Cabling a TR806 rack - screw terminals wtf? Sorted!

Are you building something? Share your resources with the locals - for more in depth D.I.Y. head to The Lab

Moderators: rick, Mark Bassett

Cabling a TR806 rack - screw terminals wtf? Sorted!

Postby Drumstruck » Tue Apr 01, 2014 2:00 pm

Hi my good fellows and lady,

I have this luverly old piece of kit and request some assistance on connecting the screw terminals for the QLZ quad pres ....

fyi it's a Valley People TR806 rack - fully populated with their 800 series modules. So far I've worked out the Maxi-Qs (4) and Gain Brains (2) and Kepex gates (2) - they have dedicated balanced input terminals and dedicated unbalanced output terminals.

But I am stumped with the QLZ Quad pre..... it's a Quad pre but there are only 2 banks of screw terminals for the 4 pres.....

Here are some photos:

TR806 front trock.jpg

TR806 rear trock.jpg

this one is sideways.....
TR806 terminals trock.jpg



thanks
You do not have the required permissions to view the files attached to this post.
Last edited by Drumstruck on Fri Apr 04, 2014 3:33 pm, edited 1 time in total.
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Chinagraf » Tue Apr 01, 2014 2:07 pm

Maybe there are no in's on the back for the QLZ as they are on the front, so the back connector instead of 2 in and 2 out is 4 out?
User avatar
Chinagraf
Valued Contributor
Valued Contributor
 
Posts: 1608
Joined: Wed Jun 22, 2005 1:09 am
Location: Melbourne

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Paul Maybury » Tue Apr 01, 2014 2:20 pm

Nice rack! Those Maxi Q's are wild.
I'd say Chinagraph is right about the terminals for the QLZ's.
Cheers,
Paul
Paul Maybury
Frequent Contributor
Frequent Contributor
 
Posts: 705
Joined: Tue Nov 17, 2009 3:07 pm
Location: Melbourne

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Drumstruck » Tue Apr 01, 2014 2:27 pm

Thanks Gents - I think there must be a way to do this as I received enough pigtailed XLRs for 12 ins / 12 outs when I purchased the unit.

8 of each (XLR M and XLR F) are used for the EQs/GBs/Kepex so that leaves 4 of each for the QLZs for rear I/O.......

I suspect that the Key terminals have something to do with it.....


??????????
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Chinagraf » Tue Apr 01, 2014 2:49 pm

Anything is possible, time to get the multimeter out?
User avatar
Chinagraf
Valued Contributor
Valued Contributor
 
Posts: 1608
Joined: Wed Jun 22, 2005 1:09 am
Location: Melbourne

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Drumstruck » Tue Apr 01, 2014 4:28 pm

I think you may be right Andy.....

I saw that Rob had racked a pair of those QLZ pres for Angus so I would guess that he knows them outside in...

So, I removed the QLZ module from the rack and did some eyeballing:
- it has 2 circuit boards
- the LHS card has the 4 XLR inputs and looks like it links to 8+4 connections in the PCI-style slots for terminal bank 1
- it bridges to the RHS card via a multi-pin connector
- the RHS card has the input gain / phase switches and also has similar 8+4 connections in the slot for terminal bank 2

So.... I'm guessing that screw terminal bank 1 will be inputs and screw terminal bank 2 will be outputs.....


Searching the web I've found .pdf operating manuals for the Gain Brain II / Kepex II and some other VP modules if anyone wants a copy .... the Key terminals appear to be what we'd call sidechain nowadays for the Kepex - though you guys probably knew that.

Nothing to be found for the QLZ and the TR806 rack....


Interesting fiddling and thinking B-)
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Chinagraf » Tue Apr 01, 2014 6:15 pm

Doesn't that leave you one i/p and o/p short? There's 9 connectors per barrier strip yeah? Unless they all share one ground on each strip. Have you tried the geekslutz sub forum on gearslutz? Someone there might know. I had a rack of 8 qlz's but they came in there own rack. I think I swapped them for some magic beans or somethin.
User avatar
Chinagraf
Valued Contributor
Valued Contributor
 
Posts: 1608
Joined: Wed Jun 22, 2005 1:09 am
Location: Melbourne

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Drumstruck » Wed Apr 02, 2014 7:50 am

Thanks Andy,

There are 8 screw terminals per strip but I'm fairly sure that the -ive shares ground. See pic 3 for the layout (3 in / 3 key / 2 out) showing balanced ins / key and unbalanced outs.

