
274 UDC 6300 Process Controller Product Manual 1/03
8.8 Parts Replacement Procedures, Continued
How to replace the
communications
option board
To replace the
• DMCS Communications option board (Part Number 30755408-503)
• RS422/485 Communications option board
(Part Number 30755865-504)
Refer to Figure 8-5 for parts location and follow the procedure in
Table 8-18.
Table 8-18 Communications Option Board Replacement Procedure
Step Action
1
Remove the chassis from the case. (See Table 8-14).
2
Remove the Bezel/Keyboard and Display board (See Table 8-15).
3
Access the Printed Wiring Boards (See Table 8-16)
4
Identify the Communications Option board and remove the two
screws that hold it onto the MCU/Inputs PWB
6
Assemble the new Communications Option PWB to the
MCU/Inputs PWB.
7
Assemble the interconnects to the MCU/Inputs board and
reassemble the boards reversing the procedure in table 8-16
8
Reattach the Bezel/Keyboard and Display board.
Continued on next page
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