July 13th, 2021, 11:30
J4 Service Connector Pin Assignment
------------------------------------
----+------+------+------+------+------+---PCB
|Pin 2 |Pin 4 |Pin 6 |Pin 8 |Pin 10|
|CNMI |DTR |GND |SPDL |-LED |
| | | |Pu.REF|DRV |
+------+------+------+------+------+
|Pin 1 |Pin 3 |Pin 5 |Pin 7 |Pin 9 |
|GND |DTX |GND |N/C |+ 5V |
| | | | | |
+------+------+------+------+------+
When an LED is connected to pins nine and ten, it functions in the
same manner as the LED which is mounted on the disk drive's face-
plate. This is typically used in cases when the drive is mounted in a
position where the LED is not visible or the faceplate is removed.
Pins three (transmit data, DTX) and four (receive data, DTR) are the
main communication lines. Pin two is for factory use only. Pins five
and six are signal ground lines. Pin eigth is used to synchronize the
spindles in multiple drive applications.
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