Comtech EF Data SMS-301 - Manual (Page 82)

Maintenance SMS-301 Redundancy Switch
Rev. 3 5-4
5.3 Fault Isolation
System faults are reported in the Fault menu. Refer to Table 5-2 for guidelines to isolate
problems, and the appropriate action(s) to be taken.
Table 5-2. Fault Isolation, 1:1 Switch
Fault Description Action
Battery/Clock Corrupted non-volatile memory
detected after hard reset or
power-up. 1. Replace lithium backup battery.
2. Replace M&C board if fault still occurs
after battery replacement.
+12 Volt Supply Fault
+5 Volt Supply Fault Set when power supply
voltage(s) are out-of-tolerance. 1. Check AC power cord.
2. Check for blown fuse(s) in AC entry
module.
3. Replace faulted power supply.
Power Supply #1 Fault
Power Supply #2 Fault Set when power supply
voltage(s) are out-of-tolerance. 1. Check AC power cord.
2. Check for blown fuse(s) in AC entry
module.
3. Replace faulted power supply.
Controller Fault M&C controller error detected
on power-up. Replace M&C board.
Modem COM Link Modem fails to respond to 1:1
switch commands on the
modem remote bus, J13. 1. Verify modem communications
parameters (including address
assignments) agree with 1:1 switch
configuration.
2. If single modem failure, check modem
connector and modem.
3. If complete modem failure, check 1:1
switch connector and remote cable.
Mod/Demod Verify Error Results from inconsistencies
between configuration stored in
1:1 switch and configuration
reported by modem. Reload modem configuration from
Modem Control, Utility menu.
Module Fault Internal I 2 C bus failure. 1. Replace M&C board.
2. If problems persists, replace connector
1:1 switch board.