This article is from the Macintosh hardware FAQ, by Elliotte Rusty Harold firstname.lastname@example.org with numerous contributions by others.
Larry Pina has written several excellent guides to repairing Macs.
Mac Classic & SE Repair and Upgrade Secrets (Peachpit Press, $28,
ISBN #1-56609-022-9) covers the SE, SE/30, Classic, and Classic II.
This volume offers moderately detailed instructions for someone with
prior electronics experience to diagnose common problems, do
component level repairs and perform upgrades on compact Macs.
Macintosh Repair and Upgrade Secrets (Hayden Books $24.95, ISBN
#0-672-48452-8) is an earlier version of this book which covers
compact Macs from the 128K to the SE and the Lisa. Pina's sequel,
Macintosh II Repair and Upgrade secrets, $39.95, ISBN #0-13-929530-5,
offers similar coverage of the Mac II family of Machines. All these
books include valuable diagnostic software on a bundled disk. Before
delving into this volume you should be comfortable wielding a
soldering iron on expensive equipment. Finally he's also written the
somewhat less technical and more detailed Dead Mac Scrolls (PeachPit
Press, ISBN #0-940235-25-0, $32) which offers symptom-based
procedures for diagnosing and repairing many common problems. This
book includes good advice about how to find and deal with a repair
shop. All four books deserve a place in the library of anyone who
intends to wield a soldering iron on their Mac.