Seagate 146.8GB HDD ST3146854LC Manual De Usuario

48

Cheetah 15K.4 SCSI Product Manual, Rev. B

     

[1]

Notes explaining the functions of the various jumpers on jumper header connectors J2, J5, and J6 are 
given here and in Section 8.1.2. The term “default” means as standard OEM units are configured with a 
jumper on those positions when shipped from factory. “Off” means no jumper is installed; “On” means a 
jumper is installed. OFF or ON underlined is factory default condition.

The PCBA on LC models does not have connector J5. The J5 connector signals conform to SFF-8009 
Revision 2.0, Unitized Connector for Cabled Drives, signal assignments for auxiliary connectors.

[2]

These signals are also on 80-pin J1 I/O connector. See tables 27 and 28, note 9.

[3]

Voltage supplied by the drive.

[4]

Dashed area is optional host circuitry (external to the drive) connected to host supplied optional usage 
plug. 

[5]

Do not connect anything to J5 pins 9, 11-12 or J6 pins 13-20.

[6]

Connect an external Drive Activity LED to J6 pins 11 and 12 (see Figure 18), or to J5 pin 8 (see Figure 19) 
and the drives +5V power source, through an appropriately sized current limiting resistor. The drive pro-
vides an internal 150 ohm current limiting resistor for the J6 connection.

Parity Disable

Term. Power to SCSI Bus

No connection

J2

Jumper Plug

(enlarged to
show detail)

*

Additional notes on these 

  functions in section 8.1.2.

J2

Drive
Front

J6

S
E

D
S

M

E

W

P

P
D

N
C

N
C

T
P

Jumper

Positions

Force single-ended bus mode

Pin 1

Write Protect

Enable Remote Motor Start

Delay Motor Start