Method: comparison method

The specific method is: let the faulty instruments and normal meter run in the same situation, and then two groups of signal detection of some points and then compare the measured, if different, it can be concluded that the failure in here. This approach requires repair personnel have considerable knowledge and skills.

Requires two same types of instrument, and one is the normal operation of the. Using this method will have the necessary equipment, for example, multimeter, oscilloscope. According to the comparison of the properties of cent, voltage, waveform comparison, comparative static impedance, output result comparison, current comparison.

Method two: bypass capacitor method

Shaoxing Zhongyi electronic alerts you when a circuit generates a strange phenomena, such as display chaos, can probably determine faulty circuit part with a bypass capacitor method.

Method three: insulation method

Fault isolation method does not require the same type of equipment or parts for comparison, safe and reliable. According to the flow chart of fault detection, fault segmentation surrounded gradually narrow the search range, coupled with the signal contrast, component exchange method, the general will soon find the fault location.

Method four: knock method

Often encounter instrument runtime HERSHEY'S bad phenomenon, the vast majority of this phenomenon is caused due to bad contact or weld. In this case can be used to knock and the hand pressing method.

The so-called "knocking" is about the possible fault position, through a small rubber hammer or other knocker gently tapping board or component, have a look whether can cause an error or malfunction of. The so-called "hand pressure" is the fault occurs, power off the plug components and plug and seat back hand firmly, and then try to boot will eliminate the fault. If it is found that the normal beat shell, then beat and is not normal, the best first of all joint weight inserted firmly and try again, if successful, he had to think of other ways.

Method five: state adjustment method

Generally speaking, in the fault before, don't touch the circuit components especially adjustable device is even more so, cases of potentiometer. But if the paperless recorder prior to taking the complex reference measures (for example, in intact before well position mark or measure voltage value or resistance value, etc.) or allowed to touch when necessary. Maybe change . Maybe change after sometimes fault will eliminate.

IC power supply and ground terminal on the circuit; transistor connected across the base input or output end of the collector, to observe its effect on the fault phenomena. If color paperless recorder bypass capacitor input is invalid disappear and bypass fault its output phenomenon, is to determine the fault appears in the first-order circuit.