Wersi CD Series Technical Assistance

We met Karl many years ago in Lancaster, Pa. at a Wersi concert and workshop event. He just sent the following request via e-mail. Who can help?

I have a Wersi CD model Gala with Memory Tower & Golden Gate. It’s a bucket list item for this 84-year-old male NASA senior engineer retiree. As such, it’s an excellent on-going project to bring this instrument back to a playable lifetime of its own. The two previous postings with WersiClubUSA produced outstanding support: 

  1. Purchase of a completely functional Golden Gate via a German Wersi serviceman.
  2. (Most recently) An inside USA purchase of caged central plug-in circuit boards lifted from a functioning Gala.

To this point, Golden Gate boots up perfectly to its play screen and performs all functions generated by my touch screen commands. Likewise, the CD Gala portion sequentially flashes its LEDs until I push any button on the control panel. That is the end: no response from keys being depressed; central display screen lights but controlling the display is not evident because the intensity isn’t controllable, etc.

I expect to concentrate troubleshooting to ICs on the drawbar boards…(the controlling section). I replaced EPROM ICs on both the Master processor and co-processor (MST8 and CO 1) with those provided by Golden Gate. However, I have somehow mixed the 3-sets of these ICs. Thus, I plan to replace these trial/error.

Any comments, advice, or other support from club members will be appreciated, and I certainly thank you for the assistance to get me this promising point in my Gala Life quest.
Cordially,

Karl 

14 thoughts on “Wersi CD Series Technical Assistance

  • 09/02/2020 at 11:17
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    Hi, Is any one familiar with the amp. modification in the DX4/500, and CD xtra organs that have the LE-30 power chassis? It involves removing the two OM961 amp. modules from the heatsink and replacing them with TDA7294 amp. with a small circuit bd. One for each right and left channel. The TDA7294 is available on eBay, with a choice of wattage. I need to find out what input, inverting, or non-inverting to connect? And if the bootstrap wire is used? These wires are in the 9 conductor ribbon cable that originally plugged into the OM961 amps. I had a problem with the OM961 shorting out, one after the other. But I changed the two large caps. 4700uf last month and so far they have been working. But I would like to have a modification ready, if they short out again. Can any one help? Jack.

    Reply
    • 10/07/2020 at 12:42
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      Hi all, Problem solved. Tap into the audio signal from the pre-amp. at the center solder lugs on the volume control, in the LE-30 power chassis. Use shielded cable for this input . The TDA’s want raw audio signal, not treated signal from the PA-10 circuit bd. It works, and they operate cool, with a barely warm heatsink.
      I hope this helps, and stay well, Jack

      Reply
  • 08/17/2020 at 09:49
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    Hi Karl,

    There has to be some changes on resistors on the 8 Slave boards, AF40. You need EEproms for GG+ and GigaTower. The IC’s was available in two versions. With GG+ or without HD or Lifestyle.
    Should be the latest and last version.

    Reply
  • 08/07/2020 at 13:01
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    Is anyone familiar with the sequencer functions of the cd700?

    Specifically how-to open the sequencer in custom mode.
    I can open it but it is always a preset.

    Back to the manual

    Reply
  • 08/02/2020 at 09:54
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    Karl,
    I have a Gala with Memory Tower and Golden Gate, and live in Florida. I have the Golden Gate Owners manual, the CD Assembly manual, CD Owners manual, and the initializing diskettes. I got them from Chris before he quit the business.

    If you have those, it might facilitate repair.
    Wm.

    Reply
  • 08/01/2020 at 21:09
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    Does anyone know if Wersimusic USA (Ralph and Chris Conti) are still in business, alive, passed on, or what the status is in the USA for wersi organs, repairs, etc, etc, etc,

    Reply
    • 08/02/2020 at 07:36
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      Geroge,

      I can tell you Ralph and Chris are still with us. Pretty sure Chris has moved onto something else. I’ve reached out to get a better answer on “in business”. I think so, but he (Ralph) is tough to get ahold of.

      Reply
  • 07/31/2020 at 22:27
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    I am looking for memory cards for the cd series

    If anybody has any suggestions I welcome them

    Thanks

    Reply
    • 08/01/2020 at 08:26
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      EBay is your best bet; however most will come from Germany so you might have to translate some details on the cards. (Fortunately sounds and styles have similar spellings in a lot of languages)

      Reply
    • 08/08/2020 at 12:06
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      Hi Chris, I get mine from a store in Germany, info@orgel-studio.de Eva and Klaus Spath own it, very nice to buy from. Jack.

      Reply
  • 07/23/2020 at 17:57
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    Hi Karl, once you get your e-proms in their proper location, and you still have a problem. Try unplugging and then plugging in all the wire connectors, several times. You may already know this, by doing that it cleans the connector pins and sockets. I have to do this with my organs once and a while. Also, pull out and reinsert all the plug in circuit boards in the card rack several times also. And, make sure they are fully seated. I know they are hard to grip to pull out. Also, when replacing IC’s make sure that all the pins are inserted. I always wear a magnifying head set, to make sure of that. And, any time you remove and replace e-proms on the Master and Co-master you will have to re-adjust the display contrast, and re-program the drawbar percussion. Otherwise, you just hear strange noise. I hope this helps, and that you are successful, Jack.

    Reply
  • 07/22/2020 at 10:48
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    Hi Karl, Florian got back to me. He is not sure, but it’s stuck while booting the software. The lighting is normal for GG, and should skip to normal running after some seconds, on it’s own. But something is blocking this, therefore the organ won’t react to anything. I mentioned you may have mixed the e-proms, that may be your problem? He may get back to me with more info. Jack.

    Reply
  • 07/22/2020 at 09:13
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    Hi Karl, This is Jack from upstate NY. I have a Delta CDxtra, that had that same problem at one time. I don’t have Golden Gate, and added MT that I purchased from a friend. Make sure all your wire connectors are plugged in. Especially at the card rack and PS-21 power supply. I am trying to remember what my trouble was, other than my memory. First thought was a loss of 5 volts distribution from the power supply? Give me some time, and hopefully it will come back to me. I will also ask Florian Hutter, we are friends via email. Stay well, Jack.

    Reply

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