Technogym spin trainer Maintenance Manual page 16

(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 by executing 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.
Through an RS-232 cable it is possible to print out the data of the current training session on a
serial printer
(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 proportional to the
excitation voltage received 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.
(8) FAN
Cooling fan for the person using the machine, which is put into operation by pressing a button
on the display. Because the fan is powered by the alternator output voltage, it does not run
when the machine speed is zero, and its airflow increases as the power generated by the
alternator increases.
Page 3.2
SPIN TRAINER: Service & Maintenance Manual - rev. 2.0