I am trying to see if I might be able to solve a problem I have with my AV2 Processor which I only use in multichannel (so as an 8 channel pre-amp)
I am finding there is some digital noise (digital buzzing bee sound) that comes in after 3-4 minutes of play or straight away. When I switch between inputs and then back to multichannel it usually goes, but only to re-occur after a few minutes. It's also having problems locking on to selections as well and you can sometimes find a pause as you hear the relays ticking.
I am very happy with the sound of this processor and have upgraded a fair bit on the analogue power supply over the years.
Be amazing if anyone has any suggestions where to look. Interestingly when I choose a digital input (optical) when it locks on this is noisy the same noise as the erratic digital noise on multichannel but louder. Usually when then choosing direct (2 channel) it goes and then back to multichannel gone but then drifts back. The Noise is on all 8 channels
Any ideas ?
I am finding there is some digital noise (digital buzzing bee sound) that comes in after 3-4 minutes of play or straight away. When I switch between inputs and then back to multichannel it usually goes, but only to re-occur after a few minutes. It's also having problems locking on to selections as well and you can sometimes find a pause as you hear the relays ticking.
I am very happy with the sound of this processor and have upgraded a fair bit on the analogue power supply over the years.
Be amazing if anyone has any suggestions where to look. Interestingly when I choose a digital input (optical) when it locks on this is noisy the same noise as the erratic digital noise on multichannel but louder. Usually when then choosing direct (2 channel) it goes and then back to multichannel gone but then drifts back. The Noise is on all 8 channels
Any ideas ?
I stripped the unit again and carefully checked, cleaned and made sure there was nothing obvious. Back together it is as before, I spent more time experimenting and I am really confused why changing to optical and back to Multichannel removes the noise, but it will then come back sometime in 5 or 10 seconds other times 2-3 minutes before it comes comes back. When it does come back it's very quick and usually instantaneous - bizarre. when it's back it wont go unless you go through the input and go to optical.
Every time I can get it quiet again by choosing optical, then back to direct or multichannel, only to wait between 5 seconds to 3+ minutes and it re-appears with no change made. The digital high pitched noise is independent of volume and the same muted and even put in standby (Power amplifiers on)
Be great if anyone has any suggestions ?
Every time I can get it quiet again by choosing optical, then back to direct or multichannel, only to wait between 5 seconds to 3+ minutes and it re-appears with no change made. The digital high pitched noise is independent of volume and the same muted and even put in standby (Power amplifiers on)
Be great if anyone has any suggestions ?
Unless you have a schematic its pretty hard to say. You could look for things like bulging electrolytic caps, corrosion, bad connections, cracked solder joints (may need a magnifying glass), etc. Other than that, maybe its time has come?
Mark, tks
I dont have a schematic and have managed to track the signal and analogue power supply for the audio section but that was heaps of work and I have to make some assumptions with multiplexers. The tracks flip over and back, many, many times and some chips cover tracks, so tough for me to do. I have tried to see which is the 'switch' and this is a good example of some of the underside IC's some I know what they do but not how there function fits into the chain and others are covered with paint and I can't locate the part number. I dont think if I did locate all the parts and follow the tracks I would be able to understand the logic, way beyond me.
It's the intrigue that changing the function solves the noise but only for a short and inconsistent time
I dont have a schematic and have managed to track the signal and analogue power supply for the audio section but that was heaps of work and I have to make some assumptions with multiplexers. The tracks flip over and back, many, many times and some chips cover tracks, so tough for me to do. I have tried to see which is the 'switch' and this is a good example of some of the underside IC's some I know what they do but not how there function fits into the chain and others are covered with paint and I can't locate the part number. I dont think if I did locate all the parts and follow the tracks I would be able to understand the logic, way beyond me.
It's the intrigue that changing the function solves the noise but only for a short and inconsistent time