Sony Bvh-3100 Service Manual
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Hi everybody. I've published a couple of query on another 'bovine' community forum I didn't got any response. So I really hope somebody will end up being capable to assist me right here. I would like to adjust/align a Sóny BVH-2000. In the manual, Sony use the white area of the alignment tape (tracking for instance).
I don't have got the sony position tape, but a 'multipurpose reference cassette for Kind G' from Ampéx, which doésn't have got a white section. Is certainly there a section that I can make use of instead of the whitened indication?
On the Ampex tape, there's: Color Pubs/Ramp Matrix, black, Multiburst, Mod.Ramp, Pulse Bar, Programmed Dropouts, Red Field, Multipulse. If I actually require the Sony Record, does someone have one available, or can make me a copy?
About alignment tapes in common: the Sony positioning tape will be slit slightly wider than normal tape share, which is certainly to say, an alignment cassette is precisely one in . wide. Documenting stock is definitely in fact slit slightly narrower.
This is definitely very essential for correct tape route alignment, specifically the entry and escape instructions. Because of thát, and because án alignment record is recorded on specifically calibrated recorders, á dub of án alignment record will be the next thing to useless.
If you're placing up á BVH-2000, the 1st point you should do is the servo setup. Among some other stuff, this consists of reel torque calibration and sensor left arm adjustment.
This not only interacts with entry and leave guide position, a pressure issue will harm your alignment recording. You will need a electronic meter, oscilloscope (preferably four find), a complete one-hour fishing reel of cassette, and the set of calibration weights. As soon as the servos are lined up, you should furthermore examine the eccentricity of the upper drum to make certain it'beds properly centered on the spindle. The tolerance is incredibly little for this - much less than one micron. Put on't try to do this, or to alter the top drum, without the eccentricity gauge and tapered set up screws: you will extremely likely breeze up getting an out-óf-center drum seIf-destruct on oné of the céramic guideline flanges. Right now clear the entire tape route. Pure isopropyl alcoholic beverages should become adequate; if you have a persistent bit of oxide on a metallic information or tip, you can make use of xylene sparingly - then clear it off with alcoholic beverages.
Make sure everything is definitely dry just before threading up any record. Reverse the 'report inhibit change' before threading the alignment recording. Have fun with the initial area of the cassette with the monitoring knob in the pushed-in, standard environment, with the R/P head selected. Appear at the front advantage of the RL-12 board: you should observe four natural LEDs lit. On the handle cell, the CF Locking mechanism lighting should end up being on, and the servo caution lighting should become away.
If this can be what you get, the servo program is acting correctly and you should be capable to keep on with the positioning. Usually, some analysis work can be in purchase to find out what'beds producing the servos unsatisfied. Once everything's ended up established up mechanically ánd the servos are aligned, after that you check the tutorial positioning. You are searching to get a smooth RF envelope over the entire carry of the head (select the Ur/P mind, not the powerful tracking have fun with mind). The peak general RF should happen when the monitoring knob is usually structured, and should not really modify with it'beds moved into its default setting. If it will, you shift the stationary head set up somewhat side-to-side to get the RF top with the monitoring knob pushed in. Expand the RF display to appear carefully at the begin and finish of the cover.
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You should find a nearly square increase and fall, without a lot of waviness across the top. If you draw out the monitoring knob and convert it side-tó-side, the starting and closing edges of the cover should increase and fall with the relaxation of the relaxation of the package. If the increase or drop time is usually actually ratty, or doesn'testosterone levels complement up with the sleep of the envelope, you're going to require to modify the entry and/or exit manuals. This is certainly insanely touchy, and will quickly damage your upper drum unless you understand what you are doing. Many other students in my course managed to do specifically this, to the excellent discomfort of the instructor. If you expand the RF screen so that it centres on the overlap period (the portion of the drum't rotation where the major R/P mind tip can be between the get away and entrance manuals, and not in get in touch with with the record), you should observe something Iike this: Sony spécifies the white section of the recording for the path alignment, generally because white corresponds to thé highest RF company frequency, and a solid full-field indication will produce a consistent RF package over the whole check of the drum. Also though movie is recorded as an FM sign and therefore should have got a consistent amplitude regardless of the movie degree, real-world variants in RF frequency reaction for whatever reason will yield somewhat differing RF amounts that correlate to the movie degree.
If you put on't have got a solid white industry on your recording, you can nevertheless come quite close, especially if the check pattern is certainly consistent vertically (full-field color bars instead of SMPTE bars, for instance). The reddish colored field would become a good applicant, if it runs long plenty of.
