Troubleshooting
6-38 Manual # 42-02-1P28 A3
On Board Diagnostics
Two LEDs provide diagnostic information: The ON LED (green) and the FLT LED (red).
ON LED
The ON LED reflects power/communications status.
• ON: Serial hall call bus to Group/Car OK
• OFF: Board is not receiving power or has no software loaded.
• Blinking: Communications error - more than ten seconds have passed without a message
from the dispatcher.
(FLT) FAULT LED
The FLT LED reflects the status of the analog outputs.
• ON steady: Internal fault -
•Replace board if problem persists
• OFF: No Errors detected.
• Blinking: Output overload or disconnection. Pressing the Reset button on the SC-3HN
board will clear a blinking Fault LED.
• Overload: Excessive current draw. Resets when current draw is corrected and call but-
ton is pressed again.
• Not Connected: The output is on (button pressed) but nothing is connected to the UL-
or DL- output. Resets when the lamp is connected and the call button is pressed again.
• Output Shorted: If short is very quick, the LED will flash. Pressing the call button for a
few moments will cause the board to reboot. Resets when the short is removed and the
call button is pressed again.
INVENTORY
When all hall calls are installed and functioning properly, the system allows you to save them
into memory (inventory them). In the future, when looking for a burned out LED or a stuck
switch, the same UI screen will automatically test all inventoried hall calls for you. See Hall Bus
Inventory on page 5-40.
Please refer to the Motion Group Manual, 42-02-G006, for configuration information relating
to group hall calls.
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