Problem example 1
On the telegram OC problem, measure the 5, 6, and 7 pins of N1 to be 2V. Pin 7 is not 0V for the alarm reason.
1. The "imaginary short" rule of the amplifier is still established, and the N1 chip is good to judge, but the fault is in the bias circuit.
2. Further analysis, at this moment, the differential amplifier has been transformed into a voltage follower.
It is judged that R3 is broken, virtual welding, or the resistance value is severe. One end of R3 was measured to be soldered, and the recovery was normal after repair welding.
Problem example two
The problem phenomenon is the same as above. Pin 5 is 2V, pin 6 is 2.5V, and pin 7 is -13V.
1. The "imaginary short" rule of the amplifier cannot be established, but it still conforms to the rule of voltage comparators.
2. Further analysis, at this moment, the differential amplifier is transformed into a voltage comparator.
The N1 chip is judged to be good, but the fault is R4 open circuit or virtual soldering, which damages the closed-loop condition of the amplifier, so that the amplifier is transformed into a voltage comparator. The resistance value of the online detection R4 has become severely larger, and the circuit is now broken after removing the detection, and the recovery is normal after replacement.
Problem example three
The problem phenomenon is the same as above. Pin 5 is 0V, pin 6 is 0V, and pin 7 is -10V.
1. The "virtual short" of the amplifier and the "virtual ground" rule of the inverting amplifier are still established, and the N1 chip is good.
2. Further analysis, at this moment, the differential amplifier is transformed into an inverting amplifier.
The discrimination problem is that R1 is open or soldered, which causes the input signal voltage at the inverting input terminal to be lost, while the 2.5V at the inverting input terminal is amplified by four times the inverting phase. Check that R1 has a virtual welding phenomenon, and the fault is eliminated after repair welding.
Problem example four
The problem phenomenon is the same as above. Pin 5, 6 and Pin 7 are all 2.5V.
1. The "virtual short" rule of the amplifier is still established, and the N1 chip is good.
2. Further analysis, at this moment, due to the abnormality of the voltage divider circuit at the inverting input terminal, the "output virtual ground" condition of the original differential amplifier is damaged. Therefore, the output voltage rises from 0V to 2.5V.
The identification problem is that R2 is open circuit or virtual soldering, which causes the input voltage at the inverting input terminal to rise. The measurement is as discriminant, and the output of N1 is normal after replacing R2.
Problem example five
The problem phenomenon is the same as above. The pin voltage is 2V, pin 6 is 0.4V, and pin 7 is -8V.
1. The "imaginary short" rule of the amplifier cannot be established.
2. In order to settle for the second, the N1 chip no longer even fits the criteria of the comparator, and the complete "dereliction of duty" becomes unreasonable. No, the N1 chip is now broken, and there is no need to check the peripheral components to identify it. Replace the N1 chip and recover to work normally.
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