That was the point. Proving the problem was on the hybrid module. I paid nothing for it, and I will probably get 20 bucks for it as it sits plus whatever the video makes but it will certainly give valuable information for someone with one of these that actually wants to repair the board.
Last 12 months I have had several jobs capturing old family VHS videos for friends. Luckily I had kept 3 recorders, a Panasonic, and two Samsungs. That's probably another reason why people are looking for VHS machines as well as Video8 and DV cameras. I just finished capturing, editing and converting 18 X 90 minute Video8 tapes, all fully recorded. I did not have a Video8 camera and managed to find two Sony camcorders after asking around. The first had a good picture on the viewfinder, but distorted video and audio from the composite/mono outputs. The second, I was assured, was in working order, also composite/mono sound configuration, but as it was being retrieved from a high shelf, it was DROPPED. Will not power on. Finally, I tried a long time friend who told me he had a Sony camcorder that worked last time he tried it, ten years ago, and said I was welcome to take it. Upon retrieval it turned out to be a versatile self-sensing analogue OR digital machine, with stereo audio out AND svideo output as well as the digital output. I hooked it up to my Blackmagic Design capture card using the svideo/analogue audio outputs and it worked beautifully! My friend said it had only ever had two tapes run through it. Job done!
I've been watching my decades old VHS tapes the past couple years. Love to watch the old shows and movies I recorded when I was younger. Watching the "Babylon 5" series lately. I bought a JVC SVHS HiFi machine last year on eBay cheap with a dirty mode switch. Been working great since I cleaned it up.
Those thick-film units were always trouble. The caps used in there look identical to the ones used in the Sega Game Gear, also from around the same era. They are almost always 100% toast! You then end up with a console that behaves in a similar fashion to those Casio LCD pocket TV's you fixed previously! Gotta love nineties tech!
Thank you very much for this. I have a Magnavox VR2072 with a similar mechanism. It was a top end deck in 1988 (but is a step down from the SVHS machines). I actually like to dub my own tapes. One thing that I try to do is make tapes that feel like you are sitting in a theater in the 1930s (my grandfather was a projectionist). I compile a number of movies from the same era (for instance, I put together a tape of depression era westerns and fill it with cartoons from that same time). The Sharp VC-6846U is a great mono unit that has the sound that would make say, a digital remaster of an old movie actually sound like I am watching the movie through an analog projector. DVD issues to my ears use aggressive noise reduction when I know that analog projectors would have a more "compressed" sound like older radios. The aforementioned Sharp does a good job at replicating that "tube sound" in my opinion.
I have watched you fix some of your betamax and vhs machines and now this one. You are an amazing technician at that and how fast you can find the problems and fix them. Cheers Mate.
They are not as good as r2r. All hifi video sound is companded. Very similar to dbx, but not exactly the same so they didn't have to license it. You can hear it working if you listen closely. A warbling sound.
You Did A Good Job On That VCR. A Lot Of People Wouldn't Think To Check The Modual. That's Why I'm Waiting To Get A Hot Air Station So I Can Fix That Portable CD Player With A Bad processor Chip.
I remember back in the day when people used to pay $100 plus to have heads replaced in their VCRs especially if it was a 4-Head or 6-Head HI-FI machine as they used to cost hundreds of dollars to buy new.
You did put way much work i would had for something that would end up being sold for 20$.... and since the hi-fi isn't still working properley, I don't know if you did, but i would had advertised it as a non-hi-fi machine. Nevertheless, I love watching your videos, I'm myself fixing a lot of those old beta and vhs machines so, every knowledge share is great! I guess I should mount a cam over my bench and make some french live videos as I fix some stuff as well. Cheers!
I found A Fisher VCR that as both linear stereo head & plays stereo & Hi-Fi tapes as some older decks only had stereo tapes before HiFi. If u recorded in HiFi it will play HiFi but if you have a VCR with no HiFi but plays stereo then it will play linear stereo. Never seen this but usually Hi-Fi VCR's will record mono linear. Recorded HiFi movies & music tapes are linear mono not stereo.
Don't get me started on modern tv or movies. They used to leave it to your imagination but lately it seems that stuff that belongs behind closed doors needs to be in your face. Even the advertising now is full of it. Pretty much every commercial, tv show and movie is "woke"
PV7541… the drum on mine ticks pretty loud. I think it’s a soldered board on the bottom of the drum, slightly raising the chip makes the sound go away. But all the mechanisms seem great otherwise
I have a Panasonic VHS VCR it states it can record in Stereo Hifi, when i dubbed a tape which has Stereo, the copied tape plays in Mono. What could be the issue.
