How to simulate a potenciometer encoder?

Collapse
X
Collapse
+ More Options
Posts
 
  • Time
  • Show
Clear All
new posts
  • Francesc V.
    Tempus fugit
    • Nov 2022
    • 221
    • Catalonia

    #1

    How to simulate a potenciometer encoder?

    Hi:

    I have a Rotel amp where the main volume works badly...........going clockwise the volume goes up and down.......anticlock wise more or less the same..........it's like a fight to turn volume up or down......xDD

    Here is the schematic.

    My question is how I could simulate to turn volume up or down to isolate the issue......maybe it's not the encoder but it's the main board.

    A PWM signal between pin 1 and 4???

    Thanks in advance,
    Francesc.


    Click image for larger version  Name:	Captura de pantalla de 2025-01-28 20-35-50.png Views:	0 Size:	38.3 KB ID:	3558992

    Attached Files
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30952
    • Albion

    #2
    it's not pwm,
    it's quadrature encoding.
    simplest test is to get a rotary encoder from ali or ebay for under a € and wire it inplace of the original
    you get get them loose or on a pcb with pin headers for beer money
    this datasheet shows the switching
    Attached Files

    Comment

    • truclacicr
      Badcaps Veteran
      • Apr 2019
      • 293
      • australia

      #3
      The EC16B24... number is an Alps part. I can see plenty at AliEx.

      Comment

      • Francesc V.
        Tempus fugit
        • Nov 2022
        • 221
        • Catalonia

        #4
        Thank you all for the feedback.
        I've already ordered one........but in the meantime I managed to open it, clean it.........and it's back to life. Not sure how much will last :-)

        Comment

        • sam_sam_sam
          Badcaps Legend
          • Jul 2011
          • 6027
          • USA

          #5
          Originally posted by Francesc V.
          Thank you all for the feedback.
          I've already ordered one........but in the meantime I managed to open it, clean it.........and it's back to life. Not sure how much will last :-)
          It depends on how much moisture is in the area of this device did you clean it out with contact cleaner or did you 99% alcohol to clean them out or something else

          Comment

          • Francesc V.
            Tempus fugit
            • Nov 2022
            • 221
            • Catalonia

            #6
            Soldered on the PCB, I removed/bent the 4 staples.............then disassembled parts, cleaned with Isopropanol and mount them again.

            Comment

            • sam_sam_sam
              Badcaps Legend
              • Jul 2011
              • 6027
              • USA

              #7
              Originally posted by Francesc V.
              Soldered on the PCB, I removed/bent the 4 staples.............then disassembled parts, cleaned with Isopropanol and mount them again.

              How difficult was this

              Comment

              • Francesc V.
                Tempus fugit
                • Nov 2022
                • 221
                • Catalonia

                #8
                Not very difficult, but I needed a microscope to align correctly the three internal pins that make contact with the encoded wheel.

                Comment

                Related Topics

                Collapse

                • redwire
                  Onkyo TX-SR607 replacement volume control encoder
                  by redwire
                  I had an Onkyo SR607 with a volume control encoder not working, turning the knob up the volume number would move around crazy and not work reliably.
                  Took it out and apart and no, it's not oxide or cleaning, lube required etc.- the metal is simply worn out. It's a 30mm part with metal bushing.

                  Volume control encoder Onkyo P/N 25065655W, Alps EC12E2425 is some oddball variant I could not find. I did the dig and tried replacement part Alps EC12E2420803 and it works/fits just like the original. Mouser 688-EC12E2420803 for $3.00
                  09-09-2022, 08:59 PM
                • karthur
                  Vizio D65x-G4 Volume changes on its own
                  by karthur
                  On this Vizio D65x, the volume will change on its own. I don't mean like during commercials where the volume will increase. I mean its like the (+) volume button on the remote is pressed and the actual volume dialog is displayed on the screen going up. It will do this, then the volume may start going down. It might go all the way to "0"or it might stop at a different number, then start going back up. The whole time its doing this, the volume dialog is shown on the screen.

                  It wont do it until it has been "ON" for 20 or 30 minutes, so it does seem to be heat related....
                  06-05-2025, 08:13 AM
                • crackedprint
                  Sony HCD-HX80R Amplifier Volume Control Problem
                  by crackedprint
                  I have a strange fault on a Sony amplifier. The volume control varies the display from MIN, then 1 up to 30 and then MAX as expected. At MIN there is no sound. However, at 1 it is quite loud and increasing above 1 does not change the sound level.

                  I have tried a Cold Reset as per the service manual.

                  I have looked at the I2C clock and data to volume control chip IC501 (BD3499FV). Data is only sent to IC501 when the volume is set to MIN or 1. At any other setting no data is sent to IC501.

                  I have looked all the way through the service manual and tried many online...
                  01-21-2025, 12:18 PM
                • BigOof
                  Marantz SR5007 popping on volume change and mute in Direct Mode
                  by BigOof
                  Hi,

                  I bought a used Marantz SR5007 and it's giving me some issues that I can't seem to really place. It functions well in most settings, ARC mostly works, it has no issues driving my speakers in any of the digital input modes, but I'm having issues running analog inputs in direct or pure direct mode. For some reason in this mode there's distortion for every volume increment I give it, but once the volume is stable it has no issues. Muting creates a loud pop, switching to another source also causes a pop and so does turning off the amp in that mode. Again, no issue in the digital modes....
                  12-12-2024, 06:15 AM
                • Storyteller12
                  Samsung Soundbar Q900T Cuts Off if Volume above 30
                  by Storyteller12
                  I have this soundbar and when I turn it on it works until I turn the volume above 30.
                  Then the display show “PROT” protection and shuts off.

                  I can turn it right back on and it works until volume hits 30 again.

                  There is a little static on the surround speakers so I unplugged them but still have same problem. I tried unplugging all speakers also and when volume goes above 30 it shuts off.

                  I can turn the volume above 30 if nothing is playing but as soon as I play something it shuts off.

                  It will play fine for hours with volume...
                  03-21-2023, 12:31 PM
                • Loading...
                • No more items.
                Working...