Fujitsu MBA3300NP, MBA3073NP, MBA3073NC, MBA3147NC, MBA3300NC, MBA3147NP manual Hdd

b.Fault LED: Output signal (CN1-A2 pin)

The HDD indicates that the write-protect status is in effect (CN1-A12 is connected to the GND, or the CN2-9 and CN2-10 are short-circuited.) A signal for driving the LED is output.

74LS06 or equivalent

(HDD)

150 Ω

CN1-A2

IMPORTANT

This signal is temporarily driven at the GND level when the micro program reads the SCSI ID immediately after the power supply to the HDD has been switched on (it is possible to set up the SCSI ID by short circuiting CN1-A1 and CN1-A2.)

c.CN1-A6 (reserved)

This pin is temporarily driven at the GND level when the micro program reads the SCSI ID immediately after the power supply to the HDD has been switched on (it is possible to set up the SCSI ID by short circuiting CN1-A3 and CN1-A4, and CN1-A5 and CN1-A6.)

This pin gets high impedance status except above.

d.–LED and LED (+5V): Output signals (CN1-A8 pin and CN2-21, 22 pin)

These signals drive the external LED as same as LED on the front of the disk drive. The electrical requirements are given in Figure 4.21.

IMPORTANT

1.The external LED is identical in indication to the LED on the front of the HDD. The LED blinks during command execution.

2.Any load other than the external LED (see Subsection 4.3.5) should not be connected to the CN2-21, 22 pin (LED [V] and –LED terminals).

3.This signal is temporarily driven at the GND level when the micro program reads the SCSI ID immediately after the power supply to the HDD has been switched on (it is possible to set up the SCSI ID by short circuiting CN1-A7 and CN1-A8.)

64 C141-E270