Abstract：X-ray fluorescence spectrometer (XRF) has been widely used in laboratory of some industries such as metallurgy and mining. In proposed study, ARL9900 series XRF was used as an example. The fault phenomenon and alarm information of optical coupling chip on XPS circuit board and IGBT chip on XPSI circuit board were introduced. The checking and treatment of damaged components on circuit board using circuitry principle and electronic knowledge were also introduced. The treatment method of chip-level fault on two typical circuit boards provided a new ideal for the chip-level repairing of precise instruments in laboratory. It could help the enterprises resume the production rapidly and save the cost of spare parts.
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