Ok, that is what I thought, then I was checking them right. But I let the blue stuff out a bit ago. I have to astron power supplies, one pops the fuse then I turn it on, the turns on, but no voltage out. Took the 723A chip out of the one and put it in the other and blue smoke rolled. Killed a resistor. The one that powers up does charge the caps, I assume the 723A is bad, but wonder if something else may be bad before it. The resistor that died is connected to a transitor on the case.
Mathew -----Original Message----- From: Kevin Custer [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 25, 2005 3:26 AM To: [email protected] Subject: Re: [Repeater-Builder] Transistor Checking w9mwq wrote: >Just need a short memory replacement here please. I'm working on an >Astron 35 amp power supply, hope to get it going again. I'm >checking the transistors in the unit, and not sure if I remember >correctly. On my vom, in the diode checking position, I should have >a dead short from case to one pin, and nothing from case to the >other pin, but should there be a reading from pin to pin. These are >on the 2N3771 transistors. Thanks. > You should not read a short anywhere. If you do, the transistor is shorted. You should have diode action from pin to pin, and one of the pins to the case; and the other pin to the case shouldn't read either way. Kevin Custer Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
