need help about a wj-mx12 problem...

[phax148]

hi guys...

at first - sorry about my english - but i try my best to explain my problem....

i have a panasonic wj-mx12 mixer and im a little bit proud of it.
but, some days ago i recognized a little defect on that mixer - or maybe it is not supported by that mixer or whatever...

following situation:

have 2 vcr. one plugged in as source1 the other one on source2.
wenn the t-bar is only on source2 and i switch off vcr1 (which is not "on air" --> master out) then the picture with source2 scrolls 1 or 2 times. so source2 influences source1 even though it (s1) is not on air.

reverse - source1 is on air and putting off vcr2 doesnt influence the master out.

is that a known problem or is my mixer simply broken???

maybe if someone here has also a mx12 and can qickly build up this setup and try if he has also that effect.

1k thx ahead
phax148

[syzygy]

I don't have an MX-12 but this sounds like a synching issue to me.

The VJCentral review:

http://www.vjcentral.com/hardware/show/387

mentions that the mixer uses a frame synchroniser and that there are some issues with this.

[wellREDman]

yeah does sound like a sych prob,
few questions, have you tried swopping the decks round?
when you say switch off do you mean kill power or just press stop?
im pretty sure the 12 uses one of the inputs as reference and then sychs to the other, but i cant remmeber which
have you tried it with another signal, say from a camera?

[ToddGraft]

That's right m8
The MX12 has a TBC (time based corrector) on source 1 only. (MX30+50 on both) This means that when you turn off the signal, the signal from source 2 loses sync momentarily. If you have source 1 playing alone,it will not be affected by turning off source 2, because it has the TBC. If you FFand Rew on source 1, you will lose sync on source 2and get scrolling interference.

At least that's what I think I remember.:nod:

[MoRpH]

Yep your all correct as per my VJC review :) exactly what Todd said. There is nothing "wrong" with your MX12, thats just the way it works :)

[Anyone]

yup, I can confirm this with my MX12

[phax148]

hu , so many replys :)

1000 thanx all of you...

so - in my opinion - this mixer is useless... mhhh

maybe someone has experience with self-build add-ons.
maybe a switcher or something like that could the mixer "say: DONT SCROLL DURING SWITCHING EXTERNAL FROM A TO B" :)

i found a little pic here
http://www.vjcentral.com/hardware/show/202

he has 6 inputs --> 1 input, right? or do i misunderstand.

sorry guys, im not a technican - only an artist :)
but maybe theres someone who has some ideas how to "fix" that problem...?

thanx ahead
phax148

[MoRpH]

No its NOT A PROBLEM that needs to be fixed, get over it work around it mate others have been for years. Just run a stable source into the input its syncing too, EG a scan convertor, or PC video out, somethat your not going to stuff about with.

[wellREDman]

basically phax, u need to send pretty much any signal other than that of a vcr into it, anything that will send a continuous stream of video , a camera would be ideal, or as morph said a pc output or a scan converter,
it is the interruption in the flow that is causing the roll
i am not sure whether vcd/ dvd players flow evenly from image to black/menu screen when you press stop, anyone care to comment?

(or you could just put an mx50 between the vcr and the mx12 :p that should sort it :nod: )

[sleepytom]

DVDs and VCDs genrally output a stable uninterupted signal - it is only tape machines that will lose sync on stop / FF /RW

[MoRpH]

Originally posted by wellREDman
(or you could just put an mx50 between the vcr and the mx12 :p that should sort it :nod: )

Yeah thats why I normally have my MX1 up stream of any panasonic, that way they get solid sync... MX1 has full dual field, TBC none of this frame sync junk.

[phax148]

sorry guys - i think my english is too bad...

you all will say, it is not possible to prevent that scroll?
my idea was to switch externely between 6 sources (i have build a tiny - so called - switch-box).

it has 6 ins and 1 out which goes into the mx12.
of course -when im switching on that box the signal is really unstable --> causes scroll.

what i want to know is - maybe you all said that before, but i didnt understand :// - if theres a possibility to work with that switchbox.

is it right to feed my mixer on source a with a stable signal (e.g. computer or whatever) and on source2 the switchbox will work?

is possible - with help of some technical components EXCEPT another mixer - to prevent that scroll. maybe another switcher or whatever.

sorry guys - but this all new for me...

hope i will not go one everybodys nerves.

thanx ahead
phax148

[MoRpH]

is it right to feed my mixer on source a with a stable signal (e.g. computer or whatever) and on source2 the switchbox will work? Yes, don't run the switch into the input that is generating the sync, and make sure when you go to switch you have completely removed the input the switch s on from the mix completely.

[wellREDman]

you might also look into spending a little more on your switcher, if you get a security cam switcher you can get ones where the circuit is "clamped" so causes less of a glitch, sometimes hard switchers ("clunk boxes" i think is the ozzie term for them) sometimes cause a glitch down the system even on a mixer with sych on all channels.

[MoRpH]

that would be crunch box (not claiming to have invented it, the term, but its what I been calling it since b4 I was calling myself a VJ :P )

[wellREDman]

i stand corrected, mind you i did aquire the term from a kiwi and you know what you antipodeans' accents are like
actually i think i prefer clunk to crunch

[MoRpH]

Well it very well might be a CLUNK BOX over there, strange ppl that they are :p

[burstingfist]

Put your unstable signal on source 1 of the MX-12. The MX-12 uses the signal of video source 2 as the sync source. You should notice much less video disturbance when switching (I use a cheapo radio shack switcher).

But, yeah, the videonics mixers reign supreme when it comes to sync issues...

[burstingfist]

I used my MX12 last night for the first time at a gig. I was very satisfied with it's performance capabilities. I used a clunk box(2 live feeds & one VCR) on vid1 and a computer on vid2 and had no sync issues whatsoever.

I do recommend using the preview as your main output and one of the record outs as your preview. I would definitely advise that you hold on to your MX12, it may not be the best mixer in terms of features and inputs, but it is a solid unit with fast switching.

I was talking to a guy last night that has a Videonics MX1 and he said "I wish I had an MX12 for performances". This makes me feel a little better for settling on the MX12, because I really wanted an MX1, but it was out of my price range.

The MX20 is really nice too. Seemed to be responsive and more inputs and features (more expensive though)