Forum Top Banner Ad

Collapse

Ebay Classic organs

Collapse

Announcement

Collapse
No announcement yet.

Help with Allen MOS 1 202C - S-100 amp and expression pedal problem

Collapse
This topic is closed.
X
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Help with Allen MOS 1 202C - S-100 amp and expression pedal problem

    Hello, Our not-for-profit organization that was just given an Allen MOS 1 Series 202C and a 32A/B Tone Cabinet pair. Everything works well and I've gone through and cleaned everything, cleaned all of the contacts and checked all of the fuses that I could see. I don't have a manual for this model and one of the S-100 amps is not working. The other problem is that the expression pedal has no effect on the sound level. I can hear out of one side just fine, but I can't change the volume with the pedal. Any help that you can provide would be greatly appreciated.
    Attached Files
    Steven C. Scott, Founder, CEO
    International Society for the Preservation of Historical Instruments
    2391 Porter Street
    Lebanon, Oregon 97355
    541.405.6334
    [email protected]
    www.ISPHI.ORG
    sigpic

  • #2
    The expression on these Allens is based on the light hitting an LDR (light dependent resistor). The amount of light that falls upon the LDR is controlled by a mechanical shutter in the pedal.

    The first thing to do is ascertain that the lamp in the expression housing is working. Looking at your photos, the lamp is connected the wires on the left side of the pedal.
    -Admin

    Allen 965
    Zuma Group Midi Keyboard Encoder
    Zuma Group DM Midi Stop Controller
    Hauptwerk 4.2

    Comment


    • #3
      Thank you very much for that information. It makes troubleshooting that aspect much simpler. The biggest issue we are having as an organization and repairing so many brands and models of organs, is getting manuals for them all. We have been lucky in some cases in getting PDF versions, but some are not at all common and trying to find manuals for them isn't easy. If you have any suggestions on the best/fastest way to diagnose the amp, I would be very appreciative.

      Best wishes,

      Steven
      Steven C. Scott, Founder, CEO
      International Society for the Preservation of Historical Instruments
      2391 Porter Street
      Lebanon, Oregon 97355
      541.405.6334
      [email protected]
      www.ISPHI.ORG
      sigpic

      Comment


      • #4
        There's a pdf here:
        http://www.organforum.com/forums/sho...l=1#post369701
        -Admin

        Allen 965
        Zuma Group Midi Keyboard Encoder
        Zuma Group DM Midi Stop Controller
        Hauptwerk 4.2

        Comment


        • #5
          Thank you, That will help. Best wishes.
          Steven C. Scott, Founder, CEO
          International Society for the Preservation of Historical Instruments
          2391 Porter Street
          Lebanon, Oregon 97355
          541.405.6334
          [email protected]
          www.ISPHI.ORG
          sigpic

          Comment

          Working...
          X