BSH Thermador CEM304, Service Manual

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CEM/CET/CEP Service Manual
PAGE 17
Input board
The input board has three functions. First, it accepts mode and setting selections by the user. Second, it
commands the relay board to perform the selected functions. And third, it outputs a signal voltage circuit to
the element sensors to determine the presence of a pan , and the size of the pan. The input board is not glued
to the ceramic top. It is located in the rough in box below the ceramic glass. There are conductive bellows
between the board and the ceramic glass to provide continuity (see illustration).
Voltage is constantly applied to the relay board. The voltage creates an electro-magnetic field around the input
board. W hen the user touches the ceramic glass and makes a selection, the circuit is interupted. This interuption
is interpreted by the microproccessor chip and the board is commanded according to the selection made by
the user. (see illustration).
O n units with the pot sensing/pot sizing feature, the board sends a signal voltage to each sensor in the
elements. W hen a pan is put on the burner, the sensor sends a signal back to the input board. The signal tells
the input board the presence of a pan and the size of a pan.
Ziff Connector ➝
➝
Connector for
Pot Sensor
Circuit Board
Component Description
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