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2. When detecting the filter capacitor in the power supply, the positive and negative electrodes of the electrolytic capacitor should be short-circuited first, and the short-circuit line should not be used to discharge the capacitor instead of the lead wire, because it is easy to blow the core wire. It is possible to take a 220V, 60 to 100W lamp with a cap lead, which is connected to both ends of the capacitor. The lamp will flash at the moment of discharge.
3. When troubleshooting a meter in a wet environment, it is necessary to measure whether the various points on the printed circuit are unobstructed, because the main fault in this case is corrosion of the copper foil.
4. When the internal circuit of the instrument is repaired, if the contacts and the circuit board of the mounting component are coated with insulating varnish, the parameters of each point can be measured by using an ordinary hand-sewn welding needle on the surface of the multimeter to directly measure the points by piercing the paint layer. There is no need to peel off the paint layer.
5. Do not hot plug various control boards and plugs. Because in the case of power-up, the plug-in control board will generate a strong induced electromotive force, then instantaneous counterattack voltage is very high, it is easy to damage the corresponding control board and plug.
6, do not blindly knock overhaul during maintenance, so as not to expand the fault, the more repair and more bad. Side-mounted magnetic flap level gauge 7, when disassembling, adjusting the instrument, should record the original position in order to restore.
8. When repairing precision instruments and meters, if you inadvertently fly a small part, you should first determine where it may fly, and do not look east. If you turn it west, you can use magnet scanning and line-of-sight scanning methods.
Side-mounted magnetic flap level gauge troubleshooting
Remember not to measure with electricity. 1. When using a logic pen or oscilloscope to detect signals, be careful not to make the probe contact both measurement pins at the same time because the essence of this situation is to form a short circuit under power-up.