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Technics SX-PX224 digital piano

 
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subspace



Joined: 12 Jul 2010
Posts: 3

PostPosted: Mon Jul 12, 2010 10:31 pm    Post subject: Technics SX-PX224 digital piano Reply with quote

I have acquired a Technics SX-PX224 digital piano which has a power-up fault. Essentially when it is switched on the LCD display and all the mode selection buttons are dead and it doesn't make a sound. However, there is a small red power LED which lights-up.

I have checked for loose connectors, blown fuses and any obvious signs of damage. I was checking some of the pins for voltages and was able to find +/- 15V but not 5V although I did find lots of pins at 1.3V. I found one pin labeled +5D but the voltage on it was only 1.3V.

Does anyone have a service manual for this piano?
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Pentode



Joined: 30 Oct 2007
Posts: 85
Location: Nr. Manchester (UK)

PostPosted: Tue Jul 13, 2010 6:48 pm    Post subject: Reply with quote

We need to trace that voltage back to source, usually a regulator... I had something like this in a digital piano but it wasn't a Technics.

I found two chips pulling the 5V rail down... I advised to return it to the makers as these were customized chips - not readily available,. To find the fault I cut the supply track to various chips, luckily the 2nd cut proved there was a very low reading between the chip supply and ground, so I cut the supply track to it's mate and that chip was the same....

I called it a day suspecting some that someone had used the wrong power adapter, used too much voltage or connected it up wrong.

But DO start by tracing the 1.3 V back to source and start there, it may be just a faulty regulator... and it may well should be 1.3V

Dave
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subspace



Joined: 12 Jul 2010
Posts: 3

PostPosted: Thu Jul 15, 2010 7:03 pm    Post subject: Reply with quote

There also seems to be some sticky orange "goo" around one of the larger capacitors. I think it is adhesive but can capacitors "leak" in this way?
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subspace



Joined: 12 Jul 2010
Posts: 3

PostPosted: Thu Jul 15, 2010 7:06 pm    Post subject: Reply with quote

I should point out that the capacitor is not bulging or anything.
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Kerrybeth
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PostPosted: Thu Feb 17, 2011 4:00 pm    Post subject: Technics sxpx 224 Reply with quote

I have a technics sxpx224 with the same problem. I found a repairman to come and look at it and was told that the main board would need to be replaced at the cost of $900. So, now I have this beautiful piano that is of no use. :0(
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kerrybeth
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PostPosted: Thu Feb 17, 2011 4:01 pm    Post subject: sxpx 224 technics Reply with quote

If there is anyone in the Morgantown WV area that could work on this piano or possibly give a second opinion, I would greatly appreciate it.
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Hoelly



Joined: 03 Nov 2016
Posts: 1

PostPosted: Thu Nov 03, 2016 3:55 pm    Post subject: Piano SX-PX224 Reply with quote

hi subspace,
do you still have this piano?
I bought one a few days ago and it had the same errors, after 4 hours searching I was able to find the reason and now it works. Do you need some hints? Can I help?
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