JP1 Remotes

Hi all, I've been going round in circles trying to program a remote with some service codes to disable S-VHS from being detected on some non S-VHS tapes. I am trying to archive to digital and this problem is making the signal wonky on certain tapes.

I have read quite a bit of info that there is a service mode remote for VCR's including mine (details below), so I thought I'd go back to the beginning and ask if anyone has a service remote for JVC or knows if for example there's a standard way of programming a remote with JP1 to be a service remote.

I've tried some know JIG commands but so far nothing is working. All I can say is I can definitely enter JIG RCU mode on the VCR.

My VCR is an HR-S9850EU and I have the original LP20667-008 remote for it.

I'm told the typical service remote is called a JVC PTU94023B and there is an image of one here https://www.replacementremotes.com/jvc/ ... te-control.

Does anyone here know anything about this? Otherwise, I think this expensive S-VHS player may be little use for these specific tapes.

Thanks.

This JVC VCR file has some service mode functions in it:
http://www.hifi-remote.com/forums/dload ... le_id=1300

There is hole in shell of the S-VHS tape to tell a S-VHS vcr that it is a S-VHS tape. Cover this hole with electrical tape to trick it into thinking it's regular tape.

My problem is that VHS tapes are being detected as S-VHS tapes sometimes for parts of tapes, sometimes for more than that. Just on a few tapes. So I don't think this will fix that?

If you had the service remote, would you know what to do with it?

Are you offering to send me one?

What I meant was, if you had one, would you know what to do? The reason I ask is, I posted an upgrade that has buttons to get you into the service mode, so if you know what to do, give it a try.

Thanks, I was actually just editing my reply as I see you're the site owner and you're obviously not being obnoxious (wasn't initially apparent). I know you know where I'm coming from when some unknown keyboard warrior keeps second guessing everything you say. Anyway, what I was writing in the edit was:

Yes, though I dislike writing these justifications cause I sound like a plonker.

But, I have 30 years in tech IT roles and went through school of audio engineering, I have done quite a bit of reading on this issue, including through the service manual, some concepts are going to take some trial and error though as I'm obviously not an expert in servicing JVC vcrs.

A service remote would be wasted on me given I only need to turn one feature off and on, if I could borrow one from someone in NZ that'd be awesome, otherwise I'm left with programming using JP1 or another option is to wire something up with an arduino and Infrared transmitter. I've successfully managed to do my first remote programmer with Remote Master last week so I will certainly be trying the link you posted shortly (thank you very much for that, it's exactly the kind of thing I was after). Hopefully with that I can enter an on screen menu that can handle the rest of the task from there).

Otherwise, I assume I'll have to get some specific codes for the commands. The difference with my unit is that despite entering Jig Mode, I'm not getting a menu

So I programmed in the service codes. The enter service mode didn't do anything, which is probably not surprising since I have a JIG mode unit and I think that it enters service mode a different way. But the exit service mode button did give me some kind of status screen that read:

OP: 03 DDDDDDII
AP:54:74
67 4E 19 50 50
32 ЗА 33 20
32 ЗА 33 20
04 04 04 0A 09
00 00 02

I'm pretty sure OP 03 is a mode and I'm pretty sure I need to be in mode 1, I need to watch a video again to be sure.

The end of this video explains how to use the JVC one and I think had mention of the mode (I need to rewatch) : https://www.youtube.com/watch?v=BzhQr6KnK30

I appreciate this is well out of the normal bounds of this site, but in case anyone knows anything, I'd be grateful for any responses. Otherwise I may just have to build a direct from drum reading circuit and do it in software.

marshalleq wrote:My problem is that VHS tapes are being detected as S-VHS tapes sometimes for parts of tapes, sometimes for more than that. Just on a few tapes. So I don't think this will fix that?

So is the issue is with only some VHS tapes? What happens if you play these troublesome tapes on a standard VHS machine? Do they play properly?

Yeah, they do, from my reading there are 3 maybe 4 ways a deck can detect a tape is S-VHS including some kind of signal on the tape. My suspicion is that these olds tapes are fooling the player into switching into SVHS mode because of some signal issue. It happens for say 3-5 seconds repeating every 10 seconds or so (just on these few tapes), though two of them do it 100% of about the first 3 minutes - coincidentally the part of the tape that is likely to be the worst condition.

To predict the next question, the reason I'm not using a standard VHS player to archive them is because the S-VHS player plays standard VHS tapes in a much higher quality than a VHS player does. Being that it combines a TBC with an S-Video out for luminance / chrominance and has a bunch more modern engineering on it as well. After this I have an external BigVoodoo 10 Framesync device, some specialised capture gear and so on. And yes, that's all working correctly.

So if I could turn the S-VHS tape detection off (and I know it's possible on other JVC S-VHS decks) then that 'should' prevent this problem.

I have asked the guy that posted that video if he's thought of backing up his service remote with the tools here, at this point I'd pay to get him a remote and USB connector to do it all with. However, there is a weird part of the procedure to press buttons 3,4 and 5 while inserting the batteries that I suspect won't transfer well.

Fun to try though!

The reason I asked if you would know what to do with a service remote to turn off the SVHS feature (eg, press button A, then hold button B, then type 123, that sort of thing), is because I have no idea how you would use a service remote to do what you need. So, if your next question was "ok, so I've loaded the upgrade that you posted, now what?" I wouldn't be able to help you.

I've never owned a JVC VHS player (at least, not that I remember), and I don't think I ever had an SVHS player, so I'm not that sort of SME, I just know remotes.

Yeah all good. The download may be a good start - I'm learning all of this. Presently though I suspect building a circuit is going to be simpler - which is pretty surprising. This is just a remote site, but it has a lot of people with devices on the end of the remotes, so it was with the ask. Thanks!