Okay is the rectifier the same one found on a C64? Can I find these like on Jameco or DIGI key or Unicorn electronics? I could Rob one from one of my breadbin.☺ Will try the rectifier first to see if the fuse problem goes away. Thanks On May 30, 2017 8:53 AM, "Gerrit Heitsch" <gerrit@laosinh.s.bawue.de> wrote: > On 05/30/2017 04:44 PM, Terry Raymond wrote: > >> Hi Clockmeister, >> >> This power source has a pigtail for powering the C64 works fine doesn't >> blow it's fuse >> Just when powering up the C128. >> >> This is helpful enough to find what regulator I need. >> > > You might want to check the bridge rectifier in the C128. If one of the 4 > diodes in it has a short it will blow the fuse. It's the black square next > to the power switch. > > Gerrit > > > > > > >> Terry >> >> On May 28, 2017 6:06 PM, "Clockmeister" <clockmeister@internode.on.net >> <mailto:clockmeister@internode.on.net>> wrote: >> >> >> >> On 29/05/2017 7:50 AM, Terry Raymond wrote: >> >> Hi >> Im needing to check all Caps on my C128 >> to check these would I read the caps in OHM's readings? >> >> Im going to desolder them one at a time just to know what ones >> are failing >> and if the >> Electrolytic is leaking out or the CAP has a bulge on the top. >> >> >> If you are going to the trouble of desoldering them, just replace >> them but do so with quality caps. >> >> This C128 is blowing the fuse in the power source, and this >> power source >> has been built from scratch from Ray Carlsen in the U.S.A. I >> trust Ray's >> work so it must be something on the >> C128's MB circuit. >> >> >> I trust Ray's work too, but that is not to say something hasn't >> failed in the supply. Does the fuse blow as soon as you power up the >> C128? >> If there is a dead short in Ray's supply I would suggest that the >> supply fuse will blow even if the C128 isn't turned on. >> >> I was also told isnt there a power regulator component that has >> 3 solder >> legs that could possibly >> cause power problems, Should this regulator read 12VDC? What >> legs do I >> probe when I read the voltages on this regulator? >> >> >> >> If it's a 78xx Voltage regulator then see here: >> https://www.engineersgarage.com/electronic-components/7805- >> voltage-regulator-ic >> <https://www.engineersgarage.com/electronic-components/7805- >> voltage-regulator-ic> >> >> Pin 1 is input voltage, 2 is ground and 3 will be the regulated >> output voltage which should match the last two digits after the 78 >> part number. IE 7805 = 5V, 7812 = 12V. >> >> >> >> 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 listReceived on 2017-06-01 19:00:03
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