UDC-5212 and DTD-5225 Digital Time/Date Display Clocks Installation and Operation Manual 9
Chapter 1: UDC-5212 Universal Digital Clock
To do this, remove the 10 small screws along the outside edge of the
clock. Carefully lift the rear panel from the chassis, being sure not to
remove the panel as it will remain connected to the display assembly
and face.
Follow the two wires from the speaker-type terminals to their connector
on the PC board attached to the front chassis. The connector must be
removed and reversed. Normally, the wires on the connector are located
near the left side of the 10-pin header, at Pin 1. Reversing this will
relocate the wires on the connector to Pin 10. When completed, return
the rear panel to the chassis and refasten the 10 screws.
After completing this procedure, the rear panel speaker-type terminals
will output real time timecode when DIP Switch 4 is set to the
INTERNAL position. The clock uses the internal crystal for a timebase
when operated in this fashion.
Additionally, DIP Switch 2 must be set to the RUN ON SECONDARY
position. This disables the flashing colons.
DIP Switch 5 is used to select the output timecode format: either
SMPTE (non-Drop Frame) or EBU.
If EBU timecode output format is selected, the seconds LEDs will
switch to sweep display mode. To return to the single step seconds
LEDs, move DIP Switch 3 to the USE AUX OFFSET position.
Brightness Adjustment
The central digit’s brightness is incrementally adjusted by holding the
MANUAL SET and either the CW or CCW buttons simultaneously.
Holding MANUAL SET and CW increases the brightness one level
per second, while holding MANUAL SET and CCW decreases the
brightness. There are 16 levels of brightness.
To adjust the perimeter seconds LEDs, two single-turn variable resistors
are located behind the two small holes on the rear panel. A small
flat-blade screwdriver may be inserted to adjust the brightness of the
outer seconds LEDs and the inner 5th second marker LEDs. Turning the
adjustment clockwise (as viewed from the back) increases brightness.
To illuminate all the LEDs, press and hold both the CW and CCW
buttons for ten seconds. Re-power the UDC to return to normal
operations.
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