What was found
AFTER ENG 1 START ECAM AUTO FLT YAW DAMPER 1 FAULT. COMPUTER RESET WAS PERFORMED UNSUCCESSFUL. IAW AMM 22-91-00-710-001-A AFS GND SCAN WAS PERFORMED UNSUCCESSFUL. IAW MEL 22-63-01-1 CAT C, THIS ITEM WAS DEFERRED TO DMI 495. IAW AMM 27- 60-00-040-001 THE YAW DAMPER SERVO ACT 1 DEACTIVATION WAS ACCOMPLISHED. IAW TSM 22-63-00-810-201A LOSS OF THE YAW DAMPER FUNCTION ON THE FAC 1 OPERATIONAL TEST OF THE YAW DAMPER FUNCTION & GND SCANNING OF THE AFS WERE PERFORMED & SHOWED MX MSG FAC1 YD ACTR1 3CC1. THE CHECK OF THE IMPEDANCE BETWEEN THE PIN AC 4, PIN AC 6, PIN AF 4 & THE PIN AF 6 OF THE FAC 1 RACK CONNECTOR WERE CHECKED & SHOWED 21 OHMS. IF THE IMPEDANCE IS NOT CORRECT REPLACE THE SERVO ACTR YAW DAMPER 3CC1.