Excellent repair! I have repaired Salora-brand vcr with help of your vids. There was dirty decoder switch, witch i cleaned with contact cleaner. My humble thanks for vid.👍
Wow, I was impressed on how quickly you zeroed in on those two faulty components. I was working on a similar 4734S that took me about 45 minutes to find just the bad 20V zener. After replacing it, I had the same issue with partial power to the board. I was about to give up until I saw this video. Yup, same open protection diode in exactly the same place. I used your fix with a piece of magnet wire (sanded clean) soldered as a jumper. The power was restored to the entire board, but the vhs tape would only partially load by lowering the tape but not pulling the tape out. The head would spin, then eject. I checked the entire vhs assembly for binding. I tried manually moving the mechanism, but nothing would move after the tape was lowered. I did move the mode switch around without disassembly. After I reinstalled the vhs drive, it worked perfectly. I have never seen these these "protection diodes" before. Is it fair to say they can be safely jumpered? It seems more like a built in stroke waiting to happen. Thank you for your work. You have another device up and running.
KUDO's Dave. I recently had a buddy bring me 2 Cobra walk-talk which had issues. I opened both and found cracked solder joints. Fixed both, but....I used my ULTRA CLASSIC Harley 's CB radio to test them.....and absent-mindedly left the scoot ON IN AUXILIARY MODE. AGM battery dropped to 4 volts. I put it on a "smart charger" and the voltage came back but the electronic ignition / fuel injection system light did not activate. I scratched my head, found a vid and pulled the fuses behind the side panel. The fuses were good and the system RE-SET itself. I am back to riding in the excellent Texas weather. Thanks for sending us some Canadian cool air. JwgK
No dropouts on the tape playback, eather the headchips are new or the drop out compensation is really good. I could hear you mentally giving up on it early on (i'm not attacking you dave), and i do understand as i've done the same. Having no interest in fixing crap makes giving up a good option. Being in the right mood makes a hell of a difference, you have had epic death repairs that i would have run away from, but you didn't.
It was all an act. Looking at that head i didn't know what shape that was in. The big clue was component output working forb dvd player but no composite output. Initially the power would turn on when the tape mechanism activated but no load so I thought initially a problem with load motor drive, but when no video it became aparant that there was a missing voltage.
An Incredible repair as always your work is appreciated very much with those of us who have and prefer vhs 📼 thank you for sharing your great talent in producing these films 🎥 ✨️✨️✨️✨️✨️✔️🎬
Great fix, Dave . I have one of these units I purchased new and it always runs flawlessly. Hope I didn't jinks it........ I'm trying to fix a pioneer dvd player that has a stuck closed draw. The belt seem fine, and it seems the optical sled won't lower to release the draw. Is there a slide or something keeping it locked? Any suggestions appreciated. Thanks again for a great troubleshooting tutorial. John
Had a feeling it might be a circuit protector. Seen them fail at random in JVC equipment - the ones that look like two-legged transistors. Philips preferred using those round 'Wickmann/ Littelfuse' type that had a tendency to disintegrate and go o/c.
My electronic teacher/mentor since I never had any OFFICIAL schooling always taught his "KID's" how to make new fuses from old fuses, back in the 70's the ends of glass type fuses had solder on the ends.....One strand of small speaker wire was equal to a 3 amp fuse , he would say.... and dang close to it also, your strand of wire reminded me of that , WOW the good ole day's of electronics, now we have SMD's . VIA's , 2 sided PCB's, no lead solder , I'll take the 70's and 80's and the early 90's any day....
Hi 12voltvids, well don't feel alone repairing this newfangled crap of putting all on one board, it's like the new TV's, I hate them as they are just cheap crap, give me a old plasma any day, why on earth would anyone make them like this, I find your videos just amazing as you do not be ling finding the problem's, man you are the best, that's why I love watching your videos they are great. 😀👍
I have a DMR48EZV by Panasonic manufactured back in 2008 - Its a multi DVD format recorder with a VCR and as well Usb and SD Card reader.. . I purchased it from London drugs in Gibson's back in 2010 and that was the last unit they had on hand at a discount, as they were not getting any more. If that helps of the time line - of to when Panasonic stopped production. cause if memory serves I never saw any more VCR's after that - DVD recorder yes but even those are totally gone now and you won't find them in the stores any more. Toshiba was the very last company to sell off there stock. Now - no more to be found unless used.
Years ago I bought a duplicate used vcr of the one I have and put it aside and kept it for the day I might need parts. It sat like that for over 10 years. The other day I turned on my vcr and no power. Retrieved the spare vcr and took its power board and swapped it into mine. Had a issue with the eject flap but nothing was broken there just the lever was out of place after I had the machine apart. Anyway I strongly suggest if you have a favorite vcr try hard to find a spare parts unit and keep it.
SO - Dave you indicated something about a IC circuit protector - but it was hard seeing what you were referring to. Could you do a more detailed video what these thingamagigs look like. for what I saw was what looked like a transistor that you had bridged, is that right??
May the good Lord bless you richly for making all of your videos. You have a lot more success, by far, than I have with repairing electronics. Frank Frank Reiser Video/Audio Service
Well I have success because I did this for a living for over 20 years so you tend to get good when that's all you do. I do have an extensive background of training in the field though it's not all self-taught some of it is but I took countless courses when I was in the business put on by the manufacturers that took me into their training program to train me on their products.
