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Static crackling inputs when armed to record

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Static crackling inputs when armed to record

Postby funk » Sat Dec 29, 2012 11:30 pm

I have moved and edited this from the D8B forum as it was in the wrong place.

Sorry if this has been covered before, i did look,.. honest i did
i have a d8b and a hdr, connected by light pipe
oiginal Mackie clock card in the Hdr BNC output with the 75 ohm pressed in, to the BNC input apogee clock card on the D8B,
The HDR is master.

I have had the problem a few years now, but never bothered with it as was using mainly only 1 or two tracks at a time
first noticed when arming all tracks years ago, all the meter bridge on tape/mon desk light up and the bars on the hdr
and monitor.


1) when i arm a single track ready to record all is fine
2) when i arm say 1,2,3,4 all is ok
3) when i arm 1,2,3,4,5,6,7 i get all sorts of pops crackling static noise
4) when i remove 7 then all is fine ( but arming just 7 is fine)
5) if i arm 1,2,3,4 and 7 static is back
6) 1,3,6,8 static is back
any ideas help would be great
----------------------------------------------------------------------------------------------------------------------------------------------
Some more testing today....
7) i can arm all 9 through to 24 tracks, no static.
8) i can arm all 2,4,6,8, and 9 through to 24 tracks, no static
9) seems the bad tracks are 1 3 5 7, together = static

Next step process of elimination,
10) moved the light pipes around still same
11) swapped cards around in the hdr still same
12) moved light pipes on the hdr from 1/8 to 17/24 the static now moves to channels 17/24 and still in order, ie
17/19/21/23
so the problem seems to be inside the HDR
so i took hdr appart and...
13) took the clock card out cleaned it
14) then the light pipe card cage cleaned and the cct board connected to it
15) and all related cables
there was some dust on the rear (see pic) but all else looks ok.
reassembled and hay presto.................. still the same.
Ideas ??? i could just multitrack on everything except 1/8 then use 1/8 as work or single tracks, but
just want it right or it will eat away at me.
not sure if any help here is a pic of my clock card and back of cage
IMG_3968.jpg
IMG_3968.jpg (Array KiB) Viewed 2000 times

IMG_3971.jpg
IMG_3971.jpg (Array KiB) Viewed 2000 times
Never drive faster than your guardian angel can fly!
"Funk is what you dont play"........GREAT.....im off to the pub then,
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funk
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Re: Static crackling inputs when armed to record

Postby Bruce Graham » Mon Dec 31, 2012 1:56 am

Hey Funk;

Sorry to hear about your HDR problems. I don't have an answer but can lead you to the guy who may be able to help you. Mike Rivers (a member of the forum) is the HDR Guru. He worked on the HDR for Mackie.

He can be found at http://mysite.verizon.net/mikerivers/index.html.

He is a great guy and hopefuly can help.

Happy new year and keep the force.

Bruce
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Re: Static crackling inputs when armed to record

Postby funk » Mon Dec 31, 2012 3:06 am

Cheers bruce i will check that out.
Never drive faster than your guardian angel can fly!
"Funk is what you dont play"........GREAT.....im off to the pub then,
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Re: Static crackling inputs when armed to record

Postby Crash » Mon Dec 31, 2012 3:43 am

Did you do any card swapping on the d8b side? From what I have read so far, you could have the issue on that side.
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Re: Static crackling inputs when armed to record

Postby funk » Tue Jan 01, 2013 12:29 am

OMFG.. Crash i dont belive it, i have done everything except swap the two outer cards in the D8B, i did swap cards 1/8 and 9/16 and still same, wired, but now seems all is ok,(for now, i may be back !!!)
whats your address al send ya a big bar of choc,
cheers for all your help
oh and happy new year
im just off the pub... yee haaa
Never drive faster than your guardian angel can fly!
"Funk is what you dont play"........GREAT.....im off to the pub then,
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Re: Static crackling inputs when armed to record

Postby Crash » Wed Jan 02, 2013 12:32 am

Glad to hear you got it sorted out.
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