Having spent some time searching for an Apple ][ related forum I finally found this site, which I'm glad I did!
I'm trying to revive an old Apple ][+ (actually an Asian clone) and after cleaning it up (removing corrosion), re-soldering some cold joints and changing a 74LS74 I now have the familiar "Apple ][", the cursor and beep. However, the keyboard doesn't work -or rather: CTRL-RESET is the only thing that works! There's no reaction from the other keys.
So the big question is (before I spend a great deal of time troubleshooting in the wrong area): since CTRL-RESET works (or just RESET -there's a switch on its circuit board which allows you to choose one or the other way of doing a reset), would this indicate that the keyboard is malfunctioning, or something inside the computer? I don't know how the keyboard works, but could it be that CTRL-RESET are hardwired directly to the computer (i.e. the 14 pin keyboard connector that goes into the II+ motherboard) while rest of the keys have to go through the keyboard controller circuitry (on the keyboard PCB)?
The rest of the computer appears to be working as it should, but I really can't say for sure since I don't have a second system to compare with, and the floppy disks are all 25-30 years or more old. Just about none of them booted excpt for "Apple Cillin" which presented on the screen a number of hardware tests. So at least that should verify the disk controller (slot #6) and 5.25" floppy drive works. For all I know the issue with the other floppies could be a disk alignment issue, but I don't want to look into that before I get to fix the keyboard.
So where to start troubleshooting and how?