HP 1220c Support Guide - Page 119

START Connections to Main Logic Harness Assembly OK? Yes Service Station moves smoothly? Yes Carriage moves out of home position? Yes Trough-1 Assembly rollers rotate? Yes OOPS flag moves freely? Yes END Check connection between Main No Logic Harness and Logic PCA Assemblies. No Service Station or Logic PCA faulty. Carriage Motor, No Logic PCA, or Encoder Strip faulty. No Gears on Drive Roller loose? Line Feed Motor, No Logic PCA, or Left Support Assembly faulty. Replace one at a time to isolate the cause. No Reseat OOPS flag.