Tektronix Z740/N - Phaser 740 Color Laser Printer, Phaser 740, Phaser 740L Service Manual

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PHASER® 740 and 740L LASER PRINTERS

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 1999 063-3102-00

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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

and TekColor Care

are service marks of Tektronix, Inc.

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

September 1998. First printing

November 1998. Changed pages: 88, 94, 96, 106, 108

May 1999. Changed pages: 5, 94

TE/mq/mm

Page 3

Users safety summary

Terms in manual:

Power source:

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:

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.

Safety instructions:

product into a power source.

CAUTION Conditions that can result in damage to the product. WARNING Conditions that can result in personal injury

or loss of life.

For 110 VAC printers, Do not apply more than 130 volts RMS between

Avoid electric shock by contacting a qualiﬁed service technician

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.

Read all installation instructions carefully before you plug the

Terms on product:

Care of product:

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:

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

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.

Disconnect the power plug by pulling the plug, not the cord.

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

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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:

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

If the product loses the ground connection, usage of knobs and controls

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Service safety summary

For qualiﬁed service personnel only: Do not service alone:

Do not perform internal service or adjustment of this product

Refer also to the preceding Users Safety Summary.

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.

DANGER:

Invisible laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM.

PELIGRO:

Cuando se abre y se invalida el bloqueo, se producen radiaciones invisibles de láser. EVITESE LA EXPOSICION DIRECTA A TALES RAYOS.

CAUTION:

Invisible laser radiation when open and interlocks defeated. AVOID DIRECT EXPOSURE TO BEAM.

VARNING:

Osynlig laserstrálning när denna del är öppnad och spärrar är urkopplade. STRÅLEN ÄR FARLIG.

VORSICHT:

Unsichtbare Laserstrahlung, wenn Abdeckung geöffnet und Sicherheitsverriegelung überbrückt. NICH DEM STRAHL AUSSETZEN.

VAROI:

Näkymätön avattaessa ja suojalukitus ohitettaessa olet alttiina lasersäteilylle. ÄLÄ KATSO SÄTEESEN.

ATTENTION:

Rayonnement laser invisible dangereux en cas d'ouverture et lorsque la sécurité est neutralisée. EXPOSITION DANGEREUSE AU FAISCEAU.

VARNING:

Osynlig laserstrálning när denna del är öppnad och spärrar är urkopplade. BETRAKTA EJ STRÅLEN.

ADVARSEL:

Usynlig laserstràling ved abning når sikkerhedsafbrydere er ude af funktion. UNDGÅ UD ÆTTELSE FOR STRÅLING.

Class 3B

ADVARSEL:

Usynlig laserstraling nar deksel åpnes og sikkerhedslas brytes. UNNGÅ EKSPONERING FOR STRÅLEN.

PJQT4521ZA

9008-78

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Contents

General Information 1

The Phaser 740 Color Printer 2

RAM and printer capabilities 4 Print engine assemblies 6 The image processor board 9

Front panel 10 Rear panel 12

Network card LEDs 12

Test print button 13

Health LED 14

Media tray type sensing 14 Specifications 16

Regulatory specifications 19

Error Codes and Messages 21

Error messages 21 Print engine error codes 21

Normal power-up self-tests 29

Troubleshooting 31

System power-up sequence 31 Print engine troubleshooting 32

Testing the print engine 32

Verifying printer operation by using its self-test print 33

Verifying power supply operation 33

Measuring power supply voltages 33 Inspecting the power supply fuses 35 Safety interlocks 35 Testing for a shorted motor 37

Media jams and the paper path 37

Media-based problems 37

Media problems 37 Multiple-sheet pick 38 The media skews passing through the paper path 38 Paper tray indicates empty when it is not 38 No paper feeder installed 39 No imaging unit installed 39

Service Guide

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Jams 39

Paper mis-picks at the paper tray 39 Paper jams midway in the paper feeder 40 Paper jams at the second bias transfer roller 40 Fuser jams 41 Eject jams 42 Multi-purpose tray feed jams 42 Jams in the auto-duplex unit 43

Other problems 43

The printer continuously displays “Initializing” 43 No toner cartridge installed message when it is 43 No fuser installed message when it is 44 No fuser roll installed message when it is 44 Front door open when it is closed 44 Left-side door open message when it is not 45 High temperature error 45 Low temperature error 45 High voltage error 46 Thermistor open error 46 Front panel cycling between READY and WARMING UP 46 Erratic printer behavior 46 Installed RAM not recognized 46

Printing and print quality problems 47

Blank print 47 All-black print 47 Missing primary color 48 Light print 48 Repeated spots or lines on print in-line with each other 49 Dark vertical line in print 49 White horizontal line or band in all the colors of a print 49 Vertical lines in the print 50 Dirty background 50 Mis-transfer, missing portions of toner 50 Dark, irregular steaks in all colors 50 Ghosting 51 Unfused or partially fused printing 51 Image is skewed on the paper 51 Stains on the back of the print 51 No printing on edge of print 52 Image is not centered on the print when it should be 52 The print is wrinkled 52

Macintosh printing problems 53

Image never prints 53 Image prints in black-and-white 53 Image is rotated 90 degrees 54 Printer isn’t in the Chooser 54

Windows printing problems 54

Image never prints 54

Service Tests and Adjustments 55

Phaser 740 Color Printer

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Required tools 55 Printing test prints 56

Print service test prints 56 Printing the Configuration Page 56 Printing the demonstration pages 56 Printing the print engine’s test print 56

Printer self-diagnostics 57

Service tests 57

Print engine calibration 60 Printer color correction 60

Manually setting color corrections 60

Cleaning and Maintenance 63

Service preventive maintenance procedure 63 Recommended tools 64 Cleaning 64

Lubrication 65

Resetting NVRAM 67

Key FRU Disassembly 69

Printer cabinet 69 EMI shields 71 Cartridge selector/eject unit (right door) 72 Paper feeder and tray sensor board 74 Multi-purpose tray pick roller 75 Cork separator pad 76 Laser scanner 77 Power supply 78 Main motor 79 Paper feed motor 79 Toner cartridge drive motor 79 Toner cartridge drive unit 80 Accumulator belt home position sensor 80 Left door open interlock switch 80 Temperature/humidity sensor board 81 Pre-exposure lamp 81 Pre-transfer lamp 81 Gear train 82 Tray guides 83 Engine control board 84 High-voltage board 85 Image processor board 86

FRU List 87

Supplies and accessories 98

Service Guide

Page 9

Test Prints 103

Wiring Diagram 113

Phaser 740 Color Printer

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Figures

The Phaser 740 Color Printer 1 Print engine major components 6 Print engine components (continued) 7 Print engine sensor, switch and solenoid locations 8 Features of the image processor board 9 The front panel 11 The Phaser 740 rear panel 13 Tray switch sensors and actuators 15 Measuring the DC voltages (test points) 34 Door safety interlock switches 36 Manual color correction reference print 61 Removing cabinet covers 69 Removing cabinet covers 70 Removing the EMI shields 71 Removing the cartridge selector/eject unit 73 Removing the paper feeder 74 Removing the multi-purpose tray pick roller 75 Removing the cork separator pad 76 Removing the laser scanner and driver board 77 Removing the power supply 78 Removing the main motor, paper-feed motor, toner cartridge drive motor and cleaning

board 79 Removing the toner cartridge drive unit, home position sensor and the left door interlock

switch 80 Removing the temperature/humidity sensor board 81 Removing the pre-exposure lamp and pre-transfer lamp 81 Removing the gear train 82 Removing the tray guides 83 Removing the engine control board 84 Removing the high-voltage board 85 Removing the image processor board 86 Cabinet FRUs 88 Cabinet FRUs 89 Motor and fan FRUs 91 Sensor, switch and flag FRUs 93 Circuit board and electronic FRUs 95 Imaging and paper feed component FRUs 97 Wiring diagram 113

Service Guide

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Tables

Installed RAM and printer capabilities 4 Tray switch sensor combinations 14 Physical dimensions 16 Printer clearances 16 Functional specifications 17 Electrical specifications 18 Environmental specifications 18 Print engine service error codes 21 Normal power up error codes 29 Print engine service test descriptions 57 FRU parts list of the printer cabinet 88 FRU part list of the printer cabinet 89 Motors, drive units and fans 90 Sensors, switches and flags 92 Circuit board and electronics 94 Imaging and paper feed components 96 Kits and other hardware 98 Supplies and accessories 98

Phaser 740 Color Printer

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General Information

PAPER

This service guide contains information useful for troubleshooting, repairing,

adjusting, and maintaining a Tektronix Phaser

740 and 740L Color Printer. This manual includes troubleshooting guides, adjustment procedures and a ﬁeld replaceable units (FRU) 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 a complete understanding of the product, we recommend participation in Phaser 740 service training.

The Phaser 740 Color Printer

3102-01

Service Guide

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The Phaser 740 Color Printer

The Phaser 740 Color Printer combines a color laser, continuous-tone print engine with an image processor supporting Adobe’s PostScript Level 3 page description language. The image processor features a bi-directional parallel interface and a 10baseT Ethernet port for host communication. Optional network adapter cards to the image processor allow the printer to communicate on networks using LocalTalk, Ethernet 100baseT or Token Ring protocols. The Ethernet network card supports EtherTalk 100baseT, Novell and TCP/IP. With the Token Ring network card, the printer supports Token Ring protocols. With 32 Mbytes of RAM installed, the printer supports the color PCL5C printer language too.

The printer is available in four conﬁgurations:

■

The

Phaser 740L

customer-upgraded to be a color printer. It prints at a resolution of 600 x

600. It is equipped with 16 Mbytes of RAM which can be supplemented with an additional RAM DIMM. The printer contains 136 standard, built-in fonts. The Phaser 740L is identical to the Phaser 740 except is set to only use a black toner cartridge. It features a removable plate which blocks out the locations of the color cartridges.

■

The

Phaser 740 Base

supplemented with one or two additional 16-, 32-, 64- and 128-Mbyte RAM DIMMs; maximum usable capacity is 80 Mbytes. The printer contains 136 standard, built-in fonts. The printer contains 136 standard, built-in fonts. The Phaser 740 Base prints at a resolution of 600 x 600 dots-per-inch.

is a monochrome version of the printer which can easily be

comes standard with 32 Mbytes of RAM which can be

■

The

Phaser 740 Plus

includes 32 Mbytes of additional memory (64 Mbytes total) and a SCSI interface board. The presence of the SCSI board (and the extra memory) enables the printer to print at higher resolutions 1200 x 1200 (Premium mode) dots-per-inch and also support image pipelining for greater throughput, a print collation mode, and a “check print before proceeding with job” mode. The printer contains 136 standard, built-in fonts.

■

The

Phaser 740 Extended

(a factory-only option) features a different ROM SIMM than the other printers. It includes 128 Mbytes total memory, SCSI port, 1200 x 1200 color printing, check print mode, print job collation (requires hard drive), copystation support and print pipelining.

The color printers support a 5.3 page-per-minute, composite-black printing “Fast Color” mode which prints at 600 x 600 dpi using three passes, cyan, magenta and yellow, to produce an image instead of the usual four passes, cyan, magenta, yellow and black. Each printer also features “Presentation” mode printing in which a paper print is printed with the color settings of a transparency print. Presentation mode produces the smoothest and brightest large-area ﬁlls. The printer prints in monochrome at 16 prints-per-minute.

Phaser 740 Color Printer

Page 14

Print speeds depend on the chosen resolution and selected media. For resolutions of 600 x 600 (standard), in color, the printer prints at 4 pages per minute (ppm) on paper. Monochrome printing (Fast Monochrome) is at 16 ppm on paper. Transparency ﬁlm printing is always 2 ppm. For 1200 x 1200 (premium) dpi color printing, the printer color prints at 2 ppm. Monochrome printing is at 8 ppm. The printer prints 600 x 600 dpi, composite black (CMY) draft prints at a rate of 5.3 pages-per-minute.

