hinker@acl.lanl.gov (Paul J. Hinker) (10/24/90)
I think I have a problem with the power supply in my Amiga 2000. About a month ago, I added a 2-Meg card (complete with memory) to my machine. Since then there's been a high pitched whine coming from the back of the machine. I thought that it was just my fan finally giving up the ghost but now I'm not too sure. I was crunching along on a ray-trace a couple of nights ago when all of a sudden the machine just went dead. Now when I turn it on, the power light comes on and the disk drives start to spin up and then it shuts off. Like a breaker going out. The lights only stay on maybe a second and then nothing. Is this a power supply problem or something more insidious? The fuse in the power supply is good and there don't seem to be any shorts that I can detect. Any help would be greatly appreciated, -- Paul Hinker hinker@acl.lanl.gov /// If it works, it's not state-of-the-art MS B287 505-665-4531 /// --Hansen's Law Los Alamos National Labs ACL \\\/// All our stuff is broke Los Alamos, NM 87545 \XX/ --Forslund's Corollary
bj@cbmvax.commodore.com (Brian Jackson) (10/25/90)
In article <HINKER.90Oct24083326@grizzly.acl.lanl.gov> hinker@acl.lanl.gov writes: > > I think I have a problem with the power supply in my Amiga 2000. About a [...] > I was crunching along on a ray-trace a couple of nights ago when all of >a sudden the machine just went dead. Now when I turn it on, the power light >comes on and the disk drives start to spin up and then it shuts off. Like >a breaker going out. The lights only stay on maybe a second and then nothing. > > Is this a power supply problem or something more insidious? The fuse in >the power supply is good and there don't seem to be any shorts that I can >detect. I had a very similar problem with my 2500 and it proved to be the switch on the power supply. It happens :) >Paul Hinker hinker@acl.lanl.gov bj ----------------------------------------------------------------------- | Brian Jackson Software Engineer, Commodore-Amiga Inc GEnie: B.J. | | bj@cbmvax.cbm.commodore.com or ...{uunet|rutgers}!cbmvax!bj | | "It's a dog-eat-dog world and I'm wearing Milk-Bone underwear." | -----------------------------------------------------------------------
peck@ral.rpi.edu (Joseph Peck) (10/25/90)
In article <HINKER.90Oct24083326@grizzly.acl.lanl.gov> hinker@acl.lanl.gov writes: > I was crunching along on a ray-trace a couple of nights ago when all of >a sudden the machine just went dead. Now when I turn it on, the power light >comes on and the disk drives start to spin up and then it shuts off. Like >a breaker going out. The lights only stay on maybe a second and then nothing. > > Is this a power supply problem or something more insidious? The fuse in >the power supply is good and there don't seem to be any shorts that I can >detect. This is almost a me too post.... My roommates 2000 has the same problem. He has an 8UP! board with 4megs, and an xt bridgeboard. His made a buzzing noise for a while, but I could almost swear that it actually was his fan. Now when he turns it on, the power light comes on for about a second, and then shuts off. I took out the two boards, but to no avail. So, if anyone has any ideas, there are at least two people interested in them. Any help would be appreciated. > > Any help would be greatly appreciated, > >-- >Paul Hinker hinker@acl.lanl.gov /// If it works, it's not state-of-the-art >MS B287 505-665-4531 /// --Hansen's Law >Los Alamos National Labs ACL \\\/// All our stuff is broke >Los Alamos, NM 87545 \XX/ --Forslund's Corollary Joe Peck peck@ral.rpi.edu It's hard to install and test a 14Mhz hack when you only get one second to test it..... :(
ath@lcs.mit.edu (Andrew Heybey) (10/25/90)
In article <%=5%0A$@rpi.edu> peck@ral.rpi.edu (Joseph Peck) writes:
This is almost a me too post.... My roommates 2000 has the same problem.
He has an 8UP! board with 4megs, and an xt bridgeboard. His made a buzzing
noise for a while, but I could almost swear that it actually was his fan.
Now when he turns it on, the power light comes on for about a second,
and then shuts off. I took out the two boards, but to no avail.
So, if anyone has any ideas, there are at least two people interested
in them. Any help would be appreciated.
It may very well be the fan. If the fan doesn't start (and thus draw
current from the +12V supply), the supply goes overvoltage and shuts
itself down. Or so I was told when a similar problem happened to me.
This *seems* to be confirmed by the behavior of my A2000. My fan will
not reliably start itself. If I just turn the computer on, I get the
one second burst of power, followed by nothing. If I turn the
computer on while spinning the fan (so that it will start--it runs
fine after that), everything works fine.
Try replacing your fan & seeing what happens. I haven't replaced
mine, yet. My wife thinks that I'm nuts for living with a computer
that I have to turn on by sticking a toothpick in the back while
flipping the switch.
--
Andrew Heybey, ath@ptt.lcs.mit.edu, uunet!ptt.lcs.mit.edu!athjms@tardis.Tymnet.COM (Joe Smith) (10/26/90)
In article <HINKER.90Oct24083326@grizzly.acl.lanl.gov> hinker@acl.lanl.gov writes: >a sudden the machine just went dead. Now when I turn it on, the power light >comes on and the disk drives start to spin up and then it shuts off. Like >a breaker going out. The lights only stay on maybe a second and then nothing. That is the exact description of a burned out fan. I know, I had to replace the fan on my A2000. If the power supply detects that the fan is not drawing any current, it shuts down. Watch the fan as you turn on the power. If it does not rev up to full speed in that first half second, you have located your problem. (You can verify this by unplugging the fan from the power supply and checking the fan's continuity with an ohm meter.) -- Joe Smith (408)922-6220 | SMTP: jms@tardis.tymnet.com or jms@gemini.tymnet.com BT Tymnet Tech Services | UUCP: ...!{ames,pyramid}!oliveb!tymix!tardis!jms PO Box 49019, MS-C41 | BIX: smithjoe | 12 PDP-10s still running! "POPJ P," San Jose, CA 95161-9019 | humorous dislaimer: "My Amiga 3000 speaks for me."
LDSHANER@MTUS5.BITNET (Leon D. Shaner) (10/30/90)
I had a similar problem, but with no noises... I just came in one day and the machine wasn't powered down (I run a BBS, so it is normally up 24 Hours) I thought some moron had shut it off... Anyway, the switch was on and so I didn't know what to think... I turned it off and back and it came on... After about a minute it just shut down... I had a window fan going when I first tried it, so I didn't notice that the fan in the power supply was not working... I tested the voltage at the fan's contact leads and it was roughly 12 volts as required... Turns out, the fan was bad and the PS new it, so it would shut down... I went to RadioShack and bought one of their $15.00 fans that have exactly the same power ratings, and installed it... The thing was fatter, so I had to put the screws in differently than the original... Right now, it is making the most horrible noise - I'm going to have to replace it again, soon, so I'm going to try to find a source for the original fan, since it lasted over 2.5 years... Good luck...