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

1

2

3

4

5

6

7

8

9

10

11

Action

Remove the chassis from the case. See Figure 9-1.

Remove the printed wiring boards from the chassis. See Figure 9-3.

Lay the boards flat and identify the Auxiliary Output or the Communications board. See Figure 9-4.

Remove the transformer plug from connector J8.

The Aux.Out/Communications board is attached to the MCU/Output board by three mounting posts. Locate these posts under the MCU/Output board.

Use small pliers and squeeze the ends of each post together and push it up through the board. Remove the Aux.Out/Communications board.

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.

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.

Replace the transformer plug onto connector J8.

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.

Reinstall the chassis into the case. Push in hard, then tighten the screw.

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Image 280
Honeywell UDC 3300 manual Aux.Out/ communications board