Full organ full time (Hammond L-100)

[BaconByte]

A coworker of mine has a Hammond L-100 which he dropped off at my house. He has a problem which has me mystified.

All of the presets are full organ with minor alterations that sound like the presets with full organ. With the drawbars selected one drawbar controls many unison harmonics. So it sounds like the 8' is also controlling the 4' 2' and 1' drawbar. No precussion that I can identify but there may be an electronic problem he missed.

Before he took it apart, replaced all of the caps on the generator and rebuilt most of the electronics and then put it back together.

I'm wondering if he missed something that I'm just not seeing. It has me shocked as I cant really understand how this is happening unless there is one thing I'm missing.

-Bacon

[enor]

Is the main ground wire from generator to manual assembly in place?

Since the drawbars in the L-100 aren't "multi point switches" as in the bigger models, but rather "volume control potentiometers"; a bad ground could cause them to malfunction.

Check (specifically) the ground connection to the "zero bus" of the drawbar assembly.

[BaconByte]

That was it. The ground wire was snipped off.

Now on to the next problem which will be easy.

When putting it back together he plugged the power into the percussion switch plug and sent B+ voltage where it shouldn't have been.
The percussion is no longer keying obviously.
Its an easy fix.