Question about Sherwood RD-6500 Receiver

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Home theater system protection kicks out

Bought a Sherwood RD-8601 receiver and have problems with it kicking out instantly. Noticed speaker outputs indicate "6 ohms". I have remnants of an old KLH A/V speaker set and 4 advent satellite speakers. I have measured the them with the following results .... my RF,LF,RR,LR and CTR are 8 ohm speakers. The sub woofer has 2 channels, each with its own 4 ohm driver and is driven by the same receiver outputs that drive each front speaker through a cross-over(or some kind of circuit) in the sub. I believe this was the original sub-woofer setup and is still used when there are not sub-woofer outputs on the receiver being used.The sub-woofer appears to look like 4 ohms to the receiver. I can't see the 8 ohm load causing the receiver to kick out as there would be less current generated (than 6 ohms) so if the speakers are causing a kick-out the 4 ohms on the sub must be doing it. I feel if I change the sub-woofer drivers to 8 ohm I may solve the problem and would like any input on whether this is a good idea. I hate to buy a whole new speaker set for nothing and have my eyeball on 2 nice KEF 8 ohm drivers that will fit perfectly in the sub-woofer box. Thanks for any input.
Keith

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  • Sherwood Master
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I assume you have no sub-out, or even if you do, you are not using it. The type of subwoofer you are mentioning is very old, but still useful. I'm going to take a guess that you have the subwoofer connected to the same speaker terminals as another speaker. With your 4ohm load from the sub, connected with another speaker, the load your amplifier is seeing is now less than 4ohms. With these old subs, you run the speaker outputs from the left(or front left) to the sub where is says from amp. There will be another set of connections that say satellite(or to speakers). In this configuration, your amp will see only the impedance of those front speakers. Try this ASAP, before you blow your amp up. If you require more assistance, please visit my website at audioserviceclinic.com. Thank you.

Posted on Dec 20, 2014

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  • Master
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Nice write-up.

http://www.sherwoodusa.com/pdf/RD-6500(English).pdf

On page 6 of the manual it states you should use a powered subwoofer and the unit provides a sub output on the rear panel for it. The message from the amp kicking out is that you're not going to get away with your workaround.

I would advise you to purchase a nice amplifier (2-channel bridgeable or single channel) for the subwoofer. That way you'd be sending only LFE signals and your receiver has provisions for adjusting its volume relative to the rest of the channels. I use a nice 5-channel Carver for my 3 subs and both Rear Surrounds.

On eBay I see what I would get if I were you - a Carver M-200T (120W x2; 300W bridged). I have one.

http://cgi.ebay.com/Carver-Magnetic-Field-Power-Amplifier-M-200t-120WPC-Amp_W0QQitemZ200327110781QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item200327110781&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A1%7C39%3A1%7C240%3A1318

Posted on Apr 04, 2009

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1 Answer

Shut up stereo protect mode?


Protect mode is on because something in your speaker wiring is wrong, or you have a broken speaker, or it\'s too late and you already fried one or more of the amp\'s output transistors.



You gotta fix the problem. Not remove the safety guard and carry on with a busted machine.



Look for wires touching between the speaker terminals or on the backs of the speakers. If you done a half-ass job of wiring up then this is the most likely cause.



If you can\'t find bad/frayed wiring, then disconnect all the speakers out the back of the amp. Switch the amp on. Does it trip out? If no, that\'s good. Turn up the volume. Is it still okay? If yes, that\'s good. You haven\'t yet killed the output transistors. If it goes in to protect though, ut oh. It\'s Repair Shop Time.



If the amp is okay, then power off and add one speaker. Power on with the volume down. If it trips either at no volume or when you increase the sound, then you got a bad speaker and you just found it. Repeat the process, adding one speaker at a time. Make sure you put Vol to minimum and power off each time before adding the next speaker.

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RD-6506 sherwood back to standby mode after 3 second when attemting to operate the system, any help please.thanks and God bless


Hi,Need more info. Was the unit working then failed? tell me anything you noticed, this sounds like a fault in the audio output or power supply stages,I have had other receivers do this for variou reasons

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Sherwood rd8601 When you turn the receiver on, it automatically turns itself off, will not stay on.


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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I have a Sherwood Audio/Video Receiver Model RD-6105 that keeps cutting off after 30 sec in use i had it for about 2 years can you tell me what's wrong or how to fix this ?


Generally speaking, an amp protects itself from heat, shorts and overloads.


Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

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Without speakers hooked up when you turn it on it kicks off within a few seconds what should i do to fix the problen


You didn't mention this but I assume it was working with speakers and then failed? If so, then a module near the output has probably failed and the power supply is shutting down for protection. Without a simple multimeter and a little knowledge you probably won't be able to repair this yourself.

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Sherwood RD-7502 Hdmi Audio Problem


if you have a tv with outputs you can connect audio wires from your tv output to your audio receiver input and you will have surround sound for everything connected to your tv

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I have a sherwood RD-6108 receiver that shuts off after 30 sec. of use


This is the overload protection circuit. Make sure not alot of dust build up inside and make sure no speaker connections are touching. Most likely being that it a sherwood you will want to consider replacement.
Thank you,
Lee

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No home theater sound


Protect mode will kick in whenever a fault is detected.

You get the unit not powering up, and sometimes you hear a clicking noise, that is the protection switch that keeps shutting down the unit.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

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The dvr99 3 dvd home theater receiver will not stay on


Protect kicks on commonly when it over heats or when the speaker wires are crossed and it detects a short on the output. Your symptom sounds as though it may be a speaker wire because it happens right after the power is turned on. Check the speaker wire carefully, it has a habit of breaking inside the connectors of both the receiver and the speakers, especially after 5 years of service.

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