Service Manual for EC counting scale
Contents
1. the scale will start to count down Press and hold the Calibration Switch during the count down Release the button when the count down stops for one or two seconds Only Weighing Calibration Type2 COUNT ec XXXXXX rPcs zZ XXXXXX 0 O g PC ro 3 Change and choose the weight units accuracy and capacity by using the ENTER and the MOVE key 0 lt i NET The steps are as below Choose weight units A After the scale finish self checking press the ENTER key to enter into selecting weight units setting and the display shows w O pos ZN 4 WEIGHT g UNIT WEIGHT 0 4 XXXXXX COUNT O m ig B Press the MOVE key to change the value 1 kg 0 g i NET C Press the ENTER key to confirm and enter into next step Choose accuracy value Note If only the unit should be changed then keeping press the ENTER key until the display shows as below and press CLEAR key to exit calibration model COUNT gt gt em XXXXXX ees zZ WEIGHT g UNIT WEIGHT XXXXXX 0 O g PC gt 0 lt NET i Choose accuracy value a The display shows COUNT l aoa le ZN 4 WEIGHT g UNIT WEIGHT 0 lt 4 ot XXXXXX d g PC ner o O b Press the MOVE key to change the value There are three system preset 1 2 5 can be chosen c Press the ENTER key to confirm and enter into next step Choose capacity Ch2. the voltage of the transmit any transmit method or Y of the 7 pins of the input pin of the IC data baud rate is matching RS232 socket is U1ADM202EA U1 is 5V with the printer or PC around 10V N Correct the setting The socket is Re solder the IC U1 Check the 6 cores cable is damaged replace it The trouble can be living solved Replace the IC U1 The voltage balance The Crystal between the pins of Oscillator is the Crystal Oscillator damaged CR1 is around Replace it 0 20v Replace the CPU 89C2051 and the trouble can be solved Replace the complete RS 232 board 4 Weighing is inaccurate or instable Weighing is inaccurate or The AC power supply is The AC power supply instable normally should be stable The voltage of the battery Recharge the battery or is less than 5 40v change the battery There is something touches the upper support or there is something on the pan Take it away then Move it away the trouble can be solved Recalibrate the scale The trouble can be solved Replace the load cell and re calibrate The trouble The load cell was damaged can be solved The trouble was in main board Replace it and re calibrate the scale 5 The keys don t work The keys don t work Short the key by using a forceps the trouble can be solved Replace the 12 cores cable and the trouble can be solved Replace the CPU 89C52 to check if the troub
3. unit weight window shows 03 and the weight window shows the weight value 3 3 Max of full capacity which should be put on for the third time Put on the weight refer to the display Several seconds later the scale returns to counting mode Then the calibration procedure is finished Switch off and take off all the weight then switch on the scale can be used Simple calibration without weight Gravity Value calibration 1 Turn on the scale and key in 000419 during counting down self check to zero to enter into Simple Calibration mode The displays will indicate as below eventually Take 6kg scale for instance COUNT w aD CAL res ENE WEIGHT g UNIT WEIGHT 0 4 h 0 0000 si 6 0000 grc NET Oo Required weight 6 kg for calibration 2 Keying in an error coefficient R R A B A the correct value B the error value then press the ENTER key then the scale will be calibrated and return to normal counting mode Press CLEAR key to escape from calibration mode at any time The error coefficient is shown in UNIT WEIGHT window and the decimal dot is fixed after the first digit and it is hidden So it is no need to key in the decimal dot For example a If the error coefficient is 0 89737 then the display will be as COUNT r gt BC CAL res VaN 4 WEIGHT g UNIT WEIGHT E af 0 000 j 89737 arc NET mi b If the error coefficient is 1 23456 then the display w
4. Service Manual for EC counting scale I Phenomena of trouble 1 2 3 4 Trouble of part The trouble phenomena are as following a Buzzer buzzer doesn t make sound or sometimes make sound and sometimes doesn t make sound b LCD The display is faultily c Backlight The backlight doesn t lighten or sometimes it lighten and sometimes doesn t lighten d Key The key don t work Trouble of load cell The trouble phenomena are as following a The display data is drifting b The display data doesn t change or the internal resolution value is not in the natural range c The internal resolution data drift badly d The initial resolution is drifting Trouble of power supply The phenomenon is as following The scale doesn t work or the low voltage symbol comes out after turning on Trouble of the PCB The phenomena are as following a Trouble of display board the display is abnormal or shows nothing b Trouble of main board There is nothing in the display when turn on the scale m The scale can not be powered on m The weighing is unstable The internal resolution is out of the normal range c Trouble of RS 232 board The scale doesn t transmit any data Il To solve the trouble 1 The scale can not be powered on The scale can not be powered on The switch is damaged The adapter is damaged The AC power indicator light is lighten Short the on of
