FX-4C no power

Suddenly I had almost no power output at all on 12 meter band. It turned out that I had accidently turned the AF knob while transmitting and this set the power calibration wrong. To solve this, I did:

• Connect a dummy load
• Set CW mode
• Press PWR button and turn AF knob to 5 watts
• Press and hold key (PTT) and while transmitting, turn the AF knob until the meter displays as close to 5 watts as possible

Now the power calibration is done and the rig will output power as expected,