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2 Installation
6
MultiModemZBA-V-V92 User Guide
Step 2: Change the Internal Jumpers
This step is required only if:
Ö You intend to use the modem on a leased line.
Ö You intend to add a monophonic external speaker to your modem with the voice option. No
changes are needed for stereo.
This will require you to open the modem and move one or more jumpers on the modem’s printed
circuit board.
Warning: The following procedure must be performed by authorized service personnel.
Caution: The circuit board can be harmed by static electricity. Before you open the case, touch a
grounded object, such as the metal chassis of your computer, to discharge any static electricity in
your body, then touch the metal shell of the modem’s RS-232 connector to ensure that there is no
voltage difference between you and the modem.
Opening the Modem
1. If the modem is connected, turn it off and remove all connecting cables, including the power and
line cables.
2. Turn the modem upside down.
3. On the bottom of the modem are two screws, which hold the case together. Remove both
screws and set them aside.
4. Turn the modem right side up.
5. Remove the top part of the modem case.
6. To close the modem, reverse Steps 1–5.