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Replacing the noisy fan in the PEB

modification hardware PEB

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#1 kl99 OFFLINE  

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Posted Tue Jan 6, 2015 2:22 PM

Hi,

I am currently trying to perform the FAN replacement within the PEB.

It is the push button PEB.

 

So far I have managed to disassemble everything and removed the original 110v fan.

http://www.mainbyte....ox_project.html

 

Attached File  IMG_2040.JPG   2.35MB   3 downloads

 

Attached File  IMG_2041.JPG   2.65MB   3 downloads

 

But what to do with the wires that went into that fan?

How to best isolate those 110V wires?

 

Attached File  IMG_2043.JPG   2.34MB   3 downloads

 

And instead of soldering the power connector of the new 12V fan to the internal power supply I would prefer to connect it to the 12V MOLEX connector that goes to the disk drives. I have an adapter like this:

adapter-molex-4pin-f-molex-4pin-m-fan-2p

 

Thanks for any replies.

I hope to finish this before going to sleep...



#2 kl99 OFFLINE  

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Posted Tue Jan 6, 2015 2:25 PM

Here you can see how the Push-Button PEB isolates the wires of the unused voltages:

 

Front View:

Attached File  IMG_2045.JPG   2.13MB   3 downloads

 

Top View:

Attached File  IMG_2046.JPG   2.33MB   3 downloads

 

Below Fan View (don't know if helpful):

Attached File  IMG_2047.JPG   1.69MB   3 downloads

 



#3 --- Ω --- OFFLINE  

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Posted Tue Jan 6, 2015 3:09 PM

You could easily avoid the extra cables if you don't mind soldering two little connections.

The photo below (ripped off of the Mainbyte site) shows where you connect the 12v leads.

 

peb_17.jpg

 

As for the left over AC leads you could terminate them with electrical tape... or add a power tap for a low powered item you want to come on at the same time you turn on the P-Box.



#4 kl99 OFFLINE  

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Posted Wed Jan 7, 2015 8:26 AM

This is how I have isolated the wires that did go to the original 110V fan, the blue isolation tape was done 3 times just to be sure.

 

Attached File  IMG_2062.JPG   2.22MB   4 downloads

 

Here is the fan. I didn't reuse the nuts from the original fan because my smallest wrench was size 6 and that was slightly too wide. Will try to get better tools next time.

Maybe its an interesting note that the "screws" that hold the nuts are fixed on the PEB, you can not replace them by other stuff (plastic ones or whatever comes with your fan).

 

Attached File  IMG_2061.JPG   2.19MB   3 downloads

 

Attached File  IMG_2055.JPG   1.98MB   3 downloads

 

My fan came with a 3 pin Molex connector. Instead of soldering it directly to the internal power supply, I chose to use one of the many adapters that were lying around in my appartment from PC tooling.

The adapter is shown above. It is 2 pin only, but relax the 3rd pin is only sending optional feedback data like RPM to the mainboard. The 3rd pin is never used to control the speed of the fan.

You can see nicely how I wired the fan power connector to the big molex connector that goes to the disk drive(s).

 

Attached File  IMG_2057.JPG   1.85MB   1 downloads

 

The project is almost done, the PEB is closed already and the new fan was running fine on first tests, although I can barely hear it.

This new fan runs below 10db.

 

Thx to everyone who supported me, kl99



#5 Asmusr ONLINE  

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Posted Thu Jan 8, 2015 3:07 PM

Is it a standard 80 mm fan?



#6 kl99 OFFLINE  

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Posted Fri Jan 9, 2015 2:07 AM

standard 8cm fan, 12V.

I chose this model because it was on stock in the conrad shop I went:

http://www.blacknois...0x25mm.php#tab5



#7 Asmusr ONLINE  

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Posted Fri Jan 9, 2015 1:05 PM

standard 8cm fan, 12V.

I chose this model because it was on stock in the conrad shop I went:

http://www.blacknois...0x25mm.php#tab5

 

Thank you, I have also replaced my fan now. It really makes a big difference.



#8 conmee OFFLINE  

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Posted Mon Feb 2, 2015 3:55 AM

I followed the same process as kl99 and the fan replacement I'm using draws power via a similar adapter to the one kl99 posted (it is connected in line between the floppy power and floppy drive). Didn't recall just how loud the original PEB was until I set up my system a few weeks ago. Using an iPhone app (I don't vouche for it's accuracy), the noise level in my home office is ~38db with all electronics turned off. With the original PEB running the noise level rose to ~84db. After changing the fan, the noise level with the PEB running is ~42db with the new brushless fan. Makes a huge difference, and now the dog no longer runs off when I fire up the TI...  :thumbsup:

 

Thanks to the Mainbyte site, kl99, and the helpful community here as this is definitely a worthwhile upgrade.



