Specifications
Page 11Installation Instructions: SCSI Disk Drives
PIN 1 ------>
Plugging the 50-pin interface cable in backwards can damage the drive.
Plug the 4-pin power cable into the drive. This connector is keyed so you can’t go
wrong.
10.0ISOLATING SIGNAL AND CHASSIS GROUNDS
For all AMOS 680X0 applications it is important to prevent the disk drive’s DC (signal)
ground from being shorted to the computer’s AC (chassis) ground. Alpha Micro’s SCSI
drive mounting kits contain the necessary hardware used to isolate the drive from
chassis ground. However, you should not be concerned if your drive installation kit
does not contain any of the drive isolation accessories described in the next few
sections. Some disk drives, due to the nature of their design, do not require any
special isolation hardware. You can be certain your drive is properly isolated by using
an ohm meter as described in the next section.
In Series 90 installations, the isolation of signal ground and chassis ground is not
required and is not a problem.
10.1Testing for AC to DC Ground Shorts Using an Ohm Meter
Using an ohm meter is the only way to insure you have properly isolated your disk drive
from chassis ground. We highly recommend that you use an ohm meter to verify
your installation, using the following instructions:
100K
OHMS
0
MAC782
PDI-00436-20, Rev. A15