SSU4 stepper to sub for SSU3?

[wilitrun]

Hi all,
As some of you know I've been searching for a stepper for my SS160 for quite awhile, and finally found one locally for next to nothing - however it is a SSU4 stepper (the correct one for my juke is a SSU3). I've been studying the manual sections for both and they appear to be completely identical (the component location diagrams show the exact same components, terminal connections, and corresponding codes for both). So I'm wondering if there are any wiring connection differences between them to allow for the different Tormat types used on the SS160 and the LS1/2 machines?
If anyone knows that would be fantastic - I would really like to run my SC1 Wallbox with the SS160 and this is the last part of the puzzle for me. Thanks!

[Hildegard]

I found this general description in the "Seeburg Reference Book" Vol. 3 by Always Jukin:

"[...) The SSU4K can supply power for up to six wallboxes. For each additional six wallboxes, a Remote Power Supply Kit
(RPS8K-56) can be added. The maximum is three RPS8’s, for a maximum of twenty four wallboxes.
The stepper is normally set up for the Seeburg Consolette wallbox. Models SCH1-4 and SCH3-4 were supplied with the LS1. Previous models SC1 and SC3 could also be used. The SSU4 provided audio control signals for both the SC and SCH wallboxes.
The stepper could also be configured to work with the 3WA series wallboxes (to put in a location with the older wallboxes installed)."

I would understand that you can use SSU4 as well in your SS160.

[wilitrun]

May 26, 2024 18:06:05 GMT Hildegard said:

I found this general description in the "Seeburg Reference Book" Vol. 3 by Always Jukin:

"[...) The SSU4K can supply power for up to six wallboxes. For each additional six wallboxes, a Remote Power Supply Kit
(RPS8K-56) can be added. The maximum is three RPS8’s, for a maximum of twenty four wallboxes.
The stepper is normally set up for the Seeburg Consolette wallbox. Models SCH1-4 and SCH3-4 were supplied with the LS1. Previous models SC1 and SC3 could also be used. The SSU4 provided audio control signals for both the SC and SCH wallboxes.
The stepper could also be configured to work with the 3WA series wallboxes (to put in a location with the older wallboxes installed)."

I would understand that you can use SSU4 as well in your SS160.

Thank you for the kind reply.
I think I read something similar to that in the manual supplement for installing the SSU4K kit (pub. 317984)
I printed out and studied very closely the component wiring diagrams for the SSU4 and SSU3 against each other (the LS1 service manual is publicly available and the SS160 service manual was part of a package I bought from JukeboxArcade - note to anyone buying these packages that they're copy-protected and not printable by conventional means). Unfortunately the two diagrams have the components laid out in slightly different places so they can't be compared by superimposing - it took me about an hour to manually trace all the wire lines and make sure they all connect and go to the same places. I also studied the component reference numbers, resistance values where shown, and polarity of the caps - and they all seem the same. I haven't yet read completely through the manual subsections.
The one and only difference I could see in the two diagrams is that on the SSU3 there is a dotted line connecting the guide rollers of the S3200 start switch and S3201 transfer switch to their respective contact plates and step relay pole pieces. On the SSU4 only the step relay pole pieces and contact plates are connected by this dotted line. I assume it must imply a physical connection - but I don't see why the SSU3 would show a physical connection between the start/transfer rollers and their contact plates whereas the SSU4 does not. When I hold the SSU4's pawl reset magnet arm down to engage the pawls to the black wheels and toggle the step relay poles to advance the respective contact wheels, the start/transfer switch rollers follow the cam profiels on those wheels just as I magine they would on the SSU3.
So as to why there's an SSU4 and an SSU3 when they seem to be identical is beyond me - maybe it's just the "black cherry ice cream" paint colour the rest of the modules are painted on the SS160?! That's the only physical difference I can see. The SSU4 is just cadmium-plated if anyone cares.

[wilitrun]

The difference between the SSU3 and the SSU4 is that the SSU3 uses the bakelite A-MP 200837/8 tormat connector while the SSU4 uses a white plastic connector. So an adaptor cable would need to be made to make the steppers cross-compatible.

[Hildegard]

Thank you for letting us know.
I found two photos - one each for SSU3 and SSU4. I realized the connectors having different colours, but could not see if there would be another difference too.
So now I know more.

[wilitrun]

Here's an update.
After studying the wiring diagrams to make sure the SSU4 would work on my SS160 (the SSU4 was also part of an SSU4K universal stepper kit that could be retrofitted to a number of different jukes, even the 100 selection units with some modification) I made some adapter cables using the bakelite harness ends from a junk LPC480 and the nylon harness ends from a HLPC-1. I was able to verify their integrity by plugging them into each other and jumping my Tormat cables with them- everything still works. Now the hard part - shopping-up the SC1 and SSU4 since neither of them were verifiably working they can't be used to test each other - so diagnostics will be difficult if the recapping doesn't go well.
If anyone knows how to recap modules and has some advice for selecting appropriate electrolytics and foil caps some advice here would be very welcome. There are a number of .047 200V foil caps in this unit and I'm unclear whether to use the orange drops or regular electrolytics to replace them. Thanks!