Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 98)

Chapter 8
Troubleshooting and Maintenance
8–3
To aid in troubleshooting, LED indicators are provided on the Power Supply
Board and Processor Board (refer to Figure 8.1). Use the diagnostics mode to
further isolate problems.
Figure 8.1
Fault Isolation LEDs
RESET
RESET
AC Power LED
DC Power LEDs
The Processor Board has two LEDs indicating that the proper DC power is
applied to the board. The Processor Board also has an LED indicating that
AC power is applied. Use these LEDs in conjunction with the diagnostic
mode to isolate faulty components.
Using LED Indicators
and Diagnostic Mode