Rz23 Disk Drive Removal - Digital Equipment VAXstation 3100 Maintenance Manual

120 VS 3100 (Model 40) System
5.2.4 RZ23 Disk Drive Removal
The RZ23 drives are installed on the top drive mounting panel. One of the
drives is the system disk and connects to the SCSI-A bus while the other two
are user disks and connect to the SCSI-B bus. Tney contain an internal FRU
called the drive module/frame. Once you remove the drive from the system,
you must always replace the drive module/frame first before replacing the
whole drive. If replacing the drive module/frame did not fix the fault in the
drive, you must replace the drive as one PRU since the head/disk assembly
(IIDA) is not a separate PRU. The following procedure describes how to
remove the drive from the system and how to remove and replace the drive
module/frame.
1. Remove the system box cover (Section 5.2.1).
2. Remove the top drive mounting panel (Section 5.2.2).
3. Tum the drive mounting panel over and remove the four screws from the
drive. Support the drive
with
one hand when removing the last screw.
4. Disconnect the drive interconnect cable and remove the two screws with
an 1/8 inch Allen wrench (Figure 5-10).
Figure 5-10 Removing the HOA
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