Seagate ST19171FC - Manual (Page 22)

20 Barracuda 9FC Installation Guide, Rev. A
[1] The drive has a 2.2K ohm resistor in series with this LED driver.
Connect 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. The minus side of the resistor/LED combination is
connected to this pin. Connect the plus side to +5V. This pin con-
nects in parallel with the signal of the same name in the J1 interface
connector.
[3] Jumper storage location is across pins 2 and 4 (horizontally).
Figure 4. LED indicator connector (J6)
Pin 1
Port A Bypass LED [1]
Pin 1
Pin 2 J6
Port B Bypass LED [1]
Fault LED [2]
Reserved
Active LED [2]
+5V
Ground [3]
Active LED [1]
Pin 2
J6