Hardware Installation
Memotec Inc. 3-3
3.2 Installing the DSP module
This procedure must be followed to install a DSP module.
NOTE: This procedure does not apply to the SDM-9140, which uses onboard DSP
circuits for digital voice instead of a DSP module.
3.2.1 Opening the Chassis Casing
► To open the casing of the SDM-9120/9220/9230 chassis:
1. Wear an ESD (Electrostatic Sensitive Devices) wrist strap, and attach it to the ground
lug on the power supply at the rear of the SDM-9120/9220/9230 chassis.
See “Rear View of the SDM-9120” on page 4-3 or “Rear View of the SDM-9220/9230
UAC” on page 4-5 for the exact location of the ground lug.
NOTE: In countries where a 2-pin non-grounded power cord must be used, ensure that
the SDM-9120/9220/9230 unit is independently grounded with a wire from
Ground securely attached to the ground lug located at the rear of the SDM-9120/
9220/9230 chassis.
2. Ensure that the SDM-9120/9220/9230 unit is securely placed on a hard, flat surface,
with the port connectors facing you.
3. Turn the power switch OFF by pushing it to 0, and unplug the power cord from the
power supply.
4. Remove the cover of the unit, and depending on the model (SDM-9220 and SDM-
9230, or SDM-9120) do as follows:
For the SDM-
9220 and SDM-
9230
a. Remove the 3 screws that secure the lip of the cover to the rear of the unit’s
chassis.
Caution
Electrostatic charges can damage system components. Always use an
ESD wrist strap when accessing internal components of the unit.
Warning
To avoid electrical shock and damage to the unit, make sure that the
unit is disconnected from its power source before you access any of its
internal components. Use ESD procedure at all times.
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