The electronic universal test machine is turned on and shows this situation in 1999. It is possible that the CPU operating frequency (11.0592MHz) is abnormal, and the crystal oscillator is replaced. If the voltage of the two sensors is too high (usually a few millivolts), check if the sensor is normal. The general data obtained by the multimeter electric blocking measuring sensor is: 405Ω at the input end; 340Ω at the output end; The resistance of the two leads at one end is 280 Ω. Note: The data of the sensor input and output sometimes varies with the manufacturer, but the change is a certain proportion. If the comparison voltage of the two op amps is abnormal, does the resistance of pins 2 and 3 of the measuring amplifier change? If the resistance value occurs, it should be replaced. If the above conditions are normal, the electronic universal testing machine operational amplifier is damaged and should be replaced. If the value of the power supply is unstable, you need to configure a regulated power supply.
If the amplifier output voltage is unstable, replace the amplifier. Check the CPU frequency (11.0592MHz) and whether the comparison voltage is stable or drifting. If there is a problem of solder joint, re-soldering; if the performance of the component is deteriorated, it should be replaced to check whether the circuit board is damp or oily, and necessary cleaning and do Good drying work. If the power transformer has input and no output, replace the transformer or re-wind the transformer; if the voltage regulator circuit is not normal, check the corresponding bridge diode and filter capacitor and the corresponding connection line, and replace the damaged one. The solder joint or open circuit should be re-welded. Check if the digital circuit voltage is +5V.
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