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Canon LBP5050 Series, Service Manual

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Canon LBP5050 Series Service Manual Download Page 29

Chapter 2

2-3

2.4 IMAGE FORMATION SYSTEM

2.4.1 Overview/Configuration

2.4.1.1 Outline

0018-6673

LBP5050N / LBP5050 

The image-formation system is the central hub of the printer. It forms the toner image on the media.
The following are the main components of the image-formation system:

- Four toner cartridges
- ITB
- Laser scanner unit
- Fixing unit

The DC controller controls the laser scanner unit and high-voltage power supply to form the toner image on the photosensitive drums according to the VIDEO
signals. The image is transferred to the print media through the ITB and fixed.

F-2-3

2.4.1.2 Image-formation Process

0018-6675

LBP5050N / LBP5050 

The image-formation process consists of the following nine steps divided among six functional blocks:
Block 1: Latent image formation

Step 1: Primary charging
Step 2: Laser-beam exposure

Block 2: Development

Step 3: Development

Block 3: Transfer

Step 4: Primary transfer
Step 5: Secondary transfer
Step 6: Separation

Block 4: Fixing

Step 7: Fixing

Block 5: ITB cleaning

Step 8: ITB cleaning

Block 6: Photosensitive drum cleaning

Step 9: Drum cleaning

DC controller

High-voltage power supply

Laser scanner unit

Photosensitive drum

Secondary
transfer rollet

Primary transfer pad

ITB

Tonner cartridge

Laser beam

ITB cleaning unit

Fixing unit

Summary of Contents for LBP5050 Series

Page 1: ...Aug 13 2008 Service Manual LBP5050 Series ...

Page 2: ......

Page 3: ... need arises In the event of major changes in the contents of this manual over a long or short period Canon will issue a new edition of this manual The following paragraph does not apply to any countries where such provisions are inconsistent with local law Trademarks The product names and company names used in this manual are the registered trademarks of the individual companies Copyright This ma...

Page 4: ...quiring care to avoid combustion fire Indicates an item prohibiting disassembly to avoid electric shocks or problems Indicates an item requiring disconnection of the power plug from the electric outlet Indicates an item intended to provide notes assisting the understanding of the topic in question Indicates an item of reference assisting the understanding of the topic in question Provides a descri...

Page 5: ...sed to indicate Low The voltage value how ever differs from circuit to circuit In addition the asterisk as in DRMD indicates that the DRMD signal goes on when 0 In practically all cases the internal mechanisms of a microprocessor cannot be checked in the field Therefore the operations of the microprocessors used in the machines are not discussed they are explained in terms of from sensors to the i...

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Page 7: ...2 3 1 1 Outline 2 2 2 3 2 Laser Scanner Motor Control 2 2 2 3 2 1 Fault Detection 2 2 2 4 IMAGE FORMATION SYSTEM 2 3 2 4 1 Overview Configuration 2 3 2 4 1 1 Outline 2 3 2 4 1 2 Image formation Process 2 3 2 4 1 3 Latent image formation block 2 4 2 4 1 4 Development block 2 4 2 4 1 5 Transfer block 2 5 2 4 1 6 Fixing block 2 6 2 4 1 7 ITB cleaning block 2 6 2 4 1 8 Photosensitive drum cleaning blo...

Page 8: ...ain Controller 2 17 2 8 2 1 Outline 2 17 2 8 2 2 Overview of the Block 2 17 Chapter 3 DISASSEMBLY AND ASSEMBLY 3 1 EXTERNAL AND CONTROLS SYSTEM 3 1 3 1 1 Rear Cover 3 1 3 1 1 1 Before Removing the Rear Door 3 1 3 1 1 2 Removing the Rear Door 3 1 3 1 2 Rear Side Cover 3 1 3 1 2 1 Before Removing the Rear Side Cover 3 1 3 1 2 2 Removing the Rear Side Cover 3 1 3 1 3 Rear Upper Cover 3 1 3 1 3 1 Befo...

Page 9: ...RE SYSTEM 3 13 3 2 1 Laser Scanner Unit 3 13 3 2 1 1 Before Removing the Laser Scanner Unit 3 13 3 2 1 2 Removing the Laser Scanner Unit 3 13 3 2 1 3 After Replacing the laser scanner unit 3 15 3 3 IMAGE FORMATION SYSTEM 3 15 3 3 1 Intermediate Transfer Unit 3 15 3 3 1 1 Before Removing the ITB Unit 3 15 3 3 1 2 Removing the ITB Unit 3 16 3 4 PICKUP FEEDING DELIVERY SYSTEM 3 17 3 4 1 Cassette Pick...

