Daktronics P1152, Руководство пользователя

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Troubleshooting
6
Problem Possible Cause Solution/Items to Check
Display works, but some
LEDs do not light or they
blink
Bad connection
Verify the connector on the back of the
digit circuit board is secure.
Bad digit or driver
Exchange the digit or driver with a
working one of the same part # to verify
the problem. Replace if necessary. See
Replacing Digits (p�6) or LED Drivers
(p�6) .
Display works, but some
digits do not light
Bad digit or driver (see solution above)
Incorrect sport code (see solution on previous page)
Incorrect driver address (see solution on previous page)
Component Location & Access
Reference Drawings:
Mechanical/Electrical Specs- TI-2002 .............................................................. DWG-138314
To access the driver, digits, or other internal components, use a screwdriver to loosen the
two screws on the front of the display, and remove the front panel. Refer to DWG-138314
in Appendix A for component locations.
Replacing Digits
LEDs are embedded in a printed circuit board (PCB) that is mounted to the back of
the timer’s face panel. Do not attempt to remove individual LEDs. In the case of a
malfunctioning LED or digit segment, replace the entire digit circuit board.
To replace a digit:
1� Open the front access panel as described in Component Location & Access (p�6) .
2� Disconnect the plug from the back of the digit by squeezing together the locking
tabs and pulling the connector free.
3� Remove the nuts securing the digit to the inside of the panel, and then lift the digit off
the studs.
4� Position a new digit over the studs. Make sure the small plastic spacers are still in
place, and then tighten the nuts.
5� Reconnect the plug to the back of the digit. This is a keyed connector and will attach
in one way only. Do not force the connection.
6� Close and secure the access panel, then power up and test the display to verify the
issue has been resolved.
LED Drivers
Reference Drawings:
4 Column LED Driver II; Specifications .............................................................. DWG-123783
The LED driver performs the task of switching digits on and off within the display. For
detailed descriptions and pin-outs of the driver jacks, refer to DWG-123783 in Appendix A .
When troubleshooting driver problems, two LEDs labeled DS1 and DS2 provide the
following diagnostic information: