I have in my workshop a HITACHI VIDEO DECK VT-39EM type of VCR with head switching problem. Did you ever meet this type of VCR before? I would like to ask your help. Did you have datasheet for the following IC's HA11736, HA11747 and Service manual for the VCR in question?
Hey... I purchased a Sanyo VHS DVD combo unit 2 weeks ago and started burning DVDs ... then all of a sudden the VHS tapes don't play a good picture... sometimes no picture. I tried cleaning head tape -- that didn't work. I haven't poked around inside to clean and after watching your video, I am thinking I have a ton of debris -- so I grabbed a flashlight and looked inside and it looks like a bunch of tiny black hair pieces are all over the right side of the unit. What are your thoughts?
I just noticed that when I play a tape the counter doesn't move. The tape is running but lots of white and black lines throughout it and some goofy static with the audio. Any thoughts as to what I should do. I spent over $500 on this unit just 2 weeks ago.
***** I have one here you can have for FREE. Weighs a ton though, so shipping would be a fair chunk of change. I got it for free, and don't need a second scope.
***** It would cost a fortune to ship it across the city never mind half way around the world. With all the shops closing their doors these days you can probably find a free one like I did. A shop closed up, and they were literally giving away old test gear. I got an audio generator, signal generator, scope, and a fluke meter for 10.00!
Hey after seeing this video I think head switching error is what is wrong with my HS-U82 but I have no idea where the head switching circuitry is located. Guessing HS-U82 has a common cap or failure of this circuit. You have any knowledge of common failure modes or where that bad cap may be on the HS-U82?
I am familiar with the comb filter problems on the HSU82. I have a video up on that model. Go look back, I overhauled it months ago. The U82 was the one with Dynamic tracking, and is the same machine as the Electrohome J05, which is the machine I have. Go look up the Electrohome j05 as I did a service on that machine.
Dear @12voltvids I have a Panasonic VCR model NV-FJ635 and even cleaning the head the image has some noise and some black spikes on high contrast mainly on subtitles. I've tried to search for a kind of short-circuit but didn't find. Please, could you tell me if this problem could be on the power supply capacitors?
@@NunYa953 I have a dvd vcr that gets this same thing when trying to play a tape because i played a damge tape that it eated and i manoverd the tape and then i got this i havent tried cleanig the heads do think my vcr will work if i clean the drum?
@@SwedishRetroTechNerd First thing I would do is clean the heads. CLEAN THEM PROPERLY. A SMALL PIECE OF WHITE PAPER AND MINIMUM 91% ISOPROPYL ALCOHOL. Add the alcohol to the paper, hold it against the drum and rotate it counterclockwise. DO NO USE A CLOTH OR QTIPS OR ANYTHING LIKE THAT.
the head is ok i record and play back the cassete from other vhs vcr..the it have pictur and sound but the picture not steady..same as track error and counter did no move
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Great! Very interesting! Useful to see the signals on the scope there and the possible cause.
You seem to be a very simple and humble person. Likes and Respect :)
I have in my workshop a HITACHI VIDEO DECK VT-39EM type of VCR with head switching problem. Did you ever meet this type of VCR before? I would like to ask your help. Did you have datasheet for the following IC's HA11736, HA11747 and Service manual for the VCR in question?
Great video ! Question : I cannot get a stable signal on my scope, it's always scanning the RF signal, do you trigger the scope in a certain way ?
Ac coupling.
Hey... I purchased a Sanyo VHS DVD combo unit 2 weeks ago and started burning DVDs ... then all of a sudden the VHS tapes don't play a good picture... sometimes no picture. I tried cleaning head tape -- that didn't work. I haven't poked around inside to clean and after watching your video, I am thinking I have a ton of debris -- so I grabbed a flashlight and looked inside and it looks like a bunch of tiny black hair pieces are all over the right side of the unit. What are your thoughts?
Could be a tape that the binder is bad and the magnetic coating is sheding and ending up all over the inside.
I just noticed that when I play a tape the counter doesn't move. The tape is running but lots of white and black lines throughout it and some goofy static with the audio. Any thoughts as to what I should do. I spent over $500 on this unit just 2 weeks ago.
