New Calrec M Series owner, hello

With a comprehensive range of mixing consoles, Calrec has been a manufacturer of high quality audio products since 1964.

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Re: New Calrec M Series owner, hello

Postby GJC Designs » Fri Nov 05, 2010 12:24 am

Hi Alex,

Of necessity of time, these answers are short.... I will try to be fuller later when time permits......

The console can be removed from the frame to give you two smaller parts for easier moving. In the side bulkhead plates there are screws that hold the console unit into the stand frame - in the fader-bed area, up in the meter area, low at the back of the console. The console then swivels upwards from the fader bed, its pivot point being the large cross-beam under the belly of the desk. It's a 2 man job; for safety 3 or 4 men are better.

Phantom is switched externally; usually on or near a patchbay.

Using Bantams or GPO patch strips for mics is OK and common studio practice. Where it gets a bad rep is that those who are not in the know just use the common line-level practice of half-normalling. Full normalling is best.

Fader overpress is for PFL.

Fader end switches are used for fader-start, red-light & similar.

The tech manuals are required for exact info on edac functions; they should have come with the desk. Contact Calrec customer service with the desk serial number details. They MAY have details on file, no guarantee though. You need the System Diagram.

Gareth.
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Re: New Calrec M Series owner, hello

Postby Factory Street » Fri Nov 05, 2010 4:02 pm

Thanks Gareth,
The desk is now in the store room, ready for work. :P
I have the serial :P couldn't get to it while it was in the van.
I have the edac pin outs in pdf form but thats all so I'll contact Calrec on monday about getting hold of the system diagram.

I don't fully understand the phantom power thing yet, I am not sure how to configure the patch bay without using half normalling to get it to do one of the thing that makes it really useful... this throws the tape return switching via the patchbay plan into doubt....
I really do need the system diagram in order to get my head round it.

Not far off powering it up now though :P
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Re: New Calrec M Series owner, hello

Postby DraytonTom » Fri Nov 05, 2010 4:38 pm

Hi Alex

I am still trying to work out reverse engineering the RC1552 Modules that I have. I seem to remember that when looking at the Ebay listing of your console your Channel routing modules looked very similair to mine, only that the send numbering went from the bottom of the module to the top, rather than the other way round on the ones I have.
My initial though was that if you normaled your patchbay so that your tape returns fed from the channel insert return, by pressing the Insert Pre EQ switch(with nothing patched at the patchbay) your tape returns would appear at the top of your PQ channel strips (post gain/trim).
This is assuming that it is possible to switch the insert loop out on the RC module. I would have thought you would be able to. The only option seems to be to switch it pre EQ or Post Fader, but then again I havent powered up the modules yet, so the illumination of the associated LED might provide more of a clue.
The major draw back is that you couldn't use the Insert point during mix down.
From my limited knowledge, the other thing that might be possible is to configure the PQ modules so that the line inputs are post trim. Then you could use the line inputs as your tape returns without messing up your session gain structure...
Just a few thoughts over a glass of wine...

Cheers
Tom
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Re: New Calrec M Series owner, hello

Postby Factory Street » Fri Nov 05, 2010 4:48 pm

Thanks Tom,
Good ones, lots of thinking to do.
It has also occured to me that lots of my questions will be answered by just powering it up and trying things out with a couple of patch leads, and getting a meter on the edac connectors.
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Re: New Calrec M Series owner, hello

Postby DraytonTom » Fri Nov 05, 2010 5:29 pm

True enough,
Although I would be very careful firing it up for the first time.
I know the listing said that it had been serviced prior to sale, but I would read the threads in this forum about reconditioning/refurbishing M-series variants and firing them up for the first time.
Theres some great advice in there that could help you protect your investment.
Checking power supplies prior to connecting to the console etc etc.
In this respect I have an easier time than you in that my m-series is currently only 2 modules and some ratty Veroboard cobbled together... and so far not even powered up!
Good luck

Tom
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Re: New Calrec M Series owner, hello

Postby Factory Street » Sat Nov 06, 2010 5:16 am

Cheers Tom,
Yes I was going to be testing voltages today on the power supplies and having a look inside them to see if the caps had been changed in them.
I do know the modules etc in the desk have the original caps, so plenty to do there (at least they won't cause any damage when they fail.)
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Re: New Calrec M Series owner, hello

Postby GJC Designs » Sat Nov 06, 2010 3:17 pm

The photos show a phantom power injector for 24 channels that I have designed to go with my M-Series console.
There is a 2U case that houses 2 of these boards that is located in-line between the console and the patchbay. It does not matter whether the unit is at the console or at the patchbay. As well as 48V phantom, +9V is required to illuminate the LEDs in the switches.

The card has been designed as 24 channels so as to suit a variety of consoles; use one card & a front panel machined for 24 switches for a 24 mic-input console, or use 2 cards in a case machinned for 48 switches for a 36 or 48 input console.

Internal wiring is individual screened pairs, so the external connector type is not really important; specify the rear panel to suit your own interface preferences and wire accordingly.

The cards & rack unit are not limited to Calrec consoles but are suitable for any console that does not have individual channel phantom switches. e.g. Neve 51 series.

Regards,

Gareth.
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Re: New Calrec M Series owner, hello

Postby Factory Street » Tue Nov 09, 2010 8:01 am

They look pretty good Gareth, I'll have a think about them once I get the basic stuff up and running.

So I have fired it up, carefully, and all the correct voltages are appearing at the correct places. The problem I have is that the "power supply fail" lamp is flashing.
At first I suspected the phantom power because the LEDs on the back weren't lit. this turned out to just be a dead LED so now that is sorted but the light keeps flashing.
I have at least 1 of each module in place, everything seems to work, I haven't passed any audio yet, I will try that this afternoon.
Any ideas?
i put some pictures up on facebook ....
http://www.facebook.com/album.php?aid=2 ... 1af16a1577
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Re: New Calrec M Series owner, hello

Postby Factory Street » Tue Nov 09, 2010 1:19 pm

It sounds good!
I haven't tested everything yet but the audio coming through is great, clean, plenty of headroom.
The switching is quiet, I can send stuff all over, the monitor section is making a bit more sense now. I have to wire up lots of edacs before I can get it into the studio but the basics alll seem to be right.....
Apart from the "psu fail" light it wont stop flashing!
I will get to the bottom of it eventually
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Re: New Calrec M Series owner, hello

Postby Factory Street » Fri Nov 12, 2010 11:54 am

So, I am pretty sure it's the phantom power.
It's fine where it goes into the desk, however the talkback mic is only getting 17v.
As far as tracing the wires goes from both ends they dissapear into the looms, I won't be able to trace them without pulling the loom apart. I don't want to do that.
Does anyone know where the phantom power is distributed in the desk?
The audio and logic supplies are nice and steady and everything sounds good and seems to work. 8)
I am waiting for a supply of edac connectors and I can get some wiring done.
All looking pretty straight forward and I am starting to get my head round the monitor section, it's pretty simple to use but really flexible, amazing design, the eq is brilliant! the compressors are really transparent, I haven't had a chance to really put them through their paces yet though.
I am waiting on Calrec to look and see if they have copies of the manuals, then see if I can afford them....
So any ideas about the location of the phantom going wrong would be great.
Cheers
Alex
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