Reply to "tmcc f-3 problem"

PaperTRW posted:

gunrunnerjohn posted:

Does this help any?

While it's better than nothing, it's the wrong version of the board and also the wrong wiring configuration.

Hotbox posted:

Fixed the backup light problem. Whoever owned the diesels previously, had somehow placed the backup light lead on pin 3 on the upper right connector. I moved it to pin F on the lower right connector. Refer to Johns LCRX diagram above or the schematic I referenced in Supplement 38, page S38:2-3. Both diagrams have the backup light lead on pin F. I placed the coupler 2 lead connector on pins C & D. That would be equivalent to the "R" coupler two pin connection point on John's diagram. My B unit (rear) coupler still doesn't work. You don't get the buzz sound that energizes the coupler solenoid but I do get the railsounds swooosh. Checked the coupler leads for continuity. I'm reading about 8 ohms which I guess is about right for the coupler coil.

Glad to hear the light has been fixed.

Your other problem is where you've hooked-up your ElectroCoupler -- the wiring between the two versions of the LCRX is NOT the same. For your unit, hook one coupler wire to Pin D. Connect the other wire to Ground (or Pin K).

Here's the rundown for the nine stick-pins on your board:

C - Front Coupler
D - Rear Coupler
E - Front Light/Cab Light depending on wire jumper
F - Rear Light/Strobe Light depending on wire jumper
B - Open for Front & Rear Directional Lighting/Jumper to Pin L for Cab/Strobe Light functionality
J - Center Rail pick-up
N - Program-Run Switch
L - Program-Run Switch/Jumper to Pin B for Cab/Strobe Light Functionality
K - Ground

Unfortunately, the Lionel listing on their website is wrong, as the 610-8124-110 is the earlier version of the board. The correct board for your Milwaukee B unit is 691-PCB1-00E, but those aren't currently available from them. (And that might explain why they list the earlier board, as they have those in stock.)

TRW

Yup, we are in sync.  Was just about to do that after checking that the coupler was OK and I have been referring to the Supplement 38 wiring diagram and it shows the coupler connected that way with the LCRX that I now have installed in my B unit. It's not the correct wiring diagram that went with my original B unit 6-18139, but there is no wiring diagram in the supplements for the 6-18139 Milwaukee B unit. So I use pin D for power to rear coupler and tie other lead to ground in the wiring harness. Here is the wiring diagram that now works for my B unit and LCRX combo. It shows the proper connection for the backup light too - pin F.

Thanks for the help!!

I'll make the wiring switch after I eat some lunch and report the results.

Ken