Having intermittent problems with my Lionel 777 Commodore Vanderbilt engine's sound system. SOunds of steam and chugging are fine, but I lose the whiistle and bell sound. Tried reassigning the engine number, turning power on and off, nothing works.
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Other engines work fine with your Command remote (rule that out)? If so it could be a board issue.
I have one RS 2.5 board like that also. Asked Lionel for some technical insight on the issue and unfortunately they don't have records to help be identify the defective components.
You can try pulling the PLCC chips with the proper too and reinstalling them. If that doesn't work, you may need a replacement board. Mine responded to all the typical sound functions but no bell or whistle. Something in the DC offset detection circuit failed.
You can try conventional (No TMCC signal on track) to see if it works. G
Do a reset of the engine, that usually fixes all of my TMCC quirks.
gunnerjohn was kind enough to give the steps to me once:
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