Anytime. If I hadn't been on my iPhone at the time, I would have
mentioned that the last time this came up on the list it turned out to
be the RCA plugs from a rack of cassette decks that hadn't been used in
ages. Some assistant had borrowed one of the decks and left the cables
in a heap in the back of the rack (because no one used the machines
anymore...).
All the best, and I'm glad you can get back to work.
Ike
p.s. Remember my motto: "Beware the switch (jack, module, function
etc...) you never use!"
On 11-11-06 10:06 AM, Donald Put wrote:
Ike,
You are THE MAN! That's exactly what it was. I looked under the desk
and found one of the unused RCA connectors had somehow tried to mate
with the 1/4 plug remote plug for my HD24, which wasn't in use at the
time, and it was shorting out the RCA. Unreal. What are the odds of
that happening? I should have known this since something similar
happened many years ago. I guess I better not go out on a golf course
during a thunderstorm, eh? Chances are, I'd be hit by lightening twice.
Adam, good idea as well and I had checked that.
Thanks a million! I can't tell you how stressed out this had been
making me.
Cheers,
--
Don
On Sun, Nov 6, 2011 at 6:37 AM, Ike <[email protected]
<mailto:[email protected]>> wrote:
Don
Look for shorts in the o/p wiring. Especially if you have any
RCA or TS outs lying around, unused.
Best
Ike Zimbel
Zimbel Audio Ltd
416-720-0887 <tel:416-720-0887>
www.zimbelaudio.com <http://www.zimbelaudio.com>
Sent from my iPhone
On 2011-11-06, at 1:34 AM, Donald Put <[email protected]
<mailto:[email protected]>> wrote:
> Hello everyone,
>
> Well, I've got a problem that's causing me to pull what little
hair I have left out. The right side of the mix buss on my Series
II went out (not all the way, but severely lacking in level) and I
can't seem to figure out why. When I'm mixing through the board
and when I run the oscillator through the 2-mix, the right side is
way down. Adjusting the right level pot doesn't help at all.
When I select one of the tape inputs (CD, iPod, etc.), everything
works fine. Here's what I've done so far:
>
> The 2-mix master module checks out fine EXCEPT when I have it
feeding the control/studio room modules. Something is pulling
current on the right side because the supply voltages are about 2
volts lower on the right side vs. the left. If I lift the end of
the resistors that feed the control room module and jump the right
side from the 2-mix to feed the left channel down the circuit in
the control/studio module, it works and the meter registers the
right level. When I connect the left to the right side, I get the
same problem on the right; that is, no level on the right. This
tells me both sides are working fine up through the 2-mix module
and that the problem is definitely downstream on the right
channel. Whatever is causing the right side in the 2-mix module
to draw more current must be down circuit somewhere.
>
> OK, I figured, on to the control room monitor section. The
outputs from the 2-mix module feed an IC and the TAPE switches on
the control room monitor PCB. The output from the IC feeds goes
to the switch bank and also on to the "buffered 2-mix" that feeds
the "studio monitor module" and the switch bank for selecting
2-mix, tape 1, 2, 3, 4, and cue. It also feeds the 2-mix meters.
My best guess is that something along this signal path is where
the problem lies, but I'll be damned if I can locate it.
>
> I've replaced all the ICs in the signal path from the 2-mix
through to the meters and also found some other suspect things
that I fixed, but the problem still persists. I'm going to
disconnect the feed to the meters tomorrow to see if the problem
goes away. I'm also going to drop the bottom off to check the
solder joints on the motherboard molex connectors even though I
replaced those a few years ago. This problem definitely has the
feel of some extra resistance somewhere that's pulling the signal
down.
>
> I know I'm rambling a bit, but I've been on this all day and I
guess I'm a bit frustrated. If anyone has and ideas, fire away!
I wish I could attach the schematics. Maybe I'll scan them and
host them somewhere tomorrow if anyone wants to have a look.
>
> Of course, this happens right before my busiest week of
recording audition CDs for the music students at the school where
I work. Since many of them end up in places like Julliard,
Manhattan School of Music, Colburn, and New England Conservatory,
etc., the stakes are high and I need to get this fixed or figure
out a plan B pronto.
>
> Thanks,
> --
> Don
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