• Tech: EZSBC

    From LexingtonVAPin@lhammer610@yahoo.com to rec.games.pinball on Thursday, August 26, 2021 17:12:52
    From Newsgroup: rec.games.pinball

    On WPC89 boards, when subbing the EZSBC for the LM323, do you leave the
    heat sink in place?
    --
    http://orcalcoast.com/
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  • From Joseph 'Tony' Dziedzic@tony@dziedzic.us to rec.games.pinball on Saturday, August 28, 2021 12:27:23
    From Newsgroup: rec.games.pinball

    On Thursday, August 26, 2021 at 5:13:06 PM UTC-4, LexingtonVAPin wrote:
    On WPC89 boards, when subbing the EZSBC for the LM323, do you leave the
    heat sink in place?

    --
    http://orcalcoast.com/
    The manufacturer states a heat sink is not required to maintain the maximum output current of 3 amps AT ROOM TEMPERATURE; since the inside of the backbox is at a somewhat elevated temperature I retain the original heat sink as a safety precaution. Be sure to replace the #6 KEPS nuts (captive lock nuts) used to mount the original regulator with discrete #6 split lock washers and #6 nuts; the toothed lock washer of the KEPS nut can overlap components on the surface of the printed circuit board.
    Joseph "Tony" Dziedzic
    --- Synchronet 3.19a-Win32 NewsLink 1.113
  • From LexingtonVAPin@lhammer610@yahoo.com to rec.games.pinball on Sunday, August 29, 2021 12:58:12
    From Newsgroup: rec.games.pinball

    On 8/28/21 3:27 PM, Joseph 'Tony' Dziedzic wrote:
    On Thursday, August 26, 2021 at 5:13:06 PM UTC-4, LexingtonVAPin wrote:
    On WPC89 boards, when subbing the EZSBC for the LM323, do you leave the
    heat sink in place?

    --
    http://orcalcoast.com/
    The manufacturer states a heat sink is not required to maintain the maximum output current of 3 amps AT ROOM TEMPERATURE; since the inside of the backbox is at a somewhat elevated temperature I retain the original heat sink as a safety precaution. Be sure to replace the #6 KEPS nuts (captive lock nuts) used to mount the original regulator with discrete #6 split lock washers and #6 nuts; the toothed lock washer of the KEPS nut can overlap components on the surface of the printed circuit board.

    Joseph "Tony" Dziedzic


    Thanks Tony. I found the same thing for the KEPS nuts. I used a #6
    (small) tooth washer that does not extend beyond the nut. On one side, I
    could not get a nut driver on a regular nut because of the lack of
    clearance with a component.

    I thought about reversing the screw and nut on the board, but found that
    the nut crosses over other traces on the back of the board, so that was
    not a good idea. I was a bit surprised that only one screw is grounded (unless I missed it on the front of the board).

    I left the heat sink on just in case. I appreciate your response that confirms it is a good idea to leave it in place.

    Larry
    --
    http://orcalcoast.com/
    --- Synchronet 3.19a-Win32 NewsLink 1.113