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digital_silence
Joined: 22 May 2004 Posts: 257
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Posted: Tue Jun 15, 2010 9:18 am Post subject: URC8811 remote is not recognised by IR... |
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Hi all,
Using a self-made Parallel JP1 cable that I have been using for years.
I have two 8811's and one 8910. Had them for 5+ years.
Now one of 8811's is not talking to PC via this cable (Can not d/load or upload, and interface check fails too).
Same JP1 cable works perfectly fine with other 8811 and with 8910.
Same set of batteries is used in all cases, to rule out battery factor (I am using fresh 1.5V primary non-recargeable Duracells)
The "sick" 8811 quite happily responds to all button presses, blinks the red LED and controls the appliances via infrared - so, it looks like it's feeling OK, but can't talk via JP1 to the PC.
Tried the factory reset (Set => 9-8-1) - didn't help.
Opened the 8811 unit and inspected the tracks and soldering around JP1 connector - all looks OK.
Any ideas as to what this may be, and how to get it back to talking to PC via JP1?
Thanks a lot. |
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vickyg2003 Site Admin
Joined: 20 Mar 2004 Posts: 7073 Location: Florida |
Posted: Tue Jun 15, 2010 9:26 am Post subject: Re: URC8811 remote is not recognised by IR... |
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digital_silence wrote: | Hi all,
Using a self-made Parallel JP1 cable that I have been using for years.
Same JP1 cable works perfectly fine with other 8811 and with 8910.
Same set of batteries is used in all cases, to rule out battery factor (I am using fresh 1.5V primary non-recargeable Duracells)
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Parallel cables can be very finicky. While all the other cables require good batteries, the parallel cables might need to have weak batteries or no batteries at all. Each of my JP1 remotes needs a different battery trick to talk to my JP1 parallel cable. _________________ Remember to provide feedback to let us know how the problem was solved and share your upgrades.
Tip: When creating an upgrade, always include ALL functions from the oem remote, even if you never plan on assigning them to a button. Complete function lists makes an upgrade more helpful to others.
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digital_silence
Joined: 22 May 2004 Posts: 257
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Posted: Tue Jun 15, 2010 8:43 pm Post subject: |
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Thanks, I'll try to connect a variable power supply to remote instead of the batteries and play around with voltage range.
Is there a schematics for URC8811, or at least a pin layout of the 6-way JP1 connector with the expected signal waveforms? |
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digital_silence
Joined: 22 May 2004 Posts: 257
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Posted: Wed Jun 16, 2010 7:47 am Post subject: |
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Got to the bottom of it.
The problem was in the 6-way pin header JP1 connector on the 8811's PCB.
Due to a poor quality of the PCB, the solder pads develop dry joints after a while as the connector gets pushed slightly every time you plug the JP1 cable into it.
Nasty thing, as it is pretty hard to spot - soldering looks perfectly fine from outside, but solder blobs don't make proper contacts with the copper pads under them (but I've been there too long to miss these things... :)
Removing the connector, cleaning the pads and soldering the connector back fixed the problem completely.
Just make a note of this - I have a feeling that I will be not the only one with that issue.
Regards,
:-DS |
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