The plus and extended features option includes a SCSI-compatible interface to connect to an external hard disk drive for additional font storage. The hard disk drive is also required for print collation of multiple copy multi-page prints. A copy unit can also be connected to the printer’s SCSI port to give the printer the ability to optically copy color images. An factory-only, internal IDE hard drive can be installed in the printer in place of the network card.

The printers support printing on A-, A4- and Legal-sized paper and transparency ﬁlm from separate A or A4- or Legal-size trays. An optional two-tray second feeder (called the Lower Tray Assembly) is available. The printer features a built-in multi-purpose tray from which specialty media, cardstock and envelopes can be fed. The printer also supports manual feeding using the multi-purpose tray.

An optional auto-duplex unit allows the printer to automatically create double-side prints. The duplex unit takes the place of the main (top) tray. The duplex unit requires using the optional two-tray second feeder as a paper source. The duplex unit upgrade kit includes the optional two-tray feeder. When printing double-sided, print times are generally doubled. Double-sided monochrome printing is at 4 ppm, doubleside color at 2 ppm.

After being idle for the selected amount of time the printer switches into its Energy Star mode where it consumes less than 45 watts of power. It “awakens” upon receiving data at any of its ports.

Service Guide

Page 15

RAM and printer capabilities

The printer features two DIMM connectors which accept both 16-, 32-, 64-, and 128Mbytes RAM DIMMs. The printer can use off-the-shelf RAM meeting these speciﬁcations:

■

168-pin DIMM

■

Synchronous DRAM

■

3.3 volt

■

9 nsec speed

■

Valid on-board Serial Presence Detect ROM.

The Conﬁguration Page lists the amount of installed RAM and the details; such as type, parity, size, and manufacturer, about the DIMM installed in each slot.

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

With more memory the printer gains the capabilities of printing at higher resolutions, printing without having to use image compression (which trades off less installed RAM for longer image processing time) and dual frame buffers for printing one image while processing a second image (which gives greater printing throughput). With additional RAM memory the printer’s capabilities increase as detailed in the following table:

Installed RAM and printer capabilities

Feature 16 Mbytes 32 Mbytes 64 MBytes 80 Mbyte

600 x 600 dpi Color/mono Color/mono Color/mono Color/mono 1200 x 1200 dpi Black and white

only

Pipelining Yes, if SCSI

Frame buffer 1 Letter size

image with compression

Check print Yes, if SCSI

Black and white only

1 Letter size image with no compression

Color and black and white

board installed 2 Letter-size

images with compression

board installed

Color and black and white

Yes, if SCSI board installed

2 Letter-sized frame buffers with no image compression

Yes, if SCSI board installed

Collation (requires hard drive)

Phaser 740 Color Printer

Yes, if SCSI board installed

Page 16

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

For example:

Installed RAM: 96 Mbytes Mem slot 1: SDRAM/parity/64 MB/KMM366S824AT Mem slot 2: empty

This is a list of DRAM SIMMs that are branded for use by Tektronix at the time this guide was published:

Size

Maker Part Number

16 Mbyte Samsung KMM366S203BT

32 Mbyte Samsung KMM366S403BT

32 Mbyte Samsung KMM3665403CTL-G0

64 Mbyte Samsung KMM366S824AT

64 Mbyte Samsung KMM3665823BTL-G0

128 Mbyte Samsung KMM366S1623AT

32 Mbyte Smart Module SM564043574N6AA

64 Mbyte Smart Module SM564088574N6AA

32 Mbyte NEC MC-454AD645F-A10B

64 Mbyte NEC MC-454CB645FA-A10B

128 Mbyte NEC MC-4516CD645FZ-A10B

16 Mbyte Micron Tech. MT8LSDT264AG-66CL2

32 Mbyte Micron Tech. MT16LSDT264AG-10BC4

32 Mbyte Micron Tech. MT16LSDT264AG-662C1

32 Mbyte Micron Tech. MT16LSDT464A6-662xx

64 Mbyte Micron Tech. MT8LSDT864AG-662D3

64 Mbyte Micron Tech. MT8LSDT864AG-10BD2

64 Mbyte Micron/Crucial CT8M6454D10-MBT66LP

128 Mbyte Micron Tech. MT16LSDT1664AG-662DT

Service Guide

Page 17

Print engine assemblies

Pre-exposure lamp

Imaging unit

Paper feeder

Main charger corona unit

Ozone filter

Toner level sensor board

Laser scanner

Black toner cartridge

Cyan toner cartridge

Yellow toner

Magenta

cartridge

toner cartridge

Pre-transfer lamp

Print engine major components

Fuser

Paper tray

Toner cartridge selector/paper exit unit (right door)

3102-02

Phaser 740 Color Printer

Page 18

Toner cartridge motor

Power supply unit

Engine control board

Toner cartridge drive unit

Laser driver board

Ozone fan

High voltage board

Image processor board

Fuser fan

Cleaning board

Paper feed motor

Main motor

Temperature/humidity sensor board

Print engine components (continued)

Interconnect board

Lower door open sensor

3102-03

Service Guide

Page 19

Toner level sensors (transmitters)

Accumulator belt

home position sensor

Main charge grid (Scorotron charger) sensor

Multi-purpose tray feed sensor

Toner level sensors (receivers) are mounted inside the toner cartridge driver unit

Front right door opened switch

Transfer roller position sensor

Left door opened switch

Fuser-exit sensor

Output tray full sensor

Power switch

Aligning

sensor

Paper tray

type sensors

Paper-empty sensor

Paper-exit sensor

3102-04

Print engine sensor, switch and solenoid locations

The photoconductive belt position sensor is not illustrated. This optical sensor marks the home position of the photoconductive belt. It is mounted inside the customerreplaceable imaging unit.

Phaser 740 Color Printer

Page 20

The image processor board

Font ROM DIMM

PostScript code ROM DIMM

CPU

Network Card

RAM DIMM 2

RAM DIMM 1

NV RAM

Boot ROM

Image processor board

SCSI riser board

Features of the image processor board

Real Time clock

3102-41

Service Guide

Page 21

Front panel

These front panel features are found on the printer:

■

A two-line, 24-character LCD and two LEDs

■

Four push buttons

LCD

The LCD serves two purposes: displaying current image processor and print engine status information and displaying an interactive menu. Status information includes image processor status such as Print engine status includes messages such as

of Toner

. The interactive menu can only be entered while the print engine and

Ready, Receiving data

Out of paper, Paper Jam

image processor are idle. The interactive menu allows the user to review and change certain NVRAM, I/O ports and peripheral parameters.

and

Printing

, and

Out

Buttons

Button 1, the left-most button labeled the Exit key, cancels an operation while in the interactive menu. The functions of Buttons 2, 3 and 4 are deﬁned by the particular menu or function being displayed on the LCD display. The bottom row of the LCD labels the current function of each button.

In addition, pressing the buttons as you turn on the printer enables certain diagnostic modes:

■

Pressing and holding Button 1, as you turn on the printer, skips power-up diagnostics (except for a brief kernel test) and proceeds to PostScript startup.

■

Pressing and holding Button 3, as you turn on the printer, executes interactive service tests. Refer to “Service tests” on page 57.

The topic, “Resetting NVRAM” on page 67 explains how to use the front panel buttons to reset the printer’s NVRAM to its factory default values.

Phaser 740 Color Printer

Page 22

LEDs

The

boards.

Power

LED indicates the printer has +5 VDC available for its logic control

The

■

Error

Off

Toner

Blinking

LED has three meanings:

indicates that no errors have been detected.

indicates a warning to the user. An explanatory message, such as

, is displayed on the LCD.

indicates an error has been detected. An error message, such as,

Paper Jam at Output

Exit

Low

, is displayed on the LCD.

Power Error

Button 1

The front panel

Button 2

Button 3

Button 4

3102-30

Service Guide

Page 23

Rear panel

Connectors

The rear panel of the printer features the host interface connectors:

■

Bi-directional parallel (high-density connector).

■

Twisted Pair10baseT Ethernet connector. RX indicator (green); the network card is receiving data. The LED is being received. If the LED is

on steady

, then a problem (probably hardware)

off steady

while no data is

has occurred at the network hub.

■

SCSI high-density connector (external hard disk drive or optical scanner only).

With the addition of a network card, the printer can feature either of these groups of connectors:

■

ThinNet (100base2) and Twisted Pair (100baseT) Ethernet connectors. RX indicator (green);

off steady

while no data is being received. If the LED is on

blinks

while the network card is receiving data. The LED

(probably hardware) has occurred at the network hub.

steady

blinks

while

, a problem

■

LocalTalk connector.

■

Unshielded Twisted Pair (10baseT) and shielded Twisted Pair (DB-9) Token Ring connectors.

Network card LEDs

The Ethernet network card has two LED indicators:

■

TX indicator (yellow); blinks while data is transmitted to the host. The LED is off while no data is being sent.

■

Twisted Pair (100baseT). RX indicator (green); is receiving data. The LED is LED is

off steady

, then a problem (probably hardware) has occurred at the

on steady

while no data is being received. If the

network hub.

ThinNet (100base2) receiving data. The LED is LED is

on steady

RX indicator (green);

off stead

y while no data is being received. If the

, then a problem (probably hardware) has occurred at the

network hub.

blinks

while the network card

blinks

while the network card is

■

TP Link. On steady indicates good circuit to nearest port; off indicates no circuit.

■

100 MBS. Ethernet speed is 100 MBS when lit.

Note

Do not use both Ethernet connectors at the same time. With a Ethernet or Token Ring network card installed, the built-in 10baseT port is disabled.

Phaser 740 Color Printer

Page 24

The Token Ring network card has two LED indicators:

■

Connection (yellow);

blinks

Ring, Ring,

■

Ring Speed (green); off when the card is set for 4 megabits-per-second

while the printer is attempting to insert itself into the Token

when the printer is properly inserted in the ring.

off

when the printer is not inserted into the Token

(MBPS), on when the card is set for 16 MBPS.

■ When both LEDs blink, a network card failure has occurred.

The printer also support an internal IDE hard drive in place a a network card as a part of a factory installed option.

Slot for network card or IDE hard drive

10baseT Ethernet

INS

10Base2

LocalTalk®

Mbs

UTP

10/100Base-TX

100

Mbs

LINK

Series B

Ethernet Card

PhaserShare

Ethernet card

Series B

PhaserShare

LocalTalk Card

LocalTalk card

STP

Series B

PhaserShare

Token Ring Card

Token Ring card

IDE Internal Hard Drive

SCSI

Parallel

3102-05

The Phaser 740 rear panel

Test print button

In the center of the rear cabinet panel is the test print button. Pressing this button while the printer is idle causes the print engine to print a built-in test print. The print consists of a ﬁeld of thin horizontal lines. The print is made independently of the image processor board. Hold in the test button for at least 4 seconds before releasing, or until you hear the print process begin. The print demonstrates that the print engine can print (independently of the image processor); it has no use for determining print quality.

Note

The Test Print button will not make a test print if the auto-duplex unit is installed since the Test Print function defaults to the upper tray.

Service Guide

Page 25

Health LED

A health LED indicates the status of the image processor board. The health LED is mounted on the image processor board and is viewable through a small hole in the rear panel. Once the PostScript code is loaded into memory and the image processor is initialized and running, the image processor blinks the LED at a one-second rate.

■ Blinking (at a steady rate): The printer is operating normally. The LED

blinks irregularly during power-up self-diagnostics.

