Xerox 8200, 860, 850, 840 Service Manual

Phaser

Color Printer

Service

Manual

With Phaser® 8200 Color Printer Addendum

840/850/860

PHASER® 840/850/860 NETWORK COLOR PRINTER

Service Manual

with the Phaser 8200 Color Printer Addendum

Warning The following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.

This printing: April 2002 071-0723-00

Copyright © 2002, 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 Unpublished rights reserved under the copyright laws of the United States.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 permission of Xerox Corporation.

Copyright protection claimed includes all forms of matters of copyrightable materials and information now allowed by statutory or judicial law or hereinafter granted, including without limitation, material generated from the software programs which are displayed on the screen such as styles, templates, icons, screen displays, looks, etc.

XEROX Each Other

, The Document Company®, the stylized X®, CentreWare®, ColorStix®, DocuPrint®, Made For

, Phaser®, PhaserShare®, and the TekColor® icon are registered trademarks of Xerox Corporation. infoSMART™, PhaserLink™, PhaserPort™, PhaserPrint™, PhaserSMART™, PhaserSym™, PhaserTools™, and the TekColor™ name are trademarks of Xerox Corporation. Total Satisfaction Services

(formerly TekColor CareSM and RealSuppportSM) is a service mark of Xerox

Corporation.

, Acrobat® Reader®, and PostScript® are registered trademarks of Adobe Systems Incorporated.

Adobe

Apple

, LaserWriter®, LocalTalk®, Macintosh®, Mac® OS, and AppleTalk®are registered trademarks of

Apple Computer Incorporated.

and HP-GL® are registered trademarks of Hewlett-Packard Corporation.

PCL

MS-DOS

Novell

Sun

and Windows® are registered trademarks of Microsoft Corporation.

and NetWare® are registered trademarks of Novell, Incorporated.

and Sun Microsystems® are registered trademarks of Sun Microsystems, Incorporated. SPARC® is a registered trademark of SPARC International, Incorporated. SPARCstation™ is a trademark of SPARC International, Incorporated, licensed exclusively to Sun Microsystems, Incorporated.

UNIX

is a registered trademark in the US and other countries, licensed exclusively through X/Open

Company Limited.

This product includes an implementation of LZW licensed under U.S. Patent 4,558,302.

Other marks are trademarks or registered trademarks of the companies with which they are associated.

PANTONE

Colors generated by the Phaser 840 / 850 / 860 / 8200 Color Printers are four- and/or three-color process simulations and may not match PANTONE-identified solid color standards. Use current PANTONE Color Reference Manuals for accurate colors. PANTONE Color simulations are only obtainable on this product when driven by qualified Pantone-licensed software packages. Contact Pantone, Inc. for a current list of qualified licensees.

TE/MP

ck/mp

User safety summary

Terms in manual

CAUTION Conditions that can result in damage to the product.

WARNING Conditions that can result in personal injury or loss of life.

Power source: For 110 VAC printers, do not apply more than 130 volts RMS between

the supply conductors or between either supply conductor and ground. Use only the specified power cord and connector. For 220 VAC printers, do not apply more than 250 volts RMS between the supply conductors or between either supply conductor and ground. Use only the specified power cord and connector. Refer to a qualified service technician for changes to the cord or connector.

Operation of product: Avoid electric shock by contacting a qualified service

technician to replace fuses inside the product. Do not operate without the covers and panels properly installed. Do not operate in an atmosphere of explosive gases.

WARNING Turning the power off using the On/Off switch does not de-energize

the printer. You must remove the power cord to disconnect the printer from the mains. Keep the power cord accessible for removal in case of an emergency.

Safety instructions: Read all installation instructions carefully before you plug the

product into a power source.

Terms on product

CAUTION A personal injury hazard exists that may not be apparent. For

example, a panel may cover the hazardous area. Also applies to a hazard to property including the product itself.

DANGER A personal injury hazard exists in the area where you see the sign.

Care of product: Disconnect the power plug by pulling the plug, not the cord.

Disconnect the power plug if the power cord or plug is frayed or otherwise damaged, if you spill anything into the case, if product is exposed to any excess moisture, if product is dropped or damaged, if you suspect that the product needs servicing or repair, and whenever you clean the product.

Ground the product: Plug the three-wire power cord (with grounding prong) into

grounded AC outlets only. If necessary, contact a licensed electrician to install a properly grounded outlet.

Symbols as marked on product:

DANGER high voltage:

Protective ground (earth) terminal:

Use caution. Refer to the manual(s) for information:

WAR NIN G : If the product loses the ground connection, usage of knobs and controls

(and other conductive parts) can cause an electrical shock. Electrical product may be hazardous if misused.

Service safety summary

For qualified service personnel only: Refer also to the preceding Users Safety

Summary.

Do not service alone: Do not perform internal service or adjustment of this product

unless another person capable of rendering first aid or resuscitation is present.

Use care when servicing with power on: Dangerous voltages may exist at

several points in this product. To avoid personal injury, do not touch exposed connections and components while power is on.

Disconnect power before removing the power supply shield, soldering, or replacing components.

Do not wear jewelry: Remove jewelry prior to servicing. Rings, necklaces, and

other metallic objects could come into contact with dangerous voltages and currents.

