Xerox Phaser 7400 Service Manual

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Summary of Contents:

[Page 1] Xerox Phaser 7400

Phaser ® 7400 color printer Service Manual Book 1: Print Engine ...

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Phaser ® 7400 Color Printer Service Manual Book 1: Print Engine W arn i ng The following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that containe...

[Page 4] Xerox Phaser 7400

ii Phaser 7400 Color Printer Service Manual Copyright © 2005 Xerox Corporation. All Rights Reserved. Unpublished rights reserved under the copyright laws of the United States. Contents of this publication may not be reproduced in any form without ...

[Page 5] Xerox Phaser 7400

Safety iii Service Terms Manual Terms Various terms are used throughout this manual to either provide additional information on a specific topic or to warn of possible danger present during a procedure or action. Be aware of all symbols and terms w...

[Page 6] Xerox Phaser 7400

iv Phaser 7400 Color Printer Service Manual Symbols Marked on the Product DANGER high voltage. Protective ground (earth) symbol. Hot surface on or in the printer. Use caution to avoid personal injury. The surface is hot while the printer is running...

[Page 7] Xerox Phaser 7400

Safety v Power Safety Precautions Power Source For 115 VAC printers, do not apply more than 135 volts RMS between the supply conductors or between either supply conductor and ground. For 230 VAC printers, do not apply more than 254 volts RMS betwee...

[Page 8] Xerox Phaser 7400

vi Phaser 7400 Color Printer Service Manual Electrostatic Discharge (ESD) Precautions Some semiconductor components, and the respective sub-assemblies that contain them, are vulnerable to damage by Electrostatic discharge (ESD). These components in...

[Page 9] Xerox Phaser 7400

Safety vii Service Safety Summary General Guidelines For qualified service personnel only: Refer also to the preceding Power Safety Precautions. Avoid servicing alone: Do not perform internal service or adjustment of this product unless another pe...

[Page 10] Xerox Phaser 7400

viii Phaser 7400 Color Printer Service Manual Servicing Electrical Components Before starting any service procedure, switch off the printer power and unplug the power cord from the wall outlet. If you must service the printer with power applied, be...

[Page 11] Xerox Phaser 7400

Safety ix Regulatory Specifications Xerox has tested this product to electromagnetic emission and immunity standards. These standards are designed to mitigate interference caused or received by this product in a typical office environment. United S...

[Page 12] Xerox Phaser 7400

x Phaser 7400 Color Printer Service Manual European Union W arn i ng This is a class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures. Xerox Corporati...

[Page 13] Xerox Phaser 7400

Safety xi Manual Organization The Phaser 7400 Color Printer Service Manual is the primary document used for repairing, maintaining, and troubleshooting the printer. The manual is organized into two books. This volume, Book 1, focuses on the print e...

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xii Phaser 7400 Color Printer Service Manual Section 8 - Service Parts Disassembly: This section contains removal procedures for spare parts listed in the Parts List. A replacement procedure is included when necessary. Section 9 - Parts List: This...

[Page 15] Xerox Phaser 7400

Contents xiii Contents Service Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii Symbols Marked on the Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv Power Safety Prec...

[Page 16] Xerox Phaser 7400

xiv Phaser 7400 Color Printer Service Manual 2 Theory of Operation Phaser 7400 Operational Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Imaging Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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Contents xv Chassis Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46 Basket Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46 Waste Toner Recovery . . . . . . . . . ....

[Page 18] Xerox Phaser 7400

xvi Phaser 7400 Color Printer Service Manual Jam in Duplex Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26 Jam at Door E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27 Jam Under Ima...

[Page 19] Xerox Phaser 7400

Contents xvii Tray and Media Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-71 Clear Tray 1 (MPT) Riser Plate . . . . . . . . . . . . . . . . . . . . . . . . . . 3-71 Clear Tray [2][3][4][5][6] Riser Plate . . . ...

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xviii Phaser 7400 Color Printer Service Manual Unsupported Duplex Unit ROM . . . . . . . . . . . . . . . . . . . . . . . . 3-114 Unsupported Tray 2 ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-115 Unsupported Tray [3][4][5][6] ROM...

[Page 21] Xerox Phaser 7400

Contents xix Tray [3][4][5][6] Lift Motor Failure. . . . . . . . . . . . . . . . . . . . . . 3-160 Error in the Transfer Unit Belt. . . . . . . . . . . . . . . . . . . . . . . . . . 3-162 Duplex Unit Fan Failure. . . . . . . . . . . . . . . . . . . ....

