Comtech EF Data SDM-300A - Manual (Page 356)

SDM-300A Satellite Modem Revision 6
Troubleshooting MN/SDM300A.IOM
18–20
18.3.5 Remove and Replace the Fan Assembly
WARNING
Ensure that all power to the modem is disconnected. Make certain technicians
performing the task are in compliance with all industry safety regulations. DC
modems may contain power within the modem; observe safety regulations
prior to performing the task.
Remove the Fan Assembly, as follows:
1. Disconnect all power to the modem.
2. Remove the modem from the rack and place modem on a workbench or equivalent area
to perform the task.
3. Remove the hardware securing the cover to the chassis.
4. Remove the cover.
5. Remove the cover from the power supply.
6. Remove the Data I/O Interface connector, as follows:
a. Disconnect the Data I/O interface connector from the Main PCB.
b. Disconnect the hardware securing the Data I/O interface connector
c. Remove the Data I/O Interface connector.
7. Disconnect fan cable to the Main PCB.
8. Remove the four screws securing the fan assembly.
9. Remove the fan assembly.
Install the Fan Assembly, as follows:
1. Place fan assembly in the chassis and secure with the four screws.
2. Connect the fan assembly cable to the Main PCB.
3. Install the Data I/O Interface Connector as follows:
a. Insert the Data I/O Interface Connector into the chassis.
b. Connect the cable(s) and Data I/O to the Main PCB
c. Secure the Data I/O Interface Connector.
4. Install the Power Supply cover.
5. Install the chassis cover and secure with the hardware.