Allen ADC2100 Swell Pedal Has stopped working...Help

[Jontb]

Hi everyone...in the past I've received great help from many of you with my 36 year old Allen ADC.
The swell pedal has stopped working (it is stuck 'open').
I can see a small light coming from the great expression pedal but none from the swell expression pedal.
Are these machines light dependent?
Can I replace the light myself?
I had to replace the lights in the tone card reader and its works fine thanks to help from this forum.
I hope this can be as simple and successful a repair as that. IF not...
Is there a place to buy a new expression pedal?
Any help is greatly appreciated.

Also, a different issue, in the piston combination action, the 8 Violas II always adds its self to every divisional and general, but goes off with general cancel piston the way it should.
How can I get the Violas to behave correctly?

Thanks in advance for your knowledge!
Jontb

[tucsondave]

The lamp is a #57x. It is in a holder that just snaps out of the side of the pedal housing but you may have to remove the pedal from the cabinet to get enough clearance.
Also note the black paint dot on the end of the old lamp. You must apply paint or nail polish to the new one in the same place.


If you have the DM capture system check the reed switches on the stop bracket with an ohmmeter with the power off. Make sure they open and close when you move the tab.

td

[myorgan]

How can I get the Violas to behave correctly?

Give them music and ask them to concentrate.

Sorry, I couldn't resist.:devil:

Michael

[tucsondave]

Give them music and ask them to concentrate.

Sorry, I couldn't resist.:devil:

Michael

I agree with Michael. Get the Violas under control. Then we can deal with the problem of too much sax and violins in the world. :->

td

[Jontb]

Thanks for your help with replacing the x57 lamp in the swell pedal...everything is 'swell' now.
About the violas stops that adds itself to every combo (but goes off with the general cancel the way it should),
I don't know how to follow your instruction with the voltmeter...
Where on these pictures would that be?
I know that this might beyond my ability to fix.
Thanks so much for your help. Jon

[tucsondave]

You need to set the meter to read ohms on a low range scale.
With the power off measure across the two reed switches (the green glass thingys) on the misbehaving tab.
With the tab in one position you should get zero ohms and infinite in the other position.
Be careful when probing the reeds, they are fragile.

td

[myorgan]

You need to set the meter to read ohms on a low range scale.
With the power off measure across the two reed switches (the green glass thingys) on the misbehaving tab.

Jontb,

Please forgive me for interjecting. In case you need clarification on td's post, in picture #4 of your last post, you have the best picture of the reed switches, just to the right of the magnet at the back of the stop tab. Had I not had to replace one on one of my organs, I'd be confused. Ingenious design, those little things! However, SO FRAGILE, as td said!

Michael

[Jontb]

Thanks Dave et al, I understand these tiny things are the reed switches?
If they don't read as they should (broken), is this something I can replace?
Where could I get this part?
Light bulb was easy to find... replacing all the lights in the card reader too .. but this?
You guys are amazingly knowledgeable!
Jon

[myorgan]

Thanks Dave et al, I understand these tiny things are the reed switches?
If they don't read as they should (broken), is this something I can replace?
Where could I get this part?

Jon,

Yes, those are the switches. I replaced a reed switch on one of the Swell keys on my ADC-4300, and it was fairly easy to repair if you feel comfortable with a soldering iron. The switch needs to be placed exactly correct to work, though. Mine had developed a hairline crack in the glass which caused it to fail (it's a sealed system). No one noticed at the previous location because it was the lowest note on the manual. My guess is that when a repair person raised the manual for some reason or another, a tool was forced against the switch and cracked it. For your repair, you may need to get better access to the switch, and the tech guys on here can provide better information about that. I know how I would do it, but don't want to steer you wrong, as I've never replaced a reed switch for a stop control.

As far as getting one, I have a favorable authorized Allen repair guy who will send them to me via mail as I need them. It doesn't make sense to have him drive 2-1/2 hours to perform a $1.00 repair. I'm sure Tuscon Dave will have better resources than I.

Have fun!

[tucsondave]

[ATTACH=CONFIG]15845[/ATTACH]
Thanks Dave et al, I understand these tiny things are the reed switches?
If they don't read as they should (broken), is this something I can replace?
Where could I get this part?
Light bulb was easy to find... replacing all the lights in the card reader too .. but this?
You guys are amazingly knowledgeable!
Jon

Those are the reeds. Michael may have a part number and source but if not you'll probably have to get some from Digikey or Mouser.com based on size.
Always buy extras.

"You guys are amazingly knowledgeable!"
You forgot good looking! :->

td

[davidecasteel]

And modest.

David