VCA to Monitors Not Working

[perfectsnd]

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?

[sintech]

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)

[perfectsnd]

What should pin 21 when checked with a meter?

[sintech]

What should pin 21 when checked with a meter?

+17V  for VCA to Mon active

+11v for not active

[perfectsnd]

I have +11.8V for not active and + 18.26V when active on Pin 21.  Where is the next place to check?

[sintech]

That looks good.. you sure VCA to Mon is not working?

[perfectsnd]

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.

[sintech]

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





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.

[perfectsnd]

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?

[sintech]

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

[perfectsnd]

There are like a 100 different pico fuses. What is the exact one?

Thanks so much.

[sintech]

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

[perfectsnd]

Yes. On the channels.

-Joe

[sintech]

See attached, they're marked 2A (2 Amp)

[perfectsnd]

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.