[time-nuts] 53132 replacement fan

Bob Camp kb8tq at n1k.org
Mon Nov 21 17:21:44 EST 2016


Hi

The bigger issue when you replace the fan:

Do the best job you possibly can cleaning out the power supply. Also check the soldering and the rest
of the workmanship on the power supply pc board. It’s the weak link in the counter. You don’t have to
give it much of a look to figure out HP bought the whole thing supply as a unit from “somebody else”. 
Whoever that vendor was … probably the low bidder.

Bob

> On Nov 21, 2016, at 4:45 PM, Tom Knox <actast at hotmail.com> wrote:
> 
> Hi All;
> 
> Mouser has more then 200 of the EFB0412MD OEM fans in stock. 10.93 in singles.
> 
> I have so many fans running in my lab I do not worry much about a little more noise. But a noisy fan is a major concern because of overheating if the fan fails, and although I usually go for an OEM parts in some cases with product that generate a lot of heat (especially product where I have seen heat contribute to failure) I will go with a more powerful fan.
> 
> Cheers;
> 
> Thomas Knox
> 1-303-554-0307
> tom.knox at nist.gov and actast at hotmail.com
> 
> 
> ________________________________
> From: time-nuts <time-nuts-bounces at febo.com> on behalf of John Ackermann N8UR <jra at febo.com>
> Sent: Monday, November 21, 2016 11:37 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] 53132 replacement fan
> 
> Thanks, all for the tips.  Glad to know it's a standard size so there's
> plenty of choice.
> 
> John
> ----
> 
> On 11/21/2016 12:57 PM, jimlux wrote:
>> On 11/21/16 6:39 AM, Charles Steinmetz wrote:
>>> Tom wrote:
>>> 
>>>> EFB0412MD
>>>> Airflow 7.17 CFM
>>>> 6300 RPM
>>>> Noise 24 dBA
>>>> 
>>>> FBK04F12U
>>>> Same exact form factor.
>>>> Air Flow 9.2 CFM
>>>> 9500 RPM
>>>> Noise 42 dB(A)
>>> 
>>> Note the 18dB greater noise (that's a HUGE difference).  Even with bad
>>> bearings in the original fan, it is probably considerably quieter (by
>>> 10dB or more) than the proposed replacement.  On the other hand, the
>>> replacement moves 28% more air, which may be a good thing.
>>> 
>> 
>> That's a 40mm fan, which is a standard size, I'll bet you can find a
>> slower turning/quieter fan.
>> 
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