So far we've never come across a failed circuit board. They are well made with decent screw terminals for connecting the wires with.
Here are some pictures:
Non Switch Side
The temperature on Cloud 9s can be calibrated using the two variable resistors:
- 'SVR1' adjusts the switch-side temperature
- 'SVR2' adjusts the non switch side side temperature
Cloud 9s have a variable temperature setting. When the LED's show 150c the actual temperature is normally within 0.5 degC on each plate once the heaters have been calibrated. At 200 degC the temperature is usually about 195c and 'High' is about 205c.
There are two newer versions of this PCB - a number of faults can be had with these. It's best to use the repair-service in this instance...