IBM 5160 - Some Documentation Pointers
"An Introduction to the XT"
Pages 1115-1124 (PDF pages 1147-1156) of Upgrading and Repairing PCs - Tenth Anniversary Edition
IBM manual - 'Guide to Operations'
Click on this link to get to the IBM area of the 'Manuals' web page.
IBM manual - 'Technical Reference'
Click on this link to get to the IBM area of the 'Manuals' web page.
Circuit diagrams
Click on this link
Part numbers
Included in a 'parts catalog' at here.