RT PC User Setup Guide SA23-2608-0, 3d Ed. 1988

6151 System Unit - Hardware Maintenance and Service Manual
  NOTE: IBM used a light cyan color for some text and highlighting. In the interest of trying to keep file sizes and image quality reasonable, I scanned in B/W and some examples may appear blank. As time allows, I will edit each file and add the missing text. 18 MAR 07

Section 1 - System Description
Section 2 - Diagnostics
Section 3 - Problem Isolation Charts
Section 4 - Remove and Replace
Section 5 - Base System Unit
Section 6 - System Memory Options
Section 7 - Diskette Drive
Section 8 - Fixed Disk Drives
Section 9 - Adapters
Section 10 - User Input Devices
Section 11 - Displays
Section 12. Tape Drive
Section 13 - Appendixes

RT PC Guide to Operations SA23-2607-0 3d Ed June 1988
Part 1
Part 2