If a soft error occurs, the image processor board operates, but at a reduced capacity. Soft failures include failure of expansion memory DIMMs or any of the interface ports. When a soft error occurs, the printer automatically prints a startup page listing the error.

■ On or Off: A hard error condition has occurred that would keep the image

processor board from operating.

Media tray type sensing

The combinations of the three tray sensors “tell” the print engine what type of tray is installed. The tray sensors are located on the left-side interior of the paper tray slot. Sensor actuators are attached to the bottom end of the tray to close the appropriate sensor. There are six tray types:

■ Letter (A-size) paper

■ Letter (A-size) transparency ﬁlm

■ Metric Letter (A4-size) paper

■ Metric Letter (A4-size) transparency ﬁlm

■ Legal-size paper

■ Auto-duplex unit

Tray switch sensor combinations

Left switch Middle switch Right switch Tray type

Closed Open Open Letter (A-size) paper Closed Closed Open Letter (A-size) transparency ﬁlm Open Open Closed Metric Letter (A4-size) paper Open Closed Closed Metric Letter (A4-size) transparency

ﬁlm Open Closed Open Legal size paper Closed Open Closed Auto-duplex unit

Phaser 740 Color Printer

Page 26

Sensor actuators

Middle

Left

Tray sensors

Right

Tray switch sensors and actuators

3102-31

Service Guide

Page 27

Speciﬁcations

Physical dimensions

Dimensions Speciﬁcation

Height: 46.3 cm (18.2 in.) With Lower Tray Assembly: 68.6 cm (27 in.) Width: 50.73 cm (20 in.) With output tray: 78.2 cm (30.8 in.) Depth: 49.2 cm (19.4 in.) Weight: Approximately 47.5 kgs (104.6 lbs.) with consumables installed.

Approximately 31.9 kgs (70.2 lbs.) without Lower Tray Assembly.

Printer clearances

Clearances Speciﬁcation

Top: 7.6 cm (3 in.) Left: 7.6 cm (3 in.) Right: 10.2 cm (4 in.) for handling the paper tray Front: Unlimited for removal of consumables Rear: 15.3 cm (6 in.) for connecting computer cable and power cord Bottom: No obstruction under printer that could block its cooling vents. Mounting surface

ﬂatness:

Within 2 degrees of horizontal with all four feet in contact with the table surface.

Phaser 740 Color Printer

Page 28

Functional speciﬁcations

Characteristic Speciﬁcation

Printing process Electro-photographic, four color (CMYK) transfer printing Color medium Four toner cartridges each contain one of four colors: cyan, magenta,

yellow or black. The toner is a nonmagnetic, monocomponent contact medium.

Addressability Standard, Fast Color and Presentation

mode: 600 x 600 dots-per-inch text and graphics Premium mode: 1200 x 1200 dpi text and graphics

Printing speed (A, A4, Legal paper)

Minimum printing margins

Usable paper Tray: A-size (letter), A4-size (Metric letter), Legal premium Bond

Time from paper-load to paper-eject for continuous A, A4 printing: Four-color 4 pages per minute at 600 dpi paper: 2 pages per minute at 1200 dpi Monochrome: 16 pages per minute at 600 dpi 8 pages per minute at 1200 dpi Time from paper-load to paper-eject for continuous Legal printing: Four-color 2 pages per minute at 600 dpi paper: 1 pages per minute at 1200 dpi Monochrome: 8 pages per minute at 600 dpi 4 pages per minute at 1200 dpi Four-color transparency: 2 pages per minute Fast color, three-color (CMY): 5.3 pages per minute at 600 dpi Print times do not include image processing time, which can vary depending on image complexity.

A-size: Left and right 4 mm (0.15 in.), Top 5 mm (0.2 in.), Bottom 5 mm (0.2 in) A4-size: All sides, 5 mm (0.2 in.) Legal-size: Left and right 4 mm (0.15 in.), Top 5 mm (0.2 in.), Bottom 5 mm (0.2 in)

laser printer or copier paper Tray feed paper weight: 60 to 90 g/m

(16 to 24 lb.)

Multi-purpose tray: 89 x 254 to 216 x 356 mm (3.6 x 10 to 8.5 x 14 in.) #10 Envelope of a good quality. Tektronix transparency Tektronix Glossy Coated paper Multi-purpose tray paper weight: Cover Stock up to 163 g/m2 (60 lb) Index Stock up to 163 g/m2 (90 lb) Only A and A4 transparency ﬁlm is supported

Duplexing: 75 to 90 g/m2 (20 to 24 lb)

Paper tray capacity 250 sheets using 20-lb. paper. 100 sheets of transparency ﬁlm. The

optional Lower Tray Assembly also uses trays with the same capacity.

Service Guide

Page 29

Electrical speciﬁcations

Characteristic Speciﬁcation

Primary line voltages 90 to 132 VAC (115 VAC or 100 VAC nominal);

198 to 264 VAC (220 VAC nominal)

Primary voltage frequency range

Power consumption 130 watts (fuser off), 850 watts (fuser on) during Ready state,

Primary voltage fusing 110 VAC conﬁguration – 8 and 10 amp

Secondary DC voltages Image processor:

RF emissions Both 110 and 220 VAC-conﬁgured instruments pass these

50 to 60 Hz

950 watts during warm-up, 208 watts during printing, 45 watts during Energy Star state

220 VAC conﬁguration – 4 and 5 amp

+ 5 VDC ± 0.25 (1A minimum, 6 A maximum) Print engine: + 5V ± 0.25 (2.2 A max) + 24V ± 0.25 (3.0 A max)

standards: FCC Par t 15 Class B VDE Class B EN60555-2 Class A VCCI (CISPR 22) Class B

Environmental speciﬁcations

Characteristic Speciﬁcation

Temperature Operating Non-operating Storage

Humidity Operating Best imaging environment Non-operating

Best print quality obtained With in 15.5 Altitude

Operating Non-operating

Vibration/shock Operating

Non-Operating (vibration) Non-operating (shock)

15.5o to 32.5o C (60oto 91oF) 0o to 40o C (32o to 104o F)

-0o to 40o C (32 to 104o F) Media should be acclimated 24 hours before using in the printer .

10 to 80% relative humidity, non-condensing 20 to 65% relative humidity, non-condensing 10 to 90% relative humidity, non-condensing Media should be acclimated 24 hours before using in the printer .

to 25.5oC (60o to 78oF) and 8 to 80% RH

0 to 2500 m (8,000 ft.) at 25oC 0 to 15000 m (50,000 ft.)

May drop any side or corner 50 mm (2 in.) without impairment of subsequent operation. On ﬁve mutually perpendicular axes: 0.5 g, 25-minute sweep, 5 to 200 to 5 Hz, 100 to 200 sec./sweep cycle. No resonant frequencies below 50 Hz. 15 g, trapezoidal ﬂared pulse, 20 msec each axis.

Acoustic Noise (operating) Average sound level (LEQ) is less than 53 dbA. Peak noise in

Phaser 740 Color Printer

standby mode is 47 dbA.

Page 30

Regulatory speciﬁcations

The printer is a recognized component in conformance with the following regulatory standards:

■ The packaged product meets ASTM D4169-86 and ASTM D4728-87

Transportation Standards.

■ Listed UL 1950 Information Processing and Business Equipment.

■ Certiﬁed CSA C22.2 No. 950 Safety of Information Technology Equipment,

Including Electrical Business Equipment.

■ GS licensed IEC 950 (1991) Second Edition; EN60950 Information

Processing and Business Equipment.

■ EN50022 (CISPR 22) Class B

EN61000-3-2 EN61000-3-3 VCCI (CISPR 22) Class B

■ FCC Class B (for 115 VAC equipment) pursuant to Sub-part J of Part 15.

ICES 03 Class B

Service Guide

Page 31

Phaser 740 Color Printer

Page 32

Error Codes and Messages

Error messages

Generally, the top line of the two-line front panel display indicates the printer’s status, such as function of the three buttons located immediately below the LCD.

The front panel also displays error codes when it encounters certain system failures. These error codes are discussed in the next topic. When an error code ﬁrst occurs, cycle power on the printer to see if the error re-occurs.

Ready, Printing, Busy,

Print engine error codes

The following table list the engine failure codes that may be displayed on the printer’s front panel during normal printer operation.

Print engine service error codes

Stopped

. The bottom line indicates the

Error code Meaning of error code and what to do about it

1, 2, 3, 4

Black, Cyan, Magenta, Yellow movement error.

Push the indicated toner cartridge toward the imaging unit. Does it require more force to push that cartridge than the other toner cartridges?

Inspect the wiring harness leading from the toner cartridge selector/eject unit to CN6 of the engine control board.

Check the cam motors for proper operation toner cartridge selector/eject.

Inspect the cam motor drive gears in the toner cartridge selector/eject.

Check the cam motor ﬂags and sensors toner cartridge selector/eject.

Replace the toner cartridge selector unit.

Replace the indicated toner cartridge.

Toner cartridge/fuser fan error.

Is +24 VDC being supplied to the fan from the engine control board’s CN24 pins 1 and 2? If it is, replace the fan. If not, replace the engine driver board.

(respectively)

toner cartridge

Laser scanner motor unlocked.

Inspect the wiring harnesses leading to the laser scanner.

Replace the laser motor drive board.

Replace the laser scanner.

Replace the engine control board.

Replace the power supply.

Service Guide

Page 33

Print engine service error codes

Error code Meaning of error code and what to do about it

Laser down.

Replace the laser motor drive board.

Replace the laser scanner.

Replace the engine control board.

L-sync over time

Inspect the wiring harnesses leading from the laser driver board

to CN4. CN7, CN8 and CN 29 of the engine control board.

Replace the laser motor drive board.

Replace the laser scanner.

Replace the engine control board.

L-sync under time.

Cycle printer power and try printing again.

Replace the laser motor drive board.

Replace the laser scanner.

Replace the engine control board.t

Phaser 740 Color Printer

Page 34

Print engine service error codes

Error code Meaning of error code and what to do about it

High voltage error.

Main charge grid charger

Ensure that the imaging unit is properly installed and locked in place.

Ensure the main charge grid is properly installed. Ensure the main charge grid is clean with no foreign matter in the area. Also ensure the wire and grid plate are in good condition.

Inspect the wiring leading from the high voltage board to the main charge grid.

Replace the main charge grid if necessary.

Replace the imaging unit.

Replace the high-voltage board.

First bias transfer roller

Ensure that the imaging unit is properly installed and locked in place.

Inspect the wiring leading from the high voltage board to the imaging unit.

Replace the imaging unit.

Replace the high-voltage board.

Second bias transfer roller

Ensure that the paper feeder is properly installed and locked in place.

Ensure the transfer roller is properly installed. Ensure the bias roller makes good contact with its electrical contacts.

Inspect the wiring leading from the paper feeder to CN20 of the engine control board.

Inspect the wiring leading from the high voltage board to the second bias transfer roller.

Replace the high-voltage board.

Toner cartridge bias

Ensure that each toner cartridge makes good electrical contact with its high voltage bias terminals.

Inspect the wiring leading from the high voltage board to the toner cartridge bias terminals.

Replace the toner cartridge if a single cartridge is exhibiting trouble.

Replace the high-voltage board.

Too much conductive grease on the high-voltage contacts of a toner cartridge developer roller has migrated down and shorted to the chassis. Conductive grease should be used very sparingly.

Service Guide

Page 35

Print engine service error codes

Error code Meaning of error code and what to do about it

Photoconductive belt out of sync with accumulator belt.

Ensure that the imaging unit is properly installed and lock in place.

Inspect and clean the transparent plastic cover over the accumulator belt position sensor.

