Table 7-19 Mcu/Output Board Replacement Procedure - Honeywell UDC3300 Product Manual

7.8 Parts Replacement Procedures,
MCU/output board
1/01
Follow the procedure listed in Table 7-19 to replace the following
MCU/output boards:
• Relay Output—P/N 51309401-506
Table 7-19 MCU/Output Board Replacement Procedure
Step
1
Remove the chassis from the case. See Figure 7-1.
2
Remove the printed wiring boards from the chassis. See Figure 7-3.
3 Lay the boards flat and identify the MCU/Output board. See Figure 7-4.
4 Each option board is held onto the MCU/Output board with three posts.
Locate these posts under the MCU/Output board.
5 Use small pliers and squeeze the ends of each post together and push it
up through the board. Remove the option boards present.
6 Remove the transformer connections to the Digital Input board and the
Communications board, if present.
7 Remove the Digital Input Board, if present. See Table 7-17.
8 Remove the Communications board, if present. See Table 7-18.
9 Replace the MCU/Output board.
10 Reinstall the Digital Input board, if present, onto the new MCU/Output
board.
11
Reinstall the Communications board, if present, onto the new MCU/Output
board.
12 Reinstall the transformer connectors to the Digital Input board and
Communications board, if present.
13 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.
14 Reinstall the chassis into the case. Push in hard, then tighten the screw.
UDC3300 Limit Controller Product Manual
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