5 Check the earth bonding link
between the roll servo drive, and the main frame, for any signs of damage or corrosion (see fig. 3.32).
6 Check the earth bonding link
between the pitch servo drive, and the main frame, for any signs of dam-
age or corrosion (see fig. 3.33).
7 Check the earth bonding link
between the SAP management unit and main frame, for any signs of
damage or corrosion (see fig. 3.34).
 
 
8 If none of the above mentioned links are damaged or corroded finish this
 
task by performing step 17.
If any of the links are damaged or corroded continue with next step. 
9 Open the Utility Rack door, locate the
SAP Power Management Unit and remove the cover over the circuit breakers (see fig. 3.35). 
10  Behind the cover, switch off the circuit breaker labelled "INPUT POWER" 
and the circuit breaker labelled "24V PSU's". 
The three white indicators labelled "400V 3ุ INPUT" should remain ON, showing that the three-phase power input is present at the Power Management Unit. All other indicators should be OFF. Do not switch off the circuit breakers labelled "PITCH SERVO" and "ROLL SERVO". 
11 Via the user interface, remove the 400 V supply to the Power Management
Unit - check on the PMU that the 3 white indicators labelled "400V 3ุ
INPUT" are OFF.