Fault Message:

SLAT RESOLVER EXCITATION/SFCU#2/WRG

Fault Code:

2752258STD

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) 2 (A95)
• Right Slat Resolver (MT78)
• Left 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 2 with SFCU 1.

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

3. Check resistance value as follows:
   NOTE: Performing this resistance check will verify the interface wiring in addition to the resolver.

   Source	From	To	Expected Result	Result
   from Left Slat Resolver	A95AP1-2	A95AP1-1	166 to 170 ohms
   from Right Slat Resolver	A95AP1-14	A95AP1-13	166 to 170 ohms

   1. If resistance checks are out of tolerance, repair defective wiring as required and do close out.
   2. If resistance checks are within tolerance, continue with next step.

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

   Source	From	To	Expected Result	Result
   Left Slat Resolver	MT77J1-8	MT77J1-7	166 to 170 ohms
   Right Slat Resolver	MT78J1-8	MT78J1-7	166 to 170 ohms

   1. If resistance checks are 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.