STEP EXCITE: Service & maintenance manual - rev. 1.4
Page 3.2
3.1.1. DISPLAY BOARDS
3.1.1.1. 500i and 500i SP versions
The display comprises the following circuit boards:
• 386 BOARD
This is the circuit board which comprises the CPU, a 386 microprocessor, its logic circuits and
a FLASH EPROM containing the operating program for the machine.
• DISPLAY BOARD
This is the heart of the display: this board acts as the interconnection hub for all the
components of the display, and serves as the point of connection with the electrical box. In fact
it:
> receives commands of the machine program from the 386 Board;
> sends to the 386 Board the signals received from:
- Keyboard;
- Cardio receiver;
- TGS reader;
- CSafe Board;
>
distributes the voltages received from the Brake board to the display;
> exchanges, via the RS-485 serial link to the Brake board, the commands for controlling the
brake;
> controls the LEDs and the 7-segment displays which provide feedback about the exercise
session.
The board includes the following indicator LEDs:
LED name Color Description
DL1 green
if ON the +12 Vdc power supply from the
Brake board correctly reaches the board.
DL2 yellow
if ON the +5 Vdc power supply from the
Brake board correctly reaches the board.
DL3 green
if ON the +5 Vdc stabilized digital power
supply is correctly generated.
and 2 jumpers:
Jumper Name Setting Description
JP1 open if closed resets the board.
JP2 closed
if closed allows the backup battery to keep
the system clock active.
To Next Page
Loading...
