Mitsubishi HS-E82 VCR Bad Picture

[hugocarmo]

Good morning everyone.
This time I have a Mitsubishi HS-E82.
It was a bargain that I found with original remote included.
The problem reported by the owner is that it was working but no output video.
I took it appart and immediately saw that three 470uf capacitors were leaking on the signal board and one in the Hi-Fi board the same value too. I have located them in the pictures in red marker.
I replaced them, cleaned all the liquid remains and the video output got working again.
I saw too that were three surface mounted capacitors, two near the 470uf and one in a vertical board. I replaced them too, they were leaking too.
I replaced one surface mounted capacitor in the drum motor pcb, it was leaking too.
Now, resuming.
I have video output, vcr menu and tv channels with good picture, if I attach RCA cables to audio input AUX, and a bluetooth receiver I have good Stereo Sound, but no stereo in tv channels nor tape playback. I have the problem you can see in the video that I´ve attached.
I cleaned the upper drum heads, with printer paper and IPA, like I do to my other VCR´s, no luck.
Is this bad worn heads symptoms? Or I need to investigate deeper in the pcb´s for more bad caps?

Thank You!

Hugo.

Video link
https://vimeo.com/886789022

[djski]

You really need to look at the RF envelope on the head amp board with a scope to properly diagnose an upper cylinder/head issue. The video does not resemble an RF problem with the heads but a cylinder servo issue to me.

[hugocarmo]

Originally Posted by djski

You really need to look at the RF envelope on the head amp board with a scope to properly diagnose an upper cylinder/head issue. The video does not resemble an RF problem with the heads but a cylinder servo issue to me.

Hi djski.
Thank You for your answer.
I managed to find the problem.
It was the tape left tape guide, the screw is very loose and it turned with the tape, managed to tune it and fixed it with thread-lock fluid!
It was more simple than I thougt!

Thank You!

[djski]

Originally Posted by hugocarmo

Hi djski.
Thank You for your answer.
I managed to find the problem.
It was the tape left tape guide, the screw is very loose and it turned with the tape, managed to tune it and fixed it with thread-lock fluid!
It was more simple than I thougt!

Thank You!

You have it roughed in. If you are able, to get it set 100%, the RF envelope should be checked using a scope and playing an alignment tape to ensure there is complete interchangability. You might have to further tweek that entrance guide to make the envelope as flat as possible and its amplitude is maxxed out with the tracking control centered. You may find the recordings from your Mits. may not properly play on some other VTR's or vice versa.

[hugocarmo]

Originally Posted by djski

You have it roughed in. If you are able, to get it set 100%, the RF envelope should be checked using a scope and playing an alignment tape to ensure there is complete interchangability. You might have to further tweek that entrance guide to make the envelope as flat as possible and its amplitude is maxxed out with the tracking control centered. You may find the recordings from your Mits. may not properly play on some other VTR's or vice versa.

Thank You again for your answer.
Really helpfull but I don’t have a scope, neither a alignment tape. You have any tips for any enough good for this kind of situations?
I have “good” image in playback but in pause or slowmotion jog shuttle, I have image bouncing up and down, horizontal and Color out of sync, I,m trying tuning in or out tape guides but maybe I can only get the best result with a scope, right?

Thank You very much djski.

[Blast]

Glad you're on the problem! Mitsubishi had a little problem with loose tape guides, maybe not as bad as JVC and NEC did, but it was a thing.

Are you sure that's not a HS-U82? If so, I looked at one of those in 1994. It had some BIG problems in the tuner control and RF convertor and parts and labor totaled $332.65 (plus tax). It was certainly a different day for VCRs in 1994.