For owners of the JVC 30K D-Theater HD VHS Deck only.
I've owned my 30K for well over a year. I've been very pleased with it, and have also used it with the DVE (Digital Video Essentials) test tapes, both 1080I and 720P. Not long after getting the DVE tapes, I've noticed that the 720P tape was much sharper than the 1080I tape, though both were somewhat soft, however the machine was great with the HD tapes that I have.
Once while randomly scoping the output of the 30K thru my transcoder, I noticed a loss in amplitude on the high end of the burst pattern. At first I suspected the transcoder, because I did not expect a HF roll-off be to coming from a brand new deck. Playing and poking around in the transcoder eventually lead me to the Y input, and once there, I noticed that the roll-off was coming out of the deck itself. This puzzled me, because why would this problem exist. I checked the manual for the ability to enable/disable filters or such, but all I could found was a '3DNR' button on the front panel. But this did not effect that roll-off at all
. I since searched the web, and found a discussion on this same issue somewhere on the internet, but no cure. I then put the matter on hold, to look at another day. That other day came, and I'm now able to get the deck to pass every test that relates to that roll-off problem. The amplitude is now there, and the unit looks so much better. The colors are even so much better. So much so that it's like having a different machine.
One of my D-Theater tapes is X-men. X-men has always looked good, but somewhat dull in some of the darker scenes. So it was not one of my favorites. After the mod, I've since watched it several times, just to see how much detail was hiding behind that haze. The tape is now enjoyable.
If this is you, and you feel that you can do very fine soldering, here is what you'll need to get started:
- 3 each 4 ohm metal film 1% 1/8 axial lead resistors.
- 3 each FB-2 mini feriite beads - here: http://www.palomar-engineers.com/Fer...ite_beads.html
You're going to need a fine tip soldering iron and some tweazers.
We'll get back to this thread later, I'll allow time for to get the above parts.
If you're not quite skillful with soldering, and don't have the smaller soldering tools - don't try this.