Power source: This product is intended to operate from a power source that will not

apply more than 250 volts rms between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

User safety summary ......................................................................................... iii

Service safety summary..................................................................................... iv

List of Tables.................................................................................................... vii

List of Figures.................................................................................................... ix

General Information 1 - 1

Phaser 840 Printer Overview..........................................................................1 - 2

Phaser 850 Printer Overview..........................................................................1 - 4

Phaser 860 Printer Overview..........................................................................1 - 5

Solid inks ................................................................................................................1 - 6

Phaser 840/850 RAM and Printer Capabilities.......................................................1 - 7

Memory Considerations Phaser 840/850........................................................1 - 8

Phaser 860 RAM and Printer Capabilities....................................................1 - 10

Memory Considerations Phaser 860.............................................................1 - 11

Print Engine Assemblies 840/850/860..................................................................1 - 12

Circuit Boards...............................................................................................1 - 13

The printer’s I

Printhead Maintenance System.....................................................................1 - 16

Sensor Maps..................................................................................................1 - 17

Combination sensors and their meanings.....................................................1 - 20

Media tray type sensing ................................................................................1 - 20

The Main Board....................................................................................................1 - 21

Front Panel - Phaser 840/850 Printers ..................................................................1 - 23

Front Panel - Phaser 860.......................................................................................1 - 24

Rear Panel Connections........................................................................................1 - 25

Rear Panel Status LEDs................................................................................1 - 28

DIP Switches ................................................................................................1 - 28

Phaser 840, 850 and 860 Printer Differences .......................................................1 - 29

Specifications........................................................................................................1 - 31

Regulatory Specifications.............................................................................1 - 35

C bus ....................................................................................1 - 15

Error Codes and Messages 2 - 37

Phaser 840/850 Rear Panel PS and PE LED Codes .............................................2 - 37

Phaser 860 Power-Up Error Messages and LED Codes.......................................2 - 40

The BIST (Built-In Self Test).......................................................................2 - 40

POST (Power On Self Test) .........................................................................2 - 41

Fault Codes...........................................................................................................2 - 44

Contents i

Troubleshooting 3 - 73

Network Event Logs............................................................................................ 3 - 75

Electronics Troubleshooting ................................................................................ 3 - 76

System power-up sequence.......................................................................... 3 - 76

Inoperative printer problems........................................................................ 3 - 80

Main Board CPU operation ......................................................................... 3 - 80

Verifying print engine operation by printing a built in page....................... 3 - 81

Verifying power supply operation ............................................................... 3 - 81

Measuring power supply voltages ............................................................... 3 - 81

Inspecting the power supply fuses............................................................... 3 - 82

Testing for shorted drivers........................................................................... 3 - 83

Testing for a shorted motor.......................................................................... 3 - 84

Testing motor and solenoid resistances ....................................................... 3 - 84

Paper Path and Media-based Problems................................................................ 3 - 85

Media-based problems................................................................................. 3 - 85

Paper-pick errors.......................................................................................... 3 - 85

Print transfer jams........................................................................................ 3 - 86

Checking the process motor and drive train ................................................ 3 - 86

Media skews passing through the paper path .............................................. 3 - 87

Print Image Quality Problems.............................................................................. 3 - 88

Not printing.................................................................................................. 3 - 88

Missing ink or light colored ink band running length of print..................... 3 - 89

Color is uneven............................................................................................ 3 - 90

Streaks or lines down the print .................................................................... 3 - 91

Scratches parallel to the long axis of printing, particularly with film ......... 3 - 92

Printing too light or too dark........................................................................ 3 - 93

White portion of print is colored.................................................................. 3 - 94

Fuzzy Text ................................................................................................... 3 - 95

Poor primary color fills................................................................................ 3 - 96

Ghosting....................................................................................................... 3 - 97

Poor small text resolution ............................................................................ 3 - 98

Vertical line appear wavy ............................................................................ 3 - 99

Oil streaks on print..................................................................................... 3 - 100

Incomplete image transfer to paper ........................................................... 3 - 101

Ink smears on first side of duplex print ..................................................... 3 - 102

Repeating print defects on print................................................................. 3 - 103

Wrinkling................................................................................................... 3 - 104

Image is offset or cut off............................................................................ 3 - 105

Oil streaks on top of print .......................................................................... 3 - 105

Poor ink adhesion, poor image durability.................................................. 3 - 105

Evaluating the printhead and cap/wipe/purge system........................................ 3 - 106

Troubleshooting following cap/wipe/purge installation............................ 3 - 112

Macintosh printing problems............................................................................. 3 - 115

Image never prints ..................................................................................... 3 - 115

Image is rotated 90 degrees ....................................................................... 3 - 115

Image prints in black-and-white ................................................................ 3 - 115

Printer isn’t in the Chooser........................................................................ 3 - 116

Windows printing problems............................................................................... 3 - 117

ii Phaser 840/850/860/8200 Color Printer - Service Manual

Diagnostics, Adjustments and NVRAM 4 - 119

Front Panel Shortcuts..........................................................................................4 - 119

Hidden Service Menu.................................................................................4 - 121

Built-in Diagnostics (Phaser 860 Only)..............................................................4 - 122

Check Menu Value Keys and Descriptions (Phaser 860 only)...........................4 - 126

Check Value Menu Parameters ..................................................................4 - 135

Adjustments........................................................................................................4 - 136

Printing service test prints ..........................................................................4 - 136

Printing the Configuration Page .................................................................4 - 136

Selecting Duplex (2-sided) Oil Chase ........................................................4 - 137

Selecting Envelope Oil Chase ....................................................................4 - 137

Center Image...............................................................................................4 - 137

Locking the printhead .................................................................................4 - 138

Process belt tension adjustment..................................................................4 - 139

Exit roller drive belt tension adjustment.....................................................4 - 140

Y-axis belt tension adjustment (Phaser 840 printer)...................................4 - 142

Y-axis belts tension adjustment (Phaser 850/860 printer)..........................4 - 144

Printhead-to-drum spacing adjustment (Phaser 840 Printer Only).............4 - 146

X-axis scale adjustment ..............................................................................4 - 149

Cap/wipe/purge assembly belt adjustments................................................4 - 150

Drum position encoder gap.........................................................................4 - 152

Transfix roller pressure spring adjustment .................................................4 - 154

Vacuum check (Phaser 840/850 Only)...............................................................4 - 155

Resetting NVRAM .............................................................................................4 - 156

