SSlmixed.com Forum
Tech discussion => 4K,6K,8K Series => Topic started by: perfectsnd on November 20, 2013, 05:16:59 AM
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My VCA to Monitors is not working. I'm not sure it every did, but this is big button for me as I like to have my tracks on the faders coming back from the multitrack and the small fader to send to the busses. When I press in the VCA to Monitors switch the light engages, but the status of the console doesn't change. I am assuming that the small faders would have the green led button lit to show they were routing to the matrix. What should I be looking for?
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VCA to Mon control voltage is via Pin 21 on the 82E21 card
My first change would be T4 on the 021 card (4011 Logic IC)
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What should pin 21 when checked with a meter?
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What should pin 21 when checked with a meter?
+17V for VCA to Mon active
+11v for not active
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I have +11.8V for not active and + 18.26V when active on Pin 21. Where is the next place to check?
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That looks good.. you sure VCA to Mon is not working?
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Yes. When in Record Mode and I hit VCA to monitor the Large Fader is still sending to the routing matrix and the small fader is still going to the the L/R buss.
I would assume also the green lights that show To Routing should turn green showing that the small fader is sending to the routing matrix.
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Surfing an Extender: Upper Bus card Pin 57, getting these voltages for VCA to Mon on and off.
Based on the console voltages +/- 17.91 and Logic +11.56v
(http://i44.photobucket.com/albums/f23/sin-tech/RecordVCAtoMon_zpsabd07175.jpg) (http://s44.photobucket.com/user/sin-tech/media/RecordVCAtoMon_zpsabd07175.jpg.html)
(http://i44.photobucket.com/albums/f23/sin-tech/Record_zpsbfe1e5c0.jpg) (http://s44.photobucket.com/user/sin-tech/media/Record_zpsbfe1e5c0.jpg.html)
Do these control voltages go via a protection Diode? if so, it's going to be after the 82E21 pin 21 and before Upper bus card 57.
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I am getting 9.14V on pin 57 and Pin 11 on the 93 card header. My master flip switch is also not working.
Also, I might have popped the PICO fuse on the channel. Where do you get these?
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I'd change T11 on the 82E21 (I think it's a 4013) that should fix the master flip.
Pico fuses you can find on ebay
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There are like a 100 different pico fuses. What is the exact one?
Thanks so much.
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There are like a 100 different pico fuses. What is the exact one?
Thanks so much.
Is this for one of the channels? you should have two: +18V and -18V
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Yes. On the channels.
-Joe
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See attached, they're marked 2A (2 Amp)
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Found the fuse that went out. I ordered some 2A pico fuses off eBay. I changed T11, but it solved the problem with the master flip. Something is up. Is there a ribbon that sends everything out? If so, maybe the problem is there.
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The status buses are on ribbon S3
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I get the correct voltage on Pin 3 of the ribbon going down to the motherboard. After the motherboard the voltage goes down to 3.0V to each channel on Pin 57 of the Upper Bus. My console has the VCA Inhibit Mod. Do you think this has something to do with it?
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I'd maybe pull the links between buckets, make sure none of the modules are puling this voltage down. I never saw a VCA to Mon inhibit, but would love to know more about that mod.
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My console has a "VCA to Mon Inhibit" which can be activated for the right hand side of the console to split the modes between left and right side (from centre section).
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My console has a "VCA to Mon Inhibit" which can be activate for the right hand side of the console to split the modes between left and right side (from centre section).
Same here
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Does anyone have schematics on that mod? I can't find them in my manual.
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Hey Guy's, was at Jim's place today, and he kindly gave me a folder of schematics for all the extra G mods/enhancements, including this one (I think)
Thanks Jim :-)))
Update.. yes! the schematic is present :)
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spectacular!!
Hey Guy's, was at Jim's place today, and he kindly gave me a folder of schematics for all the extra G mods/enhancements, including this one (I think)
Thanks Jim :-)))
Update.. yes! the schematic is present :)
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Here's the schematic, not had a chance to scan all the rest, so a quick pic:
(http://i44.photobucket.com/albums/f23/sin-tech/VCAtoMonInhibit_zps57602365.jpg) (http://s44.photobucket.com/user/sin-tech/media/VCAtoMonInhibit_zps57602365.jpg.html)