husted@iccgcc.decnet.ab.com (11/28/90)
It looks like my A2000 power supply died. ;-(
SYSTEM:
A2000 approx 2.5 years old with 3meg RAM,8088 bridge board hard disk
Problem:
I was using it for > 6 hours and all the sudden, it looked like it
turned itself off. The monitor was still on but the power LED and
fan and computer was off. I turned it off and let it set for 5 mins.
and turned it back on and it went quit a ways through the powerup
sequence but then turned itself off again. I turned it off, waited a
day and tried again it started to powerup but turned itself off again
during the powerup sequence.
QUESTION:
Is this a failure mode that anyone is familiar with?
I took the supply out and did some probing around with a volt meter
(I have no schematics) I can see where the 115 volts AC is converted
to 250 volts AC then converted to high voltage DC and switched run
through a multi tap transformer. I don't know what all the voltages
should be (without load) I did measure 9.2 volts at the fan (12 volt
fan) but the fan doesn't budge.
Anyway, any help would be appreciated. I would like to avoid spending
the $150 for a new supply.hinker@acl.lanl.gov (Paul J. Hinker) (11/30/90)
> It looks like my A2000 power supply died. ;-( >SYSTEM: > A2000 approx 2.5 years old with 3meg RAM,8088 bridge board hard disk >Problem: > I was using it for > 6 hours and all the sudden, it looked like it > turned itself off. The monitor was still on but the power LED and > fan and computer was off. I turned it off and let it set for 5 mins. > and turned it back on and it went quit a ways through the powerup > sequence but then turned itself off again. I turned it off, waited a > day and tried again it started to powerup but turned itself off again > during the powerup sequence. >QUESTION: > Is this a failure mode that anyone is familiar with? --Fear not, it may not be as bad as it seems. I was having similar problems with my A2000 and had resigned myself to buy a new power supply but posted here with a discription of the problem. That post saved me $200. From what I understand, the fan in the Amiga 2000 is prone to failure. When this happens, the power supply goes over voltage and shuts itself down. Change the fan ... Don't believe dealers who want to change your power supply ... This is a common problem. --Hope this helps, Paul -- 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
husted@iccgcc.decnet.ab.com (12/06/90)
In article <2166.2752a2fc@iccgcc.decnet.ab.com>, husted@iccgcc.decnet.ab.com writes: > It looks like my A2000 power supply died. ;-( > > SYSTEM: > A2000 approx 2.5 years old with 3meg RAM,8088 bridge board hard disk > > Problem: > I was using it for > 6 hours and all the sudden, it looked like it > turned itself off. The monitor was still on but the power LED and > fan and computer was off. I turned it off and let it set for 5 mins. > and turned it back on and it went quit a ways through the powerup > sequence but then turned itself off again. I turned it off, waited a > day and tried again it started to powerup but turned itself off again > during the powerup sequence. > > QUESTION: > Is this a failure mode that anyone is familiar with? > I received numerous responses to this post and would like to thank everyone of you who replied. It saved me lots of bucks. Apparently this is a common problem but I have missed seeing it before and maybe others have. The problem turned out to be my cooling fan. The power supply shuts down if the cooling fan is not drawing current. I opened up my fan and found the problem was a fine wire for one of the coils was being rubbed by the fan rotor and eventually wore through. It did not look like it would be reasonable to fix the problem (it being a fine wire and in a bad spot) so I have ordered a new one (fan) from Digi-Key part #P9984-ND. Thanks again for the help!