Unfortunately this is not the case. thanks though. On Aug 11, 2009, at 10:03 PM, Bil Herd wrote: > Possible the meter is in AC mode? > > -----Original Message----- > From: owner-cbm-hackers@ling.gu.se [mailto:owner-cbm-hackers@ling.gu.se > ] On Behalf Of Philip Lord > Sent: Tuesday, August 11, 2009 8:31 AM > To: cbm-hackers@ling.gu.se > 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 list Message was sent through the cbm-hackers mailing listReceived on 2009-08-11 16:17:52
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