power supply problem

From: dkelvey at hotmail.com To: cctalk at classiccmp.org Subject: RE: Altair 680 power supply... Date: Sun, 17 Jan 2010 08:46:51 -0800 Hi I just came on an unusual problem. I'm fixing a power supply with +12 and +5 outs. It uses 2 723 regulators. The one on the +12 was blown. I bought another 723 regulator and it didn't seem to be working. I checked the voltages and noticed that the 5 volt one that is working fine, has a Vref of about 3 volts while the new one has a Vref of 7 volts. Looking at the specs, it is suppose to be 7 Volts. Looking at the resistors on the board, the board expects 3 volts. Has anyone seen these with different reference voltages before? I'll have to change the feedback resistors ( not a big deal ) but this is a strange one. Dwight _________________________________________________________________ Hotmail: Trusted email with Microsoft?s powerful SPAM protection. http://clk.atdmt.com/GBL/go/196390706/direct/01/