Comtech EF Data SMS-458B - Manual (Page 93)

SMS-458B Modem Protection Switch Revision2
Maintenance MN/SMS458B.IOM
5–7
5.3 Module Replacement
CAUTION
Turn off both power supplies before removing or inserting any module.
5.3.1 General
The modules in the switch are designed for easy replacement.
Note: All digital and IF signals will be routed to the prime modems when the switch
power is off. If any prime modem(s) is faulted and backed up, the backup modulator
and/or demodulator will go offline, interrupting service when power is lost.
The following modules can be removed and replaced in the field.
Power Supply Monitor and Control
IF Switch Online Telemetry
Switch Driver Interface Switches
Address Decoder/Driver Data Switch Controller
5.3.2 Power Supply
The power supply modules are located in the upper-front section of the switch, slots 1
and 7. (The second power supply can remain on.)
1. Each power supply module is secured in the chassis with a No. 6 screw. Remove
the screw and pull the handle on the front of the module to remove the power
supply.
2. Insert the new power supply in the slot (invert the power supply for slot 7) and
press it in until fully seated. Install the No. 6 screw to secure the power supply in
place. Turn on power switch.