Technogym BIOSTRENGTH LINE, Service Maintenance Manual

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BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 3.20
3.4.3. T
HE SIGNALS INVOLVED
The machine controls the seat position via the CPU board, the Bio servo board and the seat motor as
shown in the figure below:
The following signals come into play:
•
Motor up signal on (
↑↑↑↑
)
This is the signal generated by the CPU (pin 4-2 on connector K4) to enable the seat motor to
move the seat forward (up). This signal enters the Bio servo board (pin 4-2 on connector CN7),
and is processed by the latter to pilot the seat motor with the proper supply voltage.
The control logic states that when the motor up signal is low (~ 0 V) the motor is stopped and
thus not powered (0 Vdc), while when the signal is high (~ 4 V) the motor moves because it is
powered (24 Vdc). Thus the motor moves the seat forward (up) as long as the motor up signal is
high. The motor stops as soon as the signal returns to being low.
The figure below shows the switching of the motor up signal to move the seat:
Bio servo board
↓
CPU board
Reed sensor
↑ Alarm Pulses
Motor
4-2/K4
6-2/K4 8-2/K4 10-2/K4
4-2/CN7 6-2/CN7 8-2/CN7 10-2/CN7
1-2/CN2 PT2 5-6/CN2
Pulses