andylong Posted August 12, 2014 Share Posted August 12, 2014 This is a strange one, although someone may well have experience with this issue. I was enjoying the PX 130 so much until it died on me today. It just went dead and would not play. The lights were out and there was nothing. I took out the adaptor (genuine AD-A12150LW) and I noticed the centre pin had actually moved and was touching the side of the hollow part. I assumed this should be in the centre so I moved it with a knife and still nothing. WHen I say nothing, there are no lights on, but both speakers omit a kind of tapping sound that suggests some power is getting through somewhere. Unfortunately the piano no longer works so it is either a new adaptor to try or a repair. Does anyone have any ideas about this issue. Any help is much appreciated. I haven't played for many years and I was enjoying the daily practice again. All the best, AL Quote Link to comment Share on other sites More sharing options...
Jokeyman123 Posted August 13, 2014 Share Posted August 13, 2014 Sounds like the adapter-if the pin was lopsided it probably broke connection-these adapter plugs with the molded surrounds are pretty prone to failing, I've had more than one go on me (not just Casio). Even repositioning the center pin will not help if the connection is broken inside since the plastic surround will be sealed and hold the broken wires in place-with no contact. Any sounds from the speakers could be traces of voltage left from components that stored electrical current for a few seconds before the power supply stopped working, such as capacitors and some integrated circuits. Try a new adapter. Make sure it is an identical Casio since a different adapter with the wrong polarity or too much or too little voltage can ruin the circuits inside-meaning expensive repair. I have the PX-350, there isn't much internally that can be damaged since components that go bad and could damage other things are "usually" in the power supply and since these are external to the PX-in the adapter-your piano is probably still fine. Just my 2 cents. Quote Link to comment Share on other sites More sharing options...
andylong Posted August 13, 2014 Author Share Posted August 13, 2014 Sounds like the adapter-if the pin was lopsided it probably broke connection-these adapter plugs with the molded surrounds are pretty prone to failing, I've had more than one go on me (not just Casio). Even repositioning the center pin will not help if the connection is broken inside since the plastic surround will be sealed and hold the broken wires in place-with no contact. Any sounds from the speakers could be traces of voltage left from components that stored electrical current for a few seconds before the power supply stopped working, such as capacitors and some integrated circuits. Try a new adapter. Make sure it is an identical Casio since a different adapter with the wrong polarity or too much or too little voltage can ruin the circuits inside-meaning expensive repair. I have the PX-350, there isn't much internally that can be damaged since components that go bad and could damage other things are "usually" in the power supply and since these are external to the PX-in the adapter-your piano is probably still fine. Just my 2 cents.Thank you for the quick reply. I think I'll try a new adaptor and have a chat with the Casio technical help team here in the UK. The sound from the speakers (90 beats per second or so) only comes out of the speakers when the adaptor is in and the power is turned on. It stops as soon as I switch it off. This suggests something is getting through but I'll see if a new adaptor works. All the best, AL Quote Link to comment Share on other sites More sharing options...
andylong Posted August 13, 2014 Author Share Posted August 13, 2014 Just had a chat with someone at the UK technical support centre and they think it is a circuit board issue. I mentioned the sound from the speakers but they suggest I bring it in. Problem is they have one (yes 1) repair centre in England! I have to drive to london to get it fixed. I told them that the speakers still make a tapping sound every 3/4 of a second or so and there are no lights showing when powered up but they insist it is a circuit board. I am not totally convinced by this. AL Quote Link to comment Share on other sites More sharing options...
Jokeyman123 Posted August 13, 2014 Share Posted August 13, 2014 Unless Casio is willing to repair under warranty (costly if not) I'd try a new adapter first. My experience with electronics tells me from your description that there may be insufficient voltage from the power supply-audio amplifier circuits will make this noise if there is some voltage, but not enough to bring the circuit to operation. Sort of like a portable radio with weak batteries-you'll hear clicking in the speaker depending on the circuit design, solved by putting in fresh batteries, or a working power supply. Even a marginal solder joint failure in the barrel plug can drop a supply's voltage because there is alot of "current' or amperage and these wires are very thin and frail causing it to put out some voltage, but obviously not enough to power the PX completely. Just my guess and hopefully that's it. Pretty rare to see defective circuitboards nowadays. it can happen, but from my training and experience, weirdness in a music keyboard is almost always due to a defect in the power supply, the first place I circuit-trace when something fails to work. Just repaired a "totally dead" Roland/Boss JS-5-the problem was a defective power switch which looked physically intact, but had a small contact inside fail. Replaced switch, problem solved. Quote Link to comment Share on other sites More sharing options...
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