Hi Strange problem with Marantz pm7001 When ever I turn the volume upto around 1/3 and 1/2 of the way, the amp cuts out and reset it self down to minimum volume. It seems like the amp ins't enough power to push the speakers.

If the device works on other speakers then it is probably working as it should. You need to check if the is an issue with the speakers that cause it to cut out. Make certain they are the right Ohms for the Marantz. Check the connections to them. It could be that a safety device is clicking in to protect them amp due to some overload problem, caused by the speakers themselves. It might even be one speaker that is playing up. Try testing one speaker at a time, by not having the other connected and the balance control only to the one connected.

It sounds like a shorted speaker or to many on one channel. It could also be a failed output device. I think the tic-tic is the overload safety cycling.

Most likely, your unit is shutting down due to overheating. You cannot run an amp at that kind of volume very long. It is shutting down to protect itself. Try running the amp at 1/3 your normal level. Most likely, it will not shut down.

Do you mean "db"?

NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING. 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.

Turn the volume down.

While you're squinting at the front panel, find the manual and evaluate every indicator on the face to make sure you understand what they mean and how they might affect operations. Look for Speakers NOT enabled, Muting ON, a Tape or other input inadvertantly selected. If you fail to find the errant setting, treat it like a new install and set it up all over again according to the manual.

Or it could be you're overdriving it, hence the heat. Take a clue and turn it down. At 70 wpc played loudly it could be going into speaker- and self-damaging distortion.

Make sure it has a lot of ventilation.

A couple of questions to try and narrow this down:

1) What is the impedence rating for the speakers?

2) When the unit shuts down, will it recover on its own after a little while or do you need to power cycle it to get it to work again?

3) When the unit shuts down, is it hot?

Possible causes of this behavior:

1) Impedence rating too low causing the amp to work too hard and shutdown.

2) Excessive heat (caused by #1?) will shutdown the unit to prevent damage.

3) Possible intermittant short in the speaker wires somewhere? Loose connection?

A little more investigation will be required to find this. A repair shop would run this unit under load and monitor the outputs for heat and any spikes in the signal that could kick in the protection circuits.

Keep us posted on what you find.

Dan

May be the problem solved here :
http://www.audiotoolers.com/ubbt/ubbthreads.php/ubb/showflat/Number/5316/page/1#Post5316

Hi , you need to replace with thick wire , if possible attache fuse or circuit trip overload protection you may ask to thew radio store .

not enough power to amp and or amps location is too hot might want to invest in a couple cooling fans from computer store and attach where needed

an amp should take up to 3/4 load but when not enough air to it to cool it off it will shut down

try this turn gain all the way down and slowly work up too desired amp volume setting

There is a fairly simple fix to this problem here: http://www.audiotoolers.com/ubbt/ubbthreads.php/topics/5316/Problems_with_Marantz_PM4000_A.html