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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Static in left channel on vintage Marantz 2240 Receiver
I finally got the part that was faltering on my Marantz to kick out.
The reason the 2240 got shelved a few years back was because the left channel cut out. I pulled it out this summer, gave it a good cleaning, got rid of the noise on the controls, and set it as my main reciever (replacing a low-end 1997 Kenwood). However, I knew that the fact that it was working was too good to be true--and I was right. Before today, I would experience small amounts (about 10 seconds or so) of a scratchy noise every 6 hours or so that the receiver was operating. Now, there is almost constant static. It's always in the left channel, it's unresponsive to the balance setting (it still exists if I set it to extreme right), it occurs on the main speakers, remote speakers, and the headphones, and it's enough to cause the Marantz's speaker protection relay to kick in. I'm assuming that the problem is somewhere in the left channel amplifier--but I'd like suggestions for a starting point. (I do have a schematic handy--but I'd need to find a scanner to get it online.) Thanks in advance, --Chris |
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Static in left channel on vintage Marantz 2240 Receiver
In article , remove wrote:
Beanie wrote: I finally got the part that was faltering on my Marantz to kick out. The reason the 2240 got shelved a few years back was because the left channel cut out. I pulled it out this summer, gave it a good cleaning, got rid of the noise on the controls, and set it as my main Determine if its just the power amp or preamp. Disconnect the preout / amp in, and listen. Sounds like the amp from your details. reciever (replacing a low-end 1997 Kenwood). However, I knew that the fact that it was working was too good to be true--and I was right. Before today, I would experience small amounts (about 10 seconds or so) of a scratchy noise every 6 hours or so that the receiver was operating. Now, there is almost constant static. It's always in the left channel, it's unresponsive to the balance setting (it still exists if I set it to extreme right), it occurs on the main speakers, remote speakers, and the headphones, and it's enough to cause the Marantz's speaker protection relay to kick in. I'm assuming that the problem is somewhere in the left channel amplifier--but I'd like suggestions for a starting point. (I do have a schematic handy--but I'd need to find a scanner to get it online.) Thanks in advance, --Chris Press the tape monitor switch in and out for a minute or so. Noise change? Common problem. BOB -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =----- |
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