Superman2107, post: 446388, member: 50293 wrote: My cps275 +/- 17V light is not on, is it causing stop give the power to my console? I can see the lights on and off a sec when I shut down the cps275 on my console. Checked the fuse, doesn't seems like blew. Does anyone know what is happening?

Does the console work ? if yes, it may just be the power light bulb. If not, well this answer your first question.
If the light bulb is ok and fuses are ok chances are the unit is defective. Could be a few capacitors or resistances..
If you have no experience in electronic diagnostic, bring it to a repare shop.
Or buy another one and keep it as back once you made this one repared :
http://www.ebay.com/itm/Soundcraft-CPS-275-Power-Supply-Rackmount-Audio-Mixer-Console-CPS275-RW8022-/282063618136

There is some schematics in the manual : http://www.lacompagnie-events.com/pdf/cps250_275_user_guide.pdf

pcrecord, post: 446392, member: 46460 wrote: Does the console work ? if yes, it may just be the power light bulb. If not, well this answer your first question.
If the light bulb is ok and fuses are ok chances are the unit is defective. Could be a few capacitors or resistances..
If you have no experience in electronic diagnostic, bring it to a repare shop.
Or buy another one and keep it as back once you made this one repared :
http://www.ebay.com/itm/Soundcraft-CPS-275-Power-Supply-Rackmount-Audio-Mixer-Console-CPS275-RW8022-/282063618136

There is some schematics in the manual : http://www.lacompagnie-events.com/pdf/cps250_275_user_guide.pdf

The console is not working, the light bulb of the cps? No, it doesn't light up, fuse should be fine. But how does that happen? What makes the capacitors or resistances stop working suddenly?

This could be a fault in the console.

Which exact model of console is this powering? Do the power supply lights stay on if you apply mains to the power supply with the d.c. output connector unplugged?

The CPS275 manual says:

The +/-17V rails can withstand a short to ground or each other for up to one second;
if the short circuit remains for longer than one second then both of the 17V rails will
be shut down. To reset them the supply must be switched off for 6 seconds and then
switched on again.

Superman2107, post: 446395, member: 50293 wrote: fuse should be fine.

Should is not a word to use when doing diagnostic..
Many have blown the cps275 simply by pulling the plug without proper shutdown...
Boswell has a good understanding of electronics. Follow his lead ;)

Boswell, post: 446396, member: 29034 wrote: This could be a fault in the console.

Which exact model of console is this powering? Do the power supply lights stay on if you apply mains to the power supply with the d.c. output connector unplugged?

The CPS275 manual says:

Ghost 32LE, yeah PSU lights on but the +/- 17v light off

Are you saying the +/-17V lights are off even when the power supply is disconnected from the mixer?

Boswell, post: 446409, member: 29034 wrote: Are you saying the +/-17V lights are off even when the power supply is disconnected from the mixer?

Yes, even without connect to the console, the +/-17v light still off, is it a good or bad sign?

It depends on how you view it. A linear power supply is easier to fault-find than a console, but against that you have the danger associated with working in a live mains environment.

I can guide you through a diagnostic process, but I have to ask what your electronic repair skills are like?

I opened it and one internal from +/- 17V fuse blown, but i couldn't find the right amps tho, I checked the manual says 5.25amps, but the fuse that blown was 10amps and the working one is 10 as well. any idea which one should i put in?

Superman2107, post: 446453, member: 50293 wrote: I opened it and one internal from +/- 17V fuse blown, but i couldn't find the right amps tho, I checked the manual says 5.25amps, but the fuse that blown was 10amps and the working one is 10 as well. any idea which one should i put in?

The manual says F1 (for the +17V rail) and F2 (for the -17V rail) should both be 6.25A for the CPS250 PSU and 10A for the CPS275. You have the CPS275, so the 10A rating is correct. F3 protects the 48V rail, and should be 1A for both PSU models. Note that these fuses must all be T types, i.e. fast-acting - do not replace with a standard type.

So which fuse number (F1 or F2) is the blown one?

Right that was the F2 one, is that suppose to be slow blow T types?

Boswell, post: 446456, member: 29034 wrote: The manual says F1 (for the +17V rail) and F2 (for the -17V rail) should both be 6.25A for the CPS250 PSU and 10A for the CPS275. You have the CPS275, so the 10A rating is correct. F3 protects the 48V rail, and should be 1A for both PSU models. Note that these fuses must all be T types, i.e. fast-acting - do not replace with a standard type.

So which fuse number (F1 or F2) is the blown one?

Superman2107, post: 446619, member: 50293 wrote:

Tried with the new fuse, it blow right away, probably the bridge recitifer? Is it the 10A 200V, mounted on the heat sink? Thanks!