Keri Systems SB-293 - Manual (Page 97)

Keri Systems, Inc. Technical Reference Manual – PXL-250 and SB-293
Revision 5.5 P/N: 01836-004 Page 97
12.0 Periodic Maintenance
To ensure the best operating conditions for your access control system, Keri Systems
recommends performing the following checks periodically at each controller.
1. Verify the controller's earth ground is still a quality earth ground.
2. Verify all terminal block connections continue to be secure.
3. Perform the signal strength test found in the Troubleshooting and Diagnostics
Appendix to ensure that reader signal quality at the controller is maintained and
that reader read range continues to be high.
4. If the controller has a backup battery for operation during a power outage,
disconnect the power and verify the controller continues to operate under backup
battery power.
If there are any concerns regarding the operation or performance of the PXL-250
Controller or SB-293 Satellite board, please review the Troubleshooting and
Diagnostics Appendix.
A number of status LEDs have been placed on the controller PCB to help maintain the
controller and verify controller operation. Please refer to Figure 9-1 on page 39 and
Figure 12-1 for the location of these LEDs.
• Communication LEDs
• Power LEDs
• Lock and Alarm LEDs
Figure 12-1: Modem/Controller Communication LEDs