Tektronix Phaser 740 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: Febuary 2000
063-3102-01
PHASER® 740 and 750
LASER PRINTERS

Copyright © 1998 by Tektronix, Inc., Wilsonville, Oregon. Printed in the United States
of America. All rights reserved. Contents of this publication may not be 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
SM
and TekColor Care
SM
are service marks of Tektronix, Inc.
Other marks are trademarks or registered trademarks of the companies with which
they are associated.
TE/mq/mm

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.
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. Aprotective 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
The Phaser 740 Color Printer 2
The Phaser 750 Color Printer 4
Phaser 740 printer RAM and printer capabilities 6
Phaser 750 printer RAM and printer capabilities 8
Print engine assemblies 10
The image processor board 13
Phaser 740 13
Phaser 750 14
Front panel 15
Rear panel 17
Test print button 17
Network card LEDs 18
Health LED (Phaser 740 only) 20
Media tray type sensing 20
Difference between Phaser 740 and 750 22
Specifications 23
Regulatory specifications 26
Error Codes and Messages 27
Error messages 27
Print engine error codes 27
Normal power-up self-tests 35
Troubleshooting 37
System power-up sequence 37
Print engine troubleshooting 38
Testing the print engine 38
Verifying printer operation by using its self-test print 39
Verifying power supply operation 39
Measuring power supply voltages 39
Inspecting the power supply fuses 41
Safety interlocks 41
Testing for a shorted motor 42
Media jams and the paper path 43
Media-based problems 43
Media problems 43
Multiple-sheet pick 44
The media skews passing through the paper path 44
Paper tray indicates empty when it is not 44
No paper feeder installed 45
No imaging unit installed 45

viii Phaser 740 and 750 Color Printers
Jams 46
Wrong media 46
Paper mis-picks at the paper tray 46
Paper jams midway in the paper feeder 46
Paper jams at the second bias transfer roller 47
Fuser jams 48
Eject jams 48
Multi-purpose tray feed jams 49
Jams in the duplex unit 49
Other problems 50
The printer continuously displays “Initializing” 50
No toner cartridge installed message when it is 50
No fuser installed message when it is 50
No fuser roll installed message when it is 51
Front door open when it is closed 51
Left-side door open message when it is not 51
High temperature error 52
Low temperature error 52
High voltage error 52
Thermistor open error 52
Front panel cycling between READY and WARMING UP 53
Erratic printer behavior 53
Installed RAM not recognized 53
Printing and print quality problems 54
Blank print 56
All-black print 56
Single color mottled or with non-uniform density streaks 57
Dark vertical line in print, single color 57
Vertical line in print, all colors 57
Vertical line or scratch in print, single color 58
Vertical line or scratch in print, all colors 58
Small, repeating light dot in one color in-line with each other 59
Single light, horizontal line in all the prints 60
Large, random light smudges 60
One or more dark vertical line in all colors 61
Dark, irregular, vertical streaks and smears on the entire page 62
One primary color faded or pale OR a single color has a dark vertical streak
62
Light, faded, pale prints 63
Single white spot appear in the same place on the print 64
Contamination of one color by another 64
Missing primary color 65
Mis-transfer, missing portions of toner 65
Dirty background 66
Stains on the back of the print 66
Ghosting 66
Unfused or partially fused printing 66
Image is skewed on the paper 67
No printing on edge of print 67
Image is not centered on the print when it should be 67

Service Guide
ix
The print is wrinkled 68
Macintosh printing problems 69
Image never prints 69
Image is rotated 90 degrees 69
Image prints in black-and-white 69
Printer isn’t in the Chooser 70
Windows printing problems 70
Image never prints 70
Interpreting the Supplies Page 71
Life remaining gauges 71
Date installed 71
Toner coverage 71
Print counts 71
Print count conversions 72
Service Tests and Adjustments 73
Required tools 73
Printing test prints on the Phaser 740 printer 74
Print service test prints 74
Printing the Configuration Page 74
Printing the demonstration pages 74
Printing the print engine’s test print 74
Printing test prints on the Phaser 750 printer 75
Printing the Diagnostic Test Pages and Solid Fill Test Page 75
Printing the Configuration Page 75
Printing the demonstration pages 75
Printing the print engine’s test print 75
Embedded pages (Phaser 750 printer only) 76
Printer self-diagnostics 77
Phaser 740 service tests 77
Phaser 750 service tests 80
Print engine calibration 84
Printer color correction 84
Manually setting color corrections 84
Phaser 740 84
Phaser 750 84
Calibrate for paper (Phaser 750 only) 86
Cleaning and Maintenance 87
Service preventive maintenance procedure 87
Recommended tools 88
Cleaning 88
Lubrication 89

x Phaser 740 and 750 Color Printers
Resetting NVRAM 91
Phaser 740 printer 91
Phaser 750 printer 91
Key FRU Disassembly 93
Printer cabinet 93
EMI shields 95
Cartridge selector/eject unit (right door) 96
Paper feeder and tray sensor board 98
Multi-purpose tray pick roller 99
Cork separator pad 100
Laser scanner 101
Power supply 102
Main motor 103
Paper feed motor 103
Toner cartridge drive motor 103
Cleaning board 103
Toner cartridge drive unit 104
Accumulator belt home position sensor 104
Left door open interlock switch 104
Temperature/humidity sensor board 105
Pre-exposure lamp 105
Pre-transfer lamp 105
Paper feed/fuser gear train 106
Tray guides 107
Engine control board 108
High-voltage board 109
Image processor board 110
Phaser 740 110
Phaser 750 111
FRU List 113
Supplies and accessories 125
Test Prints 131
Phaser 740 printer test prints 131
Phaser 750 printer test prints 132
Wiring Diagram 135