Table 7-2. Power Supply LED Meanings
1 If the blue LED is lit, AC voltage is available.
2 If the amber LED is lit, there is a possible fan problem or other power supply
issue. The power supply will need replacement.
3 If the green LED is lit, DC power is OK and active.
4 Cooling Fan Grill
5 Thumb Screws
6 Power Receptacle
Note: Not all power supplies have LEDs. The original power supply for the 2U
library did not have LEDs though any power supplies replaced will likely
have LEDs. The 4U library has power supplies with LEDs.
If the Library does not power on:
1. With library power OFF and the power cord unplugged, loosen the three
thumb screws (5), grasp two of the thumb screws, pull the power supply out
half way and then reseat the power supply and tighten the three thumb screws.
2. Ensure the power cord is plugged in at the power supply (6) and at the
electrical outlet, then turn library power ON.
a. For power supplies with LED’s, the “Blue” LED will be lit if AC power is
good.
b. If your power supply does not have LED’s, feel for air flowing out of the
cooling fan grill on the rear of the library (4). AC is good if air is flowing
from the cooling fan grill.
3.
3. If AC appears to be missing
a. Plug the power cord into another electrical outlet.
b. Plug another device into the outlet to test.
c. If the outlet tests OK, try another power cord.
a77ug198
4
6
5
Figure 7-2. A 80w power supply without LEDs
Chapter 7. Troubleshooting 7-9
