My Apple /// isn't working properly as of today :-( It has been sitting idle for a couple of months now (since I last used it).
I've tried booting a couple of diskettes but the only one that worked (so far) was the Confidence Program (other diskettes loads some tracks and the freeze/hangs).
If I select/execute Machine Status test (1st option on the menu) it cycles through the disk drives and then loads what I assume is the sound sample ("I'm OK - Machine status normal" or whatever it says) from the diskette and after that I only hear a tiny click from the speaker (hardly noticable) instead of the sound sample and the program/computer freezes/hangs before the interrupt system test (no further tests is checked/done). If I reboot and select the Memory Test instead it immediately freeze/hangs when the RAM configuration map is displayed (no "animated" or moving Apple cursor). The Video Tests starts and displays the 1st image of the Apple /// bitmap but when pressing RETURN it doesn't advance further with the next test.
So far I've done the "easy" part and reseated the socketed chips both on the mainboard and the 5V memory board.
It's a 256K version of the Apple ///.
I haven't measured any voltages but I assume that if I come this far the voltages are there?
BTW, when I looked at the mainboard I noticed a resistor that seem a little burnt on the right side of the rightmost cardslot (the rightmost of the 2 big green resistors next to the 2 transistors).
Any suggestions on how diagnose/troubleshoot this further is very much appreciated - thanks!