Parts Replacement
21
Segmentation and Digit Designation
Reference Drawing:
Shop Drawings .....................................................................................
Refer to Appendix A
In each digit, certain LEDs always go on and off together. These groupings of LEDs are referred to as
segments. The Shop Drawings identify the driver connectors controlling the digits. The number displayed in
the hexagons in the upper half of each digit, indicate which connector is wired to that digit.
Replacing an LED Driver
Reference Drawing:
4 Column MASC LED Driver Specifications ...........................................
Drawing A-166216
Shop Drawings .....................................................................................
Refer to Appendix A
Drivers are mounted inside the display enclosure and typically behind a digit, but location and mounting
varies by model. Refer to the Shop Drawings for the location of the driver. All DataTime
®
displays are front-
accessible.
1.
Open the digit panel or display face panel as described in
Section 4.1
.
2.
Remove the cover from the driver enclosure.
3.
Label all cables before removing them.
4.
Disconnect all connectors from the driver. Release each connector by squeezing together the locking
tabs and pull the connector free.
Note:
When reconnecting, remember these are keyed connectors and will attach only one way. Do
not attempt to force the connections.
5.
Remove the screws, nuts, or wing nuts securing the driver to the inside of the enclosure.
6.
Carefully lift the driver from the display and place it on a clean, flat surface.
7.
Follow the steps in reverse order to attach a new driver.
In the display, the LED drivers perform the task of switching digits on and off. Refer to Drawings A-166216
for a complete listing of driver connecter functions and wiring pin numbers.
