Sinclair SDV 6 Service Manual page 69

8.1.8 A81 - Self-check fault
Error display
Error impact
Error trigger
Error recovery
Possible cause
Troubleshooting
66
Digital display
Faulty IDU: stops. Other IDUs of the same system:
 IDUs that share the same MS with the faulty IDU will stop operating, while other IDUs remain
in operation.
IDUs that share the same MS with the faulty IDU display the code "A81" (SDV5 plat. IDU

displays the code "U4"). Meaning of the code: MS self-check fault); IDUs that are connected
to other MSs work properly.
ODU of the same system:
 stops.
 SDV6 plat. ODU displays the code "A81", and SDV5 plat. ODU displays the code "U4".
Meaning of the code: MS self-check fault)
The MS self-check fault lasts for at least 10 min
The fault is cleared if one of the following conditions is met:
 Automatic recovery 30 min after the MS fault is cleared
 Power on again
 A fault may occur during the MS self-check process.
Panel, display box, and wired controller
A81/A82
Open the MS electric
control box connected to
the IDU and check the
error code displayed on
the digital display of MS
electric control box
Follow the instructions of
the MS Maintenance
Guide
Display position