Simplex clock

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Pictures taken February 19, 2015

Contact joemagiera@ameritech.net for any questions or feedback.


One side view, other side is matching.


Other side view, other side is matching.


Opening up, inside of unit.

Unit appears to be just two separate clocks, housed in one unit.

There are four wires the lead out of the whole unit. All four wires go into both units.

I don't see any other wires being shared directly between the units (besides the four that connect to the "outside world").


Close up of label.

I do not see any signs of a buzzer in this unit. Perhaps it is a generic label for models that do have some kind of buzzer.

I plugged in white/red wires (cluth magnet) and both sides of the unit did nothing.

I plugged in white/black wires (synchronous motor) and one clock (the side with the label) moved normally.

The other side (side without the label) "spun". As the second hand moved, the minute hand moved with it until it reached 12:00.

Then both clocks moved normally.

Note, even though they were both moving normally, they were not anywhere near in synch.

See the next two pictures after the picture immediately below, noting the silver labels. Do those labels indicate that one unit is the main/master unit and the other is a secondary/slave unit?

I then tried plugging in all three, white/black/red wires.

With this, both units "spun". The minute hand moved around with the second hand on both clocks. The clocks never synched up, they just both continued to spin.


This was on back side of one of the clocks.

This is the side without the label.

It looks like the silver sticker says "IO" (letter "I", letter "O") or perhaps "10" (number 10).

This is the side that "spun" with only the white/black wires (synchronous motor) plugged in.


This was on the back side of the other clock.

This is the side with the label.

It looks like the silver sticker says "II" (letter "I", letter "I"), or perhaps "11" (number 11).

This is the side that moved normally with only the white/black wires (synchronous motor) plugged in.


Contact joemagiera@ameritech.net for any questions or feedback.

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