| my fan isn't pop-riveted, just held in place by 4 screws. I removed
the grill to see if that made any difference - nope. I like your
idea though, maybe some felt padding between the fan and the metal
case might help. I suspect it is simply a noisy fan. The XT in
my office also has a noisy fan - is that the norm for the ibmpc
world?
-dave
|
|
Amiga 2000 Stealth Fan Instructions
Tired of listening to that Jet Engine Turbine fan on your Amiga 2000?
Well, here's a solution I came up with that cuts the fan noise down by
at least half. Over the course of the last 6 months, the noise of my
Amiga 2000 fan slowly increased as the bearings for the fan started to
make more and more noise. Since my warranty was out, I decided to go
ahead and pull the power supply and check out the fan. To my surprise,
when the fan was separated from the power supply and held by hand, it was
almost whisper quiet, except for the noise the bad bearings generated.
But when mounted in the power supply, the noise was terrible. Drawing
on my experience in the Submarine Navy, I realized that it was a simple
problem of sound isolation. The fan had been pop-riveted to the
aluminum case for the power supply. This direct metal to metal contact
allowed the noise vibrations to transfer from the fan to the power
supply, and from there to the rest of the Amiga case, amplifying the
sound generated by the fan.
The solution? Well, I went to the local hardware store and bought
four 1/8" x 1" round headed bolts with nuts and lock washers and four
round rubber grommets with a 1/16" slot for the power supply casing and
a 1/8" hole for the screws. These parts should only cost a couple dollars.
Now, installation. First turn the 2000 off and unplug the power
cord from the rear. Next, remove the 5 phillips head screws holding the
cover on, and remove the cover. There is one screw in the top middle
of the back, and 2 screws on the bottom of the cover on each side.
Next, remove the 2 screws on the back of the 2000 for the power supply,
one is located at the top of the inside edge of the fan, the other is
at the top, just above the power cord connection. Now remove the 2
screws that mount the power supply to the metal mounting bracket for
the power supply and drives. These screws are at the front of the
the the supply next to the protective cage. Now, unplug the cords
coming from the power supply to the motherboard and disk drives.
You should be able to remove the power supply now. Ok, now to remove
the fan, use a 1/8" or 5/32" drill bit and drill out the rivets
connecting the fan to the power supply. Next you need to drill out the
fan mounting holes on the power eupply to accommodate the rubber grommets.
The grommets I used required a 5/16" hole. Now install the grommets,
and mount the fan using the 4 bolts, lock washers, and screws. I
found it was easiest to install the bolt at the bottom right corner
of the fan first. (Looking from the rear of the power supply)
Tighten the screws until snug, but don't overtighten.
One last item, you should trim any of the rubber grommet sticking out
on the side of the fan cover plate so that the power supply can fit
snugly against the rear of the 2000. That's it! Now just re-install
the power supply and the 2000's cover.
Glen Nielsel
CIS 75115,444
BIX gnielsel
|