Reply to "Lionel Radio boards"

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

@Chuck Sartor posted:
Actually the C07 has the marker light polarity reversed. Used in C420's and early Harriman 2-8-0's.

I think we need to clear up a misconception here.

The polarity that is reversed is the lighting outputs on pin-9-10 and 13-14. There is no "marker light" output from the R2LC/R4LC. On the R2LC-C07 version the lighting outputs are positive in respect to ground in command mode, and on the R2LC-C08 and later versions the lighting outputs are negative in respect to ground in command mode. Lighting outputs are full-wave track power on either of these versions in conventional mode.

In the C420's, the headlight outputs are used to drive the markers as well, and the reversed polarity required a wiring change to use the R2LC-C08 in that engine. This is also why the C420 markers would work in conventional mode and not in command mode.

9/24/218:55 AM

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