Here I am a decade plus later looking for the same. It belonged to my wife's parents and has some sentimental value. Developed a power issue this fall, no display, fuse is good. No Q4. Has a LM7805 & LM7810 with no voltage on the terminals. I've spent hours looking for a matching schematic. I'm a little rusty on component level repair since my job no longer requires it.
Board 260128-0001
09/12/03 1251
1184