Test Prints 5 - 159

1: X-axis motion .........................................................................................5 - 160

2: Weak/missing jet ....................................................................................5 - 161

3: Color Bands, RGBK Dither....................................................................5 - 161

4: Reverse Text...........................................................................................5 - 162

5: Big Bands Hand-fed OHP ......................................................................5 - 162

6: 66% Gray, dot size uniformity ...............................................................5 - 163

7: Manuf. Dot position (scanner)................................................................5 - 164

8: YMCKRGB Solid Fills ..........................................................................5 - 164

9: Drum Seal..............................................................................................5 - 165

10: Manuf. paper path.................................................................................5 - 165

11: Head-to-Drum Gap...............................................................................5 - 166

12.: Manuf x-axis (scanner)........................................................................5 - 166

13: Black Solid Fill.....................................................................................5 - 167

14: Red Solid Fill........................................................................................5 - 167

15: Green Solid Fill ....................................................................................5 - 168

16: Blue Solid Fill.......................................................................................5 - 168

17: Cyan Solid Fill......................................................................................5 - 169

18: Magenta Solid Fill ................................................................................5 - 169

19: Yellow Solid Fill ..................................................................................5 - 170

20: OHP Color Bands.................................................................................5 - 170

21: Primary Solid Fills 10x.........................................................................5 - 171

Contents iii

22: Manuf. Skew Margins ......................................................................... 5 - 171

23: Manuf. Banding................................................................................... 5 - 171

Cleaning and Maintenance 6 - 173

Cleaning............................................................................................................. 6 - 174

Pick Roller Cleaning Method .................................................................... 6 - 175

Cleaning Page (Phaser 840 printer only)................................................... 6 - 175

Vacuum...................................................................................................... 6 - 175

Drum temperature sensor........................................................................... 6 - 175

Maintenance....................................................................................................... 6 - 176

Maintenance roller..................................................................................... 6 - 176

Waste tray .................................................................................................. 6 - 176

Lubrication......................................................................................................... 6 - 177

Inspection........................................................................................................... 6 - 178

Key FRU Removal and Replacement 7 - 179

Main board and its components................................................................. 7 - 180

Power supply.............................................................................................. 7 - 183

Power control board.................................................................................. 7 - 184

Upper feed roller assembly ........................................................................ 7 - 185

Paper/drum heater...................................................................................... 7 - 187

Drum/transfix assembly............................................................................. 7 - 188

Drum position sensor assembly (Phaser 840 printer) ................................ 7 - 192

Drum position sensor assembly (Phaser 850/860)..................................... 7 - 194

Printhead .................................................................................................... 7 - 196

X-axis motor and drive assembly .............................................................. 7 - 199

Y-axis belt drive assembly (Phaser 840 printer)........................................ 7 - 200

Y-axis belt drive assembly (Phaser 850/860 printer)................................. 7 - 201

Cap/wipe/purge assembly (Phaser 840 printer) ......................................... 7 - 202

Cap/wipe/purge assembly (Phaser 850/860 printer).................................. 7 - 204

FRU Parts List 8 - 207

Cabinet FRU’s ........................................................................................... 8 - 208

Imaging FRU’s .......................................................................................... 8 - 210

Paper Path FRU’s....................................................................................... 8 - 212

Motor and Fan FRUs ................................................................................. 8 - 214

Circuit Board FRUs ................................................................................... 8 - 216

Solenoid and Clutch FRUs ........................................................................ 8 - 218

Gear and Belt FRUs................................................................................... 8 - 220

Sensor and Flag FRUs ............................................................................... 8 - 222

High-capacity Paper Tray Assembly ......................................................... 8 - 224

Service tools....................................................................................................... 8 - 226

Supplies and accessories.................................................................................... 8 - 227

iv Phaser 840/850/860/8200 Color Printer - Service Manual

Wiring Diagrams 9 - 235

Phaser 8200 Color Printer Addendum PA - 241

Phaser 8200 Printer Configurations........................................................ PA - 241

Hardware Updates .................................................................................. PA - 241

Internal Pages and Menu Items............................................................... PA - 241

Inks ......................................................................................................... PA - 242

Memory................................................................................................... PA - 242

Appendix A - 243

On-site Printhead Troubleshooting Checklist

Phaser 340/350/360/380/840/850..............................................................A - 244

On-site Electronics Troubleshooting Checklist Phaser 840/850 ...............A - 250

Z840/z850 Electronics Troubleshooting Guide.........................................A - 253

On-site Printhead Troubleshooting Checklist

Phaser 860/8200.........................................................................................A - 261

On-site Electronics Troubleshooting Checklist Phaser 860 ......................A - 266

Contents v

vi Phaser 840/850/860/8200 Color Printer - Service Manual

List of Tables

Installed RAM and printer capabilities - - - - - - - - - - - - - - - - - - - - - - - - - 1-8 Acceptible SDRAM DIMMs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-9 Acceptible SODIMMs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-10 Installed RAM and printer capabilities - - - - - - - - - - - - - - - - - - - - - - - - 1-11 Tray switch sensor combinations - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-20 Rear panel DIP switch settings - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-28 Summary of differences between Phaser 840/850/860 - - - - - - - - - - - - - - - - - 1-29 Physical dimensions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-31 Printer installation clearances - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-31 Functional specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-32 Electrical specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-33 Environmental specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-34 Main board power-up self-test error codes - - - - - - - - - - - - - - - - - - - - - - 2-37 BIST Rear Panel LED Codes - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-40 POST (Power On Self Test) Error Messages - - - - - - - - - - - - - - - - - - - - - 2-41 Front Panel & Fault History Log Error Codes and Messages - - - - - - - - - - - - - - 2-45 22,LSS.TC Error Codes: Media Jams - - - - - - - - - - - - - - - - - - - - - - - - - 2-59 22,000 Fault Codes and Actions - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-60 Front Panel & Fault History Log Error Codes and Messages - - - - - - - - - - - - - - 2-71 Electrical Interface RAP Table - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-73 Media and Paper Path RAP Table - - - - - - - - - - - - - - - - - - - - - - - - - - 3-73 Print and Image Quality Problems RAP Table - - - - - - - - - - - - - - - - - - - - 3-74 Macintosh Printing Problems RAP Table - - - - - - - - - - - - - - - - - - - - - - - 3-74 Motor and solenoid resistances - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-84 Not Printing - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-88 Missing or light colored ink band - - - - - - - - - - - - - - - - - - - - - - - - - - 3-89 Color is uneven - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-90 Streaks or lines down the print - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-91 Scratches parallel to the long axis of printing - - - - - - - - - - - - - - - - - - - - - 3-92 Printing too light or too dark - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-93 White portion of print is colored - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-94 Fuzzy Text - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-95 Poor primary color fills - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-96 Ghosting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-97 Poor small text resolution - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-98 Vertical line appears wavy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-99 Oil streaks on print - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-100 Incomplete image transfer to paper - - - - - - - - - - - - - - - - - - - - - - - - - -3-101 Ink smears on first side of duplex printt - - - - - - - - - - - - - - - - - - - - - - - -3-102 Repeating print defects on the print - - - - - - - - - - - - - - - - - - - - - - - - - -3-103 Wrinkling - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-104 Front Panel Shortcuts - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-119

List of Tables vii

Hidden Service Menu - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-121 Diagnostic Menu Map - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-123 Check Menu Value Key - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-127 Test Print Menu - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-159 Maintenance Kit Life - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-176 Cabinet FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-209 Imaging FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-210 Paper path FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-213 Motor and fan FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-215 Circuit board FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-216 Solenoid and clutch FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-219 Gear and belt FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-221 Sensor and flag FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-223 High-capacity Paper Tray FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - 8-225 Service tools - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-226 Supplies and accessories - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-227

viii Phaser 840/850/860/8200 Color Printer - Service Manual

List of Figures

The Phaser 840/850 printer shown with optional High-Capacity Paper Tray Assembly. - - 1-1 The Phaser 860 printer shown with the optional High-Capacity Paper Tray Assembly.- - - 1-1 Internal features of the print engine - - - - - - - - - - - - - - - - - - - - - - - - - - 1-12 Circuit boards of the print engine (right front view of the Phaser 850)- - - - - - - - - - 1-13 Circuit boards of the print engine (left rear view Phaser 850) - - - - - - - - - - - - - - 1-14 Circuit Boards of the print engine (right rear view Phaser 860) - - - - - - - - - - - - - 1-14 The printer’s I Printhead maintenance system of the print engine - - - - - - - - - - - - - - - - - - - 1-16 Sensors and switches on the right side of the print engine - - - - - - - - - - - - - - - 1-17 Switches and Sensors on the left side of the print engine - - - - - - - - - - - - - - - - 1-18 Solenoids and clutches on the print engine - - - - - - - - - - - - - - - - - - - - - - 1-19 Features of the Phaser 840 printer main board - - - - - - - - - - - - - - - - - - - - - 1-21 Features of the Phaser 860 Main Board - - - - - - - - - - - - - - - - - - - - - - - - 1-22 Features of the Phaser 850 printer main board - - - - - - - - - - - - - - - - - - - - - 1-22 Printer front panel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-23 Front Panel - Phaser 860 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-24 Phaser 840 printer rear panel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-25 Phaser 850 printer rear panel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-26 Phaser 860 printer rear panel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-27 Attaching the service load connector to J250 - - - - - - - - - - - - - - - - - - - - - 3-83 Faceplate showing blade wipe with no drops, smudges or streaks - - - - - - - - - - - -3-107 Faceplate showing streaks and smudges from a poor wipe - - - - - - - - - - - - - - - 3-107 Connecting the vacuum gauge to the printer - - - - - - - - - - - - - - - - - - - - - -3-108 Maintenance tray showing good purge - - - - - - - - - - - - - - - - - - - - - - - -3-111 Damaged printhead data cable - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-113 Inadvertently disconnected thermistor cable connector - - - - - - - - - - - - - - - - -3-114 Setting process belt tension - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-139 Setting exit roller drive belt tension - - - - - - - - - - - - - - - - - - - - - - - - - -4-141 Pull the lever arm and press the tool firmly against the printer frame to set tension. - - - 4-143 Setting the Y-axis belt tension Phaser 850/860- - - - - - - - - - - - - - - - - - - - -4-145 Attaching clips. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-146 Adjusting the tension spring - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-147 Drum adjustment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-148 Adjusting the x-axis scale adjustment - - - - - - - - - - - - - - - - - - - - - - - - -4-149 Aligning (timing) the cap/wipe/purge assembly drive belts - - - - - - - - - - - - - - - 4-151 Setting the drum position encoder gap- - - - - - - - - - - - - - - - - - - - - - - - - 4-153 Adjusting the transfix roller pressure springs - - - - - - - - - - - - - - - - - - - - -4-154 Connecting the vacuum gauge to the printer - - - - - - - - - - - - - - - - - - - - - -4-155 Resetting print engine NVRAM menu item - - - - - - - - - - - - - - - - - - - - - -4-157 Clearing PostScript NVRAM menu item - - - - - - - - - - - - - - - - - - - - - - -4-157 Lubricating the transfix cam - - - - - - - - - - - - - - - - - - - - - - - - - - - - -6-177 Removing the Phaser 840 printer main board - - - - - - - - - - - - - - - - - - - - -7-180

