SCSI Removable Disk Subsystem Service Manual

This service manual provides comprehensive information for the installation, use, and maintenance of the SCSI Removable Disk Subsystem. The subsystem is a desktop unit comprising a high-capacity hard disk drive within a removable, shock-mounted canister and a chassis with an integrated power supply, designed for VAXstation, MicroVAX, and DECstation systems.

The document covers detailed installation procedures, including unpacking, configuring unit select switches, cabling to various host workstations (including daisy-chaining multiple units), and a specific power-up sequence for SCSI devices. It also outlines installation verification steps using console commands like SHOW DEVICE, SHOW SCSI, and test -c.

For using the disk, the manual provides guidelines on safe handling (e.g., proper storage, removing the canister before transporting the chassis, cautions against moving while spinning), mounting and dismounting procedures tailored for VMS and ULTRIX operating systems, and instructions for activating the write-protect feature.

Service and maintenance information is included for field service engineers, detailing chassis components (voltage select switch, fuses, power supply, power control board) and canister components (internal distribution board, disk drive installation). It also addresses system upgrade requirements, particularly for VS35xx models that may need internal cable replacement.

Finally, a troubleshooting guide assists in resolving common issues such as devices not appearing in system configuration and problems with the write-protect switch. An appendix explains SCSI addressing rules and conventions, recommended device IDs, and self-test status codes.