Powersoft amp module |
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dlyxover
Old Croc Joined: 14 June 2007 Location: Liverpool Status: Offline Points: 1508 |
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Posted: 12 November 2019 at 10:50pm |
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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
Registered User Joined: 16 November 2020 Location: London Status: Offline Points: 10 |
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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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M4trix
Registered User Joined: 23 June 2009 Location: Croatia Status: Offline Points: 445 |
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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. Edit: btw, it's the main SMPS transformer. Edited by M4trix - 22 November 2020 at 4:07pm |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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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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Earplugs Are For Wimps!
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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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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Be seeing you.
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dlyxover
Old Croc Joined: 14 June 2007 Location: Liverpool Status: Offline Points: 1508 |
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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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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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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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Printman
Registered User Joined: 16 November 2020 Location: London Status: Offline Points: 10 |
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Looking into a bit more it's the smps circuit becareful around there
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11154 |
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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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Be seeing you.
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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Yup. Otherwise the caps on there actually look ok. No need to replace. |
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Earplugs Are For Wimps!
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