Hello friendly Badcaps community.
I have one of these on my desk today, and I have attached a service manual if it is beneficial to anyone.
It turns on OK but no audio output to speakers unless the 'pure direct' button is pressed, and even then after 30 seconds, audio stops.
There is no relay click when the sound stops, so not a relay control problem.
Headphone audio stops when speaker audio stops, so not likely a power amp problem.
It does not appear to be in any protection mode.
Factory reset has made no change.
After the first attempt to get sound, the problem takes less time to occur (5 sec), so temperature seems to be relevant.
Allowing a cool off time (placing in standby), returns 30 sec of audio function again.
Using headphone output to monitor audio instead of speakers does not change behaviour either.
So it appears something is getting hot and inhibiting audio.
FLIR imaging shows Q1810 and Q1809 getting hot, however I'm not sure if this is relevant.
I've been burned before by going after hot components that are normally running hot, pun intended. So I'm asking if anyone else has come across this sort of behaviour in these devices and if the problem was indeed found within the 'AMPPOWER (1) board or elsewhere?
Many thanks in advance for your shared wisdom.
I have one of these on my desk today, and I have attached a service manual if it is beneficial to anyone.
It turns on OK but no audio output to speakers unless the 'pure direct' button is pressed, and even then after 30 seconds, audio stops.
There is no relay click when the sound stops, so not a relay control problem.
Headphone audio stops when speaker audio stops, so not likely a power amp problem.
It does not appear to be in any protection mode.
Factory reset has made no change.
After the first attempt to get sound, the problem takes less time to occur (5 sec), so temperature seems to be relevant.
Allowing a cool off time (placing in standby), returns 30 sec of audio function again.
Using headphone output to monitor audio instead of speakers does not change behaviour either.
So it appears something is getting hot and inhibiting audio.
FLIR imaging shows Q1810 and Q1809 getting hot, however I'm not sure if this is relevant.
I've been burned before by going after hot components that are normally running hot, pun intended. So I'm asking if anyone else has come across this sort of behaviour in these devices and if the problem was indeed found within the 'AMPPOWER (1) board or elsewhere?
Many thanks in advance for your shared wisdom.
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