Panasonic K-mechanism, NV-HS1000, NV-HS950, AG-4700. Rummage in a big box of video spares. Fail.
Вставка
- Опубліковано 22 лют 2020
- Working on the Panasonic K-mechanism with particular reference to models NV-HS1000, NV-HS950, AG-4700.
Can we fix this without part we need, and with a cold? Maybe not.
But we do get to rummage in a super box of video spares!
Audio and video transfers: www.video99.co.uk/
Please support us on Patreon / video99couk
or Paypal to colin@video99.co.uk
Music “Let It Run” with permission, copyright Cristie/MacFarlane. - Наука та технологія
The long awaited video, great work! :-)
If the mechanism is also completely jammed with a cassette loaded (or 900, 950), only loosen the 2 accessable screws in the back from the housing and wiggling it up until the metal gear gets free helps.
Alignment is done in cassette down position. Then you can easily check the marks.
you are pretty brilliant. Its sad that eventually there will be a time that VCRs will no longer have any technicians left to help fix them.
Thanks to your video, I was able to fix the error myself. My NV HS- 1000 Recorder had the same Error. Now it works perfectly again! :) Thank you very much and greetings from Germany!
I had a case of a stuck tape in the K mechanism. In my experience when I remove the screw from under the cassette basket (at the 6:36 timestamp), I never put it back. This is particularly useful when you work on NV-HS950. This unit has an inacessible loading motor assembly, so you cannot eject the tape manually when it is stuck. I ended up breaking the cassette basket because the screw was inaccessible, had to borrow another basket from a mono machine. In the case of the NV-HS1000, you can access the worm gear from the bottom of the unit just as you shown, which is kind of cool about this VCR.
Thanks a lot for this video! You helped me fix the loading motor connector. I have sandpapered the motor axis and glued the connector on it. Works !!!
In my particular non-ejecting scenario, I found a quicker way of getting the tape to eject - I removed the spring from the pinch roller mech (the one you found disconnected in another video about the K drive) and the loading worm drive had enough grip on the loading motor to remove the tape.
I suspect, among all the other mechanical resistance putting torque on that plastic coupling between the motor and the worm gear, that small but strong spring is just too tough for the coupling to survive indefinitely.
I enjoy every video you make, even if you don't get the result you wanted.
I've been there too.
My mum worked at g.e.c in coventy i think, and roughly around 1947 when she would have been 20, she hated wiring up the telephone switch panals, so many wires to solder and the wooden cases split far too easy.
She also worked at Alfred herberts (she loved that place) and "The hood and side screen."
The clutch i would wipe with metholated spirits and do radial 1200 grade sanding on the smooth plastic plate, then add more tension to the spring, or add washers to compress it.
That machine seems rather touchy, there is no forgiving of an imperfect drive :-(.
I was there with you looking in that box, back to the past i went mentally, videos were fun to repair :-D.
The Tip41a was my favorite transistor for any power regulator, well over board and never failed again lol.
GEC were once a huge company. At one point an uncle and myself both ended up working for different parts of the same business, and doing the same job, even though we had never met. But years earlier when I was a kid, he would leave boxes of electronic goodies at my grandmother's house for me to play with. My granny called them "silicon chippings" which was close enough. He helped inspire me in electronics. The factory I used to work at is still there: Plessey Semiconductors, Plymouth.
Your uncle gave you a great start to electronics, i like the "silicon chippings" :-D
Granny was a smart woman by the sounds of it.
I learnt by taking things apart, school was very confusing for me.
They would call me "Thick", they didn't understand that not everyone learnt the same way.
Yep Plessey, i've seen that name on a lot of parts, another good company.
Thanks was able to unfreeze the mechanism by turning the motor underneath and capture 38 year old footage thanks to you
I've chewed my way through plenty of these AGs and have been my favourite machine for a while, but the mechanism for FF / REW is always the first thing to go.
Good job sir
good job sir
I have a set of those VCR Alignment Tools - especially like the reversible screwdrivers! Couldn't find much in my notes for K-Mech, although this lot might come in handy:
Playback slow; damages tape; reel brake not releasing - Brake release mech broken pt no VX20313.
Brakes stay on in play - Little plastic tab broken off brake ass'y.
Slack tape on eject - Centre clutch ass'y VXP1409 weak.
It's that clutch VXP1409 that's causing the trouble here. I've never used the screwdrivers from my VCR kits, I should give them a go.
Thank you for this video, I have just rescued a tape out of my dead HFS-1000.
Any chance of you doing a video about repairing power supplies for Panasonic NV-F70s? 😊
At 15:40 this is not a cassette-in switch. It is a S-VHS switch. Ordinary VCR's with the K-mech do not have anything there (for example NV-SD3, NV-HD90).
