When, like me, you don't know a lot about electronics beyond some
theoretical study as a student many years ago, it is especially satisfying
to make a repair like this.
I have a degree in electronic engineering. However it didn't help very much
repairing old computer equipment. I had to figure out how to do that for
myself from resources such as this list.
This makes me wonder just what was taught in that degree course...
I've come across just about every major type of electronic system in a
classic computer somewhre.
The digital things -- all the basic circuits, state machines, microcoded
systems, etc are obviously all to be found. So are most analogue system,
including :
Power audio-band amplifiers (deflection drivers for vector displays,
raster dispaly vertical drivers)
Video amplifiers (obvious, but also the read ampliifers of disk systems
are that sort of bandwidth)
Filters, active and LC (older modems, disk read amplifiers)
Servo systems (hard disk head positioning)
DC and AC motor drivers (obvious)
Linear and switching PSU regulaotrs (obvious again. Most CRT monitor
horizontal output stagesa are swithcing supplies too)
Phase locked loops (modems, disk data separators), these include VCOs, of
course
Crystal and LC oscillators
In fact I can't think of a circuit or system that doesn't appear
somewhere in a classic computer.
-tony
