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2006-03-22 by synthmdl76
I have seached the post and seen simular probs. The leds and displace just flash but no power up. The supply is just ticking and I think it may be a overcurrent protection cuase a cap is bad. All my output voltages are messed up. the +/-12 is at 8v and the 5 is at 3.5v. anyone seen this problem and know for sure what it may be? I may just replace all the caps to see.
2006-03-22 by Russell Rose
hate to say it, but that is the suresign of a power supply gone south, hope i am wrong. that there are shorts( leaky bypass caps) across the 5 and 12 volt rails all of a sudden seems as likely as maybe the cheshire cat playing croquet with the Queen of Spades. and then winning.
On Mar 21, 2006, at 11:35 PM, synthmdl76 wrote: > I have seached the post and seen simular probs. The leds and displace > just flash but no power up. The supply is just ticking and I think it > may be a overcurrent protection cuase a cap is bad. All my output > voltages are messed up. the +/-12 is at 8v and the 5 is at 3.5v. > anyone seen this problem and know for sure what it may be? I may just > replace all the caps to see. > > > > > > Emax and Emax II User's Group Website > > http://www.silveriafamily.com > Yahoo! Groups Links > > > > > >
2006-03-22 by ted Summers
Well, while Russ may be right, if you have the time, you could certainly pull those caps and try them on a DMM and see if they are shorted (although a capacitance tester would be a better bet, if you had access to one). You have nothing to lose but the time spent looking into it.... if a cap goes bad, it might take other components with it. If my supply was dead, I would try and fix it. After removing the caps (especially if one was shorted), you could then start measuring points on the PCB to see if anything else appears shorted on the board. But that is just me....with 15+ years of working on electronics in industry, even without a schematic I could figure out what was wrong... then the question would be availability of the old part.... that would be the hardest thing to get potentially.... You could also look for cold solders. When I replaced my LCD and floppy drive right after buying my Emax, I resoldered the complete power board to try and avoid future failure that could be caused by cold solders..... Weigh that with how much expertise you have. You could get an open frame PS that would do the job for about $30 if you know where to look. Some people have used a PC power supply (small form factor). I would have to look at my PS before I would commit to the PC way..... Thanks, Ted
On Mar 22, 2006, at 2:51 AM, Russell Rose wrote: > hate to say it, but that is the suresign of a power supply gone > south, hope i am wrong. > that there are shorts( leaky bypass caps) across the 5 and 12 volt > rails all of a sudden > seems as likely as maybe the cheshire cat playing croquet with the > Queen of Spades. and then winning. > On Mar 21, 2006, at 11:35 PM, synthmdl76 wrote: > >> I have seached the post and seen simular probs. The leds and >> displace >> just flash but no power up. The supply is just ticking and I >> think it >> may be a overcurrent protection cuase a cap is bad. All my output >> voltages are messed up. the +/-12 is at 8v and the 5 is at 3.5v. >> anyone seen this problem and know for sure what it may be? I may >> just >> replace all the caps to see. >> >> >> >> >> >> Emax and Emax II User's Group Website >> >> http://www.silveriafamily.com >> Yahoo! Groups Links >> >> >> >> >> >> > > > > Emax and Emax II User's Group Website > > http://www.silveriafamily.com > Yahoo! Groups Links > > > > > > >
2006-03-22 by Russell Rose
ON FUrther thought, did you try disconnecting the power supply from the load and then testing the power supply? To be on the safe side, you may want to shunt the output of the supply with appropiate load resistors before you attempt this. say 15ohm for the 5 volt side and 25-40 ohms for the 12 volters. By the way last time I checked EPR Electronics had drop in replacement power supplies, kinda pricey.
