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01_gen-info.pdfGeneral Information This service guide contains information useful for troubleshooting, repairing, adjusting, and maintaining a Tektronix Phaser® 740 and 740L Color Printer. This manual includes troubleshooting guides, adjustment procedures and a field replaceable units (FRU) list. Topics such as printer theory of operation, detailed removal/replacement procedures, configuration page details, and verifying printer operation are located on the companion Color Printer Service & Support Resources CD-ROM. To ensure a complete understanding of the product, we recommend participation in Phaser 740 service training. A4 R PE PA 3102-01 The Phaser 740 Color Printer Service Guide 1 The Phaser 740 Color Printer The Phaser 740 Color Printer combines a color laser, continuous-tone print engine with an image processor supporting Adobe's PostScript Level 3 page description language. The image processor features a bi-directional parallel interface and a 10baseT Ethernet port for host communicat
02_error codes.pdfError Codes and Messages Error messages Generally, the top line of the two-line front panel display indicates the printer's status, such as Ready, Printing, Busy, or Stopped. The bottom line indicates the 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. 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 1, 2, 3, 4 Meaning of error code and what to do about it Black, Cyan, Magenta, Yellow (respectively) toner cartridge movement error. 1. Push the indicated toner cartridge toward the imaging unit. Does it require more force to push that cartridge than the other toner cartridges? 2. Inspect the wir
02_errorcodes.pdfError Codes and Messages Error messages Generally, the top line of the two-line front panel display indicates the printer's status, such as Ready, Printing, Busy, or Stopped. The bottom line indicates the 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. 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 1, 2, 3, 4 Meaning of error code and what to do about it Black, Cyan, Magenta, Yellow (respectively) toner cartridge movement error. 1. Push the indicated toner cartridge toward the imaging unit. Does it require more force to push that cartridge than the other toner cartridges? 2. Inspect the wir
03_troubleshoot.pdfTroubleshooting This topic discusses troubleshooting the printer. Troubleshooting is discussed with two approaches: s 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. s 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: s s s s 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 ins
04_adjust.pdfService 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 s s Magnifying lens (preferably illuminating) Phillips screwdriver Service Guide 55 Printing test prints The prints printed via the front panel are generated by the image processor. While the printer is idle you can use the front panel to print an image stored in the image processor such as the Configuration Page. Print service test prints The service prints allow you to evaluate the printer's print quality. Service Print 1 is four pages of 25% tint primary color fills and one page of all for colors at 25% fill. Service Print 2 prints a 600 and 1200 dpi test pattern as well as a solid-fill red print. 1. Press the Menu button. 2. With the Help pages menu displayed, scroll to
05_clean.pdfCleaning 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: s s s The standard pick roller The multi-purpose pick roller (should be replaced
06_nvram.pdfResetting NVRAM Resetting NVRAM returns all the image processor's NVRAM-stored parameters to their factory defaults except the print counts and the Adobe firmware serial number. To reset the image processor to its factory default values, follow this procedure: 1. Turn the printer off. 2. Press and hold the front panel Buttons 1 (Exit) and 4. 3. Turn the printer on. 4. When the front panel displays the message NVRAM Default, release Buttons 1 and 4. 5. At this point the message password? will be displayed. Within 10 seconds, press Buttons 1 (Exit) and 3 at the same time. The NVRAM parameters will be reset to their factory default values. If you do not press buttons 1 and 3 in the allotted time, the NVRAM will not be changed. Service Guide 67 68 Phaser 740 Color Printer
07_disass.pdfKey FRU Disassembly This topic illustrates how to remove and replace key printer Field Replaceable Units (FRUs). Refer to the later topic "FRU List" on page 87 for a list of the printer's FRUs. For more detailed removal/replacement procedures refer to the Phaser 740 Service CDROM. Printer cabinet Top cover Hinge frame Conical spring Hinge pin Door Retainer hooks Left side cover Upper rear cover Lower rear cover Multi-purpose tray Left door 740-7-1 Removing cabinet covers Service Guide 69 Toner level sensor board Right side covers Rear Front Upper front cover Front door Bottom front cover (lift printer to remove) Lower (lift printer to remove) 740-7-2 Removing cabinet covers 70 Phaser 740 Color Printer EMI shields EMI shield Interconnect wiring shield 740-7-3 Removing the EMI shields Note Unplug the engine-to-image processor cable from the engine control board. Service Guide 71 Cartridge selector/eject unit (right door) 1. Disconnect the cartridge selector/eject u
08_fru.pdfFRU List This topic provides a list of field replaceable units for the printer. Changes to Tektronix instruments are made to accommodate improved components as they become available. It is important when ordering parts to include the following information: s s s s Component's part number. Instrument type or number. Instrument serial number. Modification number, if any. Service Guide 87 Table 1 FRU parts list of the printer cabinet Fig 1 parts 1 2 3 4 5 6 7 Part number 118-9893-00 118-9892-00 118-9537-00 118-9208-00 118-9894-00 118-9541-00 116-0024-00 118-9996-00 118-9622-00 118-9604-00 118-9606-00 Serial number Effective Discont'd Qty 1 1 1 1 1 1 1 Name and description Front door with hinges Upper front cover (operation panel) w/display board Right side cover rear Right side cover front Right side cover lower Bottom front cover Output tray (standard) Lower feeder front cover Lower feeder left cover Lower feeder right cover Lower feeder rear cover 7 3 2 4 4 6 5 1 3102-26 Figure
09_testprint.pdfTest Prints This appendix illustrates the test prints produced by the print engine. It also illustrates a number of defective prints and the reason for the defects. The topic "Printing and print quality problems" on page 47 discusses solutions to the problems shown in this appendix. Consumables Print consists of four 25% tint primary color bands and "gas gauges" for each consumable. Service Print 1 prints out four 25% tint full page fills, each page one primary color. Service Print 2 produces a 1200 dpi test print, a solid red fill prints and a 600 dpi test print. From the Help Pages menu in the front panel, select Consumables Page Consumables page <-----> Print Toner Black OK Page Remaining: >500 @ 5% coverage Your average coverage/page: TBD% Power Error Magenta = OK Cyan OK Yellow OK Page Remaining: >500 @ 5% coverage Your average coverage/page: TBD% Page Remaining: >500 @ 5% coverage Your average coverage/page: TBD% Page Remaining: >500 @ 5% coverage Your average coverage/pag
10_wiring-fold.pdfWiring Diagram Laser driver CN 1 CN 2 Front panel CN 1 CN 501 CN 502 Interconnect board J490 SCSI Laser scanner CN 4 CN 29 CN 8 CN 7 CN 11 CN 14 CN 2 CN 1 Toner cartridge sub bias board J711 J712 Image processor Parallel Network card J900 J530 High voltage power supply board CN 701 FTR DEV STR CHG PTC GRID Orange Yellow Black Red White Blue Power supply fan CN 301 CN 30 Toner cartridge level sensor (Receiver) and roller clutch board CN 6 CN 619 CN 620 CN 621 CN622 CN623 B Y M C CN 1 Door-open switch Power switch Power supply CN 201 CN 204 CN 25 Engine control board Pre-exposure lamp CN 12 CN 630 CN 10 Charger unit connector Imaging unit Fuser Front door right door closed sensors CN 2 CN 13 CN 632 Accumulator belt position sensor CN 9 Ozone fan Toner cartridge level (transmitter) sensor Pre-transfer lamp CN 607 Temperture/ humidity sensors CN 27 CN 5 CN 23 Left door closed sensor Fuser fan Paper-feed motor Developer cartridge drive motor Main motor Cleani
11_notes.pdfService Guide 115 116 Phaser 740 Color Printer
confi740.pdfThe Configuration Page To provide further diagnostic information, the printer is able to print a Configuration Page. The Configuration Page lists the values the printer stores in its NVRAM. These values can be informative when troubleshooting the printer, particularly networked operations. The Configuration Page gives information such as: s General information about the printer, such as page count, the printer name, Ethernet address, time-outs, number of fonts. Details regarding installed memory Color settings such and Vivid Color. Parallel port settings LocalTalk port settings EtherTalk settings Token Ring settings TCP/IP settings Novell NetWare settings s s s s s s s s Phaser 740 Online Service Information BACK TO MAIN 1 Configuration page settings for a Phaser 740 printer Parameter Printer type Printer name Description The name of the product. The current name of the printer as seen on a network Saved in Default NVRAM yes yes Phaser 740 same as the name of the p
Contents.pdfContents General Information 1 The Phaser 740 Color Printer 2 RAM and printer capabilities 4 Print engine assemblies 6 The image processor board 9 Front panel 10 Rear panel 12 Network card LEDs 12 Test print button 13 Health LED 14 Media tray type sensing 14 Specifications 16 Regulatory specifications 19 Error Codes and Messages 21 Error messages 21 Print engine error codes 21 Normal power-up self-tests 29 Troubleshooting 31 System power-up sequence 31 Print engine troubleshooting 32 Testing the print engine 32 Verifying printer operation by using its self-test print 33 Verifying power supply operation 33 Measuring power supply voltages 33 Inspecting the power supply fuses 35 Safety interlocks 35 Testing for a shorted motor 37 Media jams and the paper path 37 Media-based problems 37 Media problems 37 Multiple-sheet pick 38 The media skews passing through the paper path 38 Paper tray indicates empty when it is not 38 No paper feeder installed 39 No imaging unit installed 39 Se
disas740.pdfFRU Disassembly/Assembly This topic explains how to remove and replace many of the printer's Field Replaceable Units (FRUs). This topic covers procedures for FRUs that are difficult to remove or require special handling or precautions. Phaser 740 Online Service Information BACK TO MAIN 1 The printer cabinet Upper rear cover 1. Remove the four screws securing the upper rear cover in place. Top cover Hinge frame Conical spring Hinge pin Door Retainer hooks Left side cover Lower rear cover Note Note that the lower rear cover clips underneath the printer frame. Lift the printer slightly to remove the lower rear cover in the next step. Upper rear cover 1. Remove the four screws securing the lower rear cover in place. 2. Unlatch the temperature/humidity sensor assembly from the rear panel. Top cover 1. Remove the upper rear cover first. 2. Remove the three screws securing the rear of the top cover in place. 3. The front of the top cover is held by metal tabs. Tilt the cover up from th