I've done the search on GS - there are quite a few short threads and one more useful one where a guy got his TR806 sorted out but he didn't have the QLZ modules....

I'll be doing some multi- testing today and will update :-)
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Drumstruck » Wed Apr 02, 2014 10:26 am

Update.... the multi-meter tells me that:

Barrier strip 1 connects to the front panel XLR inputs 1-4 from top to bottom (unbalanced)
XLR input pin 2 = +ive
XLR input pin 3 = -ive
XLR input pin 1 = grnd and (4 of them) connect to the ground terminals on all other barrier strips and to the chassis

So that explains the inputs - available from both the front panel XLRs and the rear barrier strip - goodness so far.


Next I'll be checking the outputs :-B
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast

Re: Cabling a TR806 rack - screw terminals wtf? help.....

Postby Drumstruck » Thu Apr 03, 2014 3:17 pm

another day on.......

The Maxi-Qs are outta sight - nice sound and range from surgical to broadbrush

The Gain Brain IIs have a few intermittents and require someone with more nouse than me to remedy....

The Kepex IIs - one shows me how drastic these can be / the other has an intermittent in/out switch... actually, it's an out/out switch atm....

Buggered if I can get the QLZ connections worked out yet - some weird things happening with the +/- phase switch - more testing...... (-|
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast

Re: Cabling a TR806 rack - screw terminals wtf? Sorted!

Postby Drumstruck » Fri Apr 04, 2014 3:23 pm

Yes!Yes!Yes!Yes!Yes!Yes!Yes!Yes!!!!! The QLZ outputs have been nutted out!

For future reference, in the old days hot was cold and cold was hot, so instead of connecting XLR pin 2 to +ive one needs to connect XLR pin 1 to +ive, and XLR pin 1 to ground ....

- Barrier strip 2 is the outputs as I suspected:
- Terminal 1 is output 1
- Terminal 2 is output 2
- Terminal 3 is ground
- Terminal 4 is output 3
- Terminal 5 is output 4
- Terminal 6 is ground
- Terminal 7 I haven't a clue and it doesn't matter....
- Terminal 8 is ground

Barrier strip 1 is the inputs (and these ins + the front XLR ins work):
- Terminal 1 is input 1
- Terminal 2 is ground + balance
- Terminal 3 is input 2
- Terminal 4 is ground + balance
- Terminal 5 is output 3
- Terminal 6 is ground + balance
- Terminal 7 is input 4
- Terminal 8 is ground + balance

whew

Next back to the Gain Brains and Kepex to see if my luck holds on a bit longer ;)
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast

Re: Cabling a TR806 rack - screw terminals wtf? Sorted!

Postby Chinagraf » Fri Apr 04, 2014 3:35 pm

Good news Ian. I should have mentioned that the Valley stuff was pin 3 hot. I was aware of that. Same as the ADR stuff. I once got given a stereo F760 because it didn't work anymore, but it turns out once I rewired it to pin 2 hot it worked fine.
User avatar
Chinagraf
Valued Contributor
Valued Contributor
 
Posts: 1608
Joined: Wed Jun 22, 2005 1:09 am
Location: Melbourne

Re: Cabling a TR806 rack - screw terminals wtf? Sorted!

Postby Drumstruck » Fri Apr 04, 2014 4:25 pm

Thanks again Andy - I tried the cold for hot as a last resort and luckily it worked :-).

For the Gain Brains, Maxi-Qs and Kepex it doesn't matter - they run either way. Hopefully this will help any other t'rockers who get some of this gear.
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast

Re: Cabling a TR806 rack - screw terminals wtf? Sorted!

Postby Drumstruck » Mon Apr 07, 2014 12:33 pm

Perhaps the penultimate post in this thread:

A bit of terminal cleaning / card seating and wiring integrity checking has every module working now.

All -ives are connected to +ive terminals
All +ives are connected to -ive terminals (except on the QLZ outs where the +ives aren't connected to anything)
All grounds are grounded

The intermittents have reduced to negligible and it's looking like a bit of pot and switch lube may solve those issues.

my goodness :-)
Ian Dare
Drumstruck
Valued Contributor
Valued Contributor
 
Posts: 1589
Joined: Fri Sep 17, 2010 12:37 pm
Location: NSW South Coast


Return to D.I.Y.

Who is online

Users browsing this forum: No registered users and 2 guests