STEP EXCITE: Service & maintenance manual - rev. 1.4
Page 3.7
- Voltage received from the brake board;
- RS-485 serial link to the brake board.
The board includes the following indicator LED:
LED name Color Description
D41 green
if ON the +12 Vdc supply from the AT driver
box, correctly reaches the board.
and a faston:
Name Description
J2 SHLD: denotes a ground node on the circuit board.
• SPLITTER / AMPLIFIER;
This device amplifies the signal received from the antenna, separating the FM radio channel
from the TV channel, which it sends to the tuner.
• TTL BOARD;
This is an RGB buffer board with six bits per color, which interfaces the video signals sent
from the CPU board to the LCD.
• LCD INVERTER
This device powers the LCD display segments. It receives DC power supplies (12 Vdc supply
and 3.3 Vdc enable signal) from the CPU board, and generates the AC voltage (380 Vac)
needed to power the LCD.
• TOUCH SCREEN INTERFACE BOARD
This is the board that controls the 4-wire resistive Touch Screen and interfaces the Touch
Screen to the CPU board.
• AUX INPUT BOARD
This board provides 3 RC connectors and one mini DIN connector for interfacing external
audio visual devices to the machine. An input on this board allows the external source to be
displayed on the LCD base band.
• HEADPHONE JACK
The machine display has two jacks for connecting headphones. The two jacks are connected in
parallel to a stereo output of the CPU board. In addition to the audio signals, the connector also
includes a sense signal for routing the output to either the headphones or external speakers, if
the latter are installed. The sense contact is NC and opens when the headphone jack is plugged
in.
3.1.2. CSAFE BOARD
This board makes available a communication port, on 1 externally accessible connector, which can
be used for interfacing compatible CSafe devices such as the CardioTheater readers. This connector
is situated on the back of the display.
These connectors can also be interfaced, using a special cable, to an external PC for programming
the FLASH EEPROM.
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