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Thread: Board sensor reads 0

  1. #1

    Default Board sensor reads 0

    Hello,
    After putting in a new board sensor recently I have been getting low readings and eventually it went to a “0” reading and wouldn’t work at all. I took out the board sensor and the lens wasn’t dirty but I heard a little plastic piece fall when I took the board sensor out. I believe it was a little transistor but I’m not sure of the correct name for it. It was so small (about 1/8 of inch in size) I couldn’t solder the 3 points back to the circuit board so I tried something I seen on Youtube to bypass the missing piece I just put a blob of solder over all 3 contact points on the circuit board and put it back inand it works just fine again.
    My question is,
    is there any danger to running the machine like this and can this cause any other issues?

  2. #2
    Join Date
    Jan 2007
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    I don't recommend putting solder over the 3 contacts. Normally the transistors act as a switch. It will have a positive voltage on one contact and another going to a load of something they want to turn on. The 3rd contact is sort of the gate to turn on the switch. If you short them together then bad things can happen.

    Most of the parts have a white silk screened rectangle around the parts so you can see if one is missing.

    Since the part fell off you could post very clear pictures here of the part and the board with the missing part then call LHR... Being a Friday better call fast...

    AL
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  3. #3
    Join Date
    Nov 2008
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    Yes, lets see a picture of that!

  4. #4

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    Click image for larger version. 

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    Bottom left is where the solder was applied. As for the piece that was there I accidently blew it somewhere off the table with the air hose and it will most likely never be found again.
    My thought was on this that I was already going to have to buy a new board sensor so what do I got to lose. And then after I put it in and it worked perfectly I started wondering why that piece was there in the first place and was starting to get nervous that I can damage something else in the machine.

  5. #5
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    Nov 2008
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    Notice C6 has also been scraped off of the board. A miracle that it works. Thanks for the picture. I have some old sensors I will now play with.

  6. #6

    Default

    I didn't even realize that C6 was gone too. Honestly nothing touched any pieces on the circuit board when installing this. I'm not sure why the pieces would fall off or where the other one (c6) went for that matter. I've taken out and put in the board sensor at least 50 times. Since day one board sensors have been an issue on my machine, usually just dust behind the lens though.

  7. #7
    Join Date
    Nov 2008
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    The C6 comes off easily because the plug scrapes it off. I have two like that. One has to make sure the plug gets pulled away from the board as it comes out.

  8. #8

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    Would it make sense to have an option to not even use the board sensor? I can measure my work piece accurately and tell the machine where the center of the project is. I'm really just thinking out loud. Is that something that has ever been discussed around here and is it a bad idea?

  9. #9
    Join Date
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    Just guessing, I would bet that the transistor just turns on the IR LED's and now they are on all the time. A Camera with IR Mode could tell.... Never looked at my board sensor to see if it was off until needed. Curious what the board sensor reading is with white paper now?

    As for the need... Finding the board edges, all 4 is a important function.

    Good Job

    AL
    Favorite Saying.... "It's ALL About the Brass Roller"..... And "Use MASKING TAPE" for board skipping in the X or breaking bits.

    Follow ME on Facebook http://www.facebook.com/pages/Accoun...50019051727074

    www.PoconoDigitalWoodshop.com

    www.AccountabilityTag.com


  10. Default

    Hey Al,
    I checked the board sensor reading with white paper and it now reads at 77. I realize that's quite low and I'm going to order a new board sensor but at least its good to know you can run it like this when in a jam if necessary.

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