Inspect the wiring harness leading from the accumulator belt position sensor to CN13 of the engine control board.

Replace the imaging unit.

Replace the accumulator belt position sensor.

Replace the engine control board.

Positioning error of the photoconductive belt.

Ensure that the imaging unit is properly installed and locked in place.

Ensure the tension lever of the imaging unit is set in the locked position.

Inspect the wiring harnesses leading in and out of the charger sensor board.

Replace the imaging unit.

Replace the engine control board.

Accumulator belt out of position.

Is the imaging unit at the end of its life?

Is there toner on the accumulator belt cleaning blade holder? (The holder is located on the imaging unit, along the bottom of the green OPC belt.)

Check to see if any toner cartridges are leaking toner.

Ensure that the imaging unit is properly installed and locked in place.

Inspect and clean the transparent plastic cover over the accumulator belt position sensor . This sensor is located on the interior of the back wall of the chassis.

Inspect the wiring harnesses leading in and out of the charger sensor board.

Replace the imaging unit.

Replace the engine control board.

Accumulator belt cleaning blade movement error.

If the Error 32 is constant, try:

Replace the imaging unit

Replace the accumulator cleaner clutch shaft and the cleaning board

Replace the engine control board.

If the Error 32 is intermittent:

Replace the accumulator cleaner clutch shaft and the cleaning board

Replace the imaging unit.

Replace the engine control board.

Phaser 740 Color Printer

Page 36

Print engine service error codes

Error code Meaning of error code and what to do about it

Paper transfer roller movement error.

Inspect the ﬁrst drive gear (white joint gear) in the paper feeder . Are any of its teeth broke?

Ensure the second bias transfer roller is in its lower position.

Check that the transfer roller sensor ﬂag properly interrupts its sensor.

Does the transfer roller clutch and stop plate operate correctly?

Inspect the wiring harness leading from the paper feeder to CN20 of the engine control board.

Replace the paper feeder.

Replace the engine control board.

Fuser low temperature low error.

Is the fuser cold? The thermal fuse may be b lown or lamp ma y be broken. Check the fuse. Replace the fuser.

Inspect the wiring harness leading from the fuser to CN25 of the engine control board.

Replace the power supply.

Replace the engine control board.

Fuser high temperature error.

Replace the fuser.

Inspect the wiring harness leading from the fuser to CN25 of the engine control board.

Replace the engine control board.

Replace the power supply.

Fuser thermistor open.

1. Ensure the fuser is properly installed and ﬁrmly seated in place.

2. Replace the fuser.

3. Inspect the wiring harness leading from the fuser to CN25 of the

engine control board.

4. Replace the engine control board.

43 Fuser temperature rising too slow error.

1. Remove and reinstall the fuser. Insert it smoothly and solidly, with force, into place. Secure it with its thumbscrew.

2. Ensure the fuser is the correct type for the printer a 220 volt fuser installed in a 110 volt printer produces an Error 43. Replace the fuser.

3. Inspect the wiring harness leading from the fuser to CN25 of the engine control board.

4. Replace the engine control board.

5. Replace the power supply.

50 Power supply fan error.

1. Is +24 VDC being supplied to the fan from the control board

connector CN30 pins 1 and 2? If it is, replace the fan. If not, replace the power supply.

Service Guide

Page 37

Print engine service error codes

Error code Meaning of error code and what to do about it 51 Filter fan error.

1. Is +24 VDC being supplied to the fan from the engine control

board’s CN9 pins 1 and 2? If it is, replace the fan. If not, replace the engine control board.

52 Auto-duplex unit fan error.

1. Is +24 VDC being supplied to the fan from the engine control board thru the duplex unit’s interconnect connector and wiring harness during duplex printing? If it is, replace the auto-duplex unit. If not, replace the engine control board.

60 Multi-purpose tray pick-up roller motor error

1. Is the tray over-ﬁlled. Too much media will overload the motor .

2. Is the multi-purpose tray motor properly connected to the paper

feeder connector CN608. Inspect its wiring harness.

3. Inspect the wiring harness leading from the paper feed motor to connector CN20 of the engine control board.

4. Replace the paper feeder.

5. Replace the engine control board.

61 Toner cartridge (sleeve) drive motor lost sync.

1. Are the toner cartridges properly installed in position?

2. Does each toner cartridges developer roller rotate when driven

by the motor? If not replace the toner cartridge.

3. Does the toner cartridge motor rotate? Check the toner cartridge motor’s wiring harness to the engine control board at CN26. If the wiring checks out, replace the toner cartridge motor.

4. Check the toner cartridge drive gears.

5. Replace the engine driver board.

62 Paper feed motor lost sync.

1. Does the paper feed motor run and generate torque?

2. Does the gear train of the paper feeder rotate properly?

3. Inspect the fuser. Did the fuser roll wrap itself around the fuser’ s

hot roller?

4. Does the gear train of the fuser rotate properly?

5. Does the gear train of the paper eject rollers rotate properly?

6. Inspect the wiring harness leading from the paper feed motor to

connector CN20 of the engine control board.

7. Replace the paper feed motor.

8. Replace the engine control board.

Phaser 740 Color Printer

Page 38

Print engine service error codes

Error code Meaning of error code and what to do about it 63 Main motor lost sync.

1. Is the imaging unit properly installed and locked in position?

2. Do the photoconductive and accumulator belts rotate when

driven by the main motor? Manually turn the main drive gears to rotate the belts of the imaging unit. If the gear is difﬁcult to turn, replace the imaging unit.

3. Inspect the drive gear for missing teeth.

4. Does the main motor rotate? Check the main motors wiring

harness to the engine control board at CN15. If the wiring checks out, replace the main motor.

5. Replace the engine driver board.

64 LTA Error.

1. Is the printer correctly installed on top of the lower tray assembly?

2. Ensure that the Lower T ra y Assembly is the correct model for the printer. Lower Tray Assemblies for earlier model printers, such as the Phaser 560, will not work with the Phaser 740.

70 Program ROM Checksum error.

1. Replace the engine control board.

2. Replace the engine board NVRAM.

71 Program SRAM Checksum error.

1. Replace the engine control board.

2. Replace the engine board NVRAM.

72 EEPROM Checksum error (ECU).

1. Replace the engine control board.

2. Replace the engine board NVRAM.

73 EEPROM Checksum error (imaging Unit).

1. Replace the imaging unit.

2. Replace the engine control board.

3. Replace the engine board NVRAM.

74 EEPROM Checksum error (fuser).

1. Replace the fuser.

2. Replace the engine control board.

3. Replace the engine board NVRAM.

80 VSYNC time-out.

1. Check connection between the image processor board and the

engine control board.

2. Replace the engine control board.

3. Replace the image process board.

81 Power missing error. Engine control board not powered.

1. Check wiring harness CN25 to the engine control board.

Service Guide

Page 39

Print engine service error codes

Error code Meaning of error code and what to do about it 82 Serial time-out error.

1. Check the connection between the image processor board and

the engine control board.

2. Replace the image process board.

3. Replace the engine control board.

83 Command error. The image processor sent bad data to the

engine control board.

1. Reset the image processor NVRAM.

2. Check the connection between the image processor board and

the engine control board.

3. Replace the image process board.

4. Replace the engine control board.

84 Parity error.

1. Reset the image processor NVRAM.

2. Check the connection between the image processor board and

the engine control board.

3. Replace the image process board.

4. Replace the engine control board.

Phaser 740 Color Printer

Page 40

Normal power-up self-tests

This test requires no paper or customer interaction. If a problem is encountered with the image processor's expansion memory or other options, then the information is printed on the printer's startup page. Normal power-up tests take slightly longer than one minute to complete.

Any failure not allowing the printer to print the start page are displayed on the printer’s front panel with a two-digit hex code indicating what the error is. A two digit hex code with the sufﬁx “p” indicates the failure occurred during normal powerup self test.

Normal power up error codes

Code Power-up test Corrective action

10p Image Processor CPU Interrupt 1. Ensure that correct RAM 11p Instruction ROM Checksum 13p NVRAM Acknowledge

DIMMs, Code ROM SIMM, SCSI card and network card are installed

1bp PROM Data 1cp Font ROM Checksum 21p Write/Read Centronics 25p SCSI Interrupt 26p W/R SCSI Register 28p W/R LCA Registers 29p W/R CDU Register 2bp CDU Data Compression 2cp CDU Data Decompression 2ap DMA Address Test 2fp Network Card 1dp DRAM DIMM Conﬁguration 31p Base DRAM Address Paths 32p Expansion DRAM Data Paths

2. Reset the NVRAM

3. Replace the image

processor board

4. Replace the RAM DIMMs Replace the Code ROM

SIMM

5. Replace the font SIMM (if installed)

6. Replace the image processor to engine board cable

7. Replace the engine control board

36p DIMM1 Data Paths 37p DIMM1 Address Paths 3ap DIMM2 Data Paths 3bp DIMM2 Address Paths 47p Engine Control Board Status

Service Guide

Page 41

Phaser 740 Color Printer

Page 42

Troubleshooting

This topic discusses troubleshooting the printer. Troubleshooting is discussed with two approaches:

■

A step-by-step veriﬁcation procedure that systematically conﬁrms that particular components of the printer are properly functioning until a problem is found.

■

A symptom/cause scheme that lists particular printer failures and error codes and their possible causes.

System power-up sequence

The following lists the chain of events that occur when you turn on the printer. Follow this list as one means of determining if the printer is operating correctly.

When the power switch is turned on, these events occur:

■

The engine control board checks its RAM.

■

All the engine fans are turned on to ensure they work properly.

■

The fuser heater (a halogen lamp) is activated to heat up the heated roller.

■

The position of each toner cartridge is checked to ensure they are in their parked positions.

■

The print engine checks to see that the imaging unit and the paper feeder are installed.

■

The engine motors are rotated to ensure that their rotation sensors are detected.

■

A check is made to determine if any paper is jammed in the printer.

■

The print engine checks the level of toner in each toner cartridge.

■

After the fuser reaches its idle temperature the printer is placed on line in its READY state.

The print engine is initialized. If the startup page feature has not been disabled and no error occurred with the printer, the printer prints a startup page.

Service Guide

Page 43

Print engine troubleshooting

This topic is a step-by-step procedure for systematically verifying particular aspects of the printer's operation. Following this procedure should lead to the cause of a printer's failure.

Testing the print engine

If the printer does not power up, or does not initialize, or the printer initializes but the motors do not run properly, go to the later topic, “Verifying power supply operation” on page 33.

Observe that the go to the later topic “Verifying power supply operation” on page 33.

Verify that the image processor’s health LED is ﬂashing. The health LED is viewable through the grill behind the manual feed tray (when the tray is lowered).

Press and hold the test button for 4 seconds (on the rear of the printer in the center of the rear cabinet panel). The print engine responds by making a parallel line test print.

Ready

message is displayed on the front panel. If it is not,

If the printer prints a test print, then the printer's print engine is working correctly. Proceed with the next topic, “Verifying printer operation by using its self-test print” on page 33.

If the printer does not make the test print, then a problem exists with the printer. Proceed with the topic, “Verifying power supply operation” on page 33.

Phaser 740 Color Printer

Page 44

Verifying printer operation by using its self-test print

If not already on, turn on the printer. If the printer does not power up, or does not initialize, or the printer initializes but the motors do not run properly, go to the next topic “Verifying power supply operation.”

When the

Ready

message is displayed, press the

button to enter the

menu.

Press the scroll buttons to navigate to the Test Prints menu item. Select any test print.

Press

to print a test prints. The printer should print a test page from

the image processor memory.

If the printer prints a test pattern, then the print engine and image processor are working correctly and the printer's problem resides with the network or host interface. Refer to the appropriate topics in Chapter 3 “Verifying the Printer and Host Connections.”

