At 05:49 AM 7/22/2008, David Ackrill wrote... >On plugging in a lead there was a slight 'buzz' and, on checking the >outputs, no DC volts. Checking the lead showed no AC volts. So, I >opened the plug and checked the fuse, a 3 Amp type - too big for the >unit output really, but shouldn't have blown... > >Changing the fuse for a 1 amp type, and plugging back in showed no >output voltage again. Checked the business end of the lead and >there's >AC volts still there. I'm guessing, from experience of these PSUs in >the past, that there's a fuse inside the unit which has also >blown. If >so, I guess I have a faulty PSU?
Most switching supplies require a minimum load to operate correctly. If the output is just open, and you don't see any voltage, it doesn't necessarily indicate a problem. I wouldn't use it with the Thunderbolt until you get the issue worked out, though - you don't want to blow it up if there's been a failure in the power supply's protective circuits. According to a previous list message, a running Tbolt takes about [EMAIL PROTECTED], [EMAIL PROTECTED], and [EMAIL PROTECTED] So maybe a 75 Ohm, 2 W resistor across the +12V and a 20 Ohm, 2W resistor across the +5. If those are covered, the -12 can probably be left open without issue. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
