Update: I have replaced nearly all the power circuit components: 4 x 7805 voltage regulators 3 x 1.0uf tant Caps (C11 thu C13) 4x 16v 47uf Caps (Actually replaced with 25v 47uf) 1 x CR3 Diode (replaced with 3004) ...and nothing has changed. I still reading about .31 MVAC on the cathode of CR3, and the machine is still dead as a dead thing!!! The only things i didn't replace was CR1 and CR2 and C51 and C50 So frustrating! Not sure what to do now :-( Phil On Aug 17, 2009, at 1:12 AM, Nate Lawson wrote: > I agree. I went there a few times in 2005-2006 and it wasn't the same. > Raw components were hard to find, and the sleek consumer electronics > stuff had moved to mega stores like Bic Camera in other areas of > Tokyo. Sad. > > -Nate > > Philip Lord wrote: >> Yes..I'm quite privileged to have such an electronic mecca just >> 30mins >> away. >> Unfortunately Akihabara as I once knew it is dead (or at least it's >> in >> it's death throws). Gone are most of the small 'nook and cranny' >> stores >> where you could rummage for hours and find all sorts of interesting >> junk. It's now populated by Otaku anime and Cos-play shops and multi >> floor mega stores. >> >> :-( >> >> >> On Aug 13, 2009, at 10:54 AM, Bil Herd wrote: >> >>> All us old Commodore types used to hit Akihabara whenever we were in >>> Tokyo. Rumor has it that CBM-J would occasionally run down there to >>> buy a few scoops of 7407's to keep production flowin. >>> >>> Bil >>> >>> -----Original Message----- >>> From: owner-cbm-hackers@ling.gu.se >>> [mailto:owner-cbm-hackers@ling.gu.se] On Behalf Of Philip Lord >>> Sent: Wednesday, August 12, 2009 9:37 PM >>> To: cbm-hackers@ling.gu.se >>> Subject: Re: Dead PET 2001 >>> >>> Great! >>> I'm going to race into Akihabara this lunch time and get all the >>> CR3, >>> C11, C12, C13, VR3, VR4, VR5, and VR6 parts. >>> Hopefully I'll have time this weekend to attack the board starting >>> with the CR3 diode. >>> >>> Thanks again for your help, and I'll let you know how I go. >>> >>> Cheers >>> Phil >>> >>> >>> >>> On Aug 12, 2009, at 2:40 PM, William Levak wrote: >>> >>>> On Wed, 12 Aug 2009, Philip Lord wrote: >>>> >>>>> I was just about to say that Pin2 is connected to one of the red >>>>> leads that goes to the capacitor, therefore with the red leads >>>>> disconnected there would be 0V at pin2, but instead I decided to >>>>> test it anyway...I got 0.5VDC!!!! Then I realized what is >>>>> happening: >>>>> >>>>> When I disconnect the two red leads from the capacitor, but still >>>>> have the two leads connected together the voltage reads 0.5VDC at >>>>> pin4 and pin2. When the red leads are disconnected from the >>>>> capacitor, and also disconnected from each other I get just over >>>>> 8VDC at pin4, and 0VDC at pin2 (as expected). >>>>> >>>>> ...as for a glow from the monitor filliment, I had to turn off all >>>>> the lights to see it, but yes indeed, there is a glow. >>>> >>>> This is good! This means that the transformer, the big filter >>>> capacitor, and CR1 and CR2 are all good. >>>> >>>> The problem is localized to CR3, C11, C12, C13, VR3, VR4, VR5, or >>>> VR6. One or more of those is bad. The prime suspect is CR3. If it >>>> was working, you should see 8V on pin 2. These diodes get hot when >>>> operating. If it is cold, it is probably open. >>>> >>>> Now would be a good time to remove the circuit board. Small >>>> things, >>>> like paper clips, sometimes get trapped under there, and short >>>> things out. >>>> The screw on the left rear of the board is a ground to the chasis. >>>> The others should not contact any circuits. >>>> >>>> wlevak@sdf.lonestar.org >>>> SDF Public Access UNIX System - http://sdf.lonestar.org >>>> >>>> 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 list > > -- > Nate > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2009-08-17 08:00:08
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