HMV 2320 capacitor polarity

[judemac]

Originally Posted by DMcMahon

Yes can the OP check that C61 metal can or its -ve terminal is not touching somehow the metalwork/ground, looks like possibly mounted on insulated mount.

The old can capacitors do sit on an insulated ring so not touching the metalwork.

On advice i replaced the C61 with a 500v 100microfarad with the negative replacing the wide negative.
and the C60 with 2 x 400v 68 mf with the negative leads together to the wide negative and the positive legs to the 2 other terminals.

[Techman]

They're definitely old/used ones shown in the first pictures.

[judemac]

Originally Posted by Techman

They're definitely old/used ones shown in the first pictures.

Yes they are the old ones that came out, replaced with the photos attached.
When testing this was when the resistor started to smoke and get VERY hot so i replaced them with the old caps again, but now that resistor is still smoking and getting very hot.
I tested its resistance and its coming up as ok.
So I'm abit confused and not sure what to do next.

[Techman]

Originally Posted by judemac

i replaced them with the old caps again, but now that resistor is still smoking and getting very hot.
I tested its resistance and its coming up as ok.
So I'm abit confused and not sure what to do next.

So the resistor is fine, albeit a bit cooked, so you've definitely got another fault somewhere. With the set disconnected from the supply you need to do some resistance checks further along the HT line to deck to see what's dragging the supply down and drawing too much current and cooking that resistor.

[DMcMahon]

Yes would be good to see photo of the new replacements that were fitted before he refitted the original ones.

David

[Techman]

I've just looked at the circuit and it's a strange arrangement that I have to say I'm not immediately familiar with in a bog standard radiogram type thing. I'm only guessing, but I think it's possible that you've introduced a man made fault somehow, perhaps you connected the replacement capacitors the wrong way round and it's blown something else up. I would check all four diodes of that bridge rectifier and carefully check all your work against original photos that you "hopefully" took before you began.

[Techman]

Originally Posted by DMcMahon

Yes would be good to see photo of the new replacements that were fitted before he refitted the original ones.

David

He's posted pictures of the new ones in post #23, David.

[Techman]

Originally Posted by judemac

On advice i replaced the C61 with a 500v 100microfarad with the negative replacing the wide negative.
and the C60 with 2 x 400v 68 mf with the negative leads together to the wide negative and the positive legs to the 2 other terminals.

Is it me or am I missing something here, but we're talking about two capacitors, C60 and C61. However, the OP is describing 3 separate capacitors connected to three separate positive terminals. The pictures of the original capacitors clearly show 3 capacitors, 2 in one can and 1 in another can - that adds up 3, so where's this other capacitor?

[ms660]

Originally Posted by Techman

Is it me or am I missing something here, but we're talking about two capacitors, C60 and C61. However, the OP is describing 3 separate capacitors connected to three separate positive terminals. The pictures of the original capacitors clearly show 3 capacitors, 2 in one can and 1 in another can - that adds up 3, so where's this other capacitor?

C59. Just after exit stage left of the snippet schematic, left side of R40.

Lawrence.

[Techman]

Originally Posted by ms660

C59. Just after exit stage left of the snippet.

I see, just after R40.

[DMcMahon]

Yes would be good to see photo of the new replacements that were fitted before he refitted the original ones.

David

[Techman]

I can't see how he would have connected the new capacitors the wrong way round as the negative is marked and on the three legged one it would be obvious anyway.

[Techman]

Originally Posted by DMcMahon

Yes would be good to see photo of the new replacements that were fitted before he refitted the original ones.

David

I think David isn't refreshing the page

[DMcMahon]

Originally Posted by Techman

He's posted pictures of the new ones in post #23, David.

Strange, never saw that Post and a couple of others surrounding it when I sent my post.

David

[DMcMahon]

Originally Posted by Techman

I think David isn't refreshing the page

Yes somehow not seeing all the latest Posts in real time ?

David

[judemac]

Originally Posted by Techman

I've just looked at the circuit and it's a strange arrangement that I have to say I'm not immediately familiar with in a bog standard radiogram type thing. I'm only guessing, but I think it's possible that you've introduced a man made fault somehow, perhaps you connected the replacement capacitors the wrong way round and it's blown something else up. I would check all four diodes of that bridge rectifier and carefully check all your work against original photos that you "hopefully" took before you began.

Can i check the bridge rectifier in circuit or do I need to take it out of circuit?

[DMcMahon]

To check the bridge rectifier diodes it is best to disconnect the external wiring/connections.

David