16 Jun
2007
16 Jun
'07
7:39 a.m.
I think I'd first check I was getting a master
clock on pin 24 (I think
this should be 1MHz), and then look at pin 26 (read clock) when the unit
was trying to read a floppy.
On pin 26 there is absolutely nothing: it's always low.
I traced it back, and found that there is nothing because pin 11 of LM361
(output 1) is always low.
I didn't go back it yet.
Also, I replaced all transistors and nothing changed.
Roberto