Tektronix Phaser 840 User manual

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

operating instructions unless you are qualified

to do so.

This printing: May 1998

071-0388-00

PHASER® 840

COLOR LASER PRINTER

Service Quick Reference Guide

1998 by Tektronix, Inc., Wilsonville, Oregon. Printed in the United

reproduced in any form without permission of Tektronix, Inc.

Tektronix

, Phaser

, and Made for Each Other

are registered trademarks of

Tektronix, Inc. TekColor™, PhaserShare™, PhaserMatch™, PhaserLink™,

Finepoint™ and PhaserPrint™ are trademarks of Tektronix, Inc.

RealSUPPORT

and TekColor Care

are service marks of Tektronix, Inc.

Other marks are trademarks or registered trademarks of the companies with

which they are associated.

November 1998. First printing

December 1998. Changed pages: 41, 60, 76, 84, 85, 108, 126, 133

May 1999. Changed pages: 5, 61, 62, 68, 74, 112, 118, 124, 126, 127, 147, 149

TE/mq/mm

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:

WARNING:

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.

Service Guide

Contents

General Information 1

Phaser 840 printer overview 2

Solid inks 3

About RAM upgrades 3

Memory considerations 4

Print engine assemblies 6

The main board 14

Combination sensors and their meanings 15

Media tray type sensing 15

Front panel 16

Rear panel 18

Regulatory specifications 24

Error Codes and Messages 25

Rear panel LEDs error codes 25

Error messages 28

Troubleshooting 37

System power-up sequence 37

Verifying main board CPU operation 39

Verifying print engine operation by printing its startup page 39

Verifying power supply operation 39

Measuring power supply voltages 40

Inspecting the power supply fuses 40

Testing for shorted drivers 41

Testing for a shorted motor 42

Testing motor and solenoid resistances 42

Media jams and the paper path 43

Media-based problems 43

Paper-pick errors 43

Print transfer jams 44

Checking the process motor and drive train 45

Media skews passing through the paper path 45

Printing and print quality problems 46

Streaks or lines across the print 46

Streaks or lines down the print 46

Missing ink or light colored ink band running length of print 47

Scratches parallel to the long axis of printing, particularly with film 48

White portion of print is colored 48

Color is uneven 49

Not printing 49

Phaser 840 Color Printer

Printing too light or too dark 49

Fuzzy text 50

Poor primary color fills 50

Poor small text resolution 51

Ghosting 51

Variation of density on second side of print 52

Ghost of first side image on second side of print 52

Vertical line appear wavy 52

Oil streaks on print 53

Poor ink adhesion, poor image durability 53

Incomplete image transfer to paper 54

Ink smears of first side of duplex print 55

Repeating print defects on print 55

Banding parallel to long edge of print 56

Wrinkling 56

Image is offset or cut off 57

Oil streaks on top of print 57

Macintosh printing problems 57

Image never prints 57

Image prints in black-and-white 58

Image is rotated 90 degrees 58

Printer isn’t in the Chooser 58

Windows printing problems 58

Image never prints 58

Adjustments 59

Bypass mode (manufacturing mode) 59

Cool down mode 59

Hidden service menu 60

Bypassing a “short menu” 60

Printing service test prints 61

Printing the Configuration Page 61

Selecting Duplex Oil Chase 61

Adjustments 62

Process belt tension adjustment 62

Exit roller drive belt tension adjustment 63

Y-axis belts tension adjustment 64

Printhead-to-drum spacing adjustment 66

Cap/wipe/purge assembly belt adjustments 68

Drum position encoder gap 70

Transfix roller pressure spring adjustment 72

X-axis scale adjustment 74

Vacuum check 75

Service Guide

vii

Cleaning and Maintenance 77

Cleaning 78

Cleaning Page 79

Vacuum 79

Drum temperature sensor 79

Maintenance 80

Maintenance roller 80

Waste tray 80

Lubrication 81

Inspection 82

Resetting NVRAM 83

Key FRU Removal and Replacement 87

Main board 88

Power supply 89

Power control board 90

Paper/drum heater 91

Upper feed roller assembly 92

Drum/transfix assembly 94

Drum position sensor assembly 99

Printhead 101

X-axis motor and drive assembly 104

Y-axis belt drive assembly 105

Cap/wipe/purge assembly 106

Locking the printhead 108

FRU List 109

High-capacity Paper Tray Assembly 126

Service tools 128

Supplies and accessories 128

Test Prints 133

Wiring Diagrams 145

viii

Phaser 840 Color Printer

Figures

The Phaser 840 printer (shown with optional

High-capacity Paper Tray Assembly) 1

Internal features of the print engine 6

Circuit boards of the print engine (right front view) 7

Circuit boards of the print engine (left-rear view) 8

The printer’s I

C bus 9

Printhead maintenance system of the print engine 10

Sensors and switches on the right side of the print engine 11

Sensors and switches on the left side of the printer 12

Solenoids and clutches on the print engine 13

Features of the main board 14

Printer front panel 17

Printer rear panel 19

Attaching the service load connector to J250 41

Setting process belt tension 62

Setting exit roller drive belt tension 63

Setting the Y-axis belt tension 65

Attaching the digital gap indicator 66

Spacing the printhead to the drum 67

Aligning (timing) the cap/wipe/purge assembly drive belts 69

Setting the drum position encoder gap 71

Adjusting the transfix roller pressure springs 73

Adjusting the x-axis scale adjustment 74

Connecting the vacuum gauge to the printer 75

Resetting print engine NVRAM menu item 84

Clearing PostScript NVRAM menu item 85

Removing the main board 88

Removing the power supply 89

Removing the power control board 90

Removing the paper/drum heater 91

Remove the upper feed roller assembly (left side) 92

Removing the upper feed roller assembly (front) 93

Removing the drum transfix assembly (left side) 95

Removing the drum/transfix assembly (right side) 97

Marking the drum home flag sensor alignment 99

Removing the drum position sensor assembly 100

Plugging the reservoir holes 101

Removing the printhead 103

Removing the x-axis motor and drive assembly 104

Service Guide

Removing the Y-axis belt drive assembly 105

Removing the cap/wipe/purge assembly 107

Cabinet FRUs 111

Imaging FRUs 113

Paper path FRUs 115

Motors and fans FRUs 117

Circuit boards FRUs 119

Solenoids and clutches FRUs 121

Gears and belts FRUs 123

Sensors and flags FRUs 125

High-capacity Paper Tray 127

Print engine wiring diagram 145

Wire routing on the right side of the printer near right I/O board 146

Wire dressing above the x-axis drive 147

Vacuum hose dressing 148

Routing wiring on the left side of the printer 149

Wire dressing behind the printhead 150

Phaser 840 Color Printer

Tables

Installed RAM and printer capabilities 4

Tray switch sensor combinations 15

Rear panel DIP switch settings 19

Physical dimensions 20

Printer installation clearances 20

Functional specifications 21

Electrical specifications 22

Environmental specifications 23

Main board power-up self-test error codes 25

Front panel and fault history log error codes and messages 28

Motor and solenoid resistances 42

Hidden Service Menu 60

Cabinet FRUs 110

Imaging FRUs 112

Paper path FRUs 114

Motors and fans FRUs 116

Circuit board FRUs 118

Solenoid and clutches FRUs 120

Gears and belts FRUs 122

Sensors and flags FRUs 124

High-capacity Paper tray FRUs 126

Service tools 128

Supplies and accessories 128

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