Fault Message:

SLAT RESOLVER EXCITATION/SFCU#1/WRG

Fault Code:

2751258STD

Associated CAS:

None

When one of the following conditions occurs:

• The output voltage is not within the permitted range
• The output current is not within the permitted range

• Slat Flap Control Unit (SFCU) 1 (A124)
• Slat resolver (MT77)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. On the EMS CDU, select CTRL function and SLAT/FLAP RESET.
   NOTE: Wait at least one minute after SFCU reset to allow self-test to run.

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

2. Swap SFCU 1 with SFCU 2.

   1. If system checks are good, replace SFCU 1 and do close out.
   2. If fault remains, continue with next step.

3. Check resistance value as follows:
   From left slat resolver:

   From	To	Resistance Value	Result
   A124AP1-2	A124AP1-1	166 to 170 ohms

   From right slat resolver:

   From	To	Resistance Value	Result
   A124AP1-14	A124AP1-13	166 to 170 ohms

   NOTE: Performing this resistance check will verify the interface wiring in addition to the resolver.

   1. If resistance is within tolerance, go to step 6.
   2. If resistance checks are out of tolerance, continue with next step.

4. Perform a resistance check of the resolver as follows:
   From left slat resolver:

   From	To	Resistance Value	Result
   MT77J1-2	MT77J1-1	166 to 170 ohms

   From right slat resolver:

   From	To	Resistance Value	Result
   MT78J1-2	MT78J1-1	166 to 170 ohms

   1. If resistance of the resolver is out of tolerance, go to step 6.
   2. If resistance of the resolver is within tolerance, continue with next step.

5. Perform wiring checks between the applicable SFCU and resolver.

   1. If wiring checks are not good, repair defective wiring as required and do close out.
   2. If wiring checks are good, continue with next step.

6. Replace resolver.
7. Do close out.