My amp works perfectly but when it starts to reach above average volume it cuts out to mute and will only work when i turn it off and on again before cutting again when reaching that same volume. My speakers and CD player both work prefectly when tested with another amp. Is this repairable?
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Re: Marantz PM4000 amp keeps cutting out
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The user manual is here;
and your nearest service centre is here;
Unit 7 Bentinck Court, Bentinck Road
UB7 7RQ West Drayton, Middlesex
E-mail : [email protected]
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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.
Some amps have a button which you press to mute the speakers when the headphones are plugged in. Sometimes marked "Speakers on off". If it hasn't then a new headphone socket would not be expensive to fit. As long as the amp producers sound I don't see any future problems. The previous owner may have used the headphone socket a lot, and simply wore it out!
What's probably happening is that the amplifier is shutting down or cutting back the volume as protection from damage. You may have a partial short in the speaker wiring that is not a problem at lower levels, but at higher ones causes the amp to see too low a load. There may a problem with a speaker or crossover component that is breaking down at higher volumes. Or something in the amp's output stage is unable to handle the load.
Test the system with a known good speaker system and length of wire and see if the trouble continues. If it does, you'll know it's the amplifier that needs to be checked. If the test speakers can reach normal volume, you can start checking the wiring and other speakers for the source of the trouble.
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.
Did you try all the codes listed. Some work certain functions such as power but not volume. Did the installer leave a phone number where he could be reached other than directv toll free number? Did you receive the same remote as the original. Directv has two remote that are identical in appearance but one is rf capable and the other is infared. The RF remote has backlit keys and is compatible with just about any device.