cannot use full capacity
nCheck the internal value according chapter 6
oPut 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.
pCheck 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
nCheck the wire of the load cell and the connection between load cell and main
board.
oCheck the load cell. If necessary, replace it.
7.4 Missing/unclear segment of the LCD display
nCheck 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.
oCheck the LCD display, the conductor rubbers and frames if there is a problem of
fixing.
pCheck 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
nCheck the load cell itself. If necessary, replace it.
oCheck 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
nMeasure the voltage of the battery. If necessary, replace it.
oMeasure the output voltage of the transformer (AC 10V). If necessary, replace it.
pMeasure the output voltage of the bridge regulator (DC 10V). If necessary, replace
it.
qMeasure the IC TIP31C at Q1 – 1st and 2nd pin must be at 6-8V. If necessary,
replace it.
rCheck zener diode D2 and resistor R17. If necessary, replace it.
sMeasure the IC LM723 at U4 – 3rd pin must be at 6.8 - 1.15V, 4th pin must be at
3.2 - 3.4V, 5th pin must be at 3.7 - 4.2V and 6th pin must be at 6.8 - 7.4V. If it is
abnormal, replace the IC LM723.
tIf 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
ZACC000000009 FD aluminum support
ZACA000000010 FD aluminum bracket
BT0006004500 Rechargeable battery 6V/4.5Ah (acid)
FP11 FD00EX04 Front panel
FP21FD00EX03 Rear panel
ZKBE120000007 Keypad + circuit
LCAM00501201 Load cell (C3)
PCFD02100300 Rear PCB
PC0226000002 Main board
PF0FD0000311 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
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