Question about Yamaha DD65 PAK Electronic Drum Pad

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Yamaha DD-65 pad 2 has lost its sensetivety, if i hit it really hard it works, but when tapping it lightly like i can with the other pads, it does not sound. I have only just bought it second hand so wanted to check it out rather quickly. Thanks

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There is a setting to use that sets for using either sticks or by hands. If a single pad is thee problem, likely the sensor has come loose. Most of these use a piezo disc pickup and this may have separated from the pad. Open unit carefully and check for this visually. If separated, try to analyze what type adhesive was used. It is likely a contact cement. If so, clean surfaces of residue and use contact cement following the direction. Let dry overnight per the label on the cement. Be careful of the cables in the unit when opening. Keep track of which screws go where. They sometimes have different lengths and threads.

Posted on May 24, 2011


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I have the yamaha dd65 digital drum machine , they don't work at all , once I have turned the power on and I'm ready to play when I hit the pads it cycles through the voices then it stops the...

Make sure you have the ORIGINAL power adapter for this unit. It should say PA150 on it and provide 12 volts at 1.5 amps (1500ma). I am not sure of the polarity, but if the part number matches, you have the right one.

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Hey, I have had used the Roland PD8's for a while but recently 2 of mine have just stopped working. Maybe I hit them too hard but I'm not sure because the rest of my pads work. One will work if I hit it...

Check the connections on the undersides of the pads--they sometimes get loose as the vibrations rattle them around. Tighten the nuts that hold the pads inputs in place and reinsert the cables until they sort of "click." If that doesn't work, it might be the cables themselves, so try switching them with one you know is currently working. It'll change which sound is triggered where, but you'll know it's just the cables that need to be replaced, not the pads.

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I have a Clavinova 35/55/65 and 3 keys have stopped working. Did spill a coke there 10-15 years ago but except for the keys sticking a bit everything worked until now.

I couldn't find any tech data for 35/55/65, but it looks to be similar to a large Yamaha I had to repair a couple of months ago for this same issue.

Keyboards can be practically difficult to work in, and can have very fragile interconnects. I wouldn't recommend anyone unfamiliar with working with electronic equipment and the risks involved to attempt this repair.

It may well respond to careful cleaning of the rubberized contact strip that sits under, and is actuated by, the keys. The pcb pads underneath that act as contacts should be cleaned too. It's a good idea to remove any loose dust and debris with a vacuum and a soft brush before lifting the contact strip out, this reduces the likelyhood of introducing problems on other keys. I then used some isopropyl alcohol and a cotton bud on the underside of the strip and the pcb pads. Very little pressure should be used in this process, as extremely fine layers of gold are involved, it's vital for reliable contact. I prefer not to clean areas for keys which were not affected.

There may be an additional issue, if the coke really was the cause then there may also have been acid corrosion of pcb track over the years. This should be repairable though. Inspection with an illuminated magnifier is recommended, or a cheap USB microscope will do a good job too.

Personally, I would say that this really is a job for someone qualified and experienced.

Feb 03, 2011 | Yamaha Music

1 Answer

Clavinova keys not making full sound when hit

USUALLY the keys are matrixed in groups of 8 starting at a "C".

Each key USUALLY has two contacts. The differential time between the contacts closing is measured as "velocity" which is used to control the amplitude of the sound. The matrixing of the keys may be done in any of several ways but usually the bank busses are driven and the keys outputs are merged with diodes. You really need a schematic and Yamaha will usually supply the service manuals on CD for about $15.

If conductive rubber contactss are used, those should be cleaned with 99% isoprophyl alcohol. DO NOT USE CONTACT CLEANER !!!!!

Also clean the traces the contacts contact.

When a bank of the 8 keys are dead, you MAY have a broken trace on the coircuit board or a broken cable wire. Be careful inremoving ribbon cables as the end wires are pulled from the contacts unless the pull is distributed across the cable.

Sep 19, 2009 | Yamaha Music

1 Answer

When i hit some of the pads, the system seems to reset and all the sounds are also reset, for example when i hit it with a bit of force, pleae help

I can only assume you have one of Yamaha's DD drum units as you did not mention the model or anything.

ASSUMING that, first check the condition of the power connection. If the vibration breaaks the connection that would cause your symptoms.

Aug 31, 2009 | Yamaha Music

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