Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 100)

Chapter 8
Troubleshooting and Maintenance
8–5
As each test is being made, the DL50 displays the name of the test. After
each test the DL50 displays the results. The results are also sent out to the
RS-232 port.
mP Confidence Test
This test checks the ability to read/write to the processor’s internal registers.
If this test fails, the processor board needs replacement. Refer to
Replacement Parts List, Table 8.B.
RAM Test
This test writes to RAM and verifies the write. If this test fails, the processor
board needs replacement. Refer to Replacement Parts List, Table 8.B.
ROM Test
Performs a checksum and compares the checksum against the stored
checksum. If this test fails, use the bootstrap mode to reload firmware.
Processor Board Power Test
Verifies that the proper voltages are present at the processor board. Refer to
next section for instructions on how to use the diagnostic LEDs to verify
correct voltages at the processor board.
Serial Test
In this test the DL50 prompts the user to enter text from a terminal. Any text
received within 10 seconds is displayed on the DL50. After 10 seconds, the
test is terminated. If this test fails, check communications connections.
Display Test
This test displays test patterns. Use this test to isolate faulty display boards.
Faulty red display boards can be replaced, refer to Replacement Parts List,
see Table 8.B. Faulty tricolor displays must be returned to the factory for
repair.