Ultimately, once you get through all óf this, your device should end up being able to document and play standard recordings. The powerful tracking alignment is extremely specialized, and the procedure in the manual doesn't work quite properly - you can deliver the whole factor off the serious end very simply. Unless you need to do variable quickness play-back, I'd keep it on your own. This was one of the locations where it had been really useful to spend the two weeks in San Jose. Ideally this will provide you a good start, and guide you away from the greatest barriers. The unique poster asked me via information whether this position can be done without the tapered anchoring screws, or if that'h a deal-bréaker. For the sake of anyone who comes upon this thread afterwards, I'll blog post the answer here, as well.
Sony Bvh-3100
Also, I remembered a minor point about reassembly that I forgot in the direct message response. I probably shouldn't say that it can't be done, but it will become exceedingly challenging. If you verify the drum éccentricity and it stays within +/- half a micron or so, that's good - you put on't have got to get worried about it. If the top drum has been installed properly, this should be the case. In common, when you change the top drum, you eliminate the ornamental cover up and the coppér-plated amplifier set up; the drum is certainly attached to the spindIe with two aIlen-head cap screws.
Create a careful take note of how the internal circuit panel on the spindle outlines up with the external circuit plank on the drum, so that when you put the new drum on, you get it the correct method around (there's a 50-50 chance of obtaining it incorrect). Get rid of the previous drum, and meticulously fixed the brand-new drum on the spindle.
Make use of the tapered anchoring screws to in the beginning protected the top drum to thé spindle. The tapér acts to center up the drum; just get them finger small. Semi-automatic pistols 22 cal. After that, one at a period, replace each tapered screw with the allen-head cap screw, being careful not really to topple the drum out of positioning. Only tighten up the cap screws partway, so that they're also holding the drum in location, but not completely torqued down. lnstall the eccentricity measure (create sure it's i9000 driving the top component of the drum, and will be not in range with the head ideas). Generally, you will discover something like +/- 20 microns of error as you proceed the drum around the circle.
Lightly press the inner surface of the drum, aside from the measure, and notice which direction the filling device moves. Rotate the drum so that it offers the maximum error in the contrary direction, then lightly touch the inner part of thé drum opposite thé measure to provide the error down. Rotate the drum again, and discover the spot with the optimum error, and tap some more. Keep at it untiI you can turn the drum and move the needle much less than one mark tag (.
NECRAT wrote:Wé shotgunned all thé caps. That'h a lot of caps! Réminds me of refurbishing an old Datatek 20x10 routing switcher (circa late 1970s). All of the input and output amplifiers and every crosspoint experienced wet tantalum caps - aIl of which experienced to be replaced. Had taken me several weeks - of course, there had been the constant disruptions to do live photos and fix apparatus that the 'skill' held breaking up. We nevertheless have various BVH-2000s (two functioning, many for components), but aside from cleaning them, they haven't needed maintenance interest in quite a even though.
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They only get fired up when somebody wants a item of save footage, which can make me unfortunate until I remember the price of a brand-new higher drum. The last period I called a recording, it came people from around the developing who experienced never observed a reel-tó-reel VTR working before. Unfortunately, some of them were providers who tried to persuade me that the machine didn't work, and that l couldn't create it function.
Incorrect on both counts. The combination of two weeks of Sony training school plus many decades of keeping a bunch of BVH-2000 and -2500 machines (four at our train station, plus a lot at various other stations and manufacturing houses) makes for instead potent encounter. There't a upper drum fresh accessible on eBay, 17,682$.
Much better option I believe, AheadTeK, they possess refurbished upper drum for aróund 2300$. For the nip roller, thére's Térry's Crunch Roller who can refurb the roller if I send it tó him (around 55$). But generally there's another, even more costly alternate (200$), from Athan Corp, who have new touch roller made with a proprietary polyurethane materials (and also brand-new bearings). I'm not certain what to do, I know that Terry do a great job for the replacement unit of the 'plastic', but I want to end up being certain that the bearings are usually also top form. Atakama wrote:There's a higher drum brand-new accessible on eBay, 17,682$.
Better substitute I think, AheadTeK, they possess refurbished top drum for aróund 2300$. Those are usually two extremely different issues. The device you notice on eBay is the comprehensive set up that contains the lower drum (the engine, rotary transformers, fixed slant guidebook), the upper drum (the revolving component with the head tips), sliprings and brushes (which supply power for the preamp and dynamic tracking piezo assembly). It'beds pretty very much everything except fór the preamp ánd the ornamental cover up. The AheadTek unit is certainly a utilized top drum that offers typically long been refined to remove scratches, new head tips included or old tips moved out, and re-balanced.
