Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 99)

Chapter 8
Troubleshooting and Maintenance
8–4
The general guidelines for using the LEDs to isolate faults are:
1. If the DL50 appears to have a fault or if the STATUS LED on the front
panel is flashing, the DL50 should be opened for diagnostics.
Disconnect power before servicing. Failure to follow this
warning could result in electrical shock.
ATTENTION:
!
Loosen the screws securing the front cover latches of the DL50. There are
6 door latches on the small display (Catalog No. 2706-F11J, -F11JC) and
10 latches on the large display (Catalog No. 2706-F21J, -F21JC).
Note: Loosen, do not remove, screws to turn latches.
The next step allows the front cover to open downward. Make
sure there is adequate clearance. Failure to provide proper
clearance may cause damage to the display.
ATTENTION:
!
Carefully turn the latches away from the door. After all of the latches
have been turned, the front cover can be lowered.
2. Set the Mode Select DIP switches to select Diagnostics (refer to
Figure 3.2, DIP switch S2-7 ON). Press the RESET button or cycle the
power. Observe the front panel display.
In the diagnostics mode, the DL50 will run the following tests:
m P Confidence Test
RAM Test
ROM Test
Processor Board Power
Serial Test
Display Test
The DL50 will continuously repeat the diagnostic tests until a different
operating mode is selected (DIP switches) and the RESET button is pressed
or power is cycled.