LEXMARK OPTRA C720 SERVICE MANUAL

This service guide is a maintenance troubleshooting and instruction owner manual reference used for maintaining, disassembly and servicing the Lexmark Optra C720 printer. It provides comprehensive information on identifying Lexmark Optra C720 printer features, components, and spare parts troubleshooting printer problems and performing printer disassembly procedures.

Table contents of Lexmark Optra C720 Service Manual

• General Information
  Models ~ Standard Features ~ Tools Required For Service ~ Options ~ Operational Theory ~ Interlock Mechanism ~ Sheet Bypass Paper Feed Unit ~ Paper Feed Unit ~ Second Paper Feed Unit (Optional Paper Trays) ~ Drive Block ~ Contact Cam ~ Coupling Unit ~ Carriage Unit ~ Toner Cartridge Unit ~ Intermediate Transfer Unit ~ Fuser/Paper Exit Unit ~ Detecting New Cleaning Unit ~ Duplex Unit (Option)
• Diagnostic Information
  Start ~ Service Error Codes ~ User Status Messages ~ User Attendance Messages ~ Symptom Tables ~ Base Printer Symptom Table ~ Covers Interlock Symptom Table ~ Duplex Unit Symptom Table ~ Operator Panel Symptom Table ~ Paper Feed Symptom Table ~ Paper Tray Options Symptom Table ~ Power Symptom Table ~ Print Quality Symptom Table ~ Service Checks ~ Base Printer Service Checks ~ Bypass Tray (Multipurpose Tray) Service Check ~ Carriage Unit Service Check ~ Coupling Unit Service Check ~ Cover Interlock Service Check ~ Developer/Paper Feed Motor Service Check ~ Erase Lamp Service Check ~ Fuser Cold Service Check ~ Fuser Drive and Contact Cam System Service Check ~ Fuser Hot Service Check ~ High Voltage Leakage Detect Service Check ~ ITM Drive Service Check ~ Main Fan Service Check ~ New Toner Cartridge Detection Service Check ~ Operator Panel Service Check ~ Operator Panel Buttons Service Check ~ OPC Drive Service Check ~ Paper Exit Sensor Service Check ~ Paper Feed Service Check ~ Parallel Port Service Check ~ Power Service Check ~ Printhead Service Check ~ Print Quality Service Checks ~ Print Quality Initial Service Check ~ All Black or Color Page Service Check ~ All Blank Page Service Check ~ Background Service Check ~ Black, Color Lines or Bands Service Check ~ Black or Color Spots Service Check ~ Developer Drive System Service Check ~ Evenly Spaced Horizontal Lines/Marks Service Check ~ Foggy Background Service Check ~ Low Image Density Service Check ~ Offset Print Service Check ~ Poor Color Reproduction Service Check ~ Random Marks Service Check ~ Residual Image Service Check ~ Skew Service Check ~ Toner on Backside of Page Service Check ~ Uneven Print Density Service Check ~ White Lines or Bands Service Check ~ White Spots Service Check ~ White/Black Lines Service Check ~ Serial Port Service Check ~ Toner Level Detect Service Check ~ Toner Low/Empty Sensor Service Check ~ Transfer Roll Service Check ~ Tray 1 (Integrated Tray) Service Check ~ Options Service Checks ~ Flash Memory Option(s) Service Check ~ DRAM Memory Option(s) Service Check ~ Hard Disk Option Service Check ~ Network Card Option Service Check ~ 250/250 Dual Paper Tray Service Check ~ 250/250 Paper Tray Symptom Table ~ Duplex Unit Option Service Check
• Diagnostic Aids
  Print Quality Test Pages ~ Paper Jam Sequence ~ Disabling Download Emulations ~ Diagnostics Menu Structure ~ Diagnostic Mode ~ Print Registration ~ Print Tests ~ Print Quality Test Pages ~ Hardware Tests ~ LCD Test ~ Button Test ~ Parallel Wrap Test ~ ROM Memory Test ~ SDRAM Memory Test ~ Serial Wrap Test ~ Duplex Tests ~ Quick Test ~ Duplex Feed 1 ~ Duplex Feed 2 ~ Device Tests ~ Quick Disk Test ~ Disk Test/Clean ~ Flash Test ~ Printer Setup ~ Setting the Page Count ~ Viewing the Permanent Page Count ~ Serial Number ~ Setting Configuration ID ~ Laser Power ~ Parallel Strobe Adjustment ~ Error Log ~ Viewing the Error Log ~ Clearing the Error Log ~ Restore EP Factory Defaults ~ Exiting Diagnostic Mode
  
• Repair Information
  Handling ESD-Sensitive Parts ~ Cover Removals ~ Cartridge Cover Removal ~ Front Cover Removal ~ Fuser Cover Removal ~ Left Side Cover Removal ~ Operator Panel Cover Removal ~ Rear Cover Removal ~ Right Side Cover Removal ~ Top Cover Removal ~ Top (Small) Cover Removal ~ Right Side Removals ~ Carriage Drive Motor Removal ~ Coupling Drive Motor Removal ~ Developer Drive Motor Assembly Removal ~ Fuser Drive Motor Removal ~ OPC Drive Motor Removal ~ Cam Sensor Removal ~ LVPS Assembly Removal ~ Main Fan Removal ~ Main Fan Mounting Bracket Removal ~ Motor Mounting Stay C Assembly Removal ~ OPC Coupling Drive Block Assembly Removal ~ Solenoid Removal ~ Left Side Removals ~ Grid Block 1 Assembly Removal ~ Grid Block 2 Assembly Removal ~ Cable Cover 3 Removal ~ Cover Interlock Switch Removal ~ Micro Switch Removal ~ Electronics Removals ~ Controller Board Assembly Removal ~ Engine Board Assembly Removal ~ HVPS Board Assembly Removal ~ Interconnect Board Assembly Removal ~ On/Off Coupling Sensor Board Removal ~ Paper Sensor Board ~ Resist Sensor Board Removal ~ Waste Toner Board Assembly Removal ~ Fuser Unit ~ Fuser Unit Removal ~ Fuser Lamp Removal ~ Thermistor and Thermostat Removal ~ Main Body ~ Paper Feed Block Assembly Removal ~ Printhead Removal ~ Print Cartridge Carousel Removal ~ Carriage Home Position Sensor Removal ~ Registration Roll Removal
• Connector Locations
  Engine Board ~ LVPS (Low Voltage Power Supply) ~ Erase Lamp Board ~ TRAY 1 Sensor Board ~ TRAY 1 Registration Sensor Board ~ Waste Toner Sensor Board ~ Belt Position Sensor Board ~ Connector Locations for Options ~ 2nd Paper Option (250/250 Paper Option) ~ 2nd Paper Option (250/250 Paper Option) ~ LVPS (Internal 2nd Tray Option) ~ Duplex Unit Option ~ LVPS (Internal Automatic Duplex Option) ~ Electrical Components ~ Sensor/Switch Locations ~ Printer Circuit Board Locations ~ Fan/Motor Locations ~ Solenoid/Clutch Locations ~ 250/250 Paper Tray Option ~ Duplex Option ~ Cable Connections
• Preventive Maintenance
  Safety Inspection Guide ~ Service Precautions ~ Cleaning Procedures ~ Lubrication Specifications
• Parts Catalog
  How To Use The Parts Catalog ~ Assembly 1: Fuser ~ Assembly 2: Fuser ~ Assembly 3: Transfer ~ Assembly 4: Frames ~ Assembly 5: Frames Left Side ~ Assembly 6: Frames Right Side ~ Assembly 7: Frames Right Side 2 ~ Assembly 8: Frames Right Side 3 ~ Assembly 9: Carriage Block ~ Assembly 10: Base Frame ~ Assembly 11: Front Cover Assembly ~ Assembly 12: Front Cover Assembly 2 ~ Assembly 13: Feed Unit ~ Assembly 14: Laser Scanner Unit ~ Assembly 15: Cassette ~ Assembly 16: Upper Covers ~ Assembly 17: Covers ~ Assembly 18: Covers / Frame 250 Tray Option ~ Assembly 19: Middle Roll Unit 250 Tray Option ~ Assembly 20: 250/250 Tray Option Lower Unit ~ Assembly 21: Duplex Unit Option 2 ~ Assembly 22: Cassette Upper Section ~ Assembly 23: Cassette Rear Section 1 ~ Assembly 24: Cassette Rear Section 2 ~ Assembly 25: Duplex Option Lower Section 1 ~ Assembly 26: Duplex Option Lower Section 2 ~ Assembly 27: Duplex Option Lower Section 3 ~ Assembly 28: Cassette Lower Section 4 ~ Assembly 29: Duplex Option Lower Section 5 ~ Assembly 30: Miscellaneous
  
• Index
• Wiring Diagram

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