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Marantz AC 500U

From 5 amplifiers only 2 are going to protection mode, 3 other are OK. However, since the 1-st amp starts clicking (protection mode) I had to reduce volume on the preamp from 12 to 9. Then it is not clicking but sound is not loud. I got another amp and conected to this preamp and it did not change anything. I also replaced 2 Niles volume controls for 2 rooms connected to this amp (Sonance SONAMP 260x3). It looks to me that Marantz preamp provides now different output for the amp, maybe to strong so that amp goes to prevent when I keep volume on the preamp in the same position which I had for 12 years without any problem. I used entire system for 12 years, but only once every 2 weeks or once a month for 5 hours and on 40% volume on volume controls. I think that recently something happended to the preamp that also damaged 2 volume controls. I stoped having a sound on 1 pair of speakers and had to replace volume controls on the wall. I understand that amp will go to prevent mode to safe amp, but that clicking could damage the Niles volume control. When amp goes to prevent mode it does to safe amp, but not the volume controls on walls or speakers. THAT'S MY UNDERSTANDING. AM I CORRECT RE THOUGHTS??? I have Ph.D in mechanical engineering but do not know much about audio equipment. Now I am testing the system with 1 amp contected to preamp, I disconected 4 other amps to investigate my problem. Am I doing right thing and and again am I correct re my thoughts what's wrong with my system??? I know (from manual) that preamp should provide on output 1V/600 ohm, could these parameters change with time or for any other reason??? I would appreciate your advise...Andrew

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Hi

Sorry for the delay in getting back to you, you have an odd problem happening there, the pre-amp being the common denominator to the syptoms. Perhaps you could try reducing the attenuators to say 60% and retry at the same levels you used to use at the preamp. It is unlikely that there is a fault occurring that would increase the output of the preamp, more likely to be a DC component getting through. It could also be possible that the amps if all the same make and model have through over the period of installation developed the same fault.
There will have to be a common contributor to the symptoms. It is not uncommon for the same problem to affect a particular model at the same point of its life. Best approach and easiest to fault find it would be to change out the preamp with something similer to test the system and see what happens. At least tyouy will know where to start looking. Hope I have been able to help you, still happy to discuss it further. In the Free section our only reward is a FixYa ratings. Cheers

robotek

Posted on Jul 24, 2008

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Thankyou for the detailed fault description..it really helps!

sounds like there is one of these 3 things wrong:

1. leaky or partially blown mosfets on ouput power stage of amplifier are leaking DC onto speaker output causing amp to go into protect..this explains any banging or clicking herd.

2. There has been damage to the internal SMPS and is going into protect because of an internal rail over-voltage/under-voltage.

or 3. you have a shorted speaker lead or sub that is bringing the amplifiers load down to less than 2 ohms..buy or obtain a multimeter and have a poke around and check all your speaker leads on the ohm setting anything lower than 1.6 ohms and you have a short...also make sure that you have correctly loaded amplifier to..alot of begginer audio enthusiats overlook this important step and cook amplifiers!!

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