Frontis740.pdfPHASER® 740 and 740L LASER PRINTERS S e rv ic e Q u ic k Re f e re n c e G u id e Warning The following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that contained in operating instructions unless you are qualified to do so. This printing: May 1999 063-3102-00 Copyright © 1998 by Tektronix, Inc., Wilsonville, Oregon. Printed in the United States of America. All rights reserved. Contents of this publication may not be reproduced in any form without permission of Tektronix, Inc. Tektronix®, Phaser®, and Made for Each Other® are registered trademarks of Tektronix, Inc. TekColorTM, PhaserShareTM, PhaserMatchTM, PhaserLinkTM, FinepointTM and PhaserPrintTM are trademarks of Tektronix, Inc. RealSUPPORTSM and TekColor CareSM are service marks of Tektronix, Inc. Other marks are trademarks or registered trademarks of the companies with which they are associated. September 1998. First printing November
fru740-1.pdfItem: 1 Part Number: 118-9893-00 Serial number: Quantity: Description: 1 Front door with hinges 7 3 2 4 4 6 5 1 3102-26 1 MAIN FRU LIST Item: 2 Part Number: 118-9892-00 Serial number: Quantity: Description: 1 Upper front cover (operation panel) w/ display board 7 3 2 4 4 6 5 1 3102-26 2 MAIN FRU LIST Item: 3 Part Number: 118-9537-00 Serial number: Quantity: Description: 1 Right side cover rear 7 3 2 4 4 6 5 1 3102-26 3 MAIN FRU LIST Item: 4 Part Number: 118-9208-00 Serial number: Quantity: Description: 1 Right side cover front 7 3 2 4 4 6 5 1 3102-26 4 MAIN FRU LIST Item: 5 Part Number: 118-9894-00 Serial number: Quantity: Description: 1 Right side cover lower 7 3 2 4 4 6 5 1 3102-26 5 MAIN FRU LIST Item: 6 Part Number: 118-9541-00 Serial number: Quantity: Description: 1 Bottom front cover 7 3 2 4 4 6 5 1 3102-26 6 MAIN FRU LIST Item: 7 Part Number: 116-9536-00 Serial number: Quantity: Description: 1 Output tray (standard)
fru740-2.pdfItem: 1 Part Number: 118-9891-00 Serial number: Quantity: Description: 1 Lower rear cover 3 2 4 5 1 6 3102-27 1 MAIN FRU LIST Item: 2 Part Number: 118-9889-00 118-9890-00 Serial number: Quantity: Description: 1 Upper rear cover (110 VAC) Upper rear cover (220 VAC) 3 2 4 5 1 6 3102-27 2 MAIN FRU LIST Item: 3 Part Number: 118-9888-00 Serial number: Quantity: Description: 1 Top cover with logos 3 2 4 5 1 6 3102-27 3 MAIN FRU LIST Item: 4 Part Number: 118-9979-00 Serial number: Quantity: Description: 1 Left side cover 3 2 4 5 1 6 3102-27 4 MAIN FRU LIST Item: 5 Part Number: 118-9522-00 Serial number: Quantity: Description: 1 Multi-purpose feed tray assy 3 2 4 5 1 6 3102-27 5 MAIN FRU LIST Item: 6 Part Number: 118-9543-00 Serial number: Quantity: Description: 1 Left side door assy 3 2 4 5 1 6 3102-27 6 MAIN FRU LIST
fru740-3.pdfItem: 1 Part Number: 118-9897-00 Serial number: Quantity: Description: 1 Toner cartridge selector/paper-eject unit 1 3 5 2 6 4 9 8 7 10 1 3102-37 MAIN FRU LIST Item: 2 Part Number: 118-9551-00 Serial number: Quantity: Description: 1 Fan, power supply 1 3 5 2 6 4 9 8 7 10 2 3102-37 MAIN FRU LIST Item: 3 Part Number: 118-9905-00 Serial number: Quantity: Description: 1 Toner cartridge drive motor 1 3 5 2 6 4 9 8 7 10 3 3102-37 MAIN FRU LIST Item: 4 Part Number: 118-9514-00 Serial number: Quantity: Description: 1 Toner cartridge drive unit 1 3 5 2 6 4 9 8 7 10 4 3102-37 MAIN FRU LIST Item: 5 Part Number: 118-9524-00 Serial number: Quantity: Description: 1 Fan, ozone filter 1 3 5 2 6 4 9 8 7 10 5 3102-37 MAIN FRU LIST Item: 6 Part Number: 118-9553-00 Serial number: Quantity: Description: 1 Gear kit, Main motor drive Motor compound gear Intermediate compound gear 1 3 5 2 6 4 9 8 7 10 6 3102-37
fru740-4.pdfItem: 1 Part Number: 118-9552-00 Serial number: Quantity: Description: 1 Switch, front/right door open sensor 1 2 4 8 3 7 6 5 1 MAIN FRU LIST Item: 2 Part Number: 118-9547-00 Serial number: Quantity: Description: 1 Toner level sensor board 1 2 4 8 3 7 6 5 2 MAIN FRU LIST Item: 3 Part Number: 118-9558-00 Serial number: 1 Quantity: Description: Paper feed flag kit Paper tray empty Multi-purpose tray entrance flag Jam at A flag Output tray full flag 2 4 8 3 7 6 5 3 MAIN FRU LIST Item: 4 Part Number: 118-9913-00 Serial number: Quantity: Description: 1 Tray sensor board 1 2 4 8 3 7 6 5 4 MAIN FRU LIST Item: 5 Part Number: 118-9550-00 Serial number: Quantity: Description: 1 Left-side door-open switch 1 2 4 8 3 7 6 5 5 MAIN FRU LIST Item: 6 Part Number: 118-9519-00 Serial number: Quantity: Description: 1 Accumulator belt home-position sensor assembly 1 2 4 8 3 7 6 5 6 MAIN FRU LIST Item: 7 Part Number: 118-9918-00 Serial numb
fru740-5.pdfItem: 1 Part Number: 118-9978-00 Serial number: Quantity: Description: 1 Laser motor driver board 1 1 2 2 12 12 17 17 11 11 10 10 16 16 14 14 13 13 15 15 3 3 8 8 4 4 1 9 9 7 7 6 6 5 5 3102-38 3102-38 MAIN FRU LIST Item: 2 Part Number: 118-9898-00 Serial number: Quantity: Description: 1 High-voltage board 1 1 2 2 12 12 17 17 11 11 10 10 16 16 14 14 13 13 15 15 3 3 8 8 4 4 2 9 9 7 7 6 6 5 5 3102-38 3102-38 MAIN FRU LIST Item: 3 Part Number: 671-4380-80 Serial number: Quantity: Description: 1 Image processing board 1 1 2 2 12 12 17 17 11 11 10 10 16 16 14 14 13 13 15 15 3 3 8 8 4 4 3 9 9 7 7 6 6 5 5 3102-38 3102-38 MAIN FRU LIST Item: 4 Part Number: 156-4758-10 156-4800-10 156-4811-10 156-4780-10 1 1 Serial number: Quantity: Description: 1 16-Mbyte RAM DIMM 1 32-Mbyte RAM DIMM 1 64-Mbyte RAM DIMM 1 128-Mbyte RAM DIMM 2 2 12 12 17 17 11 11 10 10 16 16 14 14 13 13 15 15 3 3 8 8 4 4 4 9 9 7 7 6 6 5 5 3102-38 3102-38 MAIN F
fru740-6.pdfItem: 1 Part Number: 118-9901-00 Serial number: Quantity: Description: 1 Laser scanner unit 1 2 3 9 5 4 7 6 8 1 3102-39 MAIN FRU LIST Item: 2 Part Number: 118-9546-00 Serial number: Quantity: Description: 1 Pre-transfer lamp 1 2 3 9 5 4 7 6 8 2 3102-39 MAIN FRU LIST Item: 3 Part Number: 118-9549-00 Serial number: Quantity: Description: 1 Pre-exposure erase lamp 1 2 3 9 5 4 7 6 8 3 3102-39 MAIN FRU LIST Item: 4 Part Number: 118-9895-00 Serial number: Quantity: Description: 1 Paper feeder 1 2 3 9 5 4 7 6 8 4 3102-39 MAIN FRU LIST Item: 5 Part Number: 118-9896-00 Serial number: Quantity: Description: 1 Multi-purpose tray kit pick roller pad spring pick pad 1 2 3 9 5 4 7 6 8 5 3102-39 MAIN FRU LIST Item: 6 Part Number: 118-9563-00 Serial number: Quantity: Description: 2 D-roller, paper feed 1 2 3 9 5 4 7 6 8 6 3102-39 MAIN FRU LIST Item: 7 Part Number: 118-9912-00 Serial number: Quantity: Descripti
fru740.pdfField Replaceable Parts MAIN FRU LIST It is important when ordering parts to include the following information: s s s Component's part number Product type or model number Serial number of the printer Serial numbering. Particular fields in the serial number indicate the modification level of the printer, the date of its manufacture and the sequence number of the printer produced on that day. The serial number is coded as follows: JLxxDMY J indicates the headquarter country of the manufacturing company, Japan. L indicates the modification level of the printer, ranging alpha-numerically from 0 to Z. xx alpha-numerically indicates the sequence of the printer among the printers produce on that day of manufacture, ranging from 01 to ZZ representing 1 to 1296 (the letters I and O are not used). D alpha-numerically indicates the day of manufacture, ranging from 1 to X representing 1 to 31 (the letters I and O are not used). M alpha-numerically indicates the month of manufacture, ranging f
Link740.pdfPhaser 740 Color Printer Online Service Files About the Configuration Page Theory of Operation Verifying Printer Operation Disasembly/Assembly of the Printer Field Replaceable Units Tools List BACK TO MAIN Phaser 740 Online Service Information 1
theo740.pdfTheory of Operation Overview This topic covers the theory of operation of each subsystem within the printer: s s s s s s Functional block diagram Imaging Fusing Paper path Power supply Image processor Phaser 740 Online Service Information BACK TO MAIN 1 Functional block diagram The printer is made of eight major blocks: s s s s s s s s Imaging unit Laser scanner Toner cartridges Fuser Engine control board Power supplies Mechanicals Image processor board Phaser 740 Online Service Information BACK TO MAIN 2 Imaging unit The imaging unit forms the heart of the printer. This customer-replaceable unit contains the photoconductive belt and accumulator belt on which imaging takes place. Laser scanner The laser scanner is the device that "writes" the image onto the imaging unit's photoconductive belt. Toner cartridges Four toner cartridges, black, yellow, cyan and magenta, contain the primary color toners. Each toner cartridge feature a voltage-biased developer that sequentially tran
tool740.pdfRequired tools s s s s s Needle-nose pliers Diagonal cutters Flat-blade screwdriver 90% isopropyl alcohol Magnetic-tip screwdrivers; 3-inch shaft and 6-inch shaft: s s s s Spring removal tool Conductive grease Gear grease 003-1623-00 006-7998-00 006-7436-00 #2 Phillips tip -- extended shank 343-0549-00 006-7056-00 067-1433-00 003-0236-00 003-1496-00 003-1497-00 003-1498-00 006-7971-00 ® s s s s s s s s Replacement cable ties Antistatic mat Test pattern generator Tweezers 115 VAC toner vacuum 220 VAC toner vacuum Toner filters for vacuum Light shield/drape Phaser 740 Online Service Information BACK TO MAIN 1
veri740.pdfVerifying the Printer and Host Connections In this chapter, you verify that the host computer can send files to the printer. This chapter assumes that the printer and the printer drivers have been properly installed. Verifying printing from a PC Direct DOS connection verification Verify that the PC can communicate with the printer. 1. Power up the printer and the PC. If the PC is running under Windows, exit Windows so that the PC is operating under DOS alone. 2. At the DOS prompt, type (in lowercase) the following: echo showpage > port: Substitute port: with LPT1:, LPT2: etc. or whichever corresponds to the port the printer is attached to. The printer should respond by picking, processing, and ejecting a blank sheet of paper; if this does not happen, check your cabling. Phaser 740 Online Service Information BACK TO MAIN 1 Windows 95 driver verification Using the Windows Write application, verify that the PC, running under Windows 95, can print to the printer. 1. If it is not alre
_Contents740.pdfContents General Information 1 The Phaser 740 Color Printer 2 RAM and printer capabilities 4 Print engine assemblies 6 The image processor board 9 Front panel 10 Rear panel 12 Network card LEDs 12 Test print button 13 Health LED 14 Media tray type sensing 14 Specifications 16 Regulatory specifications 19 Error Codes and Messages 21 Error messages 21 Print engine error codes 21 Normal power-up self-tests 29 Troubleshooting 31 System power-up sequence 31 Print engine troubleshooting 32 Testing the print engine 32 Verifying printer operation by using its self-test print 33 Verifying power supply operation 33 Measuring power supply voltages 33 Inspecting the power supply fuses 35 Safety interlocks 35 Testing for a shorted motor 37 Media jams and the paper path 37 Media-based problems 37 Media problems 37 Multiple-sheet pick 38 The media skews passing through the paper path 38 Paper tray indicates empty when it is not 38 No paper feeder installed 39 No imaging unit installed 39 Serv

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