Need Info on Electronic e-unit 610-8689-126

Well, if it has directional lighting, they didn't use it in the DASH 8-40, so I suspect it's not there.

Lionel 6-18216 Dash 8-40 Diesel Wiring Diagram.pdf

@GeoPeg posted:

One of the two 10-pin sockets has two jumpers in place – purpose? Some of the pins on the opposite socket have pcb traces running to them, but no jumpers are present, so they may serve some function? I was really hoping to get some directional lighting off this board, but don’t know if that was part of the design.

The purpose of the socket was to accept a daughtercard that was the earliest of early versions of TMCC. I personally have not seen the documentation or part numbers of such a daughtercard, but again, with some level of certainty, this is where the LCRU and later LCRU2 started from.

To my knowledge, no, there are not outputs in those pin headers- not in the sense that you are asking. Instead, those are INPUTS- specifically the directional control from again, a plug in TMCC radio receiver board from the earliest of "Liontech" days. EDIT- the "jumpers are connecting the F-N-R logic built into this board (chip under the regulator) to the motor drive section. When you plugged in the special digital upgrade tmcc receiver, likely it got AC track power, common, this regulated 5V for digital logic, and provided the pulsed forward or reverse motor drive signal in place of the jumpered F-N-R reverse logic.

maybe @Norm Charbonneau knows something? https://ogrforum.ogaugerr.com/...8#157406524839422998

Early LCRU from this topic https://ogrforum.ogaugerr.com/...-lionel-gg1-question

My own post from the past

@Vernon Barry posted:

Or maybe you mean the really early version???? https://ogrforum.ogaugerr.com/topic/lcru-e-unit-help

I personally have never seen the plug in daughtercard to make this TMCC.

More research:

https://ogrforum.ogaugerr.com/...7#157406524381225207

@gunrunnerjohn posted:

Well, not in this case unless the parts site is totally wrong!

Lionel 6-18211 Parts Listing

This model doesn't have the modular motherboard that allows you to use those boards.  This is the reverse unit they show.

All I can find today https://www.lionelsupport.com/...H-8-40B-4002-6-18211

https://www.lionelsupport.com/...ocuments/2718211.pdf

Another model using that same exact PCB https://www.lionelsupport.com/...el-Loco-8495-6-18566

Again, here is what I suspect: The original LionTech AC reverse unit was possibly intended and designed potentially to have a TMCC daughtercard.

Due to the complexities and cost of second PCB daughtercard, it never made it into actual production as a sold "production" upgrade kit.- I can not find evidence, pictures, or documentation of this after much searching.

The original LCRU is derived from that design, and used similar components, but was an all in one board design. Again, a single PCB and no extra connectors saves cost in manufacturing and was just the road that the manufacturing path went down. Still large through hole DIP processor. Also, processor is socketed

LCRX is of the same basic time period and similar design. Still through hole component design.

We know the LCRU2 was the next in the chain. Here we see a change to early surface mount chips rather than through hole.

Next was modular R2LC

Vernon and John, my apologies for the lengthy delay in responding - things have been at 6's and 7's around here. I really appreciate the info from you guys. I will keep an eye out for the never been seen, probably never produced, radio board that might have fit on top of this e-unit! In the meantime, it will assume duty as an ordinary e-unit!

George