[Jukebox-list] Seeburg Switch Contacts

[Wesley Dean]

    Bob, the daisy chain circuit may be bypassed. The only thing it might do is try to write in two selections if two keys are pressed at the same time . This is of no consequence in home use.  This keyboard is pretty reliable because it carries 300 volts through the switches. However it is very low current, only which can be stored in the write-in capacitor. Of all the selection systems, these Seeburgs are the most gentle on the keyboard switches. Wes  
----- Original Message ----- 
From: "Bob E." <bobe at halted.com>
To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
Sent: Saturday, December 02, 2006 11:50 PM
Subject: [Jukebox-list] Seeburg Switch Contacts


> I'm still ironing the kinks out of this Seeburg DS-160, it's having
> selection problems in the write-in side of things.  I did the battery trick
> and it tried to play every postion, so the read-out side seems to work OK
> (and it was good for giving the recently-lubed mechanism a workout, too!).
> 
> I have the keyboard switch assembly (TES-168, Code A) out on the table, and
> I see that it has problems with a couple of left-bank letter switches (A -
> K).  As those of you who have worked on these know, when the switches are
> out, there is a daisy-chain of contact from one switch to the next right
> down the line, when you press a button it interrupts the chain at that point
> and connects to the normally-open contact for that switch position.  You can
> see that if there is a problem with the "pass-along" contacts, the switches
> downstream will all be dead.  I have a couple of these that are giving problems.
> 
> My question is, just how much voltage and current is being switched here?
> If there is a circuit problem, is it possible that one of these switch
> contacts will get "cooked"?  I have two that have darkened metal on the
> contacts, and they seem to not take well to being tweaked into a position to
> make better contact.  I don't know how much current it takes to "set" a
> toroid, but it sure doesn't seem like it would be enough to darken and
> remove the springiness from a slide-switch contact, does it?  I may need to
> look into getting another switch-bank from somewhere...
> 
> --Bob
> =======================================================================
> Bob Ellingson bobe at halted.com
> Halted Specialties Co., Inc. http://www.halted.com
> 3500 Ryder St. (408) 732-1573
> Santa Clara, Calif. 95051  USA (408) 732-6428 (FAX)
> 
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