I have only very slight audio on a fb75 can just hear it if headphones are plugged in and what there is is very distorted and not any audio on line outs ,it has a great picture though ,I have new genuine panasonic heads for my 1985 NV-730 this machine is fine at the moment though.
Love watching old equipment return to operation under your skill. I have drawers full of vcr tapes. Would you mind recommending a old vcr for playing them, hi fi stereo. Thank you, Robert
@@12voltvids many of these Panasonic vcrs from the early 90s would sometimes have a weak power supply. I saw an rca panasonic vr323 but it was a 4 head HI-FI deck rather than 4 head mono or 2 head. You would hear sparks or electric sounds coming from the power supply and sometimes when going in to play it would shut off.
I have a Mickey mouse 8mm movie film were Mickey mouse puts on blackface by putting a firecracker in his mouth and lighting it! It was from 1932. Back in the 60s they sold shorts on silent 8mm for movie night at home.
I have a Toshiba VCR that works great, but for some reason won't detect the hifi. I know it's not the tapes bc I also have another similar Toshiba that does. The picture and sound in general is good, but the hifi won't work at all. I tried cleaning the heads and messing the azimuth slightly but still nothing
There are many reasons why HiFi audio won't work. The process of recording HiFi is much more involved then linear audio. For starters the audio is modulated onto 2 carriers. These signals are then recorded at a high level into the tape in what is called deep layer recording as very different azimuth angles. +-30'. The video is then recorded overtop of the audio at -+6'. This gives a 36' azimuth shift between the deep layer and surface recording of the video which incidentally when it plows over the audio that was previously recorded it erases about 60% of the signal. There is enough left however that with the steep angle difference the audio heads can pick up the weak signal that remains and amplify the crap our of it, then filter it to get rid of video and chroma that will be present and finally demodulate the signal. As I said lots going on. No audio could be worn heads or a failure of circuitry in the demod circuit. This is one of the things that was superrior with beta, and 8mm for that matter. The audio was recorded between the lower sideband of the lumanence signal and the down converted color. These formats could do it because there was bandwidth available. VHS on the other hand with it's lower bandwidth had to find another way to do it. 2 more heads and a ton of processing. All that extra crap means the HiFi signal is fragile and if anything is a little off, alignment head wear cap leakage ecy the result is muted HiFi and the linear track is selected.
@@12voltvids gotcha and yeah I know it's definitely an issue with the VCR bc I have 2. They're both toshibas and very similar to each other. The one is just a slightly more higher end model and sadly that's the one with the issue. It plays tapes perfectly and has both picture and audio, but the audio is just limited to the linear track. It doesn't switch to hifi no matter what I do, but the sound it has is clear with no dropouts or anything. The other VCR detects the hifi immediately and the picture quality between the 2 is nearly identical too.
Used, as it is old the caps are likely bad and shipping from USA will mean minimum 40 broker and shipping fee. So now we are at 77 for a VCR that is worth perhaps 20.
34:23 "OK let's find out wether it works in stereo" *starts playing the tape and immediately the guy doing the commentary on the BOSE demo tape says "IN STEREO"* LMAO...
@@12voltvids im glad you got the hifi to come in despite the slight noise in the sound still. Im sure the PUA3228 Cap drive ic2 is good. Hopefully it wont go bad anytime soon.
What do you think it causes high frequency noise in linear audio in JVC VCR's? I've sent you an e-mail about this VCR problem with audio samples, If you get chance check it out if you are busy don't worry about it. You may actually end up fixing it.
Oh wow! This is what I was looking for. I have similar model with busted PSU. Zenner on secondary side is shorted, is there any possibility to figure out what Zenner voltage is it ? Or at least measure output voltages of PSU for this machine ? Or may be you have service manual for this guy ? Thank you
I do have the schematics for this model (power supply part number VJBS01017/VEPS01017). The voltages should be: Unswitched +44V Unswitched +14V Unswitched -30V Unswitched +5V for the system control circuit Unswitched +5V for the video circuit Power down (L) Ground F+ (Filament heater voltage for the display) F- (Filament heater voltage for the display) D1011 in the 5V rail is a 5.1V (MA4051NH) zener and D1015 in the 14V rail is an 18V (MA2180 or RD18FB) zener. PR1001 is an ICP-F38 circuit protector fuse which can blow if there's overvoltage or short in the 5V rail.
