Alpha chrono. not working.

On my Alpha Safari .22, my chrono. Isn't detecting shots. Red light is on, on the board when in fire mode, which means if I undrstand, the chrono. is getting power.But when it displayed the chrono. error message I took off the tube to clean the chrono. and the light was blinking. Cleaned everything and it didn't solve the problem. I
t doesn't detect a shot or gives a chrono error message on the display. If I understand correctly, I can shoot in advanced mode and because the parameters are set, it doesn't need the chrono. to shoot, but if I shoot in Factory mode, it needs the chrono. to seek and maintain the selected fps.??? Is that correct?

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