No success...
I have now replaced all Elcos in POD and CB, and changed the LM358N to a new one (in a nice socket ;-)). But it shows the alarm when switching on.
Are there any possibility to override a part of the circuit to check which part is out of order?
Thanks, Sebastian
Edit: I have now tried to simulate the thermistor with an variable resistor, in the range from 900 to nearly 1100 Ohm (I found this as the "normal" values). In this range, the lights are flashing too, but the POD is beeping, too. Another reaction, same failure.
Any more ideas? How can I bridge this failure?