20 Most Recent Marantz SR-7400 Receiver Questions & Answers


The power supply may have failed without any symptoms.

Marantz SR-7400... | Answered on Feb 13, 2019


I have a POW 5 failure on a marantz sr 7500. Anybody know how to fix?

Marantz SR-7400... | Answered on Jan 23, 2014


Which model cable box do you have?

Marantz SR-7400... | Answered on Dec 27, 2010


Protect means that there's a short on one of the amplifiers - the fact that is extremely hot is not helping, it shows the short is still acting and doing more damage as we speak.
Put the volume at 0, close the amp , take out all the speakers and wait for it to cool down then start it again - if the message is still there then one of the amplifiers is shorted and must be replaced (this is a major failure - let it to a trained repairman). If the message isn't there then one of the speakers is shorted - close the amp and connect them one at the time till the message reappears then junk the respective speaker and replace it with a similar one (make sure the replacement speaker has the exact same impedance)

Marantz SR-7400... | Answered on Jun 13, 2010


Most likely you have a speaker short, you need to check the ohms on each speaker disconnected from receiver if they are 8 ohms they should be close to that on the meter no more than a 1 and half ohm varience to what the speaker ohms says on the back. If they are ok you need to disconnect speaker wire from receiver and check for a short in the wire by connecting ohm meter leads to ends of the speaker wire you should get no reading if the wire is good. If this is all good you have a bad output transister in your receiver, but i dout this is the case because these transisters normally short to ground and blow a fuse. Hope you solve your problem good luck

Marantz SR-7400... | Answered on May 24, 2010


Unplug the unit. Carefully unscrew the screws for the case. Probably 4 screws, 2 on each side of the unit. Remove the cover. Look for the fuses, and replace with exact same type/specs of the faulty fuse. If the fuse, is on a printed circuit board, be careful dislodging the fuse. Hope this helps.

Marantz SR-7400... | Answered on Apr 07, 2010


try to unplug it 30 seconds and plug it back in if that doesnt work it may be a fuse or something on the mother board that needs to be look at by a professional manufacter technician.

Marantz SR-7400... | Answered on Aug 15, 2009


Hi 3303k

Strange dramas you are having there. I would suggest first, that you switch the unit off overnight(unplug at the wall) to allow for a fulll hard reset. Then fire it up in the morning again, and see if it behaves itself. I found a user manual for you online here

It is a good amp that you have, and hopefully resetting it will sort it out for you. If not, please do get back to me here and we shall look deeper..

Thanks for using FixYa, a FixYa rating would be great for looking into this for you. Happy to help further :)

regards
robotek

Marantz SR-7400... | Answered on Jun 05, 2008


Try to use different discs. Older unit may have problem writing high speed discs. Try to find 1x or 2x discs. OPC-optical power calibration. Another possibility that yourlaser is on the way out

Marantz Audio... | Answered on Aug 02, 2020


Check to make sure your speakers are in phase. This means that they are both wired the same way. Common problem, and can damage your amplifier if not changed. Positive and Negative must be the same on all speakers.

Marantz Audio... | Answered on Jun 25, 2020


You have a piece missing. I would guess a thin wavy washer on the base of the platter and spindle.

Marantz Audio... | Answered on Jun 24, 2020


Unless you have extensive knowledge of electronics and the equipment necessary to troubleshoot the issue, I would look for a reputable repair center. The unit has components inside that eventually fail.

Marantz Audio... | Answered on Apr 26, 2020


https://audiokarma.org/forums/index.php?threads/marantz-sr7000-increasing-bass-w-o-remote.504810/

Marantz Audio... | Answered on Apr 06, 2020

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