Second Serial Interface Board (International Only); Removing The Internal Modem - Compaq PORTABLE 386 Maintenance And Service Manual

To replace the internal modem option, reverse steps 1 through 8.
Chapter 8.10 Second Serial Interface Board (International Only)
To remove the second serial interface board:
1. Complete the preparation procedure (see Section 8.2).
2. Remove the rear panel (see Section 8.4).
3. Remove the 32 bit memory/modem interface board (see Section 8.8).
4. Press the top tab and disconnect the LED/speaker and keyboard cables from
the system board (Figure 8-19).