What Are The Precautions For Repairing Office Equipment?

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1. It is not allowed to pick up the control card (plate) and the connecting cable (plug) at random. Normally, when the power is supplied, it will generate strong induction electromotive force, which will burn out all kinds of chips, boards or interfaces.

2, live detection must be careful. Prevent short circuit phenomenon caused by using tweezers and screwdrivers and so on. Avoid touching the AC power cord and large capacitance or other high voltage parts, so as to avoid electric shock.

3. Antistatic. The sensitive range of integrated circuits and electronic components to electrostatic voltage is +25v ~ +1000v, which is easily harms by high electrostatic voltage.

In maintenance work, it is often found that the reasons for the failure of many office equipment are chip damage, and over 80% of chip damage is caused by electrostatic discharge.

Under normal circumstances, electrostatic discharge on office equipment such as fax machines can be roughly divided into two categories: one is voltage, and the other is voltage breakdown. After the breakdown of the oxide layer is caused by the high voltage across the oxide layer of the components, the short circuit is destroyed and the components are destroyed. The other is related to energy (power). The damage is caused by the collapse of the junction surface, resulting in a high current across the junction surface, resulting in the thermal effect caused by the current, resulting in local thermal concentration, resulting in the melting of silicon and aluminum metal and the formation of an un recoverable damage.

The ESD value of the chip is +500v to +2000v.

4, when the integrated circuit, electronic components and other multi pin components are selected, the solder paste should be removed and removed, and it must not be dragged or pulled hard to prevent breakage of printed boards or loose metal holes of multiply boards. In the maintenance work, we must not blindly disassemble and disassemble the parts, nor can we move the adjustable parts and potentiometers at random, so as to avoid messing up the working points of the whole machine and cause unnecessary trouble.

5, when replacing integrated circuits and electronic components, the power supply must be cut off to ensure the safety of human-machine. When replacing integrated circuits and electronic components, no substitute can be selected at will.

If other alternatives are not available for the same type, the same specification of integrated circuits and electronic components, we must find out the type of substitutes, the functions and parameters of each pin, and so on.

When replacing high-power components, heat dissipation equipment must be installed at the same time and fixed installation.

6. Cleaning. Overhaul of integrated circuits and electronic components must be checked and cleaned. The screws, nuts, lead and solder paste must be cleaned up in advance to prevent accidents.