Question about Marantz SR-18EX Receiver
My 6 year-old receiver is making crackling/static/buzzy noises from the front left channel. I've double-checked all the connections. It does it regardless of the source; TV, radio, CD, DVD. I've switch speaker wires, so I know it's not the speaker (wish it was).
I'm wondering if this is common to this receiver, and if there's a repair that is the usual culprit, rather than spending tons of time and money tracking down the problem.
Also, are there any recommended service shops?
Peter in Milwaukee
The f-l channel of the sr18, & sr18ex & sr19 is a common failure location due to the heating and cooling over the years. The crackling an/or distortion, is most commonly due to the amplifier going into a high idle, or d.c. offset that can no longer be controlled by the adjustment potentiometers on the board. usually the two 2sc3200 transistors become unstable, and as well a 47mfd and a 470 mfd elect. caps nearby. Also distortion is caused by one or more of the zener and germanium diodes all grouped near the big dual ceramic white resistor. The amp block is held in by six screws. first remove the cross bracket, then cut the cable tie free from the hole on the board. Ten screws hold the top board on, the pull the boards apart from the connectors. before replacing it, resolder ALL of the connector pins to BOTH boards.
Posted on May 27, 2009
From the problems listed by you, I think there is some leakage on the power board.
But before we do further trouble shooting, please do check your speaker cabling again. Make sure that all of them are seated properly, none is touching each other or the body of receiver. Take out all the wire and put them back again if necessary..
Are you using banana plugs for connecting speaker or just directly. Some times even a little tiny frayed wire touching the receiver could trigger the protect mode or have that cracking noise. Be careful, since protect mode is sometimes not fast enough and it could blown a few trasistors in the power circuit.
If everything else seems all right and still your receiver is making the static noise then it possible that there are bad connections on the main board that are set in. This would generally happen if the system is slighly old or have dry solder. This should be a simple repair that may not require parts or maybe just the change of some capacitors.
If you can solder, you will be able to repair this yourself, I could guide you further. If not, then a local service center will change the local labor rate. Let me know if I can guide you further.
Best of luck! Thanks for using FixYa!
Posted on Apr 20, 2009
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Posted on Jan 02, 2017
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