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   comp.sys.ibm.ps2.hardware      Discussing IBM PS/2 hardware      42,985 messages   

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   Message 41,183 of 42,985   
   Pertti Helander to All   
   Re: My IBM PS/2 8595-AKD missing power.   
   10 Jan 23 05:41:15   
   
   From: pertti.helander@pp.nic.fi   
      
   tiistai 10. tammikuuta 2023 klo 14.13.12 UTC+2 slavo...@gmail.com kirjoitti:   
   > The click you heard might have been a relay. Did the PSU make a similar   
   > sound when you powered it on?   
   > This may be the same problem you were having before when the machine   
   > shut down randomly. Disconnect the PSU, give it a minute and try   
   > restarting it using the same method as before. If it powers on, just   
   > leave it running, not touching anything and see if it shuts down on its   
   > own again.   
   > Even a dead short on one of the voltage rails (touching DMM probes or   
   > whatever) should not cause the the internal fuse to blow. An   
   > over-current protection (OCP) should kick in and shut down the unit.   
    Thomas was right, it´s a relay that turned PSU off, not a fuse. I put power   
   cord on, closed pins 1-2 and PSU cooler starts. I measured   
   pins 5-3, was +5 V, pins 5-7 was -12 V, pins 5-16 was +5 V and when I measured   
   pins 5-4 I got +12 V but power went off. Like Thomas I guess that at the first   
   time after 10 years when I booted my 8595 it starts displaying few checkpoints   
   and went power    
   off. Any guesses what caused a relay to go off?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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