Sunday, February 2, 2014

Technics sx-pr603 Digital Piano Repair: frequent lock ups, failure to turn on, intermittent problems and weirdness





This model of Technics Digital Piano (sx-pr603)  suffers from failing lead free solder around the IC's on the main board. Over time, the board heats and cools repeatedly and flexes, eventually cracking the microscopic connections between the surface mount IC's and the main board.

This causes lock ups, failure to turn on, and all kinds of strangeness with the unit.

It IS fixable, and we can fix them here at Offbeat Electronics, however be forewarned that the job generally costs about 250.00, and sometimes a few touch ups are necessary to keep the board running smoothly, in the first few weeks to a month or two after the repair (which are provided free of charge, of course). However, we have repaired these 100% of the time.

Repair consists of reflowing and adding solder around every one of the surface mount IC's. Also, I prefer to move the power transistors and related resistors off of that circuit board and to a separate heat sink, which I mount in the case.

I move them because I feel that the presence of those transistors and resistors introduces a tremendous amount of heat to the circuit board, and exacerbates the issues with the solder. Between reflowing the solder on that board, and removing the hot components from the board, full working order can be reached... I think this is a great sounding instrument, when it works, and worth preserving.
 

15 comments:

  1. I just sent an email to you asking for some further details on how to send the main board over to your business. You will receive it from Gustavo Armendáriz-Guerra. Many thanks in advance,

    ReplyDelete
  2. I just sent an email to you asking for some further details on how to send the main board over to your business. You will receive it from Gustavo Armendáriz-Guerra. Many thanks in advance,

    ReplyDelete
  3. I just sent an email to you asking for some further details on how to send the main board over to your business. You will receive it from Gustavo Armendáriz-Guerra. Many thanks in advance,

    ReplyDelete
  4. I just sent an email to you asking for some further details on how to send the main board over to your business. You will receive it from Gustavo Armendáriz-Guerra. Many thanks in advance,

    ReplyDelete
  5. Where can I contact you ? I h need a main board for my digital technics piano PR 903. Mostemple58@gmail.com. Thank you.

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  6. im in need of repair of a main board for a Technics PR603. Or do you sell these main boards?
    Thank You Russ

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  7. m in need of repair of a main board for a Technics PR603. Or do you sell these main boards?
    Thank You Russ
    PLease Contact me at rkshark@kc.rr.com

    ReplyDelete
  8. I have a Technics SX PR603 with distorted sound can you help? Nottingham.
    Dave K

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  9. Hi i need a main board for my Technics sx PR603

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  10. Hi where i can contact you or email you? i need a main board for my technics piano sx PR603

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  11. I would like to either get a replacement board or repair this one. It is a Technics main board, model pr603, pr703, pr903. Can you help us. PS the board is intermittent..When pressed on in differences places, will sometimes work.

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  12. I have a Technics sx-pr603 that sometimes does not turn on or I get a blue screen. Sometimes load crackling noises happen when it is just sitting but turned on or while playing. Can you help me? Please let me know or if not who you might recommend. Thanks

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  13. Did you get it fix.. if so please let me know what it was. I got the same thing here thanks

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  14. My keyboard sounds like a Dall computer when I turn it on please help me to find out want it is.. I love this keyboard. I need to get it fix

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  15. Good Day!

    Is there anyone that would be willing to repair the circuit board on our Technics SX PR603 Piano for our church?

    Please let me know.
    PaulPrass@StJohnsMinistry.com
    610-417-5925

    ReplyDelete