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My Sherwood RX4209 will only stay on for 3 seconds then switches off and goes back into standby

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Posted on Jan 02, 2017

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SOURCE: My Sherwood RD6405 Switches on

Hi hyphen

Try a hard reset first. switch the amp off overnight and try it in the morning. If problems persist, is it covered with warranty from where you bought it? Best to go that route if it is. If not, get back to me here.


Posted on Mar 19, 2008

  • 1148 Answers

SOURCE: Sherwood RV-8070R, i can t switch it on


Posted on May 15, 2009

  • 2098 Answers

SOURCE: The problem I ran into

Hi amit2817,
Your unit gone to overload that caused the subsequent shutdown. To isolate the input and speakers from fault, disconnect all input cables and speaker wire from the unit then turn it on naked. If the symptom still there then this is a clear indication that the fault came from the unit itself. Most common caused of this problem is the sound output circuitry and the power supply. Most common affected parts in the output section is the output IC/transistor(mounted in the large heat sink). It will fail because of exposure to excessive heat due to frequent high volume and or because of aging. Bad solder joints is also to consider to this section and also to the power supply section. Because of heat build up, most of the joints dried resulting to poor flow of the supply and trigger the over current(overload) protection circuit. Leaky electrolytic filter capacitor is also one of the factor in this fault. It will produce an out-of-regulation to the power supply output. You must have a capacitor checker to determine its condition. Sometimes it has a bulged/dome at the top but not all.
If you don't have necessary tools and test instrument and can't troubleshoot the symptom, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Posted on Apr 02, 2011

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My Sherwood RD6405 Switches on for about 5 seconds from standby when you choose an input source but then goes back to standby. It has only had about 12 hours use in total.

Hi hyphen

Try a hard reset first. switch the amp off overnight and try it in the morning. If problems persist, is it covered with warranty from where you bought it? Best to go that route if it is. If not, get back to me here.


Mar 19, 2008 | Audio Players & Recorders

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