Analysis of Electrical Malfunctions in Times of Good and Times of Bad

The main causes of electrical faults, whether good or bad, can be attributed to the following situations:

1. Poor contact

Poor contact between the board and slot, intermittent connection and disconnection caused by internal cable breakage, poor contact of wire plugs and terminals, and virtual soldering of equipment all belong to this type of problem. These problems are mostly external wiring issues. In addition to the problem of broken line cables, other problems require us to carefully check and confirm during the maintenance process to basically solve them.

2. Signal disturbance

For most digital circuits, faults will only appear under specific conditions. It is possible that there is indeed a phenomenon of excessive disturbance, which affects the control system and causes errors. If the parameters of individual components or overall performance parameters in the circuit board change, causing the anti-interference ability to approach the critical point, then the fault will appear;

3. Poor thermal stability of the equipment

Based on theory and extensive maintenance practice, the component with poor thermal stability in various equipment is the electrolytic capacitor mentioned above, followed by other capacitors, transistors, diodes, etc IC、 Resistance, etc;

4. Dust, moisture, etc. accumulate on the circuit board

It is precisely because moisture and dust can conduct electricity, have resistance effects but are ubiquitous and difficult to detect and remove. Their resistance size can also be affected by thermal expansion and contraction, and then presented in the form of parallel effects of other components in the circuit. If the influence of this resistance reaches a certain scale, it will affect the parameters of the entire circuit and lead to circuit problems;

5. Software is also an influencing factor

Many parameters in the circuit are adjusted and set through software. If the margin of certain parameters is set too low and at a critical scale, when the machine's operating conditions meet the criteria for software judgment of faults, an alarm condition will appear.

Article source: PCB manufacturerhttp://www.yonghongpcb.com/