OKI PCB UMMB-2 MAIN CONTROLLER ML380

Engineered around a dedicated printer controller IC, the OKI UMMB-2 main controller board is the central nervous system of the ML380 dot matrix printer, orchestrating data processing, motor control, and interface communication with precision. Built on a robust FR-4 composite epoxy substrate, this PCB ensures reliable operation in demanding office and industrial environments.

Overview

The UMMB-2 is a genuine OKI replacement part, pre-loaded with the ML380 operating firmware and ready for immediate installation. It manages all core printer functions, including print head firing, carriage movement, paper feed, and communication through parallel, serial, or USB interfaces depending on the printer configuration. The board features onboard ROM and RAM for firmware execution and data buffering, along with internal ribbon cable connectors and a power input from the printer's PSU.

What stands out

• Direct replacement for the original OKI ML380 main board, ensuring perfect compatibility and fit.
• Integrated printer controller IC handles all logic operations without external processing.
• Supports multiple communication interfaces (parallel, serial, USB) for flexible connectivity.
• Pre-loaded with OKI ML380 firmware, eliminating the need for programming or configuration.
• High-quality FR-4 material provides excellent thermal and mechanical stability.
• Standard screw-in mounting for secure installation inside the printer chassis.

Technical details

• Board type: Main controller board / logic board
• Compatibility: OKI ML380 dot matrix printer
• Part number: UMMB-2
• Material: FR-4 (Flame Retardant 4) composite epoxy
• Input voltage: 5V/3.3V logic (powered by printer's PSU)
• Memory: Onboard firmware ROM and RAM
• Connectivity: Internal ribbon cable connectors, power input, data interfaces
• Mounting type: Screw-in
• Condition: New

Our verdict

Restore your OKI ML380 to full functionality with this authentic main controller board. Its exact fit, pre-loaded firmware, and robust construction make it the ideal choice for professional repair and maintenance.