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