Hammond Colonnade 333147 repair

[William VanNice]

Hello, I have just gotten my grandpa's old Hammond Colonnade and I am hoping to repair it and play it. I know it's not one of the classic tonewheel Hammonds but rather an LSI and that they typically grenade themselves with issues but I would still like to repair it. I am posting this a couple of weeks before I am home from college so I won't be able to start working on it until then.

I have a "beginners" knowledge of electronics and basic components such as resistors, capacitors, diodes, etc, and their functions. I am comfortable with soldering but my old "cheap" solder iron is probably not up to this task so any recommendations are appreciated. I am also very familiar with DVMs and how to use them.

I have acquired the schematics (shoutout to tuscondave)

The three biggest issues with the organ that I would like to get taken care of first are:

#1 On the lower keyboard, the "C2" note constantly plays, the note stops when all drawbars for the lower are pushed in. I would like to fix this first but have very little idea as to where to start. I have lifted the keyboard and the contacts underneath are not stuck.

#2 The Leslie appears to have "worn" itself out and does not stay level and so the foam scrapes against the plywood creating a scraping sound. I have thought about disassembling the Leslie and using spray foam to "reconstruct" the worn-out center. Would this work or is there a better solution?

#3 The piano "stop" (I'm not sure if that's what it is called feel free to correct me). does not turn off and so the upper keyboard is constantly in "piano". There is a connector that I unplugged that shut the piano off as a temp fix for now but I would eventually like to fix that but it's least on the list.

Any thoughts?

Thanks in advance -William

[William VanNice]

I have discovered the note issue to be the c2621 chips on the generator board, so i am currently looking for a donor organ but not having much luck.

As for the piano stop I believe has to do with the pro foot but not planning to dig any deeper into that since unless i can find a donor for the generator i will be scraping the organ.

[beyerjf]

I have a Colonnade that i have wondered around in. I also scrapped an Aurora Classic that had severe mouse damage. The 2 organs were remarkably similar in construction. I would say many parts were shared between the 2 models. Expand your search accordingly.
Here is one about 60 miles away. Offer to just get it out of there and it would probably be free. Good luck
Marketplace - Church organ | Facebook

[tucsondave]

How did you determine that the C2621 chips are defective?
The C2621 chips are better known as 440 keyers so include that in your search.

Only IC4 keys the C2 note.
The same input, pin 13, is also used for the upper manual sustain and percussion voices. If those are working on C2 then I doubt IC4 is defective. That can be confirmed by swapping IC3 with IC4. If C2 still ciphers then it is not the 440 keyer.

I suspect it is the sustain couplate # 66 causing the problem.

The organ is multiplexed. Pin 13 (C2) is used for upper drawbars, lower drawbars, upper percussion, strings, etc depending on the binary code sent to the key couplates. There is a truth table on the logic diagrams that show how each function is activated.

td

[William VanNice]

I determined they were bad by moving them around and different notes would play, however the c2 still played so i had assumed it was part of that issue, but after i put a new generator board in all the other notes where fixed however that c2 still plays. I will look into that sustain coupling in a few days after my college finals. Thank you.

[tucsondave]

For a soldering iron check out " KSGER T12 Soldering Iron Station" on Amazon.
It uses Hakko tips which are available in many sizes. I've had one for two years with no problems.
td

[beyerjf]

See if this guy has anything you might need

Marketplace - Treasure Trove of Hammond organ parts | Facebook

[William VanNice]

Yes i found him before i read your post, I managed to get everything he had for $150 which had two boxes of parts and another box of wiring. He had exactly what i needed too.

[beyerjf]

Cool. good luck...

[William VanNice]

I have put a new generator board in and that c2 note still plays. Are the odds of the same coupler on two different boards being bad that high or is there possibly something else at play? There is 23.9 volts at the C2L pin on the generator board so I assume it must be the coupling. I'm wondering if I can pull a sustain coupler from a different key on the old generator board and use it for that key. I don't see any reason this couldn't work but I'm also not in my area of expertise and am not very good at reading schematics. What should i do from here?

Also, a new problem arose in that all the keys have a slight distorted sound to them, however, if I switch piano solo the distortion is gone, not an immediate concern as I would like to get this note issue fixed first but that's next to fix.

[William VanNice]

I think i have decided just to retire the organ and scrap it. I don’t have the knowledge to repair it myself.