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Sony DE-425 volume motor/knob

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    Sony DE-425 volume motor/knob

    So, I had it in the living room but the remote control for the volume started slowing down and eventually starting and stopping.

    I got the motor out, think I broke a trace but there is enough exposed on it I can probably blob the lead to it

    Also, I can't find the damn knob. I'll get there when I get there

    Anyways, here is the potentiometer/stepping motor

    It has an 8x3 pins, and I can't find a replacement, only ones that are single row (8x1)
    Attached Files
    Cap Datasheet Depot: http://www.paullinebarger.net/DS/
    ^If you have datasheets not listed PM me

    #2
    Re: Sony DE-425 volume motor/knob

    Ali has items that look similar, I guess it down to spec as to whether they match. . https://www.aliexpress.com/item/4000822055553.html
    https://www.aliexpress.com/item/4001063463840.html

    Comment


      #3
      Re: Sony DE-425 volume motor/knob

      Originally posted by diif View Post
      Ali has items that look similar, I guess it down to spec as to whether they match. . https://www.aliexpress.com/item/4000822055553.html
      https://www.aliexpress.com/item/4001063463840.html
      Interesting. Searching for the model with 8x3 rows show it's for "six channel", and the 100KAX2 says for stereo, like this amp. I wonder if they used this volume board for a number of receivers, some 6ch, 4ch (quadraphonic), and stereo like this one, and just used the same pot for all the different models. Makes me wonder if an 8x1 will work

      next problem...if I can't find it here, finding a knob
      Cap Datasheet Depot: http://www.paullinebarger.net/DS/
      ^If you have datasheets not listed PM me

      Comment


        #4
        Re: Sony DE-425 volume motor/knob

        https://aliexpress.ru/item/100500171...00017326156038

        225-446-11 RES, VAR, CARBON 100KX6
        Last edited by lotas; 04-02-2022, 11:54 AM.

        Comment


          #5
          Re: Sony DE-425 volume motor/knob

          How do I see how many ohms this is? Which pins would show me the max impedance on the one I have?
          Cap Datasheet Depot: http://www.paullinebarger.net/DS/
          ^If you have datasheets not listed PM me

          Comment


            #6
            Re: Sony DE-425 volume motor/knob

            Of course the final issue is the knob. I've found them for similar models but not this one. Hard to tell the fit from a picture

            And ebay for parts only the shipping is hell. Wonder if I can ask a parts only seller I'll buy just the knob

            I'm almost tempted to try Craigslist. They had a few good amps there but what can I say, I like a project
            Cap Datasheet Depot: http://www.paullinebarger.net/DS/
            ^If you have datasheets not listed PM me

            Comment


              #7
              Re: Sony DE-425 volume motor/knob

              I'd look at Ali for the knob. The shafts are generally 6mm, then it's diameter and depth to measure.

              Comment


                #8
                Re: Sony DE-425 volume motor/knob

                Does anyone know the pot impedance? Or how to measure it with my meter? I'm guessing just turn it all the way down and measure

                I found the schematics but the site is low resolution because it costs to sign up
                Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                ^If you have datasheets not listed PM me

                Comment


                  #9
                  Re: Sony DE-425 volume motor/knob

                  If you use the correct model number you will find your service manual, free.
                  The RESITANCE of the control is 100K X6, The motor is not a stepper motor it is just a dc motor
                  Attached Files
                  Last edited by R_J; 04-05-2022, 05:02 PM.

                  Comment


                    #10
                    Re: Sony DE-425 volume motor/knob

                    yeah you're right. Sorry I haven't worked on this level of electronics in years. I mostly just replace caps

                    odd I could not find that schematic. Guess you know more places to look
                    Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                    ^If you have datasheets not listed PM me

                    Comment


                      #11
                      Re: Sony DE-425 volume motor/knob

                      I use Google, The model number is STR-DE425, Enter this into google ... STR-DE425 service manual, the first return line is this: https://www.manualslib.com/manual/90...Str-De425.html

                      Comment


                        #12
                        Re: Sony DE-425 volume motor/knob

                        Originally posted by R_J View Post
                        I use Google, The model number is STR-DE425, Enter this into google ... STR-DE425 service manual, the first return line is this: https://www.manualslib.com/manual/90...Str-De425.html
                        I got that too but once you go through a number of pages it bumps the resolution down if you don't pay
                        Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                        ^If you have datasheets not listed PM me

                        Comment


                          #13
                          Re: Sony DE-425 volume motor/knob

                          Originally posted by Uranium-235 View Post
                          I got that too but once you go through a number of pages it bumps the resolution down if you don't pay
                          No it does'nt, you download the pdf, what site did you go to?

                          Here, this is what I downloaded from the link I posted
                          Or download it here
                          Attached Files
                          Last edited by R_J; 04-05-2022, 09:51 PM.

                          Comment


                            #14
                            Re: Sony DE-425 volume motor/knob

                            I must have gotten it from a different site
                            Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                            ^If you have datasheets not listed PM me

                            Comment


                              #15
                              Re: Sony DE-425 volume motor/knob

                              Ugh I'll just get one off craigslist. Them pot (china, with shipping, and the knob), I'll just find one on craigslist for $75-$100 I guess. Maybe turn this into a project

                              *I'll probably recap some of it

                              Thing about this amp is it is ballin' when it comes to music, not the best for TV
                              Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                              ^If you have datasheets not listed PM me

                              Comment

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