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]> 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 > www.zimbelaudio.com > Sent from my iPhone > > On 2011-11-06, at 1:34 AM, Donald Put <[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 > ------ > > View the list online at: http://www.mail-archive.com/[email protected] > > You can unsubscribe at anytime by sending an email to mailto: > [email protected] with "unsubscribe neotek" in the message body. If > you have any difficulties, or questions --please send an email to mailto: > [email protected]. > > The Neotek list is lovingly hosted by Catapult Web. Remember that any > message or reply sent to the list will be automatically forwarded to all > subscribers. > > Vive Le Neotek! > > Thanks. >
