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Page 13Installation Instructions: SCSI Disk Drives

10.2Drive Isolation (AM-1400/1600 Computers)

In AM-1400 and AM-1600 computers, 3-1/2" SCSI disk drives are installed as described

in Section 6. Unlike most of the other applications, no 5-1/4" mounting bracket is

required for AM-1400/1600 computers.

The disk drive mounting brackets in AM-1400/1600 computer’s have adhesive insulating

strips (DWF-20526-00), that when used in conjunction with nylon screws, prevent the

drive’s signal ground from being shorted to chassis ground. The nylon screws have a

metal insert which greatly increases their strength. See Figure 6.

Some early model AM-1400/1600 3-1/2" drive mounting brackets do not have the

adhesive insulating strips. Therefore, two of the insulating strips are included in drive

installations kits designed for AM-1400/1600 use.

NYLON SCREW

METAL WASHER

METAL INSERT

HDS-11806-04

MAC783

Figure 6. Drive Installation Screw

If you are installing a 3-1/2" drive that is 1-3/4" thick, it is possible for the drive to come

in contact with the chassis bottom. In some cases, by lifting the drive up before you

tighten the mounting screws, you can prevent the drive from making contact with the

chassis bottom. Your success at doing this can be verified with an ohm meter.

Alpha Micro supplies a special isolator (DWF-20525-01) for installing 3-1/2" SCSI drives

thicker than 1". It is a piece of clear mylar designed to completely wrap around the drive.

The isolator has a self-adhesive strip that comes together around the drive as shown in

Figure 7.

PDI-00436-20, Rev. A15

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Alpha Microsystems SCSI Spezifikationen Seite 17