Products > Test Equipment

DP832 - Fan Replacement 2018

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Gandalf_Sr:
After working with my new DP832 this week, I decided that the fan was sooo noisy that it had to go.  I googled and found this blog/website describing how to switch the noisy Sunon Maglev ME80251v1-000C-A99 fan for a Noctua NF-R8 redux 1800; I got the fan and a 2W 27 Ohm resistor and did the change yesterday.  A few comments and then some pictures...

It's a pain to change as you have to take the PSU apart - take lots of pictures showing where all the different plugs go before unplugging everything.

The link I posted above says that the old resistor that measures the fan current (R44) is 15 \$\Omega\$ but mine was only 7.5 \$\Omega\$ which worried me a bit but he also lists the current drawn by his Noctua as 110 mA - the one I got was only 60 mA and still claims 53.3 m3/Hr.  My calcs were that 7.5 \$\Omega\$ x 0.15 A = 1.125 V (old) and 27 \$\Omega\$ x 0.06 A = 1.62 V (new) so I would have been better with a 19  \$\Omega\$ resistor but I figured that the OpAmp that was checking the voltage probably didn't care about 1.62 vs 1.125 volts so I stuck in my 27 \$\Omega\$ resistor. 

My new fan had 4 wires so I cut the plug off the old fan and connected the new fan to that 2 pin connector (black is 0V and yellow is +12V).

I put it back together and powered up, it seems to work perfectly - no failed fan messages when I turn the outputs on - and the fan is almost inaudible now - it does the short burst of full speed on start up and I can tell that it has quite some capability if it needs to move air.  I live in Michigan so the DP832 is likely going to never see more than 90 degrees F ambient and only 72 indoors.

Pictures:
Old Fan
New Fan fitted
R44 (in red box)
System Info showing no-load temp (get that detailed view by viewing the ordinary system info and then pressing buttons under screen (numbers from L to R) 1 - 3 - 2)

taydin:
Thanks for this info, my DP832A is also starting to get on my nerves with its constant fan noise. Might change mine, too, if I can find this nice fan, that is ...

Gandalf_Sr:
I bought my fan from Amazon https://www.amazon.com/gp/product/B00KF7MVI2/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

Just out of curiosity, what is your fan temperature with no load? (follow 1-3-2 steps above) I didn't record mine before I did the modification.

PTR_1275:
Did you do anything to get the bottom half of that screen showing? (With the temperature)

My dp832 shows the first 3 lines, but it’s fw 00.01.14

JDubU:
I can answer that:

Press Utility > SysInfo > M1, M3, M2
where "M1" is is the left-most button on the bottom of the display.

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