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Old 3rd June 2012, 05:23 PM   #1
diyAudio Member
Join Date: Mar 2012
Location: jacksonville FL
Exclamation should I buy this amp?

I am looking to get another Onkyo M-504...found one, but it has some issues looks great, everything comes on, except the meters do not light up green...dont kno if the lamps are just blown?... does not go into protect mode, but has no sound...
also from what this guy says is that the lanps hasnt worked in a while...and 1st one channel stoped working...but the other played for a while longer..then it stoped as well
Click the image to open in full is this something that can be costly to repair...if someone thinks its something not too much to have repaired($100 ish) but if its much will not be worth it! any help is greatly appreciated

Last edited by rselby; 3rd June 2012 at 05:35 PM.
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Old 3rd June 2012, 06:42 PM   #2
gootee is offline gootee  United States
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Join Date: Nov 2006
Location: Indiana
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If you were really lucky, it might be just fuses. Next-easiest would probably be electrolytic caps that have failed, or power rectifiers. Otherwise, unless you are very skilled at troubleshooting, and all of the transistors are still available (assuming it's not a tube amp), and you know what needs to be matched among them, and how to do it, and you have the equipment, I'd look for a different one.

The meter lighting is probably just burned-out bulbs.
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Old 3rd June 2012, 07:17 PM   #3
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Join Date: Mar 2012
Location: jacksonville FL
fuses i can do...caps...can probrbly do...the rest would have to take it someone for repair..never had anything have no idea how much it is
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Old 3rd June 2012, 09:15 PM   #4
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Join Date: Nov 2004
Location: Germany
Buying broken amps always is a bit of a risky business.

If you're lucky, it's just the protection power supply smoothing cap (C708 - 2200/16V, 25+V wouldn't hurt in that spot) that's shorted out and taken the corresponding fuse (F702) with it. At least that would cause the mentioned symptoms, including missing VU meter lighting. The missing channel would be ordinary speaker selector or protection relay contact isues.

If you're less lucky, you've got a fault in the power amp.

At least the service manual is easily available on the web.
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