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Brown spots on PCB


MTVDNA
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Posted · Brown spots on PCB

Hey,

I will probably be replacing my feeder motor, so I screwed off the pcb cover to see what the connectors for the steppers look like. I noticed some brown spots on the pcb:

5a331fe2edf24_Photo07-08-16133031.thumb.jpg.7c08d6dbb72505b5cb8a5d18b03aa81a.jpg

5a331fe2a95d0_Photo07-08-16133122.thumb.jpg.8674e8a19de0fc39d46053b7998bc530.jpg

Is this normal? My machine has been on for about 3900 h, and has printed about 2500 h.

5a331fe2edf24_Photo07-08-16133031.thumb.jpg.7c08d6dbb72505b5cb8a5d18b03aa81a.jpg

5a331fe2a95d0_Photo07-08-16133122.thumb.jpg.8674e8a19de0fc39d46053b7998bc530.jpg

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    Posted · Brown spots on PCB

    Well I don't consider it normal... but mine looks the same already for a long time so it's probably no problem...

     

    Well, white plastic gets brown with heat. That's normal. But of course one would not see it if the plastic would have a different color. That's maybe one reason why in the past all pcbs were green or brown... ;)

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    Posted · Brown spots on PCB

    Well the Arduino is blue,..

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    Posted · Brown spots on PCB

    Thanks guys, that's reassuring. I was not looking forward to having to replace the board, this hobby is expensive enough as it is :p

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    Posted · Brown spots on PCB

    The brown spots do indicate degradation from heat.

    I drilled some holes in the metal cover under the driver area, to improve cooling there.

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