Here is why this manual is the Holy Grail of analog repair, and how to (legally) get your hands on it. The Canon F-1 is not an AE-1. The AE-1 is electronic and modular; you swap a board. The F-1 is a mechanical watch with a mirror box. The original service manual (Pub. No. CE1-100E-000) is over 100 pages of exploded diagrams, gear train clearances, and shutter timing adjustments.
Go to LearnCameraRepair (learncamerarepair.com) or the Analog Camera Repair Group on groups.io. Users have uploaded scanned copies of the original Canon F-1 manual. It is usually a 40-50MB scan. The resolution isn't great, but it works.
If you own a Canon F-1—especially the original 1971 "Old F-1"—you don’t need me to tell you that you’re holding a tank. This is the camera that went to Vietnam, covered the Olympics, and survived dusty safaris. It is mechanical perfection.