Kronos 6600186-999 System 400 Ethernet Main Board 460F Time Clock Rev B

Kronos 6600186-999 System 400 Ethernet Main Board 460F Time Clock Rev B

The Kronos 6600186-999 is the System 400 Ethernet Main Board for the Kronos 460F Time Clock Terminal. This is the central processing and communications PCB that drives the terminal — handling timekeeping logic, employee badge reads, and network communication for the 460F workforce data collection terminal. The board carries part numbers 6600186-999 and 6500186-001 and is marked Rev B, Made in the USA by Kronos Inc.

Specifications & What's Included

• Manufacturer Part Number: 6600186-999
• Secondary / PCB Part Number: 6500186-001 Rev B
• Board Revision: Rev B
• Compatible Terminal: Kronos System 400 / 460F Time Clock Terminal
• Main Processor: Motorola MC68EC000FN8 (68000-family CPU, visible on board)
• Serial DUART Controller: Zilog Z80 68C681CP (visible on board)
• Firmware ROM 1: 6700377-001, KOS.3C00 Rev A
• Firmware ROM 2: 6700375-001, 400.6A00 Rev A
• Sub-board assembly: 312-001 RA (mounted on main PCB)
• Communication interfaces: Ethernet, RS-232, RS-485/Modem (SW1 DIP-switch selectable)
• Terminal blocks: TB1 I/O, TB2 Communication, TB3 Battery Backup Board connections
• Power connector: DIN-style power input (labeled POWER on board)
• Green screw terminal blocks for I/O and communication wiring
• On-board lithium battery (battery backup for RTC/SRAM)
• Country of Manufacture: United States
• Item is board only — no enclosure or terminal housing included

Applications

The Kronos System 400 was a widely deployed workforce management terminal series used in manufacturing plants, distribution centers, hospitals, and large commercial facilities throughout the 1990s and into the 2000s. The 460F terminal was a badge-reading time clock that collected employee punch-in/punch-out data and transmitted it over a network to Kronos workforce management software running on a host system. The Ethernet Main Board is the core of the terminal — it runs the operating system, manages badge reader input, handles real-time clock functions, and provides the network link that makes automated time and attendance tracking possible. Replacement main boards are sought by facilities that still operate Kronos System 400 terminals, as well as by service organizations that repair and refurbish legacy Kronos equipment. The RS-232/RS-485/Modem switch-selectable serial interface also made these terminals compatible with a variety of host communication setups common in the era.