Hi, I noticed the your recent post describing the contact problem on yamaha keyboards. Mine is similar, I have a Yamaha YPP-50, and it seems to all be in one " area " of the keyboard, 2-6 keys. Could you please help me by pointing me in a direction of part(s) #'s etc. ? Many Thanks.
Probably the best thing to do is call the Yamaha service center nearest you. I live in the Los Angeles area, and the Yamaha service center closest to me is in Buena Park. I called them on the phone and told them what the problem was, and they knew immediately what parts were needed and they shipped them out that same day.
The contacts that seem to wear out the fastest are the ones near the middle of the keyboard. On my CLP-170, it's the keys between middle C and the G above that -- probably no more then 4 or 5 keys. However, I ordered replacement contacts for all 88 keys because once you take the piano apart to replace the contacts, you may as well replace all of them.
a 6ya Expert can help you resolve that issue over the phone in a minute or two.
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Hi, This is very likely to be a dirty key contact.
If the loud key is not touch sensitive or by turning the touch off, if all the keys are the same volume then this points to a dirty key contact.
All the best, Chris the Fader.
Hi, This is probably due to worn rubber contacts. The sound is switched by pressing a key which in turns press a carbon contact on the PCB under the key. In time these wear out and need to be replaced.
Firstly open up the keyboard and locate the rubber contacts, check to see if each one is seated squarely, if they are not seat straight then this can create the problem you mention.
If all are OK then you will need to replace the strip which is causing a problem.
Spares are available from many sources including :
Dead keys on Yamaha PSR e413 keyboard:
Flip keyboard upside down, remove cover screws (use marked cardboard template to remember where they came out), spray suspect key-contacts with fast-drying contact cleaner, (usually a PCB with a matrix of contacts under keys), re-assemble base cover, wiggle faulty keys as far as possible to 'scrub' any dirt or oxidization. If this cleaning trick doesn't work, get a pro to check it.
You MAY be confusing touch sensitivity with VELOCITY sensing. Touch sensitivity is PRESSURE put on AFTER the note sounds that causes modulation. VELOCITY is what is used for example to control the loudness of pianoo notes depending how fast they are struck. VELOCITY sensing is done by using TWO contacts at every key... one closes first. IF one of these gets dirty, FULL velocity will be sensed and it will be LOUD. The contacts can be cleaned using ONLY 99% isoprophyl alcohol and Qtips after MUCH disassembly of the keyboard. The contacts are conductive rubber pills in silicone rubber domes. Clean boththe contacts and the circuit traces they pres down onto.
If so, try to tighten down (fix firmly in place) the wire mesh that protects the speakers, if it's loose, it will vibrate and cause distortion in the sound.
I once had to repair a portasound which sounded really crappy when a group of keys was struck at high volume, and it would only calm down when i fixed the speaker mesh so that it didn't vibrate with loud sounds.
You may want to put some rubber or similar into the groove where the mesh edge fits in to prevent it from vibrating (i solved mine just by tightening up the mesh strips where they protrude into the housing).
If this doesn't help, then it's something else (possibly a bad or dirty connector contact or a bad solder contact).
Do you cover the keyboard when not in use as small particles of dust can make their way in between the keys?
You can try blowing any obstruction out with a can of compressed air, may solve your problem.
As I'm not familiar with this Model, does the keyboard have 'touch response' on board? If so there will probably be a 'Contact' strip made out of tubular rubber under the keys and this can sometimes 'burst' especially on a certain key that is played most of the time. For example if you play mostly in the key of 'G' or keys that use that note....