Mathew, Depending on the meter that you have you should get a reading of between 400 and 700. My Fluke 77 shows 453 on most Astron's that I have serviced. If you have a short between any pin and case or between pins the transistor is defective and must be replaced.
Also check the resistors in the output stage, as you will probably find one or more open. If the transistor blew to the base it probable took out the 723 as well. I most if not all cases we change out all the transistors and the 723. Only in a couple of cases did we find other damage that required more parts. Good Luck, Charles Miller ----- Original Message ----- From: "w9mwq" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, January 25, 2005 4:02 AM Subject: [Repeater-Builder] Transistor Checking > > > 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. > > Mathew > > > > > > > > > > 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/
