shorted hot end cooling fan.
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accidentally shorted the hot end cooling fan. Always on fans work fine, but fan 0, 1 and 2 I cannot get the fan to move.
I tested continuity per the image below from this thread https://forum.duet3d.com/topic/3652/shorted-hotend-fan-no-fan-work-anymore/3
and I have 0 ohms.
anything else I should look for?
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forgot to add using 24 V fans. Also I measure across fan 0 V-fan and fan0- my multimeter reads 20V
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Did you check the fuses? Last time I did an oooops, it just took out the fuse ....
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@jens55 checked and replaced even just to be sure
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@jaurand said in shorted hot end cooling fan.:
accidentally shorted the hot end cooling fan. Always on fans work fine, but fan 0, 1 and 2 I cannot get the fan to move.
I tested continuity per the image below from this thread https://forum.duet3d.com/topic/3652/shorted-hotend-fan-no-fan-work-anymore/3
and I have 0 ohms.
That test only applies to older Duets, before we added the fan fuse,
anything else I should look for?
Test for continuity between the centre pin of the V_FAN jumper block and the V_FAN pins of the 3 non-working fan outputs.
If the hot end fan shorted out, it will probably have fan mosfet that was driving that fan. But I would not expect the other 2 fan mosfets to be affected.
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@dc42 tested continuity between the 3 non working fan outputs from the pins as well as from the back of the board and I come up with 0.2 Ohms.
I tried moving the jumper pin to 5V and putting a new 5v fan on but no luck there either.
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It sounds like failed fan mosfets then.
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where are they at on the board. happy to replace them as long as i know what i am looking at
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