Thanks for the video , great job ! My Panasonic 950 has a problem with the tape receiver. Now I understand what to do , thanks ! In addition to this - uneven glow of the indicators of the level of the audio signal . Could you tell me what can be done ?
VU meter brightness: First check that it looks the same with the front removed. Contamination on the plastic cover can cause this. Otherwise, it's likely to be VFD poisoning and there's not much that can be done other than try to find a good used replacement.
Mine doesnt take the casett in, stops before lowering the casett. I will try to disassembly based on your guide videos and check what can cause this.
back again, just took mine apart for a clean and a grease, however, it turns out I've put it back together and it's been running fine despite later discovering that plastic springy plunger next to the worm drive had fallen out, any idea what it's for?
Doesn't seem to have affected playback or other transport at all!
Not quite sure from that description. It's worth checking against the service manual, which is not hard to find and download free.
Hello colin, could you tell me what is the main cause for colour banding on beta vcr's...Mainly sony.
Hi,
Great video. Information about how to remove the loading motor where very clear.
I wonder if you could give me a hint what to do next. I have an HS1000 which cannot fully lace. The P2 and P3 arms go 3/4 of the path length then the tape is ejected. There is no error message on the display.
I changed the coupling inside the worm drive following your instructions with a new one.
But the problem still persists.
Can I try to diagnose something through service menu? Is there such thing?
Thank you in advance.
UPDATE: The P2 and P3 won’t go to the end of the path because the pinch arm was stuck on the shaft. The old grease was hard.
I removed the pinch arm and greased the shaft. After that the P2 and P3 arms starts to work almost OK and the lacing was complete.
I believe I have to re-grease all the unit because the image is jerky (hope I said OK) and the lacing is slower at the end.
I saw this problem on a lot of units on UA-cam and on a lot of different forums.
great video, thank you! maybe you can help me? I have a panasonic nv-hs950, it loads the cassette, with the tape fully onto the head but then after a few seconds it unloads it and pushes the cassette out before I can push any play button.... no error codes... :((((
There are lots of possibilities. Make sure that no debris like a sticky label has got into the machine. It could be due to the mode switch which isn't that easy to fix unless you know what you are doing.
That 's a great repair , congrats ! I have a K mechanic Panasonic with some trouble in a panasonic NV 660 when I get in the service mode via eject /fast forward it is apperently indicating giving NO fault on the display , I can load the tape and unload in that nr 7 service mode , so I suppose the modeswitch is correct set , I tried a tooth forward and one backwards and it gave a fault 04 indicating mis-aligning the mode switch . now for one very strange reason when I switch of electric of the unit I still can not have it loading a tape when switching on .. so I am stuck with this one ,, is there any pôssibility there should be a memory backup battery or special memory capacitor ? could that cause the problem ?? by the way the way to get a tape out that's stuck halfway via the bottom , and turning by hand the load motor , is impossible with the 660 because it is fully plastic box closed on the bottom !! so it is a pain in the ass then to get the tape out ; been there . can you give me a hint about this 'as dead' not willing to load or play recorder ?? the load motor had a small plastic part that was split and I glued that back on with instant glue , it works so far .
There is no memory, that's not the problem. But I can't really diagnose a deck from a distance, and I'm not really a K-mech expert.
@@video99couk my 660 is the same as the first plastic box you openend in de beginning , if you want that complete K mech you can get it , I think the clutch you are seeking is in there and mine is nearly new , just that rotten fault in it , I am not bothering after one day fidling in out in out playing with that mode switch and the service mode , I guess the fault is in the processor , this recorder as seen practically very litle use it looks like new inside , but must have been put away after the fault and nobody wanted to fix it , or could find the real fault in it . so if you wanna have that mechanic or the compete video ?. give me a sign on my facebook Benji Massy , or a PM on that Fb messenger , I can send you the lot if you pay the postage from Belgium ; Cheers , Benji
Hello mate! Got myself an AG-4700 today, but one of my tapes got stuck as soon as I tried to get it out after testing. Any tips on what I should do?
Sounds like the loading motor coupling has split, as explained in this video. You will have a bit of fun getting the tape out, maybe gently help the deck to unlace. Then dismantle and perhaps glue the motor coupling.
I have this same problem on my Panasonic NV-HD600EE
I have an ag 4700 to which I remove the front panel as you do in minute 9.20. remove to clean inside and assemble carefully. I was able to get the cassette deck to work with the remote control and everything works fine, but when I reinstall the front panel the commands work incorrectly. I want to put stop and it goes to play. I want to fast forward and pause etc etc. Is there a reset that I should do? what will be the problem ?? '. Thank you
You may have either misaligned or damaged the connector from the front panel to the machine. You should take off the front panel and look carefully at the connector.
Good Day sir. Nice. Thank you for The help provider it in this video. Please tell ME, is a Panasonic nv hd 620 video head The same with The normal HS 1000?? I WANT TO CHANGE IT
You would have to check the part numbers, which are usually printed on the head drums, but probably not the same.
