ncr/doc/Old Models/Technical Manuals/7453_... - Alsys Data

Chapter 3: Troubleshooting 3-3Diagnostic LEDsThree LEDs behind the door on the front panel can be monitored toidentify possible problems with the terminal..A BCABCMemory Dump Switch. Ethernet Link IntegrityPower Good"Heart Beat"15193Note: To access the Memory Dump Switch, you must insert a smallpointed object, such as an unfolded paper clip, through the openingto the left of the LEDs to reach the area shown above. On Series4xxx workstations, the memory functionality may not be present,even though the switch is present.The top LED verifies the integrity of the link to the Ethernet hub. Themiddle LED verifies that power is good from the power supply. Thebottom LED is the "Heart Beat" LED. It flashes red as the unit powersup through POST diagnostics. It toggles on and off while the unit isbooting up and can end up either on or off.