Seagate CHEETAH ST34501FC - Manual (Page 26)

24 Cheetah 4LP FC Installation Guide, Rev. B
[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)
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]