3.3.7 Installing the logic board coverIf the logic board cover is installed incorrectly, the logic board and paper feed rollerswill be obstructed and the ASF motor may go out of sync.Note that prong A is prone to engage incorrectly. Make sure that it fits in correctly.3.3.8 Handling the purge unitNote the following with regard to the purge unit:(1) Grease soiling the bladeDue to the blade's height, the carriage guide shaft may touch it when the shaft isremoved or installed. Grease may soil the blade as a result.You must not allow any grease or oily substance to adhere to the blade.Part 2: Troubleshooting S63002-18AFigure 2-7 Installing the Logic Board CoverBladeFigure 2-8 Handling the Purge Unit