Sinclair SDV 6 Service Manual page 96

8.1.27 C79 - Abnormal communication between the IDU main control board and adapter board
Error display
Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: operate
Error impact normally.
ODU of the same system: operate normally.
Error trigger If the main control board of an IDU has lost communication with the adapter board for 2 min
Error recovery Automatic recovery
Possible cause See the Troubleshooting section.
Troubleshooting
Digital display
Cause 1: The communication
cable between the main control
board of the IDU and the adapter
board has become disconnected
Cause 2: The communication
cable between the main control
board of the IDU and the adapter
board has become loose or is
C79
Cause 3: The IDU main control
Cause 4: The adapter board is
Panel, display box, and wired controller
or short circuited
connected to a wrong port
board is damaged
damaged
Display position
Replace the
communication cable
and properly connect
the cable
Properly connect the
cables and ensure
they are connected to
the right ports
Replace the main
control board of the
IDU
Replace the adapter
board
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