I just picked up a Hill Audio Remix 24x8x16x2 console "as is" (i.e.
broken) for next to nothing. The internal fuses were blown in the
power supply, so I replaced them and the board seems to power up fine.
22 of the 24 channels work and the main buss outputs work. The tape
out and monitor out are dead in the left side. I didn't want to
connect anything I cared about, monitor wise, until had a better
picture of over all health, so I plugged a cheapie set of headphones
in to the headphone jack and left them laying on the console so I
could hear the a test tone while I checked the busses. When I picked
them up a minute or so later, the left earpiece was hot as hell. Not
enough to fry an egg, but about right to heat a dinner roll. I'd like
to covert back to stock headphone use. Any obvious suspects for the
cause/fix?

I just picked up a Hill Audio Remix 24x8x16x2 console "as is" (i.e.
broken) for next to nothing. The internal fuses were blown in the
power supply, so I replaced them and the board seems to power up fine.
22 of the 24 channels work and the main buss outputs work. The tape
out and monitor out are dead in the left side. I didn't want to
connect anything I cared about, monitor wise, until had a better
picture of over all health, so I plugged a cheapie set of headphones
in to the headphone jack and left them laying on the console so I
could hear the a test tone while I checked the busses. When I picked
them up a minute or so later, the left earpiece was hot as hell. Not
enough to fry an egg, but about right to heat a dinner roll. I'd like
to covert back to stock headphone use. Any obvious suspects for the
cause/fix?


I've got a Hill Series Three, and there's no such problem.

Maybe there's some kind of electrical short, or you were driving the
headphones to the max?
(that's the only time I heard of headphones overheating)

I suspect that seeing as you were using them as open monitors, maybe you had
the volume turned
up all the way and it was driving the headphones too much?

Try it again with lower volume...

Good luck!

Mario

Maybe there's some kind of electrical short, or you were driving the
headphones to the max?
(that's the only time I heard of headphones overheating)


Could also go to the orginal reason the fuses blew. Perhaps driver circuit for
the headphones? Sounds like some AC in there somewhere (bad rectifier).

Don't hurt yourself

Wayne

The headphone volume wasn't very high, about a third of the way. I
assume there is as short in the monitor section somewhere (the left
channel monitor outs don't work either). I was hoping someone might
have a guess as to where to look first for failed components.

Following your bad rectifier lead, I went in and looked at the power
supply board. It's pretty brown underneath the rectifier diodes. I
didn't have a meter with me, but I suspect that they're at least the
first part of the problem. Thanks.


"Vortex" wrote in message . ..
Maybe there's some kind of electrical short, or you were driving the
headphones to the max?
(that's the only time I heard of headphones overheating)


Could also go to the orginal reason the fuses blew. Perhaps driver
circuit for
the headphones? Sounds like some AC in there somewhere (bad rectifier).

Very true!!!


Don't hurt yourself


Good advice!!

I'm still laughing about Mixerman's "Bitch Slap" diary when the session
drummer insisted on
using earplugs and duct taped (I kid you not) the headphones around his head
(shaved head),
and then had his headphones driven by an power amp to get it load
enough....after 15 minutes the
drummer ripped off the duted taped headphones screaming in pain because they
just burned his ears!!!

Hence my reasoning for thinking the volume was turned up too much

Mario

apa wrote:
The headphone volume wasn't very high, about a third of the way. I
assume there is as short in the monitor section somewhere (the left
channel monitor outs don't work either). I was hoping someone might
have a guess as to where to look first for failed components.

No, it is oscillating. Get out the scope and you'll see a lot of ultrasonic
trash.

Following your bad rectifier lead, I went in and looked at the power
supply board. It's pretty brown underneath the rectifier diodes. I
didn't have a meter with me, but I suspect that they're at least the
first part of the problem. Thanks.

No, they are brown because they have been overheating because the console
has been drawing so much current for so long. This is a symptom and not the
problem.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

In article writes:

The headphone volume wasn't very high, about a third of the way. I
assume there is as short in the monitor section somewhere (the left
channel monitor outs don't work either). I was hoping someone might
have a guess as to where to look first for failed components.

Got a voltmeter? (you shouldn't be doing any troubleshooting without
one) See if there's DC on the headphone output for the can that gets
hot. If it gets hot without a lot of volume, it's probably because
it's putting the power supply into the headphone. As far as failed
components, it's probably the chip that's the headphone amplifier,
unless there's a capacitor in series with its output on the way to the
phone jack.



--
I'm really Mike Rivers - )