#9 schmitzi OFFLINE  

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Posted Wed Feb 11, 2015 12:35 PM

Hi,

here are some pics from different mods I did

Attached Files



#10 retroclouds OFFLINE  

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Posted Sun Dec 18, 2016 2:20 PM

ok, I have 2 PEB's where I want to change the fans.

Incredibly how loud these things are. What was TI thinking? Might have been ok for the server room, but surely not to have one on your desk.
Both PEB's are in the toggle version, not the push button version (does that matter?)

How much time does this take? Anything else that would make sense doing while the PEB is dismantled?

#11 Sinphaltimus OFFLINE  

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Posted Sun Dec 18, 2016 3:47 PM

ok, I have 2 PEB's where I want to change the fans.

Incredibly how loud these things are. What was TI thinking? Might have been ok for the server room, but surely not to have one on your desk.
Both PEB's are in the toggle version, not the push button version (does that matter?)

How much time does this take? Anything else that would make sense doing while the PEB is dismantled?


It takes 500 hours to get to the fan.

2 minutes to replace it and 600 hours to put everything back.

4962 screws.



#12 jstimson OFFLINE  

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Posted Sun Dec 18, 2016 8:10 PM

I may be odd, but off all the mods I could do to my TI setup, this would be last on my list.  I grew up with the loud fan as background noise to much of my childhood.  I find it oddly comforting now and think I would actually miss it if it went away.



#13 OLD CS1 OFFLINE  

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Posted Sun Dec 18, 2016 9:08 PM

At my age I just want quiet.



#14 InsaneMultitasker OFFLINE  

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Posted Sun Dec 18, 2016 11:29 PM

There is one "advantage" to the loud/audible fan:  it helps to remind you the PEB is turned on.  

 

Back when the quiet fan replacement was 'all the rage', there was an uptick in peripheral card repairs, often because someone forgot to turn off the now-silent PEB before removing or inserting a card.  A visible warning aid, such as one or more top-down visible LEDs, is a good idea to round out the fan replacement.


Edited by InsaneMultitasker, Sun Dec 18, 2016 11:30 PM.


#15 Sinphaltimus OFFLINE  

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Posted Mon Dec 19, 2016 4:50 AM

There is one "advantage" to the loud/audible fan:  it helps to remind you the PEB is turned on.  
 
Back when the quiet fan replacement was 'all the rage', there was an uptick in peripheral card repairs, often because someone forgot to turn off the now-silent PEB before removing or inserting a card.  A visible warning aid, such as one or more top-down visible LEDs, is a good idea to round out the fan replacement.


Or a kill switch attached to the cover.

#16 Vorticon ONLINE  

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Posted Mon Dec 19, 2016 5:01 AM

There is one "advantage" to the loud/audible fan:  it helps to remind you the PEB is turned on.  

 

Back when the quiet fan replacement was 'all the rage', there was an uptick in peripheral card repairs, often because someone forgot to turn off the now-silent PEB before removing or inserting a card.  A visible warning aid, such as one or more top-down visible LEDs, is a good idea to round out the fan replacement.

 

I second that. With my ATX PSU replacement in the PEB, it's really hard for me to tell if the PEB is on at all, and I frequently have to look at the switch position to verify...



#17 schmitzi OFFLINE  

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Posted Mon Feb 13, 2017 5:01 PM

yes, a silent fan is very nice :)

 

 

Attached File  TI-Potpourri-PEBs.jpg   210.57KB   2 downloads

 

 

Attached File  TI-Potpourri-Pebs2.jpg   176.74KB   2 downloads



#18 Casey ONLINE  

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Posted Mon Feb 13, 2017 7:56 PM

ok,Incredibly how loud these things are. What was TI thinking? Might have been ok for the server room, but surely not to have one on your desk.
 

You must have never been around an actual IBM PC of the same vintage then.  The public library I worked at for my first job had a genuine IBM PC XT as the main circulation desk computer and it sounded like a jet engine starting up when you turned it on.  It was later replaced with a much quieter IBM PS/2 - but I suspect the loudness of the TI fan is just a product of the time it was made.  



#19 --- Ω --- OFFLINE  

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Posted Mon Feb 13, 2017 9:29 PM

I made a blog entry when I replaced the fan with a 'whisper quiet' version in my backup Box back in May of 2015 and have not used it or turned it on since.  I really should sell it, but I don't want to go through the hassle of shipping it.  






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