Service Manual for ECB counting scale
Contents
1. The switch Y Short the on off is switch to check if the scale can work well Check the Short the audion The audion 8550is output voltage T3 8550 to check if the damaged of adapter is scale can work well about 17V damaged The adapter is The AC jack for adapter The voltage balance The Crystal damaged is damaged replace it between the pins of the Oscillator is Crystal Oscillator CR1 damaged is around 0 20v Replace the CPU to Replace the main check if the trouble can board be solved 2 No display after turn on No display after Check the Check the display Re solder it to check if turn on voltage of 8 pin driver is soldered the trouble can be of U2 is 5v well solved Clean it and fit it well Check if the Replace the display CPU is fit well driver and solder it well The trouble is in CPU 89C52 The voltage balance replace it between the pins of the Crystal Oscillator CR1 is around 0 20v Replace the main board The Crystal Oscillator CR1 is damaged Replace it 3 RS232 don t transmit any data RS232 don t Check if the setting of Check the voltage Check 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 U10 The Check the 3 cores cable is dam2. display shows as below WEIGHT UNIT WEIGHT COUNT 120045 Pe 365723 v v Z gt 04 NET Increased internal resolution Current total internal resolution d Press the SET key again the display shows WEIGHT UNIT WEIGHT COUNT 0 000 2 265703 oe NET 5 gt BC e Take away the load the scale is back to calibration mode The display shows WEIGHT UNIT WEIGHT COUNT 0 000 a bk 245678 ZA gt 04 NET After a while you will hear a beeper The display shows WEIGHT UNIT WEIGHT COUNT SOOO zOk 245678 vv kg g PCS ZS gt 04 NET a8 0 BO Simple calibration without weight 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 150kg scale for instance 0 000 150 000 oh POOE Required weight 150 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 WEIGHT UNIT WEIGHT COUNT vv Z7 gt 04NET O OX b If the error coefficient
3. Service Manual for ECB counting scale I Phenomena of trouble 1 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 2 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 3 Trouble of power supply The phenomenon is as following The scale doesn t work or the low voltage symbol comes out after turning on 4 Trouble of the PCB The phenomena are as following Trouble of main board There is nothing in the display when turn on the scale The scale can not be powered on The weighing is unstable The internal resolution is out of the normal range The display is abnormal or shows nothing The scale doesn t transmit any data II To solve the trouble 1 The scale can not be powered on The scale The AC power Y The voltage of can not be indicator light is Y The output The audion T1 N Replace the T1C is about voltage of T1B is damaged diode 10 5v is about 8v Replace it powered lighten
4. aged replace it trouble can be solved living N N Replace the AD202EA The voltage balance Replace the between the pins of 3 cores cable the Crystal Oscillator CR2 is around 0 20v Replace the CPU The Crystal 89C2052 and the Oscillator is trouble can be damaged solved Replace it 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 Re solder the Clean it and solder it well AD5530 Then recalibrate the scale Replace the A D module 5 The keys don t work The keys don t work Short the key by using a forceps the trouble can be solved Check the resistance value of resistor RP1 is right Replace the CPU 89C52 to check if the trouble 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 Replace the Resistor Array 9P The CPU is damaged replace it The socket is da
5. e 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 Note 1 There are four calibration weight values CAPO CAP3 You are supposed to set at least two calibration weight values 2 If the number of calibration weight value is less than four press SET key after set the last weight value and enter into the next calibration value setting mode Then weight display window show END press ENTER key to move to calibration mode 3 The other way to enter into calibration mode is press CAL switch on the back of the indicator during the self checking Buy using this method there is no need to change the unit capacity and calibration weight 3 Check the internal resolution a Press 83419 or CAL switch during self checking to enter into the calibration mode The display shows as below WEIGHT UNIT WEIGHT COUNT GOO 245678 PCS ZB gt 0 lt NET 5 gt BC b Press SET key to check the internal resolution The display shows as below WEIGHT UNIT WEIGHT COUNT Z gt 0 lt NET gt B amp D Current internal resolution c Put on some weight The weight display window shows the increased internal resolution and the count window shows the total internal resolution which is equal to the original one and the increased internal resolution The
6. is 1 23456 then the display will be as 0 000 193456 pee RoE oy gt BO Note When the scale was calibrated in Country A and it is used in Country B the error coefficient R should be R gravity value in Country A gravity value in Country B
7. maged 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 Switch on Press 83419 to enter into Calibration mode during self checking The windows show as follows WEIGHT UNIT WEIGHT COUNT 000000 24 5670 vv kg g PCS Z gt 04 NET a 5 gt BO Internal resolution Touch the pan by hand lightly to do the calibration if there is no need to change the weight units accuracy and capacity 2 Change and choose the weight units accuracy and capacity by using the ENTER a
8. nd enter into Set the first calibration value mode the display shows as below Le CAP E 245678 am gt BD e Use the numerical keys to key in the first calibration value Then Press the ENTER key to confirm and enter into Set the second calibration value mode the display shows as below 100 JE ARa 245678 ETETE gt BO f Use the numerical keys to key in the first calibration value Then Press the ENTER key to confirm and enter into Set the third calibration value mode the display shows as below WEIGHT UNIT WEIGHT COUNT ZX gt 0 lt NET 9 ool Use the numerical keys to key in the first calibration value Then Press the ENTER key to confirm and enter into the first step calibration mode The display shows as below WEIGHT UNIT WEIGHT COUNT ZA gt 04 NET Seere Calibration Mode Touch the pan by hand lightly several seconds later the unit weight window shows 01 and the weight window shows the first calibration weight value 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 second calibration weight value which should be put on for the second time Put on the weight refer to the display Several seconds later the unit weight window shows 03 and the weight window shows the third calibration weight value which should be put on for th
9. nd the MOVE key 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 WEIGHT UNIT WEIGHT COUNT 103 g Unit 245678 a PCS Z gt 0 lt NET 5 gt BC Weighing unit Internal resolution b Press the MOVE key to change the value Ib 103g kg 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 WEIGHT UNIT WEIGHT COUNT 000000 sete l 245678 Z gt 04 NET Choose accuracy value a The display shows WEIGHT UNIT WEIGHT COUNT 245678 v v g PCS Z gt 04NET o OA 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 Choose capacity a The display shows 150 00 sal 245678 So gt BO b Use the 0 9 numerical keys to key in the capacity The weighing unit is kg C Press the ENTER key to confirm at the same time enters into Set the zero calibration value mode and the display shows L RES ZCAPOJ 245678 Z gt 04 NET d Use the numerical keys to key in the zero calibration value 0 Then Press the ENTER key to confirm a
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