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My sherwood RX-4209 switches off after 5 seconds and goes back into standby mode

As explained above

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Posted on Jan 02, 2017

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SOURCE: startup

Going into protect due to either blown channel or probably a 15v regulator might be down which I have seen many times also. causing unit to go into protect.

Posted on Jan 31, 2008

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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

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


Posted on May 15, 2009

Bulldog AV
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SOURCE: after turning ON the power/standby switch, the

Is the red light flashing at first?
The unit may be going into protect mode. Lets hope it has done the job and the receiver has protected itself from failure.
Protect mode can result from speaker wires touching each other or the Amps2_bing.gif metal case. Check that first.
It can also be caused by unstable ohm loads if too many speakers2_bing.gif are connected to any of the outputs especially zone 2.
If you can remove all speaker wires and turn the unit back on. If it stays on, turn the volume down on the main zone and zone 2 if connected. Then reconnect speaker wires.

Posted on Nov 24, 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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