Page 10: ...B 5 1 5 1 4 Adjustment of Fixing System 5 2 5 1 4 1 Nip width specifications 5 2 5 2 SERVICE TOOLS 5 3 5 2 1 Standard Tools 5 3 5 2 2 Solvents and Oils 5 3 5 3 ERROR CODE 5 3 5 3 1 Error code 5 3 5 4 Version Up 5 6 5 4 1 Outline 5 6 5 4 1 1 Overview of Version Upgrading 5 6 5 5 Service Mode 5 6 5 5 1 Outline 5 6 5 5 1 1 Outline 5 6 5 5 2 Service Mode Table 5 7 5 5 2 1 Service Mode Items 5 7 5 5 2 ...

Page 11: ...Chapter 1 PRODUCT DESCRIPTION ...

Page 12: ......

Page 13: ...fications 1 2 1 3 1 Print Speed 1 2 1 4 Name of Parts 1 3 1 4 1 External View 1 3 1 4 2 Cross Sectional View 1 4 1 5 Using the Machine 1 5 1 5 1 Control Panel 1 5 1 6 Safety 1 6 1 6 1 Safety of the Laser Light 1 6 1 6 2 CDRH Regulation 1 6 1 6 3 Handling the Laser Unit 1 6 1 6 4 Points to note at disassembly installation procedure 1 7 ...

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Page 15: ... single component dry toner Warm up time Instant warm up 25 seconds or less after the printer is turned on at 20 deg C Image margin Leading edge 5 0 1 5 1 5mm Image margin Trailing edge 5 0 1 5 1 5mm Image margin Left right 5 0 1 0 1 0mm Number of gradations 16 gradations Printing resolution 600dpi x 600dpi First print time B W 22 sec or less Color 28 sec or less When printing A4 paper Print speed...

Page 16: ...te printing Approx 255 W or less Average during standby Approx 11 W or less Average during operation 220 240 V Color printing Approx 207 W or less Black and white printing Approx 253 W or less Average during standby Approx 12 W or less LBP5050N Average during operation 110 127 V Color printing Approx 210 W or less Black and white printing Approx 255 W or less Average during standby Approx 15 W or ...

Page 17: ...050 F 1 1 F 1 2 1 Front Cover 5 Paper Guides 2 Manual Feed Slot 6 Power Switch 3 Paper Cassette 7 Manual Feed Slot Cover 4 Manual Feed Guide 8 Output Tray 1 Rear Cover 5 ERR Indicator Orange 2 Power Socket 6 USB Port 3 100 Indicator Green 7 Ethernet Port 4 LNK Indicator Green ...

Page 18: ...g unit 8 ITB unit 2 Delivery roller 9 Pickup roller 3 Cartridge 10 Separation roller 4 Laser scanner unit 11 Registration roller 5 Photosensitive drum 12 Secondary transfer roller 6 Manual feed roller 13 Fixing film 7 Primary transfer pad 14 Pressure roller 1 2 3 4 6 7 8 9 10 11 12 13 14 ...

Page 19: ...king There is no paper or paper of the correct size is not loaded 3 Paper Jam Indicator Blinking A paper jam has occurred and printing cannot be performed 4 Alarm Indicator Blinking An error has occurred and printing cannot be performed On A service error has occurred 5 Ready Indicator Blinking The printer is busy printing warming up or cleaning On The printer is ready to print 6 Cancel Job Indica...

Page 20: ...d Radiological Health CDRH of Food and Drug Administration in U S has implemented a regulation regarding laser products on Au gust 2nd 1976 This regulation is applied to all products manufactured since August 1st 1976 and prohibits the sale of laser products without certification The following labels certify compliance with the CDRH regulations and must be attached to all laser products that are s...

Page 21: ...on 2 At installation follow the procedure in the reverse order of disassembly unless otherwise instructed 3 Be careful of the screw type length diameter and corresponding part 4 To check the electrical conductivity washer equipped screw is used to attach the grounding wire and the varistor etc When attaching them be sure to use this screw 5 In principle do not operate the machine without any part ...

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Page 23: ...Chapter 2 TECHNICAL REFERENCE ...

Page 24: ......

Page 25: ...D max control 2 8 2 4 3 3 Image gradation correction control D half control 2 9 2 4 3 4 Color displacement correction control 2 9 2 4 4 Toner Cartridge 2 9 2 4 4 1 Developing roller engagement disengagement control 2 9 2 4 5 Transfer Unit 2 9 2 4 5 1 Pad transfer 2 9 2 5 Pickup Feeding Delivery System 2 10 2 5 1 Overview Configuration 2 10 2 5 1 1 Outline 2 10 2 5 2 Detecting Jams 2 11 2 5 2 1 Jam...

