Instrument failure is a problem we often encounter in our work, so what are the best ways to judge the fault and find out the problem? The following small series has sorted out 10 methods of fault analysis and judgment of din 41612 type b connectors wholesale for you, and summarized many years of instrument maintenance experience, hoping to be helpful to you.

1 Visual inspection method

Without any testing equipment, through the human senses (eyes, ears, nose, hands) to observe and find the fault method. Visual inspection method is divided into two kinds: appearance inspection and boot inspection.

The contents of appearance inspection mainly include:

① Whether the instrument housing and dial glass are intact, whether the pointer is deformed or colliding with the dial, whether the assembly fasteners are firm, whether the position of the switch knob is correct, whether the moving part is flexible, and whether the adjustment part has obvious changes;

(2) Whether the connection is disconnected, whether the connectors are normally connected, whether the reed on the circuit board socket has insufficient elasticity and poor contact, for the instrument that uses the unit combination assembly, pay special attention to whether the connection screws of each unit board are tightened;

③ Whether the contact of each relay and contactor is misaligned, stuck, oxidized, burnt and sticky;

④ Power supply protection. Whether the fuse is broken, whether the valve is broken, air leakage (after the leak, the inner wall of the tube is attached with a layer of white powder), damage, whether the transistor shell is painted discolored, broken pole, whether the resistor is burnt, whether the coil is broken, whether the capacitor shell is expanded, leaky, burst;

⑤ Whether the copper strip of the printed plate is broken, tin, short circuit, whether the solder joints of each component are good, and whether there is virtual welding, leakage welding, and de-welding phenomenon;

⑥ Whether the arrangement and wiring of the parts are skewed, misplaced, falling off, and colliding.

Boot check mainly includes:

① The power indicator light, each tube and other light-emitting elements in the machine are energized and bright;

② There is no high pressure ignition, discharge, yan phenomenon in the machine;

(3) There is no vibration and a crackling sound, friction sound, bumping sound;

(4) Whether the temperature rise of heat-generating components such as transformers, motors, power amplifier tubes and resistors and integrated blocks is normal, and whether there is hot hand phenomenon;

⑤ There is no special smell in the machine, such as the burnt smell of the transformer resistance due to the burnt insulation layer, and the oscilloscope tube is high. The smell of self-oxygen caused by the ionization of air by pressure leakage ignition;

⑥ Whether the mechanical transmission part is operating normally, whether the gear mesh is not good, stuck and serious wear, slip deformation, transmission failure and other phenomena.

Visual inspection must be very careful and careful, do not be careless and impatient. When checking the components and wires, you can only gently shake, not too hard, to prevent the components, wires and printed copper foil. Do not turn off the power switch when the power is turned on. If any abnormality is found, turn it off in time. Pay special attention to personal safety and avoid touching live equipment with both hands at the same time. The large capacity filter capacitor in the power supply circuit has a charging charge in the circuit to prevent electric shock.

2 Investigation Method

Through the investigation and understanding of the fault phenomenon and its development process, analyze the method of judging the cause of the fault. Generally there are the following aspects:

① The use of the fault before the occurrence of any warning;

(2) When the fault occurs, there is no ignition, yan, abnormal odor and other phenomena;

③ Changes in supply voltage;

④ Overheating, lightning, humidity, collision and other external conditions;

⑤ whether it is interfered by external strong electric and magnetic fields;

⑥ Whether there is improper use or misoperation;

⑦ Failure in normal use, or failure after repair and replacement of components;

⑧ What failures and repairs have occurred before.

Use the investigation method to repair the fault, the investigation and understanding should be in-depth and careful, especially the reflection of the on-site user should be verified, and do not rush to disassemble and repair. Maintenance experience has shown that many of the user's responses are incorrect or incomplete, and many problems that do not need maintenance can be found through verification.

3 Circuit breaking method

The suspected part is disconnected from the whole machine or unit circuit to see if the fault can disappear, so as to determine the fault.

After the failure of the instrument, the first preliminary judgment of several possibilities of failure. In the fault range area, disconnect the suspicious part of the circuit to determine whether the fault occurred before or after disconnection. If the power inspection finds that the fault disappears, it indicates that the fault is more in the disconnected circuit, such as the fault still exists, and then do further open circuit segmentation inspection, gradually eliminate doubts, reduce the scope of the fault, until the real cause of the fault is found.

The open circuit method is particularly convenient for the fault inspection of the instrument with unit, combination and plug-in, and it is also very convenient for some short-circuit faults with too much current. Yes. However, it is not suitable for closed system circuit or direct coupling circuit structure with large circuit.

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