Fujitsu MAX3147NC Maintenance Manual page 67

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
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.
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.)
C141-E229
150 Ω
CN1-A2
IMPORTANT
IMPORTANT
(HDD)
4-17