Printer Mainboard OKI 45724902 for OKI B412d/B412dn/B412dtn series

Replacement mainboard for OKI B412d, B412dn and B412dtn series printers. This printed circuit assembly is the central control board that manages communication between the printer’s interfaces, processes incoming print jobs, and coordinates mechanical and electronic subsystems to restore normal device operation after a board failure. The mainboard is compatible with the listed OKI models and intended to return original functionality when fitted according to manufacturer procedures.

Advantages

The mainboard restores full control-layer functionality, including job spooling, interface handling and status reporting, enabling the printer to resume reliable operation with original firmware and hardware compatibility. Using a direct replacement board avoids extended diagnostics of multiple subsystems and can be more time- and cost-effective than replacing the entire printer. The board is designed to match the physical connectors and mounting points of the OKI B412 series for straightforward installation by a qualified technician.

Suitable for

• Repairing OKI B412d, B412dn or B412dtn printers with board-level failure
• Service centers performing mainboard replacement and firmware restoration
• IT departments restoring networked monochrome printers in small offices
• Technicians replacing a defective logic board to recover device functionality

Key specifications

• Function: central control/main logic board for compatible OKI B412 series printers
• Interfaces: designed to support the original printer’s onboard communication ports and connectors
• Form factor: OEM-compatible board with factory mounting points and connector placements
• Compatibility: intended for use in specified OKI B412d, B412dn and B412dtn models
• Operation: handles print job processing, device status monitoring and subsystem coordination

How to use

Power off the printer and disconnect it from the mains before starting any repair. Remove the printer covers to access the internal electronics following the service manual instructions for the OKI B412 series. Carefully disconnect ribbon cables, connectors and any attached modules, noting their positions. Unfasten the mounting screws and extract the defective mainboard. Install the replacement board by aligning connectors and mounting points, secure with screws, reconnect all cabling, reinstall covers and power on. After installation, verify firmware version and device settings; if required, perform firmware reinstallation or configuration using the manufacturer’s tools to restore network and printing parameters.

Recommendations

Installation should be performed by a trained technician or service center familiar with OKI printers. Use antistatic handling precautions and follow the OKI service documentation. After replacement, run basic diagnostics and test pages to confirm functionality. If network or firmware issues persist, consult official OKI support for firmware images and configuration guidance.