JP1 Remotes

An unusual circumstance I have never encountered before with JP1 devices has come up with a JVC DVD THA-25 Cinema system at my daughter's place (visiting for the holidays). Although it shares some commonality in codes with the DVD players in the Files section (mostly Device Code 239), the other Device Code used by the Cinema is 163.

The Cinema is a DVD player and AM/FM Receiver, with a remote can control a JVC TV as well (the 0-9 keys, CH+/- and TV Vol +/- are used only for the TV). The manual for this system is at http://www.retrevo.com/support/JVC-TH-A ... ag400/t/2/

Using the 15-1994 in Learning mode, every key comes up with a decode for JVC and JVC{2} with identical contents. There has to be some significance to JVC{2} because encoded keys on the Functions page do not always work e.g.

Power / DVD / FM/AM are fine.
Vol+ / Vol- / Mute do nothing.

All six are Device 163 codes. Neither the JVC protocol with Device set to 163 or JVC Combination with each code identified by Device work on V+/- or Mute whereas when Vol is Learned, it works.

The Learned memory can hold about half of the keys, hence there are two IR files.
1994_JVC_VCR.ir
1994_JVC_AUX2.ir

Remote Master equivalents to the Learned signals were built.
0239_JVC_VCR.rmdu
0240_JVC_AUX2.rmdu

Both sets of codes (Learned and Coded) coexist in the same IR file as VCR/CBL and AUX2/PnP.

Hopefully the attached files will assist in figuring out what the problem may be. They are located at http://www.hifi-remote.com/forums/dload ... le_id=7767

If any extra information would help, just let me know.

I read your post a few times but still mostly fail to understand what you are saying.

I understand learned codes work for vol (all three vol functions?) and upgrade signals do not work for those.

Do upgrade signals work for other functions?

I think there was another thread recently about JVC signals that were missing the lead-in on all but the first frame. I think that was the same problem as here. We may need an alternate executor for JVC. But I forget whether/how that other thread was resolved.

Since the last time I encountered the JVC protocol, it was being extremely picky on timing, I tried loading up the learns and compared them to the Combo protocol and the learns with my Widget. I can see that the timings are slightly off. The ON time for the upgrade is 550us with 21 flashes, the on times for the learns is 530us with 20 flashes. I can tweak the protocol to be closer to the learns, but before I get into the nitty gritty I'd like to know that the learned keys work.

Upgrade signals are quirky, some worked, some didn't. That is why I picked six codes which were consistently one way or the other as examples to illustrate the problem.

> I understand learned codes work for vol (all three vol
> functions?) and upgrade signals do not work for those.

Yes. All but one of the signals Learned from the JVC remote work, which prove that the 1994 is faithfully and successfully learning the signal.

The one exception to a 'clean' Learn is the Choice/Time key. All the Learned signals except 0-9 (which are used for the non-existent JVC TV) are included in the IRs, along with the Upgrade signal set which matches.

> Do upgrade signals work for other functions?

Signals coded by Remote Master with the same Device/EFC values are a hit or miss proposition, and after the first bout of strange issues, I focused on three examples of each to figure out the problem. My reasoning was that once they were resolved, the others would fall into place. Also, I focused on Device 163 because there were no previous examples which used that in the files.

I hope to find time today to extend my analysis on other keys.

> I think there was another thread recently about JVC
> signals that were missing the lead-in on all but the
> first frame. I think that was the same problem as here.

That makes me feel less alone....

> We may need an alternate executor for JVC. But I forget
> whether/how that other thread was resolved.

I saw nothing in my search of the site, but may not have used the right key words.

If another executor is needed, do you need anything more than what has been provided in the upload to develop it?

> ...before I get into the nitty gritty I'd like to know that
> the learned keys work.

Yes they do.

They are also consistent to the extent of when Learned from JVC on one 1994 is taught to the other 1994, the signal has the same EFC/EFC{2} pair i.e. after JVC-->1994A and 1994A-->1994B, the contents of the learned signals between 1994A and 1994B are the same.

Try this protocol for the JVC Combo. Its a little closer to the timings in your learns in the way of timings and frequency.

Upgrade protocol 0 = 00 98 (S3C8) PB v4.01
43 8B 02 8B 19 CC D9 80 20 08 08 01 13 00 F4 01
13 03 03 73 50 10 72 08 2A FF 03 FF 59 8C 8D 01
33
End

Wunderbar!

Everything is fine now.

The Upgrade keys are working as they should.

Many thanks for the assist.

What appeared to be a confusing insurmountable problem yesterday took less than a day to solve.

Fantastic.

Many thanks

Glad it worked.

Note to self, new JVC equipment is extremely sensitive to frequency/timings.

The other JVC protocol that John referenced was a JVC-48 which had the lead frame missing in subseqent frames, but it too was extremely sensitive to frequency and timings.

Its surprising how much the widget can show you in a picture. I would never have seen the difference from numbers alone (not a numbers person), but when the bumps don't line up on a picture it just jumps out at me.