5. f switch to check if the scale can work well Check the output voltage of adapter is about 16V The AC jack for adapter is damaged replace it The output voltage of IC L7808 is about 8v Short the audion T2 8550 to check if the scale can work well The voltage balance between the pins of the Crystal Oscillator CR1 is around 0 20v Replace the main board to check if the trouble can be solved The IC L7808 is damaged The audion 8550is damaged The Crystal Oscillator is damaged Replace the main board 2 No display after turn on No display after turn on Replace the 6 cores cable to Clean it and fit it The trouble is on the check if the trouble can be well main board solved V The cable is damaged The Crystal The voltage balance Replace it Oscillator between the pins of The pins of LCD was soldered CR1 is the Crystal Oscillator faultily CR1 is around Solder it well Solder it well Replace the LCD the trouble can Replace the LCD Check if the CPU is fit well Replace the display The trouble is in board to check if the the display trouble can be board solved damaged Replace it 0 20v Y N The display driver IC 8576D was a soldered faultily The trouble is in CPU N Y Y 89C52 replace it be solved Replace the display board 3 RS232 don t transmit any data RS232 don t Check if the setting of Check the voltage Check
6. ill be as COUNT gt gt BC CAL rPcs ZN 4 WEIGHT g UNIT WEIGHT wl G00 i Eeee Note When the scale was calibrated in Country A and it is used in Country B the error coefficient R should be CHINA Gravity value 9 79134 i R gravity value in Country A gravity value in Country B
7. le can be solved Replace the 40 cores socket to check if the trouble can be solved The resistor RX2 is damaged replace it The key is damaged replace it The cable is damaged replace it The CPU is damaged replace it The socket is damaged replace it 6 The display is incomplete or exceptional The display is incomplete or Replace the 6 cores cable The cable was damaged exceptional Then the trouble is solved Replace the display board The pins of LCD were soldered And the trouble can be solved faultily Or the IC 8576 was soldered faultily The main board was damaged Replace it Replace the LCD Then the trouble can be solved Re solder them N Y The LCD was damaged Replace it The IC 8576 was damaged Replace it Note Since this series of balance is with high precision it is very easy to be affected by clime and temperature Sometimes the scale has the following phenomena 1 Weighing is inaccurate The problem can be solved by re calibration 2 After self check the display shows error messages E1 Re calibrate the scale to solve it E3 Re calibrate the scale or replace the load cell to solve it 3 If any one of main board and load cell is changed the scale must be recalibrated lll Calibration procedure 1 Type Switch on Press 83419 to enter into Calibration mode during self checking The windows show as follow 2 Type2 After pressing On Off
8. oose capacity a The display shows COUNT gt al XXXXXX Pes RI 4 WEIGHT g UNIT WEIGHT gt 04 4 XXXXXX CAE orc NET rm b Press the MOVE key to select the capacity value PL refer to the below list Capacity The value should be choosen 1 5kg X 0 05g 150000 3kg X0 1g 30000 6kg X 0 2g 60000 15kg X0 5g 150000 30kg X 1g 30000 3kg X 0 05g 300000 6kg X0 1g 60000 15kg X 0 2g 150000 30kg X 0 5g 300000 0 lt NET 0 lt NET C Press the ENTER key to confirm at the same time enters into Choosing Dot Position model and the display shows Bal cooeoar ZN 4 WEIGHT g UNIT WEIGHT XXXXXX dot g PC o d Press the MOVE key to move the Dot Position Then Press the ENTER key to confirm and enter into Calibration Mode the display shows as below COUNT gt a XXXXXX rcs RI 4 WEIGHT g UNIT WEIGHT XXXXXX 0 O g PC ay ig Calibration Mode Touch the pan by hand lightly several seconds later the unit weight window shows 01 and the weight window shows the weight value 1 3 Max of full capacity which should be put on for the first time Put on the weight refer to the display Several seconds later the unit weight window shows 02 and the weight window shows the weight value 2 3 Max of full capacity which should be put on for the second time Put on the weight refer to the display Several seconds later the
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