19 Feb
2012
19 Feb
'12
3:53 p.m.
On Feb 19, 2012, at 5:21 AM, Kris Kirby <kris at catonic.us> wrote:
On Sun, 19 Feb 2012, Dave McGuire wrote:
I should probably find a service manual for my Sony VPC-1272 projector;
it's power supply intermittently sings in the most annoying way. Like,
louder than the projector's fans.
Eeeeewww. That's probably a consumer-grade switcher, too. Sucky.
Much of
the time a controlelr that buzzes/chatters has a dried-up
smoothing capacitr for the supply to the control electronics. I'd
check any sizeable electrolytics first.
That makes sense; they're pretty simple. I'll yank it and check
those capacitors, that's what I was figuring it was anyway, but I
generally like to have schematics (if possible) before tearing into
something. Dave, I see you have your license again; interesting
choice of a vanity
call.
Oddly enough, that's my FCC-assigned call. I had a few possible vanity calls in
mind, but when this one came in, I thought it was pretty neat so I decided to keep it.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA