Technogym BIKE XT Service Maintenance Manual page 14

(2) CARDIO RECEIVER
It is connected to the machine's CPU board and receives the pulses sent by the transmitter. Its
reception area is approximately a circle of 1 meter of radius. If there is electromagnetic noise
(produced by high voltage lines, radio transmitters, monitors, motors, etc.) within its reception
area, the receiver becomes saturated and stops receiving any signal. If there are 2 transmitters
within its area of reception, it will receive signals from both, and may produce an error or
irregular reading.
(3) CPU BOARD
This is the heart of the machine, which controls all the machine functions according to the
instructions of the program stored in EPROM. It receives information from the user (age,
weight, etc.) during set-up of the training session, from the cardio receiver (user's heart rate)
and from the alternator interface board for displaying workload data (Watt and RPM). It
controls the difficulty level selected with the + - keys or according to the chosen training
program.
(4) POWER SUPPLY
Receives the mains voltage at its input and outputs the DC voltages (+5 V, +12 V and −12 V)
which supply the display and the alternator interface board.
(5) ALTERNATOR INTERFACE BOARD
Receives from the display a square-wave signal whose frequency is proportional to the selected
level of difficulty, and converts it into a DC excitation voltage for the alternator. Receives the
RPM signal from the alternator, which it filters and sends to the display for calculating the
speed of rotation.
(6) ALTERNATOR
Is put into rotation by the user, and generates a resistance to the movement dependent on the
excitation voltage which it receives from the alternator interface board. It also generates the
RPM signal (6 pulses per revolution) necessary for counting the number of revolutions and
hence measuring the speed. Its rotation produces energy which is dissipated by the power
resistor.
(7) POWER RESISTOR
Has the function of dissipating the energy produced by the alternator.
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BIKE XT: Service & Maintenance manual - rev. 2.0