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| Top > Recall > Ignition from the power supply board |
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| cause |
| The fuse resistor was buried in resin and did not melt properly when the circuit malfunctioned. |
| consideration |
| At the initial stage of power supply design, the fuse resistor was
not buried in resin. After passing safety/reliability tests (especially open/short tests) The temperature rise of parts became a problem, and it was necessary to fill them with resin. We started mass production without noticing that fuse resistors should not be filled with resin. |
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| important point |
| Why did you use a fuse resistor? ... for cost reduction? The open/short test was not performed again after resin filling. No one knew that fuse resistors should not be resin-filled. |
| best way |
| Use safety standard certified fuses instead of fuse resistors. |
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