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Thread: Casio Privia PX410R

  1. #1
    Junior Member gc.cipriani's Avatar
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    Casio Privia PX410R

    Good morning,

    I must to repair (for tyhe school of my son) a digital keyboards (Casio privia PX410R). Where I can found the schematic/electronic diagram ? The keyboard had a problem with the volume (is always low and if a turn the potentiometer don't change).

    Somebody can to help me ?

    Best regards

    Giulio

  2. #2
    Supporting Member Jazz P Bass's Avatar
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    I cannot locate a service manual for that model.

    What is wrong with the keyboard?

  3. #3
    Junior Member gc.cipriani's Avatar
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    The problem is this: the volume don't change. The level is very low. If I change the set point with the potentiomete, the volume don't change (I hear something if I go near the loudspeakers). I haven't connected an external amplifier but at school (the keyboard is of the school of my son) this test it's been done with the same result. I think that the problem can to be in the output amplifier. I need the diagram for to avoid loss of time. I want to check also the output connectors (two jacks) because on another keyboard that I have repaired (of another productor) one of this was been damaged and the signal do not pass trough it. I think that the problem can be the same but, for check it, the electric diagram is very useful !!!
    bye
    Giulio

  4. #4
    Supporting Member Jazz P Bass's Avatar
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    Have you tried connecting a headphone at the 'headphone' jack?

    Have you tried going into the 'microphone' input. This has a separate level control.

  5. #5
    Junior Member gc.cipriani's Avatar
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    I've connected the headphone but I don't hear nothing. I will try with the mic (it's possible that the problem is in the out section of keyboard). I want also to verify accurately the jack out (many young students uses the keyboard and it's possible that they have damaged the connectors. These jack with many internal switches are very problematic).
    I will try, with the oscilloscope, of verify the signal point by point (whitout diagram is not easy but I haven't other solutions)

  6. #6
    Junior Member gc.cipriani's Avatar
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    The connectors are ok. The problem (I think) is in the volume regulator that is a strange component. It'snt a normal potentiometer. Initially I think tyhat is an encoder (for the 5 pins) but on the audio card (go directly to this) there aren't microprocessor or decoder circuits. Can to be a stereo potentiometer ??? I send here a photo.

    img_20170319_120539.jpg

  7. #7
    Supporting Member Jazz P Bass's Avatar
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    That appears to a '3 pin' potentiometer.
    The other two legs are for support.

    Do you have a signal going into that board?

  8. #8
    Junior Member gc.cipriani's Avatar
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    It's a 5 pins potentiometer.... I've found the data sheet... It's an ALPS potentiometer. I think that can to be this: RK09K/RK09D Series - Basic information
    I've send a request to ALPS for info. I've tested the potentiometer with a tester and the resistive value don't change (the cursor is damaged?). If I found the potentiometer ok. Otherwise I can to use a stereo potentiometer with a similar connection. I think that the problem is this (mechanical problem)

    p.s. the 5 pins potentiometer for me is a big surprise ! I know the standard and stereo potentiometer... but I haven't never seen potentiometer with 5 pins (two pins in common mode)

  9. #9
    g1
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    That is a dual (stereo) stacked pot. The 2 pins in the top layer are the 2 wipers.
    Certified Dotard

  10. #10
    Senior Member Enzo's Avatar
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    And flip the board over and see where the traces go. 5 legs sounds like a stereo pot to me too.

    Before you decide the pot is bad, scope the signal reaching it. If the signal is super weak getting to that control then the control can;t make it louder.
    Education is what you're left with after you have forgotten what you have learned.

  11. #11
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    If you really need to replace the potentiometer, you can order it from Mouser.
    As a rule Casio uses 5KOhm (Mouser part number 688-RK09K12CKA502).
    You need only to check whether this 30mm shaft length will be suitable.
    g1 likes this.

