Repairing a multi-effects guitar petal

Discussion in 'The Projects Forum' started by 2lss, Jun 1, 2013.

  1. 2lss

    Thread Starter New Member

    Jun 1, 2013
    3
    0
    I own a mid 90's Digitech RP20 that I have had for a while but unfortunately is inoperable due to damaged input and output level potentiometers. A few years back I emailed Digitech and they were nice enough to send me the schematics and BOM's for this particular unit. Unfortunately, I have been unable to locate these two pots since they are very specialized. I'm hoping that someone here who is more knowledgeable in this area could help me out. :D

    The two pots are described in the BOM as:
    P1: Input
    Part No: 100K402030
    SYMAN: 40-2030
    Description: 100K "W" 12mm, Rot Pot, 25mm D shaft Horiz

    P2: Output
    Part No: 100K402113
    SYMAN: 40-2113
    Description: 100K "D" 14mm, Rot Pot X2, 25mm D shaft horiz mt.

    Some pictures
    [​IMG]
    [​IMG]

    The biggest confusion for me is the "W" and "D" designation as I've only ever heard of A and B types before. From what I could find via google, they are basically audio taper pots, but have a slightly modified resistance curve to make adjustments easier.

    I did a LOT of searching to try and find suitable replacements, with not much success. P1 is not much of an issue since its a single wiper but P2 is a little more difficult since its a double wiper. The closest I could find is from Alpha Taiwan, however I can't find a supplier who carries it. The part numbers that I came up with are:

    P1 - Rv012AF-20-25A-100k http://www.taiwanalpha.com.tw/english/p_e_36.htm
    P2 - RV142F-20-25A-100K http://www.taiwanalpha.com.tw/english/p_e_38.htm

    So does anyone have any idea as to where I could get these pots from or know of something else that could work? Any advise is appreciated :)
     
  2. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    Have you tried All Electronics? They supply new and "pre-owned" parts and may have something to fit your needs.

    DISCLOSURE: I have no association with this supplier.
     
  3. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Some careful microsurgery might fix those parts. Bent metal can be straightened, broken pins can be resoldered.
     
  4. 2lss

    Thread Starter New Member

    Jun 1, 2013
    3
    0
    StayatHomeElectronics: I checked out All Electronics and unfortunately they do not carry the pots I need. I may keep them in mind for future projects though so thanks for the recommendation.

    THE_RB: I'm not an expert on repairing pots but I think these are pretty much destroyed. They are located on the back of the unit and have got kicked and banged around to the point cracking apart. I am wondering if I could some find some similar 100k audio pots and attach the longer knobs from the old ones.
     
  5. tubeguy

    Well-Known Member

    Nov 3, 2012
    1,157
    197
  6. 2lss

    Thread Starter New Member

    Jun 1, 2013
    3
    0
    Thanks Tubeguy, its not exact but it may get the job done. The pots I need are horizontal where as that one is vertical, but I'm sure I could bend the pins 90 degrees and get the same effect. The only downside is that it can't be anchored to the circuit board with the little metal prongs on the side.
     
  7. tubeguy

    Well-Known Member

    Nov 3, 2012
    1,157
    197
    Hot glue makes a good anchor. Mouser also has pots similar to the single pot.
     
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