Verifying power supply operation

Required tools

■

#1 Phillips screwdriver

■

Volt-ohm-meter (VOM)

Verifying the power supply involves four steps:

■

Measuring the input and output voltages.

■

Checking the power supply fuse(s).

■

Checking its safety interlocks.

■

Testing for a shorted motor which would shut down the power supply or damage the engine control board.

Measuring power supply voltages

Turn off the printer and unplug it from its power outlet.

AC Input:

being supplied to the printer. It should measure between 87 to 128 VAC (115 VAC nominal) or 174 to 250 VAC (220 VAC nominal).

Power supply fan

not, check the fan’s wiring harness (CN9) to the engine control board; it should measure 24 VDC. If the voltage is not correct, replace the engine control board. Otherwise, replace the power supply fan.

With the VOM set to measure AC voltages, measure for power

: With the power switch on, is the main fan running? If

Service Guide

Page 45

DC Output:

for +5 VDC and +24 VDC. If the voltage is not correct, replace the power supply. The following illustration shows the test points.

With the VOM set to measure DC voltages, measure voltages at CN301

Power supply

CN 301 Pin 9 -+24 V Pin 8 -GND Pin 7 -GND Pin 6 -GND Pin 5 -+24 V Pin 4 -+24 V Pin 3 -GND Pin 2 -+5 V Pin 1 -+5 V

3102-06

Measuring the DC voltages (test points)

If DC voltages are not being output by the power supply, proceed to the next step, “Inspecting the power supply fuses” on page 35.

If the +5 and +24 VDC voltages measure correctly, but the printer does not operate correctly, then proceed to the topic, “Safety interlocks.”

Phaser 740 Color Printer

Page 46

Inspecting the power supply fuses

The 115 VAC power supply features a 8 A and a 10 A fuse. The 220 VAC power supply fuse uses a 4 A and a 5 amp fuse.

Turn off the printer.

Remove the power supply.

Remove the power supply cover to access the fuses.

Visually, and with a VOM, check to determine that the fuse is in working order.

If the fuse is good, but the printer's power supply does not output DC voltages, proceed to the next topic, “Testing for a shorted motor.”

Safety interlocks

The printer features four safety interlock switches:

■

Front door-opened switch.

■

Right side door-opened switch.

■

Left door-opened switch.

■

Optional Lower Tray Assembly door switch.

When any of the switches are opened, the +24 VDC supply to the motors is shut down, as well as the high-voltage power supply.

Test the functionality of the interlock using the service tests described in “Service tests” on page 57.

Turn off the printer.

With a VOM, set to measure resistance, test each switch when it is opened and closed.

Inspect each switch’s wiring harness for pinches, nicks or open connections.

If you ﬁnd a switch that is defective, replace it.

If the switches work correctly and the DC voltages are correct, then the problem may be an open or otherwise faulty motor.

Service Guide

Page 47

If no motors appear to be at fault, replace the engine control board.

Right side door interlock switch

Front door interlock switch

Left door switch

Optional lower tray assembly door switch

Door safety interlock switches

3102-07

Phaser 740 Color Printer

Page 48

Testing for a shorted motor

Remove the cabinet top and rear access panel.

Refer to the topic “Wiring Diagram” on page 113 for a diagram that locates each connector.

Disconnect the motor harnesses.

Turn on the printer again to see if it overloads now that the motors are disconnected from the engine driver board.

If the motors and solenoids are functional, but the power supply still does not function, replace it.

Media jams and the paper path

Required tools

#1 Phillips screwdriver

■

VOM

Jams fall into the following four categories:

■

Media-based problems

■

Paper-picking errors

■

Printing jams

■

Paper-ejecting errors

Media-based problems

Media problems

Test the paper path using the service tests described in “Service tests” on page 57.

Check that the correct type of media is being used. The customer should be using a quality laser printer paper. The printer may have trouble picking slick-ﬁnish paper.

Inspect the paper for bent, torn or folded corners.

Ensure that the correct media is loaded in the paper tray.

Transparency ﬁlm should only be used from a transparency tray or multipurpose tray.

Refer to the media speciﬁcations in the table “Functional speciﬁcations,” on page 17.

Service Guide

Page 49

Multiple-sheet pick

Is the paper in good condition and appropriate for a laser printer? Quality ofﬁce laser printer paper works best.

Is the printer printing within its environmental speciﬁcations?

Ensure the corners or the paper are under the tabs in the corners of the tray.

Clean the pick rollers.

Replace the paper tray.

The media skews passing through the paper path

Make sure that the media is properly installed in the tray.

Does the pick-up roller pick up evenly? Is it clean?

Are the tray's side paper guides snugly adjusted against the stack of media? The guides, while not adjustable, should be neither too loose nor too tight.

Is the paper tray damaged or obstructed?

Is there an obstacle blocking the paper path?

Is the media excessively curled?

Is the customer using an appropriate type of media – a type the printer can handle?

Ensure the corners or the paper are under the tabs in the corners of the tray.

If the paper only skews when feed from the upper tray, replace the left door.

Paper tray indicates empty when it is not

The procedure for troubleshooting this problem applies to the Lower Tray Assembly as well.

Does the paper empty ﬂag properly interrupt the paper empty sensor on the paper feeder board? Open the left door to observe the ﬂag in action.

Test the sensor using the service tests described in “Service tests” on page 57.

Does the paper feeder, when installed, properly connect to the print engine? Is the paper feeder’s wiring harness properly connected to the engine control board (CN20)? (For the Lower Tray Assembly, check connector CN19). Inspect the wiring harness for defects.

Replace the paper feeder.

Replace the engine control board.

No paper feeder installed

Check to see if the paper feeder is properly installed in the printer and making good electrical contact. Push it in all the way.

Phaser 740 Color Printer

Page 50

Ensure that the wiring harness leading from the paper feeder to the engine control board is properly installed in connector CN20. Check the wiring harness for defects.

Replace the engine control board.

No imaging unit installed

Ensure that the imaging unit is properly installed and locked in place.

Check the main charge grid boss on the rear of the charger to ensure it is not broken. When the imaging unit is installed, the boss pushes a ﬂag on the charger sensor board. Replace the charger or imaging unit if it is broken.

Test the sensor using the service tests described in “Service tests” on page 57.

Check the high-voltage terminal connectors for the imaging unit to ensure that they are not damaged.

Jams

Paper mis-picks at the paper tray

Is the paper in good condition and appropriate for a laser printer?

Is the printer printing within its environmental speciﬁcations?

Is the pick-up roller dirty? If so, clean it and try printing again. You can also slide off the “treads” from the pick rollers and reverse them to present a fresh pick-up roller edge to the paper.

Does the pick roller rotate? Mark the end of the pick roller shaft. Open the front door and defeat the door open interlock to see the shaft turn.

■ If the roller does not rotate, does the paper feed motor run? Check the

motor’s wiring harness and connection (CN20) to the engine control board.

■ Check the gear train for broken teeth and proper installation.

■ Replace the paper feed motor.

■ Replace the engine driver board.

■ If the pick roller rotates out of position with each pick, its clutch is worn.

Replace the paper feeder.

Service Guide

Page 51

If the pick roller does rotate, is the pick roller correctly installed (ﬂat side of the cam-shaped pick rollers face down prior to picking a sheet of paper)?

■ Does the pick solenoid work properly? It must energize for the pick roller to

be engaged and rotate. If it doesn’t, replace the paper feed circuit board.

■ Replace the paper feeder.

Paper jams midway in the paper feeder

Ensure that the pick-up rollers are clean.

Check the left side door for burrs or foreign obstructions that could block the movement of a sheet of paper.

Clean the intermediate rollers (pinch roller and drive roller).

Check the pinch intermediate roller mounted on the inside of the left door for even spring tension at each end of the roller. The spring tension should measure about 65 grams when the roller end is in the middle of its travel in its slot.

Does the pick-up roller clutch work properly?

Try printing using a different paper tray.

Transparency ﬁlm. Do not use transparency ﬁlm in the lower tray of the Lower Tray Assembly.

Paper jams at the second bias transfer roller

Clean the intermediate rollers.

Is the transfer roller correctly installed?

Is the transfer roller moving up for image transfer when it should?

Does the paper jam sensor ﬂag properly interrupt the sensor? Check the wiring harness of the paper jam sensor leading to CN607 of the paper feeder board.

Does the drive intermediate roller rotate? If not, check the gear train driving the gears for proper installation and for broken teeth.

Check the left side door for burrs or foreign obstructions that could block the movement of a sheet of paper.

Clean the aligning rollers.

Do the aligning rollers rotate during a paper pick? Determine if the aligning roller clutch operates correctly.

10.

Check that the paper feeder wiring is properly installed and that the wiring harnesses are not damaged.

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Page 52

11.

Check the spring pressure at each end of the aligning rollers. Lifting each end of the roller with a tension gauge should reveal a measurement of about 1 kg (2.2 lbs).

12.

Check the left side door for burrs or foreign obstructions that could block the movement of a sheet of paper. Check for a paper scrap in the paper guide.

13.

Try printing using a different paper tray.

Fuser jams

Is the paper in good condition and appropriate for a laser printer?

Is the printer printing within its environmental speciﬁcations?

Is this a duplex print with heavy printing (lots of toner coverage) on the ﬁrst-printed side? Print the light-printing side ﬁrst.

Is the heat shield plate at the entrance of the fuser loose and obstructing the paper path?

Inspect the fuser’s gear train leading to the paper feed motor. Does it rotate properly? Do any of the gears show broken teeth?

Does the fuser exit sensor ﬂag properly actuate its sensor?

Inspect the wiring harnesses leading from the cartridge sensor/eject unit to CN21 of the engine control board.

Inspect the fuser roll. If it is empty, replace the fuser roll.

Observe if the exit rollers rotate during the print process. If they do not, reinstall the fuser to ensure its gear train (which also drives the exit roller) properly connects to the paper feed motor.

10.

Replace the fuser.

11.

Replace the engine control board.

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Page 53

Eject jams

Is the paper in good condition and appropriate for a laser printer? Is the paper curling?

Is the printer printing within its environmental speciﬁcations?

Is the jam caused by a heavy, stiff paper being printed in face-down mode? In such cases, face-up mode or a lighter grade of paper should be used.

Is the paper excessively curved after passing through the fuser that the reverser (eject unit) can’t ﬂip the paper? Try ﬂipping the paper over in the tray.

Clean all the eject rollers.

Inspect the interior of the printer reverser of the toner cartridge selector/ paper eject unit. Ensure that the metal ﬁngers inside the reverser are not bent or interfere with paper movement.

Does the paper exit sensor ﬂag properly actuate its sensor?

Inspect the wiring harness leading from the cartridge sensor/eject unit to CN308 of the engine driver board.

Replace the cartridge selector/eject unit.

10.

Replace the engine control board.

Multi-purpose tray feed jams

Is the paper in good condition and appropriate for a laser printer?

Is the printer printing within its environmental speciﬁcations?

Do not overload the multi-purpose tray; otherwise jams will occur. Check the position of the media thickness selector at the paper feeder (inside the left door).

Clean or replace the multi-purpose feed pick roller.

Is the picked media properly interrupting the aligning sensor?

Is the multi-purpose feed sensor empty ﬂag properly interrupting the multipurpose pick sensor?

Check the wiring harness between the multi-purpose sensor circuit board and the paper feeder board (connector CN607). Ensure that the wiring harness is not damaged.

Check the wiring harness leading from the paper feeder to the engine control board (connector CN20).

Replace the paper feeder circuit board.

10.

Replace the engine control board.

Jams in the auto-duplex unit

Is the auto-duplex unit correctly installed?

