Problem with super CPC

[GUNHED]

Hello. A while ago I bought a CPC in a PC case and it didn't work. Now I got one component out and it works. But I don't know what this component does or if I need it. The component is between the power supply cable (230 V) and the big transformer. It contains two fuses, which always blast if I connect power. The fuses are 1 A at 250 V (before they were 0.8 A, but it seems not to matter).


The component looks like this, what is it?


[attachimg=1]


[attachimg=2]

[tjohnson]

Hello. A while ago I bought a CPC in a PC case and it didn't work. Now I got one component out and it works. But I don't know what this component does or if I need it. The component is between the power supply cable (230 V) and the big transformer. It contains two fuses, which always blast if I connect power. The fuses are 1 A at 250 V (before they were 0.8 A, but it seems not to matter).


The component looks like this, what is it?


[attachimg=1]


[attachimg=2]

Hmm interesting is that a bridge rectifier to convert ac to dc.  I'm sure Bryce week be along shortly to help out

Sent from my E5823 using Tapatalk

[GUNHED]

Hmm interesting is that a bridge rectifier to convert ac to dc.  I'm sure Bryce week be along shortly to help out

Sent from my E5823 using Tapatalk

But seems to output AC too, because without the device the CPC works.

[luismcv]

It's a power line EMI/RF filter.

[GUNHED]

Thanks, so it does erase spikes from the power supply, right?

Then I can leave it out, because it seems to have a short.

Thank you very much!!!

[Bryce]

It a common mode choke (Gleichtaktdrosseln). It's function is to make spikes on the 240V supply cancel each other out. They tend to fail to a short quite often (especially in Amiga PSUs). You can safely leave it out. If you still want the fuses to be part of your system, then remove the choke and connect the 240V blue/brown wires to the two output pins where the choke was soldered.

Bryce.

[luismcv]

They tend to fail to a short quite often (especially in Amiga PSUs).

Or worse... The one in my Commodore CBM did this:

[attach=2]

[Bryce]

Or worse... The one in my Commodore CBM did this:

[attach=2]

That is (was) a capacitor, not a common mode choke... and I bet the house stank after that happened!

Bryce.

[luismcv]

That is (was) a capacitor, not a common mode choke... and I bet the house stank after that happened!

Bryce.

No, no. What explode was probably one of the capacitors on it, but it wasn't just a capacitor, it was a line filter:

[attach=2]

And yes, it smoked and smelled funny.

[Bryce]

Yes, it's a line filter capacitor, not a line filter choke (inductor).

Bryce.

[luismcv]

What does μH stand for then if not inductors? It even says "Drossel" (choke, afaik) there.

[Bryce]

Yes, there were 2 inductors in there too, but the main component that exploded was the capacitor. According to the casing it had 3 capacitors 0.1µf and 2x 2500pf. One of these is what exploded, not the inductor.
The part that Gunhed referred to doesn't contain any capacitors, just two inductors that are in series with the powerlines. These don't explode, they just short out. Yours is the exploding type.

Bryce.

[luismcv]

The part that Gunhed referred to doesn't contain any capacitors, just two inductors that are in series with the powerlines.

In his picture I see a capacitor in the schematics and in the specs 0.12µF.

[Bryce]

Oh, you're right. I hadn't noticed that, I thought it was a pure choke. I probably only looked at the symbol.

Bryce.