Matters Needing Attention In Maintaining Office Equipment

Nowadays, a variety of office equipment has become an indispensable helper in people's work and life.

When these equipments are damaged and need to be repaired, they must be especially careful. If they are not noticed, they will expand the scope of the faults or make the faults more complicated, which will make the maintenance process more difficult.

In the maintenance work, we should pay attention to the following points: 1, not at random.

Usually, in the case of power supply, a strong induction electromotive force will be generated at the moment of plugging, which is enough to burn all kinds of chips, boards or interfaces.

2, live detection must be careful.

To prevent short circuit phenomenon caused by using tweezers and screwdrivers, and avoid touching the AC power cord, large capacitance or other high voltage parts, so as to avoid electric shock.

3, anti static.

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 again, and must not be dragged or pulled hard to prevent breakage of printed circuit boards or loose metal holes.

In the maintenance work, we must not blindly weld and dismantle, and do not twist the adjustable parts and potentiometers at random, so as not to make the working point of the whole machine scrambling and cause unnecessary trouble.

5, when replacing IC and electronic components, the power supply must be cut off to ensure human-machine safety.

Replacement of integrated circuits and electronic components should not be optional.

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.

The repaired integrated circuits and electronic components must be inspected and cleaned. The screws, nuts, lead wires and solder paste must be cleaned up in advance to prevent accidents.