As far as I can see here is the same ua-cam.com/video/GYDJLMU1q3Q/v-deo.html&feature=share
My NV-SD35 (K-Mechanism) decided to display an "8" while rewinding a tape. The tape was rewinded but heard motors still going. Buttons didnt respond so pulled the powerplug on it, and plugged it back in. Now it turns on, starts spinning up, but after about 5 seconds it just turns completely off again. I can unplug and plug it back in, and it will do the same. but does not react to button presses. Any ideas?
Very hard to debug remotely. Main suspects would be a CPU error perhaps due to bad capacitors in power supply or elsewhere, or maybe the mode switch needs cleaning. It may not be trivial to repair and will need the service manual and some serious attention.
Hi, I am sourcing for some parts for my Panasonic vcr can help
i have a NV-HS1000 and it has the same exact set of problems, hard to rewind and slow at fast forward, it gives up, tape slacking, but the loading and ejecting are fine... i watched almost all of your video, did you happen to succeed at finding what's the problem? is it really the clutch? (i don't think so honestly)
Clutch wear can cause it not to go into FF/REW modes. But being slow may be a different problem, or it may be excessive friction in the clutch. The difficulty with these decks is it's very hard to watch the mechanism when connected to the deck, so you may have to use the loading motor to get into the FF mode and then turn the capstan motor by hand and look at why it is struggling. To do this, you will have to take the deck out.
@@video99couk sorry if i'm making you waste time, i know i'm not paying you... it MAY be excessive clutch friction, it plays well but sometimes it chews the tape on the upper edge when fast rewinding (or trying to), and it gives up and retries with the pinch roller engaged (winding slow but winding), but i noticed something, if i press the brake arms (the tesioners, one with the lasso brake on the left and the one with a brake pad on the right, the ones that that adjust the braking automatically with tape tension) it rewinds and FF perfectly and fast, but i have to keep em pressed with a stick, and i also noticed that when it slows down gradually sometimes (cos it's faulty) also the capstan slows down (it remained a bit dirty and i see the dirt spinning slower), so it MAY be the clutch too tight... but before i make it into pieces i'd really care for an opinion
EDIT::: i believe i fixed it or at least it's almost perfect now, the problem was apparently the height of the tape, there are the two white rollers that put the tape around the drum head, and i unscrewed those rollers a bit and it stopped wrinkling the tape in rewind and it seems more free now, it looked like a friction around the drum head, i had a bit of troubles with the audio head cos it needed a bit re-adjustment but it seems pretty ok now
If the coupling on the loading motor fails can the deck emit a screeching sound? I have this on mine, the tape laces but the pinch roller doesn't descend and push against the capstan. When trying to eject the deck screeches. Also, have you seen any error codes the service information mode associated with this problem? Thanks.
Yes they can make a noise as the pulley slips on the motor shaft. But it's possible your deck has a different fault, it's impossible to say without inspecting it. If the deck can't complete some part of the load/unload cycle, it may produce an E code on the display, exactly which one may depend on various factors such as where it got to.
@@video99couk thanks for replying. MY deck just goes back into standby mode when it decides it can't fully load/unload and if you power it up the same thing happens again. Interestingly the service information mode suggests if I understand it correctly problems with the Cylinder!/capstan but I wonder if that just might be because the deck is not doing what the controller expects. I am going to take the loading motor out and and have a look at it just to see.
@@video99couk having removed the loading motor and turning the cog by hand resistance does increase dramatically as the pinch roller tries to descend to engage with capstan. It looks like the mechanism is definitely straining so I think I'm going to have to dismantle the entire machanism and properly learn how it works.
Hey i i have Panasonic Vcr 225 i buy it from cheap when i reach home i check it load tap then eject and showing error code f06 then i planning to cleaning it deep cleaning macanism i did all things now i reassembl but still facing same problem tape insert then eject with some seconds i check capsitor with multimeter in beeping way the one capsitor beeping in multimeter i thought its short then i replace it with new sam value then i check again its still showing beep shound why? How to get ride of it any solution please its very helpful thanks love ur videos
Sorry, I can't fix machines by remote control. It needs to be worked on my someone who knows what they are doing.
Já tive um no meu museu mas há 6 anos atrás uma peça mecânica partiu e acabei com ele na sucata.
I hope you did not throw it away, you may be able to get the part one day. I still hope to get a good clutch for the AG-4700.
@@video99couk o meu era igual AG-4700,partiu esse guia de funções e tentei colar mas partia novamente. Tenho a cabeça de video guardada.
@@MyPOLYSTAR It might have had a good clutch in it!
What actually was the difference between the NV and AG versions? Apart from the colour of the outer casing, of course!
