1. When repairing the internal circuit of the Handheld Ethernet Tester, if the contact points of the mounted components and the circuit board are coated with insulating varnish, the parameters of each point can be measured by ordinary hand stitching on the test chart of the multimeter, so as to pierce the paint layer and directly measure the points. It is not necessary to peel off the paint layer over a large area.
2. Do not plug and unplug various control boards and plugs. Because in the case of power-on, the plug-in control board will generate a strong induced electromotive force, and the instantaneous counter-attack voltage is very high, which easily damages the corresponding control board and plug.
3. Don't blindly knock and bump when you are overhauling, so as not to expand the fault, the more you repair it.
4. When disassembling and adjusting the China Portable Ethernet Tester, the original position should be recorded for recovery.
5. When repairing precision instrumentation, if you accidentally fly a small part, you should first judge where it may fly. Do not look east, turn it over, you can use magnet scanning and line-of-sight scanning method to find.