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
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