Possible the meter is in AC mode? -----Original Message----- From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Philip Lord Sent: Tuesday, August 11, 2009 8:31 AM To: firstname.lastname@example.org Subject: Re: Dead PET 2001 Update: With the red leads detached from the capacitor I tested the voltages again this evening. Where as before I was getting over 8VDC, now I'm only getting 0.5VDC on the cathode side of the diodes...very strange. I wish I knew what was going on. Maybe it's time to start by removing the diodes and testing them. Phil On Aug 10, 2009, at 3:14 PM, Philip Lord wrote: > Thanks William, > I did as you described. > I removed the red wires from the capacitor and re-measured the > voltages on either side of the two diodes. > As before I get just over 8VAC on the anode side, but now I get > just over 8VDC on the cathode side. > > I also tested the large capacitor using the ohm meter on my digital > multimeter. It starts at Zero ohms and slowly rises. > > I apologies for my lack of electronic knowledge, and once again ask > what I should try next? Hopefully we are narrowing down the problem. > > Cheers again > Phil > > > > On Aug 10, 2009, at 1:07 PM, William Levak wrote: > >> On Sun, 9 Aug 2009, Philip Lord wrote: >> >>> oops...Please excuse my bad typing...what I mean to say was: >>> >>> Yes, I admit I was checking the voltage on the inside of the >>> diodes with my multimeter (digital) set to AC. I just rechecked >>> with it set to DC and the reading is still in the millivolt range. >>> If the diodes are indeed the culprit, I find it strange that both >>> diodes would be open? >>> As for the J8 connecter, it basically looks new, no dirt, or >>> burning at all. >> >> You said the fuse blew several times. That would be enough to blow >> the diodes. Disconnect the red wires from the capacitor, and check >> the voltages again. Also check the capacitor for shorts. If you >> don't have a capacitor tester, you can use an ohm meter. The >> resistance should start at zero and build up. >> >> Message was sent through the cbm-hackers mailing list > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing list -- This message has been scanned for viruses and dangerous content by IDSi's MailScanner. Message was sent through the cbm-hackers mailing listReceived on 2009-08-11 15:19:15
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