Thu Jun 29 2023

fan runs

Fan starts running soon as you plug AC power to it. Doesn't have to be turned on. What causes this?

Equipment: Nellcor - N-600

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Thu Jun 29 2023Reply from Chris S
Chris S

My schematic reading skills are a little rusty, but it seems power for the fan is sourced directly from Main_dc meaning it will run whenever there is dc power.

Page 163.

Official MedWrench Guru
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Thu Jun 29 2023Reply from T-Lobato

There is a chip called U1 that controls the fan.  That may be the bug.  I would take some voltage readings before I replaced it though...if it's replaceable.

TJ Lobato | MedWrench Guru
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