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User Guide
12
Step 2: Change the Internal Jumpers
Skip this step unless
• you have an MT5634ZBAV and intend to add a monophonic exter-
nal speaker. (This step is not required for stereo speakers.)
• you intend to use your modem on a leased line.
If either case applies, you must open the modem and move one or
more jumpers on the modem’s printed circuit board.
Caution: The circuit board can be harmed by static electricity. Before
you open the case, touch a grounded object such as a water faucet to
discharge any static electricity in your body, then touch the metal shell
of the modem’s RS232 connector to ensure that there is no voltage
difference between you and the modem.
Warning: The following procedure must be performed by authorized
service personnel.
Opening the Modem
1. If the modem is connected, turn it off and remove all connecting
cables, including power and line cables.
2. Turn the modem over.
3. On the bottom of the modem are two screws that hold the case to-
gether. Remove both screws and set them aside.
4. Turn the modem over again.
5. Remove the top part of the modem case.
6. To close the modem, reverse steps 1–5.