Marantz pm 325....power light comes on, but that's all that happens when turned on.. thanks, Rod.

SOURCE: marantz pm 7200

Could be a power supply failure or a Power "On" switch failure.

Kev

Christophe Thompson

• 1224 Answers
• Posted on May 07, 2008

SOURCE: amplifier power cutting out

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

SOURCE: marantz PM-74D

Your no doubt finding the speaker safety/turn on surge protect relay NOT engaging a few seconds after turning it on-right? Check the output transistors. These are the big green and black ones screwed to the heatsink. You gain access to them by taking off the bottom cover. There's 4 per channel--2 green and 2 black. You'll probably find one or more of them shorted. If you find replacements, put them in exactly as the originals with new thermal grease/heatsink compound. Unsolder and lift the center pin (collector) on each of the four transistors of the effected channel. Power it up and check across the outside pins of each device for proper bias-about a half a volt or so on each one. If the voltage is much higher, or not there you've got other problems that will require more diagnostic/troubleshooting. Do all the lights on the front panel work-or just the tape monitor indicators? If just the tape monitors light up, check resistors RN83 and RN84 on main board under the speaker connector board-remove the speaker connector board to get at them. These are bad on mine and I've yet to replace them. I believe these to be 920 ohm 1% precision resistors....

SOURCE: Marantz PM 4000 has cut out

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

SOURCE: can I replace the stock power cord on my Marantz

Hi Nancy,
Yes you can replace the power cord if it is already defective(open internal wire). You may buy on your local electronics store. But if the power cord is in good condition, there's no reason to replace.
Hope I helped you.
Have a nice day!
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