Marantz 2015 Refresh / FM Distortion (RH)

lurp

Active Member
I just scored an itty-bitty 2015 on the auction site for use in my camper trailer (gotta take the addiction with me!) It's by far the smallest Marantz I've ever owned, and I usually don't care for tiny amps that require a separate powered sub, but I kinda like the sound of this little fella. It does a fine job of driving a small pair of Audio Engine bookshelf speakers.

I just finished cleaning the controls, replacing all the incandescents with LEDs, replacing the speaker terminals, calibrating the offsets, and re-capping it with Nichicon Fine Golds (excluding the PS, and I missed the meter...) After my recent 4300 project, this one was a total cake walk!

Unfortunately, the one problem all of the above didn't solve was weak output / distortion on the right channel when it's in FM mode. Selecting mono immediately resolves the audible symptoms FWTW. Any ideas? Thanks!

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Picked up one a while ago.
FM issue.
Started checking voltages on the FM transistors from the top with a fine point probe covered to the top.

Found a rotted transistor by the heat sink.

Just recapped it completely. Found some other nasty stuff.

Works great now.
 
Just picked up one for myself and going through the trouble shooting. I've got a loud humming, increasing while the volume increases, along with no audible output on the phono input. Otherwise, a quieter hum on all other channels.

I'm thinking of recapping the phono preamp first, then preamp, and ultimately the amplifier board. Do either of y'all still have the recap list you used?
 
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