C bus - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-15

List of Figures ix

Removing the Phaser 850 printer main board - - - - - - - - - - - - - - - - - - - - 7-181 Removing the Main Board (Phaser 860) - - - - - - - - - - - - - - - - - - - - - - - 7-182 Removing the power supply- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-183 Removing the power control board - - - - - - - - - - - - - - - - - - - - - - - - - 7-184 Remove the upper feed roller assembly (left side) - - - - - - - - - - - - - - - - - - 7-185 Removing the upper feed roller assembly (front) - - - - - - - - - - - - - - - - - - - 7-186 Removing the paper/drum heater - - - - - - - - - - - - - - - - - - - - - - - - - - 7-187 Removing the drum transfix assembly (left side) - - - - - - - - - - - - - - - - - - - 7-189 Removing the drum/transfix assembly (right side) - - - - - - - - - - - - - - - - - - 7-190 Marking the drum home flag sensor alignment - - - - - - - - - - - - - - - - - - - - 7-192 Removing the drum position sensor assembly (Phaser 840 printer) - - - - - - - - - - 7-193 Marking the shaft for drum home alignment - - - - - - - - - - - - - - - - - - - - - 7-194 Removing the drum position sensor assembly (Phaser 850 printer) - - - - - - - - - - 7-195 Plugging the reservoir holes- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-196 Removing the printhead - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-197 Removing the x-axis motor and drive assembly - - - - - - - - - - - - - - - - - - - 7-199 Removing the Y-axis belt drive assembly (Phaser 840 printer) - - - - - - - - - - - - 7-200 Removing the Y-axis belt drive assembly (Phaser 850/860 printer) - - - - - - - - - - 7-201 Removing the cap/wipe/purge assembly (Phaser 840 printer) - - - - - - - - - - - - - 7-203 Removing the lower cap/wipe/purge retainer clip- - - - - - - - - - - - - - - - - - - 7-204 Removing the lower cap/wipe/purge retainer clip- - - - - - - - - - - - - - - - - - - 7-205 Removing the cap/wipe/purge assembly (Phaser 850/860 printer) - - - - - - - - - - - 7-206 Cabinet FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-208 Imaging FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-210 Paper path FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-212 Motor and fan FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-214 Circuit Board FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-216 Solenoid and Clutch FRUs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-218 Gear and belt FRUs- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-220 Sensor and flag FRUs- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-222 High-capacity Paper Tray - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-224 New ink sticks - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - PA-242

x Phaser 840/850/860/8200 Color Printer - Service Manual

General Information

This service guide contains information used to verify operation, troubleshoot, repair, adjust, and maintain the Xerox Phaser® 840, Phaser® 850 and Phaser® 860 Color Printers. This guide includes a Field Replacement Unit Parts list. Topics such as printer theory of operation, detailed removal/replacement procedures, configuration page details, and verifying printer operation are located on the companion Color Printer Service & Support Resources CD-ROM.

To ensure complete understanding of the product, we recommend participation in Phaser 840/850/860 printer service training.

0388-01

Fig 1-1 The Phaser 840/850 printer shown with optional

High-Capacity Paper Tray Assembly.

P860-001

Fig 1-2 The Phaser 860 printer shown with the optional

High-Capacity Paper Tray Assembly.

General Inormation 1 - 1

Phaser 840 Printer Overview

The Phaser 840 Color Printer is an Adobe PostScript® Level 3 (Version 3010) color, solid-ink printer. It also supports color PCL 5c at 600 x 600 dots-per-inch resolution. The Phaser 840 printer prints at a number of resolutions: A 10 page-per-minute (ppm) Fast Color Mode, a standard 5.7 ppm mode, an Enhanced mode of 491 x 982 dpi at 3.3 ppm and a High-Resolution/Photo mode of 600 x 1200 dpi at 2.2 ppm. All printer models but the standard version feature built-in automatic two-sided printing.

Standard Phaser 840N. The Standard Phaser 840 printer features 136 built-in fonts,

and is equipped with 32 Mbytes of RAM. It can be upgraded to as much as 128 Mbytes of RAM using any combination of two 32-, and 64-Mbyte RAM DIMMs.

The Phaser 840DP. The Phaser 840 DP printer option upgrades the base printer to

64 Mbytes of RAM. It includes a SCSI port daughter card to support an external SCSI disk for additional font storage as well as a scanner. Special circuitry on the SCSI port daughter card enables additional features like duplex printing, job pipelining and First page Preview mode. With job pipelining, the printer can print one image and process the data for the next image at the same time. First Page Preview mode prints the first page of a multiple page print job while holding the remainder of the job pending front panel approval.

The Phaser 840DX. The extended features option has all the features of the Phaser

840 Plus printer but includes additional RAM to bring the printer to 128 Mbytes of RAM. It also includes a High-capacity Paper Tray and an internal IDE hard drive.

The Phaser 840GP. This Designer Edition printer includes all the features of the

Phaser 840DP but includes 128 Mbytes of RAM, a 10/100BaseT network card, and translucent blue cabinet panels.

The Phaser 840DPF. This freecolorprinters.com program printer is a Phaser 840DP

printer but it also includes a High-Capacity paper Tray and 3 years of onsite service.

All printers support four available paper trays: Two A and A4 trays are intended for paper and low volumes of transparencies; two other A and A4 trays are meant for label stock and high-volume transparencies. The optional 500-sheet High-capacity Paper Tray Assembly gives the printer a two-tray capability. With the addition of a second High-capacity Paper Tray, the printer has a three-tray capability. (The High-capacity Paper Tray Assembly is sometimes referred to as a lower feeder; it only supports paper printing.) The printer can also print six sizes of handfed envelopes.

