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Spot the deliberate mistake

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kedwardsleisure View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Topic: Spot the deliberate mistake
    Posted: 13 October 2023 at 12:25pm
Kevin

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APW View Drop Down
Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote APW Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2023 at 10:42am
Can’t wait… love a pot-noodle pic!!
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kedwardsleisure View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2023 at 10:39am
Yes you have it but you'll have to wait til lunchtime for the overhead view of my lunch.

Each psu had 2 6mm holes and pop rivets. The rivets went stright through the board in both places, one through the neutral mains track and the other through the IGBT feed to the switching transformer.

Circuit totally obliterated.

Amused they did it twice, an easy way to waste £400






Kevin

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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote APW Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2023 at 10:03am
Looks like they have drilled the case and used pop-rivets, and not the M3/M4 fixing locations provided by Meanwell
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MattStolton View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattStolton Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2023 at 9:53am
Under the screw terminals looks to be a 110/230V slider switch? Something in red?
Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains"
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kedwardsleisure View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2023 at 9:43am
not exactly.
Kevin

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simonp1100 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonp1100 Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2023 at 9:36am
Could it be that the customer is using long fixing screws to attached the power supply to a base and the screws are hitting the PCB board inside ?.LOL
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kedwardsleisure View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2023 at 9:30am
Haven't had one of these for a while so as it's a Friday...

Not specifically speaker related but a ubiquitous Meanwell 600W power supply.
Client installed one in his enclosure and it went bang. Bought another and installed that, it went bang too.

Very unusual as Meanwell are a pretty decent product in my experience.
A photo of my recently made pot noodle for the correct guess.







Kevin

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Lucasdude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2023 at 4:48pm
Didn't we cover this "wrap around the pole" termination technique last year?
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kedwardsleisure View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2023 at 10:17am
Can't blame the chinese this time as they're made in the UK. I suppose the girl wiring it could've had something on her mind, although you'd think QC would've picked it up. At least it wasn't an earth.
Kevin

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MattStolton View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattStolton Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2023 at 10:02am
I like my solder joints, like I like my Martinis, "Dry".

However, that isn't just "dry", more "absent"?
Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains"
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kedwardsleisure View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2023 at 9:26am
Marshall JCM800 Jubilee Special. Client reports making strange crackling noises.



Edited by kedwardsleisure - 10 February 2023 at 9:27am
Kevin

North Staffordshire

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