Technogym BIOSTRENGTH LINE - The Signals Involved

BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 3.9
The Bio servo board can check whether the solenoid is absorbing current (meaning that it is
energized, and thus the pin does not select the additional weight) and send this information to the
CPU board to notify that the check has been successful.
3.2.3. THE SIGNALS INVOLVED
The machine controls selection of the additional weight via the CPU board, the Bio servo board and
the solenoid as shown in the figure below:
The following signals come into play:
• Enable signal
This is the signal generated by the CPU (pin 17-1 on connector K4) to enable the solenoid. This
signal enters the Bio servo board (pins 13-1 on connector CN7), and is processed by the latter to
pilot the solenoid with the proper supply voltage.
The control logic states that when the enable signal is high (~ 4 V) the solenoid is powered (24
Vdc) and the pin does not select the additional weight, while when the signal is low (~ 0 V) the
solenoid is not powered (0 Vdc) and the pin selects the additional weight.
The figure below shows the switching of the enable signal to select the additional weight:
Bio servo board
Enable
CPU board
Status
S
Solenoid
17-1/K4 15-1/K4
13-1/CN7 15-1/CN7
5-6/CN3