Wurlitzer 2000 stepper issue

[nessler]

Hello,

Some time ago we bought a wallbox and connected it to the junction box.

It kicked off a whole series of unforeseen events, of which I have resolved nearly all of them.

However one remains: whenever I select a combination on the wallbox that includes the number "1", the corresponding plug on the drum doesn't pop out.

All other possible combinations work as they should.

I have been advised to clean contacts on the plate, check for continuity on the wires, all of those things I have done now but the problem persists.

Even re-aligning the plate so that the contacts should appear centered doesn't do the trick.

To the best of my knowledge the first brown wire, bottom left, is what should make the number 1 register.

I have continuity through the junction box, all the way up to the sockets on the bottom of the drum.

Is there anybody here who can shed a light on this, what am I missing here ?

This is the number stepper:

These were the contact plates on the inside before cleaning, they now are oxidatiation free:

And this is what happens when the selections are made on the wallbox:

[jukenorman]

I think the advice you have been given is sound. I am assuming that "1" selections work OK from the jukebox selection buttons, otherwise you would have said? The only suggestion I can make is to unplug the jukebox keyboard and then try the stepper to see whether something on the keyboard is pulling down the "1" signal from the stepper.
Norman.

[Ron Rich]

Hi Norman,
I don't know the "nuances" of WurliTzer's stepper circuits ( nor WurliTzers, in general), but from years of rebuilding Seeburg's units, I would assume that the stepper generates the selections without any regard to what is happening in the keyboard ? Ron Rich

[Ron Rich]

Guys,
Rob/NYC, has posted what I think makes a lot of sense, to me, on another forum--he states that there is a different time constant, for each stepper section in a WurliTzer stepper. (Seeburg uses the same one for both sections) To me, that would indicate, given the symptoms described, that either the contact energizing the time delay, or the cap holding that delay power, is weak, and not storing enough power to hold the relay with just one pulse ? Ron Rich

[jukenorman]

Jan 21, 2019 14:18:18 GMT Ron Rich said:

Hi Norman,
I don't know the "nuances" of WurliTzer's stepper circuits ( nor WurliTzers, in general), but from years of rebuilding Seeburg's units, I would assume that the stepper generates the selections without any regard to what is happening in the keyboard ? Ron Rich

He said he had continuity from the "1" number stepper stud out to the selection drum input; that and the number "1" button on the keyboard both interface the same selection coil - hence my thinking that a keyboard fault might be preventing the selection coil energising by pulling down the voltage?

[Ron Rich]

Hi Norman,
That #1 button should be open -- yes, if shorted somewhere, I suppoze so--- ?? Ron Rich

[nessler]

I have in the meantime cleaned all contacts, some had corrosion, and let the junction box dry overnight. I have replaced the caps some time ago, so I'm fairly sure the issue isn't there, although it is of course possible that the replacement I put in is not capable.

which would be a bit odd since all other selections go through, but who knows, might be.

Anyway I installed the unit again after cleaning the relay contacts, but the issue persists.
I'm taking it out again, see if the wipers make contact on the number 1 position, but after that I'm a bit at a loss I'm afraid.

I'll perform a test with the keyboard unplugged as well to rule that one out.

[Ron Rich]

PLEASE--sign your posts !
Do you have a schematic--if so, look at what holds the relay --should be a resistor/cap combo. Check the resistor for correct value. See which contacts "hold" that relay and check them without power, using an Analog, NOT "digital", meter. They MUST connect very well--less then a 2 ohm reading, when closed, lightly !! Ron Rich

[nessler]

I have a complete manual yes, and I'm in the process of adjusting all hold dogs, springs, relays etc.
I do need to buy some device that can measure the weight that is mentioned in the manual.

There's a pulse relay underneath the stepper that has dirty contacts, will take that apart tomorrow and do the cleaning act there as well.

I just performed a test with the keyboard disconnected, and the selections with number 1 still don't come through so there's no short there.

Thanks for the 2 ohm suggestion, will also be doing that tomorrow.

[jukenorman]

I'm still struggling to understand what could be the problem here but like Ron, I haven't a lot of Wurlitzer stepper experience. However I am soon about to do battle with a 2100 stepper so that may enlighten me a bit!
Norman.