Join Date: Feb 2005
Location: Adelaide, Australia
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It might not be sending the commands for long enough. Try increasing the number of repeats for the device(under "Troubleshooting" -> "This device doesn't respond to some commands").
You could also try holding the original remote button down longer when you teach it in RAW.
Failing that, you could try to get the IR codes from JVC in Pronto HEX format. If you can, you can email them to Harmony tech support and they will add them to the device profile.