Hi guys.
I try to fix this Marantz SR7200 that gives loud buzz noise in all modes. When switching a direct mode, sometimes noise disappears, sometimes not.
I will be glad for any suggestions.
Also, for some reason, access to "hifiengine" from my region is blocked. There is four service bulletins for this model which can help me, but I can't download it. If someone can help ;//
Marantz SR7200 Audio Video Surround Receiver Manual | HiFi Engine
Thanks in advance.
Cheers!
I try to fix this Marantz SR7200 that gives loud buzz noise in all modes. When switching a direct mode, sometimes noise disappears, sometimes not.
I will be glad for any suggestions.
Also, for some reason, access to "hifiengine" from my region is blocked. There is four service bulletins for this model which can help me, but I can't download it. If someone can help ;//
Marantz SR7200 Audio Video Surround Receiver Manual | HiFi Engine
Thanks in advance.
Cheers!
With whats happening in the world now a 403 ,while it might be a computer programming problem is in most cases telling you you are blocked from accessing the website because of the country you live in by your own ISP and /or government.
If that is really the case if I posted a link using my information I could end up banned from hi-fi engine as I know they want to know who you are and I have to disable some blockers to gain access .
As to your fault you have fully controlled large logic chip/chips conducting operations , in direct mode you are bypassing tone controls so first you could have a switch problem and/or a capacitor leakage problem.
As this might get involved maybe somebody here has worked on one and can give a more accurate assessment ?
If that is really the case if I posted a link using my information I could end up banned from hi-fi engine as I know they want to know who you are and I have to disable some blockers to gain access .
As to your fault you have fully controlled large logic chip/chips conducting operations , in direct mode you are bypassing tone controls so first you could have a switch problem and/or a capacitor leakage problem.
As this might get involved maybe somebody here has worked on one and can give a more accurate assessment ?
Still waiting for someone a good man, who will lose two minutes of his time to upload somewhere else these service bulletins.
The bulletins are attached but I can tell you none of them are relevant.
Do you mean a 60hz hum from the speakers or an actual buzz inside the case? The sharpness of the noise can help you determine far along the path it is.
Dollars to donuts it's probably the secondary power caps. Look for the second biggest pair of capacitors on the board. The main caps would cause a constant hum at any volume or input. Most of the sound processing caps would be all or nothing depending on the mode of the amp. However the secondary caps are stressed proportional to the amount of processing going on. Source-direct is the least stressful mode.
Do you mean a 60hz hum from the speakers or an actual buzz inside the case? The sharpness of the noise can help you determine far along the path it is.
Dollars to donuts it's probably the secondary power caps. Look for the second biggest pair of capacitors on the board. The main caps would cause a constant hum at any volume or input. Most of the sound processing caps would be all or nothing depending on the mode of the amp. However the secondary caps are stressed proportional to the amount of processing going on. Source-direct is the least stressful mode.
