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: November 1999

071-0388-01

PHASER® 840aND 850

COLOR PRINTERS

Service Manual

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 Apersonal 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

Phaser 850 printer overview 4

Solid inks 5

About RAM upgrades 5

Memory considerations 6

Print engine assemblies 8

Combination sensors and their meanings 16

Media tray type sensing 16

The main board 17

Front panel 19

Rear panel 20

Phaser 840 and Phaser 850 printer differences 23

Specifications 24

Regulatory specifications 28

Error Codes and Messages 29

Rear panel LED error codes 29

Error messages 32

Troubleshooting 55

Front panel shortcuts 55

Access fault history 55

Set front panel language 55

Access service menu 55

Fast time to ready 55

Network Event Logs (Phaser 850) 56

System power-up sequence 57

No lights, no sound on power-up 59

Verifying main board CPU operation 59

Verifying print engine operation by printing its startup page 59

Verifying power supply operation 60

Measuring power supply voltages 60

Inspecting the power supply fuses 61

Testing for shorted drivers 62

Testing for a shorted motor 63

Testing motor and solenoid resistances 63

Testing the cap/wipe/purge vacuum system 63\

Phaser 840 and 850 Color Printers

Media jams and the paper path 64

Media-based problems 64

Paper-pick errors 64

Print transfer jams 65

Checking the process motor and drive train 66

Media skews passing through the paper path 66

Printing and print quality problems 67

Not printing 67

Streaks or lines across the print 67

Missing ink or light colored ink band running length of print 68

Color is uneven 68

Streaks or lines down the print 69

Scratches parallel to the long axis of printing, particularly with film 70

Printing too light or too dark 70

White portion of print is colored 71

Fuzzy text 72

Variation of density on second side of print 72

Ghost of first side image on second side of print 72

Poor primary color fills 73

Ghosting 74

Poor small text resolution 74

Vertical line appear wavy 75

Oil streaks on print 75

Incomplete image transfer to paper 76

Ink smears on first side of duplex print 77

Repeating print defects on print 77

Banding parallel to long edge of print 78

Wrinkling 78

Image is offset or cut off 79

Oil streaks on top of print 79

Poor ink adhesion, poor image durability 79

Evaluating the printhead and cap/wipe/purge system 80

Troubleshooting following cap/wipe/purge installation 85

Macintosh printing problems 88

Image never prints 88

Image is rotated 90 degrees 88

Image prints in black-and-white 88

Printer isn’t in the Chooser 89

Windows printing problems 89

Image never prints 89

Service Guide

vii

Adjustments 91

Fast time to ready 91

Bypass mode (manufacturing mode) 91

Cool down mode 91

Bypassing a “short menu” 92

Printing service test prints 92

Printing the Configuration Page 92

Hidden service menu 93

Selecting Duplex (2-sided) Oil Chase 94

Selecting Envelope Oil Chase 94

Center Image 94

Locking the printhead 95

Adjustments 96

Process belt tension adjustment 96

Exit roller drive belt tension adjustment 97

Y-axis belts tension adjustment (Phaser 840 printer) 98

Y-axis belts tension adjustment (Phaser 850 printer) 100

Printhead-to-drum spacing adjustment (Phaser 840 printer) 102

X-axis scale adjustment 105

Cap/wipe/purge assembly belt adjustments 106

Drum position encoder gap 108

Transfix roller pressure spring adjustment 110

Vacuum check 112

Cleaning and Maintenance 115

Cleaning 116

Cleaning Page (Phaser 840 printer only) 117

Vacuum 117

Drum temperature sensor 117

Maintenance 118

Maintenance roller 118

Waste tray 118

Lubrication 119

Inspection 120

Resetting NVRAM 121

viii

Phaser 840 and 850 Color Printers

Key FRU Removal and Replacement 125

Main board and its components 126

Power supply 128

Power control board 129

Upper feed roller assembly 130

Paper/drum heater 132

Drum/transfix assembly 133

Drum position sensor assembly (Phaser 840 printer) 138

Drum position sensor assembly (Phaser 850) 140

Printhead 142

X-axis motor and drive assembly 145

Y-axis belt drive assembly (Phaser 840 printer) 146

Y-axis belt drive assembly (Phaser 850 printer) 147

Cap/wipe/purge assembly (Phaser 840 printer) 148

