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Thread: Burnt my 7.5 Toast

  1. #1

    Default Burnt my 7.5 Toast

    Hey - Been lurking for a while but time to ask a few questions

    Ive ended up buying 2 CF7.5s because I think Ive burned one slice of toast

    Hooking up a switch I may have somehow shorted something, now the Activation switch pin seems permanently
    ON. I think I must have killed the input pin diode or something on the uC.

    The saber comes on when power is applied, but cannot be turned off again, so I think the pin is permanently closed.

    When I do a continuity test on my multimeter between the act. pad and the Gnd pad I get a signal. (with nothing soldered on the pads)
    Not sure this is right - I dont want to screw with the 2nd CF by checking on that one the same thing.

    If the pin is dead, is there any way I can salvage this board, by some clever hack or something?
    If not is Erv or TCSS doing any repairs these days?

    BTW this has all been to do a Tri-Cree conversion on my MR ANH Luke , so Ill post a thread separately on that soonish

    Cheers!

  2. #2

    Default

    Hello there, to a fellow Brit. Don't know about Erv but across the pond, Zook is one to ask about repairs. You will need a higher post count to PM him unless FJK can point him to you
    It might get a bit pricey to international ship back and forth though

    Good luck and MTFBWY

  3. #3

    Default

    Hello ! Thanks for the info Greenie.
    Maybe one of those guys will take pity on me and point me in the right direction !

  4. #4

    Default

    Since you're in the UK, I'd probably try to contact Erv. You can find his contact info on Plecterlabs.com. If he's not the one to contact for the UK, I'm sure he'll direct you to the correct person.
    We all have to start somewhere. The journey is all the more impressive by our humble beginnings.

    http://led.linear1.org/1led.wiz for the lazy man's resistor calculator!
    http://forums.thecustomsabershop.com...e-to-Ohm-s-Law for getting resistor values the right way!

  5. #5

    Default

    I know little about how the boards work but here's my two cents: It's possible that you have the board configured to use a normally closed latching switch, and therefore it thinks that it is on when the switch circuit isn't closed. I can test on my CF when I get home, but I'm almost certain that the activation pin is supposed to always be "on", because current is supposed to flow through it as soon as you connect it to ground. Check the config files to see if that is the case.

  6. #6

    Default

    The board comes with a default setting on the switch to be used with a latching style, as NanoRex mentions. You likely need to change that and the CF will work just fine, The correct setting for a momentary switch is "switch=2" in the config file.

    Got a question? Start Here. Have you tried the Thread Index yet? Most questions can be answered there.

  7. #7

    Default

    Hey thanks all for the suggestions. Sorry for my late reply on this.

    I actually have a second CF75 which is working perfectly so to sanity check it wasnt my latching setting,
    I swapped the SD cards around, and I still have the same problem.

    A continuity test from the Act pad to Gnd pad shows there is a short probably internal to the PIC on the board.
    Im not doing this on the good CF lol as I dont want anything to happen to that one

    Not sure what to do at this point. I guess the internal protection diode on the pin is blown - I must have shorted the pin to the main supply somehow while messing around wiring things up.

    Maybe someone in the know can answer but I'd would be lucky if one of the unused pins in the PIC was actually being monitored for act, I could potentially mod-wire it to the act pad.

    Cheers!

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