Application Fault Led/Logic Fault Led (Amber); Fault Led-Rear Panel (Amber); Fault Led-Top Lid Left (Top Lid B) (Amber); Overview Of Rear Panel Leds - Seagate Exos AP 4U100 Installation And Maintenance Manual

Pull the chassis forward from its installed position within the rack. Remove the top lid and look for an amber LED on any
of the drive modules or HS expander modules on the sideplane. Replace the faulty module per the applicable CRU
replacement procedure.

Application Fault LED/Logic Fault LED (amber)

The LED is set using SES page. It illuminates amber when request fail bit from "enclosure control element" in SES page 2
is set.
Fault LED–Rear panel (amber)
The LED illuminates amber when experiencing a system hardware fault in a component accessible via the enclosure rear
panel. This LED is normally OFF, and illuminates only when a fault occurs with a component installed in the enclosure rear
panel.
Observe the enclosure rear panel, and look for a fault indicator on any of the following components:
• Controller modules
• System fan modules
• PSUs
Fault LED–Top lid left (top lid B) (amber)
This LED illuminates amber when experiencing a system hardware fault with a component accessible via the enclosure
top. Amber display indicates that the top lid on the left should be removed to locate the faulty component within the
controller channel. This LED is normally OFF, and illuminates only when a fault occurs with a component beneath the top
lid on the left.
Pull the chassis forward from its installed position within the rack. Remove the top left lid and look for an amber LED on
any of the following components.
• SFF drive modules
• Controller channel fans
• Storage personality modules
Replace the faulty module per the applicable CRU replacement procedure.

Overview of rear panel LEDs

This topic gives you a walk-through of the LEDs present on the rear panel components. Power supply units provide
optimal power to the enclosure. Cooling is provided by four separate cooling fans and two controller channel fans. The
Controller modules along with Storage personality modules provides the ability to manage the enclosure. Also see
"System airflow" (page 35)

Power supply unit

AC-DC power is provided by up to two auto-ranging power supply units (PSUs).
3,200W PSU
Exos AP 4U100 uses two 3,200W PSUs and their operating voltage range is nominally 200 V–240 V AC, with 50 Hz-60
Hz as input frequency. The dimetric rear orientation in
located on the enclosure rear panel.
for optimal cooling within the enclosure (s).
Figure 16 shows the PSU aligned for insertion into either PSU slot
Overview of rear panel LEDs 33