Quote:
Originally Posted by Barry777
Hi Ed,
I don't have the CX box for the VP-1000. I found the unit at the Goodwill for $9.99 and was always a little curious about them, so I brought it home. To my surprise and pleasure, it worked great for the most part.
I know a guy who has the service manual and some of the jigs and gauges for it, but I'm not enough of a LD enthusiast to make the investment.
I do notice some snow and video noise on some discs, but not enough to really bother me.
If you don't mind, I might be picking your brain from time to time about these great JVC pro machines. My immediate question is whether they have some sort of circuit to ignore the anti-copy signal, as I don't seem to have any trouble at all copying movies from - well, anything! My uneducated guess is that they had to duplicate movies that were manufactured with the anti-copy signals, and thus needed to somehow bypass the protection.
Most of my other questions deal with using SMPTE time code, as there doesn't seem to be an introductory tutorial on its basic use. I'd like to sync 2 or more recording VCR's with Alesis ADAT machines so I can record local bands and myself playing, and have 16 tracks of audio - or 20+ tracks if you count the normal and Hi-Fi audio functions in the VCR's. I understand you need an Alesis BRC to translate the time code between the ADAT's and VCR's, but haven't gotten quite that far yet.
Nothing to bug you about on the VCR's, as I was able to get them all working with fairly simple mechanical fixes, and was able to confirm a bad video head (or something on the flying head preamp board) using a substitution signal from a VC93. Funny that I have pretty good head protrusion on the drum and no visible broken ferrite chunks, so possibly the preamp - but that's as far as I felt like going that day.
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I have the training and service manuals for the VP-1000, and the predecessor commercial player PR7820, an alignment disc, but no jigs. Yours uses the old Helium-Neon tube laser. I have an optical laser block out of one, and a laser from one set up with some tracking mirrors X-Y for horizontal and vertical, driven with a small stereo amplifier, had this set up in the den years ago to draw Lissajous patterns on the wall!
Laserdiscs can get noisy when the aluminum reflective layer starts to break down. Some much worse than others that still play remarkably well. But even new discs would have a speck here and there, or an occasional crawling dot as a minor defect passed by.
I think my friend has a CX box if you ever decide you need one.
Those pro machines were probably designed to ignore the macrovision garbage, and some may have manually adjustable video rec level controls so that also makes the copyguard signal ineffective since that messes with the recorder's video record automatic gain control to disrupt the picture.
You have a nice project getting all that to interface and work together.
Without looking as I no longer have access to any of the JVC service manuals at the old shop, if the heads seem OK might be a failed electrolytic on the head amp board, or on the cylinder stator board if it has a similar setup I am thinking about as many JVCs had in the late 80s-early 90s which caused the phase of the head-switching signal to be all out of whack from where it's supposed to be. I've also seen heads that were clogged with something that would not clean off no matter what, and I would have to use a head lapping tape to polish off the crud. What happens if you record on that one with no playback and play that tape on a good machine?