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Spot the deliberate mistake |
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kedwardsleisure 
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 5157 |
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 Posted: 13 September 2024 at 4:51pm |
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A nice Friday afternoon mini quiz. Behringer DCX2496, arrived from another dealer. 'blows fuses'. Too late for lunch but a pic of my evening meal for the winner.
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Kevin
North Staffordshire |
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Pinyorouk
Young Croc 
Joined: 31 January 2011 Status: Offline Points: 593 |
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Posted: 13 September 2024 at 4:58pm |
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Screw too long shorting live to ground. The one to the rear right of the picture. On/off switch.
Edited by Pinyorouk - 13 September 2024 at 5:22pm |
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MattStolton
Old Croc
Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4207 |
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Posted: 13 September 2024 at 5:08pm |
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The grey rubber/silicon looking "sleeve" stuffed in the black/red wires to left of PSU section.
Is that supposed to isolate a Voltage regulator or transistor or T0-220 packed component with a live metal tab, and it isn't? Or is it supposed to sleeve the DC output wires (those same red and black wires) against the metal "houseing" of the PSU, and it isn't?
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7752 |
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Posted: 13 September 2024 at 6:05pm |
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"The grey rubber/silicon looking "sleeve" stuffed in the black/red wires to left of PSU section." +1 That sleeve is definitely not in the right place! Someone obviously forgot to replace it over one of the clipped-on devices in the PSU section. What's for dinner??  |
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Earplugs Are For Wimps!
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 5157 |
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Posted: 14 September 2024 at 10:45am |
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Matt got there first. The switching transistor (well..topswitch) has a live tab and has been clipped direct to the earthed heatsink, the silicone sleeve wandering about inside. Someone had been 'recapping' the power supply. A little knowledge etc...
Can't show you my dinner. It was a tin of Lidl macaroni cheese, which tastes similar to Ambrosia Creamed Rice, but saltier. |
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Kevin
North Staffordshire |
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jeff generik
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Joined: 25 November 2006 Location: Dartmouth,Devon Status: Offline Points: 219 |
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Posted: 20 September 2024 at 11:41pm |
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After poking my hands into my brothers exposed dcx whilst slightly inebriated one evening I can definitely confirm that there are exposed live parts on the PSU side! It sobered me up a bit!
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 7752 |
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Posted: 21 September 2024 at 9:29am |
All SMPS's will have high voltages floating around - even after being turned off! The filter caps might hold several hundred volts for quite a while. Not a good idea to "poke about" in there! Just like valve amps. You soon learn no poking until you've made sure that all the filter caps are fully discharged!  |
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Earplugs Are For Wimps!
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 5157 |
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Posted: 07 February 2025 at 8:24am |
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A quick friday morning quizlette, not too difficult this but this QSC PLX came with the fault report 'no power'. Pic of my lunch for the winner, which hopefully my father will bring before midday.
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Kevin
North Staffordshire |
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simonp1100
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Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1150 |
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Posted: 07 February 2025 at 8:27am |
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Looks like the top right blue DC mains capacitor is upside down
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 7752 |
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Posted: 07 February 2025 at 10:38am |
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Yup. How the hell is it being held in place - blue-tack?? |
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Earplugs Are For Wimps!
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EmPro
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Joined: 26 June 2020 Status: Offline Points: 992 |
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Posted: 07 February 2025 at 11:09am |
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Yep....another SMPS is
 :)) the blue capacitors are 3 in use and one for spare? Edited by EmPro - 07 February 2025 at 11:10am |
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EmPro Audio
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 7752 |
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Posted: 07 February 2025 at 12:46pm |
Hey - don't knock SMPS. They keep us all in work -- and the Chinese factories buzzing!! |
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Earplugs Are For Wimps!
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jeff generik wrote: