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Powersoft amp module

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dlyxover View Drop Down
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    Posted: 12 November 2019 at 10:50pm
A client has 4x active cabs with Powersoft amp modules.

2x of the cab have a issue with the gain pot so opened one up sprayed servisol in the pot and seemed to sort it out

but

I did notice what look like some caps and maybe a choke? that look bit questionable on all 4 units.


The system is stored in a unheated garage (moisture issues indeed) but when I took the photos they had been inside a warm room for 1 hr and we had sound checked for 20 mins.

Thoughts please

input appreciated 
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Printman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Printman Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 1:54pm
I will get those caps changed just in case because if they are where they are in the circuit you may have trouble ahead 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote M4trix Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 4:04pm
What kind of nasty potting stuff they used there !? It looks like an oval black building brick used for chimneys. It's all over the place.

LOL

Edit: btw, it's the main SMPS transformer.




Edited by M4trix - 22 November 2020 at 4:07pm
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Earplug View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 4:50pm
Do you mean the little choke at the bottom in the second photo? That does look like it might have some mould or something on it!

Maybe clean it up a bit with some alcohol?



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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 7:07pm
Second photo,the capacitor on the edge of the board in the centre of the photo looks corroded,as does the mounting screw right next to it,i'm assuming they use the screws as earthing points as well as fixings for the baseplate. Being a Powersoft unit,you would think they would have used decent components and plated screws, or at least made some attempt to prevent corrosion. What do they charge for these modules?  
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dlyxover View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dlyxover Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 8:10pm
These were working last they were used (march 2020) the gain pots were still funky.

I don't have access to they system as its a clients and it been sat in the same garage since then.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2020 at 10:03pm
Originally posted by jbl_man jbl_man wrote:

Second photo,the capacitor on the edge of the board in the centre of the photo looks corroded,as does the mounting screw right next to it,i'm assuming they use the screws as earthing points as well as fixings for the baseplate. Being a Powersoft unit,you would think they would have used decent components and plated screws, or at least made some attempt to prevent corrosion. What do they charge for these modules?  

The “capacitor” is actually a small ferrite cored heatshrink covered inductor.
The screws look like they have been attacked by a combination of glycol based fog fluid residue and damp storage. Ive seen this many times, often on fog machines. The screws will be zinc plated, but thats how they end up. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Printman Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2020 at 1:14am
Looking into a bit more it's the smps circuit becareful around there 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2020 at 1:26pm
Originally posted by csg csg wrote:

Originally posted by jbl_man jbl_man wrote:

Second photo,the capacitor on the edge of the board in the centre of the photo looks corroded,as does the mounting screw right next to it,i'm assuming they use the screws as earthing points as well as fixings for the baseplate. Being a Powersoft unit,you would think they would have used decent components and plated screws, or at least made some attempt to prevent corrosion. What do they charge for these modules?  

The screws look like they have been attacked by a combination of glycol based fog fluid residue and damp storage. Ive seen this many times, often on fog machines. The screws will be zinc plated, but thats how they end up. 


Replace them with brass screws would be a better option? If they are used as earthing 0v points, they will need replacing.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2020 at 1:47pm
Originally posted by csg csg wrote:

Originally posted by jbl_man jbl_man wrote:

Second photo,the capacitor on the edge of the board in the centre of the photo looks corroded,as does the mounting screw right next to it,i'm assuming they use the screws as earthing points as well as fixings for the baseplate. Being a Powersoft unit,you would think they would have used decent components and plated screws, or at least made some attempt to prevent corrosion. What do they charge for these modules?  

The “capacitor” is actually a small ferrite cored heatshrink covered inductor.
The screws look like they have been attacked by a combination of glycol based fog fluid residue and damp storage. Ive seen this many times, often on fog machines. The screws will be zinc plated, but thats how they end up. 



Yup. Otherwise the caps on there actually look ok. No need to replace.


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