Don-
Been there EXACTLY before! Mine ended up being a patchbay issue,
after doing pretty much everything you've talked about, I decided to
clean and exercise all the 2-mix jacks, and my right channel came
back. Don't know if this will help you or not...
Good Luck!
Adam
On Nov 6, 2011, at 12:34 AM, Donald Put 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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