Question about Audio Players & Recorders
Hello, immediately after powering up the receiver, the sound on both channels is being cut off for a short time, then comes again, is being cut off again, and so on for several times, accompanied by a soft rumbling noise, and after a while everything is fine for a quarter of an hour with normal sound quality, but then the procedure starts again. The sound level is rather low and the reception quality is perfect all the time. Any hints what to do? I am not an electrical engineer but able to change parts if informed in a reasonable way with not too much abbreviations I do not know ... Please help if you can. Thanks so much, Lisa
When the unit detects a problem, it shuts itself off to prevent any further damage. Your outputs (the IC's that give you sound) are most likely bad. You would need to know how to solder, etc. to replace them. Your best bet is to take to a repair shop if you can find one...
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Posted on Jan 02, 2017
SOURCE: Marantz SR 7200
It is likely that the PA stage has developed an offset voltage in the output stage. The faulty amplifier channel can be found by progressively disconnecting the collectors of the of the power transistors until the protection fault disappears. Once the faulty channel is found the the cause of the offset has to be traced to the faulty transistor or resistor. Don't forget that if you can smell smoke or burning then there are likely to be components(esp transistors) that have been damaged by the fault.
I had a Luxman unit that destroyed 5 transistors in the output stage that was due to an open .5W resistor in the driver stage.
Posted on Mar 29, 2009
There is a 1 Farad "super capacitor" that needs to be replaced. You need soldering skills to do it. The board is accessible if you remove the front panel of the receiver. The part # is DB-5R5D105; you can get them on eBay for about $2.00 each. Regarding the center channel issue, you may have a bad solder joint on the P781 connector on the P774 board. This is the board that houses the output transistors for the 3-channel main amp board (P704). If not these solder joints, you have a weak driver transistor on P704, and troubleshooting would probably be best left to a pro. Good luck!
Posted on Oct 18, 2009
I have this problem. it is caused by an o/c mains transformer primary winding. the clicking and flashing light is the stanbyy circuit trying to switch the power on to the main (large) transformer when it gets no voltage out it switches back off
Posted on Jan 29, 2010
my friend has the same problem with an SR 4001. the tech said it was an internal fuse soldered to the board. the display showed an error code that clued in the tech of the problem. I am trying to find the fuse on the board, and trying to get a value(Volts-amps) of the fuse
Posted on Jul 28, 2010
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