Sorry in advance for the wordiness it is something I am working on but not right now.
I inherited an old Marantz SR-3500 receiver from my uncle when he passed, he was an electrical engineer who came up from nothing in Italy, and came to America to become a mover and shaker in the Silicon Valley. He became very successful, and passed on his success to me as a child by teaching me how to solder and the basics of electronics. I am now an electrical engineer because of him. I have had this old receiver from him in storage for a while because while it I knew it wasn't working and needed repair, I was pretty transient and also couldn't bring myself to look at it.
I have it out in my lab now, and got it hooked up to some older Infinity speakers that I trust (8 ohm impedance which is what the unit likes). When it works, I think it sounds great, and would like to give it some TLC and use it to rock out while I work on projects.
Keeping in mind it has done these things since before I put the unit into storage, it was never stored anywhere cold or hot, it has been at normal household temperatures and humidity, it has a couple issues that stand out right now:
A service manual would be great, as it would help me bring everything within spec. I scoured the internet and I tried the usual channels to no avail. I even looked for a similar model (SR-3300 is a close match, just slightly less featured, so I think it might be a good start for me if someone has that service manual) and cannot find anything there. Marantz does not want to or cannot find one to part with, and one of the multitude of authorized service centers I called said they had the service manual, but can't share it, which I find ridiculous for a piece of equipment older than I am.
I really am in need of some guidance here, I am making a lot of assumptions about how this receiver operates. I believe I am one step short of reverse-engineering it, which I loathe the idea of doing for something that someone else has already painstakingly designed. I have a full lab: oscilloscopes, power supplies, function generators, meters, etc... I would like to start with asking if anyone has had these problems, or could help me make solving it easier. I know some folks have said that this stereo sucks and to junk it, but I wish to listen to music with it.
I inherited an old Marantz SR-3500 receiver from my uncle when he passed, he was an electrical engineer who came up from nothing in Italy, and came to America to become a mover and shaker in the Silicon Valley. He became very successful, and passed on his success to me as a child by teaching me how to solder and the basics of electronics. I am now an electrical engineer because of him. I have had this old receiver from him in storage for a while because while it I knew it wasn't working and needed repair, I was pretty transient and also couldn't bring myself to look at it.
I have it out in my lab now, and got it hooked up to some older Infinity speakers that I trust (8 ohm impedance which is what the unit likes). When it works, I think it sounds great, and would like to give it some TLC and use it to rock out while I work on projects.
Keeping in mind it has done these things since before I put the unit into storage, it was never stored anywhere cold or hot, it has been at normal household temperatures and humidity, it has a couple issues that stand out right now:
- Right channel (and sometimes the left) likes to cut out. I can bring the channel back (Most of the time) by quickly rotating the volume knob up and down repeatedly. Sometimes this is not a reliable method. I do not think this is a dirty potentiometer, but I could be wrong. This happens on both channel A or channel B
- After playing music or an audiobook or whatever for a bit, it develops this whine. My audiotool app with my calibrated dayton mic is putting it at somewhere in the 18-20khz range, but it is very quiet. Only enough to be irritating. It is times like this I wish I was deaf to this portion of the spectrum, but it does help with diagnosing other problems. This also happens on both channel A and channel B.
A service manual would be great, as it would help me bring everything within spec. I scoured the internet and I tried the usual channels to no avail. I even looked for a similar model (SR-3300 is a close match, just slightly less featured, so I think it might be a good start for me if someone has that service manual) and cannot find anything there. Marantz does not want to or cannot find one to part with, and one of the multitude of authorized service centers I called said they had the service manual, but can't share it, which I find ridiculous for a piece of equipment older than I am.
I really am in need of some guidance here, I am making a lot of assumptions about how this receiver operates. I believe I am one step short of reverse-engineering it, which I loathe the idea of doing for something that someone else has already painstakingly designed. I have a full lab: oscilloscopes, power supplies, function generators, meters, etc... I would like to start with asking if anyone has had these problems, or could help me make solving it easier. I know some folks have said that this stereo sucks and to junk it, but I wish to listen to music with it.
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