JVC SR-V10U start sensor?

[abpcipmvp]

hello all,
JVC SR-V10U Start Sensor

Garage sale find, upon inserting cartridge, tape does NOT wrap around head and after a few seconds ejects tape. Checking on the Start and End Sensors, I noticed that the board does not have a start sensor(Q3001). It has an End Sensor, which checks out good(checking for voltage transition on the lead when blocking led). Taking the main board out and checking the bottom it does not seem that a start sensor was ever on the board. No soldering marks or signs of removal. Do these vcr's have another method to detect start of tape???

[lordsmurf]

The #1 most common fail point on these SR-V10 is the motor, either weak or failed. No replacements exist. And donor decks don't really exist either, since this is often what failed.

For this reason, I entirely avoid V10U now.

[abpcipmvp]

ok,
Thanks for the heads up, I'll just park this project then.

[aramkolt]

Like the loading motor? I think the VS10 is mostly the same as all of the other modern JVC SVHS machines (outside of the maybe SR-MV series). Maybe post a picture of the inside and a video of it trying to load with the VCR top off.

[abpcipmvp]

I took it to understand that the capstan motor was to blame. The Loading motor seems to be ok, tape falls into position and movement is initiated, but it gives up then ejects the cartridge. Their is a service mode on this model, and i can go through all modes ok with that ( without a tape), but once I insert a tape, it just wont wrap the tape around the head and ejects tape. I could probably take video and post it, if its allowed. It might not be worth the trouble if its, going to be a problem down the road.

[lordsmurf]

V10 motors are weak, and some make awful struggle noises. These were always bad, even when new. Eventually it just fails to load or eject, and the exact part is specific to this model.

JVC made some flawed gear, but it was years before we noticed. The JVC DV combos, for example, had POS tape-eater DV decks, engineering flaws. Or this V10.

Yes, attaching a video to the post is allowed -- and encouraged.

@aramkolt: I may have a non-working V10 in the attic. I may put together a care package for you, eventually (not soon, not yet), so you can see some of this stuff for yourself. TBCs, VCRs, capture cards. I'm just not able to do some of this myself anymore (health), as the repairs have gotten so complex in the past half decade.

To me, the V10 is really a model to avoid now. (Not to be confused with "V10-based", a term I often use for certain EOLs.)

Hopefully @abpcipmvp didn't spend more than $10 at the garage sale. Most likely, it was always bad, and a bad buy from eBay. It's so common these days. Garbage gets passed around. It's eventually parted out, but more likely trashed or recycled. The recyclers list it on eBay, and the cycle repeats.

[aramkolt]

I've got one V10U that I'm guessing at some point was used in a more automated transfer facility because it had extra non-factory wiring that went to the front panel. It didn't power on at all when I first got it, but I was able to replace the main switching IC and that got it going again and I did the rest of the usual refurb stuff. I didn't really notice too much in the way of abnormal playback and it looked pretty similar to other JVCs of the era inside, but if I had a video sample showing what to watch for I could see if mine has it or not.

[lordsmurf]

Have you verified gear and belts on the underside of the transport? I jumped to the most common issues (motor), but there's always a chance that it's the lesser belt/gear problem.

Do you have the service manual downloaded?
Get it here: https://www.digitalFAQ.com/forum/vcr...r-manuals.html

[latreche34]

@ OP, I don't think the issue is a tape sensor, It's either the mode switch or whatever preventing it to go to the next mode like video drum spinning failure due to blown CP or capstan motor if the capstan drives the tape threading mechanism.

[lordsmurf]

Yes, I agree, I think any sensor is easily already eliminated.

Blown drum (head cylinder) is possible, though I'm not so sure here.

But I doubt it's the mode switch. That's almost never the issue. That's a unicorn, not a horse. Youtube videos have blown it way out of proportion. I see videos where the issue was obviously something else. The person takes everything apart, down to the mode switch. Needlessly cleans it. Then puts everything back together properly. And then it works, and the person proclaims cleaning the mode switch helped. But disassembly and reassembly is what did it, fixing/unjamming something in that process. I somewhat blame 12voltvids for this fixation. It reminds me of all the bad advice to needlessly clean the heads, as if a dirty head has anything to do with a unit not powering on, not loading tapes, etc.

Faulty logic:
- John likes bananas.
- John likes blue.
- Bananas must be blue?

[latreche34]

It may or may not be the mode switch but any fault related to completing one mode and not going into the next mode requires checking the mode switch automatically due to the age of these machines, In fact I would suggest checking the mode switch first before attemting any other diagnosis.

[jbd5010]

I have an SR-V10U that I bought ~12 years ago. I got about halfway through my VHS project and then stopped, then moved to a different house, and finally I'm now getting back to the project. I find that on some tapes, it doesn't want to wrap the tape around the head. The first time it happened, I took the top cover off and when I observed where the loading process was getting stuck, I gently pushed one of the roller assemblies/loading arms, and it finished loading and played just fine. It seems to happen on every 5th or 6th tape. I ordered what I think is a suitable replacement for the loading motor belt - it comes today. I can follow up and let you guys know if replacing the belt makes a difference on the tapes that are known to have loading issues on my deck.