Page 26: ...failure detection 2 14 2 7 EXTERNAL AND CONTROLS SYSTEM 2 14 2 7 1 Power Supply 2 14 2 7 1 1 Power Supply 2 14 2 7 1 1 1 Low voltage power supply 2 14 2 7 1 2 Other Function 2 15 2 7 1 2 1 Protective function 2 15 2 7 1 2 2 Power save mode 2 15 2 8 ENGINE CONTROL SYSTEM 2 15 2 8 1 DC Controller 2 15 2 8 1 1 Outline 2 15 2 8 1 2 Motor control 2 16 2 8 1 3 Safety 2 17 2 8 2 Main Controller 2 17 2 8 ...

Page 27: ...the power switch is turned off Maintains the printer in printable condition The printer performs the following during this period Enters Sleep mode when the main controller sends a sleep command Completes any required calibration such as color misregistration control and image stabilization control when the main controller sends a command INTR Initial rotation period From the time the print comman...

Page 28: ...Fault Detection 0018 6527 LBP5050N LBP5050 1 Scanner motor failure The scanner motor does not reach a specified rotation within a specified period after starting up the laser scanner motor The rotation of the scanner motor is out of specified range for a specified period during scanner motor drive 2 BD failure The BD interval is detected at out of a specified value during a print operation Scaner ...

Page 29: ...the print media through the ITB and fixed F 2 3 2 4 1 2 Image formation Process 0018 6675 LBP5050N LBP5050 The image formation process consists of the following nine steps divided among six functional blocks Block 1 Latent image formation Step 1 Primary charging Step 2 Laser beam exposure Block 2 Development Step 3 Development Block 3 Transfer Step 4 Primary transfer Step 5 Secondary transfer Step...

Page 30: ...he drum surface F 2 5 Step 2 Laser beam exposure The laser beam scans the photosensitive drum to neutralize the negative charge on portions of the drum surface An electrostatic latent image forms where the negative charge was neutralized F 2 6 2 4 1 4 Development block 0018 6681 LBP5050N LBP5050 Latent image formation Transfer Fixing Development Pickup Registration 5 Secondary transfer 6 Separatio...

Page 31: ...ensitive drum is transferred to the ITB The DC positive bias is applied to the primary transfer pad The negatively charged toner transfers to the ITB from the drum surface F 2 8 Step 5 Secondary transfer The toner image on the ITB is transferred to the print media The DC positive bias is applied to the secondary transfer roller As the media passes between the secondary transfer roller and the ITB ...

Page 32: ...eaning block 0018 6685 LBP5050N LBP5050 The residual waste toner is cleared from the ITB surface Step 8 ITB cleaning The ITB cleaning roller and the cleaning brush are applied with DC positive bias to charge the residual toner positive As the primary transfer pad is also applied with DC positive bias the positively charged residual toner is reverse transferred to the photosensitive drum from the I...

Page 33: ...ne 0018 6513 LBP5050N LBP5050 The high voltage power supply generates the high voltage biases that are applied to the primary charging roller developing roller primary transfer pad secondary transfer roller and ITB cleaning unit The DC controller controls the high voltage power supply to generate high voltage biases ITB cleaning brush Sweeper strip ITB cleaning roller ITB DC bias DC bias Partition...

Page 34: ...ty detection pattern made on the ITB 2 According to the measured density of each pattern controls the primary charge bias and developing bias to get the appropriate density The following is the conditions that trigger the image density correction control When the power is ON When replacing the toner cartridge After replacing the toner cartridge when the number of print exceeds the specified number...

Page 35: ...photosensitive drum only when required preventing a deterioration of the drums and making maximum use of the life The engagement disengagement of the developing roller is controlled by the DC controller rotating the main motor and changing the direction of the developing disengagement cam The DC controller controls the developing roller state whether engaged or disengaged by counting the main moto...

Page 36: ...r Fixing motor Solenoid Cassette pickup solenoid Sensor Cassette media presence sensor Top of page sensor Loop sensor Manual feed slot media presence sensor Manual feed slot top of page sensor Fixing delivery sensor F 2 16 T 2 3 Description Signal Driver Main motor M701 MAIN MOTOR DRIVE signal DC controller Pickup motor M702 PICKUP MOTOR DRIVE signal DC controller Fixing motor M703 FIXING MOTOR DR...

