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TAB SumoBot Kit Repair — Parallax Forums

TAB SumoBot Kit Repair

ercoerco Posts: 20,256
edited 2014-02-03 20:12 in General Discussion
I just got a used one off Ebay. Onboard SMT BS2, no SMT LED lightup, no response to hails from the editor. Anybody with any relevant troubleshooting/repair experience, or should I return to sender? These are getting rare, so I wouldn't mind taking a shot at repairing it. IIRC there may be a Yahoo group for these bots.

Edit:There WAS a Yahoo group, but no more. http://forums.parallax.com/showthread.php/84199-Tab-Electronics-sumo-bot

Comments

  • Martin_HMartin_H Posts: 4,051
    edited 2014-02-02 06:51
    The lack of response to hails from the editor is the most important piece of diagnostic information. Did it come with the remote? If so then try initiating one of the built in programs on the Pic coprocessor. If neither works then my guess is the board is dead.

    BUT! The battery holders on these boards are amazingly tight and I've had the positive ends not touching the contacts. Make sure that they are engaged because the friction can prevent it.
  • GadgetmanGadgetman Posts: 2,436
    edited 2014-02-02 08:47
    Have you verified the voltage regulator is workiing?

    The smt BS2 should be a PIC16F57 (I think), and in the SSOP package, ( http://ww1.microchip.com/downloads/en/DeviceDoc/41208C.pdf ), and pins 1 and 14 are Gnd(first and last on one edge), and Vdd(5V) is on pins 3 and 4.
  • NWCCTVNWCCTV Posts: 3,629
    edited 2014-02-02 14:27
    Can you post a pic of the board? I have a couple Sumo BOT Boards I am not using. If one of them match up i can send to you.
  • ercoerco Posts: 20,256
    edited 2014-02-03 08:33
    Thanks guys, will check out your suggestions.

    Andy, thanks for your kind offer. I'll take a shot at troubleshooting this board first (and I can always return to Ebay seller). This is the best online pic of the board I found so far: http://canabots.webs.com/chessie.htm
  • Buck RogersBuck Rogers Posts: 2,185
    edited 2014-02-03 08:52
    erco wrote: »
    Thanks guys, will check out your suggestions.

    Andy, thanks for your kind offer. I'll take a shot at troubleshooting this board first (and I can always return to Ebay seller). This is the best online pic of the board I found so far: http://canabots.webs.com/chessie.htm


    Hello!
    erco, if that's what you have, and they match the photo, then who you have is old enough to (learn how to) drive. I saw the kits for sale in the Barnes and Noble in Forest Hills Queens almost every time I was in the area.

    It's related to the one that Parallax sells but only just.

    I agree with the others, see if the battery holder is working properly. Also see if there's some way of feeding it the voltage it needs off the board, and also just as carefully.
  • ercoerco Posts: 20,256
    edited 2014-02-03 09:05
    Yep, the battery holders are soldered in and the on/off switch works properly, getting voltage to the headers by the breadboard.

    Gotta dig deeper, next is Martin's "test the built-in" routines not using the BS2.
  • NWCCTVNWCCTV Posts: 3,629
    edited 2014-02-03 20:12
    Same ones that I have 2 of. Let me know.
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