Comtech EF Data RCS11 - Manual (Page 86)

RCS11 1:1 Redundancy Switch Maintenance and Troubleshooting
MN-RCS11 – Revision 9 6–2
CAUTION
The appropriate AC power cord must be disconnected before the fuse
may be removed. To keep the RCS11 operational, be sure to disconnect
only one power cord at a time. Also be sure to replace the fuse and the
power cord before checking the other fuse.
The AC fuses are located at the front of the RCS11 on the Power Supply Boards inside the unit.
Test the fuse with an Ohmmeter or similar device. If necessary, replace the fuse with a new one
of the same size and rating. Failure to do so may result in damage to the equipment, void the
warranty, and may result in a fire hazard.
6.2.2 Checking the Cabling and Connectors
Problems that appear difficult to solve can often be traced to a loose or defective cable or
connector. The user should first verify the following:
•
All cables within the system have no broken or loose connections. Cables that are suspect
should be replaced.
• All jacks on the units have no bent or broken pins.
• Both AC Power Cords are properly plugged into the rear of the RCS11.
6.3 Major and Minor Faults
Major faults are failure conditions or combinations of conditions that result in loss of service on
one or more channels. Minor faults are failure conditions that do not result in loss of service.
Possible Major Fault conditions are:
A Read-Only Memory (ROM) failure in the Switch;
A Random Access Memory (RAM) failure in the Switch;
A loss of Carrier Detect on a Demodulator Channel where this attribute is monitored;
A loss of Terrestrial Input Clock on a Channel where this attribute is monitored;
A failure of two monitored Modulators;
A failure of two monitored DeModulators;
A failure of both RCS11 power supplies.
Possible Minor Fault conditions are as follows:
A failure of one of the Switch’s two redundant power supplies;
A failure of one Demodulator that is being monitored (i.e., a Demodulator that has not been
locked out);
A failure of one Modulator that is being monitored;
A reference clock slip.