Seeburg Ls2 Gem and SSU4 stepper.

I have connected the stepper to the Gem as per the manual. The signals reach the stepper, the mech scans and nothing is chosen. Also, no selections can be made at the jukebox itself. Am I missing a plug between the electrical selector and the jukebox keys? The manual does not show one as needed. Thanks.

I am somewhat confused--"the electrical selector", and the "jukebox keys" are the same item in my head ?
You should have about a three foot long 34 position (on both ends)--(Molex plug), cable, that should be run behind/under the UDPU-6, from the TES to the RCSU. The Tormat also has the same type 34 position Molex plug that should be plugged into the stepper, adjoining the first one.
Your RCSU must be operating correctly--both "step-up wheels" must "step up" for each selection made from your WOM.
Also, your RCSU must be set-up correctly, for the type of WOM you are using Ron Rich

"Roadwarrior" -Ron outlined the basics here.
If all is plugged as he described, the Write-in voltage is not being passed through the stepper to the Tormat
Start with checking-cleaning the pins on -all- plugs going int an out of the stepper.
The W-I pulse is paralleled into both the stepper and credit unit

Using this schematic: http://s1192.photobucket.com/user/Rob-N ... g.jpg.html You can trace out the W-I source and trigger voltage on both J3104 (credit unit) and J3105 (stepper)..

Since neither stepper of keyboard register selections, the most likely cause is poor connections on the plugs followed by something ground-out the W-I voltages.

Here is a simplified of the W-I circuits: http://s1192.photobucket.com/user/Rob-N ... v.jpg.html

Hover the mouse and click on the fourth button at upper right to enlarge pic.

As for the stepper operation itself, these units are close to fifty years old. One can not simply plug it in and expect it to work. Once properly serviced, steppers are fairly rugged and reliable, but the wheels and timing relay contacts must be setup and functioning properly to begin with.

Are you familiar with working on these items?

Rob/NYC

Ok, the first problem was that the stepper was missing the molex plug that went from the stepper to the selection keys. Got that fixed. I did as Ron suggested and I cleaned all the plugs and doubled checked my connections. Checked the wheels, oiled and they return as they should. " No more boring out of shaft" Lesson learned Ron. Now, it will play the correct letter selected, but no matter which number is selected, it will always play 7.

Well, in the machine the only thing that can cause this is the number stepper wheel getting stuck. Observing the stepper is key here.

On steppers set-up for consolettes the pulse train sends numbers first and the amount of pulses is inverse of the position selected. that is A-1 is the most pulses and V8 the least.

If you make sure that both wheels are "home" select V8 and see what happens.

Also, if that is a "universal" stepper -one with moveable taper pin wires on the wafers, check the wiring against the printing on the stepper cover.

It is remotely possible for the consolette to do this if something is jammed into and shorting a section of the keyboard contacts. Test by disconnecting, advance the wiper just to the point where credit is established, connect a continuity meter (or low voltage bulb) press V8 turn the wiper. "V8" should yield 2-break-then -one pulse.

Rob-NYC

Hi Rob,
FYI--all Seeburg steppers, from the RCSU-5, thru the SSU models are "Universal".
Ron Rich

Ok will do and report. Thanks. Alberto.

Hello eveyone. New problem. When I connect the stepper to the control board, the pawl reset magnet activates and will not release. I checked the stepper and found no broken wires or anything out of place. What is causing this?

Alberto,
What's a "control board" ??
Ron Rich

roadwarrior wrote:Hello eveyone. New problem. When I connect the stepper to the control board, the pawl reset magnet activates and will not release. I checked the stepper and found no broken wires or anything out of place. What is causing this?

You are most likely talking about the coil in the center that operates the "butterfly" that hold the pawls open and allows the wheels to reset.

On each stepper clapper there are two sets of small contacts that close when the clapper is pulled down. The set of contacts closest to the center hold coil on both the letter and number clappers are the ones that are involved here. Make sure they are open when there is no stepper action and clappers are at-rest.

Rob/NYC

The "butterfly" is open when there is no power. As soon as I turn on the jukebox, it clamps down and stays that way.

If the reset magnet is energized, this indicates either a short on the signal wire going to the WOM, or, as stated earlier, one or more of the step-up coil contacts, are closed, when they should be open--see the service manual, for proper adjustment-- Caution, Un-plug the RCSU, until you find, and fix that problem, or you will "melt" the reset magnet coil. Ron Rich

Ron, I didn't mention the signal line because all the SSU's have thermal cutouts if the signal line stays pulled down for more than 30 sec or so. Logical ...yes, but possibly I've assumed too much.

Rob

Rob,
SSU-3 and -4's, only, have that thermal. But I have seen those burned out--and/or, "adjusted" (OK- mangled), to the point of uselessness ( just guessing here, but I would bet this was done by one, or more, of your Geppetto friends !) Ron Rich

Oh, here we go again...blaming the Gepetto's....at least they deserve it.

I was given an SSU-2 (?) for use with the U-100 I had in 1985. It had a "stepper reset" button on a conventional thermal ckt breaker on the front panel. From what I recall, it was to open the signal line when it was pulled down too long.....Or am I remembering the wrong thing?

Rob