Drum Rotation Functional Check . . . . . . . . . . . 7-50 High Voltage Power Supply Assembly . . . . . . . . 7-51 Interface Troubleshooting . . . . . . . . . . . . . . . . . 7-52 Communications Check . . . . . . . . . . . . . . . . 7-52 Test Message . . . . . . . . . . . . . . . . . . . . . . 7-52 AUTOEXEC.BAT Standard Configurations . . . . . 7-53 Parallel DOS Commands . . . . . . . . . . . . . . . 7-53 Serial MS-DOS Commands . . . . . . . . . . . . . . 7-53 Communications Checks . . . . . . . . . . . . . . . . 7-54 MIO Troubleshooting . . . . . . . . . . . . . . . . . . . 7-56 Troubleshooting Hints . . . . . . . . . . . . . . . . . 7-56 Explanation of Self Test Printout . . . . . . . . . .
. 7-57 Troubleshooting Aids . . . . . . . . . . . . . . . . . . . 7-59 Component Locations . . . . . . . . . . . . . . . . . . 7-59 Repetitive Defect Template . . . . . . . . . . . . . . 7-67 Voltage Test Points . . . . . . . . . . . . . . . . . . 7-69 Measuring the DC Voltage Levels . . . . . . . . . . . 7-69 8 Parts and Diagrams How To Use the Parts Lists . . . . . . . . . . . . . . . . . 8-1 Parts Lists and Illustrations . . . . . . . . . . . . . . . 8-2 Accessory Parts . . . . . . . . . . . . . . . . . . . . . . 8-33 SIMM Memory . . . . . . . . . . . . . . . . . . . . . 8-38 Miscellaneous Parts and Accessories . . . . . . . . . 8-39 Parts List . . . . . . . . . . . . . . . . . . . . . .
. . . . 8-40 A Duplexer Functional Overview . . . . . . . . . . . . . . . . . . A-2 Duplex Printing . . . . . . . . . . . . . . . . . . . . . A-3 Switchback Assembly . . . . . . . . . . . . . . . . . . A-3 Holding Tray . . . . . . . . . . . . . . . . . . . . . . A-3 Electrical Overview . . . . . . . . . . . . . . . . . . . A-5 Installing the Optional Duplexer . . . . . . . . . . . . . A-6 Removal and Replacement . . . . . . . . . . . . . . . . A-8 Required Tools . . . . . . . . . . . . . . . . . . . . . A-8 Removing the Covers . . . . . . . . . . . . . . . . . . A-9 Removing the Switchback Covers . . . . . . . . . . . A-9 Removing the Side Cover on Power Side . . . . . . .
A-10 Removing the Side Cover on Gear Side . . . . . . . . A-11 Removing the Back Cover . . . . . . . . . . . . . . . A-13 Removing the Front Cover . . . . . . . . . . . . . . . A-13 Removing Internal Duplexer Components . . . . . . . A-14 Removing the Fan/Motor/Solenoid/Sensor . . . . . . . A-14 Removing the Switchback Paper Guide . . . . . . . . A-15 Contents-7