An ice cube maker stopped working with the symptom that the temperature cycles are getting shorter and shorter.
I suspect that the microcontrollers clock is not working properly.
I desoldered a part near the clock and I want to replace it.
It is labeled '4.00 J'. I can not identify the part and google did not put out useful information for me.
The microcontroller is this one, page 19 shows its pins. The XT component center pin (pin 2) is connected to vss. XT pin 1 os connected to XIN/P1.0. XT pin 3 is connected to XOUT/P1.1.
Most confusing for me is that the XT component has a 'J' printed on it. What does that label mean and what could be my unknown XT component?