Daktronics TI-2025, Руководство пользователя

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Troubleshooting
5
Component Locations & Access
Reference Drawing:
Schematic: TI-2025/26 (120VAC) Segment Timer ........................................... DWG-274184
Component Location; TI-2025/2026, Segment Timer ..................................... DWG-278310
DWG-278310 shows front, back, and side views of the display along with the location of
vital components and the location of the hardware used to attach those components.
To gain access to the internal components of the display, simply remove the screws
securing the front or rear panels. DWG-274184 illustrates the schematic diagram of the
power and signal input wiring.
Replacing Digits
LEDs are embedded in a printed circuit board (PCB) that is mounted to the back of
the timer’s face panel, as shown in Figure 4 . Newer weather-sealed digits consist of a
digit circuit board mounted to a black polycarbonate tray and encased in protective
gel, as shown in Figure 5 . 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 back panel as described in Component Locations & Access (p�5) .
2� Disconnect the plug from the back of the digit by squeezing together the locking
tabs and pulling the connector free.
3� Use a 9/32" nut driver to 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 rubber side of the rubber-backed
spacers are facing the digit circuit board before tightening the nuts. Weather-sealed
digits do not require these spacers.
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 back panel, then power up and test the display to verify the
issue has been resolved.
Digit Panel Digit
Nut
Power /
Signal IN
Stud
Digit Panel Digit PCB
Nut
Power /
Signal IN
Stud Spacer
Figure 4: Digit Panel Assembly
Digit Panel Digit
Nut
Power /
Signal IN
Stud
Digit Panel Digit PCB
Nut
Power /
Signal IN
Stud Spacer
Figure 5: Weather-Sealed Digit Panel Assembly