Author Topic: DP832 - Fan Replacement 2018  (Read 3741 times)

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Offline Gandalf_Sr

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Re: DP832 - Fan Replacement 2018
« Reply #25 on: April 02, 2020, 11:51:23 pm »
Go back and read my first post.  There's a picture of the PCB with a large resistor that I drew a red rectangle around in one of the pictures.  That resistor carries the current drawn by the fan and the voltage across that resistor is what the DP832 uses to detect whether the fan is running or not.  You need about 1.2V across it when the fan is running, achieve that and the DP832 will not have issues with failed fan messages.  Its really simple, Ohms law.
If at first you don't succeed, get a bigger hammer
 

Offline Gandalf_Sr

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Re: DP832 - Fan Replacement 2018
« Reply #26 on: May 16, 2020, 12:29:41 am »
I got a second DP832 a week ago and ordered a new fan, same one as before. I took the lid off today and the PCB is a new one and there is no big resistor!  I took pictures and will add soon but what did I do?

I measured the current draw of the old fan at 120 mA, the new one is only 60 mA so I added a 200 \$\Omega\$ 2W resistor (4 x 820 \$\Omega\$ 1/4 W resistors in parallel) and put that across the fan connection.  My calculations say that it only draws 0.7W so 2W seems reasnable.

It runs fine. I loaded up the supply and the fan cranked up to cope.
If at first you don't succeed, get a bigger hammer
 


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