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Problems with motherboard in Technics piano. Please help!
#2512794 02/20/16 07:40 AM
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I have been referred to here from another section of the Forum.

My Technics PX103 has no sound which i am reliably told is due to a motherboard fault. We have no real experts in this part of the Philippines where i live for this sort of thing, and it is not feasible to send it to the UK for repair. Would not a good IT technician be able to mend it? I may be showing off my ignorance in thinking this, but surely there are similarities between a m/b for a computer and one for a digital piano no? Anyway help would be greatly appreciated, and i send my thanks in anticipation. JH

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Re: Problems with motherboard in Technics piano. Please help!
JonHig #2512908 02/20/16 12:25 PM
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A good competent electronics engineer might be able to diagnose and fix some of the more obvious faults. A good schematic would help further.

But unless they are familiar with the general design principles, and the if fault is a bit obtuse it may end up being more expensive to diagnose and repair than the worth of the board.

Re: Problems with motherboard in Technics piano. Please help!
JonHig #2512910 02/20/16 12:31 PM
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If it is the motherboard, the next question is: is it one of the input plugs on the mother board that has become detached, or is it that the motherboard has overheated, other wise somehow melted? What is wrong with the motherboard exactly?

If the processor is the issue, and it's stuck fast to the motherboard, then the whole motherboard will need to be replaced. It maybe that there is something minor on the board that an electrician could fix: a broken resister or something. However, modern circuit boards are so complex and miniaturized, it might be beyond most people to fix. You'll need to find a computer hardware engineer: someone who might be able to test the motherboard without further damaging the instrument. I do not envy your position. The Technics PX103 is a dinosaur and finding replacement parts might be hard due to the fact that Technics don't sell instruments anymore.

In all honesty, you could replace that piano with a very cheap modern equivalent and get a better sound and action than that the Technics PX103. It's something like 14 years old, and allot has changed technologically since then. Furthermore, instruments of that age tend to go wrong quite often. You'll end up fixing it over and over again in the next 10 years. It might be kinder to have her put down. I know it's cruel, but you might be better replacing her with a younger fitter model.


Instruments: Current - Kawai MP7SE; Past - Kawai MP7, Yamaha PSR7000
Software: Sibelius 7; Neuratron Photoscore Pro 8
Stand: K&M 18953 Table-style Stage Piano Stand
Re: Problems with motherboard in Technics piano. Please help!
JonHig #2512947 02/20/16 03:06 PM
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Technics pianos are long gone, no spares available and in all likelihood not repairable. Time to move on.

Re: Problems with motherboard in Technics piano. Please help!
JonHig #2513003 02/20/16 06:23 PM
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Thank you all for your input, or is it output? Anyway i could be fixed by a guy in England who is a Technics specialist. The problem is the cost in sending the motherboard to and from him, plus his charges which make the exercise pointless.

I will clarify what is wrong however as i have been asked to. There is just no sound but it did came back on once. As i was playing all the red lights came on and the sound froze as though i had my foot on the sustaining pedal. I switched off and that was then it! No overheating.

Thanks to all but sorry to have so much doom in the replies. Lol!

Re: Problems with motherboard in Technics piano. Please help!
JonHig #2513472 02/22/16 01:25 AM
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I have a 1994 Roland KR4500 which started playing up about 10 years ago. It would make random popping sounds through its speakers, and the display would go crazy (values altering) and the pitch bender no longer worked, and it would emit an electrical smell. Sometimes you'd get no sound at all. Because the KR4500 was pretty well top-of-the-range in its day, and thus cost a lot, I didn't want to have to trash it, so on two occasions I paid the only authorised Roland tech in my town to see what he could do. The problem was due to leaky capacitors on the circuit boards, which were cutting through the copper circuitry. The capacitors were replaced and the leaks cleaned up and the damaged copper circuitry was bridged with wires soldered in place. This helped initially, but had to be done a second time, and was starting to get expensive. Amazingly, despite the pitch bender never coming back to life, most other things seem to work ok, and there are no more popping noises. If it starts doing it again, I will take it apart myself and look for more leaky capacitors.

I am just wondering whether your Technics keyboard might have similar electronics and whether you could do a visual check of the capacitors. I know it is a bit of a longshot, but thought it was worth mentioning.


1993 Roland JV1000 76 note workstation synth with Pop and VE-GS1 expansion boards ] 1994 Roland JV1080 Multi-timbral sound module ] 1994 Roland KR4500 Intelligent Piano ] 2008 Korg MicroX sound module ] 2015 Kawai MP7 Digital Stage Piano
Re: Problems with motherboard in Technics piano. Please help!
JonHig #2513908 02/23/16 01:20 AM
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I have found someone in Manila who says he can mend the motherboard. He says he cannot do it unless it is attached in the piano. It is quite a distance from where i live to his workshop, and is costly to take the piano there. Probably the same as paying him to take his time coming to me. One has to be wary, as it is the Philippines after all! Lol

I presume it has to be tested and must be attached in order to do so. It that correct please? I do know of an expert in the UK where you can just send the boards to be repaired

Thank you once more! JH

PS No it does not seem to be a capacitor, as far as i can see>

Last edited by JonHig; 02/23/16 03:04 AM. Reason: Correction
Re: Problems with motherboard in Technics piano. Please help!
JonHig #2513955 02/23/16 05:20 AM
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Not knowing the price of labor in the Philippines, nor the cost of international shipping, it's hard for me to know whether it would or would not be economical to effect repairs on your piano.

But, given that a decent new Casio piano can be had for $500 US, it seems to me that it's time to scrap the old piano and buy a new one.

Re: Problems with motherboard in Technics piano. Please help!
JonHig #2513965 02/23/16 06:00 AM
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It is much more economical to have it repaired. How you can talk of scrapping it when it is repairable, is beyond me! It will cost at most about P3500 (50/60 quid)if the guy comes to my home. A fraction of that if i took it to him BUT, that is if i take only the motherboard. If you would care to read my post above, it should clarify things somewhat!
















Last edited by JonHig; 02/23/16 06:01 AM.
Re: Problems with motherboard in Technics piano. Please help!
JonHig #2513967 02/23/16 06:12 AM
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In your first post I read:
Quote
... i am reliably told is due to a motherboard fault. We have no real experts in this part of the Philippines where i live for this sort of thing, and it is not feasible to send it to the UK for repair.
From that I gathered that it cannot reasonably be fixed. (As bobbo said ... it's time to move on.)

But your subsequent post says:
Quote
I have found someone in Manila who says he can mend the motherboard.
If that is so, then have at it.

I plainly said that I do not know the cost of labor in your area, so there's no need to react so strongly. If it indeed can be fixed for 60 quid, great.


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