1. Don't blindly knock and bump when overhauling to avoid expansion failures, and the more you repair, the worse it gets.
2. Do not plug and unplug various control boards and plugs with electricity. Because in the power-on condition, 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.
3. When using a logic pen and oscilloscope to detect the signal, be careful not to make the probe touch the two measurement pins at the same time, because the essence of this situation is to form a short circuit under the condition of power-on.
4. When disassembling and adjusting the instrument, the original orientation should be recorded for restoration.
5. 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 to replace the wire to discharge the capacitor when the short circuit is short-circuited. 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 flash at the moment of discharge.
6. When repairing instrument failures in a humid environment, it is necessary to use a multimeter to measure whether each point of the printed circuit is clear, because the main fault in this situation is copper foil corrosion.
7. When overhauling the internal circuit of the instrument, if the contacts of the device components and the circuit board are coated with insulating varnish, the parameters of each point can be welded to the table pen of the multimeter with a general hand-sewn needle, so as to pierce the paint layer and directly measure each point, without having to peel off the paint layer in a large area.
8. When using a multimeter ohm, remember not to measure with electricity.
9. When repairing precision instruments, if you accidentally bounce small parts away, you should first identify the place that may fly down, do not look for it in the east or turn it in the west, you can take magnet scanning and field of view scanning methods to find.
In short, in the maintenance of instrumentation, first of all, we should understand the basic principles of instrumentation, and master the knowledge and skills related to electronics, and should prepare all the technical information such as manuals and drawings of instrumentation, and should develop a good working essence, so as to improve efficiency and reduce errors in the maintenance of instrumentation.
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