HP ASSY-DEVELOPING GEAR

Worn or damaged developing gears in HP LaserJet printers can cause uneven toner distribution, streaking, and poor print quality. This HP developing gear assembly (RM2-1258-010CN) restores the precise mechanical drive needed for consistent, professional output. It replaces the original gear train in the developing unit, ensuring the developing roller rotates smoothly and toner transfers evenly to the drum. Compatible with HP LaserJet 4200, 4250, 4300, and 4350 series printers, this assembly is engineered to OEM specifications for reliable performance and long service life.

Who is it for

This part is intended for service technicians, IT administrators, and advanced users who maintain HP LaserJet printers in offices, workgroups, or print rooms. If your printer shows signs of gear wear—grinding noises, toner smudges, or frequent paper jams near the toner cartridge—this assembly provides a cost-effective repair alternative to replacing the entire printer.

Main features

• Direct replacement for HP part number RM1-0036-000CN; also cross-referenced as RM2-1258-010CN.
• Precision-molded, high-strength plastic gears ensure smooth, quiet operation and accurate toner metering.
• Multi-gear design drives the developing roller and toner transfer mechanism for uniform print density.
• Compatible with HP LaserJet 4200, 4250, 4300, and 4350 series printers (laser technology).
• New, bulk-packaged service part—never used or refurbished.
• Professional installation recommended to ensure correct alignment and longevity.

Specifications

• Brand: HP
• Model: RM2-1258-010CN
• MPN: RM2-1258-010CN
• OEM code: RM1-0036-000CN
• Product type: Developing gear assembly
• Compatibility: HP LaserJet 4200, 4250, 4300, 4350 series
• Material: Durable high-strength plastic
• Number of gears: Multi-gear assembly
• Colour: Multi-colour (black, white, grey)
• Condition: New
• Packaging type: Bulk (service part)

Tips

Before installation, power off the printer and unplug it. Refer to the service manual for your specific LaserJet model to access the developing unit. Inspect surrounding gears for wear and replace if necessary. After installation, run a test print to verify even toner coverage. Store the assembly in a cool, dry place away from direct sunlight to prevent plastic degradation.