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4/00 UDC 3300 Controller Product Manual 267
Digital input board
Follow the procedure listed in Table 9-21 to replace the Digital Input
board—P/N 30756696-501.
Table 9-21 Digital Input Board Replacement Procedure
Step Action
1
Remove the chassis from the case. See Figure 9-1.
2
Remove the printed wiring boards from the chassis. See Figure 9-3.
3
Lay the boards flat and identify the Digital Input board. See Figure 9-4.
4
Remove the transformer plug from connector J9.
5
The Digital Input board is attached to the MCU/output board by three
mounting posts. Locate these posts under the MCU/output board.
6
Use small pliers and squeeze the ends of each post together and push it
up through the board. Remove the Digital Input board.
7
Orient the new Digital Input board onto the MCU/Output board and push
the mounting posts down through the MCU/Output board until they click
into place.
8
Replace the transformer plug onto connector J9.
9
Slide the printed wiring boards back into the chassis. Make sure the
connections to the display/keyboard assembly are made and that the
release points on the chassis snap into place on the printed wiring boards.
10
Reinstall the chassis into the case. Push in hard, then tighten the screw.