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  • Dynacord DRP 16 Digital Reverb

    Hi,

    I've an old Dynacord DRP 16. It works, but I think that it's time of some maintenance.

    Do you replace the electrolytic caps? at least for the power supply caps?

    And somebody can tell me what they are this trimmers?

    Thanks.


    https://i.ibb.co/VLMX5x2/IMG-20200806-210913519.jpg

    https://i.ibb.co/3FwCwxM/trimmers.jpg

  • #2
    Your staring point would be to get a service manual. That should tell you what the trimmers do.
    Experience is something you get, just after you really needed it.

    Comment


    • #3
      Well $4.99 is very reasonable considering I could not find one for Free 99.

      https://www.owner-manuals.com/DRP16-...-DYNACORD.html
      When the going gets weird... The weird turn pro!

      Comment


      • #4
        Originally posted by DrGonz78 View Post
        Well $4.99 is very reasonable considering I could not find one for Free 99.

        https://www.owner-manuals.com/DRP16-...-DYNACORD.html
        Thanks.

        Okey, on the service manual says:

        8.- Adjustment of level display:

        Set nominal input signal ( 200 Hz ), adjust R135 so that the 0 dB led just starts to light up.

        R135 is the trimmer near input.

        So, anybody can explain how to adjust this? and the level pot? max or min? 200 Hz with signal generator?

        How is the procedure?

        Thanks.

        Comment


        • #5
          Not to be an ass but if the unit works, I would suggest that you button it back up.
          As to the level display: 200 Hz signal is specified but at what input voltage level.

          Comment


          • #6
            Seems that 0 on meters would correspond to 390mVAC input signal (switch set to inst. level) or 1.23VAC input (with switch set to line level).
            https://www.manualslib.com/manual/38...15.html#manual
            "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

            Comment


            • #7
              These can help?

              Measuring Dates DRP 16 Entire Unit:

              2. Input and output voltages, with reference to modulation display 0 dB;
              tone and mix controls in middle position; output control full to right;
              measuring frequency 200 Hz; Service switch S 401 closed.

              a) inputs +- 15 dB
              Input control full to right, HI/LO setting pressed

              (input control turned down)

              Terminal front 100mV 3.3V
              Terminal back 100mV 3.3V

              b) input control full to right, HI/LO setting pulled out

              (input setting turned down)

              Terminal front 3mV 150mV
              Terminal back 3mV 150mV

              Comment


              • #8
                https://www.rsmanuals.com/3071/dynacord-drp-15

                https://mpe.berklee.edu/documents/studio/manuals/effects/Ev%20Dynacord%20DRP15/
                Ch. 13.0 Service - page 55

                1)
                https://manualzz.com/doc/3121466/dynacord-drp-10-user-s-manual

                http://pdfstream.manualsonline.com/f/f8225b5b-b2be-4916-9335-34e3cc9e6f2b.pdf
                Ch. 13.0 Service - page 55
                Last edited by vintagekiki; 08-08-2020, 08:57 AM.
                Who does not know and knows that he does not know - teach him Confucius)
                Who knows and does not know that he knows - wake him Confucius)

                Comment


                • #9
                  Thanks a lot, but I don't know how to start. I don't have much experience with calibration tools... You can help me?

                  Thanks again.

                  Comment


                  • #10
                    With all due respect I do not understand why users constantly mention maintenance, replacement (electrolytic) capacitors, adjusts trimmers if the equipment is working properly and not show a symptom of failure.

                    Digital processors are mostly complex equipment, which in the context of some serious maintenance implies technical knowledge and specialized experience.
                    Any intervention in terms of calibration in user or DIY conditions is not recommended, because the user does not have knowledge, technical experience and the required measuring equipment.

                    I speak for myself. Although I have 40 years of engineering experience, I know very well what I don't know, and I don't accept job which do not know.

                    The old technical rule says, if something works properly don't touch anything in it while it is working properly.
                    Before any intervention, you must have the DRP16 service manual in front of you in order to perform the complete Test Programs procedure.
                    For an example of the DRP15 "Test Programs" from page 62, learn what the Test Programs procedure involves.