@@12voltvids I have this exact same unit. It originally belonged to my grandparents who only used it a couple times, but they let me have it. And it worked flawlessly since I got it. However last night, my neighborhood had a power outage in the middle of the night, and because of that, my unit is now an electronic corpse. Is that fixable?
@@supermariof0521 check the power supply. Could be dry caps or the switching ic. That part failed on mine. Was a 4.00 part with 5.00 shipping from kpcomponents. Even though they are only a 20 minute drive they only sell by mail :(
i have a sony unit with the same fast acting micro fuse problem, may I ask you what type of wire or filament you used? Once, I 'd used a super thin wire from a recycled crt relay to fix a blown speaker, the one that runs down to the coil, covered behind the black globs of glue 😢
I've got a panasonic multi combo dvd/vhs recorder. Over 15 years old and still works great,,,only the 4 head vhs video recorder drum is a bit worn out with the video heads,,,as it has been heavily used for copying tapes to dvd recordable discs. But vhs still records from recorded disc and plays ok too.
Thank you, as always, for your informative videos. Should one run the scope through the isolation transformer as well under the circumstances you demonstrated in this video, or does it matter?
My scope already has the ground prong removed so it is already floating. It doesn't hurt to power your scope through your isolation transformer, but is not necessary if the device under test is isolated.
I HAVE A PANASONIC DMR BWT 800 RECORDER IT STARTED LOOSING PICTURE AND MAKING LOUD SCRATCHY TYPE NOISES WITH THE SCREEN ON THE TV LOOKING LIKE IT IS OUT OF TUNE LOTS OF DOTS AND NOISY . I TUNED IT OFF LEFT IT FOR A WHILE IT THEN STARTED WORKING CORRECTLY FOR A DAY THEN STARTED THE SAME STUFF ALL OVER AGAIN ..NOW ALL I GET IS A BLANK SCREEN WITH THE WORDS NO SIGNAL !!1 I TRIED IT ON ANOTHER TV WITH DIFFERENT HDMI CABLES ETC TO MAKE SURE IT WAS THE PLAYER WITH SAME RESULTS ... NO SIGNAL .. THERE IS NO OBVIOUS BURNT CAPS ON THE BOARD THAT I CAN SEE ... THERE IS ONLY ONE HDMI PORT COMING OUT OF THE RECORDER SO CAN'T TRY A DIFFERENT PORT WHAT DO YOU SUGGEST ! PLEASE
Hello there i have one jus like this = panasonic im turns on vcr turns on takes the tape and turns off i would like you to fix it if you would please very good explanation in detail as to wats going om with the , machine how do we reach each other ? let me know dvd works
What was the component you shorted in ckt. This same problem (SMPS) was happened to my Panasonic VCR. I couldnt find fault is there any chance capacitors would have gone.
The first part that shorted was a zener diode. It is there to protect against over voltage by commuting suicide (shorting to ground ) if the voltage goes over the rating of the zener. The second part was an IC protector, a fuse. Replaced the zener and the power supply came back, but 1 voltage that operated the VCR portion was out due to the popped protector.
@@sivajisivaram2013 No bad esr will cause low voltages, or excessive ripple in the DC at the switching frequency. This results is herringbone interference in the video.
No I used what I had on hand. It's 2 volts higher, which is fine. The only reason it is there is to prevent damage in the event of a power supply failure and over voltage. Earlier machines had no protection and a power supply failure where 60 ot 70 volts comes down the B+ line does plenty of damage.
One-board-designs aren't that bad, at least not as bad as 10 different PCB's stuffed into one case and screwed together with 50 different screws and 30 different cables and board-to-board connectors, many Phillips are such a pita..
Got a NV-FJ730 and a NW-SV121 - will have to do the same... replace capacitors, diodes etc. The 121 is dead, the 730 shows a noise on the lower part of the picture (tape path is ok, all clean) Hope I get all together after the service Was so easy with the NV-F70 etc. Remove the PSU, service it, put it back - or just buy F70ties only and just swap the PSU
I think Panasonic stopped offering these units for sale in the US around 2010-2012. I have one and still use it. In working condition these bring a fair amount of money on eBay. Many people have there family events recorded on VHS and have realized that VHS is not archival. It costs a lot of money to send the tapes out to have the videos digitized. If you have a unit like this and a lot of tapes to convert this is a real money saver.
I have this exact same unit. And last night it worked perfectly. But because the electricity in my area sucks, we had our monthly power outage, and this unit didn't make it out alive. It won't turn on even when plugged in.
I've seen cleaner heads give far worse a picture! It almost looks as if someone cleaned the heads with something they shouldn't have to see if it would work. But again, the DVD was not working, so.............why would they, but stranger things have and will happen!
cheap, cheaper, cheapest as can be! we remember the first Video Recorders and now this end of time Video machine. I'm shame on my profession "Radio & TV Mechanics"! I'll learnd at Grundig Radio & Television Mechanics and this Video Recorder is near the end of the end! What do you mean? Best Regards Volker from Vienna Thumb up 538!
Built for a price point. That's the way it goes. Couldn't wait to get out of the business in 2003. Contrary to what many think I am not in the business anymore. I take on projects selectively only to make videos now for my RU-vid channel. If i want shooting videos of this old junk i wouldn't be touching it.