Quantcast JVC S-VHS dropout comets, tracking creep, VHS fine? - digitalFAQ Forum
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  #1  
09-03-2020, 11:49 PM
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lordsmurf lordsmurf is offline
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I've seen a lot of things, but never this.

Acquired a non-working SR-V101 deck in trade, good refurb candidate. Had gunk on lower stationary head cylinder. Cleaned that off. Some transport ingest/eject issues, also caused by grime and bad lube. Alignment was shot, way off, wouldn't even lock SP. Adjusted guides, better now. An "easy" job, but time-consuming as usual, took many hours.

The unit meets my A+ criteria for tracking EP mode VHS tapes. Auto-tracking is spot-on almost every time now. The image is clean, audio clear. This is actually an unusually nice JVC deck! So the heads appear to be fine -- better than fine.

But on S-VHS and S-VHS-ET tapes, it suffers from dropout comets on screen (tracking based?). Then tracking creep, both sides randomly. Then loss of v-hold. Repeat.

The VHS is perfect.

How could only S-VHS be affected?

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  #2  
09-04-2020, 01:06 AM
latreche34 latreche34 is online now
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Did you try those S-VHS tapes on the composite output? not the Y/C socket.
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  #3  
09-04-2020, 09:12 AM
hodgey hodgey is offline
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What does the comets look like? If you have a service remote, adjusting the SVHS frequency response setting could maybe have an impact. I haven't touched it on a JVC as I don't have the service remote or remote codes for it (if anyone has remote codes let me know.) but I've done a similar adjustment on a panasonic deck where it's done with trimpots. If there is some component drift it can affect the filter on the raw RF signal which these settings adjust. I don't know if this would affect tracking though.
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