[Page 22] Xerox Phaser 7400

xx Phaser 7400 Color Printer Service Manual Inoperable Printer Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11 Engine Power-Up Sequence (BIST) . . . . . . . . . . . . . . . . . . . . . . 4-12 Printer Continually Displays...

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Contents xxi 6 Adjustments and Calibrations Calibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 Color Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6...

[Page 24] Xerox Phaser 7400

xxii Phaser 7400 Color Printer Service Manual Print Engine Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12 Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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Contents xxiii Side Output Tray Detect Sensor . . . . . . . . . . . . . . . . . . . . . . . . . 8-73 Side Output Tray Stack Full Sensor. . . . . . . . . . . . . . . . . . . . . . . 8-75 Door E Detect Sensor . . . . . . . . . . . . . . . . . . . . . ....

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xxiv Phaser 7400 Color Printer Service Manual Paper Size Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-139 Motor Driver Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-141 Imaging Unit Sens...

[Page 27] Xerox Phaser 7400

Contents xxv Motor Driver Board (1/6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-31 Motor Driver Board (2/6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-32 Motor Driver Board (3/6) . . . . . . . . . . . . . . . . . ...

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xxvi Phaser 7400 Color Printer Service Manual ...

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1 Section General Information In this chapter... ■ Printer Introduction and Overview ■ Printer Configurations ■ Parts of the Printer ■ Printer Options ■ Specifications ...

[Page 30] Xerox Phaser 7400

1-2 Phaser 7400 Color Printer Service Manual Printer Introduction and Overview The Xerox Phaser 7400 Color Printer Service Manual is the primary document used to repair, maintain, and troubleshoot this printer. For manual updates, Service Bulletins...

[Page 31] Xerox Phaser 7400

General Information 1-3 Printer Configurations The Phaser 7400 Color Printer is available in five configurations. The main differences are standard memory, optional high-capacity feeders, duplexing (2-sided printing) capabilities, networking, and i...

[Page 32] Xerox Phaser 7400

1-4 Phaser 7400 Color Printer Service Manual Metered Printing Metered printing (PagePack), involves the combination of control software and specialized Toner Cartridges to meter printer activity for billing purposes. The Configuration page lists Me...

[Page 33] Xerox Phaser 7400

General Information 1-5 Parts of the Printer Front View 1. Top Cover latch 6. Paper Catcher 2. Control Panel 7. Top Output Tray 3. Tray 2 8. Door A 4. Front Door 9. Tray 1 (MPT) 5. Level Indicator 10.Door B 1 2 3 5 4 7 9 8 10 7400-001 6 ...

[Page 34] Xerox Phaser 7400

1-6 Phaser 7400 Color Printer Service Manual Rear View 1. AC Receptacle 6. USB Port 2. Door D 7. Ethernet Port 3. Door E 8. Serial Debug Port 4. Side Output Tray 9. Mode Select Port 5. Power Switch 10.Rear Cover 1 2 10 4 3 5 7400-002 7 6 8 9 ...

[Page 35] Xerox Phaser 7400

General Information 1-7 Control Panel The Control Panel contains one tricolor LED, a display window, and six function buttons. These buttons navigate the menu system shown on the display, perform various functions, and select operational modes for ...

[Page 36] Xerox Phaser 7400

1-8 Phaser 7400 Color Printer Service Manual Image Processor Board Transfer the following components, if installed, to the new board when replacing the Image Processor Board. Hard Drive Memory (RAM) Configuration Card NVRAM s7400-352 ...

[Page 37] Xerox Phaser 7400

General Information 1-9 Printer Options Phaser 7400 Color Printer options include: ■ 20 GB Hard Drive ■ Additional Memory ■ 550-Sheet Feeder (LTA) ■ 1650-Sheet Feeder (HCF) ■ Duplex Unit ■ 1,000-Sheet Finisher (with hole punch, staple, sa...

[Page 38] Xerox Phaser 7400

1-10 Phaser 7400 Color Printer Service Manual Configuration Card A Configuration Card identifies the printer configuration, stores shadowed non- CRUM consumable data, consumable life counts, and network configuration parameters. 550-Sheet Feeder The...

[Page 39] Xerox Phaser 7400

General Information 1-11 Duplex Unit The Duplex Unit adds two-sided printing. The Duplex Unit is inserted into the printer’s left side just below the Side Output Tray. Electrical connection is made by an interface connector located inside the Dup...

[Page 40] Xerox Phaser 7400

1-12 Phaser 7400 Color Printer Service Manual Maintenance Items A maintenance item is a printer part or assembly that has a limited life, and requires periodic replacement. Consumables Consumables consist of the four toner cartridges used in the p...

[Page 41] Xerox Phaser 7400

General Information 1-13 Specifications Memory Specifications Consumable Life Specifications Internal counters track Consumables and Maintenance Items life usage. The Image Processor Board monitors these counters in order to display the near end-of-...

[Page 42] Xerox Phaser 7400

1-14 Phaser 7400 Color Printer Service Manual Electrical Specifications Physical Dimensions and Clearances Characteristic Specification Primary line voltages 110-127 V Printer - (90 - 135 V) 13 amp circuit 220-240 V Printer - (198 - 254 V) 7-8 amp...

[Page 43] Xerox Phaser 7400

General Information 1-15 Minimum Clearances 167.4 cm (66 in.) 61.0 cm (24 in.) 127.5 cm (50 in.) 50.8 cm (20 in.) 50.8 cm (20 in.) 50.8 cm (20 in.) 15.2 cm (6 in.) 61.0 cm (24 in.) 266.4 cm (104.9 in.) 68.5 cm (27 in.) 127.5 cm (50 in.) 15.2 cm...

[Page 44] Xerox Phaser 7400

1-16 Phaser 7400 Color Printer Service Manual Functional Specifications First Print Output Time First Print Output Time (FPOT) is defined as a time from receipt of the print command in Ready mode until the first page sourced from either Tray 1 or Tr...

[Page 45] Xerox Phaser 7400

General Information 1-17 Image Specifications Environmental Specifications Characteristic Specification Maximum Print Area Guaranteed Print Area Minimum margins = 5 mm (0.2 in.) on all sides Maximum paper size = 328 mm x 1200 mm (12.9 in.x 47.25 in....

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1-18 Phaser 7400 Color Printer Service Manual Media and Tray Specifications The following table lists the paper sizes and weights supported in the printer trays. Media and Tray Specifications Specification Trays Supported Media Sizes Paper Type Let...

[Page 47] Xerox Phaser 7400

General Information 1-19 Note For duplex configured printers, auto-duplex operation is available through all trays. Refer to the Paper Tips page for information on which paper types can be used for 2-sided printing. For more details about supported...

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1-20 Phaser 7400 Color Printer Service Manual ...

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2 Section Theory of Operation In this chapter... ■ Overview ■ Printer Controls ■ Paper Path of the Printer ■ Major Assemblies and Functions ...

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2-2 Phaser 7400 Color Printer Service Manual Phaser 7400 Operational Overview The Phaser 7400 Color Printer is a full-color LED printer using electrophotographic recording principals to place a full color image onto the print media. The system, as i...

[Page 51] Xerox Phaser 7400

Theory of Operation 2-3 Imaging Unit The function of each Imaging Unit component is listed in the following table. Imaging Unit Components Component Function Drum The Drum is an aluminum cylinder coated with a layer of photo- conductive material tha...

[Page 52] Xerox Phaser 7400

2-4 Phaser 7400 Color Printer Service Manual LED Heads The LED Heads receive signals from the Engine Control Board and scan the surface of the four Imaging Unit drums to create a latent image. The resolution is either 600 dpi or 1200 dpi and is de...

[Page 53] Xerox Phaser 7400

Theory of Operation 2-5 Fuser Life Expectancy The life expectancy is 100,000 Letter/A4 size pages. Several factors reduce Fuser life: ■ Paper use larger than letter size ■ Printing on heavy media ■ Printing short-edge feed ■ Printing on trans...

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2-6 Phaser 7400 Color Printer Service Manual Print Process Summary The block diagram illustrates the steps involved in producing a full-color print. The (numbers) indicate the corresponding description provided in the Print Process Summary that fol...

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Theory of Operation 2-7 1. Charging: The charge roller (RTC) is negatively charged by the High-Voltage Power Supply (HVPS) and is kept in contact with the drum surface to provide a uniform negative charge on the drum as it rotates at a constant spe...

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2-8 Phaser 7400 Color Printer Service Manual ■ The toner is attracted to the latent image on the surface of the drum at the point where the drum is in contact with the developing roller. 4. Transfer: The Transfer Roller, made of a conductive spon...

[Page 57] Xerox Phaser 7400

Theory of Operation 2-9 5. Fusing: The Fuser uses a combination of heat and pressure to bond the toner image to the paper. 6. Transfer Unit Cleaning: Toner remaining on the Transfer Unit belt is removed by a cleaning blade and transported by Auger ...

[Page 58] Xerox Phaser 7400

2-10 Phaser 7400 Color Printer Service Manual Printer Controls Print-Quality Modes There are four print-quality modes: Color Registration Control The printer uses a single-pass, quad system where each color (Yellow, Magenta, Cyan, and Black) has its...

[Page 59] Xerox Phaser 7400

Theory of Operation 2-11 The Color Registration Sensors are used to measure the amount of misalignment based on the position of the color patches in relation to the black toner patch that precedes them. According to this measurement, the printer de...

[Page 60] Xerox Phaser 7400

2-12 Phaser 7400 Color Printer Service Manual To avoid a positional shift between the different color images, the color registration control generates an alignment pattern (a series of primary color toner patches on either side of the Transfer Unit...

[Page 61] Xerox Phaser 7400

Theory of Operation 2-13 Automatic Density Control The printer uses a series of test patches printed down the center of the Transfer Unit belt to monitor the density of toner being supplied to the Imaging Unit drums. The test patches consist of a g...

[Page 62] Xerox Phaser 7400

2-14 Phaser 7400 Color Printer Service Manual Image Transfer Control The printer monitors environmental conditions with the temperature and humidity sensors. The printer computes the optimal transfer voltage under the current environmental conditio...

[Page 63] Xerox Phaser 7400

Theory of Operation 2-15 Sensors The printer contains sensors of various types that perform a variety of functions. One group of sensors track the progress of the paper along the paper path, and detect if a paper jam occurs. Other sensors detect th...

[Page 64] Xerox Phaser 7400

2-16 Phaser 7400 Color Printer Service Manual Microswitches Microswitches are used primarily as paper size sensors and cover or door interlocks. They are in a normally open state, and close when actuated. A bank of microswitches is used to detect p...

[Page 65] Xerox Phaser 7400

Theory of Operation 2-17 Sensors in the Printer The following illustrations identifies the location of each sensor. Toner Supply YK Sensor ADC Sensor Imaging Unit Up/Down Sensor Drum Phase Sensors Low Toner Sensors Color Registration Sensors Wast...

[Page 66] Xerox Phaser 7400

2-18 Phaser 7400 Color Printer Service Manual The diagram below identifies the paper feed sensors. Top Output Tray Stack Full Sensor Job Offset Home Position Sensor Side Output Tray Stack Full Sensor Tray 2 Low Paper Sensor Tray 2 Level Sensor Regis...

[Page 67] Xerox Phaser 7400

Theory of Operation 2-19 Sensor Functions The following table lists the function of each sensor. Sensor Functions Sensor Function Sensor State Top Output Tray Stack Full Sensor Detects the Top Output Tray stack height. On: not full Off: full Side O...

[Page 68] Xerox Phaser 7400

2-20 Phaser 7400 Color Printer Service Manual Tray 1 (MPT) Home Position Sensor Detects the position of the Tray 1 (MPT) Turn Clutch for pick operations. On: not home Off: home Transfer Unit Belt Rotation Sensor Used to count Transfer Unit belt re...

[Page 69] Xerox Phaser 7400

Theory of Operation 2-21 Paper Level Detection As paper is fed from the tray, the paper level drops. When the paper level reaches a certain point, an actuator unblocks the Level Sensor signaling the control logic to stop paper feed and raise the tr...

[Page 70] Xerox Phaser 7400

2-22 Phaser 7400 Color Printer Service Manual Paper Size Detection Trays 2 through 6 automatically sense the standard size media loaded in the printer by using the Paper Size Switches mounted on the frame at the back of the tray opening. When paper...

[Page 71] Xerox Phaser 7400

Theory of Operation 2-23 Jam Detection The printer checks for a paper jam when the printer is powered on and during printing. When a paper jam occurs, printing immediately stops. Below is a diagram of jam locations within the printer. ■ Media Jam...

[Page 72] Xerox Phaser 7400

2-24 Phaser 7400 Color Printer Service Manual Interlock Detection If the Top Cover, Door A is opened, or the Waste Toner Reservoir is removed, an Interlock Switch is opened cutting the +24V source to the HVPS. At the same time, the CPU receives a s...

[Page 73] Xerox Phaser 7400

Theory of Operation 2-25 Toner Full State When the Imaging Unit is at a toner full state, the Agitation Bar target remains at its maximum height for a period exceeding .85 seconds. Periods in excess of .85 seconds indicate a toner full state. Perio...

[Page 74] Xerox Phaser 7400

2-26 Phaser 7400 Color Printer Service Manual Toner Supply If after checking the Low Toner Sensor three times, the state remains low, then the toner supply agitator and toner cartridge agitation spring rotate, supplying additional toner to the Imag...

[Page 75] Xerox Phaser 7400

Theory of Operation 2-27 Input Paper Path Paper is transported through the printer along the paper path shown below. Paper Fed from Tray 1 (MPT) 1. Paper loaded in the tray is detected by the Tray 1 (MPT) No Paper Sensor. 2. The Registration Motor r...

[Page 76] Xerox Phaser 7400

2-28 Phaser 7400 Color Printer Service Manual 4. The leading edge of the sheet is detected by the Feed-Out Sensor #1. Depending on the size of the sheet, the Feed Motor continues to drive the sheet until the leading edge reaches the Registration Se...

[Page 77] Xerox Phaser 7400

Theory of Operation 2-29 The Tray 1 (MPT) Lift Plate should remain down (home position) when opened. It should only lift when media is sensed. However, the Tray 1 (MPT) Lift Plate is spring loaded. These springs are compressed under the Lift Plate ...

[Page 78] Xerox Phaser 7400

2-30 Phaser 7400 Color Printer Service Manual Paper Fed from Tray 2 1. Paper loaded in the tray is detected by the Tray 2 Paper Size Switch. 2. The Tray 2 Lift Motor rotates lifting the sheet to the pre-feed position detected by the Tray 2 Level Sen...

[Page 79] Xerox Phaser 7400

Theory of Operation 2-31 Paper Registration Roller #1 Transfer Unit Entrance Sensor Registration Sensor #1 Registration Sensor #2 Registration Clutch #1 Registration Clutch #2 Transport Rollers Registration Roller #2 Pick Roller Feed Roller Feed-O...

[Page 80] Xerox Phaser 7400

2-32 Phaser 7400 Color Printer Service Manual ■ No Paper Sensor Detects presence or absence of print media in the tray based on the position of the Actuator. ■ Level Sensor Detects presence of media in the tray based on the position of the Act...

[Page 81] Xerox Phaser 7400

Theory of Operation 2-33 Paper Fed from Optional Trays The following describes the paper path as it is fed from the optional Tray 3. Trays 4 through 6 function in the same manner. Media moves along the paper path as follows: 1. Paper loaded in the t...

[Page 82] Xerox Phaser 7400

2-34 Phaser 7400 Color Printer Service Manual The paper supply and path for the optional trays involve these components: ■ Level Sensor Detects presence of media in the tray based on the position of the Actuator. ■ Paper Size Switches Detects m...

[Page 83] Xerox Phaser 7400

Theory of Operation 2-35 ■ Registration Motor This motor drives the Registration Rollers to pull media from the tray into the paper path. ■ Registration Clutch This clutch transfers Registration Motor drive to the Registration Roller. ■ Reg...

[Page 84] Xerox Phaser 7400

2-36 Phaser 7400 Color Printer Service Manual ■ Duplex Entrance Sensor Detects the leading edge of the media and signals the Duplex Motor to begin rotation in the forward direction. ■ Duplex Gate Solenoid Activates the Duplex Gate directing me...

[Page 85] Xerox Phaser 7400

Theory of Operation 2-37 Output Paper Path The Phaser 7400 paper path for paper exiting the Fuser are: ■ Directed by the Exit Gate to the Top Output Tray on the Top Cover (facedown). ■ Directed by the Exit Gate to the Side Output Tray or Finisher...

[Page 86] Xerox Phaser 7400

2-38 Phaser 7400 Color Printer Service Manual Top Output Tray The Top Output Tray is a facedown, 500-sheet tray located on the printer’s Top Cover. The tray receives paper from the Exit Assembly which includes a Job Offset Assembly for offset out...

[Page 87] Xerox Phaser 7400

Theory of Operation 2-39 Drive Assemblies The following illustration shows the location for all the printer’s motors. Imaging Unit Drive Motors The Imaging Unit Motors drive the Imaging Unit drums, toner Agitation Bars and Agitation Gears. Imaging...

[Page 88] Xerox Phaser 7400

2-40 Phaser 7400 Color Printer Service Manual C-ID Unit M-ID Unit Y-ID Unit K-ID Unit C-ID Unit M-ID Unit Y-ID Unit K-ID Unit C-ID Motor (CCW) C-ID Motor (CW) Lift Uplink Lift Uplink ID Unit Operations During Color Printing ID Unit Operations Durin...

[Page 89] Xerox Phaser 7400

Theory of Operation 2-41 Imaging Unit Drive The four Imaging Unit Motors supply the drive to the Imaging Unit drum and Agitation Bar and Gear as shown in the following figure. Transfer Unit Motor The Transfer Unit motor turns clockwise driving the T...

[Page 90] Xerox Phaser 7400

2-42 Phaser 7400 Color Printer Service Manual Transfer Unit Drive The Transfer Unit Motor supplies the drive to the transfer belt as shown in the following figure. s7400-360 Transfer Unit Motor Transfer Unit Motor Transfer Unit Gear Transfer Unit Be...

[Page 91] Xerox Phaser 7400

Theory of Operation 2-43 Fuser Motor The Fuser Motor drives the Fuser Heat and Pressure Rollers, as well as the Exit Rollers. This is shown in the following figure. Fuser Motor Heat Roller Pressure Roller Exit Rollers Fuser s7400-392 ...

[Page 92] Xerox Phaser 7400

2-44 Phaser 7400 Color Printer Service Manual Toner Dispense Motors The CM and YK Toner Dispense Motors are mounted above the Imaging Unit Motors and drive the Toner Cartridge Supply Augers and Agitation Springs to deliver toner to the Imaging Unit...

[Page 93] Xerox Phaser 7400

Theory of Operation 2-45 Duplex Drive Motors Two motors are used to capture and transport paper in the Duplex Unit. Duplex Motor A drives the Entrance Roller CCW to capture paper, then CW to drive the media into the Transport Rollers. Motor B uses ...

[Page 94] Xerox Phaser 7400

2-46 Phaser 7400 Color Printer Service Manual Chassis Assemblies Basket Assembly The Basket Assembly allows all four Imaging Units to be raised from the Transfer Unit to facilitate jam clearance. A latch at the front of the Basket Assembly releases ...

[Page 95] Xerox Phaser 7400

Theory of Operation 2-47 Waste Toner Recovery Waste toner recovery moves the toner collected from the Imaging Unit drums and Transfer Unit belt to the Waste Toner Reservoir located at the front of the printer. Driven by the Waste Toner Motor, separ...

[Page 96] Xerox Phaser 7400

2-48 Phaser 7400 Color Printer Service Manual Registration Assembly Shown in the following figure are the components associated with the Registration Assembly. ■ Tray 1 (MPT) Home Position Sensor Detects the position of the Feed drive. ■ Regis...

[Page 97] Xerox Phaser 7400

Theory of Operation 2-49 Exit Assembly The Exit Assembly uses rollers, solenoids, sensors, and diversion gates to handle media exiting the Fuser. Exit Assembly components include: ■ Exit Gate The Exit Gate switches the paper path. When the Exit G...

[Page 98] Xerox Phaser 7400

2-50 Phaser 7400 Color Printer Service Manual ■ Offset Home Position Sensor The Offset Home Position Sensor detects the roller position. ■ Job Offset Trailing Edge Sensor Detects the trailing edge of the media as it leaves the Exit Assembly. �...

[Page 99] Xerox Phaser 7400

Theory of Operation 2-51 Job Offset Assembly ■ Job Offset Motor The Offset Motor acting through the Offset Gear shifts the media forward or backward providing offset capability. The flow diagram shows the components involved in the offset proces...

[Page 100] Xerox Phaser 7400

2-52 Phaser 7400 Color Printer Service Manual Trays Standard input trays include the 100-sheet, multi-purpose Tray 1 (MPT) and one 550-sheet universal tray. Standard output trays include a 500-Sheet facedown Top Output Tray with offset capability,...