@@crashbandicoot4everr Awesome ! Thank you for the reply! I have found some old stock ECG5077A for cheap, which is 18V zenner as well. But could not found some time to fix it ! My module is VEPS01017 as well BTW. If it is possible can you please share the schematic with me? ( My contact info is here -> ru-vid.comabout ) Thank you
@@InsideOutElectronics I did post the link for the schematics here but youtube likes to delete comments containing links. I sent them via wetransfer now so you should have them in your inbox. :)
hey 12voltvids, I have a Panasonic NV FS 90, with a little problem! the screen and clock does no longer display!! but the video works fine still has a picture, it ff,rw ejects plays ok still! any ideas or anyone know what part i can change? I have 5 for spares with other problems and the screens work on them just no video output. I have 3 power supplies and tested and they all do the same thing, no screen. yup all the screen work on the other machines but have no out put picture.
Swap the VEP07622C timer board from a machine that has a working display. That should fix it if the problem is on the board and not a missing voltage from elsewhere.
@@crashbandicoot4everr hi thanks for the reply, I did that as i have 4 of them and are all doing the same thing, new caps on the power supply i thought might have been the problem. I changed the mainboard now and now have the clock back with the display, but now no video output using all the working parts from the main machine that was all working! its a 2 steps forward then 1 back again. lol
@@12voltvids It's definitely not the lead vapors ;) But IIRC I've read something about occupational asthma being higher. Just try to solder for a few hours and if your room is kinda closed you'll notice it. So if you do it for years it might have an effect ...
@@machannel8746 Well I did it for 20 years and the shop had no ventilation. In fact the boss would close the door to the shop to stop customers from just walking in and "wasting my time talking to me". The stink from cleaners was almost unbearable. Occupational Hazzard i would say. I'm no worse for wear. In my shop i have good ventilation as i can just open the big door and it will air out quickly and open the side door to get good air flow. Naturally when it is freezing I don't but I am not using many chemicals these days and I don't produce alot of smoke soldering. Nothing compared to what people that smoke or toke do to their lungs. Tobacco and marijuana smoke has far more carcinogenic chemicals than rosin smoke and people intentionally suck it deeply into their lungs and hold their breath for maximum damage. I don't intentionally inhale smoke. I actually avoid it.
I got a old VCR so I could play my tapes for my kids like the Natural Born Killers movie my friends and I spliced crime scene photos & Marilyn Manson, Tool, Nine Inch Nails, and My Life With the Thrill Kill Kult songs into. The modern version of Natural Born Killers was ruined by editing it to be politically correct.
Sony were ok. They had issues. Capstan motor bearing, seized up p6 guide, blue threading gear, power supply leaky caps. Other than that they were good solid performers.
On PCBs you can, but the delicate pads cleaning process can be very time consuming. Depending of the corrosion state you have to scrape, rub with white vinegar/IPA, sometimes redo the pad with copper foil or redo the track or via with a thin enamelled wire, etc. For modules, if it remains simple (for example only few caps/resistors), it could be possible to recreate the module. In this case, we have the luck that resin don't cover it entirely so we can measure the painted resistors, it may be possible to design a PCB as a replacement, reusing the custom IC of course. Some arcade game boards can revive with this kind of recreated modules. So, there are solutions, but it highly depends of what you want to do, considering the required time and soldering/designing level.
what if the hifi stereo is intermittent? could be dirty heads? but the picture is fine. it depends on the tape, some tapes play with the hifi always on
The way VHS HiFi what's recorded I'm surprised it even plays back at all. Beatrice Hi-Fi uses what they called deep layer recording where the signal is recorded deep into the tape and then the video is laid down on top of it at a different angle. the overlay video signal erases approximately 70% of the audio signal that was previously recorded just before the video signal was laid down over top of it. On playback the only reason you can even detect the audio FM signals that have been over recorded by the FM lumanence signal and the double side band audio signals is due to the 36' azimuth shift between the heads and the narrow band of the audio signals with respect to the video. First two heads have to actually detect the signal and then the singles need to be filtered out from all the noise. as tapes age the weaker audio signals 10 to get lost in the mud just due to self eraser that coupled with the fact that the heads we're down on your playback machine making the recovery impossible. I have multiple VHS machines here that I use for archiving and I would estimate that 1 in 10 tapes I have to switch to mono to get clean sound as the tape has deteriorated and Hi-Fi recovery is not possible. when a customer complains about this site just say too bad so sad you waited too long your tape is shot you're lucky to get anything off of it.