1 - 2 Phaser 840/850/860/8200 Color Printer - Service Manual

A 133-MHz PowerPC processor oversees print engine operations and PostScript image processing. The printer features an integral bi-directional parallel port (IEEE 1284C with ECP mode) and a 10BaseT Ethernet port (with support for EtherTalk, Novell NetWare/NDS, TCP/IP, DHCP and Windows Peer-to-Peer). A USB high-speed serial port is also provided. A rear panel slot allows customers to install one “smart card” PhaserShare Series B Network Card. One card provides a LocalTalk port. A second, alternative card offers a 10/100BaseT/10Base2 Ethernet board providing standard protocol support for EtherTalk, Novell NetWare/NDS, TCP/IP and DHCP. When installed, this card disables the standard 10baseT port. A third card provides a Token Ring board providing protocol support for TokenTalk, Novell NetWare/NDS and TCP/IP. When inserted, this card also disables the standard 10baseT port.

A second rear panel slot accommodates an internal IDE hard drive for print job collation, job accounting, and font storage.

The printer features Job Accounting, which maintains from 50 to 5000 records of processed print jobs, depending on memory options and hard drive options. The record contains information such as time and duration of the print and the percentage of color coverage on the print. The log of records can be retrieved using PhaserLink, PhaserShare or CentreWare IS software.

General Information 1 - 3

Phaser 850 Printer Overview

The Phaser 850 Color Printer is an Adobe PostScript Level 3 (Version 3010) color, solid-ink printer. It also supports color PCL 5c at 600 x 600 dots-per-inch resolution. The Phaser 850 printer prints at a number of resolutions: A 13.9 page-per-minute (ppm) Fast Color Mode, a standard 7.9 ppm mode, an Enhanced mode of 450 x 818 dpi (with dot-size switching) at 4 ppm and a High-Resolution/Photo mode of 600 x 1200 dpi at 2.2 ppm. The printer also includes a 6.3 ppm Fast Transparency Mode and a 3.4 ppm Standard Transparency Mode.

Standard Phaser 850N. The Standard Phaser 850 printer features 136 built-in fonts,

and is equipped with 32 Mbytes of RAM. It can be upgraded to configurations of 64, 128, 192, and 256 Mbytes of RAM using combinations of two 32-, and 64-, and 128-Mbyte RAM DIMMs.

The Phaser 850DP. The Phaser 850DP printer option upgrades the printer to

64 Mbytes of RAM and includes additional features like 2-sided printing, job pipelining and First Page Preview mode.

The Phaser 850DPF. This is a freecolorprinters.com program printer which includes a

High-Capacity paper tray and 3 years of on-site service.

The Phaser 850DX. The extended features DX option has all the features of the

Phaser 850DP printer, but includes additional RAM to bring the printer to 128 Mbytes of RAM. It also includes a High-Capacity Paper Tray and an internal IDE hard drive.

Like the Phaser 840 printer, all printers support four available paper trays. They also support the optional 500-sheet High-Capacity Paper Tray Assembly. The printer can also print seven sizes of hand-fed envelopes.

A 200-MHz PowerPC processor oversees print engine operations and PostScript image processing. The printer features a 10/100BaseT Ethernet port (with support for EtherTalk, Novell NetWare/NDS, TCP/IP, DHCP and Windows Peer-to-Peer). A USB high-speed serial port is also provided. A rear panel slot allows customers to install a Token Ring card supporting TokenTalk, Novell NetWare/NDS and TCP/IP. When inserted, this card also disables the standard 10/100BaseT port. LocalTalk and 10Base2 are not supported by the Phaser 850 printer. A second rear panel slot accommodates an internal IDE hard drive for print job collation, job accounting, font storage and PDF direct printing.

An integral bi-directional parallel port (IEEE 1284C with ECP mode) supports printing and also allows connecting a parallel interface scanner for optical copying support.

Like the Phaser 840 printer, the Phaser 850 printer supports Job Accounting.

1 - 4 Phaser 840/850/860/8200 Color Printer - Service Manual

Phaser 860 Printer Overview

The Phaser 860 Color Printer is an Adobe PostScript Level 3 (Version 3010) color, solid-ink printer. It also supports color PCL 5c at 600 x 600 dots-per-inch resolution. The printer can print at the following resolutions:

■ Fast Color mode, 16 page-per-minute (ppm)

■ Standard mode, 10 ppm mode at 355 x 464 dpi

■ Enhanced mode, 6 ppm at 464 x 928 dpi

■ High-Resolution/Photo mode, 3.5 ppm at of 600 x 1200 dpi.

The printer also includes a 7 ppm Fast Transparency mode and a 4 ppm Standard Transparency Mode (double-pass). Both modes are at 355 x 464 dpi.

The Phaser 860B. The Phaser 860B printer features 136 built-in fonts, and is equipped

with 64 Mbytes of RAM. The Phaser 860B can be upgraded to configurations of 64, 128, 192 and 256 Mbytes of RAM using combinations of 64- and 128 Mbytes RAM SODIMMs. The Phaser 860B does not support networking or High-resolution/Photo mode.

The Phaser 860N. The Phaser 860N printer adds a 10/100 BaseT Ethernet port and

has all the same features as the Phaser 860B model.

The Phaser 860DP. The Phaser 860DP printer option upgrades the printer to

128 Mbytes of RAM and includes additional features like 2-sided printing, job pipelining and High Resolution Photo mode.

The Phaser 860DPF. This is a freecolorprinters.com program printer. The Phaser

860DPF has all the features of the Phaser 860DP printer, but adds a High-capacity paper tray and 3 years of on-site service.

The Phaser 860DX. The extended features DX option has all the features of the

Phaser 860DP printer, but includes a High-capacity Paper Tray and an internal IDE hard drive.

All printers support five available paper trays: Two A and A4 trays are meant for paper and low volumes of transparencies; two other A and A4 trays are meant for label stock and high-volume transparencies; and a legal size paper tray which comes with an output bail. There is an optional 500-sheet High-capacity Paper Tray Assembly gives the printer a two-tray capability. With the addition of a second High-Capacity Paper Tray, the printer has a three-tray capability. (The High-Capacity Paper Tray Assembly is sometimes referred to as a lower feeder; it only supports paper printing.) The printer can also print six sizes of hand-fed envelopes.