On Mar 22, 2006, at 10:04 AM, ted Summers wrote: > Well, while Russ may be right, if you have the time, you could > certainly pull those caps and try them on a DMM and see if they are > shorted (although a capacitance tester would be a better bet, if you > had access to one). You have nothing to lose but the time spent > looking into it.... if a cap goes bad, it might take other > components with it. If my supply was dead, I would try and fix it. > After removing the caps (especially if one was shorted), you could > then start measuring points on the PCB to see if anything else > appears shorted on the board. But that is just me....with 15+ years > of working on electronics in industry, even without a schematic I > could figure out what was wrong... then the question would be > availability of the old part.... that would be the hardest thing to > get potentially.... > > You could also look for cold solders. When I replaced my LCD and > floppy drive right after buying my Emax, I resoldered the complete > power board to try and avoid future failure that could be caused by > cold solders..... > > Weigh that with how much expertise you have. You could get an open > frame PS that would do the job for about $30 if you know where to > look. Some people have used a PC power supply (small form factor). I > would have to look at my PS before I would commit to the PC way..... > > Thanks, > Ted > > On Mar 22, 2006, at 2:51 AM, Russell Rose wrote: > >> hate to say it, but that is the suresign of a power supply gone >> south, hope i am wrong. >> that there are shorts( leaky bypass caps) across the 5 and 12 volt >> rails all of a sudden >> seems as likely as maybe the cheshire cat playing croquet with the >> Queen of Spades. and then winning. >> On Mar 21, 2006, at 11:35 PM, synthmdl76 wrote: >> >>> I have seached the post and seen simular probs. The leds and >>> displace >>> just flash but no power up. The supply is just ticking and I >>> think it >>> may be a overcurrent protection cuase a cap is bad. All my output >>> voltages are messed up. the +/-12 is at 8v and the 5 is at 3.5v. >>> anyone seen this problem and know for sure what it may be? I may >>> just >>> replace all the caps to see. >>> > > > >
2006-03-23 by synthmdl76
Well, It aint even ticking now. and no voltage passed the large metal transformer... I think its dead. I have a real hard time believing we cant get a simular newer supply on the net besides having to use a pc supply. Heck, its only 5, +\-12 volts ;-/ Im going to do some looking... ill let you know... Thanks all for your input, you guys rule!
2006-03-23 by synthmdl76
Well, The more I look the more I like the $20 pc power supply. You can get them with a quit fan and they provide PLENTY of current. I assume there are clean running if they are used in pc's. This seems Like a simple logical choice. --- In emax@yahoogroups.com, "synthmdl76" <synthmdl76@...> wrote:
> > Well, It aint even ticking now. and no voltage passed the large metal > transformer... I think its dead. I have a real hard time believing we > cant get a simular newer supply on the net besides having to use a pc > supply. Heck, its only 5, +\-12 volts ;-/ Im going to do some > looking... ill let you know... Thanks all for your input, you guys rule! >
2006-03-23 by synthmdl76
Well after reading the post from another lad on this page im confident in the pc power supply upgrade...
2006-03-23 by aprea
sure! it's the way to go. very easy too (thank you Jean-Marc!) feel free to ask some advice. regards, davide synthmdl76 wrote:
>Well after reading the post from another lad on this page im confident >in the pc power supply upgrade... > > > > > >Emax and Emax II User's Group Website > >http://www.silveriafamily.com >Yahoo! Groups Links > > > > > > > > > >
2006-03-23 by synthmdl76
Davide, You have been using this setup for what, 5 months and no problems? You know how long Jean-Marc has been using it? --Mike --- In emax@yahoogroups.com, davide:aprea <pasquale.aprea@...> wrote:
> > sure! > it's the way to go. > very easy too (thank you Jean-Marc!) > > feel free to ask some advice. > regards, > davide > > > synthmdl76 wrote: > > >Well after reading the post from another lad on this page im confident > >in the pc power supply upgrade... > > > > > > > > > > > >Emax and Emax II User's Group Website > > > >http://www.silveriafamily.com > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > >
2006-03-23 by aprea
5 months and no problems of any sort about jm's experience i don't know, but sure he knows. anyway, as far as i know, pc psu should be more reliable than the original and the output cleaner, more gentle towards emax components best-regards davide synthmdl76 wrote:
>Davide, >You have been using this setup for what, 5 months and no problems? >You know how long Jean-Marc has been using it? >--Mike > >--- In emax@yahoogroups.com, davide:aprea <pasquale.aprea@...> wrote: > > >>sure! >>it's the way to go. >>very easy too (thank you Jean-Marc!) >> >>feel free to ask some advice. >>regards, >>davide >> >> >>synthmdl76 wrote: >> >> >> >>>Well after reading the post from another lad on this page im confident >>>in the pc power supply upgrade... >>> >>> >>> >>> >>> >>>Emax and Emax II User's Group Website >>> >>>http://www.silveriafamily.com >>>Yahoo! Groups Links >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> > > > > > > >Emax and Emax II User's Group Website > >http://www.silveriafamily.com >Yahoo! Groups Links > > > > > > > > > >
2006-03-25 by synthmdl76
I added some pic of my PSU upgrade... and a upgrade it is. The fan is really quite(cant hear it over my other gear) and the circulating air in the Emax is a Plus to.
2006-03-25 by synthmdl76
I added some pic of my PSU upgrade in the photo folder.... and a upgrade it is. The fan is really quite(cant hear it over my other gear) and the circulating air in the Emax is a Plus to. It even glows a cool blue!