Error code: 1223
<- BackEncoder test error
Some abnormalities were found in the encoder test result.
Check the PF scale (SCALE, PF) for any dirt, and clean it if any dirt is observed. Check the PF encoder (BOARD ASSY., ENCODER, PF) for incorrect attachment, scratch, dirt, and fix any abnormality. Replace the PF encoder (BOARD ASSY., ENCODER, PF).