3.2 Screws used in the printer ……………………………………… 3-23.3 Cover ……………………………………………………………… 3-33.3.1 Left/Right cover ……………………………………………… 3-33.3.2 Rear bracket ………………………………………………… 3-33.3.3 Cover-open ………………………………………………… 3-43.3.4 Top/Front cover ……………………………………………… 3-43.4 Main PBA ………………………………………………………… 3-53.5 SMPS/HVPS board ……………………………………………… 3-63.6 Fuser unit ………………………………………………………… 3-73.7 LSU ………………………………………………………………… 3-83.8 Drive unit ………………………………………………………… 3-93.9 Step motor ………………………………………………………… 3-103.10 Pick up roller …………………………………………………… 3-114.1 Alignment and Adjustments ……………………………………… 4-14.1.1 Control Panel ………………………………………………… 4-14.1.2 Understanding the LEDs …………………………………… 4-24.1.3 JAM Removal ……………………………………………… 4-34.1.4 Printing a report ……………………………………………… 4-54.1.5 Periodic Defective Image …………………………………… 4-84.1.6 Firmware upgrade …………………………………………… 4-94.1.7 Using the smart panel program …………………………… 4-104.2 Troubleshooting…………………………………………………… 4-124.2.1 Procedure of Checking the Symptoms …………………… 4-124.2.2 Bad discharge ……………………………………………… 4-154.2.3 Malfunction …………………………………………………… 4-194.2.4 Bad image …………………………………………………… 4-24chapter 4 Alignment and TroubleshootingContents