Maintenance of instrument nine matters needing attention:

    1, using a multimeter ohm gear, don't live line measurement.

    2, the use of logical pen, oscilloscope signal, attention should be paid to not make the probe contact two measuringpin at the same time, because the essence of this is the formation of short circuit in the power case.

    The filter capacitor 3, detection in power supply, should be first and electrolytic capacitors are very short, but withpen line instead of wires to discharge the capacitor is not short, because it's easy to burn off the core wire. You cantake a lamp head with lead 220V, 60 ~ 100W lamp, both ends connected to the capacitor, discharge at the momentlamp will flash.

    4, in a damp environment maintenance instrument failure, the printed circuit using a multimeter to measure eachpoint whether unobstructed is necessary, because the main fault in this case is the copper corrosion.

    5, maintenance of instrument internal circuit, if the insulating varnish contact and a circuit board mounted components on the painted, measure the parameters can be used in ordinary hand sewing welding multimeter pen,to pierce the paint layer directly the measurement points, instead of large areas of paint stripping.

    6, do not plug charged various control board and plug. Because of the power case, plug control board will produce electromotive force strong, then instantly counterattack voltage is very high, it is easy to damage control board and the corresponding plug.

    7, do not blindly maintenance struck the touch, so as not to expand the fault, more and more bad repair.

    8, demolition, the adjustment instrument, should be recorded in the original position, in order to recover.

    9, repair of precision instruments, such as inadvertently small parts flew, should first judgment may fall in place, do not look at the East, West's turning over, can take the magnet scanning and line scanning method for.

In short, in the instrument repair work, should first understand the basic principle of instrument, and master the relevant electronic knowledge and skills, but also should prepare all the instrument specifications, drawings and other technical information, also should develop a good working quality, so as to improve the efficiency in theinstrument repair work, reduce errors.