emulatorII-list

I sent my E2's power supply to a reputable tech to be re-capped and got it back recently.

I installed the PSU, checked and double checked the connections, shielded my eyes and 
fired her up with the lid open.  Success!  It booted right up after laying dormant for well 
over a year, used for a few months before that, and dormant for some 10 years before 
that!  Cleaning the floppy drives I'm sure helped (excellent tip, btw hexafuzz!) but that's an 
impressive feat nonetheless.

So anyway, right after booting and once the drive finished spinning down, I played a few 
glorious Arco Strings notes, then noticed a super high-pitched frequency coming from the 
unit.  I unplugged the speaker, same sound.  Alarmed, I turned it off and dropped the tech 
a line.  He seems to think that it's not a safety issue, and suggested I measure the 
voltages.

In the interim, I deduced that the sound STOPS when the drive is being accessed.  THAT's 
why I didn't hear the sound on boot.  Accessing the software, while normal to kill the 
audio output (the high tone can be faintly heard here, too), I clearly observed the sound 
ceasing from the PSU just like on boot.  Quiet as a church mouse!  ;-)

So, testing at the PSU connector, the 5v line is reading 5.08-5.10 and the 12v line is at 
13.55-13.58

Testing at the disk drive end, the 5v line reads 5.01-5.02 and the 12v line is 13.51 or 
thereabouts.

Also checked the lines where they connect on the boards, those show up in the same 
basic range that the disk drive does, i.e., a little less than the measurement at the Molex 
connector on the PSU.  I also watched from the moment it was turned on, through when 
the drive stopped spinning and beyond� I observed no change in the voltage aside from a 
slow couple hundredths up-tick for a few seconds right after powering on which I imagine 
is normal...

I only checked the RED (12v) and YELLOW (5v) and none of the others.  Not too sure about 
the +/- thing...

A no brainer, right?  A 13.55v measurement sure ain't 12v, now is it?  Well, while I can't 
read the schematic, I did notice a number written on that page somewhere that was "13.2" 
which is intriguing to say the least, and gives me great pause.

So...  Maybe I'm not that far out of spec of 13.2v?

Maybe the drive puts just enough pull on the PSU that it stops the TV tone in it's tracks 
for that time??

I can hear it in the MIX OUT, too--  a grounding problem???


Thank you in advance,
adr3laynyc