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My ME 70 is auto skipping. Example, from one effect to another without me touching any button. an electrician said it just need cleaning, but even after he cleaned it, it still has the same problem. please...

"Auto skipping. Example, from one effect to another".
Is it always so, or only sometimes?
What type of effect? Is it happen at the all Type of parameter? It can be observed from the changes sound is heard.
Yes "it just need cleaning", but, which parts are cleaned,and how he did? Is it potentiometer?
And if he simply cleaned by spraying contact cleaner, this is not effective at all, because it does not touch at all the inside of the pot.
Potentiometer need to be replaced, but if it is difficult to find, open the back lid of potensio. Fix the inside (you have to understand the potentiometer structure inside).
ME70 pots are look like this :

Sep 12, 2013 | Boss ME-70 Guitar Multiple Effects Pedal

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The snare triggers incorrectly

hello....just had the same proble... u probably need to clean or fix the port... (if u try to pull out just a little bit the jack u can see that everything it works properly).
I opened the snare (ccrew it out) , i cleaned the components with some spray and noweverything works.

let me know


Sep 24, 2012 | Alesis DM7 USB Electronic Drum Kit

1 Answer

Yamaha psr 550

When PSR550 keys stop working, or are intermittent, in any arrangement, this can be fixed (with work). There is probably TINY dust or debris which prevents a clean key contact from taking place; you must unscrew and open the PSR550 up like a ****, then unfasten the bottoms of the keyboard circuit boards. You can figure out how to move them without totally disconnecting them. You will observe how a tiny rubber-mounted contact presses against an interleaved circuit-board connection pattern to make contact when a keyboard key is pressed. Any dirt or crud on the contact area of the circuit board must be removed, because it will prevent the conductive contact from bridging the circuit cleanly and fully. I used 91% alcohol and QTips to clean all contact surfaces. It took me a couple of disassemble/assemble cycles to get all the keys clean and working, and the PSR550 back together. But first download the service manual: it will show you how to open it and access various components. You will see that the keyboard switches are much like calculator buttons on a TI-83 calculator. They are pretty well enclosed, but you will see how much dust can settle in just through various humidity conditions, especially if you take it to gigs. Good Luck.


Nov 24, 2011 | Yamaha Music

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Someone spilt half a pint of lager over my Mackie 1604 Vlz3. The desk operated for an hour after but gave some noise so I switched it off. I cleaned off all the surface fluid but some of the knobs, faders...

These units are not the easiest to open up without damage. The lager has likely evaporated and left behind some residue. Yes the pc board it attached by allen screws. Each control must be removed as well. This unit requires a complete clean with an electronics wash. It is possible that there is some corrosion as well. Please have this cleaned professionally and checked. It is in your best interest in the long run.


Dec 30, 2010 | Mackie 1604 Vlz3 16 Channel Mixer

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Some keys on my roland juno d wont sound. How do i fix this problem? Please help.

The key contacts need to be cleaned. They are usually conductive rubber pills in silicone domes that get pressed onto circuitboard traces by the keys. Disassemble to get at the contacts. clean ONLY with 99% isoprophyl alocohol and Q tips. Clean both the pills AND the circuit traces they contact.

Be very careful of cables when opening the unit. Document where all the screws go and their length and threads.

Nov 13, 2010 | Roland Juno-D

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The middle C on my keyboard seem's stuck, it's always off touch sensitive, is there a way I can open it up to clean it without any booby traps that may do more harm than good, it just seems dirty. I have...

The contacts are probably dirty. There are likely two per key.

Open and find conductive rubber pills that are pressed against a circuitboard traces for the contacts.

Clean BOTH the pills and the traces on the board with ONLY 99% isoprophyl alcohol and Q Tips.

Be careful of tendeer cables, many of which are flat.

May 18, 2010 | Music

1 Answer

Electric piano has key sensitivity problem

The key contacts have gotten dirty. They are often a conductive rubber pill that is pressed onto a circuit board. There are two pills per key and the difference in time of those contacting measures the velocity and the loudness for a piano voicing.

The contacts need to be cleaned with 99% isoprophyl alcohol and a Q-Tip. Use NO other solvent. Clean all contacts while the unit is open.

GREAT care must be taken with cables to avoid damage.

You did not specify your brand or model, but unless you are electronically adept, you should take it to a shop for repair.

Jan 26, 2010 | Music

1 Answer

It's a Roland HP-7e digital piano about three years old.

You may need to clean the contacts which are usually conductive rubber. I explained stuff for another Roland problem with two keys that were intermittent. I have an EP-7 that I had to do the cleaning of the key contacts. Use 91 or 99 % Isoprophyl alcohol to clean BOTH the conductive "pill" (Black under silicone rubber domes) AND the traces on the board where they press. Clean gently as the traces have a hard black coating.

Jul 26, 2009 | Roland Music

1 Answer

2 keys(reeds) are not working ,my keyboard is yamaha DGX200,how to open it

It is a design fault. A technician advertising on the net informed me i can get it fixed by him and yamaha will pick up the fee.

Nov 12, 2008 | Music

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Yamaha YPG 635 key/velocity issue The following problem occurs intermittently at different severity although the symptoms will often progress through these steps... I am relatively well versed in electronics so this is a question for the "Dr House of troubleshooting" to aid the diagnostic process 1. the following problems occur in every octave in most cases uniformly but there may be exceptions, especially in the earlier stages 2. pressing D, G,B will result in one max velocity (7F) G sound in addition to normal D and B 3. while pressing G, G# is mute or vice versa. Also when pressing D, Db is mute. (Db and G are on the same wire on the key matrix similarly as D and G# is on the same data wire) 4. While pressing either G or G# separately and only those both G and G# will sound at normal velocity. Similarly while pressing D or Db both will sound `Troubleshooting steps to date: took the keyboard apart, checked keyboard key back panel connectors and wires (I suspected that the lines connecting to Db and G, and the one connecting to D and G# are loose. Measured and seemed contacting intermittently, I though I fixed it. shook the keyboard like maniac. hit on keys with both fist. seemed OK. Upon reassembly, the problem went reappeared. Then I suspected an overheating problem. let the keyboard stand down for a day. Worked perfectly when I switched on. Tested the overheating theory with loading the keyboard with both Midi playback (amplifier load) and heavy playing and shaking. Worked perfectly. Entered test program, everything checks out. Worked perfectly for a week. This morning it is at step 2 of the failure process again - G# is mute while G is pressed..) I saw Fred Yearian's response to a similar problem: Would like to learn more about how to test out the loose diode issue. I was not able to "make bad permanently" the keyboard, and I am not able to purposefully invoke the failure.

Jul 31, 2012 | Yamaha YPG-635 Portable Grand Piano

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