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Sherwood R-945 Receiver PROBLEM!

A

aaustins14

New Member
Hey all, New Here, New to working on receivers.

I have a Sherwood R-945 that will not produce sound expect for a tiny bit at Full volume.

It has done this intermittently but now its really broken. In the past i was able to turn it on/off/unplug/replug and get it to start working.

Now it turns on, looks normal/works normal, except it acts like it has no amplification. I have my phone connected through an Aux-rca cable and can only get sound at FULL volume - Even then it is a minuscule amount of sound.

It seems as if the startup muting isn't turning off after its powered on. (I'm referencing how the receiver bring the audio level down on startup so you don't blow stuff up) (I think thats how it works)

Any ideas? or advice? I consider myself above avg on electrical understanding but when I open this thing up there is a lot going on inside.

I appreciate any help!



A few answers to the maybe obvious questions:

Yes, I have checked the speaker on/off switch

Yes, I have tried other inputs.

Yes, The volume on my phone is turned up.

Yes, I have disconnected all speakers and connected them one by one.

Yes, I have tried different cables and different devices.
 
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Additions - I have found a schematic. ( A few pages earlier is the troubleshooting )
The troubleshoot guide says possibly a bad transistor or "Pulled out of correct speaker switchch" which I don't know what that means.

Also I cannot seem to find the listed transistors anywhere.

How would you go about testing a transistor? Would i have to remove it from the board, could it be tested on the board?
 
I'd clean the contacts and switches with contact cleaner. If you are in the US, home Depot has CRC, guitar center has deoxit, ...

Post your location may be helpful
 
Im in the US, Western NY state.

Call me dumb, where exactly are the contacts/switches? Like the volume knob? Sorry for the noob questions.

The receiver clicks as soon as I press the Power/Standby button. I do not hear a click after that. My onkyo clicks when i power on and then clicks again a few seconds later. Maybe you are on to something.

How to I test the protection or speaker relay?

Thanks guys I appreciate your time.
 
Having the same exact issue with my Sherwood Newcastle R-925. Do you ever fine the cause. The issue is in the amplifier section.
 
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