Phaser 740 Color Printer

Page 54

Clean the rollers inside the auto-duplex unit.

Inspect the duplex unit for foreign objects such as a shard of paper.

Does the auto-duplex unit’s clutch operate correctly? Refer to “Service tests” on page 57.

Inspect the auto-duplex unit’s electrical connector for damage.

Replace the auto-duplex unit.

Other problems

These problems may be indicated as errors on the front panel.

The printer continuously displays “Initializing”

The most likely cause is that the image processor has not loaded its EEPROM contents (instructions) into RAM successfully. This is usually indicated by the health indicator LED (heart beat) being on or off but not ﬂashing. All print engine operation halts, and will only become ready when the image processor has successfully booted.

Re-powering the printer, or perform a NVRAM reset.

To verify if the image processor has failed:

Power down the printer, and remove the back of the printer to gain access to the ribbon cable connecting the image processor board to the print engine control board; disconnect the ribbon cable at the control board.

Power-up the printer. Wait at least 5 minutes while the print engine initializes. If there was a problem with the image processor, it will now not affect the print engine control board.

Check if the print engine is OK by pressing the print engine test print button, you should get the parallel line test print. If not, then your problem is most likely associated with the print engine control board, and you will need to replace it. If, however, you get the print engine test print, then your most likely cause is the image processor.

No toner cartridge installed message when it is

Ensure that the toner cartridge is correctly installed.

Replace the toner cartridge.

Replace the toner cartridge drive unit.

Replace the engine control board.

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Page 55

No fuser installed message when it is

Ensure that the fuser is correctly installed.

Check the fuser’s connection and wiring.

Check the wiring harness leading to the fuser power connector.

Replace the fuser.

Replace the engine control board.

No fuser roll installed message when it is

Ensure that the fuser roll is correctly installed.

Check the fuser’s connection and wiring.

Check the wiring harness leading to the fuser power connector.

Replace the fuser.

Replace the engine control board.

Front door open when it is closed

Inspect that the front door’s interlock for damage.

Inspect the cartridge selector/eject unit interlock mechanism for damage.

Inspect the front door cartridge selector/eject unit interlock mechanism. Ensure that when the interlock is actuated by the cartridge selector/eject unit being closed, the interlock switch, mounted on the toner cartridge drive unit, closes (with an audible click).

Replace the interlock switch.

Replace the power supply.

Replace the engine control board.

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Page 56

Left-side door open message when it is not

The procedure for troubleshooting this problem applies to the Lower Tray Assembly as well.

Is the left door open switch, located in the lower-left back corner of the printer, properly in place?

Does closing the left door actuate the left door open switch?

Is the left door properly in place? Replace the door if it does not operate correctly.

Is the left door open switch’s wiring harnesses properly connected to the engine control board (CN3 – 24V interrupt)? In the case of the Lower Tray Assembly, is the printer properly seated onto the Lower Tray Assembly with good electrical connection. Try reseating the printer. Check the lower feeder’s wiring harness to the engine control board at connector CN19.

Replace the left door open switch.

Replace the engine control board.

High temperature error

Replace the power supply unit.

Check the fans.

Replace the engine control board.

Low temperature error

Ensure the fuser is properly installed.

Check the fuser’s connection and wiring.

Check to see if the fuser’s thermo-fuse is open. With an ohmmeter, measure the top two pins of the fuser’s connector. For 110 VAC fuser you should measure 1.6 ohms. For 220 VAC fuser you should measure 5.4 ohms. If it is opened, replace the fuser.

Replace the fuser.

Replace the power supply unit.

Replace the engine control board.

Service Guide

Page 57

High voltage error

Replace the high voltage board.

Inspect the high-voltage wiring.

Replace the imaging unit and check the printer for proper operation.

Sequentially replace each toner cartridge and check the printer for proper operation.

Ensure that excessive conductive grease has not migrated and shorted a high-voltage contact to ground on the second bias transfer roller.

Thermistor open error

Check the connector CN27 on the engine control board.

Ensure a 110 volt fuser has not been installed in a 220 volt printer; it will damage the power supply thermistor and require the power supply be replaced.

Replace the fuser.

Replace the engine control board.

Front panel cycling between READY and WARMING UP

Make sure that the fuser, imaging unit, and toner cartridges are well seated.

Invoke a test print from the Front Panel to try to get an error message to be displayed that may be present but, is masked by the front panel cycling between READY and WARMING UP.

Make sure all connectors to the circuit boards are well seated and make sure that the screws holding the boards’s in place are tight.

Erratic printer behavior

Check the amount of RAM installed in the printer. While more than 192 Mbytes of RAM can be physically installed on the image processor board, it can electrically support no more than 192 Mbytes. Unreliable printer operation can otherwise result.

Installed RAM not recognized

Upon power-up, the image processor checks each DIMM for information such as data width, clock delay, number of address columns and row, refresh rate and more. If the DIMM does not meets the required speciﬁcations it will be ignored; no error message will be reported.

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Page 58

Printing and print quality problems

Required tools

■ #1 Phillips screwdriver ■ Conductive grease

■ Volt-ohm

meter (VOM) ■ Ruler

Note

Refer to the later topic, “Test Prints” on page 103 for many examples of print defects.

Blank print

Press, and hold for 4 seconds, the rear panel Test Print button to determine if the print engine will image at all. It should produce a parallel line print. If the engine produces a good parallel line print, the print engine is good and the image processor board is bad. If you get a blank print then the following items may be defective. The engine test print feature only works if a paper tray is installed in the top tray slot.

Replace the laser unit.

Replace the imaging unit.

Determine if the cartridge selector is pushing the toner cartridges into contact with the photoconductive drum.

Replace the toner cartridge drive unit.

Replace the cartridge sector/eject unit.

Replace the engine driver board.

All-black print

Entire print, including margins is black. Remove and reinstall the main charge grid.

Inspect the main charge grid for a broken corona wire. Replace the main charge grid.

Replace the high-voltage board

Margins are white, print is black. Replace the image processor board.

Replace the engine control board.

Service Guide

Page 59

Missing primary color

Replace the toner cartridge of the missing color.

Determine if the cartridge selector is pushing the toner cartridges into contact with the photoconductive drum.

Check the wiring harness leading from the cartridge selector/eject unit to CN308 of the engine control board.

Replace the toner cartridge drive unit.

Replace the engine driver board.

Light print

Is the paper in good condition and appropriate for a laser printer?

Check the media type and tray type for proper match. Does the media in the multi-purpose feeder match the default setting made using the front panel?

Is the printer printing within its environmental speciﬁcations?

Inspect the high voltage connector for poor contact with the second bias transfer roller.

Inspect the path the laser beam travels for contamination.

Inspect the action of the cartridge selector to ensure that it is pushing the toner cartridges into full contact with the photoconductive drum.

Replace the imaging unit.

Replace the second bias transfer roller.

Replace the engine control board.

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Page 60

Repeated spots or lines on print in-line with each other

Measure the spacing between the spots. The distance between the repeating spots indicates the source of the problem.

■ Thin horizontal lines, depending on problem, the distance between lines may

range from 1.5 mm (1/20th inch) between each line to 103 mm (4 in.) between each line. The gear are “chattering” in paper feeder. Apply a single drop of molybdenum grease (brown grease) to each gear and let print action work the grease into the gears. Avoid excess grease.

■ 26.5 mm (1 in.): Toner cartridge at 1200 dpi. Replace the toner cartridge.

■ 35 mm (1.3 in.): Toner cartridge at 600 dpi. Replace the toner cartridge.

■ 76 mm (3 in.): Second bias transfer roller. Replace the transfer roller.

■ 43 mm (1.7 in.): Imaging unit drive gear train.

■ 95 mm (4 in.): Imaging unit belt roller defect. Replace the imaging unit.

■ 102 mm (4.1 in): Paper feeder drive gear broken tooth. Replace the paper

feeder drive gear.

■ 121 mm (5 in): Fuser roller defect. Replace the fuser.

Dark vertical line in print

Inspect the scorotron charger for toner or other contamination. If contaminated, its charge wire will appear fuzzy.

Replace the toner cartridge if the dark stripe is of one primary color.

Inspect the photoconductive belt for damage. Replace the imaging unit if necessary.

Replace the fuser.

White horizontal line or band in all the colors of a print

Replace the imaging unit.

Replace the second bias transfer roller. Inspect it for loose roller contacts. Grease the end of the roller shaft with conductive grease.

Service Guide

Page 61

Vertical lines in the print

Inspect the path the laser beam travels for foreign matter that could block the beam from striking the photoconductive belt.

Check the main charger wire and grid. White streaks are caused by a dirty grid. Black streaks are caused by a dirty wire.

If the line is colored, one toner cartridge may not be outputting toner correctly. Replace the missing color’s toner cartridge.

Inspect the second bias transfer roller for a scratch or contamination. Replace the roller if necessary.

Inspect the cleaning blade. Ensure no foreign matter is stuck to it.

Are the fuser rollers scratched? Replace the fuser.

Dirty background

Inspect the scorotron charger for toner or other contamination.

If excess printing in background is of one primary color, replace that color’s toner cartridge.

Replace the high-voltage board.

Mis-transfer, missing portions of toner

Inspect the heat roller (top roller) of the fuser for scratches or contamination.

Replace the fuser.

Dark, irregular steaks in all colors

Waste toner box full; replace the imaging unit.

Replace fuser.

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Page 62

Ghosting

Ghosting with some images is unavoidable because of the color structure of the images. If a color is used at one part of the image area and the same color is used again at a later area, it is very possible to get ghosting of the ﬁrst image into the second image area after one revolution of the toner cartridge developer roller. This occurs because the charge that is created from the ﬁrst use of the color was not totally extinguished. A small residual charge remains associated with the color, resulting in a second use of the color to be darker in the same areas as the ﬁrst image. This results in the ﬁrst image ghosting into the second image when the same color is used.

A new toner cartridge exhibits less ghosting. Ghosting increase as toner cartridges age.

Unfused or partially fused printing

Is the paper in good condition and appropriate for a laser printer?

Is the printer printing within its environmental speciﬁcations?

Replace the fuser unit.

Image is skewed on the paper

Is the paper in good condition and appropriate for a laser printer?

Is the printer printing within its environmental speciﬁcations?

Swap the tray that the affected print originates from.

Ensure that the paper feeder is properly installed. Inspect its paper pick roller. Look for obstructions in the paper path.

Clean the intermediate and aligning rollers.

Replace the paper feeder.

Stains on the back of the print

Do not touch the surface of a second bias transfer roller.

Empty the waste bin of the second bias transfer roller.

Clean the paper path of the paper feeder.

Inspect the fuser rollers for contamination. Replace the fuser.

Replace the paper feeder.

Service Guide

Page 63

No printing on edge of print

If one primary color is missing, replace that color’s toner cartridge.

Check that each toner cartridge moves forward smoothly toward the imaging unit. Also inspect the two metal pads on the ends of the toner cartridge that the toner cartridge selector cams push against.

Inspect the cartridge selector/eject unit to ensure that the cams are in good condition. Replace the cartridge selector/eject unit.

Replace the imaging unit.

Image is not centered on the print when it should be

Is the paper in good condition and appropriate for a laser printer.

Is the printer printing within its environmental speciﬁcations?

Ensure the paper feeder is properly installed.

Is the top and left margin adjustments correct? Refer to the service tests discussed in the topic “Printer self-diagnostics” on page 57.

Clean the intermediate and aligning rollers.

Replace the paper feeder.

Replace the engine control board.

Replace the laser scanner.

The print is wrinkled

Check for an obstruction in the paper path, particularly the paper feeder and the fuser.

Is the paper in good condition and appropriate size, weight, grain and grade for a laser printer?

Is the printer printing within its environmental speciﬁcations?

If possible, you should feed long-grain paper into the printer. Long-grained paper's grain is parallel to the paper path (the direction the paper travels while it is fed through the printer).

If the print is exiting the printer with “dog-ears” (the corners folded down, check the paper separators metal tabs in the corners of paper tray. Bend the tabs slightly to correct the problem or replace the tray.

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Page 64

Macintosh printing problems

Image never prints

The printer indicates it is receiving data, but nothing comes out of printer or goes back to Ready mode without printing an image.

Make sure that the correct Phaser 740 icon was selected in the Chooser. Try printing the job again. Try printing a different ﬁle or from a difference application.

In the Chooser, switch background printing off. Try printing the job again. With newer LaserWriter printer drivers, select foreground printing in the print dialog box.

Download the Echo showpage snippet which produces a blank sheet of paper, to determine if the printer is receiving and processing ﬁles.

Make sure you are printing with the correct PPD ﬁle.

Activate Error Handler using the front panel Printer Defaults menu. Alternately, download the Error Handler utility and try printing the job again. If an error page is printed after printing the job again, call the Customer Support Hotline at 1-800-835-6100 for further assistance. Please have the error page in hand.

If available, try printing to a black-and-white PostScript Level 2 printer (such as an Apple LaserWriter). If the ﬁle does not print on the black-andwhite PostScript printer, this may mean that the problem may be application- or network-related.

Ensure that the print engine can print by pressing the rear panel TEST PRINT switch to print an internal test print. A paper tray must be installed

in the top tray slot.

Image prints in black-and-white

In the Chooser, ensure a color printer icon is displayed next to the Phaser 740 in the list of available printers. This indicates the printer’s PPD has been selected and conﬁgured.

In the print dialog box, make sure that the Color/Grayscale option has been selected.

Make sure that the Phaser 740 icon was selected in the Chooser. Try printing the job again.

Check the version of your LaserWriter driver to ensure that it is version 6.0.x or higher. Earlier versions of the driver do not support color PostScript.

The application may require special instructions to print, such as those contained in a.PPD ﬁle. Check in the Phaser 740 CD-ROM.

Image is rotated 90 degrees

In the application's Page Setup, make sure that the image is selected to print in portrait or landscape orientation as you expect.

Service Guide

Page 65

Make sure that the tray width sensor is working correctly.

Printer isn’t in the Chooser

Ensure that the printer is turned on and the rear panel health light is ﬂashing at a regular rate.

Check the Network or AppleTalk control panel to ensure the proper network or zone is selected.

Check to see if the printer has not been renamed or placed in another zone. You can print out a conﬁguration page which lists this EtherTalk information as well as other information about the printer.

Windows printing problems

Image never prints

The printer’s Receiving data message is displayed as if receiving data, but nothing comes out of printer or the printer goes back to Ready mode without printing an image.

Under the printer's set up options, set RETRY = 850.

Phaser 740 Color Printer

Page 66

Service Tests and Adjustments

This topic discusses using the front panel’s interactive mode to review and change the printer’s operation. It also contains the procedures to test and calibrate the printer after you replace key Field Replaceable Units and to evaluate the printer's functionality.

Required tools

■

Magnifying lens (preferably illuminating)

■

Phillips screwdriver

Service Guide

Page 67

Printing test prints

The prints printed via the front panel are generated by the image processor. While the printer is idle you can use the front panel to print an image stored in the image processor such as the Conﬁguration Page.

Print service test prints

The service prints allow you to evaluate the printer’s print quality. Service Print 1 is four pages of 25% tint primary color ﬁlls and one page of all for colors at 25% ﬁll. Service Print 2 prints a 600 and 1200 dpi test pattern as well as a solid-ﬁll red print.

Press the

With the

Service Print 2

Printing the Conﬁguration Page

The conﬁguration page shows a great deal of information regarding the data and setup values stored in NVRAM. In the same Help pages menu you can also print the startup page.

button.

Help pages

menu item. Press

menu displayed, scroll to the

Service Print 1

Press the

With the menu item. Press

button.

Help pages

menu displayed, scroll to the

Configuration Page

Printing the demonstration pages

Demo pages demonstrate the capabilities of the printer.

Press the

With the item. Press

button.

Help pages

menu displayed, scroll to the

Demonstration Page

Printing the print engine’s test print

The print engine can print a test print independent of the image processor. The print is a composite gray ﬁll composed of cyan, magenta and yellow toner. No black toner is used in the print.

Press and hold for 4 seconds the Test Print button in the center of the upper rear cover.

This veriﬁes the print engine’s ability to print independent of the image processor. Do not use this print to verify print quality. Since the print engine defaults to the top tray as a paper source, the Test Print function will not work with the auto-duplex unit installed.

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Page 68

Printer self-diagnostics

The printer’s image processor features four types of self-test modes. The type of selftests run depend upon which front panel buttons are pressed while the printer is turned on. The button combinations are listed here.

■

Turning on the printer or restarting the printer remotely executes normal image processor power-up self-tests and then, if the tests pass, proceed to launch its PostScript interpreter.

■

Pressing and holding Button 3, as you turn on the printer, executes interactive service test with the image processor board and the print engine.

■

Pressing and holding Button 1 and 4, as you turn on the printer, allows you to reset the NVRAM to its factory-default values. Refer to the later topic, “Resetting NVRAM” on page 67. This also reset the NVRAM of an installed network card.

Service tests

Service tests provide the means to test and check the printer’s electro-mechanical components and sensors, test the paper path, calibrate the margins, test RAM and check for engine errors.

Start service tests by pressing and holding Button 3 (third button from left) while turning on the printer. When the message “ front panel, release button 3. Using the

Start

test. Press the

button to execute the test. Some of the test have sub-menus you

Service Diagnostics

and

button, scroll to the desired

” appears on the

must navigate in a similar fashion. Use the Exit button to stop a test as well as return to the main menu. To exit Service test mode turn the printer off and on.

Print engine service test descriptions

Category Test Subtest

Image processor Kernel CPU Interrupt

Bridge BootROM checksum NVRAM Ack

Memory IROM Checksum

DIMM 1 Data DIMM 1 Address DIMM 2 Data DIMM Address RTC Font ROM Checksum NVRAM Read/Write Ethernet Read/Write

I/O SCSI Interrupt

SCSI Reg Read/Write Centronics Interrupt Centronics Read/Write Ethernet Read/Write

Service Guide

Page 69

Engine Set Margins Top Margin

Front Margin Back Left Margin

Paper Path Top Tray

Middle Tray Multi-purpose T ra y Bottom Tray

Sensors Fr./Rt. Door Top Tray Paper

Left Access Door Top Tray Sw1 Lower Feeder Door Top Tray Sw 2 Fuser Installed Top Tray Sw3 Fuser Roll Installed Middle Tray Paper Fuser Roll (New/used) Middle Tray Sw1‘ Imaging Unit Installed Middle Tray Sw2 Accumulator Belt T ension Middle T ra y Sw3 Charger Unit Installed Bottom Tray Paper IUT Position Bottom Tray Sw1 Multi-purpose T ra y‘ Bottom Tray Sw2

Media Multi-purpose T ra y Pick Bottom Tray Sw3

Position Registration Roller Black Cart Installed Fuser Exit Cyan Cart Installed Paper Exit Magenta Installed Output Tray Yellow Installed Auto-duplex Jam Auto-duplex Gate

Motor Tests Main Motor

Paper Feed Motor Cartridge Motor Laser Motor Lower Feeder Motor Filter Fan Power Supply Fan Fuser Fan Auto-duplex Unit Fan Multi-purpose T ra y Motor Black Cam Motor/sensor Yellow Cam Motor/sensor Magenta Cam Motor/sensor Cyan Cam Motor/sensor Black Cam Motor/sensor

Clutches Black Cartridge Clutch

Yellow Cartridge Clutch Magenta Cartridge Clutch Cyan Cartridge Clutch Registration Clutch Auto-duplex Unit Clutch

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Page 70

Engine (cont.) Solenoids Transfer Roller Solenoid

Cleaning Blade Solenoid Face Up/down Solenoid Top Pick Solenoid Middle Pick Solenoid Bottom Pick Solenoid Fuser Roll Solenoid Auto Duplex Unit Bypass Solenoid

Command Engine Main Motor On/off Yellow Roller On/off

Paper Feed Motor On/off Cyan Roller On/off Cartridge Motor On/off Magent Roller On/off Laser Motor On/off Registration Clutch Lower Feeder Motor On/off Paper To Auto

Duplex Multi-pur Tray Motor On/off Auto-dup Pick Clutch High Voltage Supply On/off Top Pick Roller Erase Lamp On/off Middle Pick Roller All Fans On/off Bottom Pick Roller Paper To Exit Transfer Roller Black Cam On/Off Cleaning Blade Yellow Cam On/Off Face Up/Dn Sole. Cyan Cam On/Off Fuser Roll Advan Sol Magenta Cam On/Off Blow New Fuser Roll Black Roller On/Off Main Motor On

Misc. Tests Er ase Lamp

HHS Laser Scanner Seal Energy Star

Maintenance Clean Accumulator Belt

Clean Top Pick Rollers Clean Middle Pick Rollers Clean Bottom Pick Rollers Clean Multi-purpose Tray Pick Rollers

Engine Status Status 1 Thru 49 Hex Codes

- Engineering Use Only-

General Status Status: <Reports Engine Status>

Top Tray: <T ra y Type> Middle Tray: <T r ay Type> Bottom Tray: <T r ay Type> Engine Control Board ROM Version: <Version> Fuser Temperature: <Temp Celsius> Ambient Humidity: <Range Of Relative Humidity> Ambient Temperature: <Temp Celsius>

Help Turn Help On/off For Each Image Processor And

Engine Menu

Service Guide

Page 71

Print engine calibration

Generally, no print engine calibration is required. Usually, if you note a print defect, replacing a toner cartridge, the imaging unit or the transfer roller (or perhaps the paper feeder) corrects the problem.

Printer color correction

Correcting printer colors is accomplished manually. You use front panel menus to make the corrections.

Manually setting color corrections

Press the menu.

Press the right arrow to scroll to the

Press selections for each primary color. The currently selected colors are oriented through the midline of the page with the alternate choices extended above and below them.

to enter the Adjust each color menu.

button on the front panel to scroll the Calibrate Colors

Adjust each color

to print a reference print showing the printer’s current

menu item. Press

Phaser 740 Color Printer

Page 72

Color Reference Page

Cyan Magenta Yellow Black

+10

-4

-2

-9

-7

-5

-3

-1

+10

-6

-4

-2

-9

-7

-5

-3

-1

9698-18

Manual color correction reference print

Overlay and compare the pre-printed primary Color Density Samples in the

Phaser 740 Color Printer User Guide

to the selected colors on the midline of the print. If any primary color does not match, overlay and compare to an alternate color. Note the number, -10 to +10, referenced to the alternate choice.

Press the right arrow on the front panel to scroll to the

Adjust <

color

menu for the primary color you wish to change.

Press the arrow keys to increment the displayed value (from -10 to +10) to match the alternate color selected from the reference print. Then press

An “

Repeat Step 4 through 6 for any other color that needs adjustment.

Press

” indicates the selected value.

Exit

to leave the Color Calibration menus.

>:+0

Service Guide

Page 73

Phaser 740 Color Printer

Page 74

Cleaning and Maintenance

Service preventive maintenance procedure

Whenever you check, service, or repair a printer, you should perform the following procedures. Cleaning the printer, as outlined in the following steps, assures proper operation of the printer and reduces the probability of having to service the printer in the future.

