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

+ 118 hidden pages