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Marantz 6300 speed issue

Thanks for sharing those pics. Did you have to cut the shafts on those Bourns pots? Looks like they would be too long.
 
Hello everyone! i'm also restoring my 6300, it has the same speed issue, it doesn't keep constant rpm... i will do a full recap, and also will replace some resistors (R809 is out of value)...
but checking voltages i a came across with some interesting things, fisrt: all voltage values are low.. except J811 witch is way to high (see schematic) also between J801 and J802 i have
30V AC... and it should have at least 35V?? (see schematic)... and the second thing is that comparing with @Golanr's board I have two extra components (see picture) i have an extra diode and an extra resistor
someone knows if this components are factory? maybe a later revision... or should i remove them?

thanks for the help!! i hope i can bring to life this classic 6300

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I need to chime in on this, as this unit gave me loads of frustration and even more grey hair. I experienced the exact same issues as many here. Slow, wobly speed. Went for the pot cleaning (all 4) to no avail. Then had a shot at the capacitors. (all of the powerboard, and the small tantalums at the motorboard. Fired it up, and now it went waaay to fast. Not sure if it was speed pot related or capacitor related I put it aside for a few months. Had another run at it today and speed was still way way too fast. We're talking 50-60 rpm at 33 speed) "Mkai..need to buy new speed pots" I thought and went out for several hours, accidently leaving it "ON". Came back to do one last run of motorpot-adjustment before ordering lots of stuff. Fired it up for fun first, and now it had correct speed. Not sure what happened, but it might be that the new capacitors needed to charge to a certain level before making it work as it should? Thought this might be relevant to others, as this TT - sexy as it is - can be a real nightmare when not working as it should.
 
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