Printed wiring board identification

Figure 9-4 identifies each of the printed wiring boards that can be replaced. Refer to this drawing when following the replacement procedures for each of the boards, since you have to remove all of them from the chassis to replace the one you want.

In order to lay boards flat, remove the transformer lead from the Auxiliary Output/Communications board and the Digital Input board.

Refer to the specific procedure table to remove the desired board.

2nd Input Board—Table 9-19

Power Input Board—Table 9-20

Digital Input Board—Table 9-21

Auxiliary Output/Communications Board—Table 9-22

MCU/Output Board—Table 9-23

Figure 9-4 Printed Wiring Board Identification

WG connectors

on Digital Input and MCU/Output boards

2nd input

Power/input

board

board

W1/W2

 

jumper

 

W2

 

1

 

Digital

MCU/

Aux.out/

input

output

communications

board

board

board

1

 

 

Note: the transformer connectors are polarized and will only go on one way

PROM

1 2-Pin Transformer connections are interchangeable. Either may be used on Digital Input Board or the second Input Board. 24279

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Image 277
Honeywell UDC 3300 manual Printed wiring board identification, On Digital Input and MCU/Output boards, Mcu, Prom