Newbie here!!

MX 780
MRF 350 w RFX 250

I sold my client a Denon 4520 to replace their Marantz 7005.

When I programmed the MX780 the AVR "ON" button would not
work in RF ...only IR line of sight. All other commands work no
problem with RF.

To test I made a file with only the ON and OFF commands and set the MRF 350
etc.

The MRF 350 is hooked up directly from IR Output port 1 to the AVR IR
control In.

Tried the different hex codes from the AVR 4520 IR Code PDF
All worked except the ON command

Changed the RF ID on the 350 and in CCP

Checked for interference on ID 0....none

Tried learning the command instead of converting it with Denon
Pronto Hex Converter

Tried setting it to RF only and IR&RF

Used Blaster 1 and IR emitter

When I press the ON button both Leds light up on the 250 & 350

I do not have another remote to see if it behaves the same way

Any thoughts?