The Clymer Chain Saw Service Manual (10th edition is current I believe) is about the most comprehensive manual out that I've came across. Its actually about the only one I've came across except for dealer specific literature. It has a general section for carbs, ignition, chains, etc. and then specific sections for different saws. There's not tremendous detail for each saw model, usually 4-5 pages for a given model or series. There are illustrations for primary assemblies on most saws with general steps for disassembly and reassembly, but its not down to the level of
1. remove screw (item 32 in illustration 12B) from handle assembly using 8mm wrench.
2. remove throttle latch by rotating counterclockwise at a 135 degree angle.
3. .......
well, hopefully you get the idea. It all depends upon your experience level for mechanical workmanship whether you'll find the information provided adequete to do a specific job. Again, the latest is the 10th edition I think so depending upon the year of the saw you want to work on, you can find earlier editions at various used bookstores.
Dan