Removing and Replacing Field Replaceable Units
3.16 Removing the DHW42 Asynchronous Communications Option
3.16 Removing the DHW42 Asynchronous Communications
Option
The DHW42 asynchronous communications option contains three components
that you must remove from the system enclosure as follows:
• A logic board (54-20662-01)
• An input/output cable (17-02942-01)
• One of the following input/output modules:
8 data-only line input/output module (70-28542-02)
16 data-only line input/output module (70-28542-03)
8 modem control line input/output module (70-28543-01)
To remove the DHW42 asynchronous communications option from the BA42B
Enclosure, follow these steps:
1. Remove the enclosure cover (refer to Section 3.1).
2. Remove the upper and lower drive-mounting shelf combination (refer to
Section 3.11).
3. Remove the logic board, the input/output cable, and the input/output
module according to the procedures in the following subsections.
3.16.1 Removing the DHW42 Logic Board
Caution
Static electricity can damage integrated circuits. Wear a wrist strap
and place an antistatic mat under the system unit when working with
the internal parts of the system unit.
1. Press the latch on one of the standoff pillars (refer to Figure 3–41) and
push up the corner of the DHW42 logic board until the DHW42 logic board
is released.
3–64 Removing and Replacing Field Replaceable Units
