United Security Products AVD-45c Manual Pagina 285

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1/03 UDC 6300 Process Controller Product Manual 271
8.8 Parts Replacement Procedures, Continued
How to access the
Printed Wiring Boards
Follow the procedure in Table 8-16 to access the Printed Wiring Boards.
Table 8-16 Access the Printed Wiring Boards.
Step Action
1
Remove the chassis from the case as shown in Figure 8-1.
2
Follow the procedure in steps1A and 2A in Table 8-15 to remove
the Bezel/Keyboard/Display form the chassis
3
Remove the four screws (two on each side) that hold the two main
printed wiring boards onto the chassis (See figure 8-2 for location)
4
Use pliers to squeeze the ends of the spacer and push it through
the Power/ Digital I/O PWB. (See figure 8-2 for location of spacer)
5
Gently pull the MCU/Inputs and the Power/Digital I/O boards apart
out of the top and bottom interconnectors and lay the boards flat on
a non-conductive surface. (See figure 8-5).
6
Figure 8-6 identifies the location of the Printed Wiring Boards.
Figure 8-5 Printed Wiring Board Identification
DMCS or
RS422/485
Communications
Option Board
Option
Input Board
Power / DIO Board
MCU/Inputs
Board
22346
W1
J14
P14
Cable
Assembly
W1
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