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Sherwood AX4103 Amplifier Problem

I recently came about a Sherwood amplifier. Problem is, it powers up fine, display works and all, but there is no sound comign through. Volume knob works fine, and as far as i can see the wiring is solid. I've connected it to two crappy speakers, but nothing using the auxillary input. Any help or info greatfully recieved.

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  • Anonymous Sep 26, 2008

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NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.


Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

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I have a Sherwood Nottingham R-925RDS receiver. No matter what input I select it does not connect to the amplifier section. Everything else appears to function ok. Unit switches on & off, correct...


Let's work with FM as that is ONboard and can't be connected wrong. Does THAT work?

Turn the volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

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1 Answer

Hi i am bejoy . i have a very old Sherwood AM-8500G Power Amplifier .it repaired recently . and the mosfet of the amp got burnt .. it is j162 . is there any alternaive transistor for that . cos this is...


Don't know where you got the idea it's not available because it is on this website below and others:
www.electronic-spare-parts.com/.../2sj_162.html
Perhaps you didn't know that many electronics products from Japan you have to add 2S to the front?

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1 Answer

Not powering up ..... will turn on but after what appears to be some internal check it shuts down. Sherwood amplifier.


Disconnect all inputs, then add one at a time to see what happens. If that doesn't work, disconnect all speakers, then add one at a time.

You may have a short-circuit in one of your inputs or speakers, and the amp is detecting this.

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1 Answer

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Something doesn't sound right. The standby circuit is usually very simple. The "regulator" is just a transistor. Can you request and post the parts that he/she can't find. I should be able to get you a source or substitutes.

Dan

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2 Answers

Searching for manual


Go to http;//audio,manualsonline.com

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if your skilled enough,concentrate only on the power supply circuit and try to check some chips,if not see a qualified tech.

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