AR2412 not booting…. or is it??

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This topic contains 20 replies, has 9 voices, and was last updated by Profile photo of Geoff Geoff 12 months ago.

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  • #53287
    Profile photo of eotsskleet
    eotsskleet
    Participant

    George.. Do you know google? ;)as I expected.. CHF and USD is almost 1:1! So lets say around 230USD (incl work and delivery)

    #53567
    Profile photo of eotsskleet
    eotsskleet
    Participant

    Got my repaired AR2412 back today – it looks like working fine again! Ordered an AB168 as extension/backup – 40XLR Inputs on Stage.. wohooo ;D

    #54858
    Profile photo of topdj
    topdj
    Participant

    did the revision the power supply? I sure hope so,

    #112585
    Profile photo of Geoff
    Geoff
    Participant

    I recently bought an SQ5 and borrowed an AR2412 from a friend to use on a larger job. He warned me that it sometimes “takes 20 minutes to boot up”, and one time he actually had to relocate the console to the stage and mix from there. At first, it worked fine for me, powered right up and connected to the SQ5, no problem. During testing later on it failed, with the same symptoms others have mentioned, no lights on the front or back but the fan was running. It’s about four years old, so well out of warranty, and my friend said to open it up and see what you find.

    Fortunately once I got it apart (a lot of screws!), it was still malfunctioning, and I was able to test PSU voltages. ±15 and +48 were all there, but nothing on the +10V rail, which also feeds the blue LED on the back. That ruled out the primary side of the PSU, and nothing appeared to be bulged or burnt with the components for the +10V part of the supply. There was continuity all the way from the cathode of the rectifier diode to the output, but I reheated all the connections, partially reassembled it, and tried it again. This time the 10V was solid and seems to be staying that way. Although I couldn’t see anything that looked like a cold joint, I think there was one and reflowing the connections has fixed it for now.

    I didn’t get into any of the circuit boards on the front panel, but I suspect the +10V gets regulated down to +5V for all the digital circuits there.

    A word of caution: This is a switch mode power supply. It is connected directly to the AC line, and there are voltages in there that can KILL you. The main electrolytic capacitor has about 170 volts on it, and there will be twice that if you’re in 230V land. It’s a place only an experienced electronics tech should be poking around, not an enthusiastic DIYer.

    Geoff

    #112592
    Profile photo of NZdave
    NZdave
    Participant

    Thank you Geoff for that info
    QUESTION : So was that the newer BLACK or PURPLE series?
    I’m about to power up with [QU series] multiples of these after a 5 years of not using these.
    I never originally had any issues of powering these up.
    Cheers
    Dave

    #112598
    Profile photo of Geoff
    Geoff
    Participant

    It was one of the purple AR2412s that had the problem. I’ve since bought my own, and it is the newer(?) black version with locking XLR inputs. No problems at all with it, although I don’t have a lot of time on it yet. I have not been curious enough to open it up and see if the PSU is the same or similar to the purple one. If it keeps on behaving itself, I probably won’t.

    Geoff

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