A 250-MHz PowerPC processor oversees print engine operations and PostScript image processing. All configurations, except the Phaser 860B feature a 10/100BaseT Ethernet port (with support for EtherTalk, Novell NetWare/NDS, TCP/IP, DHCP and Windows Peer-to-Peer). A USB high-speed serial port is also provided. LocalTalk, Tolken Ring and 10Base2 are not supported by the Phaser 860 printer. An internal IDE hard drive can be installed on the main board for font storage and job accounting, if the printer has DP features the hard drive will support collation, proof print, saved print and secure print.

An integral bi-directional parallel port (IEEE 1284C with ECP mode) supports printing and also allows connecting a parallel interface scanner for optical copying support.

General Information 1 - 5

The printer supports Job Accounting which maintains from 50 to 5000 records of processed print jobs, depending on memory and hard drive options. The record contains information such as time duration of the print and the percentage of color coverage on the print. The log of reconds can be retrieved using CentreWare software.

Proof Print Jobs. A proof job is a specific case of a multiple-copy job. With a proof

job, the customer assigns a password and copy account at the client workstation before printing. The first set of prints are printed immediately. The original number of requested sets are printed after the customer enters the matching password on the printer’s control panel. The customer has the option of printing the original number of requested sets or deleting the job. Using the same password will cause any previous job(s) to be deleted. A proof job that has not been printed is retained on hard disk through power cycles. Proof jobs sent to a printer without the hard disk option are not printed and are discarded.

Secure Print Jobs. Secure printing allows the customer to defer printing of a job until

a matching password is entered from the control panel. The customer assigns the password at the client workstation before printing. The job is stored, and printing is delayed until the password is entered on the printer’s control panel. Using the same password will cause any previous jobs(s) to be deleted. A secure job that has not been printed or released is retained on disk through power cycles. This function requires the internal hard drive.

Saved Print Jobs.

Saved print allows the user to save print jobs to the internal hard drive of the printer. The print job is not deleted after printing, it is stored on the hard drive for print on demand. This function requires the internal hard drive.

Solid inks

Solid inks, sometimes called phase-change inks, are solid at room temperature and are liquid at the higher temperature used during printing. The inks solidify almost instantly after being jetted onto the printer’s drum. Because Xerox proprietary solid inks bleed much less than ordinary liquid inks, they allow the printer to print brilliant colors on plain paper.

Each Xerox solid-ink printer’s inks are especially formulated for that printer; the inks are NOT interchangeable. Using the wrong ink in a printer may damage the

printhead or other subsystems. The Phaser 860 uses the ColorSticks® II ink formulation which enables solid ink documents to be fed through auto-document feeders on copiers.

Note Turning the printer off and allowing it to cool causes it to perform

a printhead cleaning and purge cycle upon power-up. The printer's purge cycle consumes a significant amount of ink. During normal use and servicing, turn the printer off and allow it to cool only when necessary.

1 - 6 Phaser 840/850/860/8200 Color Printer - Service Manual

Phaser 840/850 RAM and Printer Capabilities

The Phaser 840 printer features two DIMM connectors which accept both 32- or 64-Mbytes RAM DIMMs (16-Mbyte RAM DIMMs work but are not offered). The Phaser 850 printer features two DIMM connectors which will accept both 64- or 128-Mbytes RAM DIMMs. The printers can use SDRAM DIMMs meeting these specifications:

■ 168-pin DIMM

■ Synchronous DRAM

■ 3.3 volts

■ 10 nsec speed

■ Valid on-board Serial Presence Detect ROM

■ Unbuffered

■ Latency of 2

■ 9 address columns (Phaser 850 printer allows 32-Mbytes DIMM to be in 8

columns)

■ Maximum of 2.8 cm (1.1 in.) in height (Phaser 840 printer only). SDRAM

DIMMs from other Phaser printers, such as the Phaser 740 and Phaser 780 color printers may be too tall to fit inside a Phaser 840 printer.

Upon power-up, the image processor interrogates the 256-byte Serial Presence Detect EEPROM, which describes the DIMM in great detail, such as data width, clock delay, number of address columns and row, refresh rate and more. If the DIMM does not meet the required specifications, it will be ignored; no error message will be reported.

General Information 1 - 7

Memory Considerations Phaser 840/850

With more memory, the printer dual-frame buffers for printing one image while processing a second image (which gives greater printing throughput). The printer’s capabilities can be increase as detailed in the following table.

For the Phaser 840 printer, adding RAM memory, and installing the SCSI daughter card enables the Plus and Extended configurations features.

For the Phaser 850 printer, installing the DP Option code ROM module and adding RAM enables these features.

Table 1-1 Installed RAM and printer capabilities

Feature (32 Mbytes)

Fast Color (draft) printing

Standard Printing yes yes yes

Enhanced Printing yes yes yes

High-Resolution/ Photo Printing

2-sided printing no yes. The printer

Color PCL 5C yes yes yes

Pipelining no yes yes

Check Print no yes yes

Collation (requires hard drive)

Job accounting 50 records 500 records. 5000

Frame buffer (lower print resolutions can provide additional frame buffer space)

840N 850N

yes yes yes

no yes yes

1 Letter size image 1 Letter-size image 2 Letter-size images

(64 Mbytes) 840DP 850DP

supports fast, standard and enhanced 2-sided prints

records with optional hard drive

(128 Mbytes) 840DX 850DX

yes. The printer supports 2-sided, high-resolution, 1200 x 600 dpi print

5000 records with included hard drive

1 - 8 Phaser 840/850/860/8200 Color Printer - Service Manual

Print the Configuration Page and check the item “Installed RAM” to see what type of RAM is installed.

For example:

Installed RAM: 64 Mbytes

Mem slot 1: SDRAM/parity/64 MB/KMM366S823BTL-G0

Mem slot 2: Empty

This is a list of SDRAM DIMMs that are branded for use by Xerox in this printer at the time this guide was published:

Table 1-2 Acceptible SDRAM DIMMs

Size Maker Part Number Printer

32 Mbytes Samsung KMM366S403CTL-G0 840/850

32 Mbytes Micron MT16LSDT464AG-662XX 840/850

64 Mbytes Samsung KMM366S823BTL-G0 840/850

64 Mbytes Micron/Crucial CT8M64S4D10-MBTBGLP 840/850

32 Mbyte Samsung KMM366S424DTS-GL 850 (see note)

64 Mbyte Samsung KMM366S823DTS-GL 850

64 Mbyte Samsung KMM366S924BTS-GL 850

128 Mbytes Samsung KMM366S1623DT-GL 850

128 Mbytes Samsung KMM366S1724BT-GL 850

32 Mbytes Micron MT4LSDT464AG-662xx 850 (see note)

32 Mbytes Micron MT4LSDT464AG-10Exx 850 (see note)

64 Mbytes Micron MT8LSDT864AG-662xx 850

64 Mbytes Micron MT8LSDT864AG-10Exx 850

64 Mbytes Micron MT4LSDT864AG-662xx 850

64 Mbytes Micron MT4LSDT864AG-10Exx 850

128 Mbytes Micron MT16LSDT1664AG-662xx 850

128 Mbytes Micron MT16LSDT1664AG-10Exx 850

Note The 32-Mbyte DIMM marked for 850-only are not compatible

with the other RAM DIMMs because the 32-Mbyte RAM DIMM is an 8-column type; the other DIMMs are 9-column types.

If one of each type is installed in the Phaser 850 printer, only the 9-column DIMM will be enabled.

General Information 1 - 9

Phaser 860 RAM and Printer Capabilities

The Phaser 860 printer features two SODIMM connectors which accept off the shelf 64MB or 128 MB SODIMM SDRAM memory modules meeting these specifications:

■ 144-pin SODIMM

■ Synchronous DRAM

■ 3.3 volts

■ PC100 compliant

■ Valid on-board Serial Presence Detect ROM

■ Built using 64 or 128Mbit SDRAM parts

■ 100MHz operation at CAS Latency = 2

Upon power-up, the image processor interrogates the Serial Presence Detect EEPROM, which describes the SODIMM in great detail, such as data width, clock delay, number of address columns and row, refresh rate and more. If the SODIMM does not meet the required specifications, it will be not be used. If there are no good SODIMMs you will receive a RAM error. If one SODIMM is good you will receive a temporary error message and the printer will continue with power up.

Print the Configuration Page and check the item “Installed RAM” to see what type of RAM is installed.

This is a list of SODIMMs that are branded for use by Xerox in this printer at the time this guide was published:

Table 1-3 Acceptible SODIMMs

Size Maker Part Number

64 Mbytes Samsung 156-4831-00

64 Mbytes Micron MT8LSDT864HG-10E

128 Mbytes Samsung 156-4832-00

128 Mbytes Micron MT8LSDT1664HG-10E

1 - 10 Phaser 840/850/860/8200 Color Printer - Service Manual

Memory Considerations Phaser 860

For the Phaser 860 printer, installing the DP Option code ROM module and adding RAM enables these features.

Table 1-4 Installed RAM and printer capabilities

Feature (64 Mbytes)

Fast Color (draft) printing

Standard Printing yes yes

Enhanced Printing yes yes

High-Resolution/ Photo Printing

2-sided printing no yes. The printer

Color PCL 5c yes yes

Pipelining no yes

Collation (requires hard drive)

Job accounting 500 records. 500 records. 5000

Frame buffer (lower print resolutions can provide additional frame buffer space)

Proof Print Secure Print Saved Print

(Requires Hard Drive)

860B 860N

yes yes

no yes

1 Letter-size image 2 Letter-size images

no yes

(128 Mbytes) 860DP 860DPF 860DX

supports 2-sided, high-resolution, 1200 x 600 dpi print

records with included hard drive

General Information 1 - 11

Print Engine Assemblies 840/850/860

Cap/wipe/purge assembly

Drum

Transfix roller

rocess

otor

Paper/ drum heater

Y-axis motor

Printhead

Paper feed motor

Ink load assembly

X-axis drive and motor

0388-

Fig 1-3 Internal features of the print engine

1 - 12 Phaser 840/850/860/8200 Color Printer - Service Manual

Circuit Boards

Seven circuit boards support the printer’s electronics. Two boards, called I/O boards (left and right), support the front panel, solenoids and sensors. The main board contains the printer’s CPU processor, RAM and ROM. The power control board distributes power supply voltages to the other printer boards and many of the printer motors. The power supply converts the AC line voltage into internal AC and DC voltages. The front panel provides a user interface to the printer. The printhead drive board, a part of the printhead, manages the signals and voltages of the printhead’s printing elements and sensors. The optional network card (Phaser 840 and 850 only) and internal hard drive could be considered eight and ninth circuit boards.

Front panel

I/O board right

0388-03

Fig 1-4 Circuit boards of the print engine (right front view of the Phaser 850)

General Information 1 - 13

Printhead drive board

Internal hard drive

Drum Maintenance counter

Network

EEPROM

card

Power supply

I/O board

Main board

left

Fig 1-5 Circuit boards of the print engine (left rear view Phaser 850)

Printhead Drive Board

Power Control Board

I/O Board left

Power control board

0388-04

Drum Maintenance Counter EEPROM

Internal Hard Drive

Main Board

Power Supply

P860-004

Fig 1-6 Circuit Boards of the print engine (right rear view Phaser 860)

1 - 14 Phaser 840/850/860/8200 Color Printer - Service Manual

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