Page 37: ...tionary Jam 0019 1713 LBP5050N LBP5050 The fixing delivery sensor cannot detect the trailing edge of paper within 4 5 sec after the paper leading edge sensor detects the trailing edge of paper 2 5 2 4 Other Jams 2 5 2 4 1 Fixing winding JAM 0019 1716 LBP5050N LBP5050 In case that the sensor turns OFF by the time that the fixing residual detection start after the fixing delivery sensor detects the ...

Page 38: ...roller is limited its rotational force and it does not rotate with such weak driving force from the pickup roller As the separation roller does not rotate the multiple sheets are not fed to the printer F 2 17 2 6 FIXING UNIT SYSTEM 2 6 1 Overview Configuration 2 6 1 1 Outline 0018 6518 LBP5050N LBP5050 The fixing power supply controls the temperature in the fixing unit The printer uses an on deman...

Page 39: ...e DC controller monitors the FIXING HEATER TEMPERATURE MAINTH signal and sends the FIXING HEATER DRIVE FSRD FSRD signals ac cording to the detected temperature The fixing heater drive circuit controls the fixing heater depending on the signals so that the heater remains at the targeted temperature 1 Warm up temperature control This control is to warm up the fixing heater until the fixing temperatu...

Page 40: ... of a fixing unit failure when it encounters the following conditions 1 Start up failure If the detected temperature of the thermistor does not reach 40 deg C within a specified period from the heater energization during the wait period If the detected temperature of the thermistor does not reach 70 deg C within a specified period after it once reaches 40 deg C after the heater energization during...

Page 41: ...tch and unplug the AC power cord Do not turn the power switch on again until the root cause is found In addition two fuses in the fixing power supply protect against overcurrent If overcurrent flows into the AC line the fuses blow and cut off the AC power 2 7 1 2 2 Power save mode 0018 6517 LBP5050N LBP5050 The power save mode reduces power consumption of the printer When the low voltage power sup...

Page 42: ...r SR602 Top of page sensor SR603 Loop sensor SR604 Manual feed slot media presence sensor SR605 Manual feed slot top of page sensor SR606 Developing homeposition sensor SR607 Media width sensor R SR608 Media width sensor L SR609 Fixing delivery sensor SR610 Fixing pressure release sensor SR612 Front door open detection sensor SR613 Rear door open detection sensor Environment sensor Color misregist...

Page 43: ...ng environment To that end CPU is designed for the following The print data from the application is turned into dot data and sent to the printer without conversion into the printer s page description language PDL The printing environment may be checked and set on the host computer display by responding to dialog boxes The printer status is indicated on the host computer screen print end time print...

Page 44: ...RAM Retains image data IC11 Flash ROM Network system order firmware storage IC12 SDRAM Retains image data IC2S NVRAM Serves to retain image data CPU IC5 CPU IC3 ASIC IC6 MEMC DC controller PCB NW I F 4Kbit NVRAM IC2S NIC I F Connector USB Connector USB2 0 S L I M P W M Control system Control system Video K Video C Video Y Video M J2 J1 J6 16MB SDRAM IC7 TRANSCEIVER IC ASIC IC1 8MB SDRAM IC12 2MB F...

Page 45: ...Chapter 3 DISASSEMBLY AND ASSEMBLY ...

Page 46: ......

Page 47: ...oving the Main Motor 3 8 3 1 11 Operation Panel Unit 3 9 3 1 11 1 Before Removing the Control Panel 3 9 3 1 11 2 Removing the Control Panel 3 9 3 1 12 DC Controller PCB 3 10 3 1 12 1 Before Removing the DC Controller PCB 3 10 3 1 12 2 Removing the DC Controller PCB 3 10 3 1 12 3 After Replacing the DC controller PCB 3 10 3 1 13 Main Controller PCB 3 10 3 1 13 1 Before Removing the Main Controller ...

Page 48: ...eparation Roller 3 18 3 5 FIXING SYSTEM 3 19 3 5 1 Fixing Assembly 3 19 3 5 1 1 Before Removing the Fixing Assembly 3 19 3 5 1 2 Removing the Fixing Assembly 3 19 3 5 2 Fixing Film Unit 3 20 3 5 2 1 Before Removing the Fixing Film Unit 3 20 3 5 2 2 Removing the Fixing Film Unit 3 20 3 5 3 Fixing Pressure Roller 3 21 3 5 3 1 Before Removing the Fixing Pressure Roller 3 21 3 5 3 2 Removing the Fixin...

Page 49: ...e lower rear cover 2 and the rear door 3 F 3 2 3 1 2 Rear Side Cover 3 1 2 1 Before Removing the Rear Side Cover 0018 7852 LBP5050N LBP5050 1 Remove the right cover page 3 2 Removing the Right Cover 3 1 2 2 Removing the Rear Side Cover 0018 7853 LBP5050N LBP5050 1 Open the rear door 1 F 3 3 2 Free the 2 claws 1 and remove the rear side cover 2 F 3 4 3 1 3 Rear Upper Cover 3 1 3 1 Before Removing t...

Page 50: ... pickup slot cover 1 F 3 7 3 Remove the screw 1 F 3 8 4 Free the 9 claws 1 and open the right cover 2 in the direction of the ar row 5 Free the claw 3 and remove the right cover 2 F 3 9 3 1 5 Left Cover 3 1 5 1 Removing the Left Cover 0018 7066 LBP5050N LBP5050 1 Remove the cassette 1 F 3 10 2 Remove the screw 1 F 3 11 1 2 1 1 1 1 2 1 1 1 3 1 1 ...

Page 51: ...t cover page 3 2 Removing the Left Cover 3 Remove the rear side cover page 3 1 Removing the Rear Side Cover 4 Remove the upper rear cover page 3 1 Removing the Upper Rear Cover 3 1 6 2 Removing the Upper Cover Assembly 0018 7083 LBP5050N LBP5050 1 Remove the upper cover assembly 1 1 flat cable 2 1 screw 3 4 claws 4 F 3 13 2 Remove the control panel 1 from the upper cover assembly 1 harness guide 2...

Page 52: ...row C and remove the left stopper 6 in the direction of the arrow D while pushing the left corner 5 of the upper cover assembly F 3 18 6 Remove the cartridge tray 1 F 3 19 7 Close the front door 1 F 3 20 8 Open the manual pickup slot cover 1 in the direction of the arrow A 9 Open the manual pickup tray assembly 2 in the direction of the arrow B F 3 21 10 Free the 3 claws 1 and lift the paper pass ...

Page 53: ...right arm in the direction of the arrow A and lift the right arm 2 in the direction of the arrow B 18 Remove the shaft 3 of the left arm in the direction of the arrow C and lift the left arm 4 in the direction of the arrow D F 3 28 19 Remove the shaft 1 of the front door and remove the front door 2 F 3 29 3 1 8 Main Drive Unit 3 1 8 1 Before Removing the Main Drive Assembly 0018 7639 LBP5050N LBP5...

Page 54: ...ller PCB 3 1 8 2 Removing the Main Drive Assembly 0018 7648 LBP5050N LBP5050 1 Pull out the cartridge tray fully 2 Remove the harness guide 1 in the direction of the arrow Harness 2 1 claw 3 F 3 30 3 Remove the ITB fixing holder 1 1 screw 2 F 3 31 4 Remove the harness guide 1 1 connector 2 Harness 3 2 claws 4 F 3 32 5 Remove the plate 1 2 screws 2 F 3 33 6 Free the flat cable 1 and the 2 harnesses...

Page 55: ... 2 1 Points to Note at Installation Check to see that hook 2 of the gear 1 of the sub drive assembly is situated at the correct position as shown in the following figure If it is not situated at the correct position rotate the gear 1 in the direction of the arrow to adjust the hook 2 to the correct position Check to see that the ITB link assembly 2 of the main drive assembly 1 is set to the correc...

Page 56: ...ng the DC Con troller PCB 10 Remove the main drive assembly page 3 6 Removing the Main Drive Assembly 3 1 9 2 Removing the Sub Drive Assembly 0018 8335 LBP5050N LBP5050 1 Remove the sub drive assembly cover 1 2 screws 2 F 3 38 2 Remove the sub drive assembly 1 2 screws 2 F 3 39 3 1 10 Main Motor 3 1 10 1 Before Removing the Main Motor 0018 7822 LBP5050N LBP5050 1 Remove the right cover page 3 2 Re...

Page 57: ...ove the right cover page 3 2 Removing the Right Cover 2 Remove the left cover page 3 2 Removing the Left Cover 3 Remove the rear side cover page 3 1 Removing the Rear Side Cover 4 Remove the upper rear cover page 3 1 Removing the Upper Rear Cover 5 Remove the upper cover assembly page 3 3 Removing the Upper Cover Assembly 3 1 11 2 Removing the Control Panel 0018 7091 LBP5050N LBP5050 1 Remove the ...

Page 58: ...RAM on the main controller PCB Executing Printer Setting Restoration in service mode recovers the backup data in the NVRAM on the DC controller PCB When replacing the DC controller PCB execute recovery of backup data color displacement correction and calibration in service mode 1 Execute Option Menu Service Mode Printer Information settings Printer Setting Restoration T 3 1 2 Turn off on the power...

