1. When detecting the filter capacitor in the power supply, first short-circuit the positive and negative poles of the electrolytic capacitor, and do not need to use the test lead wire instead of the wire to discharge the capacitor when short-circuiting, because the core wire is randomly burned. A 220V, 60-100W lamp with a lamp lead can be taken at both ends of the capacitor, and the bulb will flash when discharged. 3. When testing the instrument in a humid environment, it is necessary to measure the various points of the printed circuit with a multimeter. Because of the important problem in this situation, the copper foil is corroded. 4. When inspecting the external circuit of the instrument, it is assumed that the contacts of the device components and the circuit board are coated with insulating varnish. When measuring the parameters of each point, ordinary hand-stitching can be used to weld the pen on the multimeter, so as to pierce the paint layer and measure each point indirectly. It is not necessary to peel off the paint layer over a large area. 5. When assembling and adjusting the instrument, the original status should be recorded in order to recover. 6. When repairing fine instruments and meters, if you accidentally fly small parts, you should first determine the position where you can fly. Do not look east, turn it over, you can use magnet scanning and visual field scanning to find. 7. When using the logic pen and oscilloscope to detect the signal, be careful not to make the probe contact the two measuring pins together. Because the essence of this condition is to form a short circuit under power-on conditions. 8. It is not necessary to arbitrarily knock and knock when testing, in order to prevent the expansion of the problem, the more repaired the worse.
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2. It is not necessary to plug and unplug various control boards and plugs.
The information here is provided free of charge by Jiangsu Jinhu Aotemei Automation Instrument Factory, hoping to bring more help to those in need.