Skip to main content

I took everything off the mother board-RS boards, all the connectors, and removed the mother board from the tender frame.  I looked at it and don't see any burnt or loose connections.

 

IMG_6801

IMG_6802

 

I checked the two wires that mount under the board to the tender frame-they're tight and no frayed wires touching anything.

 

I reinstalled the mother board.  One by one, connected the wires to the board, each time turning on power afterward and listening for the hum.  No hum from the mother board.

 

UNTIL, I got to pin J1, the hum is back!  I checked it 3 times and each time it returned to humming. Here's a picture of the culprit!

 

 

IMG_6803

 

So, I guess I need to take the bottom of the tender apart and look for a fault.  

 

I still have no RS sound.  Only the hum.

 

If I have time later, I'm going to use my known good speaker and see what happens.  I wonder if I have more than one thing wrong with the sound?

Attachments

Images (3)
  • IMG_6801
  • IMG_6802
  • IMG_6803
Last edited by 86TA355SR

J1 looks like the AC input.  There really is nothing that should hum. Unless it is a transformer humming because of a AC short.

 

If everything is disconnected including all the harness except J1.  (NO boards installed on the mother board) Does it still hum?  If so, I would test that black rectangle on the second picture.  Top of mother board.  That may be a diode/TVS that is shorted and causing a transformer hum.  G

Last edited by GGG

7 MAR update:

  Bill Lewis (Boxcar Bill) was working on my FEF before he died.  His kind son, after some coordination, shipped it to our own GRJ. 

When John unboxed it he called me-the FEF had sound

It's unknown to GRJ and I what Bill fixed or what caused the problem.  John checked it, cleaned the pickup rollers, and tested it.  He found an issue with one of the tender wheels (GRJ-I installed the new one today) and the FEF arrived home last week.  It works perfect.

Thanks Bill and GRJ!  I'm very happy.

Here's a few photos-I forgot to video it!IMG_7837

IMG_7842

 

Attachments

Images (2)
  • IMG_7837
  • IMG_7842
Last edited by 86TA355SR

Glad to see this has a final solution, and it has been good information/learning for myself, am certain others have learned a lot, also.  I, myself, have not acquired any Legacy engines.  I have more than enough engines, as for now...LOL!!...   But, knowing the correlation between early Legacy engines and the TMCC system equipped items in good information to be aware of.  Always learning, never can know too much, and this, The Forum, is a great source of knowledge and ideas.

Jesse TCA 

Add Reply

Post

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

×
×
×
×
Link copied to your clipboard.
×
×