Lexmark C910 Color Printer Service Manual, 2001 (P/N 12G9081)

This 2001 Lexmark factory service manual (P/N 12G9081) covers the C910 Color Printer (5055-01x), including the base printer, optional expansion paper feeders, duplex unit, and high-capacity paper feeder (HCPF).

Search, Bookmarks, and PDF Pages

Text and diagram navigation: Search the manual text or use the embedded bookmarks to jump to diagnostics, repair procedures, component locations, and the parts catalog. Some connector and sensor labels are part of the drawings and are easiest to read when zoomed in.

One printable PDF contains 323 pages, including 13 pages of front matter, 300 pages across the service chapters, and a 10-page index.

Paper Feed, Print Defects, and LED Printhead Service

These selected service topics cover the main repair areas. The manual also includes an operator-panel menu map and installation environment checks.

• Print engine: Explains four-color LED electrophotography, including toner and photodeveloper operation, transfer-belt control, drum cleaning, fusing, and face-up or face-down delivery.
• Fault isolation: Service-error tables, a symptom table, and 11 Maintenance Analysis Procedures cover drive faults, paper jams, false sensor messages, and installed options.
• Diagnostic mode: Covers the power-on self-test, diagnostic print pages, LCD and button tests, memory checks, serial and parallel wrap tests, and the error log.
• Assembly removal: Ninety procedures cover printheads, controller boards, the RIP box, power supplies, motors, fans, the transfer belt, fuser, and optional paper-handling assemblies.
• Parts and maintenance: An exploded catalog covers 23 assemblies. Maintenance references identify belt and fuser kits, periodic cleaning points, lubricants, and cleaners.

Lexmark prepared this manual for professional service personnel. High-voltage assemblies, the hot fuser, moving drive parts, and ESD-sensitive boards require the precautions described in the manual.

Paper Path and Feeder Checks

Jam diagnosis follows the sheet from the cassette or multipurpose feeder through registration, separation, fusing, and exit. The duplex section explains side-fence correction and refeed. The print-mode section covers monochrome and color operation, transparencies, thick stock, envelopes, and postcards.

For the HCPF, the manual explains the feed and separation mechanism, tray lift, paper-size detection, and remaining-paper sensing. A stand-alone feed test and board LED checks help distinguish a feed-mechanism fault from a sensor or switch fault.

Electrical Faults and Print Defects

The service checks pair connector-level voltage and continuity tests with board-location drawings. For example, the paper-exit check distinguishes a sensor fault from a problem with the deflector or its solenoid. The electrical references cover connector and component locations and support field-replaceable-unit diagnosis.

Print-quality troubleshooting covers blank or black pages, missing colors, streaks, uneven density, white spots, poor fusing, toner on the back of the sheet, skew, and color misregistration. The repeat-defect chart links mark spacing to likely rollers, drums, developer components, or the transfer belt, helping narrow the inspection before a part is replaced.

Options diagnostics cover DRAM, flash memory, one hard-disk option, serial and parallel ports, and network hardware. The serial wrap test identifies test plug 1329048 and helps isolate the printer port from the external cable and host. The Quick Disk Test preserves data. The separate Disk Test/Clean procedure erases it.

Alignment and Setup After Replacement

The manual identifies when to check X, Y, and theta registration after transfer-belt, printhead, or controller work. LED printhead replacement calls for the matching EEPROM and a light-quantity setting. The removal procedure cautions that disturbing the printhead locating nuts can defocus the image.

The controller and EPROM sections explain when to transfer existing components, check counters, or restore the Configuration ID. The Drive 1 gear unit is factory-phased and is serviced as an assembly.

Parts Drawings and Preventive Maintenance

The Covers Diagram and Major Parts Diagram show where assemblies sit. The HCPF electrical and drive layouts and the sensor and switch drawings help match a service check to the hardware. Exploded views and part numbers distinguish assemblies such as the I/F controller, fuser, duplex unit, and the six HCPF groups, including voltage-specific replacement parts where listed.

Sample Fuser Mark Spacing and Feeder Belt Setting

The repeat-defect table associates marks spaced 139.2 mm apart with the upper fuser roller and marks spaced 140 mm apart with the lower roller.

The HCPF timing-belt procedure specifies a 6 ± 1 mm adjusting-screw setting for both the front and rear adjustments.