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Thread: What have I gothere?

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    Default What have I gothere?

    I opened up a Bachmann USRA Long tender to clean the contacts...I can't recall where I got this tender, or if it was new or used...got it on Ebay. I was surprised to find this board inside...what is it?

    tender.jpg

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    Looks familiar, not home so I cant look, but is that a plugin for a DCC chip?

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    Looks like a decoder board, similar to Spookshow's Mallet pic: http://www.spookshow.net/loco/bach2662.html

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    It's a DC board. On the left side there are numbered pads/holes for adding a hard wired decoder. The six pin plug most likely goes to the locomotive. It's very common for DC locomotives to have some kind of board inside them.

    Andrew

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    It's an anti white gears/axles cracking board.



    Doug
    Atlas First Generation Motive Power and Treble-O-Lectric. Click on the link:
    www.irwinsjournal.com/a1g/a1glocos/

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    Well, one thing is clear, it doesn't pick up juice for crap. Board must be fried.

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    The board looks fine to me. Those pins sticking up are the means of sending power to loco. Pin closest to right side of board (as you picture is orated ) is the right rail pickup or positive on dc. The left most pin is the left rail pickup. Look at
    the board with magnification each of the pins are labeled.
    Doug

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    the very short tabs are the reason for the a lousy pick-up.

    that is the idea some bright spark had and need to the strangled before he shared it.

    there are fixes.

    victor

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    You might be able to improve pickup by bending the spring contacts on the board (F & R, L & R) down a bit, to better contact the tabs from the trucks... I think the trucks for the 2-8-0 tender have longer tabs, but the truck wheelbase may be different.

    If you are going to use the board and add a DCC decoder, I think you also need to remove the copper "jumpers" that you can see on the left side of the board (as seen in your pics). Or, ditch the board entirely and hard wire the decoder (that's what I did in my USRA shorty tender)... However, you would need to fashion your own contacts for the truck tabs, or solder magnet wire to the truck pickup tabs and bring that up into the tender body to make your connections.

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    Quote Originally Posted by victor miranda View Post
    the very short tabs are the reason for the a lousy pick-up.

    that is the idea some bright spark had and need to the strangled before he shared it.

    there are fixes.

    victor
    I was thinking of gutting it and putting two copper strips down with little screws, basically turning it into a DC tender. But before I go through all that trouble.... did Bachmann make a DC only USRA Long Tender?

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    I messed around with it, it sort of picks up current now, but isn't quite 'there' yet. I see the issue, it is those short tabs. They bend up because the rivet is set back a bit, and then they don't make contact well. I may try to CA glue them right up to the edge of the cutout so that they don't want to bend upward so easily, forcing more contact on the pins.

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    the problem is the shortness of the tab. they have very little spring.

    Over normal track, one side or the other will lift the tender off one one tab or another.
    this is the same problem the CC 2-10-2 had.

    The fix is the strips you mentioned.

    my memory is the board has directional lighting... been a while, check that.

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    It's a standard circuit board from a Bachmann tender. It contains circuits to comply with European regulations and diodes and resistors for bidirectional LEDs.
    I use these all the time to upgrade other manufactures tenders and install dcc sound/silent decoders.
    If you wire them for DCC be aware that 7 is blue and 2 is yellow, not as some have described!

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    I did mess about with the tabs and got it to run a little better, but it's clear that it's never going to be worth much unless I do some serious modifications. And so I shall.

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