Dewalt Tuning PWB Assembly

Discussion in 'Technical Repair' started by Zorac, Apr 21, 2018.

  1. Zorac

    Thread Starter New Member

    Oct 9, 2016
    23
    1
    The board is out of production so I can't get a replacement, unfortunately the tuner doesn't have a single worth while marking on it. Even popped it off the board and nothing. Any idea where I could find a replacement component or an equivalent? They have a newer board which looks like to be the same component so I could probably buy that one, pull it off the new board and put it on my old board which is my last resort.

    https://www.ereplacementparts.com/images/part_p_100833_156703464.gif

    Thanks.
     
  2. Zorac

    Thread Starter New Member

    Oct 9, 2016
    23
    1
  3. Zorac

    Thread Starter New Member

    Oct 9, 2016
    23
    1
    a few more questions, as i look around inside the radio, i have the urge to upgrade a few components of it.

    first, it has an aux input, i was thinking of connecting the output of a bluetooth module to that so i could do either bluetooth or the wired 1/4" plug if i wanted. specifically this module:
    https://www.aliexpress.com/item/Blu...ied-DIY-Bluetooth-module-4-0/32839790465.html
    as there are no buttons so i can hide it away in the unit. presumable anything can connect to it with no need for pairing modes or passwords.

    Secondly, the radio uses a pair of AA for save the memory, but they don't last long (maybe 2 or 3 months), i was thinking of putting in a rechargeable battery circuit into it. an 18650 battery with a charger, then a 3.3v buck/boost regulator with a diode to drop it the output down to 2.7v or there an easier way to do that? i doubt the draw it huge (two AAs do last a few months after all), maybe use a basic zener regulator circuit with a transistor instead of the 3.3v regulator and diode?
     
  4. Zorac

    Thread Starter New Member

    Oct 9, 2016
    23
    1
    i though i would just follow up in case anyone else tried to repair one of these radios, it took a while to arrive but the follow part is the right replacement:

    5PCS/LOT EC12 encoder 12 positioning 12 pulse length 20MM digital rotary potentiometer
    https://www.aliexpress.com/item/5PC...801.html?spm=a2g0s.9042311.0.0.27424c4d8ml35Q

    the quality is pretty low on them though so to work around that, be very careful with the heat when soldering them and the dewalt knobs stick on pretty good so when you have them off slot the shaft with a dremel or hacksaw so that they go on and off easier (i did both the power and tuner knobs this way) the new encoder is not very tolerant of much force in the direction parallel to its shaft. good thing they give you 5 as it took me a few to get it right, although to be fair i was learning how to use my hot air re-flow station at the same time. :) the picture attached shows the original dewalt rotory encoder (grey shaft) and the aliexpress replacment (black shaft).

    still plan on adding the lithium battery back up for the radio and bluetooth for the stereo but am waiting on parts.
     
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