[Avid-L2] Re: OT: Grass Valley 110 switcher tally lights

That would make sense that they would use an isolated ground for the tally circuit and not chassis ground. I don't remember what kind of tally voltage is involved, probably 5 or 12 volts?. I wouldn't think you'd want to open the door for the tally power supply to somehow create any ground loop or biasing issues. I'm just speculating here. I found the various tally interfaces for big production studios and truck fascinating at NAB. With the myriad of split feed remotes with two different control rooms sharing cameras they have dual tallies so you don't screw the other guy. Really neat in concept but I bet it's still the combined talents and experience of the camera crew etc.... that make things smooth. The tally info is there for confidence. You could major in all the setup combos possible with these tally interfaces. Some day I'll figure out why I find this stuff so interesting sense I haven't worked in a studio or remote production environment since 96.

--- In Avid-L2@yahoogroups.com, bcarroll@... wrote:
>
>
>
> Good grief, Charlie Brown! GVG 110 switcher for $200??? That's just wrong on so many levels! LOL Time marches on and you either keep up or get run over like Grandma by the reindeer.
>
> Thanks to Pete for the ebay link. Unfortunately that's the Operator's Manual which we already have. It teaches you how to do a dissolve or wipe from camera 1 to camera 2, etc. Not quite what I'm looking for. We need the Maintenance Manual which I haven't been able to locate. I did just now take another look at the grassvalley.com web site and decided to take a gander at the .pdf for the Model 110-HD switcher. They have a nice section on hooking up the tally lights and I think I may have discovered my error. On the HD switcher the Chassis Ground is connected to the shield of your tally cable while you use pin 1 for input 1 and then Tally Common for the other lead. I don't remember seeing a pin labeled Tally Common, but the unit is already in the rack and it IS dark back there with a lot of cables in the way. I saw the Chassis Ground and pins 1-8 and jumped to a conclusion that's apparently wrong. I will check it out when I'm there next and see if this new information is enough to get me on the right track.
>
> Thanks for the input. Just talking these things out with someone is often all it takes to get things sorted out.
>
> Regards,
> Bob Carroll
>
> Producer/Director
> KVCR-DT (PBS)
> 701 S. Mt. Vernon Ave.
> San Bernardino, CA 92410
> 909-384-4334
>
>
> --- In Avid-L2@yahoogroups.com, "johnrobmoore" <bigfish@> wrote:
> >
> > Can you believe that you have to find the manual on Ebay? I was surprised perusing the GVG sight how little effort is being put into info on old equipment. I know their product line has moved on but these are the guys I use to call at 7:00 pm Sunday night when I'd perhaps overstepped my technical limits and buggered up something and I'd get a call back from some tech who was on call. Has Thompson's reign really F'd up support for legacy equipment. I recall sending in a Thompson Digibeta for warranty service and it took them 6 weeks to get the machine back. It was a Sony with the Thompson moniker. They even wanted us to ship it to Neveda so they would then ship it back to Burbank for repair and back to Neveda and then back to us and we were in Burbank. I think we were able to avoid the shipping nonsence but 6 weeks was really long. Oh well time marches on with the race to the bottom.
> >
> > --- In Avid-L2@yahoogroups.com, Pete Opotowsky <popix@> wrote:
> > >
> > > *
> > > *
> > > *Bob-*
> > > *http://tinyurl.com/y878xvr*
> > > *$20 on ebay*
> > > *HTH*
> > > *Pete Opotowsky*
> > > *POP Pictures*
> > > *Orlando*
> > >
> > >
> > >
> > > On 12/18/2009 9:18 PM, bcarroll@ wrote:
> > > > Of all the message boards that I frequent, THIS ONE is the most likely to have an answer to this question. I help out a local non-profit with their studio shoots and recently their old Echolab switcher gave up the ghost. Fortunately they received a donation of an old Grass Valley 110 switcher just in time. Unfortunately it came without a manual and I'm having no luck in sorting out how to hook up the tally lights to the Sony camera control units. The Sony's want a contact closure to light up and while I see a group of pins on the back of the Grass Valley labeled Tally I'm not measuring a voltage or a contact closure from any of the pins labeled 1-8 and the pin labeled ground.
> > > >
> > > > Anyone here have experience with the Grass Valley 110 switcher and can you shed any light on what I should do to make this work? Thanks in advance for any info you can provide.
> > > >
> > > > Regards,
> > > > Bob Carroll
> > > >
> > > > Producer/Director
> > > > KVCR-DT (PBS)
> > > > 701 S. Mt. Vernon Ave.
> > > > San Bernardino, CA 92410
> > > > 909-384-4334
> > > >
> > > >
> > > >
> > > > ------------------------------------
> > > >
> > > > Search the offical complete Avid-L archives at: http://archives.bengrosser.com/avid/
> > > >
> > > > Everything you MUST know about Color Correction in one book: http://tinyurl.com/ColorCorectionforvideo Get your copy todayYahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
>

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