Cap/wipe/purge assembly (Phaser 850 printer) 150

FRU List 153

High-capacity Paper Tray Assembly 170

Service tools 172

Supplies and accessories 173

Test Prints 177

Wiring Diagrams 191

Service Guide

Figures

The Phaser 850 printer (shown with optional High-capacity Paper Tray Assembly) 1

Internal features of the print engine 8

Circuit boards of the print engine (right front view) 9

Circuit boards of the print engine (left-rear view) 10

The printer’s I

C bus 11

Printhead maintenance system of the print engine 12

Sensors and switches on the right side of the print engine 13

Sensors and switches on the left side of the printer 14

Solenoids and clutches on the print engine 15

Features of the Phaser 840 printer main board 18

Features of the Phaser 850 printer main board 18

Printer front panel 19

Phaser 840 printer rear panel 22

Phaser 850 printer rear panel 22

Attaching the service load connector to J250 62

Faceplate showing blade wipe with no drops, smudges or streaks 80

Faceplate showing streaks and smudges from a poor wipe 81

Connecting the vacuum gauge to the printer 82

Maintenance tray showing good purge 84

Damaged printhead data cable 86

Inadvertently disconnected thermistor cable connector 87

Setting process belt tension 96

Setting exit roller drive belt tension 97

Setting the Y-axis belt tension 99

Setting the Y-axis belt tension 101

Attaching the digital gap indicator 103

Spacing the printhead to the drum 104

Adjusting the x-axis scale adjustment 105

Aligning (timing) the cap/wipe/purge assembly drive belts 107

Setting the drum position encoder gap 109

Adjusting the transfix roller pressure springs 111

Connecting the vacuum gauge to the printer 112

Lubricating the transfix cam 119

Resetting print engine NVRAM menu item 122

Clearing PostScript NVRAM menu item 123

Removing the Phaser 840 printer main board 126

Removing the Phaser 850 printer main board 127

Removing the power supply 128

Removing the power control board 129

Phaser 840 and 850 Color Printers

Remove the upper feed roller assembly (left side) 130

Removing the upper feed roller assembly (front) 131

Removing the paper/drum heater 132

Removing the drum transfix assembly (left side) 134

Removing the drum/transfix assembly (right side) 136

Marking the drum home flag sensor alignment 138

Removing the drum position sensor assembly (Phaser 840 printer) 139

Marking the shaft for drum home alignment 140

Removing the drum position sensor assembly (Phaser 850 printer) 141

Plugging the reservoir holes 142

Removing the printhead 143

Removing the x-axis motor and drive assembly 145

Removing the Y-axis belt drive assembly (Phaser 840 printer) 146

Removing the Y-axis belt drive assembly (Phaser 850 printer) 147

Removing the cap/wipe/purge assembly (Phaser 840 printer) 149

Removing the lower cap/wipe/purge retainer clip 150

Removing the lower cap/wipe/purge retainer clip 151

Removing the cap/wipe/purge assembly (Phaser 850 printer) 152

Cabinet FRUs 155

Imaging FRUs 157

Paper path FRUs 159

Motor and fan FRUs 161

Circuit board FRUs 163

Solenoid and clutch FRUs 165

Gear and belt FRUs 167

Sensor and flag FRUs 169

High-capacity Paper Tray 171

Print engine wiring diagram 191

Wire routing on the right side of the printer near right I/O board 192

Wire dressing above the x-axis drive 193

Vacuum hose dressing 194

Routing wiring on the left side of the printer 195

Wire dressing behind the printhead 196

Service Guide

Tables

Installed RAM and printer capabilities 6

Tray switch sensor combinations 16

Rear panel DIP switch settings 21

Summary of differences between Phaser 840 and Phaser 850 23

Physical dimensions 24

Printer installation clearances 24

Functional specifications 25

Electrical specifications 26

Environmental specifications 27

Main board power-up self-test error codes 29

Front panel and fault history log error codes and messages 32

Motor and solenoid resistances 63

Hidden Service Menu 93

Cabinet FRUs 154

Imaging FRUs 156

Paper path FRUs 158

Motor and fan FRUs 160

Circuit board FRUs 162

Solenoid and clutch FRUs 164

Gear and belt FRUs 166

Sensor and flag FRUs 168

High-capacity Paper Tray FRUs 170

Service tools 172

Supplies and accessories 173

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