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How do i fix my home stereo amp

Hi guys I have a marantz pm493 home stereo amp, I know it's old but is still an awesome amplifier. The problem I have is after a minute or two of Turing it on it shuts off, for about 15-20 seconds then turns on by itself, then off again 30 odd seconds later and so on and so on. Is this a simple cheap fix or should I just throw it away??

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  • 528 Answers

There are a few things that could cause this to happen - but you'd need more electronics savvy and equipment to repair. Since things are made so poorly these days, you'd be better off taking it to a Stereo/ electronics Wizard for repair. Fixing it will bring you many more years of service, whereas throwing it away will doom you to usingthe modern poopie available. Have the Wizard do a tune up on it too - it could be just accumulated dust, an overloading capacitor, etc. I personally would first open it up and look it over closely with a magnifying glass, watching for burnt /blackened spots, heavy dust, smelling for burned electrical ( very unique smell). If you find heavy dust/dirt, you can use some electrical parts spray from your local auto parts store to clean ( use a solder flux brush to scrub stubborn or hard to reach parts). If that doesn't cure it, I'd take it to the Wiz and let him work his talents on it.
Hope this helps and thanks for using Fixya!!

Posted on Nov 28, 2013

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Sounds like an easy repair. My advice : bad capacitor

good luck!

Posted on Nov 28, 2013

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Posted on Jan 02, 2017

SOURCE: Marantz SR8500

Check the settings on your dvd player!. It might be set to PCM
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Posted on Mar 10, 2008

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SOURCE: set keeps shutting down

It could be that the amp's overload protection circuit is being triggered by a feedback loop or other problem, such as a shorted or bad cable connection. Turn off the power and unplug the receiver. Look for problems, starting with shorted speaker wires or cables. Then make sure the receiver's not still hot (wait 5-10 minutes to let it cool), and remove obstructions or anything blocking the top vents. Plug it back in and power up again. Immediately change the Source selector to something unconnected, and turn the Volume DOWN just in case there's a feedback loop (hum/squeal/noise that can overload things and cause the protection circuit to trip again). If you can see the display, go to a low level (around -50dB should be fine) before the delayed speaker amp output clicks on. Then carefully switch back to the problem source -- if that's the problem, switch off again immediately and re-check all of the cable connections at both ends, the receiver and the source component.
Make sure you don't have a feedback loop due to a recording device feeding back a signal. All VCRs and CD/DVD-recorders should be hooked up to the VCR, DVR or TAPE/CD-R "IN/OUT" jacks with IN being connected to the cables marked OUT on the deck and vice versa. (That confuses even us experienced guys sometimes!)
Also, no MONITOR video or audio outputs should be connected to the recording decks, nor should the TV outputs be fed back to the recorders. The same goes for the digital IN/OUT jacks for CD recorders; use only the same number IN as OUT for each component (For example, Optical IN/OUT #4 and #5 are the two digital IN/OUT pairs on the Denon AVR-380X series.)

Posted on Jan 28, 2010

smarthome2
  • 1114 Answers

SOURCE: I have a Sony STR-DE597

The most common problem found on FixYa for Audio Video Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

Posted on Jan 14, 2011

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