The frequency of use and the type of paper a customer prints on determines how critical cleaning the machine is. Users of ordinary Bond paper (copier paper) should have very few problems since this paper is smooth and relatively dust-free. You should thoroughly inspect and clean these printers.

Ask each printer customer about the type of paper he or she uses so that you can be sure to clean the parts of the printer that particular paper may affect. If a customer is printing on the more unusual or dustier papers, then you should pay particular attention to these printer parts:

■

The standard pick roller

■

The multi-purpose pick roller (should be replaced at 30 k prints)

■

The multi-purpose tray cork separator (should be replaced when multipurpose pick roller is replaced)

■

The feed rollers

■

The auto-duplex unit rollers

■

The cabinet interior

■

The exit rollers

Service Guide

Page 75

Recommended tools

■

Toner vacuum cleaner

■

Suction bulb (air blower)

■

Cleaning water

■

Lint-free wipes

■

Cotton swabs

■

Imaging unit cover

■

Isopropyl alcohol (greater than 90% pure)

Cleaning

Turn off the printer.

Remove the imaging unit and immediately cover it to protect it from the light.

Remove the toner cartridges.

Remove the fuser.

Remove the paper tray.

Slide out the paper feeder.

Clean the accumulator belt home position sensor with a dry cotton swab.

Clean all printer rollers, except the second bias transfer roller, with alcoholdampened wipes only. Never apply alcohol on the second bias transfer roller.

Clean the laser window with puffs of air from the suction bulb. Alternately, you can vacuum the window clean.

10.

Wipe off the pre-exposure lamp bezel and the pre-transfer lamp bezel with a lint-free wipe.

11.

Vacuum out the interior of the printer.

Phaser 740 Color Printer

Page 76

12.

Carefully clean the area around the second bias transfer roller’s cleaning roller for impacted toner.

Remove the second bias transfer roller

Tap on the cleaning roll cover to knock the toner loose from that area.

Vacuum the toner.

Lubrication

■

Molybdenum-based (brown) grease, part number 006-7436-00. For all metal-to-metal, metal-to-plastic, and plastic-to-plastic gears.

■

High-temperature, electrically-conductive grease, part number 006-7056-00. For the plastic gears of the fuser and the end of the transfer roller shaft.

Service Guide

Page 77

Phaser 740 Color Printer

Page 78

Resetting NVRAM

Resetting NVRAM returns all the image processor's NVRAM-stored parameters to their factory defaults except the print counts and the Adobe ﬁrmware serial number.

To reset the image processor to its factory default values, follow this procedure:

Turn the printer off.

Press and hold the front panel Buttons 1 (Exit) and 4.

Turn the printer on.

When the front panel displays the message 1 and 4.

At this point the message press Buttons 1 (Exit) and 3 at the same time. The NVRAM parameters will be reset to their factory default values. If you do not press buttons 1 and 3 in the allotted time, the NVRAM will not be changed.

password?

will be displayed. Within 10 seconds,

NVRAM Default

, release Buttons

Service Guide

Page 79

Phaser 740 Color Printer

Page 80

Key FRU Disassembly

This topic illustrates how to remove and replace key printer Field Replaceable Units (FRUs). Refer to the later topic “FRU List” on page 87 for a list of the printer’s FRUs. For more detailed removal/replacement procedures refer to the

ROM

Printer cabinet

Top cover

Hinge frame

Conical spring

Phaser 740 Service CD-

Upper rear cover

Lower rear cover

Removing cabinet covers

Left door

Hinge pin

Door

Retainer hooks

Left side cover

Multi-purpose tray

740-7-1

Service Guide

Page 81

Toner level sensor board

Front door

Upper front cover

Front

Bottom front cover (lift printer to remove)

Right side covers

Rear

Lower (lift printer to remove)

740-7-2

Removing cabinet covers

Phaser 740 Color Printer

Page 82

EMI shields

EMI shield

Interconnect wiring shield

Removing the EMI shields

Note

Unplug the engine-to-image processor cable from the engine control board.

740-7-3

Service Guide

Page 83

Cartridge selector/eject unit (right door)

Disconnect the cartridge selector/eject unit’s wiring harness.

Counting from the rear of the shaft, remove the third E-ring from the cartridge selector/eject unit’s shaft.

Remove the E-ring and keyed bushings from each end of the cartridge selector/eject unit’s shaft.

Remove the E-ring second from the front of the cartridge selector/eject unit’s shaft.

Caution

Unlatch the cartridge selector/eject unit and lower it half-way down to relieve spring pressure to enable moving the cartridge selector/eject unit’s shaft. Slide the shaft forward until it clears the frame. If necessary, tap the rear end of the shaft with a screwdriver handle (no metal) to move it forward.

Unhook the tension springs at each end of the shaft from the engine frame. Note how they fasten to the frame and the right door.

Beginning at the rear, remove the cartridge selector/eject unit.

In the next step, do not bend the frame to give additional clearance, as a damaged frame is not replaceable.

Phaser 740 Color Printer

Page 84

Cartridge selector/ eject unit (right door)

Remove E-ring and bushing

E-ring Keyed bushing

Frame Spring Keyed

Washer Washer

Remove E-ring

Remove E-ring and bushing

Removing the cartridge selector/eject unit

Disconnect wiring harness

Washer Keyed Washer Spring Frame

Keyed bushing

E-ring

740-7-7

Service Guide

Page 85

Paper feeder and tray sensor board

Paper tray sensor board

Paper feeder

Back-out stop screws

Removing the paper feeder

740-7-4

Phaser 740 Color Printer

Page 86

Multi-purpose tray pick roller

The multi-purpose pick roller should be replaced whenever the cork separator pad is replaced. The expected life of each is about 30k prints.

With a small, narrow, ﬂat-blade screwdriver, carefully release the snap-ﬁt cover over the multi-purpose tray pick roller. Small access holes allow you to access the ﬁve retaining latches.

Remove the C-clip retainer from the pick roller shaft.

Slide the right-end pick roller retainer on its shaft about 75 mm (3 in.) towards the front of the printer. You may need to use a small ﬂat-blade screw driver to release the retainers hook from the groove in the shaft it locks into.

Slide the pick roller 50 mm (2 in.) on its shaft towards the front of the printer. Lift up and remove the pick roller.

Latch

Pick roller cover

Latch

Pick roller retainer

Retainer

groove

Removing the multi-purpose tray pick roller

Multi-Purpose tray pick roller

740-7-5

Service Guide

Page 87

Cork separator pad

The cork separator pad should be replaced whenever the multi-purpose pick roller is replaced. The life is about 30k prints.

Grasp the paper guide and push in and down to the bottom of it travel, then tilt it forward.

With a small, narrow, ﬂat-blade screwdriver, reach behind the cork separator pad and free the two retaining hooks hold the separator pad in place. Note the spring is under tension. Remove the separator pad and spring.

Install a new cork separator pad.

Paper guide

Retaining

hooks

Spring

Cork separator pad

Paper guide

Removing the cork separator pad

Phaser 740 Color Printer

740-7-6

Page 88

Laser scanner

Laser motor driver board

Disconnect wiring harnesses

Separate these two wiring harnesses to minimize possible crosstalk

Shield

Remove three screws

Laser scanner

Removing the laser scanner and driver board

740-7-8

Service Guide

Page 89

Power supply

Disconnect wiring harnesses

Removing the power supply

740-7-9

Phaser 740 Color Printer

Page 90

Main motor

Paper feed motor

Toner cartridge drive motor

Cleaning board

Toner cartridge drive motor

Paper feed motor

Main motor

Removing the main motor, paper-feed motor, toner cartridge drive motor and cleaning board

Service Guide

Page 91

Toner cartridge drive unit

Accumulator belt home position sensor

Left door open interlock switch

Toner cartridge drive unit

Home position sensor

Removing the toner cartridge drive unit, home position sensor and the left door interlock switch

Left door-opened interlock switch

Interlock switch cover

740-7-13

Phaser 740 Color Printer

Page 92

Temperature/humidity sensor board

740-7-15

Pre-transfer lamp

Pre-exposure lamp

Housing

Lower rear cover

Temperature/humidity sensor board

Removing the temperature/humidity sensor board

Pre-exposure lamp

Pre-transfer lamp

740-7-14

Removing the pre-exposure lamp and pre-transfer lamp

Service Guide

Page 93

Gear train

Gear train retainer

Frame cross member

Removing the gear train

740-7-18

Phaser 740 Color Printer

Page 94

Tray guides

Removing the tray guides

740-7-17

Service Guide

Page 95

Engine control board

Engine control board bracket

Engine control board

IC 4

Removing the engine control board

Note

Swap NVRAM IC4

consumable life counts and the engine print count. Connector CN28, next to IC4 has no corresponding plug.

. IC4 stores print engine parameters and all

740-7-11

Phaser 740 Color Printer

Page 96

High-voltage board

Warning

Caution

Note

The edges on the inside of the card cage are ragged and sharp and can cut you.

When installing the wiring harness retainer, be careful not to press the wiring harness against the tip of a near by screw which will short the harness. The bent edge of the restraint faces the front of the printer.

The colored orientation stripe of the front panel wiring harness must be oriented up to properly connect with the connector inside the card cage.

Be careful not to short harness here to nearby screw tip

Wiring harnesses

Card cage

Removing the high-voltage board

Cut hazard here

High-voltage board

740-7-16

Service Guide

Page 97

Image processor board

NV RAM

Real Time clock

Boot ROM

Image processor board

Removing the image processor board

740-7-20

Swap components.

The Boot ROM (PLCC), requires using a PLCC extraction tool (003-1633-00)

■

The NVRAM chip (DIP)

■

The Real Time Clock module

■

If you are replacing the image processor board, exchange:

The components contains important customer-created parameters. The printer may not operate correctly without the components being swapped.

Also transfer from the old board to the new board.

The RAM DIMMs

■

The PhaserShare card (if installed)

■

The SCSI card (if installed)

■

Note

If any DIP switches are mounted on the board, they should be set to “0.”

Phaser 740 Color Printer

Page 98

FRU List

This topic provides a list of ﬁeld replaceable units for the printer.

Changes to Tektronix instruments are made to accommodate improved components as they become available. It is important when ordering parts to include the following information:

■

Component's part number.

■

Instrument type or number.

■

Instrument serial number.

■

Modiﬁcation number, if any.

Service Guide

Page 99

Table 1 FRU parts list of the printer cabinet

Fig 1 parts

1 118-9893-00 1 Front door with hinges 2 118-9892-00 1 Upper front cover (operation

3 118-9537-00 1 Right side cover rear 4 118-9208-00 1 Right side cover front 5 118-9894-00 1 Right side cover lower 6 118-9541-00 1 Bottom front cover 7 116-0024-00 1 Output tray (standard)

Part number

118-9996-00 Lower feeder front cover 118-9622-00 Lower feeder left cover 118-9604-00 Lower feeder right cover 118-9606-00 Lower feeder rear cover

Serial number Effective Discont’d

Qty Name and description

panel) w/display board

Figure 1 Cabinet FRUs

3102-26

Phaser 740 Color Printer

Page 100

Table 2 FRU part list of the printer cabinet

Fig 2 parts

Part number

Serial number Effective Discont’d

Qty Name and description

1 118-9891-00 1 Lower rear cover 2 118-9889-00

118-9890-00

1 Upper rear cover (110 VAC)

Upper rear cover (220 VAC) 3 118-9888-00 1 Top cover with logos 4 118-9979-00 1 Left side cover 5 118-9522-00 1 Multi-purpose feed tray assy 6 118-9543-00 1 Left side door assy

Figure 2 Cabinet FRUs

3102-27

Service Guide

Tektronix Z740/N - Phaser 740 Color Laser Printer, Phaser 740, Phaser 740L Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual