HP 4 C2001A, C2021A, 5n C3952A, 5 C3916A, 5m C3917A, 4 plus C2037A manual Parts and Diagrams, Duplexer

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