I travel 2 times per month with my MM6 i have it with a Hard Case, but im starting to think that this problem started exactly when i began the shows and the trips on BUS, this HARD case protects it from any hits the keyboard can recieve BUT i think that the vibration is doing some work here.
Sometimes when the volume is not correct i hit the surface softly near the volume control and sometimes near the plugs (jack), and the sound comes back.
Im kind of worried because my MM6 is my main keyboard, im trying to add to my hard case some new padding to reduce the vibration of the bus, but i need to fix this to be sure that preventing vibrations it wont do it again.
Thank you so much for all the help!
Cheers!
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It kinda depends on if a hammer is broke or key is broke. Or if a foreign object is stuck in there. Typically not hard if you can remove screws and remember how they go back in. TypicAlly the bottom panel comes off keyboards ( start by removing those screws ) or the top case will fold up ( still bottom of keyboard screws ) then multiple screws to realease keyboard assembly. May have to disconnect some wires/ ribbon cables so have a sharpie ready to label to ensure correct reassembly. Then it's all about if they have separate keys or a keytree or sometimes just removing ba key and reseating fixes sticking problems. Get yourself a can of blow off or contact cleaner just in case. Not sure who locally to you sell parts but you can always call manufacturer and ask who does their distribution for parts.
R94 would have nothing to do with your problem. Check soldering at the leads from the volume pots... actually check all soldering of pot leads and also the jacks. The fact that you found an unsoldered one implies improper soldering, period. Also check soldering of heavy component leads...
After the volume drops off, let the unit sit idle for a minute and then try it again. If the volume has restored for another brief period, suspect the filter caps are weak and voltage drops when you start driving the unit. In any case you need to have it serviced. Unless you can see the heater in a tube going out with vibration this may not be a DIY repair. If you see purple glow in a tube, replace it.
I had the same problem. This is how I fixed it: 1- Lay the MM6 upside down, remove the screws, open the back panel. 2- On your right side (the Volume PC board section), you will see component stand up (2 of them had 3 legs each, one of them is had more than 3 legs don't remember exactly) but 3 of them all had metal finish on their back. There are look like Power Transistor ( I do not have a schematic to be sure) but when these part get warm or hot (volume is only decrease when MM6 had been Turn-On for awhile), caused the volume to decreased. 3-Go to Radio Shack or other electronic stores, buy 3 HEAT SHRINK or you can make them your self (find- google to see what it look like, marterial...etc); 4- Use small screws and nuts, install these HEAT SHRINK into these 3 component then they will help these 3 components to stay cool all the time, therefore it will fixed the Volume decrease problem. 5- Yamaha should put HEAT SHRINK into these part when they designed.
The key contacts have gotten dirty. The contacts are CONDUCTIVE rubber pills that are pressed onto circuit traces on the circuit board under the keys. Onehas to dis-assemble the keyboard very carefully noting the size and location of all the screws and using great care of the cables that connect the top and bottom of the case.
when you remove the keys, you will find silicone rubber strips with the black pills underneath, two pills per key.
Clean these with ONLY 99% isoprophyl alcohol and Qtips as well as cleaning the circuit board traces they contact.
Carefully re-assemble the keyboard.
The key contacts are dirty. These contacts are conductive rubber "pills" (black) in silicone rubber domes. There are TWO per key and when you press a key, one hits first then the second. The time between this is measured by the processor and generates a "velocity" number which controls the loudness as would a real piano being sensitive to the rate/speed which you hit a key.
Unit has to be dis-assembled and the keys taken off and the contacts AND the CIRCUIT BOARD TRACES they press onto using ONLY 99% isoprophyl alcohol and Q TIps. Do ALL the contacts while you have it apart. Be VERY careful to not damage the ribbon cables tying the top of the case to the bottom AND document which screws go where as there are usually several different threads and lengths..
Might want to try turning the volume control back and forth. IF you hear scratching, there could be some dirty contacts that are causing this problem. Turning the volume control back and forth sometimes helps "clean" it.
We used canned air to blow dust from the volume control slider connection. It did increase the volume, not quite to the original level, but to an acceptable level.
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