Bayer HealthCare RapidPoint 400 Series Service Manual page 45

The contact board provides the junction between the connector block and
the sensor module. It processes signals from the sensors and provides
biased, filtered, and amplified results to the system. The sample thermistor
is located on the contact board. The sample thermistor senses the
temperature on the back of the sensor chips. If the thermistor detects that
the temperature of the chips is less than 37°C, it signals the main heater to
increase the temperature of the chips to 37°C.
The multiplexer board takes the signals from the contact board and
simultaneously transmits them into one signal that travels back to the
system. A programmable gain amplifier on the multiplexer board provides
the gain and the offset to the signals. The circuitry on the board also
amplifies the signal from the thermistor. Additionally, the multiplexer board
provides various excitation signals to the contact board, such as power and
digital timing signals.
The contact system protector shields the contacts from becoming
damaged when no measurement cartridge is present.
There are four alignment pins on the connector block assembly: two small
pins align the sensor module with the connector block, and two larger pins
guide the connector block into position.
Rev. C Mechanical Descriptions 45