PC Board Quick References
6-57
Troubleshooting
• I/O LED is Blinking:
• Low impedance or largely reactive load (in-rush current surge >3A or steady state
>300mA)
• Output connected to line source with no series load
• Input board addressed as output board (switches are only checked on boot up; reset
processor after any switch change)
• JP-18 not installed
• 1 bus or 2 bus not connected at J3
•1 bus floating at J3
• Output transistor damaged
• Car or Hall Call Fixture Glowing in OFF State:
• I/O jumpers set to Input mode (pull down)
• JP-18 set in B mode
• Fixture voltages not connected to PS1 and PS2 (no voltage provided to pull up)
• External resistors or RT-20 board not connected properly
• Duplex Operation: 120VAC on controller 1 out of phase with controller 2.
• CPU ON Light Extinguished:
• CAN/Power cable not connected
• No software on board (repeat boot loading)
• Button press not seen by I/O call board:
• Threshold recognition SW9 set for higher voltage
• Voltage greater than 1VDC at I/O terminal during button press
• Software version incorrect. Ensure HC-UIO-2 is running v21.8 or higher
• Pull up voltage low (less than 20VAC, less than 20 VDC)
• I/O LED ON (when it should not be)
• PS1 or PS2 terminal not connected (or floating)
• Output transistor damaged
• Duplex Operation: -2 board connected to Rev 2 or 4 board and DIP switch 9 not set.
(Set switch 9 on -2 board.)
• Does not communicate with controller / does not bootload
• Ensure correct Board ID is used
• Verify CAN termination jumpers (JP1), refer to job prints
• Ensure baud rate switches (SW7 and SW8) are set correctly
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