Page 59: ...he status window T 3 2 3 1 14 Low Voltage Power Supply Assembly 3 1 14 1 Before Removing the Low Voltage Power Supply Assembly 0018 7561 LBP5050N LBP5050 1 Remove the right cover page 3 2 Removing the Right Cover 2 Remove the rear side cover page 3 1 Removing the Rear Side Cover 3 Remove the rear door page 3 1 Removing the Rear Door 4 Remove the main controller PCB page 3 11 Removing the Main Con ...

Page 60: ...ge 3 2 Removing the Left Cover 2 Remove the rear side cover page 3 1 Removing the Rear Side Cover 3 Remove the rear door page 3 1 Removing the Rear Door 3 1 15 2 Removing the Fixing Power Supply Assembly 0018 7855 LBP5050N LBP5050 1 Remove the fixing power supply cover 1 2 screws 2 F 3 54 2 Disconnect the 3 connectors 1 and free the harness 3 from the guide 2 F 3 55 3 Remove the harness guide 1 4 ...

Page 61: ... 3 58 3 Remove the sub PCB 1 1 screw 2 4 Free the harness 4 from the guide 3 F 3 59 5 Remove the high voltage power supply PCB 1 3 screws binding 2 1 screw w spring 3 7 claws 4 F 3 60 3 2 LASER EXPOSURE SYSTEM 3 2 1 Laser Scanner Unit 3 2 1 1 Before Removing the Laser Scanner Unit 0018 7546 LBP5050N LBP5050 1 Remove the right cover page 3 2 Removing the Right Cover 2 Remove the left cover page 3 2...

Page 62: ... arrow B and free the purple harness 3 from the guide F 3 62 6 Remove the sub drive assembly cover 1 2 screws 2 F 3 63 7 Free the left scanner fixing spring 1 from the hook 2 8 Free the right scanner fixing spring 3 from the hook 4 9 Remove the spring 6 from the sensor arm 5 F 3 64 10 Free the rear scanner fixing spring 1 from the hook 2 2 3 5 4 1 1 2 A 2 B 3 2 1 4 3 6 5 1 2 ...

Page 63: ...ver 1 F 3 67 How to transit to the service mode 1 After the power ON display the printer driver screen 2 Change the display from the driver screen to status window 3 Enter the password 28 with keyboards 4 Select Option menu Service mode Service parts replacement Scan ner unit replace settings from the status window F 3 68 3 3 IMAGE FORMATION SYSTEM 3 3 1 Intermediate Transfer Unit 3 3 1 1 Before R...

Page 64: ... upper cover assembly 4 Push the claw 4 in the direction of the arrow C and remove the left stopper 6 in the direction of the arrow D while pushing the left corner 5 of the upper cover assembly F 3 71 5 Remove the cartridge tray 1 F 3 72 6 Disconnect the connector 1 and free the harness 3 from the harness guide 2 F 3 73 7 Remove the ITB fixing holder 1 1 screw 2 F 3 74 8 Hold the ITB unit 1 as sho...

Page 65: ...or 1 disconnected in step 6 not be caught in the mouth 2 of the connector guide The ITB harness 1 may be caught inside of the host machine at the time of mounting the ITB unit Be sure to fix the ITB harness with a tape 2 as shown in the following figure and mount the ITB unit 2 2 1 2 1 1 When mounting the ITB unit be sure to route the ITB harness 1 through the mouth 2 of the guide and pull out the...

Page 66: ...r outlet 5 Stand the host machine with its rear side facing down 6 Open the 2 protrusions 1 of the holder in the direction of the arrow and remove the pickup roller assembly 2 F 3 79 3 4 2 Cassette Separation Roller 3 4 2 1 Removing the Separation Roller 0018 7596 LBP5050N LBP5050 1 Remove the cassette 1 F 3 80 2 Stand the host machine with its rear side facing down 3 Remove the 2 protrusions 1 an...

Page 67: ... page 3 2 Removing the Left Cover 3 Remove the rear side cover page 3 1 Removing the Rear Side Cover 4 Remove the upper rear cover page 3 1 Removing the Upper Rear Cover 5 Remove the upper cover assembly page 3 3 Removing the Upper Cover Assembly 6 Remove the Rear Door page 3 1 Removing the Rear Door 3 5 1 2 Removing the Fixing Assembly 0018 7138 LBP5050N LBP5050 1 Remove the high voltage cover 1 ...

Page 68: ... As sembly 3 5 2 2 Removing the Fixing Film Unit 0018 7538 LBP5050N LBP5050 1 Remove the right fixing pressure plate 1 1 spring retainer holder 2 1 spring 3 2 Remove the left fixing pressure plate 4 1 spring retainer holder 5 1 spring 6 F 3 86 3 Remove the guide retaining plate 1 2 screws 2 F 3 87 4 Remove the claw 1 of the gear pull out the shaft unit 2 in the direction of the arrow and remove th...

Page 69: ...ving the Upper Cover Assembly 6 Remove the Rear Door page 3 1 Removing the Rear Door 7 Remove the Fixing Assembly page 3 19 Removing the Fixing As sembly 8 Remove the Fixing Film Unit page 3 20 Removing the Fixing Film Unit 3 5 3 2 Removing the Fixing Pressure Roller 0018 7545 LBP5050N LBP5050 1 Remove the fixing pressure roller 1 1 bushing 2 1 bushing 3 1 gear 4 F 3 91 3 5 4 Fixing Motor 3 5 4 1 ...

Page 70: ...Chapter 3 3 22 F 3 92 2 Remove the fixing motor 1 1 connector 2 2 screws 3 F 3 93 1 2 1 2 3 3 ...

Page 71: ...Chapter 4 MAINTENANCE AND INSPECTION ...

Page 72: ......

Page 73: ...aced Parts 4 1 4 2 Consumables 4 1 4 2 1 Life Expectancy of Consumable Parts 4 1 4 3 Periodical Service 4 1 4 3 1 Periodic Service 4 1 4 4 Cleaning 4 1 4 4 1 Cleaning Point 4 1 4 4 2 Pickup Roller 4 1 4 4 3 Separation Roller 4 2 4 4 4 Front Fixing Guide 4 2 4 4 5 Feed Guide 4 2 ...

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Page 75: ...50 No consumable parts are required in this printer 4 3 Periodical Service 4 3 1 Periodic Service 0019 4166 LBP5050N LBP5050 The printer has no parts that require periodic servicing 4 4 Cleaning 4 4 1 Cleaning Point 0019 4170 LBP5050N LBP5050 F 4 1 4 4 2 Pickup Roller 0019 4171 LBP5050N LBP5050 Wipe with a lint free cloth If dirt cannot be removed dampen the lint free cloth with alcohol 1 Pickup r...

Page 76: ...ampen the lint free cloth with alcohol 4 4 4 Front Fixing Guide 0019 4173 LBP5050N LBP5050 Wipe with a lint free cloth If dirt cannot be removed dampen the lint free cloth with alcohol 4 4 5 Feed Guide 0019 4174 LBP5050N LBP5050 Wipe with a lint free cloth If dirt cannot be removed dampen the lint free cloth with alcohol ...

Page 77: ...Chapter 5 TROUBLESHOOTING ...

Page 78: ......

Page 79: ...g the Main Controller PCB 5 1 5 1 4 Adjustment of Fixing System 5 2 5 1 4 1 Nip width specifications 5 2 5 2 SERVICE TOOLS 5 3 5 2 1 Standard Tools 5 3 5 2 2 Solvents and Oils 5 3 5 3 ERROR CODE 5 3 5 3 1 Error code 5 3 5 4 Version Up 5 6 5 4 1 Outline 5 6 5 4 1 1 Overview of Version Upgrading 5 6 5 5 Service Mode 5 6 5 5 1 Outline 5 6 5 5 1 1 Outline 5 6 5 5 2 Service Mode Table 5 7 5 5 2 1 Servi...

Page 80: ......

Page 81: ...ent of Electrical Components 5 1 3 1 After Replacing the DC controller PCB 0019 4180 LBP5050N LBP5050 The information in the NVRAM on the DC controller PCB is saved as back up data in the NVRAM on the main controller PCB Executing Printer Setting Restoration in service mode recovers the backup data in the NVRAM on the DC controller PCB When replacing the DC controller PCB execute recovery of backu...

Page 82: ... Print a blank page from an external device 4 Open the front door after 25 seconds Wait for over 10 seconds and re move the paper from the printer 5 Measure the width of the glossy band across the paper and check if it meets the requirements below Center a 6 0 1mm Side b c 5 0 to 7 5mm Right Left asymmetry b c 1 0mm or less F 5 4 The information in the NVRAM on the DC controller PCB is saved in th...

Page 83: ...t 11 12 13 14 15 Allen wrench set File fine Allen hex screwdriver Diagonal cutting pliers Needle nose pliers CK 0151 CK 0161 CK 0170 CK 0201 CK 0202 5 piece set M4 Length 107 mm 16 17 18 19 20 Pliers Retaining ring pliers Crimper Tweezers Ruler CK 0203 CK 0205 CK 0218 CK 0302 CK 0303 Applied to the axis ring Employed to measure 150 mm 21 22 23 24 25 Mallet plastic head Brush Penlight Plastic bottl...

Page 84: ...he connector of the fixing power supply unit DC controller PCB fixing power supply unit Replace the low voltage power supply PCB E012 Motor startup abnormality 0000 Description ITB motor speed detection signal frequency does not reach specified frequency after starting to drive the ITB motor Cause ITB motor defect DC controller PCB defect Check the connector of the ITB motor DC controller PCB Repl...

Page 85: ...r PCB defect Check the connector of the ITB unit DC controller PCB Replace ITB unit Replace DC controller PCB E100 Scanner unit laser unit BD abnormality 0000 Description Yellow optical assembly failure Cause Laser scanner defect DC controller PCB defect Check the connector of the laser scanner unit DC controller PCB Replace laser scanner unit Replace DC controller PCB 0001 Description Magenta opt...

Page 86: ...he keyboard to add a special menu to the Printer Status Window screen Starting Service Mode 1 Turn on the power so that the Printer Driver screen appears 2 On the Drive screen bring up the Status window 1 3 Enter the appropriate password 28 from the keyboard 4 See that service mode 2 has appeared on the Option menu of the Status Window screen F 5 5 Description EEPROM error Cause Main controller PC...

Page 87: ... the setting value Effective for images with toner spatter water droplets Decreasing the setting value Effective for images with white marks white blotches rough textured half tones front side 5 to 5 0 back side 5 to 5 0 Developing bias Use this to specify the offset value for developing bias Increasing the setting value Effective for images with foggy image Decreasing the setting value Effective ...

Page 88: ...ackup the NVRAN value of to NVRAM of main controller manually EEPROM CPR Information reset When replacing DC controller PCB use this to clear the registration value for horizontal scanning direction stored in NVRAM Replace service parts Scanner unit replacement settings When replacing the laser scanner use this to enter the setting value into NVRAM of DC controller PCB HP setting for pickup roller...

Page 89: ...Chapter 5 5 9 F 5 9 F 5 10 5 5 2 3 Service Chart Print 2 0019 0672 LBP5050N LBP5050 Use Service Chart Print 2 to check image density and color tint ...

Page 90: ...Chapter 5 5 10 F 5 11 F 5 12 ...

Page 91: ...Chapter 5 5 11 F 5 13 F 5 14 ...

Page 92: ...Chapter 5 5 12 F 5 15 F 5 16 5 5 2 4 Status Print B 0019 0674 LBP5050N LBP5050 In Status Print B calibration logs are provided with the Status Print of the Utility menu in the Status window ...

Page 93: ...Chapter 5 5 13 00 Cyan 01 Magenta 02 Yellow 03 black F 5 17 ...

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Page 95: ...Chapter 6 APPENDIX ...

Page 96: ......

Page 97: ...tents Contents 6 1 OUTLINE OF ELECTRICAL COMPONENTS 6 1 6 1 1 Clutch Solenoid 6 1 6 1 1 1 Solenoid 6 1 6 1 2 Motor 6 1 6 1 2 1 Motor 6 1 6 1 3 Sensor 6 2 6 1 3 1 Sensor 6 2 6 1 4 PCBs 6 3 6 1 4 1 PCBs 6 3 ...

Page 98: ......

Page 99: ...ICAL COMPONENTS 6 1 1 Clutch Solenoid 6 1 1 1 Solenoid 0020 1967 LBP5050N LBP5050 F 6 1 6 1 2 Motor 6 1 2 1 Motor 0019 4300 LBP5050N LBP5050 Ref Notation Name 1 SL706 Developing disengagement solenoid 2 SL705 Cassette pickup solenoid 1 2 ...

Page 100: ...Sensor 0020 1968 LBP5050N LBP5050 F 6 3 Ref Notation Name 1 M701 Main motor 2 M703 Fixing motor 3 M702 Pickup motor Ref Notation Name Ref Notation Name 1 SR606 Developing homeposition sensor 2 SR603 Loop sensor 1 2 3 1 2 3 4 5 6 7 8 9 10 11 12 ...

Page 101: ... SR613 Rear door open detection sensor 8 SR602 Top of page sensor 9 SR601 Cassette paper presence sensor 10 SR612 Front door open detection sensor 11 SR605 Manual feed top of page sensor 12 SR604 Manual feed paper presence sensor Ref Name 1 DC controller PCB 2 low voltage power supply PCB 3 Fixing Power Supply 4 High voltage power supply PCB 5 Main controller PCB Ref Notation Name Ref Notation Nam...

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Page 103: ...Aug 13 2008 ...

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