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Difference in Rodgers organs

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  • Difference in Rodgers organs

    Could someone give some advice as to the difference between a Rodgers Model 835 Cambridge and Model 850? I know the Specs are different on paper, Fagot 16ft/Bombarde 16ft etc. Both models have 2 manuals and illuminated draw stops but I would think the circuits would be the same for keyboards and pedal board? Also looking for a repair manual for a Rodgers Model 835. Any assistance would be appreciated.

  • #2
    Based on an internet search the 835 is a PDI (digital) and the 850 is oscillator (analog). There would be no similarities in the electronics. If this is correct, then the 850 is considerably older.

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    • #3
      Thanks for the information. I thought the higher the number the later the manufacturing date. Still looking for a repair manual for the 835

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      • #4
        Ozzyorg39,

        That's the most confusing thing about organ model numbers. They do not correspond to years, technology, or size in any readily-observable fashion.

        You have hit on something, though. I know someone has done it for Allen organs, but I wonder if it's time to provide a thread about Rodgers Organ models and how to decipher one from another. Great idea!

        Michael
        Way too many organs to list, but I do have 5 Allens:
        • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony) / ADC-8000DKC
        • Lowrey Heritage (DSO-1)
        • 11 Pump Organs, 1 Pipe Organ & 7 Pianos

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        • #5
          The best reference for understanding in very general terms any given organ model is Jan Girardot's Electronic Organ Reference List. For Rodgers it will indicate the technology and rough date when it was first sold. I believe it is posted here somewhere.

          It is also located here, but I don't know if membership is required to access it: https://xa.yimg.com/df/electronicorg...&type=download

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          • #6
            Thanks, had a go at bringing up the info and downloading but all that appeared was a blank page.

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            • #7
              I found the link to an older version of Jan's list (R.I.P. Jan). It is located in this post: http://www.organforum.com/forums/sho...l=1#post332110

              The link to the Allen general list of all models is located here: http://www.organforum.com/forums/showthread.php?27617

              Unfortunately, Jan's list doesn't show some of the finer details (i.e. moving vs. static drawknobs, or illuminated drawknobs, etc.), but it is as complete as it could get back then. Hope this helps.

              Michael
              Way too many organs to list, but I do have 5 Allens:
              • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony) / ADC-8000DKC
              • Lowrey Heritage (DSO-1)
              • 11 Pump Organs, 1 Pipe Organ & 7 Pianos

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              • #8
                Unfortunately, there is little in the way of documentation on the Rodgers PDI organs, such as the 835. No "service manuals" as such, just individual schematics that are available only to techs on their private website. To make matters worse, almost every PDI circuit board went through numerous revisions and versions, so you just about have to be in the room with the organ and with the Rodgerstech website open on your computer to get at the schematics.

                And of course few of these boards are repairable anyway. They are highly complex, with large numbers of surface mount components. Most of the troubles with these organs are related to interconnects among the various boards, and to failures of certain socketed IC's on the encoder boards, as well as burned out lamps.

                Also, there was and is a HUGE problem with leaking and exploding capacitors in many of the power supplies and on certain boards. This is such a big problem, that we routinely replace all the silvery-blue caps in all assemblies whenever we recondition one of these organs. These caps inevitably leak, and often the leaked juice will destroy circuit boards, or sometimes even catch fire and emit a horrid smell and acrid smoke.

                So, your eyes and your nose may be the best troubleshooting tools!
                John
                ----------
                *** Please post your questions about technical service or repair matters ON THE FORUM. Do not send your questions to me or another member by private message. Information shared is for the benefit of the entire organ community, but other folks will not be helped by information we exchange in private messages!

                https://www.facebook.com/pages/Birds...97551893588434

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                • #9
                  Oh dear, this does not sound too good. The organ was given away due to water damage/humidity and this has caused corrosion. Thanks for all the advice we will have to see what the local techs come up with.
                  The local firm actually had some parts working again so we can only hope they will be able to do more in the future. All the thumb piston/preset lights are illuminated and only General Pistons 1 to 5 work on Memory 1 BUT toe pistons seem to work.
                  Once again thanks for your assistance.

                  - - - Updated - - -

                  Thankyou for the latest info and yes I did find a listing but few details are listed. That would be a Mammoth task indeed to make a detailed list

                  - - - Updated - - -

                  The Church has turned up schematic diagrams of parts of the organ so I guess they have been downloaded buy an authorised tech but who is anyone's guess.

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