6 Apr
2010
6 Apr
'10
12:48 p.m.
Hello,
I'm repairing my A1010 Amiga external floppy drive - the actual drive
works (tested by plugging it into the internal A500 floppy connector),
so the fault should be on the latch board inside; there are two chips,
a 74LS74 D Flip-Flop and one chip (also 14 pin) with number M53238P
preceded by the Mitsubishi logo. Given the required function, and
connections on the adapter board, I am 99% sure that it's a 74LS38
Quad NAND open-collector equivalent - but googling doesn't turn up a
I am pretty ssre it's the same pinout and function. I t may well haev
differente drive caracteristics, but thit probably deosn't matter. A '38
whould work fine.
PS. Symptom is that the drive clicks but never spins.
I've already
taken out the chips and replaced them - this time in sockets. So if
I'm wrong it's a simple matter of undoing the 20-odd screws yet again
(Verdammte Post mit deren entstoerregelungen von damals...) and
Does that have an English translation that can bve used in polite
compnay :-)
replacing the chip. I just want to double-check
before plugging it
into the A500 again tonight.
-tony