Legacy NYC GP7 sound issues

Don't know but it might be the volume control on the engine. Maybe turn it back and forth a few times. Sometimes a shot of contact cleaner on the control helps.

This has first generation modular electronics. Besides cleaning the pot you could pull the boards and reseat. It also has chips in the audio board but you would need a tool to pull those out. The boards look identical to TMCC modular and the audio power board is in fact the same. If none of this helps you could actually swap out the two audio boards for their TMCC look a-likes (RS4 or RS5) to determine if a board is bad.

Pete

Pete,

I originally thought so too, because it's early Legacy, but I found the wiring diagram.  It's not modular:

If I'm reading this correctly there's not a typical modular motherboard and so no boards to pull and reseat.  Connectors yes; boards no.

Let's hope it's a dirty pot.

Drawing courtesy Zachariah.  See Early LEGACY Diesel (GP7) Wiring Diagram | zhubl.

Mike

Mike, here is the RS 5.5 board that is in that engine. Maybe the motherboard is new but the boards that plug into are all early legacy. R4LC, Audio power board and this Railsounds board.

Pete

Thanks to those who responded.  I tried the pot and after 6 or 7 rotations, nothing changed.

I also unplugged and reinserted the 3 boards several time but nothing changed.

I guess I will have to send it to be repaired.

Thanks,

Don

@Norton posted:

Mike, here is the RS 5.5 board that is in that engine. Maybe the motherboard is new but the boards that plug into are all early legacy. R4LC, Audio power board and this Railsounds board.

Pete

Thanks Pete for the clarification!

Here's what's clearly not obvious in the documentation for this engine: Unlike every other wiring diagram I've ever seen from Lionel, e.g. those in Supplements 1 - 47, this one doesn't show that the motherboard has other boards plugged into it (although the term "motherboard" would lead one to believe that it does so I should have assumed so).

Before I posted I did try to locate the motherboard itself in the Lionel parts system in order to add more light, only to find that it's not actually in the system.

Lastly I checked Rod's summary of motherboards and didn't find it there either:

  Updated Revised Version of Lionel Motherboard Connections PDF Available | Rod Stewart

It just goes to show that posts in this forum, and people like you on it, are critical at times for determining the real answer to many questions, especially when the formal documentation occasionally comes up a little short.

Mike

That wiring diagram does list a Mother board, and the title also states R4LC, which do comprise the modular set up.  It is always best to go into the Lionel Parts site with the model number to see what is specifically part of any engine. G