                    If DRP16 is unreliable or defective, the safest and cheapest way is to find an authorized service center, because the service of that profile in addition to qualified personnel, also has appropriate spare components, which in normal sales are generally not available.
                    Who does not know and knows that he does not know - teach him Confucius)
                    Who knows and does not know that he knows - wake him Confucius)

                    Comment


                    • #11
                      Originally posted by vintagekiki View Post
                      With all due respect I do not understand why users constantly mention maintenance, replacement (electrolytic) capacitors, adjusts trimmers if the equipment is working properly and not show a symptom of failure.

                      Digital processors are mostly complex equipment, which in the context of some serious maintenance implies technical knowledge and specialized experience.
                      Any intervention in terms of calibration in user or DIY conditions is not recommended, because the user does not have knowledge, technical experience and the required measuring equipment.

                      I speak for myself. Although I have 40 years of engineering experience, I know very well what I don't know, and I don't accept job which do not know.

                      The old technical rule says, if something works properly don't touch anything in it while it is working properly.
                      Before any intervention, you must have the DRP16 service manual in front of you in order to perform the complete Test Programs procedure.
                      For an example of the DRP15 "Test Programs" from page 62, learn what the Test Programs procedure involves.

                      If DRP16 is unreliable or defective, the safest and cheapest way is to find an authorized service center, because the service of that profile in addition to qualified personnel, also has appropriate spare components, which in normal sales are generally not available.
                      With al due respects. If you don't want to help me. Why you are trying to upload manuals ( that aren't the DRP 16 in any case ) and you are hanging medals for your 40 years of experience in the world of engineering? Please shut up and don't reply any post! I only try to learn. And if you can't explain anything... please don't bother uploading things that you assume I can't understand and please don't reply my posts.

                      Thanks.

                      And always with respect.

                      Comment


                      • #12
                        I only speak for myself. I just wanted to help.
                        If your vanity is hurt, sorry. I may notice, I haven't quote any your post anywhere.

                        About DRP16 service manual
                        https://www.owner-manuals.com/DRP16-service-manual-DYNACORD.html

                        https://music-electronics-forum.com/forum/music-electronics/910754-dynacord-drp-16-digital-reverb?p=910769#post910769

                        I read it somewhere
                        The road to hell is paved with good intentions
                        Who does not know and knows that he does not know - teach him Confucius)
                        Who knows and does not know that he knows - wake him Confucius)

                        Comment


                        • #13
                          Yes, I bought the service manual for the DRP-16

                          I know that I have to send 200Hz signal to the input of DRP-16.

                          But I don't understand the following:

                          1.- The input potentiometer ( DRP-16 ), it need to put at min or max?
                          2.- Signal generator. 200 Hz. But how many volts?

                          The service manual only says this:

                          8.- Adjustment of level display:

                          Set nominal input signal ( 200 Hz ), adjust R135 so that the 0 dB led just starts to light up.


                          I think that I don't need an engineer carer for understand this...

                          So, this are my questions.

                          Thanks.

                          Comment


                          • #14
                            Since I don't have a DRP16 service manual, I will try to explain on the example of DRP15.
                            Find an analogy between the DRP15 and DRP16 terms or upload the DRP16 service manual.

                            It is assumed that all voltages on the analog part are within the predicted limits.

                            - Put all controls in position as it says on Argeements (DRP15 page 56)
                            - Connect the APS One generator to the INSTR input DRP15 and adjust input voltage on 390mV.
                            - Connect the PM2517X to the LO output DRP15 and measure the output voltage ~ 730mV.
                            And that's it.
                            Who does not know and knows that he does not know - teach him Confucius)
                            Who knows and does not know that he knows - wake him Confucius)

                            Comment


                            • #15
                              Dave, I think it's going to be really hard to help without seeing the manual. Without that we have no understanding of what is going on.
                              Experience is something you get, just after you really needed it.

                              Comment

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