1. When using a multimeter ohm, remember not to measure with electricity.
2. When using the logic pen and oscilloscope to detect the signal, it is necessary to pay attention not to make the probe contact the two measurement pins together, because the essence of this situation is to constitute a short circuit in the case of power-on.
3. When detecting the filter capacitor in the power supply, the positive and negative poles of the electrolytic capacitor should be short-circuited first, and do not use the meter pen wire instead of the wire to discharge the capacitor when the short circuit is short-circuited, because it is so simple to burn the core wire. You can take a 220V, 60-100W lamp with a lamp head lead, connect it to both ends of the capacitor, and the bulb will light up at the moment of discharge.
4. When repairing the appearance of the problem in a humid environment, it is necessary to use a multimeter to measure whether the points of the printed circuit are clear, because the main problem in this case is copper foil corrosion.
5. When overhauling the internal circuit of the surface, if the contacts and circuit boards of the device components are coated with insulating varnish, when measuring the parameters of each point, the general hand-sewn needle can be welded on the table pen of the multimeter to pierce the paint layer and measure each point directly, without having to peel off the paint layer in a large area.
6. Do not plug and unplug various control boards and plugs with electricity. Because in the case of power-on, plugging and unplugging the control board will produce a strong induced electromotive force, and the instantaneous counterattack voltage is very high, and it is very simple to damage the corresponding control board and plug.
7. Don't blindly knock and bump when overhauling, to avoid expanding the problem, the more you repair, the worse it gets.
8. When disassembling and adjusting the appearance, the original orientation should be recorded for restoration.
9. When repairing the appearance of precision instruments, if you accidentally bounce small parts away, you should first identify the place where you may fly down, do not look for it in the east or turn it in the west, you can use magnet scanning and line of sight scanning methods to find it.
In short, in the maintenance of the appearance of the instrument, first of all, we should understand the basic principles of the appearance of the instrument, and master the knowledge and technology of the relevant electronics, and should prepare all the technical information such as the manuals and drawings of the appearance of the instrument.
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