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LEXMARK T640, T642, and T644 Service Manual and Parts Manual

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LEXMARK T640, T642, and T644 Service Manual and Parts Manual


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SKU: 9340 Categories: Lexmark, Manuals Tags: T640, T642, T644



Laser Notices

Safety Information


General Information
Maintenance approach
Media specifications
Tools required

Diagnostic information
Power-On Self Test (POST) sequence
Symptom tables
Messages and error codes
Service checks

Diagnostic aids
Accessing service menus
Diagnostics mode
Configuration menu (CONFIG MENU)
Additional useful menu locations
Print quality troubleshooting
Paper feed jams

Repair information 
Handling ESD-sensitive parts
Adjustment procedures
Removal procedures

Connector locations and connections

Preventive maintenance
Safety inspection guide
Lubrication specifications
Scheduled maintenance

Parts catalog
How to use this parts catalog
Assembly 1: Covers
Assembly 2: Frame 1
Assembly 3: Frame 2
Assembly 4: Frame 3
Assembly 5: Printhead
Assembly 6: Paper feed—autocompensator
Assembly 7: Paper feed—multipurpose feeder
Assembly 8: Paper feed—alignment
Assembly 9: Integrated 250-sheet paper tray
Assembly 10: Integrated 500-sheet paper tray
Assembly 11: Drives—Main drive and developer drive
Assembly 12: Hot roll fuser
Assembly 13: Transfer/charging
Assembly 14: Electronics—power supplies
Assembly 15: Electronics—card assemblies
Assembly 16: Electronics—shields
Assembly 17: Cabling diagrams 1
Assembly 18: Cabling diagrams 2
Assembly 19: Cabling diagrams 3
Assembly 20: Cabling diagrams 4
Assembly 21: Cabling diagrams 5
Assembly 22: Optional 250-sheet paper drawer
Assembly 23: Optional 250-sheet paper tray
Assembly 24: Optional 500-sheet paper drawer
Assembly 25: Optional 500-sheet paper tray
Assembly 26: Duplex option
Assembly 27: Envelope feeder
Assembly 28: Output expander 1
Assembly 29: Output expander 2
Assembly 30: High-capacity output expander 1
Assembly 31: High-capacity output expander 2
Assembly 32: High-capacity output expander 3
Assembly 33: 5-bin mailbox 1
Assembly 34: 5-bin mailbox 2
Assembly 35: High-capacity feeder 1
Assembly 36: High-capacity feeder 2
Assembly 37: High-capacity feeder 3
Assembly 38: High-capacity feeder 4
Assembly 39: Kiosk—vertical and horizontal paper adapters
Assembly 40: StapleSmart finisher I
Assembly 41: StapleSmart finisher 2
Assembly 42: StapleSmart finisher 3
Assembly 43: StapleSmart finisher 4
Assembly 44: Options

Appendix A—Options and features 
Installing input options
Installing memory or option cards
Accessing the printer system board
Removing or installing a memory card
Removing or installing a flash memory or firmware card
Installing an option card
Replacing the shield
Printing and using features
Linking trays


Part number index

Copier Lease Request

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Service Request

Quality and Affordable Service, Repair, and Maintenance for Your Copiers and Printers

Your business productivity is important to us, which is why we provide a hassle-free and affordable service for all models of copiers and printers in any condition. We offer great value for the money when it comes to our repair and maintenance services.

  • Factory certified and highly qualified service technicians
  • A highly trained service technician onsite within 24-48 hours
  • Affordable rates starting at $85/hour
  • High inventory of repair and replacement parts for most copier and printer brands

We are a one-stop shop for all your copier and printer repair and maintenance needs. 70% of our service requests are resolved on the 1st visit. You are guaranteed prompt and quality service wherever you are in the US.

For fast, reliable, and quality maintenance and repair for your copiers and printers, the choice is clear: Clear Choice Technical Services!

For an accurate diagnosis and a faster transaction time, please fill out the form below.

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Remote Computer/Copier/Printer Support

Remote Support Information

*Copier and Printer

We typically connect to your computer, which should be on the same network as the copier. This allows us to access the copier's Web Interface for more effective troubleshooting and to adjust any settings that may require modification or configuration.


We will explore various troubleshooting steps, and if the issue is related to the network, we may discuss it over the phone without remote access until we resolve the problem.

Machine Capability

Please confirm if your copier can still copy or print standalone (e.g., without any computer or network connection) to ensure we address your issue effectively. Complete this questionnaire to the best of your ability, and we will get back to you promptly to schedule remote support. Thank you for choosing our services, and we look forward to assisting you.

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Maintenance Contract

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