Tektronix Z780N - Phaser 780 Color Laser Printer 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: September 1999

063-3041-01

PHASER® 780

COLOR LASER PRINTER

Service Reference Guide

Users safety summary

Terms in

CAUTION Conditions that can result in damage to the product.

manual:

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

CAUTION A personal injury hazard exists that may not be

product:

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:

Laser 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.

Donot 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.

This product is certiﬁed under IEC 825 as a Class 1 Laser Product.

9008-78

DANGER:

Invisible laser radiation

when open and interlock

defeated.

AVOID DIRECT

EXPOSURE TO BEAM.

CAUTION:

Invisible laser radiation

when open and

interlocks defeated.

AVOID DIRECT

EXPOSURE TO BEAM.

VORSICHT:

Unsichtbare Laserstrahlung,

wenn Abdeckung geöffnet

und Sicherheitsverriegelung

überbrückt.

NICH DEM STRAHL

AUSSETZEN.

ATTENTION:

Rayonnement laser invisible

dangereux en cas

d'ouverture et lorsque

la sécurité est neutralisée.

EXPOSITION DANGEREUSE

AU FAISCEAU. Class 3B

PELIGRO:

Cuando se abre y se

invalida el bloqueo, se

producen radiaciones

invisibles de láser.

EVITESE LA

EXPOSICION

DIRECTA A TALES

RAYOS.

VARNING:

Osynlig laser-

strálning när denna

del är öppnad och

spärrar är

urkopplade.

STRÅLEN

ÄR FARLIG.

VARNING:

Osynlig laserstrálning

när denna del är

öppnad och spärrar är

urkopplade.

BETRAKTA EJ

STRÅLEN.

VAROI:

Näkymätön

avattaessa ja

suojalukitus

ohitettaessa olet

alttiina lasersäteilylle.

ÄLÄ KATSO

SÄTEESEN.

ADVARSEL:

Usynlig laserstràling

ved abning når

sikkerhedsafbrydere

er ude af funktion.

UNDGÅ UD

ÆTTELSE FOR

STRÅLING.

ADVARSEL:

Usynlig laserstraling

nar deksel åpnes og

sikkerhedslas brytes.

UNNGÅ

EKSPONERING

FOR STRÅLEN.

PJQT4521ZA

Service Guide

vii

Contents

General Information 1

Phaser 780 overview 2

Memory considerations 3

Print engine assemblies 5

The image processor 10

Front panel 11

Rear panel 12

Network card LEDs 12

Specifications 14

Regulatory specifications 17

Safety 17

EMC 17

Energy Star certification 17

Error Codes and Messages 19

Troubleshooting 39

System power-up sequence 39

Print engine troubleshooting 40

Printer will not power up 40

Erratic printer operation 41

Making a print engine only test print 42

Printing and print quality problems 43

Initial checks and actions 43

Light (undertone) prints 44

Blank prints 45

Monochrome prints 46

Black prints 47

One color is faded 47

Missing band in direction of paper travel 48

Missing bands in parallel to the leading edge 49

Streaks in direction of paper travel 51

Streaks parallel with the leading edge 52

Banding 53

Edge of print is wrinkled with an area of ragged discoloration. 53

Random missing spots 54

Random spotting 55

Repetitive mark appears on each print 56

Residual image or ghosting 56

Background contamination 57

Unfused image or image easily rubs off of page 58

Toner on back of print 58

viii

Phaser 780 Color Printer

Print is mottled 59

Image mis-registered on paper 60

Color layer not correctly registered 60

Color representation not correct 61

Oil stain or gloss variation on print 61

Random spotting 62

Media jams and the paper path 63

Skewed image 63

Damaged prints 64

Inoperative lower tray feeder 65

Power problems 65

All front panel indicators remain off. The printer does not initialize

upon power-up 65

Front panel indications 66

Media tray indicates missing or empty when it is not 66

Macintosh printing problems 66

Image never prints 66

Image prints in black-and-white 66

Image is rotated 90 degrees 67

Windows printing problems 67

Image never prints 67

Blue color on the screen is printing too purple. 67

Printing from Windows 3.1 produces the message “Problem writing

device LPT1: Cancel or Retry”. 68

Workstation printing problems 68

Image never prints 68

Running built-in diagnostics 69

Adjustments 73

Printing test prints 73

Print service test prints 73

Printing the configuration page 73

Printing the demonstration pages 73

Print engine calibration 74

Adjusting for impulse banding 74

Cleaning and Maintenance 77

Service preventive maintenance procedure 77

Recommended tools 77

Cleaning 78

Resetting NVRAM 79

Service Guide

Key FRU Disassembly 81

Paper feeder 82

Feeder registration chute 83

Feeder registration clutch 84

Registration brake clutch 85

Feeder metal registration roller 86

Feeder rubber registration roller 87

Feeder pre-registration clutch 88

Feeder pre-registration rollers 89

Paper-pick turn roller 91

Paper feed drive gear train 92

Paper-feed motor 93

Multi-purpose tray roller assembly 94

Multi-purpose tray pick rollers 95

Auto-density calibration sensor 97

Developer assembly 99

Developer clutch 101

Developer tie plate 102

Toner/developer dispense motor 104

Carousel assembly 105

Carousel motor 107

Carousel motor board 108

Carousel sensor 109

Laser unit 110

Erase lamp rail assembly 112

Erase lamp 114

Process drive unit 115

Waste auger assembly 117

Accumulator belt assembly 119

Accumulator belt cleaner assembly 121

Second bias transfer roller assembly 122

Second bias transfer roller cam assembly 123

Fuser assembly 125

Fuser drive gear train 126

Lower exit assembly 128

Full stack sensor 130

Low voltage power supply 131

High voltage power supply 132

Image processor 133

Image processor chassis 134

Print engine control board 135

Phaser 780 Color Printer

FRU List 137

Supplies and accessories 176

Test Prints 179

Wiring Diagrams 185

Service Guide

Figures

The Phaser 780 printer (shown with optional Lower Tray Assembly) 1

Internal features of the print engine 5

Circuit boards of the print engine 6

Motors of the print engine 7

Sensors and switches on the print engine 8

Solenoids and clutches on the print engine 9

Features of the image processor board 10

Printer front panel 11

Printer rear panel with the optional Ethernet card 13

Adjusting for impulse banding 75

Removing the paper feeder 82

Removing the registration chute 83

Removing the registration clutch 84

Removing the registration brake clutch 85

Removing the metal registration roller 86

Removing the rubber registration roller 87

Removing the feeder pre-registration clutch 88

Removing the feeder pre-registration roller 90

Removing the paper-pick turn roller 91

Removing the paper-feed drive gear train 92

Removing the paper-feed motor 93

Removing the multi-purpose tray roller assembly 94

Removing the multi-purpose tray pick rollers 96

Removing the auto-density calibration sensor 98

Removing a developer assembly 100

Removing the developer clutch 101

Removing the developer tie plate 103

Removing the toner/developer dispense motor 104

Removing the carousel assembly 106

Removing the carousel motor 107

Removing the carousel motor board 108

Removing the carousel sensor 109

Removing the laser unit 111

Removing the erase lamp rail assembly 113

Removing the erase lamp 114

Removing the process drive unit 116

Removing the waste auger assembly 118

Removing the accumulator belt assembly 120

Removing the accumulator belt cleaner assembly 121

Removing the second bias transfer roller assembly 122

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