Thermador CJ302B Service Manual page 73

CJ Oven Service Manual Lit. No. 94-30-007A
Digital (DAC) appliance control
The digital appliance control (DAC) control is a microproccessor based control.
What this means is that the dac control uses signal voltage to detect switch function.
The switches used with the DAC control to detect signal voltage are;
Door switches: activated by door movement.
Air switches; activated by air movement from the blowers
Latch lock/unlock switches; activated by the latch cam movement.
Door switch function is critical in the "CM" oven. The oven door must physically
close before the oven can proceed into self clean or microwave modes.
Latch lock/unlock switches must physically open/close before the oven can proceed
into self clean or microwave mode.
The air switches must also physically close by air movement from the cooling
blowers before the oven proceeds into a bake or broil mode. If the cooling motor
does not function and the oven goes into a bake or broil mode, the oven will overheat
and could damage components.
Heres how it works:
The board sends out signal voltage (24 V.A.C.) to specific switches. If the switch is
functioning properly, the signal returns to the board and the microprocessor chip
reads the signal voltage and the function continues. Example:
Signal voltage flows to the air switch. When the air switch closes, the signal returns
to the dac control. The oven continues. If the air switch does not close, the signal
does not return to the board. The board will then flash an error code. Simply stated,
the board sends out a signal and the signal must return to the board.
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