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Proto 2000 BL2 install

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ON28:
When I plugged in a tested LM-3S to my working-on-DC DCC-ready Life-Like late release BL2, I could hear power to the motor but nothing moved. Couldn't do the auto current test, either. I had removed the factory light board and disconnected the factory light bulbs. Second try I disconnected the motor wire to the frame but I can see now that was a mistake as the motor is already isolated from the frame. Again, the loco worked fine on DC and the LM worked fine on another unit. Any ideas here are appreciated.

nodcc4me:
Did you see anything unusual with the HC’s voltage and current readings? I would remove the DCC socket and hardwire the module.

ON28:
Couldn't run the current test so no data. However, I disassembled the loco to clean gears and will likely hardwire.

G8B4Life:
I couldn't find a photo online of the BL2 circuit board however the symptoms you describe sound exactly like there is an RF suppression circuit built in to the BL2 circuit board. An RF suppression circuit has a inductor inline with the motor leads and a capacitor across the motor leads. These suppression circuits play havoc with LM's. We had a discussion on them here: https://rpug.pdc.ca/index.php/topic,295.0.html, and I posted a link to a Soundtraxx document on them here: https://rpug.pdc.ca/index.php/topic,846.msg6496.html#msg6496

Check the BL2 circuit board for RF suppression. The inductors will either look like big green resistors or a small coil of copper wire. The capacitor could be well, just about any small capacitor. If it's not RF suppression then we'll be back to square one but at least we can eliminate it.

- Tim

ON28:
Here's the BL2 board. Looks like standard resistors to me. The 8-pin plug was located at right.

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