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No power to amplifier

Its a Sherwood sr-200 and one day i couldn't turn it on.
i replaced to power fuse and still nothing works.
p.s what does a channel fuse look like?

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Re: No power to amplifier

This unit does not have "output" fuses...accordianman

Posted on Jan 14, 2008

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I have a Sherwood audio/video stereo receiver S-277OR CP. Why would it work but not put any sound out?

Check speaker selection switch. If set properly then perhaps the amplifiers are blown - check for fuses that may be open.

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You will have to check the fuse.There probably is a fuse next to where the power cord goes into it. It will look like a little round black cap. It may be necessary to push on it and twist it in order to get it out. It will be marked on the case with a number followed by the letter "A", that being the fuse rating in amperes.

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bad fuse, something is sending it to sand by to keep from ruining the rest of it, have it looked at by a pro technician

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When powering up the Sherwood RVD-7090R Amp, it switches off again almost instantaniously.... Any suggestions ??

First of all remove all the speaker connections from the amplifier. After that power the amplifier and check that it gose to standby again ( protect show) or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier have some problem. there are five amplifiers in this AV receiver. This problem occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.

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I was looking for informations about the Sherwood AI-2110R and it seems to be an integrated stereo amplifier with good power. However the "external" plugs seem to deliver only the "passing" sound, what means that the signal needs to be powerd by an external amplifier. I don´t believe that a simple surround set would be able to do that. Maybe the best solution would be to hook another amplifier to the external plugs, via an "aux" connection.

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Try these simple trick to find out yor remote control working or not....
Point the remote control towards the Camera of a Mobile Camera phone,with the camera on. While pressing remote, we can see a light (Infra Red) coming from its IR LED through the Mobile Camera if the Remote is working.
If the remote is OK, then the problem with the Remote Sensor or related components of the receiver.

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The tuner shuts down when volume is increased. Probably a fuse but where are they lcated on the Sherwood RX4 103

it is not a fuse causing this. If a fuse was the cause, it would not turn on at all.

You may have a bad speaker, too many speakers, speakers connected wrong, a bad output channel in the amplifier, or even several other things.

let me know more details of how this is set up and how many speakers you are using, how many speakers per speaker jack, what type of speakers and the "ohms" rating on the back of the speakers where the wires connect into them and I may be able to help you figure this out.


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