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  1. #1
    3 Star Lounger
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    Unknown PC Board

    This question is probably not really for this BB as it is about a stand-alone PC board, but maybe someone can point me in the right direction.

    I have acquired a solenoid controller board UEL-A3-1009-B/L, no other information printed on it. I have searched this number on Google with no success. Can anyone tell me how to go about finding out something about this board, eg. data sheet, instructions for use?

  2. #2
    Uranium Lounger viking33's Avatar
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    Re: Unknown PC Board

    Michael,
    You have a tough one on your hands there. If it were a major manufacturer, there would most probably be a better ID & logo on the board. There have been SO many short production runs of small PCB's for SO long that finding who made the board and for what purpose is going to be a long and almost assurably an unrewarding one. You might try to see if NEMA has a web site or possibly the IEEE. This falls into the catagory of small manufacturers using their own "house part numbers" for boards and components, then never publishing the info to the outside world. <img src=/S/crossfingers.gif border=0 alt=crossfingers width=17 height=16>

    Bob
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    Re: Unknown PC Board

    I looked all over the Net and couldn't find anything close to those part numbers. Sorry.

  4. #4
    Uranium Lounger
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    Re: Unknown PC Board

    Are there any chips on the board itself that give you a model number that you could check? I've also had luck using the FCC ID if one is visible.
    -Mark

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    Re: Unknown PC Board

    The main chip is a 40 pin DIL from NEC, UEL-IRR002 107 (which I presume means it's designed to control irrigation systems) # 8621MX; I cannot find this on NEC's website.

    Other chips are (Motorola) MC140288CP / FF8724A, (SGS) SG3524 / 98723, and (Motorola) MC14051B / CP FF8726B; plus 3 7407 buffers which drive the display. Control is by a 5x4 keypad.

    Thanks for your help.

  6. #6
    Plutonium Lounger Leif's Avatar
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    Re: Unknown PC Board

    I can't find anything on the MC140288 - I'm not sure it is a true Motorola part number.
    The SG3524 is a switch mode controller chip, which could be stepping up the input voltage, stepping down the input voltage, or pwm controlling the solenoids to give a hard turn on then a low current holding voltage.
    The MC14051 is a CMOS analogue 1-of-8 switch.

    The UEL-IRR002 I can't find and could well be a custom chip - i.e. made for a specific customer with no information publicly available.

    FYI, Motorola CMOS parts are generally prefixed MC1 - the 4051 is a generic part number made by a large number of manufacturers. This would infer the MC140288 could be a generic 40288. Are you sure it isn't 4028B? - which would make it a (Buffered) BCD to Decimal (1-of-10) decoder. This would tie in with the 4051 in making the board either controlling multiple solenoids, or one with multiple settings.

    The FF8724A type suffix will be a date code, possible along the lines of
    FF=manufacturing plant code
    87 = year (1987)
    24 = week number
    A = could be anything.

    The 4051 and 3524 are still made and readily available, but if the NEC chip was 'something special' such as a microprocessor, the chances are it is now quite obsolete - mpu chips typically have a build life of 2-3 years. Considering the date code, it looks like you have something around 15 years old - really quite ancient in relative terms.

  7. #7
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    Re: Unknown PC Board

    It looks as if I have a custom chip and am not likely to find any data on it. $A0.50 wasted!

    Thanks to everyone for your help.

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