During the investigation, the e6 optics error was reproduced.When the device was disassembled, it was noted that the program chip was damaged and showed signs of oxidation and one of the four metal strips was blackened at the end.This is characteristic of the chip being short-circuited by a liquid being present.There was also a clearly visible liquid mark near the chip's socket.The root cause was determined to be that liquid got into the program chip's socket and caused the short-circuiting of the chip due to an operator handling error.
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