> > This machine acts oddly. After powering it off, you usually can't power it > back on again for about 30 seconds or so, it just seems to ignore the power > switch. Similarly, if it has been switched off at the front power switch, it > will switch itself on after maybe a minute of two of being switched off. In > all other respects the machine seems fine. I have not opened up the PSU at > all, just wondering if anyone has ever seen this and might know what the > problem is? >
Not quite the same thing but I have noticed that many DEC power supplies will sulk for a while if their overload trip is triggered. Switching them off and on again straight away is not enough to reset them even though the overload is cleared. The H7821 seems to need to be switched off for around 16 seconds minimum before it will contemplate coming to life again. I have come across similar behaviour with the power supplies in various other small VAX and Alpha machines but I have not measured the exact time period involved in any other cases. Regards, Peter Coghlan.
