What are the rules for PCB circuit board repair?

Be aware of the vulnerable parts on the circuit board when repairing

l. Places with unreasonable design are most likely to malfunction.

What are the unreasonable design aspects of industrial circuit boards? The first is the heat dissipation problem. Many circuit board damages are caused by poor heat dissipation design. The second is the copper foil wire of the printed board. The copper foil of the power supply line of the poor quality circuit board is very thin and can easily burn out due to overcurrent. , making the motherboard unable to work.

2. Frequently used places are prone to malfunctions.

For example, the drive motors and rotating shafts of industrial circuit boards, switch tubes of switching power supplies, and commonly used buttons on operation panels, etc.

3. Components with heavy load, high power and high working voltage are most prone to failure.

The power supplies, drive circuits, power control devices, operational amplifiers, etc. of industrial circuit boards are the most vulnerable to damage. These components are generally close to the heat sink. If the protection measures are not enough and the heat dissipation is not good, they can easily become the first “victims”. “.

4. The protection circuit is most easily damaged

The valuable chips or components on the circuit boards of the circuit board factory are equipped with protection. Once the equipment becomes abnormal, these protection circuits will be sacrificed first. These protective devices should be identifiable at a glance during maintenance.

5. The interfaces and cables of inline sockets, connectors and cables are prone to poor contact or disconnection.

For example, poor contact between the board and the slot, poor communication when the cable is broken internally, poor contact between the wire plug and terminal block, and weak soldering of components, etc. all fall into this category.