Re: Electro Voice SXA series 100 or 250 powered PA speaker Schematic needed
Oh i was just wondering.
They probably buy the module. It's not uncommon ...
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Re: Electro Voice SXA series 100 or 250 powered PA speaker Schematic needed
This is for the SXA 180. That's all i could find.
Edit: Looking at it. I've seen this exact class D Amp schematic before in HK and JBL subwoofers. Is Electro Voice related to HK? Of is this some standard module manufacturers buy?...Last edited by proditaki; 09-18-2023, 04:22 AM.
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Re: JBL ES-150-P standby issue
Ok i fixed it.
The service manual was rev 0.
In the revision i have they changed a few things and they use a 6v power supply for the mute/standby circuit, which i completely missed because the 15v power supply is still there (obviously, it's just disconnected from that circuit ) .
THe +6V / -6V power supply was more like +4.5 / -7V because of one failed cap. So i replaced them all, it's working fine now. Thanks!
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Re: JBL ES-150-P standby issue
Yeah the sound seems fine.
I did check the caps on the +15V lines and replaced some (which were borderline faulty) by new ones (which i checked before replacing) but to no effect.
Id did check the "big" caps on vcc+/- and vbb+/-
so yeah probalby something in the mute circuit.
i already replaced U103 for a brand new opamp (you see it sitting in a socket in the pictures i took because the pcb traces are quite fragile and i didnt want to have to desolder it twice)
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Re: JBL ES-150-P standby issue
Also replaced C18 & C19 but no difference.
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Re: JBL ES-150-P standby issue
The ESR on C16 and C17 is fine. i removed them from circuit to test. Well within spec....
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Re: JBL ES-150-P standby issue
Ok. I took some pictures. I already had it reasembled for testing...Last edited by proditaki; 08-31-2023, 08:57 AM.
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JBL ES-150-P standby issue
Hello,
I recently bought a faulty JBL ES-150P subwoofer that was completely dead.
After replacing 2 open resistors (R255 and R256) in the DC Power supply the unit started working.
It plays fine. But when it wants to go into standby mode, after 10 minutes, it starts cycling for a while. (see video [URL="https://youtube.com/shorts/RdbA_J7DPQU?feature=share"]on youtube[/URL])
The noise from the speaker goes away and i'm pretty sure the interval changes and i only hear one relay clicking on the end (light still goes red/green)
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