  12. #12
    Junior Member gc.cipriani's Avatar
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    It's the same (as productor). My potentiometer is another (shaft of 25 mm) but it's an ALPS !
    Thanks !!!
    I will replace it asap !! I can't order a single piece but I will search somebody that can to order it for me

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    Quote Originally Posted by gc.cipriani View Post
    It's the same (as productor). My potentiometer is another (shaft of 25 mm) but it's an ALPS !
    Thanks !!!
    I will replace it asap !! I can't order a single piece but I will search somebody that can to order it for me
    Its the pot! I just fixed one last month on a PX110. The tab pin to the rotary shaft breaks off. Pot opens and feels loose.

    You can't find that pot anywhere. Casio says not in stock.

    What I did was find a similar pot and then removed the plastic shaft from new one (10k pot) and put it on the orig 5K pot.

    It's also a strange layout for the pins so be cautious of replacements.

    This should work for Eu dealer
    SOUNDCRAFT M ALPS ROTARY POTENTIOMETER 5-PIN 10K Rotary Potentiometers dm1248

    For USA
    http://www.mouser.com/ProductDetail/...jc3XqKL3wnY%3d

    Or this one like I ordered. It's Hz mount, and 10K but I only needed the shaft. It was a couple mm longer, but I was able to cut it down easily with a util knife. I just removed the good plastic shaft and put that in the old one. Worked perfectly. about $4 w shipping.

    https://www.westfloridacomponents.co...9K12A0A5F.html
    Last edited by guitardad; 03-22-2017 at 08:22 PM.

  14. #14
    Junior Member gc.cipriani's Avatar
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    I haven't found the correct pot. The delivery time is of 8-10 weeks !!!!
    I've mounted another pot and I have used the same configuration (a 10k log pot).
    Now all works correctly (with the volume).
    But I have another BIG problem.
    When I start the keyboard and I play a note, I hear the note that change. If a play for example a central DO, i hear a "sweep" from lower notes to higher notes and stop to a note different and don't change. In the specific case I switch on the keyboard and play DO. I hear a note that start with a SI and sweep to a RE and remain RE. If I play the DO, i hear a RE (tested with a real piano). All the notes are shifted of +1.
    Can you help me? How I can to solve this problem?
    Giulio

  15. #15
    Senior Member Enzo's Avatar
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    Check to see if you have a transpose function turned on. Also check to see if "portamento" is turned on. If so, turn them off.
    Education is what you're left with after you have forgotten what you have learned.

  16. #16
    Junior Member gc.cipriani's Avatar
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    I'm tryng to attach an audio file with the problem
    Attached Files Attached Files

  17. #17
    Junior Member gc.cipriani's Avatar
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    I d'nt know this keyboard (is not mine). Where I can found them?

  18. #18
    Junior Member gc.cipriani's Avatar
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    SOLVED ! External potentiometer not connected (for the sweep) and the system goes in error...... reconnected, it's all ok !
    Thanks at all !!!!
    Best regards
    Giulio
    Jazz P Bass and g1 like this.

  19. #19
    Supporting Member Randall's Avatar
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    To follow up, these pots are a common failure on these Privias. I replaced it on two keyboards from the same customer last year ( he used to play in Rare Earth). And as far as I know, I bought the last one from KORG USA, because when I went to get the second one, they told me they had no more. So I had to find one I could modify by bending the legs and jumpering. I wish I could remember which replacement I used.
    It's weird, because it WAS working fine.....

  20. #20
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    Quote Originally Posted by Randall View Post
    To follow up, these pots are a common failure on these Privias. I replaced it on two keyboards from the same customer last year ( he used to play in Rare Earth). And as far as I know, I bought the last one from KORG USA, because when I went to get the second one, they told me they had no more. So I had to find one I could modify by bending the legs and jumpering. I wish I could remember which replacement I used.
    A few shops online sell the board assy. $110 lol

    Seriously just buy the pot from that link I posted. It's a buck and a few bucks shipping. Remove the shaft from that one and put it in the old one. Reassemble, all fixed.

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