BA42 Storage Expansion Box Maintenance Guide

This document is the BA42 Storage Expansion Box Maintenance Guide (EK-BA42A-MG-003), published by Digital Equipment Corporation, with revisions from December 1990 to April 1991.

The guide provides comprehensive instructions and specifications for the BA42 storage expansion box, also referred to as the SZ12 storage expansion box, which is designed to house one or two SCSI drives.

Key contents include:

• Overview: Descriptions of the BA42 storage expansion box hardware, external connectors, and switches.
• Installation and Removal Procedures: Detailed steps for removing and installing drives, the expansion box cover, bezels, drive mounting brackets (RZ and half-height), internal/external SCSI cables, and the power supply.
• Drive Configuration: Instructions on setting the SCSI ID for various drive types.
• Troubleshooting: Guidance for common issues like drives having no power or not appearing in the system configuration display.

• Specific Drive Information: Hardware details, installation requirements, and SCSI ID settings for supported drives, including:

  • RZ55, RZ56, and RZ57 Hard Disk Drives
  • TZK10 1/4 inch Cartridge (QIC) Tape Drive
  • TZ30 1/2 inch Cartridge Tape Drive
  • RX23 3-1/2 inch Floppy Disk Drive
  • RX33 5-1/4 inch Floppy Disk Drive
  • RRD42 5-1/4 inch Compact Disc Drive

• Appendices: Extensive equipment specifications (physical dimensions, weight, capacity, data transfer rates, operating and non-operating environmental conditions) for the BA42 box and all supported drives, as well as a list of Field Replaceable Units (FRUs) with their part numbers.