What are the specifications of the scope you need.Can you use a digital scope?.Are the specifications the same for a tv.
Yes you can use a DSO, it will work just fine.
The scope I have is a 30 year old 40MHz Iwatsu analog 3 channel scope.
Nothing fancy.
12voltvids Great.I will search for a secondhand analog scope.They are not so expensive as a digital.Thank you for your feedback.
*****
I have one here you can have for FREE.
Weighs a ton though, so shipping would be a fair chunk of change.
I got it for free, and don't need a second scope.
12voltvids Thank you very much for the offer but i live in Holland.That would be very expensive to ship.lol
*****
It would cost a fortune to ship it across the city never mind half way around the world. With all the shops closing their doors these days you can probably find a free one like I did. A shop closed up, and they were literally giving away old test gear. I got an audio generator, signal generator, scope, and a fluke meter for 10.00!
Hey after seeing this video I think head switching error is what is wrong with my HS-U82 but I have no idea where the head switching circuitry is located. Guessing HS-U82 has a common cap or failure of this circuit. You have any knowledge of common failure modes or where that bad cap may be on the HS-U82?
I am familiar with the comb filter problems on the HSU82. I have a video up on that model. Go look back, I overhauled it months ago.
The U82 was the one with Dynamic tracking, and is the same machine as the Electrohome J05, which is the machine I have. Go look up the Electrohome j05 as I did a service on that machine.
12voltvids
Great thanks I will do that. Love your videos!
hi 12volts I have a go video vcr duel deck it says error do u know the problem
Dear @12voltvids I have a Panasonic VCR model NV-FJ635 and even cleaning the head the image has some noise and some black spikes on high contrast mainly on subtitles. I've tried to search for a kind of short-circuit but didn't find. Please, could you tell me if this problem could be on the power supply capacitors?
Worn heads.
@@12voltvids ok, thks! So, I will need to change the heads or there is a hope for the worn ones?
@@ettorereis5800
Once they are worn they need to be changes. Good luck finding one now.
I had this ( black spikes ) with my JVC ( forgot model, don't have it anymore ). Problem was small capacitor near TDA video chip.
I have a Sanyo Model VWM-370 VCR that pulls the tape in,ejects, and pulls it in again only toeat the tape. Can you help?
It may be belt problem. When my VCR motor belt was worned out tape automatically ejected when pulled in.
Dirty mode switch deoxit d100 and clean the contacts for starters
I have a GO. Video combo DVD+ VCR player the DVD player plays but the VCR part doesn't it runs but no video what could be the problem
If the drum is turning and tape plays it's probably your tape path or dirty heads.
@@NunYa953 I have a dvd vcr that gets this same thing when trying to play a tape because i played a damge tape that it eated and i manoverd the tape and then i got this i havent tried cleanig the heads do think my vcr will work if i clean the drum?
@@SwedishRetroTechNerd
First thing I would do is clean the heads. CLEAN THEM PROPERLY. A SMALL PIECE OF WHITE PAPER AND MINIMUM 91% ISOPROPYL ALCOHOL. Add the alcohol to the paper, hold it against the drum and rotate it counterclockwise. DO NO USE A CLOTH OR QTIPS OR ANYTHING LIKE THAT.
i have aiwa vcr no picture and no sound output.. when i fix av cable in from other vcr all ok..what cause that issue?
the head is ok i record and play back the cassete from other vhs vcr..the it have pictur and sound but the picture not steady..same as track error and counter did no move
This is maybe the problem with my vcr. I screwed up alignments on p2 and p3 rollers and AC head... 😔
I hate it when my head switching pulse is distorted! That's a day ruiner.
Hi, I have my sony slv 757 I have this problem😔 I cleining head, end no clean picture,help me where is problem, a love you clips vhs 12 voltvids!
Sir,can you service my funai vp300 vcp model..when i insert the tape it just goes inside and makes loud noise and system powers off
Its vp3000..
And after power on you are able to eject tape?
h have jvc same problem