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RailKing/MTH SW8 stuck in RESET

Hi, I'm new to the forum, having just about retired and just surrendered my full-basement DCC N-scale layout, relocated, and set up an around-the-room O-gauge track in my new workroom.

The track is tubular 3-rail, a simple oval with one passing siding, and a wye at one corner just to turn locos. Divided into 6 separately controlled blocks. Powered with a refurbished Lionel KW transformer.

I am able to run several different MTH and Lionel locos on the layout. Never more than 2 locos on the layout at a time (one running, with maybe a second on the passing siding, not powered).

My separate workbench track is powered with a RailKing/MTH Z-750. 

OK, so I just got a pre-owned MTH SW8, Item# 20-2146-1, Atlantic Coast Lines #57, with ProtoSounds, but without the manual. With power, sounds come up but it won't move.

I found a manual online for a similar loco at: http://extranet.mth-railking.c...ction/30DL17098I.pdf and I have read and re-read the procedures, and have tried "SETTING THE ENGINE VOLUME", Feature 40 (to disable direction lockout), "UNLOCKING THE ENGINE", and Feature 18 (total reset).  I get all the Clinks and Clangs as documented, but cannot seem to get out of RESET.

The loco recognizes and responds to some of these Feature commands (eg, SETTING THE ENGINE VOLUME works just fine), but I'm at an impasse: the section about "UNLOCKING THE ENGINE" says to do the steps while the loco is moving, which is a "Catch-22"...

I found one other thread in the forum related to this situation: https://ogrforum.ogaugerr.com/...-stuck-in-reset-mode, but I found no relief. In fact, I got a bit confused by the talk about transformer wave-forms, of which I know nothing, and less about how to apply that info...

So, two questions:

1. Lacking a manual, can anyone confirm that I'm using the right Feature numbers? I'm thinking that maybe this loco has different numbers... IOW, is the manual I found appropriate for this loco? (If not, where can I find the right one? I could not find one on the MTH website.)

2. Will I need to open the loco? I have never opened an O-gauge loco, and would appreciate guidance as to procedures and what to look for. (I've installed about 300 DCC decoders into N-scale locos, but O-gauge is an entirely different operation, and I'd rather not mess things up!)

I appreciate any help offered!

Thanks, -John

Original Post

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

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