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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.
Only the traditional version of the component (non coded) is used.
3.1.3.
D
ISPLAY
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 driver board. It controls
the speed selected with the "+" "−" keys and the elevation selected with the "↑" "↓" keys or
according to the chosen training program. It receives the error signals for the tread-belt motor and
the up-down motor from the driver board, as well as the up-down motor pulses.
It consists of 2 circuit boards:
• CPU board: contains the microprocessor, the EPROM and all the control logic of the machine.
This circuit board incorporates a set of 4 dip-switches which is not currently used.
• LED board: contains the circuits for the LED indicators and the 7 segment display.
3.1.4.
D
RIVER BOARD
Consists of 3 distinct sections integrated into a single circuit board:
• Driver: receives from the display a digital inverter-enable signal and a PWM signal proportional
to the programmed speed, which it converts into a dc voltage for driving the inverter. In the
event of an anomaly, receives the error signal from the inverter and transmits it to the CPU
board.
The circuit board includes a trimmer, component R36, labeled "Reg. velocità" on the printed
circuit board, which regulates the conversion of the PWM into an analog signal in order to
adjust the motor speed.
• Up-down motor control: receives the incline "up" or "down" signals from the display, and
converts them into a voltage for driving the up-down motor. Generates its own supply voltage
and the dc supply voltage for the motor by means of the transformer and rectifier bridge.
Receives the pulses output by the sensor incorporated into the motor, filters them and sends
them to the CPU board. In the event of a motor overcurrent condition, shuts down the motor
drive and sends an alarm signal to the display.
The circuit board includes a trimmer, component R68, labeled "Reg. I Max" on the printed
circuit board, which adjusts the motor current limit.
• DC voltages by-pass: receives the low voltages generated by the power supply and sends them
to the CPU board.
Page 3.2
SPAZIO FORMA: Service & Maintenance manual - rev. 1.0
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