JP1 Remotes

I don't think so. I think your remote has the full JP1,2 interface. I think the learning subcircuit is different.


Any idea what U2 is on the 8820? It's an eeprom here:

It's certainly NOT an EEPROM in your remote.

My best guess is they found some IC that does the amplification of the learned ...

After a night in with my soldering iron I have a JP1.x circuit, however I've obviously done something wrong, as now there is no flash from the remote when I test the connection, and the remote freezes until I remove the batteries... :-)

I'll continue with this however, I could really do with the ...

I don't have the HC266 to make the latest JP1.x interface but I'll make up the old design and try it out.

The cable was this one: http://www.diygadget.com/store/jp1/jp1- ... od_25.html

From what I read this cable doesn't have support for any other versions than JP1.2

I've opened up the cable and everything looks fine - no capacitors in place of resistors. I guess I have to presume the cable is working correctly.

I'm also glad to hear your feelings on the remote, it would be great to get this one working, but I don't want to waste too much of your time. I'll ...

I've tested the interface and it returned the strings to N&B Com test no problem.

What I mean is I followed the instructions in "Everything you need to know about testing JP1.x" and used resistors and a 9v battery to test the loopback functionality - it all worked as described. I will try to find ...

I don't believe my serial port is the problem.

If I monitor the serial port while running JP1xTEST.EXE I see the program send the E character (0x45) three times, each time the remote replys with 0 (or doesn't reply - I'm not sure how to tell the difference).

The remote's led pulses for 1 second ...

Why didn't I think of that? :oops:

Pins 1,2 & 3 all test perfect - zero resistance.

Pin 4 & 6 show continuity but resistances of <200 ohms - I presume that's how they work out which switch has been pressed?

Pin 5 connects to one side of R2 and continuity is perfect here.

I also tested there was ...

Somebody just promised me their weller soldering station, so hopefully by this weekend I can rule out the possibility of dry joints. I've been using a real joke of an iron up till now.

While I'm waiting, does anyone know if there's a possibility that this remote has been 'locked' out of JP1(.x) use ...

I was wondering about that too. For instance I receive one blink on my remote's LED, however the program fails to find a JP1.2 interface.

Does 1 blink signify anything?

Correct on the IR and led setup.

The -ve side of the IR emitter goes to ground and the +ve to Q1.
If Q1 is a equilateral triangle sitting on an flat, IR +ve goes to the top, left connection goes to R6, then U1. And the right signal does go to R5 then Vcc.

From R15, trace goes exactly as you said ...

Thanks John I'm giving this all a go right now, will report back.

ragawu wrote:The chip is underneath a small circle of resin about the size of a squashed garden pea. You can see this at the top of the pcb.

There is no big socketed chip like on my earlier revision sky remote.

Maybe I answered my own question and this remote can not be modified.

You probably need a JP1 cable as JP1.x remotes don't have an area for an EEPROM chip to be soldered on. The EEPROM is built into the chip.

I'm not certain position U2 is for an Eeprom, I was just conjecturing. :-)

I still believe this remote is a JP1.2, but I'd be keen on finding out how big the ...

The chip is underneath a small circle of resin about the size of a squashed garden pea. You can see this at the top of the pcb.

There is no big socketed chip like on my earlier revision sky remote.

Here is the underside: