Xerox Phaser 740, Phaser 750 Reference Guide

PHASER® 740 and 750 LASER PRINTERS

Service Quick Reference Guide

Warning The following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that contained in operating instructions unless you are qualified to do so.

This printing: Febuary 2000 063-3102-01

Copyright © 1998 by T ektr onix, 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 Tektronix, Inc. TekColor™, PhaserShare™, PhaserMatch™, PhaserLink™, Finepoint™ and PhaserPrint™ are trademarks of Tektronix, Inc. RealSUPPORT and TekColor Care

, Phaser®, and Made for Each Other® are registered trademarks of

are service marks of Tektronix, Inc.

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

TE/mq/mm

Users safety summary

Terms in 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.

Terms on product:

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

CAUTION A personal injury hazard exists that may not be

apparent. For example, a panel may cover the hazardous area. Also applies to a hazard to property including the product itself.

DANGER A personal injury hazard exists in the area where

you see the sign.

Care of product:

Disconnect the power plug 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.

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

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

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

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

Contents

General Information 1

The Phaser 740 Color Printer 2 The Phaser 750 Color Printer 4

Phaser 740 printer RAM and printer capabilities 6

Phaser 750 printer RAM and printer capabilities 8 Print engine assemblies 10 The image processor board 13

Phaser 740 13

Phaser 750 14 Front panel 15

Rear panel 17

Test print button 17

Network card LEDs 18

Health LED (Phaser 740 only) 20

Media tray type sensing 20 Difference between Phaser 740 and 750 22 Specifications 23

Regulatory specifications 26

Error Codes and Messages 27

Error messages 27 Print engine error codes 27

Normal power-up self-tests 35

Troubleshooting 37

System power-up sequence 37 Print engine troubleshooting 38

Testing the print engine 38

Verifying printer operation by using its self-test print 39

Verifying power supply operation 39

Measuring power supply voltages 39 Inspecting the power supply fuses 41 Safety interlocks 41 Testing for a shorted motor 42

Media jams and the paper path 43

Media-based problems 43

Media problems 43 Multiple-sheet pick 44 The media skews passing through the paper path 44 Paper tray indicates empty when it is not 44 No paper feeder installed 45 No imaging unit installed 45

Service Guide

vii

Jams 46

Wrong media 46 Paper mis-picks at the paper tray 46 Paper jams midway in the paper feeder 46 Paper jams at the second bias transfer roller 47 Fuser jams 48 Eject jams 48 Multi-purpose tray feed jams 49 Jams in the duplex unit 49

Figures

The Phaser 740/750 Color Printer 1 Print engine major components 10 Print engine components (continued) 11 Print engine sensor, switch and solenoid locations 12 Features of the image processor board 13 Features of the image processor board 14 The front panel 16 The Phaser 740 rear panel 19 The Phaser 750 rear panel 19 Tray switch sensors and actuators 21 Measuring the DC voltages (test points) 40 Door safety interlock switches 42 Troubleshooting print quality problems 54 Manual color correction reference print 85 The Calibrate for Paper test page 86 Removing cabinet covers 93 Removing cabinet covers 94 Removing the EMI shields 95 Removing the cartridge selector/eject unit 97 Removing the paper feeder 98 Removing the multi-purpose tray pick roller 99 Removing the cork separator pad 100 Removing the laser scanner and driver board 101 Removing the power supply 102 Removing the main motor, paper-feed motor, toner cartridge drive motor and cleaning

board 103 Removing the toner cartridge drive unit, home position sensor and the left door interlock

switch 104 Removing the temperature/humidity sensor board 105 Removing the pre-exposure lamp and pre-transfer lamp 105 Removing the gear train 106 Removing the tray guides 107 Removing the engine control board 108 Removing the high-voltage board 109 Removing the image processor board 110 Removing the image processor board 111 Cabinet FRUs 114 Cabinet FRUs 115 Motor and fan FRUs 117 Sensor, switch and flag FRUs 119

Service Guide

Circuit board and electronic FRUs 121 Imaging and paper feed component FRUs 123 Wiring diagram 135

Tables

Installed RAM and printer capabilities 6 Installed RAM and printer capabilities 8 Tray switch sensor combinations 20 Summary of differences between Phaser 740 and Phaser 750 22 Physical dimensions 23 Printer clearances 23 Functional specifications 24 Electrical specifications 25 Environmental specifications 25 Print engine service error codes 27 Normal power up error codes 35 Phaser 740 print engine service test descriptions 77 Phaser 750 print engine service test descriptions 80 FRU parts list of the printer cabinet 114 FRU part list of the printer cabinet 115 Motors, drive units and fans 116 Sensors, switches and flags 118 Circuit board and electronics 120 Imaging and paper feed components 122 Kits and other hardware 124 Common supplies and accessories 125 Phaser 740 Supplies and accessories 125 Phaser 750 Supplies and accessories 128

xii

Phaser 740 and 750 Color Printers

General Information

A4A4

PAPE

This service guide contains information useful for troubleshooting, repairing, adjusting, and maintaining Tektronix Phaser

740, 740L, and 750 Color Printers. 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 and 750 printer service training.

The Phaser 740/750 Color Printer

3102-01

Service Guide

The Phaser 740 Color Printer

The Phaser 740 Color Printer combines a color laser 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 pr ocessor 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.

■

The

Phaser 740 Plus

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.

is a monochrome version of the printer which can easily be

comes standard with 32 Mbytes of RAM which can be

includes 32 Mbytes of additional memory (64 Mbytes

■

The

Phaser 740 Extended

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 and 750 Color Printers

(a factory-only option) features a different ROM

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 transpar ency 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 two-sided 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 sour ce. The duplex unit upgrade kit includes the optional two-tray feeder. When printing double-sided, print times are generally doubled. Two-sided monochrome printing is at 4 ppm, two-sided 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

The Phaser 750 Color Printer

The Phaser 750 Color Printer combines a color laser 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 an Ethernet port for host communication. The Ethernet port supports EtherTalk 10/100baseT, Novell and TCP/IP. An optional network adapter card allow the printer to communicate with Token Ring networks. A USB port is available on the rear panel to directly connect with a USB-compatible host. The printer supports the color PCL5C printer language too.

The printer is available in four conﬁgurations:

■

The

Phaser 750N

supplemented with an additional 32-, 64- and 128-Mbyte RAM DIMM; maximum usable capacity is 256 Mbytes. The printer contains 136 standard, built-in fonts. The printer contains 136 standard, built-in fonts. The Phaser 750N prints at a color resolution of 1200 x 600 dots-per-inch.

■

The

Phaser 750P

of memory and can print at a higher resolution of 1200 x 1200 dots-per-inch (Premium mode). The Phaser 750P also support image pipelining for greater throughput, a print collation mode (which requires the hard drive option), and a “First Page Preview” mode.

■

The

Phaser 750DP

printer but includes 128 Mbytes of RAM and a Lower Tray Assembly and Duplex Unit.

■

The

Phaser 750DX

Phaser 750DP printers but includes an internal hard drive which enables Print Collation mode. The hard drive also is pre-loaded with manuals, videos and printer drivers.

comes standard with 64 Mbytes of RAM which can be

is the same as the Phaser 750N except it includes 96 Mbytes

has all the features and capabilities of the Phaser 750P

has all the features, RAM, and capabilities of the

Print speeds depend on the chosen resolution and selected media. For resolutions of 1200 x 600 (Enhanced), 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 pagesper-minute.

Phaser 740 and 750 Color Printers

An optional duplex unit allows the printer to automatically create two-sided 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 since both sides of a print are printed. Two-sided monochrome printing is at 4 ppm, two-sided color at 2 ppm.

The printer features Intelligent Ready software which monitors when and how the printer is used. Tracking these patterns over a rolling 3-week period, the printer automatically places itself in standby power-saving modes during periods of non-use. The printer automatically returns to Ready mode, just prior to a a use period, to avoid having users wait for the printer to warm up.

Service Guide

Phaser 740 printer RAM and printer capabilities

The Phaser 740 printer features two DIMM connectors which accept both 16-, 32-, 64-, and 128-Mbytes 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

Pipelining Yes, if SCSI

Frame buffer 1 Letter size

Check print Yes, if SCSI

Collation (requires hard drive)

only

image with compression

Phaser 740 and 750 Color Printers

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 Yes, if SCSI

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

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

For example: Installed RAM: 64 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 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

Maker Part Number

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

Phaser 750 printer RAM and printer capabilities

The Phaser 750 printer features two DIMM connectors which accept 32-, 64-, and 128Mbytes RAM modules. The printer can use off-the-shelf SODIMM meeting these speciﬁcations:

■

144-pin SODIMM

■

Synchronous DRAM

■

PC-100 compliant

■

3.3 volt

■

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 module installed in each slot.

Installed RAM and printer capabilities

Feature 750N

1200 x 600 dpi Color/mono Color/mono Color/mono 1200 x 1200 dpi No Color Color Pipelining Yes Yes Frame buffer 1 Letter size image

Check print No Yes Yes Collation (requires hard

drive)

64 Mbytes

with no compression

No Yes Yes

750P 96 MBytes

2 Letter-size images with compression

750DP/DX 128 Mbyte

2 Letter-sized frame buffers with no image compression

Phaser 740 and 750 Color Printers

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

For example: Installed RAM: 64 Mbytes

Memory Slot 1: SDRAM/parity/64 MB/8LSDT864HG-10EB5 Memory 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 32MB Micron MT4LSDT464HG-10E 64MB Micron MT8LSDT864HG-10E 128MB Micron MT8LSDT1664HG-10E

Maker Part Number

Service Guide

Print engine assemblies

Pre-exposure lamp

Imaging unit

Paper

feeder

Black toner cartridge

Cyan toner cartridge

Magenta toner cartridge

Main charger corona unit

Yellow toner cartridge

Pre-transfer lamp

Ozone filter

Paper tray

Fuser

Toner level sensor board

Laser scanner

Toner cartridge selector/paper exit unit (right door)

3102-0

Print engine major components

Phaser 740 and 750 Color Printers

Toner cartridge

Toner cartridge drive unit

motor

Power supply unit

Engine control board

user

leaning

oard aper feed motor

Main motor

emperature/humidity ensor board

Laser driver board (Phaser 740)

Ozone fan

High voltage board

Image processor board

Interconnect board

Lower door open sensor

3102-03

Print engine components (continued)

Service Guide

Toner level

sensors (transmitters)

Multi-purpose

ray feed

sensor

Transparency sensor (Phaser 750)

ADU jam

Aligning

sensor

Accumulator belt

home position sensor

Paper tray

type sensors

Main charge grid (Scorotron charger) sensor

Paper-empty 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

Paper-exit sensor

ADU gate sensor (inside reverser)

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 and 750 Color Printers

The image processor board

Phaser 740

PostScript code ROM DIMM

Image processor board

Font ROM DIMM

Network Card

CPU

RAM DIMM 2

RAM DIMM 1

NV RAM

Boot ROM

SCSI riser board

Features of the image processor board

Real Time clock

3102-41

Service Guide

Phaser 750

RAM module 2

Network card or

NVRAM

CPU

hard disk drive

Battery (not replaceable)

Features of the image processor board

RAM module 1

PostScript ROM DIMM (updates standard PostScript ROM soldered to board)

3102-43

Phaser 740 and 750 Color Printers

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

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

Toner

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

Ready, Receiving data

Out of paper, Paper Jam

and

Printing

, and

Out of

Buttons

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:

The topic, “Resetting NVRAM” on page 91 explains how to use the front panel buttons to reset the printer’s NVRAM to its factory default values.

Button 1, the left-most button labeled the Exit key, cancels an operation while

■

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 “Phaser 740 service tests” on page 77.

Service Guide

LEDs

The

Power

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

boards.

Error

The

■

LED has three meanings:

Off

indicates that no errors have been detected.

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

, is displayed on the LCD.

Toner

Blinking

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

Paper Jam at Output

Exit

Button 1

Low

, is displayed on the LCD.

Power Error

Button 2

Button 3

Button 4

3102-30

The front panel

Phaser 740 and 750 Color Printers

Rear panel

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

■

Bi-directional parallel (high-density connector). For the Phaser 750, the parallel port can be used to connect to a qualiﬁed optical scanner.

■

Phaser 740 printer: Twisted Pair10baseT Ethernet connector. Phaser 750 printer: Twisted Pair10/100baseT Ethernet connector.

blinks

RX indicator (green); LED is a problem (probably hardware) has occurred at the network hub.

■

Phaser 740 printer only: SCSI high-density connector for connecting an external hard disk drive or optical scanner only). The Phaser 750 printer has no SCSI support.

■

Phaser 750 printer only: USB Type A connector for connecting to a USBcompatible host.

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

■

Phaser 740 printer only: ThinNet (100base2) and Twisted Pair (100baseT) Ethernet connectors. RX indicator (green); receiving data. The LED is LED is network hub.

■

Phaser 740 printer only: LocalTalk connector.

off steady

on steady

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

, a problem (probably hardware) has occurred at the

while the network card is receiving data. The

steady

, then

blinks

while the network card is

off steady

while no data is being received. If the

■

Unshielded Twisted Pair (10baseT) and shielded Twisted Pair (DB-9) Token Ring connectors. The Token Ring card installed disables the built-in Ethernet port.

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 Phaser 740 printer: 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

Network card LEDs

The Ethernet port has two LED indicators. The LEDs are also found on the Ethernet network card used by the Phaser 740 printer:

■ TX indicator (yellow); blinks while data is transmitted to the host. The LED

is off while no data is being sent.

■ T wisted Pair (100baseT) . RX indicator (green); blinks while the network car d

is receiving data. The LED is on steady while no data is being received. If the LED is off steady, then a problem (probably hardware) has occurred at the network hub.

ThinNet (100base2). RX indicator (green); blinks while the network card is receiving data. The LED is off steady while no data is being received. If the LED is on steady, then a problem (probably hardware) has occurred at the network hub.

■ 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 network card or Token Ring network card installed, the builtin Ethernet port is disabled.

The Token Ring network card has two LED indicators:

■ Connection (yellow); off when the printer is not inserted into the Token

Ring, blinks while the printer is attempting to insert itself into the Token Ring, on when the printer is properly inserted in the ring.

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

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

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

18 Phaser 740 and 750 Color Printers

The printer also support an internal IDE hard drive in place a network card as a part

Ethernet Card

LINK

10/100Base-TX

PhaserShare

Series B

100

Mbs

LocalTalk Card

Series B

PhaserShare

Token Ring Card

STP

PhaserShare

Series B

of a factory installed option.

Slot for network card or IDE hard drive

10baseT Ethernet

10/100baseT Ethernet card

SCSI

Parallel

The Phaser 740 rear panel

Slot for network card or IDE drive

USB 10/100baseT

Ethernet

Parallel

10Base2

LocalTalk®

LocalTalk card

Token Ring Card

PhaserShare

Series B

STP

UTP

Mbs

INS

Token Ring card

UTP

Mbs

INS

Token Ring card

IDE Internal Hard Drive

3102-05

The Phaser 750 rear panel

3102-42

Service Guide 19

Health LED (Phaser 740 only)

A health LED indicates the status of the image processor board. The health LED is mounted on the image processor board. 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

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

ﬁlm

20 Phaser 740 and 750 Color Printers

Sensor actuators

Middle

Left

Right

Tray sensors

Tray switch sensors and actuators

3102-31

Service Guide 21

Difference between Phaser 740 and 750

Summary of differences between Phaser 740 and Phaser 750

Phaser 750 unique part Details

Main board The main board is based on a faster 603E processor running

RAM modules The Phaser 750 printer uses100 Mhz, laptop computer-style

10/100baseT Ethernet Built-in, autoswitching 10/100baseT Ethernet port available on

New Enhanced print quality The Phaser 750 features a 4 page-per-minute, 1200 x 600 dpi

Intelligent Ready mode Built-in Intelligent Ready software tracks usage patterns and

Euro currency symbol Euro currency symbol added to the internal PostScript fonts. Embedded Pages Numerous built-in printable Help pages Scanner support Support for approved scanners as a optical copier through the

No font DIMM All f onts are a vailable in the PostScript ROMs soldered on the

Paper feeder The Phaser 750 printer’s paper feeder, which is customer

New supported media The Phaser 750 printer support Executive-size paper

Front panel The Phaser 750 printer features, new, easier-to-navigate

at 200 MHz. It features a new rear panel with built-in10/100BaseT and no SCSI port. The large Dallas NVRAM chip is no longer used. Also, the Phaser 750 IP board has no removable Boot ROM chip. A battery on the main board will support the real-time clock (10 year life). The printer supports up to 256 Mbytes of RAM. Only a Token Ring Card and an IDE Internal Hard Drive are available.

RAM modules in SODIMM connectors

all Phaser 750 printer models

Enhanced print mode as its default mode.

places the printer in Standby mode during periods of non-use and wakes-up the printer prior to a use period.

parallel port.

main board or in the snap-in PostScript ROM module which override the built-in ROMs. The Kanji font is available on a PostScript DIMM. Other Asian fonts are only available on an optional internal hard drive.

replaceable, features quic k-release tabs to facilitate removing the paper feeder. It also features a transparency sensor. The paper feeder is not reverse compatible to the Phaser 740 printer.

(7.25 x 10.5 in.) from the Multi-Purpose Tray.

menus.

22 Phaser 740 and 750 Color Printers

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.

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:

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

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

Service Guide 23

Functional speciﬁcations

Characteristic Speciﬁcation

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

Addressability Standard, Fast Color and Presentation mode: 600 x 600

Printing speed (A, A4, Legal paper)

Minimum printing margins

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

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

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

Time from paper-load to paper-eject for continuous A, A4 printing: Four-color 4 ppm at 600 x 600 dpi (Phaser 740) paper: 4 ppm at 1200 x 600 (Phaser 750)

Monochrome: 16 ppm at 600 dpi Time from paper-load to paper-eject for continuous Legal printing:

Four-color 2 ppm at 600 dpi paper: 1 ppm at 1200 dpi Monochrome: 8 ppm at 600 dpi

Four-color transparency: 2 ppm Fast color, three-color (CMY): 5.3 ppm 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

2 ppm at 1200 x 1200 dpi 8 ppm at 1200 dpi

4 ppm at 1200 dpi

(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.) Executive-size paper (7.25 x 10.5 in.) #10 Envelope of a good quality. Tektronix-brand Glossy Coated paper Tektronix-brand Label media Tektronix-brand Cover Stock paper Tektronix-brand transparency ﬁlm Only Tektronix-brand A- and A4-size transparency ﬁlm is supported. Multi-purpose tray paper weight: Cover Stock up to 163 g/m2 (60 lb) Index Stock up to 163 g/m2 (90 lb)

Two-sided printing: 75 to 90 g/m2 (20 to 24 lb)

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

transparency tray. The optional Lower Tra y Assemb ly also uses tr ays with the same capacity.

24 Phaser 740 and 750 Color Printers

Electrical speciﬁcations

Characteristic Speciﬁcation

Primary line voltages 90 to 132 VAC (115 VAC or 100 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

198 to 264 VAC (220 VAC nominal) 50 to 60 Hz

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

220 VA C 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 Part 15 Class B VDE Class B EN60555-2 Class A VCCI (CISPR 22) Class B

Environmental speciﬁcations

Characteristic Speciﬁcation

Best print quality obtained

Temperature Operating Non-operating Storage

Humidity Operating Non-operating

Altitude Operating Non-operating

Vibration/shock Operating

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

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

With in 15.5

15.5o to 32.5o C (60oto 91oF)

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

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

standby mode is 47 dbA.

to 25.5oC (60o to 78oF) and 30 to 65% RH

Service Guide 25

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

26 Phaser 740 and 750 Color Printers

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, or Stopped

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

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

. The bottom line indicates the

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 control board.

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.

(respectively)

toner cartridge

Service Guide

Print engine service error codes

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

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 and 750 Color Printers

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

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 loc ked 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:

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 and 750 Color Printers

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.

43 Fuser temperature rising too slow error.

Fuser roll exhausted error.

off end of the roll.

Replace the fuser roll with new assembly and cycle power on printer (at least 3 seconds off)

Replace the fuser.

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.

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

Replace the fuser.

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

4. Replace the engine control board.

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.

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 fuser.

6. Replace the power supply and the fuser (Phaser 740 only).

Oil web has gone or is about to go

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

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. Replace the tray sensor board.

2. 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.

53 Transparency sensor error

1. Clear media jam

2. Replace paper feed unit.

60 Multi-purpose tray pick-up roller motor error

1. Is the tray ov er-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 control 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.

32 Phaser 740 and 750 Color Printers

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 control board.

64 Lower Tray Assembly error.

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

2. Ensure that the Lower T ray Assemb ly 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 33

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

84 Parity error.

engine control board.

1. Make sure the toner cartridges are installed, then cycle printer power.

2. Reset the image processor NVRAM.

3. Check the connection between the image processor board and

the engine control board.

4. Replace the image process board.

5. Replace 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.

34 Phaser 740 and 750 Color Printers

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 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 36p DIMM1 Data Paths

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

2. Reset the NVRAM

3. Replace the Code ROM

SIMM

4. Replace the RAM DIMMs

5. Replace the image

processor board

6. Replace the font SIMM (if installed on Phaser 740)

7. Replace the image processor to engine board cable

8. Replace the engine control board

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

Service Guide 35

36 Phaser 740 and 750 Color Printers

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

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 39.

Observe that the to the later topic “Verifying power supply operation” on page 39.

Phaser 740 printer only: V erify that the image pr ocessor’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.

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 39.

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 39.

Ready

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

Phaser 740 and 750 Color Printers

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

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

Press 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.

Ready

message is displayed, press the

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

button to enter the menu.

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:

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

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

With the VOM set to measur e AC voltages, measure for power being

: With the power switch on, is the main fan running? If not,

Service Guide

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 41.

If the +5 and +24 VDC voltages measure correctly, but the printer does not operate correctly, then proceed to the topic, “Safety interlocks” on page 41.

Phaser 740 and 750 Color Printers

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.

T est the functionality of the interlock using the service tests described in “Phaser 740 service tests” on page 77.

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

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

Testing for a shorted motor

Remove the cabinet top and rear access panel.

Refer to the topic “Wiring Diagram” on page 135 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.

Phaser 740 and 750 Color Printers

3102-07

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

T est the paper path using the service tests described in “Phaser 740 service tests” on page 77 or “Phaser 750 service tests” on page 80.

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 slickﬁnish 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 24.

Service Guide

Multiple-sheet pick

Is the paper in good condition and appropriate for a laser printer? Quality of ﬁce 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 “Phaser 740 service tests” on page 77 or “Phaser 750 service tests” on page 80.

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.

Phaser 740 and 750 Color Printers

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.

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 “Phaser 740 service tests” on page 77 or “Phaser 750 service tests” on page 80.

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

Service Guide

Jams

Wrong media

1. Ensure the correct media type is loaded in the correct tray.

2. Test the media sensors

3. Replace the paper feeder.

Paper mis-picks at the paper tray

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

2. Is the printer printing within its environmental speciﬁcations?

3. 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.

4. Does the pick roller rotate? Mark the end of the pick roller shaft. Open the fr ont

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.

5. 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

1. Ensure that the pick-up rollers are clean.

2. Check the left side door for burrs or foreign obstructions that could block the

movement of a sheet of paper.

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

4. 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.

5. Does the pick-up roller clutch work properly?

46 Phaser 740 and 750 Color Printers

Try printing using a different paper tray.

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

T ray Assembly.

Paper jams at the second bias transfer roller

1. Clean the intermediate rollers.

2. Is the transfer roller correctly installed?

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

4. 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.

5. Does the drive intermediate roller rotate? If not, check the gear train driving the

gears for proper installation and for broken teeth.

6. Check the left side door for burrs or foreign obstructions that could block the

movement of a sheet of paper.

7. 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.

8. Clean the aligning rollers.

9. 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.

11. Check the spring pressure at each end of the aligning r ollers. 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.

Service Guide 47

Fuser jams

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

2. Is the printer printing within its environmental speciﬁcations?

3. Is this a duplex print with heavy printing (lots of toner coverage) on the ﬁrst-

printed side? Print the light-printing side ﬁrst.

4. Is the heat shield plate at the entrance of the fuser loose and obstructing the

paper path?

5. Inspect the fuser’s gear train leading to the paper feed motor. Does it rotate

properly? Do any of the gears show broken teeth?

6. Does the fuser exit sensor ﬂag properly actuate its sensor?

7. Inspect the wiring harnesses leading from the cartridge sensor/eject unit to

CN21 of the engine control board.

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

9. Observe if the exit rollers rotate during the print process. If they do not, r einstall

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.

Eject jams

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

curling?

2. Is the printer printing within its environmental speciﬁcations?

3. 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.

4. 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.

5. Clean all the eject rollers.

6. 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.

7. Does the paper exit sensor ﬂag properly actuate its sensor?

8. Inspect the wiring harness leading from the cartridge sensor/eject unit to

CN308 of the engine driver board.

9. Replace the cartridge selector/eject unit.

10. Replace the engine control board.

48 Phaser 740 and 750 Color Printers

Multi-purpose tray feed jams

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

2. Is the printer printing within its environmental speciﬁcations?

3. 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).

4. Clean or replace the multi-purpose feed pick roller.

5. Is the picked media properly interrupting the aligning sensor?

6. Is the multi-purpose feed sensor empty ﬂag properly interrupting the multi-

purpose pick sensor?

7. 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.

8. Check the wiring harness leading from the paper feeder to the engine control

board (connector CN20).

9. Replace the paper feeder circuit board.

10. Replace the engine control board.

Jams in the duplex unit

1. Is the duplex unit correctly installed?

2. Clean the rollers inside the auto-duplex unit.

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

4. Does the duplex unit’s clutch operate correctly? Refer to “Phaser 740 service

tests” on page 77 or “Phaser 750 service tests” on page 80.

5. Inspect the duplex unit’s electrical connector for damage.

6. Replace the duplex unit.

Service Guide 49

Printing and print quality problems

Required tools

■ #1 Phillips screwdriver ■ Conductive grease

■ Volt-ohm-meter (VOM) ■ Ruler

The following ﬂow chart represent an effective, systematic means of troubleshooting print quality. Following the chart are examples of print quality defects and probable solutions.

Start

Does the

front panel display

a message to

replace a supply

item?

Print the Diagnostic Test Pages

(DTP)

Is the print

quality problem

on only one solid

color page?

Is the

customer using

a media type that

is NOT on the

supported

list?

Is the printed image offsetting or are the prints

smudged?

Yes

Replace the

indicated

supply item

Replace that color's toner

cartridge

Try a

supported

media

Run the

Clean

for Smudges

procedure

Print quality is

acceptable.

Stop

Is the

entire image too

light or too dark?

Is the

environment outside

the printer's

specifications?

Based on

TEKSMART, is the

print quality problem

a documented printer

limitation or unsup-

portable customer

expectation?

Yes

Perform the

Calibrate for

Paper

adjustment

Perform the

Calibrate

Colors

procedure

Move the

printer to an

operating

environment

that is within

specifications

Help establish

customer

expectations

or escalate

Print the Supplies

Page

Is the

print quality

problem repeated

more than once

on each

page?

Yes

troubleshooting

which supply

item to replace

Use the

following

images to determine

Troubleshooting print quality problems

54 Phaser 740 and 750 Color Printers

Does the

imaging unit or the

fuser have less than

20% life

remaining?

Yes

Swap that

supply item

Make an

unfused

Diagnostic Test

Page print

Has the print

quality problem

disappeared on the

unfused print?

Reseat the transfer kit and make a normal Diagnostic Test

Page print

Cut about 3 inches off the length of a piece of paper. Place it in the MPT and select the MPT as the default tray. Request a Diagnostic Test Page. The printer will display a jam message. Open the left side door; use the blue handles to pull out the paper feeder. Being careful not to get toner on yourself, carefully slide the paper out of the printer. Slide the paper feeder back into the printer and close the door.

Yes

Replace the

fuser

Is the

Diagnostic Test

Page print quality

OK?

Is the

print quality

problem dark streaks

down the length of

the page?

Replace the

imaging unit

Yes

Clean or

replace the

main charge

grid

3102-46

Service Guide 55

Blank print

1. 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.

2. Replace the laser unit.

3. Replace the imaging unit.

4. Determine if the cartridge selector is pushing the toner cartridges into contact

with the photoconductive drum.

5. Replace the toner cartridge drive unit.

6. Replace the cartridge sector/eject unit.

7. Replace the engine driver board.

All-black print

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

grid.

2. Inspect the main charge grid for a broken corona wir e. Replace the main charge

grid.

3. Replace the high-voltage board

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

5. Replace the engine control board.

56 Phaser 740 and 750 Color Printers

Single color mottled or with non-uniform density streaks

If a single color displays a mottled appearance or if a single color shows many vertical streaks of varying densities, then that color’s toner cartridge is running of toner. Replace the cartridge.

Dark vertical line in print, single color

If the line is of one primary color , then the trouble can usually be traced to a defect in the color’s toner cartridge. Too much toner is transferred from the developer roller to the photoconductive belt at the defect point.

9922-93

Vertical line in print, all colors

The problem may be caused by a dirty main charger, a defect in the fuser or a defect in the imaging unit.

9922-78

Service Guide 57

Vertical line or scratch in print, single color

If the scratch is of one missing primary color, then the trouble can usually be traced to a scratch in the developer roller of the missing toner’s toner cartridge. No toner is transferred from the developer roller to the photoconductive belt at the defect point.

Vertical line or scratch in print, all colors

The problem may be caused by contamination on the laser window where the laser beam exits the laser scanner and enters the imaging unit. Since the blocked laser beam cannot discharge the portion of the photoconductive belt it cannot reach, toner will not transfer to those portions of the belt. Consequently a blank, vertical line will appear on the prints in all colors. Remove the imaging unit and, with a squeeze bulb, blow any dust or toner off of the window (located in the “ceiling” of the cavity left in the printer once the imaging unit is removed).

If it is in all colors then the problem may be in the imaging unit, such as a scratched photoconductive belt. Replace the imaging unit.

9922-75

A very thin, white line could be caused by a scratched roller in the fuser which replacing will solve. The scratch in the print may not be continuous but rather a set of in-line vertical scratches. Inspect the fuser roller and the print. If the scratches are about 12.1 cm (5 in.) apart and match the defects on the print, then the problem is a scratch on the fuser roller. Replace the fuser.

Lastly, a protrusion of some kind in the paper path could be scratching the print.

58 Phaser 740 and 750 Color Printers

Small, repeating light dot in one color in-line with each other

This can usually be traced to a dent-like defect in the developer roller of the toner cartridge in question. Measure the spacing between the spots. The distance between the repeating spots indicates the source of the problem.

In some instances, the spots may be dark instead of white. They may also be shaped something other than round.

■ The dents should be 3.4 cm (1.5 in)

apart or 2.5 cm (1 in.) for 1200 dpi printing. No toner is transferred from the developer roller to the photoconductive belt at the defect point.

■ If the spots are about 12.5 cm (5 in.)

apart, then the problem is a defect on the fuser roller. Replace the fuser.

■ 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 (br own gr ease) 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.

9922-76

Service Guide 59

Single light, horizontal line in all the prints

This is probably caused by a defective photoconductive belt onto which toner will not transfer.

1. Replace the imaging unit.

2. Replace the second bias transfer

roller. Inspect it for loose roller contacts. Grease the end of the roller shaft with conductive grease.

Large, random light smudges

Spots such as those illustrated are caused by ﬁngerprints on the photoconductive or accumulator belt. Often, the smudges will gradually fade with additional printing. Alternately, the imaging unit will have to be replaced.

9922-78

Fingerprints can be removed by applying some toner (any color) to the ﬁngerprints and rubbing lightly with a cotton-tipped swab. Don’t remove the toner . The printer will remove the toner with its cleaning blade. Remember not to

expose the imaging unit to ambient light for more than a minute.

60 Phaser 740 and 750 Color Printers

9697-50

One or more dark vertical line in all colors

This can often be traced to a dirty scorotron charger (main char ger) cor ona wire. Contamination (dust or toner) interferes with the ﬂow of electrons from the wire to the photoconductive drum. Toner is then transferred to the area of low electron charge and consequently to the accumulator belt and ﬁnally the print.

1. Inspect the main charger for toner

or other contamination. White streaks are caused by a dirty grid. Black streaks are caused by a dirty wire. If contaminated, its charge wire will appear fuzzy. Replace the scorotron charger, if necessary.

1. Inspect the photoconductive belt for

damage. Replace the imaging unit if necessary.

2. Inspect the path the laser beam

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

9322-89

3. If the line is colored, one toner cartridge may not be outputting toner correctly.

Replace the missing color’s toner cartridge.

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

the roller if necessary.

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

6. Are the fuser rollers scratched? Replace the fuser.

Service Guide 61

Dark, irregular, vertical streaks and smears on the entire page

This is usually due to the accumulator belt toner waste bin being ﬁlled and spilling out on the belt. The spilled toner is then being transferred to the print. Most prominent in the middle of the print and in the yellow band. A defective cleaning blade could also cause this. In either case, replacing the imaging unit should ﬁx the problem.

Alternately, replace fuser.

One primary color faded or pale OR a single color has a dark vertical streak

9697-52

This indicates a problem with a single toner cartridge. Replacing the toner cartridge should ﬁx the problem.

If it does not, there may be a problem with the toner cartridge selector/eject unit. It may not be pushing the cartridge quite far enough to make proper contact with the photoconductive belt, resulting in poor toner transfer. Replace the toner cartridge selector/eject unit.

Lastly, poor electro-mechanical contact my be the problem, although this usually shows itself as light, horizontal streaks and lines. Replace the toner cartridge biasing assembly.

62 Phaser 740 and 750 Color Printers

9697-53

Light, faded, pale prints

1. The imaging unit is old or has been

exposed to too much room light. Replace the imaging unit.

2. Is the paper in good condition and

appropriate for a laser printer?

3. Is the printer printing within its

environmental speciﬁcations? For the Phaser 750 printer, print the built-in Diagnostic Test Page; the current temperature and humidity is printed on the page.

4. Check the media type and tray type

for proper match. If printing is weak on paper only, the printer may be printing in transparency mode. Does the media in the multipurpose feeder match the default setting made using the front panel? Check to see if paper was picked from a transparency tray or if the multi-purpose tray is set for Transparency.

5. For desired paper, run the front panel routine Calibrate for Paper.

6. Check to see if the Color Calibration menu is set to print lighter.

7. The high-voltage board is not outputting sufﬁcient voltage to the second bias

transfer roller, causing poor transfer of toner to paper. Likewise, low voltage to the toner cartridge will cause insufﬁcient transfer of toner to the photoconductive belt.

9697-51

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

roller.

9. The beam from the laser scanner is weak and is not properly exposing the

photoconductive belt. Poor laser exposure results in the negative charges remaining on the photoconductive belt instead of being “erased” by the laser beam, thereby retarding toner transfer from the toner cartridges. Replace the laser scanner.

10. Inspect the path the laser beam travels for contamination.

11. Inspect the action of the cartridge selector to ensure that it is pushing the toner

cartridges into full contact with the photoconductive drum.

12. Replace the imaging unit.

13. Replace the second bias transfer roller.

14. Replace the engine control board.

Service Guide 63

Single white spot appear in the same place on the print

This indicates a bad spot has developed on the imaging unit’s photoconductive belt which will not transfer toner. The imaging unit must be replaced. If the spot appears to migrate vertically from print to print then the defect is on the imaging unit’s accumulator belt. In either case the imaging unit must be replaced.

Contamination of one color by another

This is most noticeable on solid primary ﬁlls. This is caused by a defective photoconductive cleaning blade. The blade is not scraping off all of the untransferred toner from the previous pass of the photoconductive belt to the accumulator belt prior to the next toner’s transfer to the photoconductive belt. Replacing the imaging unit corrects this problem.

9697-54

Rarely, a sheet of paper can become folded and jam in the imaging unit, smudging the image.

64 Phaser 740 and 750 Color Printers

9322-90

Missing primary color

1. Replace the toner cartridge of the

missing color.

2. Determine if the cartridge selector

is pushing the toner cartridges into contact with the photoconductive drum.

3. Check the wiring harness leading

from the cartridge selector/eject unit to CN308 of the engine control board.

4. Replace the toner cartridge drive

unit.

5. Replace the engine driver board.

6. Phaser 750 printer only. Run the

printer calibration routine Calibrate for Paper available from the front

panel Help/Printer Quality menu.

Mis-transfer, missing portions of toner

1. Inspect the heat roller (top roller) of

the fuser for scratches or contamination.

9697-55

2. Ensure the media is correct for the

printer.

3. Replace the fuser.

9697-56

Service Guide 65

Dirty background

1. Inspect the scorotron charger for toner or other contamination.

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

toner cartridge.

3. Replace the high-voltage board.

4. Dirty background can occur if the customer prints prolonged volumes of

monochrome (single primary color) prints. Replace the toner cartridge that is overused.

5. Check color calibration adjust values.

Stains on the back of the print

1. Replace transfer kit.

2. Empty the waste bin of the second bias transfer roller.

3. Clean the paper path of the paper feeder.

4. Inspect the fuser rollers for contamination. Replace the fuser.

5. Replace the paper feeder.

Some stains may appear on the back of Legal-size media. This is a limitation of the print engine.

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 , r esulting in a second use of the color to be darker in the same areas as the ﬁrst image. This r esults in the ﬁrst image ghosting into the second image when the same color is used.

1. A new toner cartridge exhibits less ghosting. Ghosting increase as toner

cartridges age.

Unfused or partially fused printing

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

2. Is the printer printing within its environmental speciﬁcations?

3. Run 10 to 20 blank sheets of paper through the printer.

4. Replace the fuser unit.

66 Phaser 740 and 750 Color Printers

Image is skewed on the paper

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

2. Is the printer printing within its environmental speciﬁcations?

3. Swap the tray that the affected print originates from.

4. Ensure that the paper feeder is properly installed. Inspect its paper pick roller.

Look for obstructions in the paper path.

5. Clean the intermediate and aligning rollers.

6. Replace the paper feeder.

No printing on edge of print

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

2. 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.

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

condition. Replace the cartridge selector/eject unit.

4. Replace the imaging unit.

Image is not centered on the print when it should be

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

2. Is the printer printing within its environmental speciﬁcations?

3. Ensure the paper feeder is properly installed.

4. Is the top and left margin adjustments correct? Refer to the service tests

discussed in the topic “Printer self-diagnostics” on page 77.

5. Clean the intermediate and aligning rollers.

6. Replace the paper feeder.

7. Replace the engine control board.

8. Replace the laser scanner.

Service Guide 67

The print is wrinkled

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

fuser.

2. Is the paper in good condition and appropriate size, weight, grain and grade for

a laser printer?

3. Is the printer printing within its environmental speciﬁcations?

4. 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).

5. 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.

68 Phaser 740 and 750 Color Printers

Macintosh printing problems

Image never prints

The printer indicates it is receiving data, but no print comes out of printer or the printer goes back to Ready to Print mode without printing an image.

1. Make sure that the correct printer icon was selected in the Chooser. Try

printing the job again. Try printing a different ﬁle or from a different application.

2. 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.

3. Download the Echo showpage snippet which produces a blank sheet of paper,

to determine if the printer is receiving and processing ﬁles.

4. Make sure you are printing with the correct PPD ﬁle.

5. Activate Error Handler using the front panel Advanced Printer Settings

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 for further assistance. Please have the error page in hand.

6. 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 is application- or network-related.

Image is rotated 90 degrees

1. In the application's Page Setup, make sure that the image is selected to print

in Portrait or Landscape orientation, as you expect.

Image prints in black-and-white

1. In the Chooser, ensure a color printer icon is displayed next to the Phaser

740 or Phaser 750 in the list of available printers. This indicates the printer’s PPD has been selected and conﬁgured.

2. In the Print dialog box, make sure that the Color/Grayscale option has been

selected.

3. Make sure that the Phaser 740 or 750 printer icon was selected in the

Chooser. Try printing the job again.

4. Check the version of your LaserW riter driver to ensure that it is version 8 .0.x

or higher. Earlier versions of the driver do not support color PostScript.

5. The application may require special instructions to print, such as those

contained in a .PPD ﬁle; check in the Phaser 740 Printer CD-ROM or Phaser 750 Printer CD-ROM.

Service Guide 69

Printer isn’t in the Chooser

1. Ensure that the printer is turned on and the rear panel health light is

ﬂashing at a regular rate.

2. Check the Network or AppleTalk control panel to ensure the proper

network or zone is selected.

3. Power-cycle the printer.

4. Check to see if the printer has not been renamed or placed in another zone.

You can print a Conﬁguration Page, which lists this EtherTalk information as well as other information about the printer.

5. Verify the EtherTalk settings on the printer’s Conﬁguration Page.

6. Verify that the printer is correctly cabled to the network and that the

Ethernet cable functions properly.

7. Locate and remove and Windows NT shar ed printers that have captur ed the

AppleTalk queue for the printer.

8. Verify the driver version for the built-in Ethernet port on a Macintosh G3.

9. Reset the printer’s NVRAM settings.

10. Disable QuickDraw GX

Windows printing problems

Image never prints

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

1. From the printer driver, under the printer's set up options, set

TRANSMISSION RETRY = 850.

70 Phaser 740 and 750 Color Printers

Interpreting the Supplies Page

Several pieces of information about each of the printer’s consumables are listed on the Supplies Page.

Life remaining gauges

Gauges indicate the remaining life of each consumable. The toner cartridges indicate if more than enough toner remains to print more that 500 prints at 5% coverage. The other consumables’ life gauges indicate remaining life as a percentage.

The life-remaining information for the imaging unit and the fuser is kept with those consumables. The life-remaining information for the other consumables is maintained by the printer and can be confused if the consumables are replaced when the printer did not indicate that they should be replaced.

Date installed

The date installed is indicated for the imaging unit, fuser, main charge grid and fuser roll.

Toner coverage

The imaging unit and the fuser also indicate the average toner coverage of the prints that have passed though each unit. The greater the toner coverage the shorter the life of the imaging unit and the fuser.

Print counts

In the corner of the information box for the imaging unit, fuser, main charge grid, transfer kit and fuser roll is a hexidecimal number. The hexidecimal number indicates the number of prints that have been processed through that unit.

Service Guide 71

Print count conversions

The print counts indicated of the printer’s Supplies Page are printed in hexidecimal form.

To convert hexadecimal to decimal use the following information:

x value Decimal equivalent

He 00 11 22 33 44 55 66 77 88 99 A10 B11 C12 D13 E14 F15

For example: The hexadecimal value 13FA

breaks down into: 13 FA 1 is 1 3 is 3 F is 15 A is 10

For the For the For the For the 4th column 3rd column 3rd column 3rd column multiply multiply multiply multiply 1 x 16

3 by 16

15 by16

10 by 16

(1 x 163) (3 x 162) (15 x 161) (10 x 160) (1 x 4096)

(3 x 256) (15 x 16) (10 x 1)

4096 768 240 10 Add the column values together

4096 + 768 + 240 +10 = 5114 13FA’s decimal equivalent is 5114

72 Phaser 740 and 750 Color Printers

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

Printing test prints on the Phaser 740 printer

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.

Press the

With the menu item. Press

Printing the demonstration pages

Demo pages demonstrate the capabilities of the printer.

button.

Help pages

menu item. Press

button.

Help pages

menu displayed, scroll to the

Service Print 1

Configuration Page

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.

Phaser 740 and 750 Color Printers

Printing test prints on the Phaser 750 printer

Printing the Diagnostic Test Pages and Solid Fill Test Page

The Diagnostic T est Pages prints allow you to evaluate the printer’s print quality. The pages consist of four pages of 25% tint primary color ﬁlls, one page of all for colors at 25% ﬁll, and a page describing how to interpret the prints. The Solid Fill Test Page prints a solid-ﬁll red print.

Press the

Scroll to the menu item

With the

Pages

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.

Press the

Scroll to the menu item

Help

button.

Print Quality

Help Pages

Solid Fill Test Page

Configuration

Configuration Page

menu displayed, scroll to the

button.

menu item. Press

menu item and press

and press

Diagnostic Test

. Scroll to the

Printing the demonstration pages

Demo pages demonstrate the capabilities of the printer.

Press the

Scroll to the page of your choice and press

button.

Printer Demo

menu item and press

. Scroll to the demo

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 10 seconds the Test Print button in the center of the upper rear cover.

Service Guide

Embedded pages (Phaser 750 printer only)

The Phaser 750 printer contains several embedded pages which can be printed from the front panel. The embedded pages contain information for the user regarding media, troubleshooting the printer, networking the printer, supplies and calibrating the printer for paper.

To access most of the embedded pages:

Press the

Scroll to the menu item

Scroll to the sub-menu item you want and press

Most of the embedded pages are located in the Help Pages menu item. The Network Setup embedded page is located in the Conﬁguration menu as well as the Help/ Printer Administration Menu item.

Help

button.

Print Quality

Help Pages

and press the

and press

button.

. Select the page

Phaser 740 and 750 Color Printers

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 91. This also reset the NVRAM of an installed network card.

Phaser 740 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

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.

” appears on the

Phaser 740 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

Engine Set Margins Top Margin

Front Margin Back Left Margin

Paper Path Top Tray

Middle T ra y Multi-purpose T ray Bottom T ra y

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 Tension Middle T r ay Sw3 Charger Unit Installed Bottom Tray Paper IUT Position Bottom Tray Sw1 Multi-purpose T ray‘ Bottom Tra y Sw2

Media Multi-purpose T ray Pick Bottom T ray Sw3

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

Motor T ests 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 ray 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

Phaser 740 and 750 Color Printers

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 Erase 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 General Status Status: <Reports Engine Status>

Help Turn Help On/off For Each Image Processor And

- Engineering Use Only-

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

Engine Menu

Service Guide

Phaser 750 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

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.

Phaser 750 print engine service test descriptions

Category Test

Print menu map General Status

Paper Path Lets you deﬁne how you would like to exercise the paper path

Set Margins This menu item lets you adjust the printer’s top margin and the front and

Prints a menu map describing the diagnostic menu structure

Provides current print engine status information

Status:

Reports engine status

Upper Tray: Tray size/type Middle Tray: Tray size/type Lower Tray: Tray size/type Engine Control Board ROM version: Version number Fuser Temperature: Temperature in Celsius Ambient Humidity: % relative humidity Ambient Temperature: Temperature in Celsius

Which tray to pick from (Upper, Middle, Lower, MPT)? Which print mode to run paper (600 dpi, 1200 dpi)? Do you want to use the reverser (face up, face down)? Do you want 1 sheets or continuous feed (single, continuos)? Do you want to duplex (1-sided or 2-sided)?

back left margins.

” appears on the

Phaser 740 and 750 Color Printers

Sensors This menu item tests you test the printer sensors by manually toggling

them and watching the results on the front panel

Front/Right Door Switches: closed/open Left Access Door: closed/open Lower Feeder Door: closed/open Fuser installed: installed/absent Fuser Roll Installed: installed/absent Fuser Roll: new/used Imaging Unit Installed: installed/absent Accumulator Belt Tension Set: set/unset Main Charge Grid Installed: set/unset OPC Position: home/not home IUT Position: home/not home MPT Media: active/inactive MPT Pick Roller Position: home/not home Registration Roller: active/inactive Fuser Exit: active/inactive Paper Exit: active/inactive Output T ra y: active/inactive Autoduplex jam: active/inactive Antoduplex Gate: active/inactive T op Tray paper: active/inactive Top Tray Switch 1: active/inactive Top Tray Switch 2: active/inactive Top Tray Switch 3: active/inactive Middle T ra y Paper: active/inactive Middle Tray Switch 1: active/inactive Middle Tray Switch 2: active/inactive Middle Tray Switch 3: active/inactive Bottom T ra y Paper: active/inactive Bottom Tray Switch 1: active/inactive Bottom Tray Switch 2: active/inactive Bottom Tray Switch 3: active/inactive Black Light Detect: always off/a toggle from off/on Cyan Light Detect: always off/a toggle from off/on Magenta Light Detect: always off/a toggle from off/on Yellow Light Detect: always off/a toggle from off/on Transparency sensor: on = transparency/ no media, off = paper

Service Guide 81

Motors/Fan Tests This menu item lets you test individual printer motors and reports a

Clutch T est This menu item lets you test each printer clutch. After starting a clutch

Solenoid T ests This menu item lets you test each printer solenoid. After starting a

pass/fail at the front panel. Always have all tray and supplies installed; otherwise the tests will fail.

Main motor paper Feed Motor Cartridge Motor Laser Motor Lower Feeder Motor Filter Fan Power Supply Fan fuser Fan Autoduplex Unit Fan MPT Motor Black Cam Motor/Sensor Yellow Cam Motor/Sensor Magenta Cam Motor/Sensor Cyan Cam Motor/Sensor Cycle All Cam Motors

test, always wait for the Stop prompt before ending the test.

Black Cartridge Clutch Yellow Cartridge Clutch Magenta Cartridge Clutch Cyan Cartridge Clutch Registration Clutch Auto-Duplex Unit Clutch

clutch test, always wait for the Stop prompt before ending the test.

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

82 Phaser 740 and 750 Color Printers

Command Engine This menu item lets you run individual engine commands to test printer

Miscellaneous T ests This menu item allows you to test other printer subsystems

Maintenance This menu item lets you run several maintenance processes

Image Processor Test This single routine runs a series of diagnostic tests on the image Engine Status This is an engineering test which gives status reports in hex codes

subsystems. After starting one of the Motor test ON, scroll to the motor test that turns it OFF.

Main Motor On/Off Paper Feed Motor On/Off Cartridge Motor On/Off Laser Motor On/Off Lower Feeder Motor On/Off MPT Motor On/Off High Voltage Supply On/Off Erase Lamp On/Off All Fans On/Off Paper To Exit Black Cam On/Off Yellow Cam On/Off Cyan Cam On/Off Magenta Cam On/Off Black Roller On/Off Yellow Roller On/Off Cyan Roller On/Off Magenta Roller On/Off Registration Clutch Paper to Auto-Duplex Top Pick Roller Middle Pick Roller Bottom Pick Roller Transfer Roller Cleaning Blade Face Up/Down Solenoid Fuser Roller Advance Solenoid Blow New Fuser Roll

Erase lamp Energy Star HHS Laser Scanner Seal

Clean Accumulator Belt Clean Top Pick Roller Clean Middle Pick Roller Clean Bottom Pick Roller Clean MPT Pick Roller

processor board and reports a Pass/Fail message on the front panels

Service Guide 83

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

Phaser 740

1. Press the Menu button on the front panel to scroll the Calibrate Colors

menu.

2. Press the right arrow to scroll to the Adjust each color menu item. Pr ess

Menu to enter the Adjust Each Color menu.

3. Press Print to print a reference print showing the printer’s current

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.

Phaser 750

1. Press the Help button on the front panel to scroll the Print Quality menu.

2. Scroll to the Calibrate Colors menu item. Press Menu and then select

either Adjust Light/Dark or Adjust Each Color.

3. For the Adjust Light/Dark menu item, press the left or right arrows to alter

the light/dark setting from -10 (dark) to +10 (light). Press OK to conﬁ rm the selection.

For the Adjust Each Color menu item, press Print to print a reference print showing the printer’s current 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.

84 Phaser 740 and 750 Color Printers

Color Reference Page

Cyan Magenta Yellow Black

-4

-6

-2

+10

-9

-7

-5

-3

-1

-4

-2

+10

-9

-7

-5

-3

-1

9698-18

Manual color correction reference print

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

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.

5. Press the right arrow on the front panel to scr oll to the Adjust <color>:+0

menu for the primary color you wish to change.

6. 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 OK. An “*” indicates the selected value.

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

8. Press Exit to leave the Color Calibration menus.

Service Guide 85

Calibrate for paper (Phaser 750 only)

The Calibrate for Paper menu adjust the printer for the grade of non-Tektronix paper being printed on, as well as compensate for the current environmental conditions. This adjustment applies only to Standard and Enhanced mode printing; Premium mode is not affected by this adjustment. You may have to readjust the printer if you switch to a different brand or grade of paper or if the temperature or humidity changes signiﬁcantly. The difference created by this calibration function may not be apparent for prints made when the relative humidity is over 20%.

1. Press the Help button on the front panel to scroll the Print Quality menu.

2. Scroll to the Calibrate for Paper menu item and press Print. The printer

will print out 11 test pages.

3. Look at each of the 11 References Pages printed by the printer. Each prints

with a different transfer setting: (-10, -8, -6, -4, -2, 0, +2, +4, +6, +8, +10).

4. After deciding which page looks best on your brand or grade of paper, enter

in the front panel menu Adjust Transfer Setting the transfer setting value (-10 to +10) of the page that looks best.

Phaser

750 Color Printer

Calibrate for Paper

The Calibrate for Paper menu

as compensate for the current environmental conditions. This adjustment applies only to Standard and Enhanced mode printing; Premium mode is not affected by this adjustment. You may have to readjust the printer if you switch to a different brand or grade of paper or if the temperature or humidity changes significantly.

Step 1.

Review each of the Reference pages.

Look at each of the 11 References Pages printed by the printer. Each prints with a different transfer setting: (-10, -8, -6, -4, -2, 0, +2, +4, +6, +8, +10).

Step 2.

Select a Transfer Setting based on your

evaluation of the prints.

After deciding which page looks best in the front panel menu Adjust Transfer Setting the transfer setting value (-10 to +10) of the page that looks best.

helps you adjust the printer for the grade of non-Tektronix paper you print on, as well

This page was printed with Transfer Setting = <<<>>

on your paper

, enter

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z abcdefghijklmnopqrstuvwxyz

The Calibrate for Paper test page

86 Phaser 740 and 750 Color Printers

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

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 of f the pre-exposur e lamp bezel and the pr e-transfer lamp bezel with a lint-free wipe.

11.

Vacuum out the interior of the printer.

Phaser 740 and 750 Color Printers

Xerox Phaser 740, Phaser 750 Reference Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Figures

Tables

General Information

The Phaser 740 Color Printer

The Phaser 750 Color Printer

Phaser 740 printer RAM and printer capabilities

Phaser 750 printer RAM and printer capabilities

Print engine assemblies

The image processor board

Phaser 740

Phaser 750

Front panel

Rear panel

Test print button

Network card LEDs

Health LED (Phaser 740 only)

Media tray type sensing

Difference between Phaser 740 and 750

Error Codes and Messages

Error messages

Print engine error codes

Normal power-up self-tests

Troubleshooting

System power-up sequence

Print engine troubleshooting

Testing the print engine

Verifying power supply operation

Measuring power supply voltages

Inspecting the power supply fuses

Safety interlocks

Media jams and the paper path

Media-based problems

Media problems

Multiple-sheet pick

The media skews passing through the paper path

Paper tray indicates empty when it is not

No paper feeder installed

No imaging unit installed

Jams

Wrong media

Paper mis-picks at the paper tray

Paper jams midway in the paper feeder

Paper jams at the second bias transfer roller

Fuser jams

Eject jams

Multi-purpose tray feed jams

Jams in the duplex unit

Other problems

The printer continuously displays “Initializing”

No toner cartridge installed message when it is

No fuser installed message when it is

No fuser roll installed message when it is

Front door open when it is closed

Left-side door open message when it is not

High temperature error

Low temperature error

High voltage error

Thermistor open error

Front panel cycling between READY and WARMING UP

Erratic printer behavior

Installed RAM not recognized

Printing and print quality problems

Blank print

Single color mottled or with non-uniform density streaks

Vertical line in print, all colors

Vertical line or scratch in print, single color

Vertical line or scratch in print, all colors

Large, random light smudges

One or more dark vertical line in all colors

One primary color faded or pale OR a single color has a dark vertical streak

Single white spot appear in the same place on the print

Ghosting

Image is skewed on the paper

Image is not centered on the print when it should be

The print is wrinkled

Image never prints