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 Post subject: Re: ZPA 0.5 control board problem
PostPosted: Mon Feb 10, 2020 2:04 am 

Joined: Sat Aug 06, 2011 1:18 am
Posts: 119
until now I couldn't find out why the yellow LED is working for 1- 2 seconds when powering up.
But in the end I think this is the normal operation of the amp. I have several other ZPA's in a daily system and when powering them up I have seen never a Yellow LED lighting up. But then I thought, what happens when I remove the 12v continuous power from the terminals and make sure that all the caps of the amp are empty. Well when I power up after doing this the yellow LED is also lighting up for 1-2 seconds. So the time the caps need to charge the yellow LED is working. Once the 12v continues power is connected the yellow led stays always off. I think I have one problem less...
Can other ZPA owners confirm this?


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 Post subject: Re: ZPA 0.5 control board problem
PostPosted: Mon Feb 10, 2020 3:52 pm 
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Joined: Sat Apr 19, 2008 11:57 pm
Posts: 1479
Location: Beaverton 48612
I checked my 0.3 that I use as a reference amp on the bench the day after I replied last time. This amp is on a power supply and it's completely without power for 12+ hours before I fire up the shop in the mornings. I wouldn't swear to the caps being completely discharged, but I expect they are. I'll double check tomorrow.

My 0.3 does not light the yellow thermal led at any time as it's powering up. In the case of my amp, the remote is switched via a head unit still, so it will not be going high at the exact same time as the power supply comes up. If you have the remote hard wired to b+, that may be why you are getting odd behavior. I'd try connecting the constant power connections and then remote to see how it behaves.

Good luck,
Jason



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M: M100, M44 for a custom amp project
Zx: Zx500, Zx450, Black Zx350
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 Post subject: Re: ZPA 0.5 control board problem
PostPosted: Wed Feb 12, 2020 1:47 pm 
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Joined: Sat Apr 19, 2008 11:57 pm
Posts: 1479
Location: Beaverton 48612
I can confirm that if A)remote goes high before the B+ or B) Remote and B+ go high together, that the thermal LED does indeed light on power-up. This is probably not a great way to power the amp, and the fact that it does this means that parts of the protection circuitry are having their power supplies come up in the wrong order.



_________________
M: M100, M44 for a custom amp project
Zx: Zx500, Zx450, Black Zx350
ZxTi: 4 Zx600Ti's, 1 Zx400Ti
Ti: 5 800.1's & 900.7 for a custom amp project. 1 1200.1, 1 1000.2
Tantrum: 2 1200.1's, 1 600.4, 1 500.2
XS: XS6600
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