Hello,
I have a Parasound A23 amplifier. It has several relays, can be started by audio signal, 12V trigger or manually. I give this precision just in case.
When plugged to the mains you have a P with red light.
When started you have Two blue lights in front.
You also have a Temp light which is always off.
Now the problem.
Amplifier stays online for several seconds or minute then it can :
A switch off the output and the blue lights
B switch off everything including the red light. In that case you have to unplug from the mains and plug again.
I opened the amp. All fuses are intact. nothing looks burnt.
Dont know what could be the problem or what I shall do.
Any thoughts ?
Regards, Greg.
I have a Parasound A23 amplifier. It has several relays, can be started by audio signal, 12V trigger or manually. I give this precision just in case.
When plugged to the mains you have a P with red light.
When started you have Two blue lights in front.
You also have a Temp light which is always off.
Now the problem.
Amplifier stays online for several seconds or minute then it can :
A switch off the output and the blue lights
B switch off everything including the red light. In that case you have to unplug from the mains and plug again.
I opened the amp. All fuses are intact. nothing looks burnt.
Dont know what could be the problem or what I shall do.
Any thoughts ?
Regards, Greg.
Have you monitored the input trigger and auto on settings? Likely an issue with auto turn on and no input drive. If it still cycles on its own, check switch settings on back and monitor the AC line voltage.
Hello,
With the help of profiguy who kindly gave me some troubleshooting advice,
I disconnected the input motherboard and turn the amp on.
After several minutes, something between 1 and 15, it goes off with a relay sound. All fuses are intact.
I don't know if it is a relay problem or if a protection is triggered, but what protection?
Unfortunately it is going to be harder to investigate.
With the help of profiguy who kindly gave me some troubleshooting advice,
I disconnected the input motherboard and turn the amp on.
After several minutes, something between 1 and 15, it goes off with a relay sound. All fuses are intact.
I don't know if it is a relay problem or if a protection is triggered, but what protection?
Unfortunately it is going to be harder to investigate.
The auto trigger switch is of course set in middle position, manually. When on, if the switch is displaced, it turns off with the same relay noise.
Here we can see the amp without the input motherboard.
What I find strange is that the red light goes off and after a few seconds goes on again
What I find strange is that the red light goes off and after a few seconds goes on again
Similar problem here...
https://forum.polkaudio.com/discussion/79525/parasound-halo-a-21-rapidly-shutting-on-and-off
https://forum.polkaudio.com/discussion/79525/parasound-halo-a-21-rapidly-shutting-on-and-off
Hello,
I started to try to understand the principle of the schematics and why would the relay go off.
I understand that there are some DC current feeding relays and other stuff. These components are hooked to a radiator. I started to look at u10 and u5.
So u10,
Amp idle you have 14v ; ground ; 0
Turn amp on : 14v ; ground ; more than 10. This decreases and when goes below 5v amp goes off.
After a while off now showing 8v ; 0 ; 3.5v...weird
Then, is there a problem with that component or is there something counter feeding the output to make voltage lower because of a problem
I started to try to understand the principle of the schematics and why would the relay go off.
I understand that there are some DC current feeding relays and other stuff. These components are hooked to a radiator. I started to look at u10 and u5.
So u10,
Amp idle you have 14v ; ground ; 0
Turn amp on : 14v ; ground ; more than 10. This decreases and when goes below 5v amp goes off.
After a while off now showing 8v ; 0 ; 3.5v...weird
Then, is there a problem with that component or is there something counter feeding the output to make voltage lower because of a problem
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I remember when speakers were hooked I was surprised to find 12 ohms sometimes between the two red speakers connectors.
I had a spark at u10, call me stupid.
But amp is still on and sometimes output impedance goes at 2 ohm, then OL on both side. Volt meter or something wrong...
Why doesn't he go off, did I finally smashed the protection circuit u10 ? All voltage are around zero on that one. If it still runs I will try too hook some test gear
I had a spark at u10, call me stupid.
But amp is still on and sometimes output impedance goes at 2 ohm, then OL on both side. Volt meter or something wrong...
Why doesn't he go off, did I finally smashed the protection circuit u10 ? All voltage are around zero on that one. If it still runs I will try too hook some test gear
Today amp was running.
Then I plugged the input motherboard board again. Amp goes off again. I don't think it is related to the input board, I am sure it will go crazy again.
It is driving me nuts.
Then I plugged the input motherboard board again. Amp goes off again. I don't think it is related to the input board, I am sure it will go crazy again.
It is driving me nuts.
Hello,
Just to keep you posted and for people who encounter a similar problem...
I sold the amp for 200$ to a guy who had not seen the amp and buys defective equipment in order to fix them and make some money.
He told me there was a defective component close to the power supply.
I know that there is now no more support for parasound in France or maybe in Europe.
I sold the working amp and bought a purifi amp from audiophonics. The amp is amazing, very low white noise, very transparent. You can't tell is class d.
Now I have two of them for the mids ans the highs.
Regards, Greg.
Just to keep you posted and for people who encounter a similar problem...
I sold the amp for 200$ to a guy who had not seen the amp and buys defective equipment in order to fix them and make some money.
He told me there was a defective component close to the power supply.
I know that there is now no more support for parasound in France or maybe in Europe.
I sold the working amp and bought a purifi amp from audiophonics. The amp is amazing, very low white noise, very transparent. You can't tell is class d.
Now I have two of them for the mids ans the highs.
Regards, Greg.