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  1. #1

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    RC Car Repair

    My parents recently gave me a box of my old toys that had been sitting in their attic... guess they wanted me to move it to my attic now that I've got one :-)

    In any event, one of the greatest treasures I found in the box is an old 6V Tyco R/C Ricochet.

    [youtube]http://www.youtube.com/watch?v=zvQPKZT92vU[/youtube]

    I remember having more fun with this car than *any* other RC car I'd ever played with. Idrove that thing (as the commercial implies you should) like I hated it, and it would take it all and come back for more.... for about two months

    Sadly, one day Idrove it through a puddle that was just a little too deep. It started going in circles, and before I could get to it to turn it off, The one wheel just stopped as if the motor had burned out. I must have put it in my room and forgotten about the whole ordeal.

    Now it's 15 years later. I have a brand new 6V battery pack, and only one of the wheels will spin. I'm a bit of a tinkerer now, so I decided to take it apart and Ithink I found the problem. There's a green plastic rectangular part on the main board that has a brown circle on it, like someone burned it with a soldering iron. I imagine that in the time the tire was spinning full speed it got hot and melted.

    I've come here to see if anyone has any suggestions. I don't know of anyone in my corner of the world (Americus, GA) that works on RC Cars, and I can't find any documentation about the circuitry (or even the car itself). All I can find are the original commercial and this forum. Can anyone help?

  2. #2
    klaymon's Avatar
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    RE: RC Car Repair

    Can you post a picture of the suspected burned part?  Maybe we can I.D. it.

  3. #3

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    RE: RC Car Repair

    Sure. I didn't think to take pictures when I had it open, so I'll have to strip it down again. I'll have pictures in an hour or so (I'm at work now).

  4. #4

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    RE: RC Car Repair

    full quality pics are here: http://picasaweb.google.com/nova20/RicochetProblem

    Here's the back of the board (click for bigness):


    In the lower right there are 4 sets of 3 connection points (right above the red wire). The problematic part is connected at the set of 3 in the upper left of those 4. It seems to be in line with the orange wire.

    Wire layout:
    white - battery
    yellow - motor 1 (works)
    green - motor 1 (works)
    orange - motor 2 (bad)
    blue - motor 2 (bad)
    red - battery
    purple - antenna

    Here's a close-up of the part itself. Looks pretty nasty (click for bigness):


    Camera was too close to focus on it, so here's a wider shot (click for bigness):


    The text on the part:

    NEC
    B2772 Q
    B772 Q
    M 72

  5. #5
    klaymon's Avatar
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    RE: RC Car Repair

    It's a transistor. I've found some possible matches:

    http://www.newark.com/stmicroelectro...tor/dp/38M2093
    http://www.mouser.com/ProductDetail/...9LqplOmLibqLc3

    Your part number threw me. After I looked at the pictures close up, I saw it was B772. You can put that in the search box on those sites and pull up the rest of the hits. Looking at the back of the board, the only thing Ican suggest there is to maybe resolder the green wire. That joint looks a little iffy.

  6. #6
    The_Collector's Avatar
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    RE: RC Car Repair

    That older stuff had decent boards, that were actually repairable. Heck, they even indicate Emitter-Base-Collector locations. Just pay attention to that when replacing the part.
    Carry the fire. There\'\'ll be another time.

  7. #7

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    RE: RC Car Repair

    Thanks! I don't know where that extra 2 came from (I corrected it in my post). I've ordered the part, and it looks like Ihave another excuse to practice my soldering skills.

    Wish me luck! I'll let you guys know how it goes.

  8. #8

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    RE: RC Car Repair

    Got the part in today and got all excited while I pulled out my soldering tools... desoldering braid, iron, and solder. Honestly I think I did a fairly good job, but sadly it didn't do the trick. The damned wheel just won't turn. I even took the part back out, turned it around, and put it back in. Nothing. It's possible I damaged the board with my 30W iron... but Idon't think so.

    In any event, here's some pictures (as before, click for bigness)

    New part in place:


    On the other side, you can see my horrid soldering job. Actually, it's not that bad, there's just flux all over the place. How do I get rid of that stuff?


    As you can see, I also re-soldered the green wire, but I think Imade it worse. However, that wire goes to the other motor (and works fine), so I'm not complaining.

    Anyone got any more ideas? I'd restart from the ground up with all new parts, but I'd have to use the existing board (unless someone knows where I can get a new one).

  9. #9

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    RE: RC Car Repair

    Holy crap, I had this truck. My mother got it for me as my last christmas present at home as a kid (17). I jumped that thing of the house and everything else I could and never broke a thing. Stopped running it do to the battery crapping out on me..
    Wonder if it's in her attic??[&:]
    Thanks for the 15 year flashback..
    Keep dreaming

  10. #10

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    RE: RC Car Repair

    Has it really been 15 years since this thing came out?

    Damn, I'm old. That was literally half my life ago.


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