These are not standalone clock displays. They are driven by an external
controller over serial. If the controller is not integrated into the PSU,
then you are missing the external controller module.
Personally I would just design a completely new clock using the LEDs.
-Dan
On Thu, 31 Dec 2020, Jeffry P wrote:
I purchased a clock display system from a USPS auction about 20 years ago
and recently rediscovered it in my storeroom. There are 20 displays and a
power supply. The displays were housed in a metal enclosure that has a
window cutout for the LEDs. The window had a piece of red colored film and
the LEDs were behind. When I plug the power supply in it will light all 0's
and a decimal point (as seen in photos), but will not start keeping time.
I'm willing to send one of these boards( at my expense) to someone who can
help me get the thing keeping time again. I've attached a few photos with
descriptions of chips that are on the board and voltages measured at the
power supply connector.
Thank you, Jeffry
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