Diode replacement on Yamaha DGX 500 contact curcuit board

Discussion in 'Electronics Repair' started by Rick79, Sep 13, 2017.

  1. Rick79

    Rick79

    Joined:
    Nov 26, 2014
    Messages:
    262
    Likes Received:
    3
    I found a lot of corroded broken Diodes and i noticed someone has already replaced about 15 of them. I cant find anywhere on the service manual the original value of the diodes. The ones that were replaced are 1N4148, but im not sure if those are the right replacements. The only Diodes i have right now are 1N969B. Can i use those or do they have to be a specific voltage to work properly?
     

    Attached Files:

    Rick79, Sep 13, 2017
    #1
    1. Advertisements

  2. Rick79

    dorke

    Joined:
    Jun 20, 2015
    Messages:
    2,193
    Likes Received:
    599
    Hi Rick,
    The diodes are on the keyboard interface.
    The board operates on 5V.
    The 1N4148 is a good replacement.

    The 1N969B is a 22V zener diode,it may work since the voltage on the board is only 5V (much lower than the 22V zener breakdown).

    I would go with the 1N4148 they are very cheap and easy to get.(100 sell for about 1$)
     
    dorke, Sep 13, 2017
    #2
    1. Advertisements

  3. Rick79

    Rick79

    Joined:
    Nov 26, 2014
    Messages:
    262
    Likes Received:
    3
    Ok, Thank you, I appreciate it.
     
    Rick79, Sep 13, 2017
    #3
    1. Advertisements

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
  1. Kahlua53

    Yamaha A-500

    Kahlua53, Aug 21, 2004, in forum: Electronic Repair
    Replies:
    4
    Views:
    3,381
    Kahlua53
    Aug 21, 2004
  2. Chinaelectronics
    Replies:
    2
    Views:
    2,285
    Chinaelectronics
    Feb 14, 2011
  3. boogyman19946

    Looking for fried IC in a Yamaha DGX-505 keyboard

    boogyman19946, May 2, 2011, in forum: Electronics Repair
    Replies:
    7
    Views:
    1,953
    boogyman19946
    May 3, 2011
  4. Kartik.
    Replies:
    5
    Views:
    3,749
    Harald Kapp
    Jun 4, 2012
  5. hsr
    Replies:
    41
    Views:
    9,242
    one2waziru
    Dec 20, 2014
  6. eem2am

    Contact-less lighting = no contact sparks

    eem2am, Apr 3, 2013, in forum: General Electronics Chat
    Replies:
    0
    Views:
    672
    eem2am
    Apr 3, 2013
  7. N_Cook

    Yamaha Stagepas 500 quirk

    N_Cook, Nov 30, 2013, in forum: Electronic Repair
    Replies:
    0
    Views:
    674
    N_Cook
    Nov 30, 2013
  8. forever074

    NO CONTACT CURRENT AND NC CONTACT CURRENT OF RELAY

    forever074, Oct 20, 2015, in forum: General Electronics Chat
    Replies:
    1
    Views:
    351
    AnalogKid
    Oct 20, 2015
Loading...