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268 UDC 3300 Controller Product Manual 4/00
Aux.Out/
communications board
Follow the procedure listed in Table 9-22 to replace the following boards:
• Auxiliary Output Board—P/N 30756687-501
• Auxiliary Output/RS422/485 Board—P/N 30756687-502
• DMCS Communications Board—P/N 30756690-502
• RS422/485 Communications Board—P/N 30756693-502 (Basic)
or P/N 30756693-503 (Expanded)
Table 9-22 Aux.Out/Communications 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 Auxiliary Output or the
Communications board. See Figure 9-4.
4
Remove the transformer plug from connector J8.
5
The Aux.Out/Communications 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 Aux.Out/Communications board.
7
If you are replacing a Communications Board, a new PROM is supplied
with the board. Locate the PROM (shown in Figure 9-4) and gently pry out
the old PROM. Orient the new PROM supplied and gently press into
place.
8
Orient the new Aux.Out/Communications board onto the MCU/Output
board and push the mounting posts down through the MCU/Output board
until they click into place.
9
Replace the transformer plug onto connector J8.
10
Slide the printed wiring boards back into the chassis. Make sure the
connections to the keyboard assembly are made and that the release
points on the chassis snap into place on the printed wiring boards.
11
Reinstall the chassis into the case. Push in hard, then tighten the screw.