1. INTRODUCTION The ADW-E series is designed and programmed according to the OIML R-76 Class III requirements. This scale is sealed to prevent unauthorized access to internal parts. Ender users should be advised not to undertake any trouble shooting except those listed on the operation manual. This maintenance manual contains of certain information that may result in fraudulent use.
2. SPECIFICATION 2.1 SYSTEM BLOCK DIAGRAM REAR LED DISPLAY LED DISPLAY DISPLAY DRIVER CIRCUIT CPU with ROM A/D UNIT INTERFACE POWER SUPPLY: 1. AC ADAPTOR KEYBOARD (9V 500mA) (4 KEYS) 2. RECHARGEABLE BATTERY(6V 4Ah) Description: When a mass is placed on the platform, the load of the article is applied to the load cell inside it.
2.2 PHYSICAL LAYOUT OF ELECTRICAL CONNECTION DW(LED)-40-X OPTIONAL REAR PISPLAY BOARD DC JACK LOAD CELL RECHARGEABLE BATTERY 6V 4Ah MAIN BOARD DW-12-X TO BATT. S- S+ E- E+ AC IN RS-232 BOARD DM-70-1...
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2.3.2 Dimension: Platter size:250 x 215mm Overall size:270(W) X 278(D) X 145(H) mm 2.3.3 Model Specifications Deleted: ¶ Model Number Capacity (Max) Division (e) Model Number ... [1] ADW-1500E 1500g 0.5g ADW-3000E 3000g ADW-6000E 6000g ADW-15KE 15kg 0.005kg ADW-30KE 30kg 0.01kg...
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2.4 CALIBRATION METHODS AUTO CALIBRATION a. Turn scale off b. Press and hold MODE, then press ON/ZERO c. Scale display CAL? d. Press MODE for YES and scale will self calibrate zero point e. After zero point is calibrated, Scale will displays “LOAD XXXX or YYYY”.
3. TROUBLE SHOOTING 3.1 TROUBLE SHOOTING LOOP POWER ON DISPLAY RANDOM NO DISPLAY FIGURE COUNT DOWN? CHECK POWER SUPPLY, CHECK CPU, CPU,TACT SW. 7-SEGMENT-LEDS, SHOW “00000” COUNTS AND THEN ZERO? CHECK LOAD CELL, A/D UNIT,OFFSET VALUE ZERO DRIFT UNSTABLE PROPER READOUT? CHECK PLATTER CHECK POWER STOPPER,LOAD...
3.2 PARTS AND COMPONENTS TROUBLE SHOOTING 3.2.1 Power Supply Checking 3.2.1.1 Relevant parts: Main Board (DW-12-X) Q5 (C1061) Q3 (C945) R41(1.2R 1/2W) ZD1(ZENER 8.2V) DC JACK BATTERY(6V 4Ah) Q1 (A1515) Q2 (C945) Q6 (A733) U6 (NS2950-5) Description: 1) Power source: Rechargeable Battery 6V/4Ah or AC adaptor(9V, 500mA) 2) How Battery is charged completely? The charging voltage is regulated by Q5 (C1061) and ZD1 (8.2V) for...
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4) Auto-off: If the scale is set with 4_oFF or even under LO-BAT situation, after fixed time interval, CPU will release a low potential signal to draw down Q2, then Q1 cuts off, the scale will be shut down immediately. 5) Low Power Detection: The Q6(A733) is designed to detect the power level.
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3.2.5.2 Check that the signal output of loadcell is normal. 3.2.5.3 Check OP. Amplifiers & A/D Converter (AD7705). When no error is found with the above checking procedures, the trouble can be caused on the loadcell or the PCB itself. Replace a new one could be better to identify the defective.
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