A number of plant electricians and old home mechanics are stuck in the bottlenecks: they can only replace their electric caps, insurance, etc., year-round, and they can't do anything with the stickers, the drive boards, and the salaries are standing at 56,000. In order to transform the maintenance of the circuitboard chip, three months of routine board and power board maintenance can be carried out independently, without the need to eat the whole text with no purpose, to hold on to five core skills and to exercise gradually。
First: a universal watch online precision detector device. This is the top priority in terms of entry, abandoning the old habit of blindly disassembly measurements, and being proficient in the use of diodes to distinguish the mos tube from the good and bad of the current tube online and to learn to measure the capacity of the electricity offline. The vast majority of power failures have their origin in power components, which are trained to screen 60 per cent of the failure and avoid unnecessary welding damage to pcb. Many teachers have returned to work, and the root cause of this is speculation。
Second: local circuit mapping capability. Instead of cutting through the whole complex matrix, priority is given to cutting down power input, steady pressure and driving three basic circuits. Access to the faultboard will lock the power supply area and follow the line in pursuit of the failure point. Having read the local drawings, it is highly efficient to encounter an inexplicable short circuit, unopenable, and rapidly reduce the range of failures。
Third: paste component and simple bga welding. Today, the frequency transformer and the server control panel are all stickers, which are finely drawn. Skilled heat gun, temperature-removed patches, and mastery of the simple master bga, are mandatory conditions for the delivery of precision plates. No welding, no good failure judgement, no repair, no handing over high-priced orders。
Fourth: drive-back failure screening. The high frequency, switch and power failure were concentrated on igbt and the perimeter-driven circuits and were also the most expensive plates to maintain. Understanding the measurement logic of driving radials, driving electrical resistance, can address equipment overflows, carrying much of the jumper's disease, and learn then that single maintenance costs break thousands of dollars, opening the income gap between ordinary replacement masters。
Fifth: invisible screening for the ageing of the electrical capacity. An electric drum leak can be seen at first sight, but the loss of capacity, the invisible failure of the esr, which is indistinguishable, is also the cause of intermittent failure. Learning to use the electrocapacitor slot to measure the capacity and to distinguish between false aging capacitors will solve the problem of normal, miscalculation in space and significantly reduce the recovery rate。
The study was conducted in shallow depth, with the first month feeding through the component measurements and base maps, the second month focusing on the welding of tablets, and the third month of deep tilling driving circuits and the screening of hidden components. Gradual down-to-the-ground exercise, with repeated practice on the scrap slabs, will allow three months to jump out of the lower end of the circle and turn to chip-level circuit board maintenance, with price and income naturally rising steadily。
