Quantcast JVC HR-DVS3U No picture in play, but image in pause/FF? - digitalFAQ Forum
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  #1  
07-30-2020, 04:51 PM
Jfeat Jfeat is offline
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I've used this JVC HR-DVS3U for a long time with no problems. Transferring a VHS video for a client, there was a "jam". Since that time i get no picture while playing but if I pause, FF, REW etc., I'll see the video. Sound is there just not the video. There's a video head cleaner device with what looks like wire ties that appear to attach to nothing. I've cleaned the heads, tried different tapes but I still have the problem.

Any Ideas on how to cure this or where to get more info?

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  #2  
07-31-2020, 06:38 AM
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lordsmurf lordsmurf is offline
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Video head cleaner actually cause more damage, by merely pushing around debris, not actually removing it. Those also tend to be abrasive.

Multiple potential issues here. If after a proper cleaning -- PROPER CLEANING! -- it's still not resolved, it's not a simple head clog issues. It may be head damage.

How was it jammed, exactly? That will help you trace if the issue is in bands, gears, etc.

It may alignment, but that's have to be a really ugly jam to misalign the guides.

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07-31-2020, 03:23 PM
Jfeat Jfeat is offline
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Thanks!

I did NOT use a head cleaning cassette,etc. I used a tech wipe and isopropyl alcohol. This model has an integrated "head cleaner" that lifts when tape is seated (see photo). I also cleaned the erase head and the A/C heads. I assume the A/C head is for audio/control.

After cleaning low and behold the tapes would play for a short time then the counter stops and the auto shutdown happens.

What should I use to clean the heads?


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07-31-2020, 03:26 PM
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Are the tapes being fed now have ANY visual defects? Inspect a tape after running it through, and rewards about a minute worth of footage (no more!). 1 min for SP, or 2 LP, or 3 SLP/EP.

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08-01-2020, 01:32 PM
Jfeat Jfeat is offline
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Checking tapes, they show no damage (magnifying glass). It definitely seems to be with the video heads. It will start to play (counter looking normal) and the sound is good. The operation tho is a bit flaky; cant rewind or stop but can FF. Like all of the heads are not reading.
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  #6  
08-01-2020, 04:13 PM
hodgey hodgey is offline
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Do you get no output at all in play mode, or very garbled output? (may be hard to spot without an external TBC or a CRT TV, and I don't know if the JVC blue screens on bad signal or not).

I have a cheapo hitachi that does a similar thing where there seems to be little output from one of the heads (not sure if it's the head or some electronics, it sometimes works after a while), so every other field is mostly noise in play, while ffwd seeking and pause looks mostly normal. VCRs with more than 2 heads can often use a different combination of heads for normal play and seeking/pause to achieve cleaner images in those modes, so you can end up getting something even though not all heads are working well.

Not being able to rewind or stop may suggest that there is something more wrong though, maybe the snag caused a gear to skip or broke/bent something.
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