Seagate BARRACUDA ST39173FC - Manual (Page 26)

24 Barracuda 9LP FC Installation Guide, Rev. A
Figure 4: LED indicator connector (J6)
J6
Drive
Front
Pin 1
Port A Bypass LED [1]
Reserved
Port B Bypass LED [1]
Fault LED [1]
Reserved
Active LED [2]
+5V
Active LED [1]
Ground [3]
[1] The drive has a 2.2K ohm resistor in series with this
LED driver. Tie the minus side of an external high-
efficiency LED (i.e., 2ma) to this pin. Connect the
plus side of the LED to +5V.
[2] An external current-limiting resistor is required when
connecting an LED to this pin. Connect the minus
side of the resistor/LED combination to this pin. Con-
nect the plus side to +5V. This pin is connected in
parallel with the signal of the same name in the inter-
face connector (J1).
[3] Jumper storage location (across pins 2 and 4).