HP 9000 Series Service Manual page 461

Diagnostic LED:
The Green diagnostic LED continuously monitors the presence of all necessary cables
and supply voltage potentials. The LED will be on when the following are present
Model D3xx
+5 Volts DC
+12 Volts DC
Terminator Power form Host Adapter
Module Presence Cable
SCSI Ribbon Cable
Upper Power Cable
Lower Power Cable
SCSI Reset:
A Glitch-free reset circuit is incorporated on the backplane. It holds the bus reset during
the entire operation of removing a disk module or replacing it. The duration of the reset
will last from the time pins are detected going in or coming out of the backplane and will
end approximately 10 ms after completion of the operation.
Appendix C
Model D2xx
+5 Volts DC
+12 Volts DC
Termintor Power from Host Adapter
Module Presence Cable
SCSI Ribbon Cable
Upper Power Cable
Lower Power Cable
HotSwap Disk Bay (D Class Only)
C-7