I've often wondered about that myself. The AG version has a simpler remote control. But is there a difference in the machines themselves? Well it's only an impression I get, which might be due to chance, but I think there is less video noise from the AG version. At one point I thought that the AG version lacked the head cleaner since I have three AG-4700 machines which lack a head cleaner, but then I got one which does include it. There is something I found in the manuals though: VITC Editing (frame accurate editing) is an optional upgrade on the NV but is installed as standard in the AG model.
@@video99couk That's interesting to know. East Devon College had loads of these dotted about in the mid-90s - some the AG and some the NV version, but I never managed to work out what the difference was.
@@joenest2122 I have a feeling that one of my machines may have started life there.
@@video99couk Be great if it is - good to know that EDC lives on! Love your videos (not that I really understand a lot of what you're doing), so thanks for all the effort you put into them.
have you made a video yet to completely tear down a K-mechanism transport, and re-assemble it ? that would be very useful for many viewers, it seems that the phasing is a big problem with these units
I'm not sure I'm an expert on that. I've managed to re-time some of the gears on occasion but not recently.
@@video99couk i think i have my timing okay now, aligning all the dots and arrows , the vhs tape will play, but only if i push down on the tape as it loads , once ive given a single push, the tape plays normally, so i think that must be an alignment of the cassette loader itself, not the phasing of the base, that seems to be dialled in, have you ever had this problem? and what fixed it on a second note, are there any non commercial K-mechanisms i can purchase, (if so give me a list if you know) to just make use of their mechanical parts and pieces? rather then buying an AG-1980 just for the cassette loader?
@@davidf7587 New video on this very subject, due out on Friday.
Sir I have Panasonic g500 vcr play very fine but after time count on display stop but Play continue picture start snowing audio become heavy
You are losing sync pulses, either due to damaged tape, worn or misaligned audio/control head, or some electronic fault in the servo circuits.
GEC/Hitachi connection,CED player :)
Oh yes, there's one, via GEC McMichael.
CHS .... Charles Hyde Spares, I remember them well ! Shame they disappeared. S.E.M.E were great too, (Small Elephant Medium Elephant) I wonder what the history of the name was !
SEME: Was the merger of two small companies, names like South Eastern Electronics and Midland Electronics or similar. Went to register new name, something like South Eastern and Midland Electronics, but were told it was too similar to another company name. The initials were OK, so long as they didn't stand for those words. So thinking fast, they decided their new title was Small Elephant, Medium Elephant, problem solved.
always remove head cleaning system, it gets dry and hard and could destroy vheads.
I've never known head cleaner systems damage heads, I wonder if that's even possible. But if the cleaner gets flattened on one side so that it doesn't spin, I agree that it doesn't help to clean the heads at that point. Head cleaners are also built into professional equipment including HDCAM which cost huge money.
@@video99couk I bought the NV-HS1000 a long time ago, and only after a few years of active use, its heads started to get dirty. The problem was indeed the integrated head cleaner which had gone dirty and hard, and basically after manually cleaning the heads, it put the dirt back in the heads. It doing its job was a terrible sight, I was also afraid that it will physically damage the heads.
I solved the problem by removing the cleaning cushion of the cleaner so that it never touches the heads again. After this, the machine worked fine for a long time.
Now later when I tried the machine again to transfer some tapes, it gives a couple of moving distortion bars even in test picture mode, along with not playing tapes anymore without terrible picture quality, so I am now trying to figure out what is causing these issues to get it working again.
Otherwise a great machine, I've always loved it.
Hello.
Hope You will help me...
On 16:53 we can see plastic part on the rotor unit (if I understand correct - VXA5138 (SS brake base unit). And when I press PLAY in my Ag-4700 this part started rub about rotor surface. As result video and sound plays with yank. Add a link on video: ua-cam.com/video/Cf6RADQL7Qg/v-deo.html
May be You know the reason and possible way to solve the problem ...
Than You
That is the capstan motor brake. I can't see why it is engaging when it shouldn't be. You need to take the deck out to see what it activating it when it should not be doing so. Trouble is you can't do much with the deck out of the machine, that's a bit of a failing of this sort of design. You could get brutal and cut away the plastic which covers part of the deck so you can see its operation better when it's in place. So alas I don't have an immediate suggestion for a fix, you will have to examine it in more detail.
Can you provide me
These parts
vdg 0866
Vem 0427
vdg 0913
Vdv 0235
I don't stock any parts. Sometimes a scrap machine with the same mechanism is the best bet. There are a few suppliers such as www.donberg.ie but they can be very expensive.
great video, thank you! maybe you can help me? I have a panasonic nv-hs950, it loads the cassette, with the tape fully onto the head but then after a few seconds it unloads it and pushes the cassette out before I can push any play button.... no error codes... :((((
I have that sometimes with those 240 minutes cassettes when they are at the very beginning of the tape , when you do some fast forward it keeps working satisfactory ..