TS480 not transmitting on CW

[EA4MY]

Hello
Until yesterday, my TS480 had been working flawlessly for years with my pair of RRC1258. Today, when I switched on the equipment and tried to transmit on CW, it wouldn't transmit, although it did on SSB. When I´m keying the paddle (or stright key), I hear the control RRC' sidetone as always, but the TS480 remains in reception and didn't transmit. I certainly hadn't made any changes to the configuration. Any hint what the problem could be and how to fix it? Thank you very much in advance.
Best 73
Antonio, EA4MY

[EA4MY]

After carefully checking all the parameters on the side Radio and Control I found out that the OUT2 output of the RRC Radio had unexpectedly changed from “Keyer” to “ON/OFF”, so the  RRC  Radio  was not keying the TS480. The problem is fixed but remains the question why happened this without any intervention.

Antonio, EA4MY