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4K,6K,8K Series / Help MASTER READY GROUP and flashing switches
« Last post by Franz on August 05, 2020, 12:33:34 AM »
Hi everybody. I've got a big problem that suddenly came up. I'm not a technician and unfortunately there are no technicians in my area and I totally make up to you all. I'd be grateful if you could help me. Suddenly all the console channels started blinking and all the CUEs went crazy with current noises. In addition, the "master ready group" button always stays on and doesn't even turn off when you press it. I couldn't find the card for the master ready group in the SL651G central section on the service manual. Do you know which one it is? And, in general, have you ever seen this kind of problem?

I've attached a video to show you the kind of problem (zipped video)

Thank you all so much.
Franz.


Thank you all so much.
Franz.
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Thanks Anthony. I'll have to package it up a little more nicely so I can put the metering distro gear someplace safer.
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The original design fed an unbalanced, unbuffered signal from the 651 via S18E to the 55E distribution board, then from the 55E to the meters. All unbalabced / unbuffered.

The mod allows for a balanced signal off the patch bay, which is then buffered via that custom board.
Otherwise it is a considerably long run which could introduce noise directly on to the buss.

You'll note that the latter 237E meter distribution board has on board buffering, via Conn1 and Conn2.

Anthony.
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Oh! Very interesting. is it modded in just to take the signal from a later part of the Cue signal chain, or is there a deeper reason for adding it? Either way, if I keep it I'd probably have to rebuild it on a new board.
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Buffering from the patch bay to the Cue meters.
I was about to build one myself.

The unbalanced feed from the 651 via S18E is cut at the ribbon cable coming off the monitoring cards, and is (I believe) fed direct from the patch bay instead.
Common mod.

Anthony.
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Hey all,

I'd been posting here as subspacesound for a while, and for webhosting reasons I don't have access to that account or that email anymore. (I know this account is from 2018 - had trouble logging in to it for a long time and the old account was already registered) Regardless, my console is a 1985/86 6056E. That's kind of thrashed.
 
The console was pulled out of the studio in April, and after no luck brokering it, I've started reconfiguring it to 48ch and fixing a ton of "small" problems. Number one is the mess that is my E55 card.

Here's my dilemma: The meter distribution card seems to mostly work, with the exception of the penthouse status lights. HOWEVER, there's this horrid mod board frankensteined to it and I can't figure out its intended function. Does anyone have experience with a board like this and what it does? Why is it bypassing parts of the original card? I guess more importantly, is it integral to some part of the metering distribution, or would it be smart to remove it and put E55 back to factory? The console is being completely rebuilt, so there's no point in keeping old hacks around if they aren't mission-critical. (you can also see the mod board is broken and E55 is cracked - just a few of the many joys of this console)

Thanks!
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4K,6K,8K Series / Re: Missing Diode for External to Monitors
« Last post by walrus on July 27, 2020, 04:07:13 PM »
The assumption would be a 1N4148/1N914 type of diode.
Pin 53 is the 0v for the plus/minus 18v rails. Where does the other end of the wire go?
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4K,6K,8K Series / Re: Headphone Monitoring wiring
« Last post by drpat on July 20, 2020, 01:56:48 PM »
A mini input would have been amazing! Tho.. i get it...  in the 80's? for what? haha

Switchcraft EH35MMSSC connector to a BB DRV134 always does the trick for me.

I usually mount the connector to a "D" type XLR hole on the rental bay of the credenza, then tap some power from a unused power supply jack to power the BB chip. The BB chip and associated circuitry is EASILY built on one of those tiny project boards from RatShack.

Pretty easy 1/2 day project when you finally get sick of listening to rap songs cranked up through a tinny iPhone speaker.
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4K,6K,8K Series / Missing Diode for External to Monitors
« Last post by mjlaudio on July 18, 2020, 08:50:24 PM »
Hi Everyone

I seem to have "lost" the diode that connects on the back side of the External to Monitors Row. It seems to come off pin 53. Im not able to see it in my schematics.

Anyone know what it might be?

I posted a picture for addition info.
There is a similar diode on the Externals to SLS row.

Also my schematics never list values for Diodes so im not sure what diodes I need.
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That damn heat shrink again!
Not to mention the corrosion on the solder joints.

Does anyone have a good method for cleaning up the corrosion, other than mechanically scraping at the solder joints?
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