8580 Power Connector Pinout
This is pretty simple :-)
>(BTW, one thing worries me about my 8580's power supply
- it crackles. When the machine is switched _off_ there is a quiet crackling
sound from the back of the power supply, it sounds like it could
be in tune with the 50Hz mains frequency. When I first heard it I
nearly took the
Half the PSUs on the Mod. 80 failed with broken power switches. The red ones more often than the white ones. The same switch has been used in IBM 327x Terminals (and 525x ones) and is known for high failure rates. It was available as spare part.
Are you sure the noise comes from the rear ? The "switch
cover" in the front acts like a "echo chamber" and reflects the crackling
from the switch to the rear.
Something I forgot: One of my 95s made "crackling noises"
too. The clue: replace the power cord. The one I used seemed to have too
loose contacts. After I used a different one the crackling went away ...