A brand name new top drum generally provides about 90-100 microns of suggestion projection on the Ur/P and enjoy brain; when they wear down to abóut 50 microns, you begin having problems keeping head-to-tape get in touch with especially approaching the overlap period between the instructions. Replacing an upper drum can be a pretty skilled job that extremely often requires only minimal readjustment. Changing the lower drum will be much even more tough, and entails nearly overall mechanical video tape path position and servo alignment. There are usually only a few reasons to change a Iower drum: 1) The engine or its linked sensors has neglected (very uncommon); 2) A rotary transformer has hit a brick wall (really uncommon); 3) A helicopter crashed and ruined the VTR (very rare). 4) The slant information has used to the stage where the RF package in the middle of the scan is significantly different from the rest of the cover, looking like the ság in an older mattress. My expertise is certainly that a Iower drum will outIast about half á dozen upper percussion (supposing normal put on, not unintentional harm). In any case, you really should inquire whether the upper drum actually needs alternative.
If you measure the tip projection and get more than 50-60 microns, there's most likely more useful life staying. In our store, we would obtain about 5,000 hrs on an upper drum; that't approximately 125 hrs per micron. So actually a properly used head with 65 microns is usually still possibly great for nearly 1,000 hours. For the nip roller, thére's Térry's Touch Roller who can refurb the roller if I send it tó him (around 55$). But now there's another, more costly substitute (200$), from Athan Corp, who have new pinch roller made with a proprietary polyurethane materials (and also brand-new bearings).
I'michael not certain what to perform, I know that Terry do a excellent work for the replacement of the 'plastic', but I wish to be certain that the bearings are usually also top form. There are usually several sets of bearings that affect record path efficiency to varying levels: the nip roller, the timér roller, and several roller instructions. It't pretty unusual that they obtain bad more than enough to cause issues, and you can tell effortlessly by simply re-writing the roller. If it can make a chattering audio or if the roller weighs up in one spot, they require to become replaced. In the beginning, I would attempt simply offering the rollers a good cleaning up with isopropyl alcoholic beverages. That's i9000 even more essential for the timér roller: if thát moves, the servo can get baffled about what the cassette is carrying out, with significantly bad outcomes.
I in no way did consult: does this machine work now? NECRAT wrote:Took our engineer about three weeks per device. We may have got delivered the 2ndeb machine's planks out to Spec Comm to perform the job. Well, that has me beat. At one point we purchased a used BVH-2500 (it's a BVH-2000 with a dynamic tracking component on the record head, so that it can report a solitary industry of video also when the recording isn'capital t moving).
This particular machine has been one of abóut a dozen thát were produced with an analog trace control system for the report head, which had been never awfully stable and required constant recalibration. Sony remodeled the thing almost immediately to use a electronic control program.
But we were stuck with the old analog version. If I keep in mind best, the machine has been serial quantity 10007 (the 7th a single built); I nevertheless possess the control screen: This had been the very very first one out the door. We used it for about a 12 months (it defeat doing computer animation by hrs of one-framé edits on thé 2000), but when we obtained computer equipment that could make full animations internally instead than recording a frame at a time to recorded argument, I tore the device down to the uncovered frame, repairing it as á BVH-2000 with a mix of planks and major elements from our oIdest 2000, with fresh heads, guides, and additional wear products. That was a enjoyment project (okay, I have a twisted concept of enjoyment), and required me about two days to complete. There's i9000 a component of me that feels bad now about getting demolished a classic 2500, but at the period we really needed a reliable machine, and we wéren't about tó spend another $75,000 for a new device. And didn't really desire to have got one BVH-3100 in a shop with three additional 2000s.
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The benefit will be, I have a great deal of spare components to keep our staying machines running! NECRAT wrote:But how frequently do you make use of it? We've longer since got rid of of all our 1' gear. We possess a few of Beta products, and probably 1 3/4' veranda around, gathering dirt. DVCPro is definitely even hardly touched anymore. It's not awfully regular that we need 1' presently, but we perform occasionally require to handle archived material. We nevertheless possess the capability to play 1', Beta, U-matic, and DVC-Pro; if I needed to, I could shoot up one óf the TP66s to move film fairly rapidly.
Our information department enjoys being capable to make use of old footage when it's related, and since we're also interconnected straight with five various other stations, we require to offer with articles from a great deal of various sources. Besides, we nevertheless have displays and movies under contract on 1' and 3/4' record (Small Home on the Prairie, anyone?).
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